JP3628082B2 - Water stop structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a water stop structure for preventing groundwater from flowing out of the ground through a connecting portion between a pair of pipes inserted into the ground and connected to each other in order to perform a pipe roof construction method.
[0002]
[Prior art]
In order to carry out the pipe roof construction method, for example, a plurality of pipes are inserted into the ground from the starting shaft to the reaching shaft, thereby arranging a plurality of pipe rows parallel to each other. The end of each pipe row protrudes to the start shaft and the reach shaft for support by later support works. Two pipes adjacent to each other are provided with a female joint extending in the longitudinal direction and a male joint received in the female joint, and are connected to each other by both joints.
[0003]
By the way, in the ground where the groundwater level is high, when a plurality of pipes in the first row are inserted into the ground and a pipe in the second row is inserted into the ground, the male joint of the pipe in the second row accepts the groundwater. The female joints of the pipes in the first row are guided into the start shaft as a water conduit. This groundwater is not led to the end of the first row of pipes protruding into the start shaft, but between the female joint and the male joint in the vicinity of the retaining wall defining the wall of the start shaft and It erupts from its surroundings. Such a groundwater ejection phenomenon also occurs in the reaching shaft, and also occurs when a pipe is inserted from a retaining wall into a natural ground without constructing the starting shaft or the reaching shaft.
[0004]
In order to stop the ejection of groundwater, it is conceivable to pad the space defined by the female joint and the male joint near the wall of the retaining wall. However, the cross-sectional shape of the space defined by the female joint and the male joint is complicated, and it is not easy and practically impossible to fill the space without any gaps.
[0005]
[Problems to be solved by the invention]
An object of the present invention is to provide a first pipe that is inserted into the ground leaving an end portion and a second pipe that is inserted into the ground in parallel with the first pipe in order to perform the pipe roof construction method. The purpose is to prevent the outflow of groundwater from the interconnected female joint and male joint.
[0006]
[Means for Solving the Problems]
The present invention includes a first pipe that is passed through a retaining wall and is disposed in the ground leaving an end thereof in order to perform a pipe roof construction method, and a second pipe that is disposed in the ground in parallel with the first pipe. A female joint extending in the longitudinal direction of each of the first pipe side and the second pipe side and a male joint received by the female joint. A water stop structure for preventing groundwater from flowing out, a concrete block formed in the earth retaining wall and having a hole allowing insertion of the second pipe, an end of the first pipe, and the first pipe A pair of cover plates that are spaced apart from each other and fixed to the first pipe and cover the female joint and the male joint, and are liquid-tight to the concrete block A pair of cover plates having one end face fixed A plurality of linear bodies implanted in the pair of cover plates and extending toward the other cover plate, a seal member attached to each cover plate and capable of being in close contact with the second pipe, and the pair A cap member made of an elastic material that is in close contact with the other end surface of the cover plate and close to the second pipe, and has a groove that allows liquid-tight insertion of the male joint of the second pipe A member and a non-water-permeable viscous material filled between the pair of cover plates.
[0007]
Operation and effect of the invention
According to the present invention, with respect to the end portion of the first pipe and the end portion of the second pipe inserted into the ground, a pair of cover plates surrounds the female joint and the male joint that connect both pipes. It is covered and both ends of both cover plates are closed by the concrete block and the cap member. The impermeable viscous substance filled between the cover plates is held between the cover plates by a large number of linear bodies, and the second pipe and the both are sealed by a pair of seal members attached to the cover plates. Leakage from the cover plate is prevented. The groove of the cap member is in liquid-tight contact with the male joint of the second pipe during propulsion for insertion of the second pipe into the ground, and the cap is in contact with the second pipe. Liquid-tight contact with part of the peripheral surface.
[0008]
Therefore, the ground water that enters and moves into the female joint is blocked by the cap member both when the second pipe is inserted into the ground and after the insertion. Leakage from the joints is stopped. This completely prevents outflow of groundwater from the ground during and after the insertion of the second pipe.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
In order to implement the pipe roof method, which is one of the methods for forming tunnels, basements, and other spaces in the ground, multiple rows of parallel pipes from the starting shaft to the reaching shaft are arranged in the ground. The Alternatively, a plurality of parallel pipes penetrating the retaining wall are arranged in the ground without constructing the starting shaft or the reaching shaft. The pipes in each row arranged in the ground are composed of a plurality of pipes, and adjacent pipe rows are connected to each other via a female joint provided in advance in the pipe and a male joint received therein.
