JP6615410B1 - Reservoir pond decontamination method including environmental measures - Google Patents

Abstract

Disclosed is a method for removing mud and soft soil in an endless track, particularly in decontamination work of soil layers such as rainwater control ponds and the like in which soil is contaminated at a high concentration by rainwater drainage containing radioactive substances. Contamination that does not cause a problem that even if excavation work is performed using a vehicle, the soil is not agitated, and the bottom of the pond is removed by removing the installed support pile, and the original function of the adjustment pond is not performed. Provide soil layer excavation method. SOLUTION: A support pile placing process for placing a support pile, a spread sheet laying process for laying a spread sheet, a drilling process, a spread sheet removing process, a drilling process after removing the spread sheet, and a pile head cutting process. The process is to construct the track of the tracked vehicle by repeating a series of steps in which the tracked vehicle transports the next floor plate and continuously constructs it on the laid plate and the support pile placing step. In the excavation process, excavation is performed while removing the floorboard, and in the pile head cutting process, means for cutting the pile head in accordance with the excavated surface after excavation is adopted. [Selection] Figure 1

Description

  The present invention relates to a method for removing contaminated soil in a basin, and in particular, in decontamination work such as in a regulating pond, preventing soil agitation due to an endless track of a tracked vehicle in soft land portions where water has been drawn. The basic method is to use the excavation method of contaminated soil layer, which conducts general excavation work, and in the water reservoir where water is accumulated, the agitation and separation method that sucks the bottom mud collected at the bottom together with the water and separates and collects the bottom mud The present invention relates to a reservoir pond comprehensive decontamination method that makes it possible to use a stirring and peeling type suction method using a stirring and peeling type suction system using a suction device.

  The Tohoku-Pacific Ocean Earthquake that occurred on March 11, 2011 caused damage to TEPCO's Fukushima Daiichi Nuclear Power Station, and a large amount of radioactive material was released into the environment. Contamination of the environment with radioactive materials and the resulting impact on human health or the living environment are feared, and it is an urgent task to quickly reduce these effects. Regulating ponds and ponds, etc. are used to temporarily collect rainwater that flows into rivers by local flooding such as torrential rain, reduce the burden on downstream rivers and sewer storm drains, or are agricultural irrigation facilities. Prior to this, it was thought that the amount of radiation in the regulating pond and reservoir would not directly affect citizens' lives, such as being surrounded by a fence so that ordinary people could not enter.

However, in rainwater control ponds where rainwater drainage collects, soil and fallen leaves accumulate, so radioactive substances concentrate (accumulate) there, and high concentrations of radioactive substances are observed. As many local governments have announced, there are places where the radiation dose measurement results of rainwater control ponds, reservoirs, or sewer management ponds etc. greatly exceed the radiation doses prescribed by each local government, and the Special Measures Law is Currently enacted, there are many cases where regulated ponds etc. are recognized as locally contaminated areas.
Such adjustment ponds are mud, soft, eutrophied humus soil, and because they contain a lot of water, if you bring a tracked vehicle such as a backhoe and excavate the soil, the soil is mixed in an endless track. A situation occurs. In addition, many stakes will be placed prior to laying the slats such as iron plates, but if the stakes are removed to remove the stakes after decontamination, the bottom of the pond will be pulled out, and the function of the regulating pond etc. There is a problem that it does not show.

  Thus, various techniques have been proposed in the past to solve such problems. Specifically, for example, a technique in which the name of the invention is “contaminated soil decontamination apparatus and decontamination method” has been disclosed and is known (see Patent Document 1). “It was easy to install and remove with a simple configuration, unmanned decontamination work, and to further expand the scope of decontamination of contaminated soil to the deep soil area. Specifically, decontamination equipment An electrode sheet laid on the surface, a plurality of electrode piles 3 penetrating through the electrode sheet and inserted into the soil of the decontamination target area, an osmotic solution penetrating into the contaminated soil, and stopping the diffusion of the osmotic solution in the contaminated soil The electrode sheet contains a conductive material and a pollutant adsorbent or a pollutant decomposer.The electrode pile communicates with the injection port and the discharge port, and the upper end bolt terminal is connected to the tip electrode part. Electrically conductive and provided with an insulating coating on the side surface excluding the tip, a pressing piece for pressing the electrode sheet through a rubber bush is projected at the upper end of the insulating coating, and a bolt terminal is provided. DC voltage is applied between the piles and the permeate diffuses And the contaminant contaminated soil to attract the electrokinetic phenomenon electrode sheet. "Is that. However, Patent Document 1 describes a decontamination method for contaminated soil, and the radioactive material can be recovered by removing the sheet-like electrode member. Although common in the advantage of no agitation and mixing, cesium has a high ionization tendency, so it is unlikely to exist as cesium alone in the environment, and it adheres to soil, trees, various structures, etc. as a compound. The absolute amount of soil that can be adsorbed to the electrode sheet for adsorbing to the electrode member is small, and removing the electrode piles may cause the bottom of the pond to bottom out Therefore, it is considered that the present invention is not suitable for decontamination of soil contaminated by empty ponds.

  Moreover, the technique which makes the name of invention "a topsoil transplanting construction method and a topsoil peeling mechanism" is disclosed, and it is a well-known technique (refer patent document 2). `` In the various civil engineering works, the challenge was to provide a topsoil transplanting method, topsoil transplanting tool and topsoil stripping mechanism that can be transferred as it is without destroying the natural environment and ecosystem of the topsoil. , Start to peel off the transplant area, dig up the required depth to form a topsoil step and place it to the required depth of the transplant area with a topsoil transplanter with the tip facing the topsoil step using appropriate means While maintaining the natural state without destroying the topsoil layer of the soil, it is inserted and peeled off, and then the topsoil transplanter is loaded as a transporter with the topsoil layer fully loaded and appropriately transported to the transplant destination. Then, lift the topsoil transplantation tool from the transporting means and bring it to the top of the transplantation site, then lower it to the transplantation site, and spread the topsoil layer on the transplantation ground to complete the transplantation Adoption of the characteristic configuration method to be Te. "Is that. However, it is considered that the invention described in Patent Document 2 may stir on an endless track of a tracked vehicle when dripping accumulated sediment.

  Moreover, the technique which makes the name of invention "the processing method of radioactive cesium containing soil" is disclosed, and it is a well-known technique (refer patent document 3). “I wanted to provide a method for treating radioactive cesium-containing soil that can improve the decontamination efficiency and reduce the amount of waste generated. Specifically, the specific gravity of soil containing radioactive cesium differs depending on the heavy liquid. A method of treating radioactive cesium-containing soil comprising a specific gravity separation step of separating into a plurality of types of soil and a cesium removal step of removing cesium contained in the soil separated by specific gravity. However, the invention described in Patent Document 3 describes a method for removing cesium contained in separated soil by separating the specific gravity using a heavy liquid, separating the layer into a layer having a high cesium concentration and a layer having a low cesium concentration. However, there is no description about the means for removing the separated soil, and there is no technique related to a construction method for laying a floor plate such as an iron plate for moving heavy machinery.

  In addition, as mentioned above, radioactive materials were released extensively due to the Fukushima Daiichi nuclear power plant accident caused by the Great East Japan Earthquake, and decontamination of these materials has become a major problem. It is transported to the bottom and deposited on the bottom while adsorbed by fine mud. Therefore, it is also important to collect and treat the bottom mud adsorbed with these radioactive substances for decontamination of lakes and the like.

