JP2010150887A - Existing pipe reconstruction jacking method and apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To smoothly deliver crushed pieces of an existing pipe to an arrival pit side without needing to crush the crushed pieces into finer pieces and moreover without clogging the existing pipe in delivering the crushed pieces of the crushed existing pipe to the arrival pit side through the remaining existing pipe. <P>SOLUTION: A cutter head 20 capable of crushing the existing pipe 50 is mounted to the tip of a leading pipe 22. The leading pipe 22 is provided with a main screw 18 for delivering sediment to a start pit, and a flexible screw 32 is connected to the cutter head 20 to serve as an auxiliary screw for delivering the crushed pieces of the existing pipe 50 using the remaining existing pipe 50 as a delivery path. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a reconstruction propulsion apparatus that renews an old buried pipe without excavation into a new buried pipe, and in particular, uses the existing pipe as a route for discharging chips generated when the existing pipe is crushed. The present invention relates to a method and apparatus for promoting the reconstruction of existing pipes.

Pipes that are buried underground as lifelines for water, sewage, gas, etc., are aged over time, and water leaks from the joints of the pipes in particular. Need to be updated. Generally, the useful life of 50 years is statutory, and it is renovated before this statutory life is exceeded.
In order to update such existing pipes, in the old days, existing pipes were excavated by excavating the buried parts from the ground surface, and new pipes were buried again. Recently, a renovation promotion method has been developed in which an existing pipe is crushed and a renewal pipe is promoted at the same time without cutting.
There are various conventional methods for promoting the reconstruction of existing pipes, but a typical construction method is a method of promoting an updated pipe while crushing the existing pipe with a cutter bit.

  The existing pipe to which the reconstruction promotion method is applied is a ceramic pipe, a fume pipe, or a plastic pipe made of vinyl chloride, etc. There are various types of tubes. Conventionally, it has been common to discharge the crushed pieces of the existing pipes to the starting side with screws.

  If the existing pipe is a ceramic pipe or a fume pipe, it can be said that it is suitable for crushing with a cutter bit because it is generally easy to crush, so that no major problem arises in the discharge on the starting and counter side with a screw. However, if the fragments are large, propulsion may not be possible without passing through the narrow conveying path of the screw.

  On the other hand, when existing pipes made of plastic such as vinyl chloride are cut with a cutter bit, chips that are continuous in a string form are generated. In addition, the chips accumulate in a bird's nest inside the existing pipe, and cannot be discharged even with a screw for earth removal. In particular, when rebuilding existing pipes made of plastic pipes such as vinyl chloride laid in clay soil, clay clogs between the chips, clumping the cutter blade, There was a risk that the promotion could not be continued.

Therefore, it has been studied to transfer the existing pipe itself to the reaching mine as a discharge path for fragments and chips. As a prior art of this type of reconstruction promotion construction method, for example, there is a reconstruction promotion construction method proposed in Patent Document 1.
This construction method is a construction method using a cutter head having a crushing blade for crushing an existing pipe in a reduced diameter direction. The crushing blade is pushed by a propulsion device, and the existing pipe is crushed and reduced in diameter by the taper of the crushing blade, so that the crushed pieces crushed to the reaching pit are discharged through the remaining existing pipe.
JP 2002-213651 A

  However, the construction method proposed in Patent Document 1 uses a cutter head having a special crushing blade for crushing and reducing the diameter of an existing pipe, so that the existing pipe can be crushed and crushed. However, it is not designed to excavate natural ground.

  Often, existing pipes to be remodeled meander with a large deviation from the design plan line. The existing pipe meanders up and down due to the weight of the vehicle when there is a road with a high traffic volume on a weak ground, in addition to the joint part rising or sinking due to the earthquake. May occur.

  In the case of repairing such a meandering existing pipe, a portion for crushing the existing pipe and a portion for excavating a natural mountain portion instead of the existing pipe are alternately continued. For this reason, the object to be excavated changes as the propulsion proceeds, and the section for crushing the existing pipe portion and the section for excavating the natural ground, that is, the ground portion, are intermittent.

The above-described method disclosed in Patent Document 1 cannot be used for repairing existing pipes meandering in this manner. This is because the crushing blade used in this method does not have the function of excavating the ground itself, even though the existing pipe can be crushed and reduced in diameter. As described above, discharging the crushed pieces through the pipe is advantageous in the case of an existing pipe that does not become a fine fragment, such as when a soft pipe such as vinyl chloride is crushed. However, in the construction method of Patent Document 1, since the discharge of the crushed pieces depends exclusively on the pressing by the crushed blade, the crushed pieces become a lump and the discharge property tends to be lowered. For this reason, it closes immediately and cannot continue digging.