[0010]
The plurality of pipes in each row are sequentially propelled into the ground using a propulsion device such as a hydraulic jack. More specifically, the plurality of pipes in each row are sequentially propelled in the ground following the shield type excavator propelled in the ground under the propulsive force of the propulsion device.
[0011]
1 to 3 show a part of a first pipe row 12 composed of a plurality of pipes propelled from the starting shaft into the ground 10 and a second pipe row 14 adjacent to the first pipe row 12. A part and a part of the start shaft 16 are shown.
[0012]
The first pipe row 12 reaches the reaching shaft (not shown) from the starting shaft 16, while the second pipe row 14 has not yet reached the reaching shaft from the starting shaft 16.
[0013]
The start shaft 16 is provided with a retaining wall 18 formed of concrete, a steel sheet pile or the like that substantially defines the pit wall. The retaining wall 18 has two holes through which both pipe rows pass (however, only the holes 20 for the second pipe row 14 are shown in the figure). A concrete block 28 provided with two start pits 24 and 26 is installed on the retaining wall 18. Both start pits 24 and 26 of the concrete block 28 are respectively aligned with both holes of the retaining wall 18, and the pipes 12 and 14 of the pipes 12 and 14 pass through these start pits 24 and 26 and the holes of the retaining wall 18. Propelled in 10th.
[0014]
The rearmost pipe 30 in the first pipe row 12 in the propulsion direction protrudes from the well opening 24 of the concrete block 28 so that the end (rear end) 31 remains in the start shaft 16. Similarly, for the second pipe row 14, the end of the rearmost pipe (not shown) is left in the start shaft 16. Moreover, the end part (front end part) of the foremost pipe of the pipes in each row is also set to be in the reach shaft. The end of each row of pipes extending through each shaft is utilized for support by a supporter installed later in the shaft. When the pipes are installed in the ground without providing the starting shaft or the reaching shaft, the ends of the pipes in each row are made of concrete blocks provided on the earth retaining wall for preventing the collapse of natural ground. Protruding.
[0015]
Each pipe of the first pipe row 12 has a pair of female joints 32 and 34 extending in the longitudinal direction on both sides of the pipe. On the other hand, each pipe of the second pipe row 14 has a male joint 36 and a female joint 38 extending in the longitudinal direction on both sides of the pipe. The male joint 36 of the second pipe is partially connected to one female joint 32 of the first pipe row 12 when each pipe of the second pipe row 14 is inserted into the starting port of the concrete block 28. As the propulsion progresses, the whole is received by the female joint 32, whereby each pipe of the second pipe row 14 is connected to each pipe of the first pipe row 12. The other female joint 34 of the first pipe row 12 is used for connection with the same pipe row as the second pipe row 14 that is disposed on the left side of the first pipe row 12 later. The female joint 38 of the second pipe row 14 is also used for connection to a pipe row similar to the second pipe row 14 that is disposed on the right side of the second pipe row 14 later.
[0016]
Each of the illustrated female joints 32, 34, and 38 is formed by arranging a pair of angle steels at intervals in the circumferential direction of the pipe so that the inner corners thereof are opposed to each other. The male joint 36 is formed by arranging a pair of angle steels at intervals in the circumferential direction of the pipe so that the outer corner portions thereof face each other.
[0017]
When the pipe roof method is applied to a ground having a relatively high groundwater level, groundwater in the ground flows through each female joint as a water conduit and flows into the start shaft 16. In order to prevent this, the water stop structure of the present invention is applied to the female joint 32 and the male joint 36 that are engaged with each other, and the female joint 34, which is in a non-engaged state with the male joint, As for No. 38, a filling 40 made of a foamed plastic material, a water-insoluble viscous substance (oil-based clay, konjac, putty) or the like is disposed in each female joint. The filling 40 also prevents intrusion of earth and sand into the female joint when the pipe is propelled. The filling 40 is broken or compressively deformed when the male joint is inserted into the female joint in which it is arranged. The water stop structure of the present invention stops the groundwater flowing through the female joint after the filling 40 is destroyed and removed by insertion of the male joint or after being compressed and deformed.
[0018]
The water stop structure of the present invention is the rearmost pipe in the propulsion direction of the first pipe row 12, that is, a pipe (hereinafter referred to as “first pipe”) 30 installed with the end portion left on the start shaft 16. Applied to each pipe (hereinafter referred to as “second pipe”) 42 that is propelled in sequence and constitutes the second pipe row 14, and between the concrete block 28 and the first and second pipes 30, 42. A pair of cover plates 44 that are arranged and extend substantially horizontally in the longitudinal direction of the pipes 30 and 42 so as to cover the female joint 32 and the male joint 36 of both pipes, and the cover plates 44 respectively. A large number of linear bodies 46 that are implanted and extend toward the other cover plate 44, a seal member 48 attached to each cover plate 44, a cap member 50, and a space between both cover plates 44 And a water-impermeable gum 52.