  As a dredging device for bottom mud such as lakes and marshes, for example, the invention described in [Patent Document 4] below can be cited. In the invention described in [Patent Document 4], a base ship is floated on the surface of a lake, a suction body equipped with a suction pump is suspended from the base ship, and the bottom mud deposited on the bottom of the lake is sucked together with water. This is a technology that pumps to the land-side processing equipment. However, in many cases, dead plants are accumulated on the bottom of lakes and marshes, and the roots of aquatic plants and water-drawn plants are overgrown. In the suction body described in [Patent Document 4], these foreign substances enter the suction port. Clogging causes the suction capacity to deteriorate significantly. For this reason, it is necessary to periodically pull up the suction body to remove the foreign matter clogged in the suction port, and there is a problem that the working efficiency is extremely poor.

JP 2017-136515 A JP 2002-186314 A JP 2016-200337 A JP 2014-80797 A

In particular, the present invention is applicable to infinite decontamination of mud and soft soils that contain a lot of moisture in decontamination work of soil layers such as rainwater adjustment ponds and reservoirs in which soil is contaminated at high concentrations by rainwater drainage containing radioactive substances. Even when excavation work is carried out using a tracked vehicle, the bottom of the pond is pulled out without agitation of the soil and the support piles that have been laid are removed, and the original functions of the regulating pond etc. are demonstrated. Providing excavation method for contaminated soil layer that does not cause the problem of disappearance, as well as excavation method for contaminated soil layer, and stirring using an exfoliation type suction device that finely cuts and sucks foreign matter such as aquatic plants Reservoir integrated decontamination method that can include agitation exfoliation type suction method using exfoliation type suction system, and can reduce the burden on the global environment by processing and reusing this eutrophic bottom mud. of Subjected to an object of the present invention.

  The present invention is a method of performing decontamination work without agitating the soil by an endless track of a tracked vehicle, a support pile placing step for placing a support pile, and a floor plate laying step for laying a floor plate, It comprises a drilling process, a floor board removal process, a drilling process after the floor board removal, and a pile head cutting process. The floor board laying process is the next floor board on the laid floor board. Is carried out by repeating the series of steps of carrying and continuously installing the support pile and the step of placing the support pile, and the excavation step excavates while removing the floorboard. In the pile head cutting step, the support pile at the place where excavation is completed adopts a configuration in which the pile head is cut according to the excavation surface.

  Further, the present invention includes a step of confirming the excavation path and a pre-construction excavation depth and a rough root removal step after the support pile placing step and the laying plate laying step and before the excavation step. And after the excavation step after the floor plate removal and before the pile head cutting step, the excavation depth confirmation step after construction, and the simple cesium concentration of the bottom mud after excavation A configuration having a measurement process can also be adopted.

  Further, the present invention may employ a configuration means that, in the removing step, the transport path is replaced and laid and moved substantially parallel to the laying direction.

  Further, the present invention uses pine wood for the support pile, and in the pile head cutting step, cuts the pile head exposed from the ground after excavation, and leaves the remaining support pile in the soil. Thus, it is possible to adopt a configuration that prevents bottoming out of the adjustment pond.

  Further, the present invention may adopt a configuration in which the floor plate is made of metal or resin.

  Moreover, you may employ | adopt the structural means which performs the excavation performed in the excavation process after the said excavation process and the said floor board removal by a backhoe or a vacuum.

  Further, according to the present invention, in the reservoir, the portion where water is drawn is based on the use of the contaminated soil layer excavation method according to any one of claims 1 to 6, and the portion where water is accumulated is By using a stirring and peeling type suction method that sucks the bottom mud R together with water, it is a method of comprehensively decontaminating the entire reservoir. The front surface and both side surfaces are closed, and the front surface has a housing portion that is slidably installed and has a slide plate that changes the width of the opening on the front surface. A stirring roller; a first cutting roller positioned behind the stirring roller and provided with a plurality of disk blades on the circumferential surface; and a plurality of disk blades positioned above the first cutting roller and the circumferential surface A second cutting roller provided on the first cutting roller, and the first cutting roller and the second cutting roller. A suction port located behind the roller and sucking the bottom mud R together with water; and a water supply hose connected to the pump unit and sending the sucked bottom mud R to the trolley side, The cutting roller rotates from bottom to top in front view, and the second cutting roller rotates from top to bottom in front view to remove foreign matter caught in the gap between the first cutting roller and the second cutting roller. A stirring separation type suction device that is cut by the disk blades of the first cutting roller and the second cutting roller, a base ship that is located on the water surface and suspends the stirring separation type suction device on the bottom of the water, and is provided on the land side. A bottom mud treatment device, a hose member for sending the bottom mud sucked by the stirring and peeling type suction device to the bottom mud processing device, and a moving means for moving the stirring and peeling type suction device, The stirring / separating type suction device using a wire as the moving means Using the agitation / removal suction system, which is a pulling / removing suction system that is a shaft-type moving unit that moves by pulling or moving a shaft fixed at one end to the agitation / removal suction device. Disposing the stirring and peeling type suction device to the bottom of the water from the carriage, operating the stirring and peeling type suction device, the stirring roller stirring and scraping the bottom mud, The cutting roller and the second cutting roller cut foreign matter, and the pump portion sucks the bottom mud, the cut foreign matter and water, and the sucked bottom mud, the cut foreign matter and water. A step of pumping the bottom mud treatment device through a hose member; a step of separating the bottom mud from the foreign matter and water by the bottom mud treatment device; and a step of moving the stirring and peeling type suction device at the bottom of the water. You may employ | adopt the structure means which consists of a group.

The present invention also sediment was drilled by the drilling method of the contaminated soil layers, or sucked sediments by the 撹拌peelable suction method, natural dehydration or under圧脱water to the dehydration step, the cesium concentration measurement, can process steps, and also to the pond comprehensive decontamination method fertilizer Manufacturing method utilizing to obtain the fertilizer through the fertilizer component adjustment and processing steps.

  According to the excavation method of the contaminated soil layer used in the reservoir pond comprehensive decontamination method according to the present invention, the heavy equipment moves on the laying slab that becomes the conveyance path, so that the soil contaminated by the endless track of the tracked vehicle It exhibits an excellent effect that enables decontamination work by excavation to be performed effectively without stirring.

  According to the excavation method of the contaminated soil layer used in the reservoir pond comprehensive decontamination method according to the present invention, it is possible to reduce the total number of floorboards to be used by replacing the floorboards.

  Also, in the excavation method of the contaminated soil layer used in the reservoir pond comprehensive decontamination method according to the present invention, in the configuration employing the pine material for the support pile, the pond is left by leaving the support pile. The effect of not pulling out the bottom of the.

  Further, in the removal step in the excavation method of the contaminated soil layer used in the reservoir pond comprehensive decontamination method according to the present invention, when adopting a configuration means for transferring and replacing the conveying path substantially parallel to the laying direction. Exhibits an excellent effect that the laying work of the floorboard can be performed efficiently.