  Therefore, the object of the present invention is to eliminate the above-mentioned problems of the prior art, and it is not necessary to crush the crushed pieces finely when discharging the crushed pieces of the existing pipes that have been crushed through the remaining existing pipes to the access shaft side. An object of the present invention is to provide an existing pipe reconstruction propulsion device that can smoothly discharge the existing pipe to the arrival shaft without clogging the existing pipe.

  In addition, another object of the present invention is that even if a part of the existing pipe to be remodeled is a renovation work that is significantly displaced from the original design plan line due to meandering, the existing pipe part and the ground part Without distinguishing (ground), the existing pipe renovation propulsion method that enables efficient excavation while discharging fragments and earth and sand to the arrival mine side through the existing pipe remaining using a normal cutter head It is to provide.

  In order to achieve the above-mentioned object, the present invention provides a method for promoting the rebuilding of an existing pipe, in which an existing pipe buried in the ground is crushed with a cutter head, and at the same time, a new renewal pipe is pushed with a leading pipe to be preceded. A propulsion device that has a cutting head cut at the start end position of the existing pipe, a cutter head capable of crushing the existing pipe at the tip of the front pipe, and a main screw that discharges earth and sand to the start pipe in the front pipe And connecting the auxiliary screw for discharging the fragment to the cutter head to use the remaining existing tube as a discharge path. The process of extending the existing pipe to the reaching shaft provided at the end position of the existing pipe, and rotating the cutter head and the auxiliary screw together with the main screw, do not crush the existing pipe. By promoting et update pipe by the propulsion device and is characterized a step of renovation the existing pipe to update tubes, that consist.

  Further, the present invention is an existing pipe renovation propulsion device that pushes a new renewal pipe together with a leading pipe to be preceded while crushing an existing pipe buried in the ground with a cutter head, and can crush the existing pipe. A cutter head is attached to the tip of the leading conduit, and a main screw is provided in the leading conduit for discharging the earth and sand to the starting resistance, and a screw having flexible flexibility is discharged from the existing conduit where the crushed pieces of the existing conduit remain. The auxiliary screw for discharging as a path is connected to the cutter head.

  In the present invention, as the auxiliary screw for discharging the crushed pieces, an existing flexible screw having a blade having a pitch opposite to that of the main screw and a screw shaft whose shaft is divided into movable nodes is used. It is possible to renovate existing pipes that meander while alternately crushing the pipes and excavating the ground.

  According to the present invention, in order to discharge the fragments of the existing pipes crushed through the remaining existing pipes to the arrival shaft side, it is not necessary to crush the fragmented pieces finely and smoothly without clogging the existing tubes. Can be discharged.

  In addition, according to the present invention, without distinguishing between the existing pipe portion and the natural ground portion (ground), the crushed pieces and earth and sand are discharged to the reaching mine side through the existing pipe remaining using the normal cutter head. You can dig efficiently.

Hereinafter, an embodiment of an existing pipe reconstruction promotion method and apparatus according to the present invention will be described with reference to the accompanying drawings.
In FIG. 1, reference numeral 10 indicates the entire propulsion unit that implements the reconstruction promotion method for existing pipes. As this propulsion device 10, a well-known propulsion device widely used in a construction method for propelling a buried pipe in the ground without non-cutting is used. Reference numeral 50 is an aging existing pipe. In FIG. 2, reference numeral 60 indicates an update tube. The update pipe 60 is, for example, a fume pipe.

A shaft 12 (hereinafter referred to as a start shaft) is excavated at the start position of the renewal pipe 60, and the propulsion device 10 is carried into the start shaft 12.
In the propulsion device 10, the propulsion device main body is movably installed on a guide frame 15 serving as a base. Hydraulic cylinders 16 that generate thrust to push the renewal pipe 60 are disposed on the left and right sides of the propulsion unit main body. The tip of the piston rod of the hydraulic cylinder 16 is fixed to the reaction force receiver 17.

  The following attachments are connected to the main body of the propulsion device 10. That is, the attachment includes a screw 18 having a spiral blade extending in the axial direction, a cutter head 20 attached to the tip of the screw 18, an update pipe 60 that is added one by one, and a leading conduit 22. ing.

  The screw 18 is accommodated coaxially in the casing 21 inside the renewal pipe 60, and the drive torque of the hydraulic motor 19 provided in the propulsion device 10 is transmitted to the screw 18 through a hollow speed reducer (not shown). At the same time, the thrust generated by the hydraulic cylinder 16 from the propulsion device 10 is applied to the update pipe 60. The renewal pipe 60, the casing 21, and the screw 18 are propelled while adding one by one as the propulsion is extended.