[0019]
The concrete block 28 includes a block portion 54 formed previously for propulsion of the first pipe row 12, and a block portion 56 formed thereafter and connected to the block portion 54 for propulsion of the second pipe row 14. Consists of. Reference numerals 58 and 60 shown in FIG. 2 denote a rectangular tube that is used as a part of a mold for forming the block portion 56, one end of which is fixed to the earth retaining wall 18, and the rectangular tube The lid having a hole 62 that closes the other open end and allows the second pipe 42 to pass therethrough is shown.
[0020]
The pair of cover plates 44 are liquid-tightly fixed to the side surface of the first pipe 30 at one side portion 64 (FIG. 3). In addition, both the cover plates 44 are welded to the lid 60 of the formwork at one end face 66 thereof, thereby being substantially liquid-tightly fixed to the concrete block 28. Each cover plate 44 is reinforced by a plurality of ribs 67 fixed to the first pipe 30.
[0021]
The many linear bodies 46 are made of plastic or metal. A large number of linear bodies 46 extending from each cover plate 44 preferably have a length dimension reaching the female joint 32 and the male joint 36, in the example shown, the length reaching one angle steel constituting each of the joints. It has a size. These many linear bodies 46 hold the viscous material 52 between them so that they do not flow between the cover plates 44.
[0022]
Each seal member 48 is elastically deformed into a U shape when viewed in cross section, and one side portion thereof is fixed to the other side portion 68 of each cover plate 44 and extends in the longitudinal direction along the other side portion. The other side of each seal member 48 can be in close contact with the side surface of the second pipe 42, that is, can be in liquid-tight contact. Both seal members 48 are in contact with the peripheral surface of the second pipe following the vibration or movement of the second pipe that occurs during propulsion into the ground, and between the cover plates 44 and the second pipe 42. The leakage of the viscous material 52 from the second pipe is prevented, and the contact of the second pipe with the cover plates 44 is prevented.
[0023]
The cap member 50 is made of a block made of an elastic material such as rubber, and has an end surface 72 that covers the other end surfaces 70 of both cover plates 44. In the illustrated example, the other end surfaces 70 of both cover plates 44 are disposed so as to slightly protrude from the end surface 30 a of the first pipe 30. For this reason, one end surface 72 of the cap member 50 in the illustrated example includes an end surface portion 74 that is in close contact with the other end surfaces 70 of both cover plates, and an end surface portion 76 that is in contact with a part of the end surface 30 a of the first pipe 30. . Instead of the illustrated example, the other end faces 70 of both cover plates 44 can be set to be flush with the end face 30a of the first pipe 30, or the other end face 70 can be set not to protrude from the end face 30a. Accordingly, the shape of the cap member 50 can be changed so that the one end surface 72 of the cap member 50 is in liquid-tight contact with at least the other end surfaces 70 of both cover plates.
[0024]
The cap member 50 also has a cylindrical surface 75 that can be brought into intimate contact with the side surface of the second pipe 42, and a cap member 50 that extends in the longitudinal direction and opens at both end surfaces 72 and 73 and is released to the cylindrical surface 75. Two grooves permitting liquid-tight insertion of the male joint 36 of the two pipes 42, in the illustrated example, a cross-sectional shape of a chevron substantially equal to the cross-sectional shape of the two chevron steels constituting the male joint 36 Having two grooves 77. The cylindrical surface 75 and the groove 77 are in fluid-tight contact with the peripheral surface of the second pipe and its male joint 36 while propelling the second pipe into the ground, and the viscous material from between the contact portions 52 and prevent water leakage.
[0025]
The cap member 50 includes a pair of cover plates 44 and the first pipe 30 via a holding plate 78 in contact with the end surface 73 and a plurality of bolt / nut assemblies 80 for fastening the holding plate 78 to the ribs 67. It is pressed against the tube end. The holding plate 78 has a notch 78 a that allows the male joint 36 to move when the second pipe 42 is propelled.
[0026]
The viscous material 52 disposed in the space defined by the cover plates 44 and the seal members 48, the concrete block 28 and the cap member 50 and surrounding the joints 32 and 36 is made of grease in the illustrated example. The viscous material 52 adheres to the peripheral surface of the second pipe 42 to be propelled, and the amount thereof gradually decreases. In order to compensate for this amount, an inlet 81 for replenishing the viscous material 52 to the upper cover plate 44 is provided.