  In addition, among the reservoir pond comprehensive decontamination method according to the present invention, a stirring separation type suction device used in the stirring separation type suction method includes a first cutting roller that rotates from bottom to top in front view, A second cutting roller located above the cutting roller and rotating from top to bottom in front view. And these 1st, 2nd cutting rollers cut | disconnect foreign substances, such as an aquatic plant, in the size which a pump part can attract | suck. For this reason, the suction port of the pump unit is not clogged with foreign matter, and the suction capability of the pump unit can be maintained in a good state. Thereby, the bottom mud suction operation can be performed continuously for a long time. Further, the stirring / peeling type suction device according to the present invention has a top mud, a back surface, and both side surfaces closed, and the front opening is adjusted to an appropriate opening width by the slide plate. It is possible to maintain the bottom mud accumulation state and effectively collect it. In addition, the transparency of water can be maintained. Moreover, since the stirring and peeling type suction device according to the present invention can increase or decrease the opening width of the front opening by the slide plate, it can adjust the concentration of the bottom mud to be fed. Moreover, since the stirring and peeling type suction system and the stirring and peeling type suction method according to the present invention have the stirring and peeling type suction device described above, the bottom mud can be sucked efficiently and continuously for a long time. It is something that demonstrates.

It is a flowchart figure which shows the basic flow of the excavation construction method of the contaminated soil layer utilized with the reservoir pond comprehensive decontamination construction method concerning this invention. It is process explanatory drawing explaining the support pile placing process in the excavation construction method of the contaminated soil layer utilized with the reservoir pond comprehensive decontamination construction method concerning this invention, and a laying board laying process. It is process explanatory drawing explaining the excavation process and removal process in the excavation method of the contaminated soil layer utilized with the reservoir pond comprehensive decontamination method which concerns on this invention. It is process explanatory drawing explaining the excavation process and pile head cutting process after the baseplate removal in the excavation method of the contaminated soil layer utilized with the reservoir pond comprehensive decontamination method which concerns on this invention. It is construction procedure explanatory drawing explaining the laying direction and arrangement | positioning of a flooring board in the excavation construction method of the contaminated soil layer utilized with the reservoir pond comprehensive decontamination construction method concerning this invention. It is an arrangement configuration explanatory view explaining the arrangement relation of the floorboard and the support pile in the excavation method of the contaminated soil layer used in the reservoir pond comprehensive decontamination method according to the present invention. It is area | region explanatory drawing which shows the excavation construction area | region of the contaminated soil layer utilized by the reservoir pond comprehensive decontamination construction method which concerns on this invention, and the stirring peeling type suction construction area | region. It is a flowchart figure which shows the whole flow of the excavation method of the contaminated soil layer, the stirring peeling type suction method, and the manufacturing method of compost and fertilizer in the reservoir pond comprehensive decontamination method concerning this invention. It is a figure which shows the whole stirring peeling type | formula suction system which can be utilized with the reservoir pond comprehensive decontamination method concerning this invention. It is a figure which shows the stirring peeling type suction system which can be utilized with the reservoir pond comprehensive decontamination method which concerns on this invention provided with the other moving means. It is a figure which shows the stirring peeling type suction device which can be utilized with the reservoir pond comprehensive decontamination method concerning this invention. It is a figure which shows the 1st, 2nd cutting roller of the stirring peeling type suction device which can be utilized with the reservoir pond comprehensive decontamination method concerning this invention. It is a figure which shows the example of the stirring roller of the stirring peeling type suction device which can be utilized with the reservoir pond comprehensive decontamination method concerning this invention.

  In the excavation method 1 of the contaminated soil layer used in the reservoir pond comprehensive decontamination method according to the present invention, in the excavation work of the contaminated soil in a locally contaminated place such as a regulating pond, the transportation path of the tracked vehicle is laid with a floor plate. In addition, the greatest feature is that the configuration in which the tracked vehicle is moved only on the constructed conveyance path is adopted. Hereinafter, description will be given based on the drawings.

  FIG. 1 is a flowchart showing a work process of a contaminated soil layer excavation method 1 used in a reservoir pond comprehensive decontamination method according to the present invention. Fig.1 (a) shows the basic flow of the excavation method 1 of the contaminated soil layer which concerns on this invention, FIG.1 (b) is the work process which added the process which may be needed in the implementation decontamination work. The flow which shows is. First, the tool, apparatus, or facility used in the excavation method 1 for a contaminated soil layer according to the present invention will be described.

  The tracked vehicle 10 is a heavy machine or the like having an endless track 11 and is used in the excavation method 1 of the contaminated soil layer according to the present invention. For excavation, movement of the soil T packed in a backhoe, draining flexible container Q, etc. In this case, a carrier dump and a crawler crane or the like are used from the carrier dump loading stage 43 to the water treatment machine yard 44. What is used for excavation in particular is a backhoe in which excavators (buckets) are attached to the operator side among construction machines collectively called hydraulic excavators, which are equipped with an endless track 11 that is resistant to mud and swivels the entire upper body. It is necessary to have a function, and a forward shovel is not suitable. The reason is to prevent the soil T from being agitated by the endless track 11 by allowing the tracked vehicle 10 to move only on the floorboard.

  The endless track 11 is a ring of shoes and shoes that are integrally connected so as to surround the starting wheel, the rolling wheel, and the idler wheel, and the movement of the tracked vehicle 10 on rough terrain by moving the ring with the starting wheel. Is possible.

  The support pile 20 is a pile placed in a place where the floor plate 30 is planned to be laid, and is not particularly limited in terms of material and dimensions, but may be a rope pile, a concrete pile, or a resin pile other than a wooden pile. Based on the embodiment shown in FIG. 5 and FIG. 6, a specific example is as follows. It is desirable to use about eight. This is because pine has a construction advantage that it is denser and harder than other conifers and has high corrosion resistance even in water. In particular, in the present invention, since the remaining support pile 20 obtained by cutting the pile head 21 is left in the ground, the use of an organic material contributes to environmental conservation.

  The pile head 21 is a portion that is excavated while removing the floorboard 30 and is cut according to the pond bottom of the support pile 20 of the path that has been excavated when the excavated mud is put into the draining flexible container 9 and carried out. The unevenness of the pond bottom is eliminated by cutting the pile head after excavation.

  The floor plate 30 is an iron plate or a hard plate-shaped member made of resin, and is preferably, for example, a size of 1.5 meters × 3 meters made of iron and an aspect ratio of 2: 1. The reason for this is that, as shown in FIG. 5 and FIG. 6, after laying two laying boards in the horizontal direction, laying two sheets vertically on top and repeating them alternately, the strength against bending in the surface direction is increased. It is because it becomes possible to raise.

  The conveyance path 40 is a road that is created by laying a floor plate on a route along which the tracked vehicle 10 moves from the laying start position 41 toward the laying direction 50. In addition, the laying direction 50 is basically opposite to the removal direction 60, and the laying direction 50 by replacement is performed while moving substantially in parallel, so that a wide excavation can be performed.

  Soil T is an object to be excavated by decontamination work. In rainwater adjustment ponds and reservoirs where rainwater drainage collects, soil T and defoliation, etc. that contain radioactive substances, accumulate high concentrations of radioactive substances. Soil that is highly likely to be (accumulated) or eutrophic humus.

  Regulating ponds and reservoir ponds P are rainwater that temporarily flows into rivers due to localized flooding such as torrential rains, reduce the burden on downstream rivers and sewer storm drains, and are also agricultural irrigation facilities. It is a reservoir that is managed to be enclosed by fences and the like so that ordinary people cannot enter.

