KR200460536Y1 - Vacuum deep well drainage system for underground water level lowering method - Google Patents

Abstract

  The present invention relates to a groundwater drainage system for forcibly draining groundwater by connecting a vacuum pump and an underwater pump in order to prevent the collapse of the excavation surface by the water flowing out of the ground during various constructions, such as trench construction,

It is a drainage treatment device using a conventional deep well (deep well) and a forced drainage method using a vacuum pump with limited excavation scope. Compared to the groundwater drainage treatment device of the well point method, which is limited to m.

As the groundwater treatment period is very short and the applied soil is extensive, it can be applied to silt and general clay ground with low permeability, so it can be widely used regardless of the depth of excavation in excavation work.

      The pumping efficiency is high and the construction period is drastically shortened, so it is possible to dry work in the excavation zone made of soft silt and viscous soil, and the work efficiency is improved to improve the stability and quality workability.

Vacuum pump drainage, underground water level drop, deep well, vacuum pump, submersible pump, drying construction, soft ground, pumping efficiency, vacuum suction pipe, drain pipe

Description

Vacuum deep well drainage system for underground water level lowering method}

The present invention relates to a vacuum pump drainage device for underground water level reduction accompanying excavation work in order to prevent the collapse of the excavation surface by the water flowing out of the ground during various constructions such as trenching,

More specifically, it is a drainage device using conventional deep wells and a limited drainage method using a vacuum pump. Compared to the groundwater drainage treatment device of the well point method, which is limited to 4.0 to 4.5m.

As the groundwater treatment period is very short and the applied soil is extensive, it can be applied to silt and general clay ground with low permeability, so it can be widely used regardless of the depth of excavation in excavation work.

 Higher pumping efficiency and shorter construction period than the prior art process equipment enables dry construction even in excavation zones made of soft silt and viscous soils. It relates to a vacuum pump drainage device for underground water level lowering effect that improves.

       In Korea, the groundwater permeability coefficient of most regions is 1 × 10- due to the distribution of granite weathering zones with low permeability coefficients and the mixing of high permeability sand and clay layers. As it has less than 4cm / sec characteristics, when excavating the ground below the groundwater level, there is a problem that the groundwater constantly accumulates at the excavation point and interferes with the construction process. It depends on whether you have a good response,

The excavation process is one of the most common accidents among foundation works. Excessive work is not possible in the case of severe water pressure on the underground water level or the ground. Excavation is not possible without drainage work. There is a problem in that the delay of the process and the risk of accidents exist due to the collapse of the spilled slope of the soil.

Conventional groundwater countermeasures in construction are known as index construction that blocks groundwater from entering the walls, or a method of lowering the groundwater level by draining groundwater to the ground.

In the above groundwater dewatering method, the groundwater level is temporarily lowered by installing a drainage system in the ground in order to prevent the collapse of the excavation surface due to the outflowing water during the construction of the trench. As a method to let

There are well point methods and deep well points depending on the extent of the ground, the permeability of the ground, and the depth of excavation.

The groundwater level lowering device by the well point method is a forced drainage method using a vacuum pump, but the depth to process the groundwater by one installation is limited to 4.0 to 4.5m. There is a problem that a well point (water intake pipe), which is a water intake pipe, must be installed in the ground.

In addition, as another method, the wastewater treatment apparatus 1 by a general deep well point,

As shown in Fig. 1, a deep well 2 of vertical wells is dug in the ground in the form of the most basic well in the periphery to excavate,

In the deep well (2) to form a strainer (3) in which the fine pores perforated as an inner casing concentrically,

 A gravel layer (filter) 7 is formed in the space between the well wall of the deep well 2 and the strainer 3 to prevent soil or foreign matter from entering the groundwater, thereby preventing the strainer 3 from clogging and maintaining a proper flow rate. So that it can be pumped while

In addition, the strainer (3) is a discharge pipe with a submersible pump (5) at the end is inserted into the pumping pipe (4) and connected to the ground through a drain pipe (6) connected to the ground for underground pumping drainage to the ground It is formed of a water pump drainage device for water level reduction (1) is a device for lowering the groundwater level by draining only the groundwater without the movement of the earth,

As described above, the conventional wastewater treatment system using a deep well point (deep well point) has a very large amount of water and is employed when it is difficult to install the well point. It is a device that only drains the groundwater, and the groundwater drainage treatment period is very long and the depth of excavation is deep. As a groundwater drainage device that can be used only in a high sand layer, there is a problem in that the scope of excavation is limited.