  The leading conduit 22 is connected to the tip of the leading update tube 60. A blade ring 23 is fixed to the tip of the tip conduit 22. The cutter head 20 is connected to the screw 18 and is rotatably supported by a bearing 24, and rotates integrally with the screw 18.

  The main body of the cutter head 20 includes a disk-shaped face plate 25. As shown in FIG. 3, a required number of cutters 26 are attached to the front surface of the face plate 25 at predetermined positions so as to cope with both excavation of the ground and crushing of the buried pipe 50. Moreover, the opening part 29 which takes in earth and sand is opened to the face plate 24 in two symmetrical positions. Note that the opening 29 may be three or four.

  The blade ring 23 is attached to the leading conduit 22 so as to be tiltable, and the direction of the cutter head 20 can be forcibly corrected by the hydraulic cylinder 30. A plurality of hydraulic cylinders 30 are arranged such that there are four symmetrically by 90 °, or three symmetrically by 120 °.

  Next, in FIG. 1, reference numeral 32 indicates an auxiliary screw for discharging shredded pieces attached so as to extend forward from the cutter head 20. The auxiliary screw 32 is a screw that conveys the crushed pieces generated when the existing pipe 50 is crushed by the cutter head 20 using the remaining existing pipe 50 as a discharge path. The base end of the auxiliary screw 32 is connected to the face plate 25 of the cutter head 20 so as to be coaxial with the screw 18.

  In this embodiment, the auxiliary screw 32 for discharging shredded pieces has a flexible structure in which the entire screw is bent by connecting the divided movable nodes in series with a pin. The movable node of the auxiliary screw 32 is a unitary movable node in which the blade and the shaft corresponding to the lead length of the blade are integrated, and these are connected to form one screw. In relation to the screw 18 which is the main screw, the blade of the auxiliary screw 32 has a reverse pitch relationship with the blade of the screw 18. Therefore, the screw 18 and the auxiliary screw 32 rotate in the same direction, but mainly the earth and sand are discharged backward, that is, toward the start shaft 14 by the screw 18, and the crushed pieces of the existing pipe 50 are remaining by the auxiliary screw 32. Is discharged to the front, that is, toward the reaching shaft.

The existing pipe reconstruction propulsion apparatus according to the present embodiment is configured as described above. Next, the process of the reconstruction promotion method implemented by the existing pipe reconstruction promotion apparatus will be described in order.
First of all, existing pipes approaching the statutory useful life and still extending along the original design plan line, which is still buried, that is, straight with the original installation state without meandering. The extension promotion method will be explained when the pipe itself is an aging existing pipe.
In FIG. 1, the start stand 12 is cut at the start end position of the existing pipe 50 to be remodeled. The propulsion device 10 is carried into the start shaft 12. In addition, although the reaching shaft 14 is required at the terminal position, in this embodiment, the existing manhole is used for the reaching shaft 14 without cutting the reaching shaft 14. When an existing manhole or the like cannot be used, the reaching shaft 14 is excavated.

  The tip of the auxiliary screw 32 is added until it reaches the reach shaft 14 through the existing pipe 50. As shown in FIG. 1, the base end portion of the auxiliary screw 32 is connected to the cutter head 20. The cutter head 20, the blade ring 23, the tip conduit 22, and the screw 18 are assembled by attachment and connected to the propulsion device 10.

  Therefore, the cutter head 20 is rotated by the propulsion device 10 and the piston rod of the hydraulic cylinder 16 of the propulsion device 10 is extended while the existing pipe 50 is crushed by the cutter 26 to push the leading conduit 22. The extension pipe 60, the screw 18, and the casing 21 are sequentially pushed forward without being extended while the advancement of the leading conduit 22 is extended. On the other hand, in parallel with the above-described addition, the renewal pipe 60 is promoted while removing the movable node at the tip of the auxiliary screw 32 on the reach shaft 14 side.

  In FIG. 2, when the existing pipe 50 is crushed by the cutter head 20, the earth and sand that has been dug accompanying the crushing of the existing pipe 50 at this time is taken into the screw 18 side from the opening 29 of the cutter head 20. Then, the rotation of the screw 18 causes the casing 21 to be transported rearward and is discharged to the start shaft.