Next, each process which comprises the basic composition of this invention is demonstrated based on Fig.1 (a).
The excavation method 1 of the contaminated soil layer used in the reservoir pond comprehensive decontamination method according to the present invention is a method of performing decontamination work without stirring the soil T by the endless track 11 of the tracked vehicle 10, Contaminated soil layer composed of a pile placing process A, a floorboard laying process B, an excavation process E, a floorboard 30 removal process F, a drilling process G after the floorboard removal, and a pile head cutting process J It is a construction method to excavate.

  FIG. 2 is a process explanatory view for explaining a support pile placing process and a laying board laying process in the excavation method 1 of the contaminated soil layer used in the reservoir pond comprehensive decontamination method according to the present invention, and FIG. Pile placing process A is shown, and FIG.

  The support pile placing process A is a process of placing the support pile 20 into the soil T. The point where the support pile 20 is placed in a place where the floor plate 30 is to be laid is measured with a measure or the like, and a heavy machine such as a backhoe is used. This is the process of placing the If plants such as vegetation are grown on the soil T prior to the placement of the support pile 20, the process of cutting them, packing them in sandbags, etc., and storing them in a temporary storage place for handling organic matter Needless to say, there is a process to perform.

  The laying plate laying step B is a step of laying a laying plate 30 such as an iron plate on the ground surface of the pond. Specifically, it is necessary to arrange the laying support pile 20 in a balanced manner. Specifically, for example, as shown in FIG. 6 (a), two sheets are laid laterally with respect to the support pile 20 driven in accordance with the laying board 30, and two sheets are laid vertically so as to go straight on the piles. This is a process of constructing a transport path for heavy machinery or the like with increased strength against bending and bending. In addition, in the part where the laying direction 50 changes, the cargo handling stage 43, and the like, it is desirable to reinforce the connecting portion between the upper and lower laying boards by arranging three or more laying boards 30 in a superimposed manner.

  FIG. 3 is a process explanatory view for explaining the excavation process E and the removal process F of the floorboard 30 in the excavation method 1 of the contaminated soil layer used in the reservoir pond comprehensive decontamination method according to the present invention, and FIG. Excavation process E is shown, and FIG. 3B shows a floor board removal process F.

  The excavation process E is a process in which excavation in the path is performed by a backhoe or the like, the excavated soil is packed in a draining flexible container Q, loaded on a carrier dump, transported to the loading stage 43, and lifted to the water treatment machine yard 44 by a crane. Thereafter, the process proceeds to a general dehydration process. If the soil T has a high water content, it is also effective to remove the contaminated soil by inhalation with a vacuum.

  The floor board removing step F is a process of removing the floor board and laying the floor board 30 in the construction range to be constructed at the same time after excavation of the floor board portion other than the floor board portion in the path is completed.

  FIG. 4 is a process explanatory view for explaining the excavation process G and the pile head cutting process J after the removal of the bottom plate in the excavation method 1 of the contaminated soil layer used in the reservoir pond comprehensive decontamination method according to the present invention. a) shows the excavation process G after the floor board is removed, and FIG. 4 (b) shows the pile head cutting process J.

  The excavation process G after removing the floorboard excavates the area after the floorboard removal. The excavated soil is packed in a draining flexible container Q, loaded on a carrier dump, carried to the cargo handling stage 43, and lifted to the water treatment machine yard 44 by a crane. Thereafter, the process proceeds to a general dehydration process.

  The pile head cutting process J is a process of cutting the pile head 21 exposed from the bottom of the pond after excavation with a chain saw or the like after confirming the construction effect in the path.

  Next, based on FIG.1 (b), each process generally required in the decontamination operation | work by excavation of the soil T is demonstrated besides the process used as the basic composition of this invention.

  The excavation path confirmation and excavation depth confirmation process C before construction is a process performed after the excavation process G after the removal of the floorboard, and piles of landmarks are placed at the four corners of the excavation path by coordinate management using the total station. It is a step of installing a process and a laser level, lowering a telescopic cage equipped with a detection side rope to the bottom of the pond before construction, etc., and confirming the numerical value of the detection side rope indicated by the laser.

  The rough root removal step D is a step performed before the excavation step E, and is a step of rough root removal in the area by attaching a special bucket for root removal to the backhoe. The coarsely rooted roots are packed in a weather-resistant sandbag, loaded on a carrier dump, transported to the cargo handling stage 43, lifted onto the dam body S by a crane, and stored in a temporary storage place for handling organic matter.

  The excavation depth confirmation process H after construction is a process that is performed after the excavation process G after removing the floorboard. The laser level is set and the telescopic dredge equipped with the inspection rope is lowered to the bottom of the pond after construction. This is a step of confirming the numerical value of the inspection rope indicated by the laser.

Simplified cesium concentration measurement process I of the bottom mud after excavation is a process performed after the excavation depth confirmation process H after construction, and the soil near the center point of the path is collected using a long handle scoop or the like. and mud, packed in containers, packed containers soil placed in co Rimeta is a process for the simple cesium concentration measurements in the default way.

  FIG. 5 is a construction procedure explanatory diagram illustrating the laying direction of the floorboard 30 and the layout of the floorboard 30 in the excavation method 1 of the contaminated soil layer used in the reservoir pond comprehensive decontamination method according to the present invention. In addition, the adjustment pond and the reservoir P shown in FIG. 1 are examples for explaining the arrangement and procedure, and are not limited to the examples. The arrangement and the construction procedure can be changed within the range where the sameness is not lost as the technical idea of the present invention.

  In the decontamination of the pond shown in FIG. 5, the laying board 30 is laid from the laying direction 50 directed upward to the laying direction 50 directed to the right (primary laying board) with the loading stage 43 at the lower left in the figure as the laying start position 41. Then, excavation in the excavation path is performed from the removal start position 42, and after the excavation, the floorboard is removed in the removal direction 60, the excavation after the floorboard removal is performed, and the floorboard that has been removed while repeating this is temporarily removed The replacement laying direction 70 is laid in the direction opposite to the direction 60 and in parallel. The parallel transfer is repeated, and the last conveyance path is removed in the removal direction 90. In this example, the number of primary installations was 217, the number of replacements was 474, the total number of use was 474, and the number of support piles was 1,834.

  FIG. 6 is an arrangement configuration explanatory view for explaining the arrangement relationship between the floorboard 30 and the support pile 20 in the excavation method 1 of the contaminated soil layer used in the reservoir pond comprehensive decontamination method according to the present invention, and FIG. FIG. 6B shows the positional relationship between the floor plate 30 and the support pile 20.

  As shown in FIG. 6 (a), for example, the floor plate 30 having an aspect ratio of 2: 1, such as a standard size of 1524 mm (3 scales) × 3048 mm (10 scales) in the vertical and horizontal directions, two sheets in the horizontal direction. After laying the laying plate 30, the two laying plates 30 are laid vertically on the laying plate 30 and are alternately repeated, thereby making it possible to construct the conveyance path 40 while increasing the strength against bending in the surface direction. Moreover, as shown in FIG.6 (b), it is desirable to lay eight supporting piles with a diameter of 200 mm and a length of 2.0 m per sheet laid on the lower side. In addition, the dimension of the floor plate 30 and the number of the laying 30 and the dimension and the number of driving piles of the support pile 20 are merely examples, and are not limited to these, and are affected by ground strength, support pile strength, and the like. However, it is possible to make changes within a range not losing the same identity as the invention embodied therein.