[0027]
According to this water stop structure, both when the second pipe is propelled into the ground and after the second pipe is propelled into the ground as shown in FIG. The underground water is blocked by the movement of the groundwater entering the female joint 32 in the ground toward the start shaft 16 and the viscous material 52 surrounding the female joint 32 and the female joint 36 received by the female joint 32. The overflow of the groundwater from within the female joint 32 accompanying the damming is prevented. As a result, ejection of the groundwater into the start shaft 16 is prevented.
[0028]
In the illustrated example, a sponge sheet is used to prevent water leakage from between the second pipe 42 and the wellhead 26 of the concrete block 28 and to allow the second pipe 42 to move smoothly through the wellhead 26. 82 is embedded in the concrete block 28. A part of the sheet 82 covers the periphery of the second pipe 42 and the periphery of a part of both the cover plates 44.
[0029]
4 to 9 show other examples of the female joint 32 provided on the first pipe 30 and the male joint 36 provided on the second pipe 42. Each of the female joints 32 shown in FIGS. 4, 5, and 6 has a C-shaped cross-sectional shape. The male joint 36 shown in FIGS. 4, 5 and 6 has a T-shaped, circular, I-shaped and C-shaped cross-sectional shape. The female joint 32 shown in FIGS. 7 and 8 has a cross-sectional shape similar to that shown in FIG. 2, and the male joint 36 has a cross-sectional shape similar to that shown in FIGS. Have. The female joint 32 and the male joint 36 shown in FIG. 9 have C-shaped and I-shaped cross-sectional shapes, respectively. The groove provided in the cap member through which the male joint of these examples is passed has substantially the same shape as the outer shape of the male joint. In addition, the circular part of the male joint 36 shown in FIG. 6 and FIG. 8 is closed with a plate material at both end faces to prevent intrusion of earth and sand.
[0030]
The water stop structure according to the present invention can also be applied to a reaching shaft, and in the same manner as in the starting shaft, it is possible to prevent the flow of ground water from the connecting portion between both pipes to the reaching shaft. In addition, the present invention can be applied to prevent the outflow of groundwater from the connecting portion of both pipes that are installed in the ground through the retaining wall without providing the starting shaft or the reaching shaft. it can.
[Brief description of the drawings]
FIG. 1 is a front view of a water stop structure according to the present invention as viewed from a pipe end of a first pipe.
FIG. 2 is a cross-sectional view taken along line 2-2 of FIG.
3 is a cross-sectional view taken along line 3-3 of FIG.
FIG. 4 is a cross-sectional view of another example of a female joint and a male joint.
FIG. 5 is a cross-sectional view of another example of a female joint and a male joint.
FIG. 6 is a cross-sectional view of another example of a female joint and a male joint.
FIG. 7 is a cross-sectional view of another example of a female joint and a male joint.
FIG. 8 is a cross-sectional view of another example of a female joint and a male joint.
FIG. 9 is a cross-sectional view of another example of a female joint and a male joint.
[Explanation of symbols]
16 Starting shaft 18 Retaining wall (mine wall)
28 Concrete block 30 First pipe 32 Female joint 36 Male joint 42 Second pipe 44 Cover plate 46 Linear body 48 Seal member 50 Cap member 52 Viscous substance 76 Groove

Claims (1)

In order to carry out the pipe roof construction method, a first pipe that is passed through a retaining wall and is disposed in the ground with an end portion thereof, and a second pipe that is disposed in the ground in parallel with the first pipe Groundwater outflow from between a female joint that is provided and extends in the longitudinal direction on the side of the first pipe and the side of the second pipe, and a male joint received in the female joint. A water blocking structure for blocking, a concrete block formed in the earth retaining wall and having a hole that allows insertion of the second pipe, an end portion of the first pipe, and a second pipe A pair of cover plates that are spaced apart from each other and are fixed to the first pipe and cover the female joint and the male joint, and are liquid-tightly fixed to the concrete block. A pair of cover plates having one end face, and the one A large number of linear bodies that are implanted in the other cover plate and extend toward the other cover plate, a seal member that is attached to each cover plate and can be brought into close contact with the second pipe, and the pair of cover plates A cap member made of an elastic material in close contact with the other end surface of the second pipe and having a groove that allows liquid-tight insertion of the male joint of the second pipe; A water-stop structure including a water-impermeable viscous material filled between the pair of cover plates.

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