  On the other hand, the existing pipe 50 is a sewer pipe having a large diameter in the case of this embodiment, and the crushed pieces thereof become a considerably large lump, and are not taken in from the opening 29 of the cutter head 20, so It will be crushed and fall in front of. The auxiliary screw 32 rotates integrally with the cutter head 20, and the auxiliary screw 32 has a blade having a pitch opposite to that of the screw 18, so that the crushed pieces of the existing pipe 50 remain by the auxiliary screw 32. The existing pipe 50 is used as a conveyance path and is efficiently carried out to the reaching shaft 14. The existing pipe 50 is a pipe having a large diameter, and even if it is a large crushed piece, it does not need to be finely pulverized and can be easily discharged without concern about blockage.

  In addition, in the cutter head 20, as shown in FIG. 4, the opening 29 of the head face plate 25 is made into a lattice type, and only the earth and sand are allowed to pass through, so that the passage of the crushed pieces of the existing pipe 50 can be reliably prevented. It is good also as a mouth. Further, the opening 29 itself of the face plate 25 may have a small diameter so that the passage of the crushed pieces is disabled.

  The above has been described by taking an example of a large-sized pipe that is easily crushed, such as concrete, but the existing pipe 50 includes various pipes, for example, the existing pipe 50 made of a soft material made of resin such as vinyl chloride. There is also. When a pipe made of vinyl chloride is crushed by the cutter head 20, generally, the chips are not cut short and often become long chips that are continuous in a string shape.

  In the case of earth and sand, especially clay, the chips become large lumps and block the opening 29 of the face plate 24 when the clay is clogged in the gaps between the chips. If this happens, there is a problem in the discharge by the screw 18, and there is a possibility that the propulsion may become impossible in some cases.

  On the other hand, in the reconstruction propulsion method using the reconstruction propulsion apparatus according to the present embodiment, the auxiliary screw 32 extending from the cutter head 20 toward the reaching vertical shaft 14 is provided. The debris is immediately discharged forward, and the problem of blockage does not arise.

  The above is an example of renovation of an existing pipe that does not meander and extends straight without any meandering, even if it is close to the legal service life. A method of repairing an existing pipe that has caused meandering due to a load, etc. will be described.

  FIG. 5 is a diagram illustrating a situation where an old existing pipe is meandering. In this example, the existing pipe 50 is buried as a sewer pipe in a place where the ground is weak, and there is a road with a lot of traffic on the ground surface. Reference numeral 80 is a manhole. In such a situation, the joint portion 50a of the existing pipe 50 may be lifted or sunk while being bent by receiving a load constantly. The portion of the joint portion 50a in which the existing pipe 50 has sunk is clogged due to a poor flow, and the need for reconstruction is still greater.

  And if the repair area of the existing pipe 50 is taken as a whole, the existing pipe 50 is in a state of extending while being raised and lowered in a zigzag manner. In addition, the position of the pipe | tube at the time of embedding is shown with the broken line in the figure.

  The construction method of the present invention can be applied to the reconstruction of the existing pipe 50 in a meandering state in the same manner as the existing pipe 50 without the meandering described above.

  In the same manner as in the straight case of FIG. 2, the propulsion device 10 is carried into the starting shaft 12, and the auxiliary screw 32 is added until the tip of the auxiliary screw 32 reaches the reaching shaft 14 through the existing pipe 50. The proximal end portion of the auxiliary screw 32 is connected to the cutter head 20, and the cutter head 20, the blade edge ring 23, the tip conduit 22, and the screw 18 are attached and assembled to be connected to the propulsion device 10.

  Therefore, the cutter head 20 is rotated by the propulsion device 10 and the piston rod of the hydraulic cylinder 16 of the propulsion device 10 is extended while the existing pipe 50 is crushed by the cutter 26 to push the leading conduit 22. The extension pipe 60, the screw 18, and the casing 21 are sequentially pushed forward without being extended while the advancement of the leading conduit 22 is extended. On the other hand, in parallel with these additions, the renewal pipe 60 is propelled while removing the movable node at the tip of the auxiliary screw 32 on the reach shaft 14 side.

  In the renovation of the existing pipe 50 in such a state that the joint portion 50a is sunk in a meandering manner, as shown in FIG. 5, if the renewal pipe 60 is to be propelled straight, mainly the ground, that is, the ground The reconstructed section A for excavating the portion and the reconstructed section B mainly for crushing the existing pipe 50 appear alternately.

First, the propulsion in the reconstructed section B where the existing pipe 50 is mainly crushed will be described.
In FIG. 6, when the existing pipe 50 is crushed by rotating the cutter head 20, the earth and sand excavated accompanying the crushing of the existing pipe 50 at this time is taken into the screw 18 side from the cutter head 20, and the screw The rotation of 18 causes the casing 21 to be transported backward using the transport path and is discharged to the start shaft 12.