  FIG. 7 is a region explanatory view showing a region using the excavation method of the contaminated soil layer used in the reservoir pond comprehensive decontamination method according to the present invention and a region using the stirring and peeling type suction method. FIG. 7B shows the entire reservoir P in a top view, and FIG. 7B shows a longitudinal section of the reservoir P. Excavation of contaminated soil layer for soft soil N in the region where the height of the surface layer is lowered by water absorption or dry water using the agitation peeling type suction method for the region from the bottom layer to the surface layer of the water area accumulated by the dam body S Use the construction method. In addition, the order of the excavation method of the contaminated soil layer and the stirring separation type suction method may be appropriately selected depending on the amount of water, the water area, etc. For example, the soil T after suction to the bottom mud R by the stirring separation type suction method is used as the contaminated soil. It may be decontaminated by excavation by a layer excavation method. On the other hand, the soft soil N whose surface layer is lowered by the excavation method of a contaminated soil layer is excavated, and the region of the basin P in which water is accumulated is stirred and separated. The bottom mud R may be sucked together with water by a suction method.

  FIG. 8 is a flowchart showing the entire flow of the excavation method for the contaminated soil layer and the stirring separation type suction method in the reservoir pond comprehensive decontamination method according to the present invention. As shown in FIG. 8, the present invention is based on the use of the contaminated soil layer excavation method 1 and uses the excavation method for a portion where water is not present. On the other hand, when water is present, the stirring and peeling type suction method is used from the lower layer to the surface layer. That is, the excavation method 1 of the contaminated soil layer consisting of the supporting pile placing process A, the laying board laying process B, the excavating process E, the laying board removing process F, the excavating process after removing the siding board, and the pile head cutting process is used as a basic configuration. Thus, the flow may include a carriage arrangement step K1, a stirring and peeling suction device lowering step K2, a stirring / suction step K3, a pressure feeding step K4, a separation / recovery step K5, and a water bottom moving step K6.

As described above, either method may be used for the flow depending on the amount of water present or the water area, but the soil T discharged in any process or step may include plant aquatic plants, dead branches, etc. There are many plant deposits and they may contain enough nutrients as organic fertilizers. Natural dehydration or pressure dehydration is performed after the excavation step E or the separation and recovery step K5 in order to effectively use the soil. configuration flow for a dehydration step X, cesium concentration measurement and processing steps Y, and fertilizer Manufacturing method of obtaining a fertilizer through a fertilizer component adjustment and process Z is added is also effective.

  As shown in FIG.

  Next, embodiments of the agitation / removal suction device 180, the agitation / removal suction system 102 and the agitation / removal suction method used in the reservoir pond comprehensive decontamination method according to the present invention will be described with reference to FIGS. . Here, FIG. 9, FIG. 10 is a figure which shows the whole stirring and peeling type suction system 102 which concerns on this invention. FIG. 11A is a schematic cross-sectional view showing the internal structure of the agitation / removal suction device 180 according to the present invention, and FIG. 11B is a view of the agitation / removal suction device 180 as viewed from the front. FIG. 12 is a schematic view of the first cutting roller 130a and the second cutting roller 130b inside the stirring / separating suction device 180 as viewed from the front side. FIG. 13 is a view showing an example of the agitation roller 140 of the agitation / peeling suction device 180.

  A stirring / separation type suction system 102 according to the present invention shown in FIG. 9 sucks bottom mud R such as a reservoir, pond, lake, or digging together with water, and includes a base boat 110 located on the surface of the water, and the base boat 110. Agitation separation type suction device 180 suspended from the bottom of the water, a bottom mud treatment device 114 provided on the land side, a hose member connecting the agitation separation type suction device 180 and the bottom mud treatment device 114, And a moving means 150 for moving the stirring / separating type suction device 180 installed on the land. The hose member has a well-known relay pump 116 installed on the carriage 110, and connects the water supply hose 112 connected to the stirring / separation type suction device 180 and the relay hose 118 connected to the bottom mud treatment device 114 to the relay pump 116. It is preferable to connect and configure via the. According to this configuration, since the relay pump 116 assists the pumping of the bottom mud R and the like sucked by the agitation and separation type suction device 180, even if the total extension of the hose member is long, the bottom mud treatment device 114 such as the bottom mud R and the like Can be pumped without delay.

  The carrier 110 is a scaffold where the operator mainly operates and moves the stirring / separation type suction device 180. The carrier 110 may be floated on the surface of the water with a float or the like. It may be fixed to the water surface.

Further, the bottom mud treatment device 114 separates and collects the bottom mud R sucked together with the water by the stirring / separation type suction device 180, and any device may be used. The general bottom mud treatment apparatus 114 includes a well-known separation means for separating the sucked bottom mud R and foreign matter, a well-known bottom mud separation means for separating the bottom mud R and water, and a separated bottom. A known dehydrating means for dewatering and collecting the mud R.

  The moving means 150 is for moving the stirring / separation type suction device 180 at the bottom of the water, and any device may be used. Here, as a suitable example of the moving means 150, the structure of the traction means 150a and the shaft type moving means 150b will be described. First, the traction means 150 a includes a wire 154 connected to the stirring / separating suction device 180, and a crane 152 capable of winding and unwinding the wire 154. In this configuration, the stirring / separating suction device 180 can be suspended, lifted, moved forward and laterally at the bottom of the water by the falling operation of the crane 152 and the winding and unwinding operations of the wire 154. Further, two traction means 150a may be provided so as to sandwich the lake where the bottom mud R is collected, and the stirring / separation type suction device 180 may be moved forward and backward.

  Further, as shown in FIG. 10, the shaft type moving means 150b has one end of a shaft 156 fixed to, for example, the casing 128 of the stirring / separating type suction device 180, and the shaft 156 is pushed or pulled from the carriage 110 or the land. The stirring separation type suction device 180 is moved. In the shaft type moving means 150b, the stirring / separation type suction device 180 may be suspended and lifted by a well-known winch or the like. Further, the moving means 150 combines the pulling means 150a and the shaft type moving means 150b. For example, the agitation / separation type suction device 180 is moved forward using the traction means 150a, and the agitation / peeling type suction device 180 is moved backward by the shaft type movement. You may make it carry out using the means 150b. In particular, in the configuration using the moving means 150 capable of moving forward and backward of the stirring / peeling suction device 180, the horizontal mud of the bottom mud R is continuously and efficiently moved by sequentially shifting the lateral position of the stirring / peeling suction device 180. Can be done.

  Next, the stirring / separating suction device 180 which is a characteristic configuration of the present invention will be described. The agitation / peeling suction device 180 according to the present invention is a device that suspends the bottom mud R from the carriage 110 to the bottom of the water and sucks the bottom mud R together with water, and is positioned in front of the casing 128 and the casing 128. A stirring roller 140 for stirring the bottom mud R, a first cutting roller 130a located behind the stirring roller 140 and provided with a plurality of disk blades 134a on the circumferential surface, and above the first cutting roller 130a. A second cutting roller 130b that is positioned and has a plurality of disk blades 134b provided on the peripheral surface, and is located behind the first cutting roller 130a and the second cutting roller 130b and sucks the bottom mud R together with water. It has a pump part 120 and a water supply hose 112 that is connected to the pump part 120 and sucks the sucked bottom mud R to the carriage 110 side. The agitation / peeling suction device 180 may further include a peeling roller 160 that is provided in front of the pump unit 120 and removes foreign matter adhering to the suction port of the pump unit 120.