 Therefore, the present inventors replace the conventional wastewater treatment device by deep well point (deep well point) for lowering the water level,

As a result of efforts to solve the problems of the conventional ground well drainage method (deep well point), such as the groundwater drainage method, the limited scope of excavation work and the poor ground drainage efficiency is not good,

DRY WORK is also possible in excavation zones made of cohesive soils, which reduces the groundwater level and affects the area of Jeongho (deep well) parish, and increases work efficiency by promoting drainage of soft ground. It is to develop a vacuum pump drainage device for underground water level reduction accompanying the excavation work of the present invention improved stability and workability.

The present invention is designed to solve the above problems,

The excavation work of the deep well point is limited and the underground drainage efficiency is not good. Therefore, the maintenance cost and operating cost are high, and the conventional well point method has a depth of 4.5m. As the drainage gap is narrow due to the low water level limit of the water level, it solves the problem that the well point (water intake pipe), which is a water intake pipe, must be installed in the underground in several stages, and the advantages of each method are utilized.

In case of pumping groundwater drainage, the depth of insertion of the construction pipe can be deeper than the well point method of groundwater drainage system, so the pumping efficiency is good. It is possible to use a wide range regardless of the depth of excavation, and to realize the effect of shortening the air and reducing the construction cost at the same time. There is.

The present invention is a pump drainage device for underground water level reduction accompanying the excavation construction of the conventional construction method as described above to solve the problems in general,

Digging deep well (deep well, vacuum deep well) exceeding 4.5m of excavation depth which is the limit of water level drop by conventional well point method and using the vacuum pump, the air pressure in the deep well drops Underwater pressure can be used to collect groundwater forcibly by using a submersible pump, and the pumping efficiency of groundwater, which causes obstacles in construction, is greatly improved by the combined synergy effect of the connection between the vacuum pump and the submersible pump.

Dry work is possible even in excavation zones made of silt and soft viscous soils with low permeability coefficients, and can be used widely regardless of the depth of excavation. It is an object of the present invention to provide a vacuum pump drainage device for lowering the groundwater level of a relatively deep intake method that can quickly drain groundwater to reduce the groundwater level.

The present devised in this way,

Excavation depth can be set deep enough to exceed the excavation depth 5m, which is the limit of the water level drop by the conventional well point method, and it is suitable for the ground of the strata structure such as silt or clay layer with low permeability coefficient. Deep well point (Deep well point) and suction by using vacuum pump can pump groundwater using submersible pump under reduced pressure, and the well effect is improved by vacuum effect. The efficiency is greatly improved, and the amount of pumped water in the forced drainage due to the vacuum effect at a large depth is larger than that of the conventional wellpoint method, and the groundwater level can be lowered by draining the groundwater rapidly and extensively.

      Compared to the conventional groundwater drainage method, the forced drainage efficiency of groundwater, which causes problems in construction, is greatly improved, so that continuous dry construction is possible even in excavation zones of soft clay soil regardless of the ground structure. As the work efficiency is improved by preventing the boiling phenomenon and the piping phenomenon caused by the similarity, the construction can be carried out easily, quickly and safely with safe dry work. As the cost, construction period, and number of constructions are reduced, the pumping efficiency is high and the construction period is greatly shortened, thereby improving the stability of construction and quality construction.

Detailed description of the components of the present invention for achieving the above object by the accompanying drawings as follows, and the detailed description of well-known components that may obscure the subject matter of the present invention will be omitted, the drawings for the same components The same reference numerals are used.

The present invention is an inner casing having a pumping pipe (30) equipped with a water pump (31) at the end in order to prevent the collapse of the excavation surface by the water flowing out of the ground during various constructions such as trench work, strainer (20) Is installed in a concentric manner and formed by forming a gravel layer (filter) 11 in the space between the well wall of the deep well 10 and the strainer 20 to dig the deep well 10 to operate the submersible pump 31. In the pump water drainage device for underground water level reduction to pump groundwater to the ground through the drain pipe 32 connected to the pump pipe 30,

  One side of the upper side between the strainer 20 and the pumping pipe 30 located on the ground surface is controlled by the controller 50, and one of the ball valves BV is selectively connected to one another by opening and closing the flow path of the plurality of ball valves BV. The vacuum suction pipe 42 is connected to the plurality of vacuum pumps (40a, 40b) which are connected to the pipe,

In addition to the pumping discharge pressure of the high-pumping submersible pump 31, the groundwater accumulated in the high periphery of the lower portion of the pump pipe 30 due to a well effect in which the vacuum suction pressures of the vacuum pumps 40a and 40b complement each other. It is a vacuum pump drainage device 100 for lowering the groundwater level, which is involved in the excavation work that allows the groundwater level to be reduced and the groundwater level is reduced by expanding the groundwater level and the effect range of the drainage device. .