  Further, since the auxiliary screw 32 for discharging the crushed pieces of the existing pipe 50 has flexible flexibility by being divided into movable nodes, even if the existing pipe 50 is bent as shown in FIG. Since the existing pipe 50 can be rotated while being bent following the zigzag pipe line of the existing pipe 50, the crushed pieces of the existing pipe 50 are smoothly discharged to the reach shaft 14 using the remaining existing pipe 50 as a conveyance path.

  Next, in the renovation section A, where excavation of the ground is the main, the normal head normally used for the renovation of the renewal pipe is used for the cutter head 20, so the ground is excavated without any trouble, and the earth and sand is the cutter head. It is taken in behind 20 and is discharged to the start shaft 12 by a screw 18.

  As described above, since the meander is meandering, the section of the existing pipe 50 that is mainly crushed and the section of the ground that is mainly excavated are alternately renovated. It can be carried out efficiently. The meandering examples shown in FIGS. 5 and 6 are examples of undulations up and down. However, when a fault is caused by an earthquake, the meandering may bend while meandering left and right. An existing pipe that has become such a situation can be remodeled in the same manner as an existing pipe meandering up and down.

It is sectional drawing which shows the propulsion apparatus which implements the existing pipe reconstruction promotion construction method by this invention, has carried the propulsion apparatus to the starting shaft, and connected the attachment. It is sectional drawing which shows the propulsion apparatus which implements the existing pipe reconstruction promotion construction method by this invention, and shows the condition in the middle of propelling an update pipe. It is a front view of the cutter head of a propulsion machine. It is a front view which shows the modification of the face plate of a cutter head. It is a figure explaining the condition where a buried pipe meanders. It is sectional drawing which shows the condition applied to the buried pipe which meanders the existing pipe reconstruction promotion back by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Propulsion machine 12 Starting shaft 14 Reaching shaft 16 Hydraulic cylinder 18 Screw 20 Cutter head 22 Lead pipe 25 Face plate 26 Cutter 32 Auxiliary screw 50 Existing pipe 60 Update pipe

Claims (7)

In the reconstruction promotion method for existing pipes, the existing pipes buried in the ground are crushed with the cutter head, and at the same time, a new renewal pipe is promoted together with the leading pipe to be preceded.
A propulsion device that has a cutting head cut at the start end position of the existing pipe, a cutter head capable of crushing the existing pipe at the tip of the front pipe, and a main screw that discharges earth and sand to the start pipe in the front pipe Installing in the start-up response;
In order to use the crushed pieces of the existing pipe by the cutter head as the discharge path of the remaining existing pipe, an auxiliary screw for discharging the crushed pieces is connected to the cutter head and the inside of the existing pipe is provided at the end position of the existing pipe. The process of extending to a new shaft,
Along with the main screw, the cutter head and the auxiliary screw are rotated, and the existing pipe is propelled by the propulsion device while crushing the existing pipe, thereby remodeling the existing pipe to the update pipe;
A method for promoting the reconstruction of existing pipes.   As the auxiliary screw for discharging the crushed pieces, the existing pipe is crushed by using a flexible screw having a blade having a pitch opposite to that of the main screw and a screw shaft whose shaft is divided into movable nodes. The existing pipe reconstruction promotion method according to claim 1, wherein the existing pipe meandering is reconstructed while excavating the ground portion alternately.   The existing pipe reconstruction propulsion method according to claim 2, wherein a cutter head of a type that combines excavation of the ground and crushing of the buried pipe is used as the cutter head.   2. The existing pipe according to claim 1, wherein the cutter head uses a cutter head having an intake port that allows only earth and sand to pass through the head face plate and prevents passage of the crushed pieces of the existing pipe. Reconstruction promotion method. In the existing pipe renovation propulsion device that crushes the existing pipe buried in the ground with the cutter head and simultaneously pushes the new renewal pipe together with the leading pipe to be preceded,
A cutter head capable of crushing the existing pipe is attached to the tip of the leading pipe, a main screw is provided in the leading pipe for discharging the earth and sand to the starting resistance, and a screw having flexible flexibility is attached to the crushing piece of the existing pipe. An existing pipe reconstruction propulsion device, wherein the remaining existing pipe is connected to the cutter head as an auxiliary screw for discharging the remaining existing pipe as a discharge path.   6. The existing pipe reconstruction propulsion device according to claim 5, wherein the auxiliary screw for discharging the shredded pieces includes a screw having a blade having a pitch opposite to that of the main screw and divided into movable nodes.   6. The existing pipe remodeling promotion according to claim 5, wherein the cutter head has a mesh-shaped intake port that allows only the earth and sand to pass therethrough and prevents passage of the crushed pieces of the existing pipe on the head face plate. apparatus.

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