  Further, as shown in FIGS. 11A and 11B, the casing 128 that constitutes the stirring / separating suction device 180 has a front surface and a bottom surface that are located in front of the stirring roller 140, and an upper surface and a rear surface. It has a box shape in which the surface and both side surfaces 128a are closed and the back surface is an inclined surface. And the pump part 120 is fixed to this slope with the suction port inside. A slide plate 129 is slidably installed in the opening on the front surface of the casing 128. Then, by lowering the position of the slide plate 129 and narrowing and fixing the opening width of the front opening, the ratio of the bottom mud R taken in by the stirring and peeling type suction device 180 is increased and the bottom mud R sent to the bottom mud treatment device 114 is increased. The concentration of can be increased. Moreover, the case where the thickness of the bottom mud R is thick can be accommodated by raising the position of the slide plate 129 and fixing the opening width of the front opening. Moreover, the concentration of the bottom mud R sent to the bottom mud treatment apparatus 114 can be reduced by increasing the amount of water taken up.

  In addition, since the top surface, the back surface, and both side surfaces 128a of the housing portion 128 are closed, the front opening is adjusted to an appropriate opening width by the slide plate 129, so that the bottom mud stirred in the stirring and peeling type suction device 180 is used. R hardly leaks from the inside of the housing portion 128, and the bottom mud R can be effectively recovered. Further, since the casing 128 shields the water flow generated by the rotation of the stirring roller 140, the cutting rollers 130a, 130b, etc. in the casing 128, the bottom mud R does not rise up, and the bottom mud R is accumulated. It is possible to carry out effective dredging while maintaining. Moreover, the transparency of water can be maintained by preventing the raising of the bottom mud R. In particular, when the bottom mud R contains radioactive substances, efficient decontamination can be performed without re-diffusion of these radioactive substances.

  Further, as shown in FIGS. 11 and 12, a first motor 170a for rotating the first cutting roller 130a and the second cutting roller 130b, a stirring roller 140, and a peeling roller are provided on the upper surface of the casing 128. The second motor 170b that rotates the motor 160 is fixed.

  As shown in FIG. 13, the stirring roller 140 includes a cylindrical roller 142 and a stirring member 144 installed on the peripheral surface of the roller 142. The shape of the stirring member 144 is not particularly limited, and may be a wire brush as shown in FIG. 13 (a) or a plate-like body as shown in FIG. 13 (b). Moreover, it is good also as a plate blade as shown in FIG.13 (c). Further, the stirring roller 140 may be replaceable. According to this configuration, for example, when there are many submerged plants such as algae, a wire brush agitation roller 140 is used, and when there are a lot of water extraction plants such as cattails and corals, a plate blade agitation roller 140 is used. An appropriate agitation roller 140 can be selected according to the environment, especially the type of aquatic plants and the state of overgrowth.

  The stirring roller 140 is pivotally attached to the casing 128 via a known bearing such as a bearing. The installation position of the agitation roller 140 may be fixed, or the position of the agitation roller 140 may be adjusted in the vertical direction or the oblique direction. A gear 146 is fixed to one end of the roller 142, and this gear 146 is connected to a reduction gear 172b of the second motor 170b through a power transmission mechanism (not shown) such as a chain. Then, as the second motor 170b rotates, the rotational force is transmitted to the stirring roller 140 via the reduction gear 172b, the power transmission mechanism, and the gear 146, whereby the stirring roller 140 rotates. In addition, the direction of rotation of the stirring roller 140 at this time is preferably the direction indicated by the arrow in FIG.

  The first cutting roller 130a and the second cutting roller 130b are cylindrical rollers 132a and 132b and a plurality of disc blades 134a and 134b installed on the peripheral surfaces of the rollers 132a and 132b at substantially equal intervals. And scrapers 138a and 138b installed in the vicinity of the disc blades 134a and 134b. The disk blades 134a and 134b are for cutting foreign substances such as aquatic plants, and the installation interval is preferably about 5 to 15 cm. Further, the scrapers 138a and 138b have a function of catching and pulling in foreign substances such as aquatic plants and crushing them.

  The both ends of the first and second cutting rollers 130a and 130b are pivotally attached to the casing 128 via known bearings. At this time, the second cutting roller 130b is installed above the first cutting roller 130a, for example, directly above or obliquely forward. Further, the installation interval between the first cutting roller 130a and the second cutting roller 130b is such that the disc blade 134a of the first cutting roller 130a and the disc blade 134b of the second cutting roller 130b overlap in a side view. It is preferable to set the position. Therefore, it is preferable that the positions of the disc blades 134a and 134b and the scrapers 138a and 138b are slightly shifted in the axial direction between the first cutting roller 130a and the second cutting roller 130b. Further, the disc blade 134a and the disc blade 134b are preferably arranged close to each other, and as shown in FIG. 4, the other disc blade 134a (134b) and the scraper 138a (138b) are disposed between the other disc blade 134a and the disc blade 134b. Most preferably, the disc blade 134b (134a) is positioned. According to this configuration, the lower disc blade 134a and the upper disc blade 134b sandwich the foreign matter such as aquatic plants that the first and second cutting rollers 130a and 130b are entrained to effectively cut. Can do.

  In addition, gears 136a and 136b are fixed to one ends of the first and second cutting rollers 130a and 130b, and the gears 136a and 136b are connected to a reduction gear 172a of the first motor 170a via a power transmission mechanism 174. . Here, the reduction gear 172a and the gear 136a of the first cutting roller 130a are connected via a chain as the power transmission mechanism 174, and the gear 136b of the second cutting roller 130b is fixed to the first cutting roller 130a. An example of connection through the transmission gear 136c is shown. Then, as the first motor 170a rotates, the rotational force is transmitted to the first cutting roller 130a via the reduction gear 172a, the chain (power transmission mechanism 174), and the gear 136a. The cutting roller 130a rotates. Note that the rotation direction of the first cutting roller 130a at this time is a direction in which the first cutting roller 130a rotates from the bottom to the top in the front view shown by the arrow in FIG. Further, the transmission gear 136c is rotated by the rotation of the first cutting roller 130a, and this rotational force is transmitted to the second cutting roller 130b by the gear 136b meshing with the transmission gear 136c, thereby the second cutting roller. 130b rotates from the top to the bottom as viewed from the front in the opposite direction to the first cutting roller 130a indicated by the arrow in FIG.

  At this time, it is preferable to make the rotation speed of the second cutting roller 130b slower than the rotation speed of the first cutting roller 130a, for example, by making the gear ratio of the gear 136b larger than that of the transmission gear 136c. According to this configuration, the disc blade 134a of the first cutting roller 130a and the disc blade 134b of the second cutting roller 130b rotate at different speeds, and the cutting ability against foreign matters can be further improved. Further, by increasing the rotational speed of the lower first cutting roller 130a, the first cutting roller 130a can also serve to agitate the bottom mud R. The ratio of the rotation speeds of the first cutting roller 130a and the second cutting roller 130b is preferably about 1: 4 to 1: 8, and most preferably about 1: 6.