In addition, the inner surface of the inner wall between the pumping pipe 30 and the strainer 20 is a thin level sensor rod-shaped level sensor 60 and a vacuum gauge 41 for measuring the vacuum pressure, respectively, the control panel (PLC) It is configured to automatically operate by connecting to each of the controller 50 of the form, and a plurality of check valves (CV) are installed in the drain pipe 32 connected to the upper portion of the pump pipe 30 to prevent backflow and vacuum suction pipe (42) On the pipeline, a cleaner 70 in the form of a dense mesh screen is provided to filter foreign matter.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As described above, the present invention is widely applied to geotechnical soils with low permeability coefficients such as silt layers and mud layers, and drills deep wells (deep wells, deep wells, deep wells) 10 by drilling at a predetermined depth on the surface of the earth. A well built-in casing having a pumping pipe 30 equipped with a submersible pump 31 at its end, and the strainer 20 is concentrically installed in a deeper well of a larger diameter than the strainer, and the wall of the well 10 In the space between the strainer (casing strainer) 20 provided with a pore constitutes a vertical well pipe (water well) of a double tube type is formed a gravel layer 11 of the filter function to prevent clogging of the strainer, a plurality of vacuum pumps (40a) (40b) Collect the groundwater sucked by the suction pressure to operate the submersible pump 31 to pump the groundwater to the ground through the drain pipe 32 connected to the pump pipe 30 and the ground water level reduction for the ground As a pump drainage device 100, a groundwater drainage device of a forced drainage method in which a vacuum pump is organically coupled to a conventional deep well groundwater drainage device, and thus has a large amount of drainage compared to the prior art, and thus the water level is lowered. The efficiency is better than the prior art.

In addition, the deep well (core) 10 according to the present invention is excavated and expanded to a predetermined depth underground (depth of depth exceeding the limit excavation depth 4.5m by the well point method as a conventional technology) by a pit machine (not shown) As the in-casing pipe is inserted into the deep well 10, the strainer 20 is made of stainless material is a perforated pipe having a pore for the ground water flow into the semi-permanent cylindrical pipe shape of lifespan ( Perforated pipe) and the gravel layer (11) to filter the shape of the pump to prevent the inflow of contaminated ground water to perform the protection function to increase the filtration efficiency to form the maximum screen porosity close to the maximum limit of the steel sheet desirable.

And the end of the pumping pipe 30 is provided in the hollow strainer 20 inside the water pump 31 of the high head is mounted to cover a part of the bottom of the deep well (core) 10 to cover the groundwater around the high depth Intensive aspiration and gathering force the groundwater to be drained to the ground.

In addition, the pump pipe 30 for forcibly draining the groundwater to the ground by the submersible pump 31 at the end is provided with a plurality of check valves (check valves) CV having a flow path blocking function as plumbing facilities to prevent backflow of groundwater. .

In addition, in the upper part of the deep well 10 having the strainer 20 having the pumping pipe 30, outside contaminants do not enter the deep well 10, and air is maintained in the well by maintaining airtightness. A cylindrical cover 14 is provided to prevent the vacuum effect from deteriorating and is installed to penetrate the inside of the deep well vertically to detect the level of the groundwater. The microprocessor of the controller 50, which is connected to the level sensor 60 and the vacuum gauge 41, is electrically connected to the controller 50, which will be described later, and is respectively equipped with a vacuum gauge 41 for measuring and displaying pneumatic pressure. By operating the submersible pump 31 and the vacuum pump 40a, 40b by the control of the groundwater level and vacuum pressure, the power is automatically shut off or the pressure is constantly adjusted. It is to control the ground water drainage device 100 in a manner that maintains the state.

In particular, the water level sensor 60 is installed at the set depth of the water level to measure the level of the groundwater, it is possible to control the device by determining the movement of the water level by sending the measured value as an electric signal to the controller.

In addition, one side of the upper surface of the deep well 10 is controlled by the controller 50, and any one of the ball valves BV1, BV2, and BV3 is selectively connected to each other by a channel opening / closing action. A vacuum suction pipe 42 is connected to the plurality of vacuum pumps 40a and 40b by a vacuum line and is introduced into the air flow path formed in the wall space between the strainer 20 and the pumping pipe 30 as an inner casing. It is

The vacuum pumps 40a and 40b are provided in plural to operate even in the event of a failure of the apparatus, so that only one of them is selectively operated as a control signal of the controller 50. The vacuum cleaner 70 in the form of a mesh screen during vacuum suction is Foreign matter is filtered to prevent foreign substances from entering the vacuum pumps 40a and 40b to generate negative pressure inside the groundwater vacuum drainage system of the deep wells. This allows more efficient groundwater drainage of high heads.