  Further, the peeling roller 160 includes a cylindrical roller 162 and a peeling member 164 installed on the peripheral surface of the roller 164. Then, both ends of the peeling roller 160 are rotatably attached to the housing portion 128 via a known bearing. The position of the peeling roller 160 at this time is a position where the peeling member 164 is in contact with or close to the suction port of the pump unit 120. The peeling member 164 is not particularly limited, and a synthetic resin brush, a spatula member, or the like can be used. A gear (not shown) is fixed to one end of the peeling roller 160, and this gear is connected to a reduction gear 172b of the second motor 170b via a power transmission mechanism (not shown) such as a chain. Then, as the second motor 170b rotates, the rotational force is transmitted to the peeling roller 160 via the reduction gear 172b, the power transmission mechanism, and the gear, whereby the peeling roller 160 rotates. In addition, although there is no limitation in particular in the rotation direction of the peeling roller 160 at this time, the direction rotated from top to bottom in the front view shown by the arrow in FIG.

  The pump unit 120 is not particularly limited as long as it can suck a fluid having a certain degree of viscosity, and it is particularly preferable to use a well-known underwater sand pump.

  Next, the operation of the agitation / removal suction device 180 and the agitation / removal suction system 102 according to the present invention and the agitation / removal suction method according to the present invention using these will be described.

  First, the bottom mud treatment device 114 is installed on the land side such as a reservoir, pond, lake, or excavation where dredging is performed. Next, the trolley 110 equipped with the stirring / separation type suction device 180 and the relay pump 116 is disposed at a predetermined position on the water surface. There is no particular limitation on the method of installing the carriage 110 at this time. Next, the relay pump 116 and the stirring and peeling type suction device 180 are connected by the water supply hose 112, and the relay pump 116 and the bottom mud treatment device 114 are connected by the relay hose 118. Next, the operator adjusts the position of the slide plate 129 so that the opening width of the front opening is appropriate.

  Next, the operator operates the moving means 150 and the like to lower the stirring / separation type suction device 180 from the carriage 110 to the bottom of the water. Next, the operator operates the stirring / separation type suction system 102. As a result, the first motor 170a and the second motor 170b of the stirring / separating suction device 180 rotate, and the stirring roller 140 and the peeling roller 160 rotate from top to bottom as viewed from the front. Further, the first cutting roller 130a rotates from the bottom to the top when viewed from the front, and the second cutting roller 130b rotates from the top to the bottom when viewed from the front. Further, the pump unit 120 and the relay pump 116 are operated to perform a suction operation. Thereby, the agitation roller 140 agitates sediments such as bottom mud R and earth and sand accumulated on the bottom of the water and soars to the first cutting roller 130a side, and also includes foreign matter such as aquatic plants, plant deposits such as dead branches, and dust. Is lifted or pulled out and sent to the first cutting roller 130a side. Then, the relatively fine particles such as the bottom mud R and the earth and sand that have moved up pass through the gap between the first cutting roller 130a and the second cutting roller 130b and move to the pump unit 120 side. Further, foreign matters such as aquatic plants, plant deposits, and dust are caught in the gap between the first cutting roller 130a and the second cutting roller 130b, and the disc blade 134a and the second cutting blade of the first cutting roller 130a. It is cut into an appropriate length by the disk blade 134b of the roller 130b. And it is discharged | emitted by the back pump part 120 side. As described above, since the upper surface, back surface, and both side surfaces 128a of the casing 128 are closed, the raised bottom mud R or the like hardly leaks to the outside of the casing 128. You can work while maintaining transparency.

  The pump unit 120 sucks the bottom mud R and the cut foreign matter together with water, and pumps it through the water supply hose 112 to the relay pump 116 side. In addition, since the foreign material is cut into an appropriate size by the first and second cutting rollers 130a and 130b as described above, the foreign matter is not caught by the suction port of the pump unit 120. Moreover, even if it is caught in the suction port of the pump unit 120, the peeling roller 160 removes it and sends it to the first and second cutting rollers 130a and 130b. Then, the cutting process is performed again by the first and second cutting rollers 130a and 130b. Thereby, the suction port of the pump unit 120 is not clogged with foreign matter, and the suction capability of the pump unit 120 can be maintained in a good state. Then, the operator appropriately operates the moving means 150 to move the stirring / separating type suction device 180 at the bottom of the water. As a result, new bottom mud R is taken into the casing 128 through the front opening limited by the slide plate 129, and continuously sucked and pumped.

  Bottom mud R, earth and sand, water, foreign matter, etc. sucked by the pump unit 120 are sent to the relay pump 116 through the water supply hose 112 and are pumped to the bottom mud treatment device 114 through the relay hose 118. First, foreign substances, pebbles, sand and the like are separated and removed by known separation means such as a sieve and a centrifugal separator. Next, it is stored in a well-known bottom mud R separation means such as a sedimentation tank, and for example, a flocculant is charged. Thereby, the bottom mud R aggregates and separates from the water. The separated water is discharged to the original pond or the like through the discharge pipe 115. Further, the sediment-concentrated bottom mud R is, for example, sent to a dehydrating means, dehydrated, recovered, and subjected to appropriate processing.

  As described above, the agitation / peeling suction device 180 according to the present invention includes the first cutting roller 130a that rotates from the bottom to the top in the front view, and is positioned above the first cutting roller 130a and the top in the front view. And a second cutting roller 130b that rotates downward. Then, the first and second cutting rollers 130a and 130b cut the foreign matter such as aquatic plants accumulated on the bottom of the water into a size that can be sucked by the pump unit 120. For this reason, the suction port of the pump unit 120 is not clogged with foreign matter, and the suction capability of the pump unit 120 can be maintained in a good state. Thereby, the suction operation | work of the bottom mud R can be performed continuously for a long time.

  Further, the stirring / separation type suction device 180 according to the present invention has a stirring roller 140 on the front side of the first and second cutting rollers 130a and 130b. The agitating roller 140 agitates sediments such as bottom mud R and earth and sand accumulated on the bottom of the water to assist suction by the pump unit 120, and also flits foreign matter such as aquatic plants, dead branches and other plant sediments, and dust. It is raised or pulled out and sent to the first cutting roller 130a side. As a result, the load on the first and second cutting rollers 130a and 130b is reduced, and the foreign matter can be cut smoothly.

  At this time, since the top surface, the back surface, and both side surfaces 128a of the casing unit 128 are closed, the stirring / separation type suction device 180 according to the present invention is configured so that the bottom mud R or the like stirred in the casing unit 128 is enclosed in the casing. It does not leak to the outside of the body part 128 and can work while maintaining the transparency of the lake. In addition, it is possible to perform an effective recovery operation while maintaining the accumulation state of the bottom mud R. In particular, when the bottom mud R contains radioactive substances, efficient decontamination can be performed without re-diffusion of these radioactive substances. Further, by adjusting the position of the slide plate 129 according to the thickness of the bottom mud R and optimizing the opening width of the front opening, the bottom mud R having an appropriate concentration is pumped to the bottom mud treatment device 114 side. Can do.

  Furthermore, the agitation / peeling suction device 180 according to the present invention has a peeling roller 160 in the vicinity of the suction port of the pump unit 120. The peeling roller 160 sweeps the suction port of the pump unit 120, and even if a foreign object is caught on the suction port of the pump unit 120, it can be removed. Thereby, the suction work of the bottom mud R can be stably performed continuously for a long time.