At this time, the well pipe assembly of the groundwater vacuum drainage device 100 provided with the submersible pump 31 of the present invention is located at a high depth below the ground water level h1, so that the submersible pump 31 at the bottom of the pump pipe 30 is provided. The catchment area surrounding the periphery is deepened, curved around the catchment part, and an underground water level line (h2) is formed to pump the groundwater to the submersible pump 31 and at the same time, the vacuum pumps 40a and 40b are well piped. Composite synergistic effect of forced pumping of groundwater, in which the vacuum pumps 40a and 40b and the submersible pump 31 are complementarily linked to each other by maintaining the vacuum of the well so as to reduce the atmospheric pressure so that atmospheric pressure does not work. As a result of the pumping, deep wells can be pumped by deep wells to realize the suction lift effect by vacuum suction, which maximizes the amount of pumped water and also expands the groundwater drainage area. Will.

In other words, the present invention uses the Suction Lift phenomenon in which the upper part of the deep well is sealed, the well wall functions as a cylinder, and the groundwater level functions as a piston, but the pressure in the well pipe is continuously lowered using a vacuum pump. The water level is increased by pumping the groundwater to the ground with a submersible pump while lowering the groundwater level in the state of maintaining the vacuum in the well. The filter layer is to prevent the incorporation of the strainer of the foreign matter mixed with the ground water.

As a result, the present invention increases the amount of pumped water compared to the conventional well point underground drainage method, which can be forced drainage using the vacuum effect, and the depth is limited to within 4.5 m. As a result, it is possible to drain in silt layer or general clay ground, which has poor water permeability compared to the conventional deep well drainage device with limited excavation scope. Excavation zones can be widely used without particularity, and the well effect is improved by the vacuum effect, compared to the groundwater drainage system of the deep well method, which has a poor well efficiency and requires several, so that the number of construction can be reduced. DRY WORK is possible at work and work efficiency is improved The soil improvement that will prevent large accidents in construction safety and construction quality of construction in the province will be in operation so that the excellent effect

The present invention described above is not limited to the above-described embodiment as various substitutions and changes can be made by those skilled in the art without departing from the technical idea of the present invention. .

1 is an exemplary view showing the configuration of the groundwater drainage device of the prior art (deep well method)

Figure 2 is a block diagram showing the overall configuration of the groundwater drainage device (vacuum deep well method) of the present invention

       Figure 3 is an exemplary view showing a state in which the vacuum deep well method groundwater drainage device of the present invention is installed on the ground

<Explanation of symbols for main parts of drawing>

1: Groundwater drainage 2: Deep well

3: gravel layer (filter) 4: pumping pipe

5: Submersible pump 6: Drain pipe

100: groundwater drainage

10: deep well 20: gravel layer (filter)

30: Pumping pipe 31: Submersible pump

32: drain pipe

40: vacuum pump 41: vacuum gauge

42: Vacuum line

60: water level sensor 70: cleaner

CV: Check Valve BV: Ball Valve

h1: original groundwater level h2: drainage groundwater level

Claims (2)

In order to prevent the collapse of the excavation surface by the water flowing out of the ground during various constructions such as the excavation work, the strainer 20 is an inner casing having a pump pipe 30 equipped with an underwater pump 31 at the end. It is a vertical well formed by forming a gravel layer (filter) 11 in the space between the well wall of the deep well 10 and the strainer 20, and digging the deep well 10 by operating the water pump 31. A pump drainage device for underground water level reduction, which pumps groundwater to the ground through a drain pipe 32 connected to 30).   One side of the upper side between the strainer 20 and the pumping pipe 30 located on the ground surface is controlled by the controller 50, and one of the ball valves BV is selectively connected to one another by opening and closing the flow path of the plurality of ball valves BV. The vacuum suction pressure of the vacuum pumps 40a and 40b is increased by connecting the vacuum suction pipes 42 connected to the plurality of vacuum pumps 40a and 40b to the pump discharge pressure of the high head submersible pump 31. Due to the well-composite effect of the complementary well, the pumping effect of draining the groundwater around the lower side of the high-depth pumping pipe 30, the groundwater level decreases and the influence range of the drainage device is expanded. In the vacuum pump drainage device for underground water level reduction accompanying the excavation construction of the configuration that can reduce the  A cylindrical cover 14 is provided on the deep well 10 to prevent external contaminants from entering the deep well 10 and to maintain a vacuum by maintaining airtight to prevent air from entering the well and deteriorating the vacuum effect. It is provided to form a deep well 10 in the form of a closed groundwater hole without a separate gap under the micropore strainer 20, The vacuum suction pipe 42 is provided with a cleaner 70 in the form of a dense mesh screen that filters foreign matters on the pipeline so that no contaminants from the outside or the ground flow into the well, and maintains a vacuum by maintaining airtightness in the well. Vacuum pump drainage device for underground water level reduction accompanying the excavation construction, characterized in that the construction to prevent the vacuum effect is lowered to significantly improve the pumping efficiency of groundwater delete

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