  And the stirring peeling type suction system 102 and the stirring peeling type suction method according to the present invention provided with the stirring peeling type suction device 180 can perform the suction work of the bottom mud R efficiently and continuously for a long time.

  It should be noted that the shape, configuration, operation mechanism, arrangement, piping route, etc. of each part of the stirring / separation type suction device 180 and the stirring / separation type suction system 102 shown in this example are examples, and can be changed without departing from the scope of the present invention. Can be implemented.

  The dehydration process X is a process of natural dehydration or pressure dehydration for removing moisture from the excavated bottom mud R or soil T. Specifically, the bottom mud R or soil T is packed in a draining flexible container Q. This is a process of discharging excess moisture.

  The cesium concentration measurement / treatment process Y measures the concentration from the turbid water containing radioactive cesium in the bottom mud R or soil T packed in flexible containers, classifies it into fine particles, and diffuses the dose when used in a dehydrator This is a process for performing processing so as not to occur.

  The fertilizer component adjustment / treatment step Z is a step for effectively using a portion that can be used as soil containing organic fertilizer in the soil T after the dehydration treatment, and analyzes the components of the soil so as to correspond to the type of crop. Nitrogen, phosphoric acid, and potassium, which are said to be the three major nutrients of fertilizers, are added, preferably calcium, magnesium, and even copper, zinc and other essential elements added to suit various plant types and cultivation methods. It is a process of obtaining soil. By passing through such a process, the soil to be treated can be distinguished from the soil that can be effectively used, and the load on the global environment can be reduced.

  The present invention is a rainwater control pond where rainwater drainage collects, a reservoir pond P, etc., where radioactive materials are concentrated (accumulated) due to accumulation of earth and sand, fallen leaves, etc. In the decontamination work such as a reservoir, it is possible to prevent the soil T from being agitated by the endless track of the tracked vehicle and to perform an effective decontamination work. In the field, industrial applicability is considered high.

DESCRIPTION OF SYMBOLS 1 Excavation method of contaminated soil layer 10 Tracked vehicle 11 Endless track 20 Pile 21 Pile head 30 Pile plate 40 Transfer path 41 Laying start position 42 Removal start position 43 Handling stage 44 Water treatment machine yard 50 Laying direction 60 Removal direction 70 Replacement laying Direction 80 Replacement removal direction 90 Removal direction A Support pile placing process B Laying board laying process C Confirmation of excavation path and confirmation of excavation depth before construction D Rough root removal process E Excavation process F Removal process G Excavation process H after removal of floorboard Drilling depth confirmation process after construction I Simplified cesium concentration measurement process J Pile head cutting process K Step R Bottom mud S Dam body T Soil
N Excavation method area P of contaminated soil layer P Reservoir (Agitation separation type suction method area)
DESCRIPTION OF SYMBOLS 101 Agitation peeling type suction method 102 Agitation peeling type suction system 110 Carrier 112 Water supply hose 114 Bottom mud processing device
120 Pump part
128 Case
128a side
129 slide plate
130a First cutting roller
130b Second cutting roller
134a, 134b Disc blade
140 Stirring roller
150 Moving means
150a Towing means
150b Shaft type moving means
154 wire
156 shaft
160 Peeling roller
180 Agitation peel type suction device
201 fertilizer Manufacturing method

Claims (2)

In the reservoir, the part where water is drawn is basically constructed using the excavation method (1) of the contaminated soil layer, and the part where water is accumulated is the agitation and peeling type suction method that sucks the bottom mud (R) together with water ( 101), in the method of comprehensive decontamination of the entire reservoir,
Excavation method (1) of the contaminated soil layer is
The endless track (11) of the tracklaying vehicle (10) soil (T) without 撹拌, a method of performing decontamination,
A support pile placing step (A) for placing the support pile (20);
A laying plate laying step (B) for laying the laying plate (30);
Excavation process (E);
The removal process (F) of the floorboard (30),
Excavation process (G) after removing the floorboard,
Pile head cutting process (J),
Consisting of
The laying plate laying step (B) includes a series of steps in which the tracked vehicle (10) conveys and installs the next laying plate (30) on the laid laying plate (30) and the supporting pile. By constructing the conveying path (40) of the tracked vehicle (10) by repeating the placing step (A),
The excavation step (E) is to excavate while removing the floorboard (30),
In the pile head cutting step (J), the support pile (20) in the place where excavation has been completed is a method of cutting the pile head (21) according to the excavation surface,
The 撹拌peelable suction method (101),
The front and bottom surfaces are open and the top surface, back surface, and both side surfaces (128a) are closed,
The front surface has a housing (128) that is slidably installed and includes a slide plate (129) that changes the width of the opening of the front surface.
An agitation roller (140) for agitating the bottom mud R located in the front, and a first cutting roller (130a) located behind the agitation roller (140) and provided with a plurality of disk blades (134a) on the circumferential surface ), A second cutting roller (130b) positioned above the first cutting roller (130a) and provided with a plurality of disk blades (134b) on the peripheral surface, and the first cutting roller (130a) ) And the second cutting roller (130b), the suction port is located behind the pump part (120) for sucking the bottom mud (R) together with water, and the bottom mud (R) connected to the pump part (120) and sucked. ) and barge (110) to the side water supply hose (112) has a, together with the first cutting roller (130a) rotates from bottom to top in front view, the second cutting roller (130b ) Rotates from top to bottom when viewed from the front, and the first cutting rod The disc blades (134a, 134b) of the first cutting roller (130a) and the second cutting roller (130b) cut the foreign matter caught in the gap between the roller (130a) and the second cutting roller (130b). A stirring and peeling type suction device (180);
The stirring peeling type suction device (180) said barge to a hung underwater while positioned on the water surface (110),
A bottom mud treatment device (114) provided on the land side;
A hose member for sending the bottom mud (R) sucked by the stirring and peeling type suction device (180) to the bottom mud treatment device (114);
Moving means (150) for moving the stirring / separating suction device (180), and the moving means (150) moves by pulling the stirring / peeling suction device (180) by a wire (154). traction means (150a) or the stirring peeling type suction device (180) to press the shaft (156) which is fixed one end pulled by the shaft-type moving means for moving (150b) stirred peelable aspiration system Ru der to (102 )
Placing the trolley (110) at a predetermined position on the water surface (K1);
Lowering the stirring and peeling type suction device (180) from the carriage (110) to the bottom of the water (K2);
The stirring and peeling type suction device (180) is operated, and the stirring roller (140) stirs and scrapes the bottom mud (R), and the first cutting roller (130a) and the second cutting roller (130b). ) Cuts foreign matter, and the pump part (120) sucks the bottom mud (R), the cut foreign matter and water (K3),
A step (K4) of pumping the sucked bottom mud (R), the cut foreign matter and water to the bottom mud treatment device (114) through a hose member;
The bottom mud treatment device (114) separates and collects the bottom mud (R) from foreign matter and water (K5);
Moving the stirring and peeling type suction device (180) at the bottom of the water (K6);
Reservoir pond decontamination method (3), characterized in that it consists of The sediment excavated by drilling method of the contaminated soil layers (1) (R), or sediment (R) is sucked by the 撹拌peelable suction method (101), naturally dehydrated or under圧脱water dehydration step (X), cesium concentration measurement and processing step (Y), as well as nutrients adjustment and process pond comprehensive decontamination method of claim 1, (Z) via; and obtaining fertilizer (3 ) Fertilizer manufacturing method (201).

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