JPH0972189A - Cut-off construction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the flowout of underground water from both joints by having a pair of cover plates fixed to a fist pipe and covering both female and male joints and a cap member provided with a groove allowing liquid-tight insertion of the male joint of a second pipe. SOLUTION: The circumferences of a female joint 32 and a male joint 36 are covered with a pair of cover plates 44, both ends of the cover plates 44 are closed with a cover body 60 and a cap member 50, a viscous substance 52 with non-water permeability is held by a large number of linear bodies 46 between both cover plates 44, and the leakage of ground water from between a second pipe and both cover plates 44 is prevented by a pair of sealing compounds. Then, a groove 77 of the cap member 50 is brought into contact with the male joint 36 of the second pipe is a liquid-tight state, ground water entered in the female joint 32 and moving it is dammed up by the cap member 50 in either case when the second pipe is inserted in the ground and after it is inserted therein, and the leakage from between both joints 32 and 36 is prevented by the damming mentioned above.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention prevents groundwater from flowing out of the ground through a connecting portion of a pair of pipes which are inserted into the ground and are connected to each other to carry out a pipe roof construction method. For water stop structure.

[0002]

2. Description of the Related Art In order to carry out a pipe roof construction method, for example, a plurality of pipes are inserted into the ground from a starting shaft to a reaching shaft, whereby a plurality of parallel pipe rows are arranged in the ground. The ends of each row of pipes project into the starting shaft and the reaching shaft, respectively, for support by the supporting work later. The two rows of pipes adjacent to each other are provided with a female joint extending in the longitudinal direction and a male joint received by the female joint, and are connected to each other by both joints.

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 then a pipe in the second row is inserted into the ground, the groundwater becomes a male type of the pipe in the second row. The female joint of the first row of pipes, in which the joint is received, is introduced into the starting shaft as a conduit. This groundwater is not guided to the end of the pipe in the first row that projects into the starting shaft, and between the female-type joint and the male-type joint in the vicinity of the retaining wall that defines the pit wall of the starting shaft. It gushes from the surrounding area. Such a groundwater ejection phenomenon occurs also in the reaching shaft, and also when the pipe is inserted from the earth retaining wall into the ground without constructing the starting shaft or the reaching shaft.

In order to stop the ejection of groundwater, it is conceivable to fill the space defined by the female joint and the male joint near the wall surface 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 or practically impossible to fill the space with a space without gaps.

[0005]

DISCLOSURE OF THE INVENTION An object of the present invention is to insert a first pipe inserted into the ground leaving an end portion thereof for carrying out a pipe roof construction method and a ground pipe parallel to the first pipe. It is to prevent the outflow of groundwater from between the female joint and the male joint interconnecting the inserted second pipe.

[0006]

DISCLOSURE OF THE INVENTION The present invention relates to a first pipe which is passed through a retaining wall and is placed in the ground leaving an end portion in parallel to carry out a pipe roof construction method, and the first pipe and the first pipe. And a second pipe placed underground in the
Stop for preventing the outflow of groundwater from between the female joint and the male joint received by the female joint extending in the longitudinal direction on the side portion of the pipe and the side portion of the second pipe, respectively. The second structure, which has a water structure and is formed on the earth retaining wall
A concrete block having a hole for allowing the passage of the pipe, and an end portion of the first pipe and an end portion of the second pipe, which are arranged at a distance from each other and are fixed to the first pipe. A pair of cover plates that cover the female joint and the male joint and have one end face that is liquid-tightly fixed to the concrete block; A plurality of linear bodies extending toward one of the cover plates, a seal member attached to each cover plate and capable of being in close contact with the second pipe, and a plurality of linear members in close contact with the other end faces of the pair of cover plates and Two
A cap member made of an elastic material that can be in close contact with the pipe, and having a groove that allows liquid-tight insertion of the male joint of the second pipe, and is filled between the pair of cover plates. A non-permeable viscous substance is included.

[0007]

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 female joint and a male joint for connecting both pipes are provided. The circumference is covered with a pair of cover plates, and both ends of both cover plates are closed with a concrete block and a cap member. A non-water-permeable viscous substance filled between the cover plates is held between the cover plates by a large number of linear members, and a pair of seal members attached to the cover plates seals the second pipe and the both pipes. Leakage between the cover plate and the cover plate is prevented. The groove of the cap member is in liquid-tight contact with the male joint of the second pipe at the time of propulsion for inserting the second pipe into the ground, and the cap is of the second pipe. Liquid-tightly contact a part of the surface.

From this, the ground water that enters the female joint and moves in the female joint is dammed up by the cap member both at the time of inserting the second pipe into the ground and after it is inserted. Leakage between both joints due to the stop is stopped. This completely prevents the outflow of groundwater from the ground during the insertion work of the second pipe and after the insertion work.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION In order to carry out a pipe roof construction method, which is one of the methods for forming a space such as a tunnel or a basement in the ground, a plurality of rows parallel to each other from the start shaft to the arrival shaft Pipes are placed underground. Alternatively,
Further, a plurality of rows of parallel pipes penetrating the retaining wall are arranged in the ground without constructing the starting shaft or the reaching shaft. Each row of pipes arranged in the ground is composed of a plurality of pipes, and adjacent rows of pipes are connected to each other through a female joint provided in advance in the pipe and a male joint received therein.

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 after the shield type excavator propelled into the ground by the propulsion force of the propulsion device.

FIGS. 1 to 3 show the start shaft and the underground 10
First pipe row 12 consisting of multiple pipes propelled to
, A part of the second pipe row 14 adjacent to the first pipe row 12, and a part of the starting shaft 16.

The first pipe row 12 reaches the reaching shaft (not shown) from the starting shaft 16, while the second pipe row 14 does not reach the reaching shaft from the starting shaft 16 yet. It is in.

The starting shaft 16 is provided with a retaining wall 18 made of concrete, steel sheet pile or the like which substantially defines the shaft wall. The retaining wall 18 has two holes through which both rows of pipes penetrate (however, only holes 20 for the second row of pipes 14 are shown in the figure). On the retaining wall 18, a concrete block 28 provided with two starting pit openings 24, 26 is installed. The two starting holes 24 and 26 of the concrete block 28 are aligned with the two holes of the retaining wall 18, respectively, and the pipes of the two pipe rows 12 and 14 pass through these starting holes 24 and 26 and the holes of the retaining wall 18, respectively. It is promoted to 10th.

The rearmost pipe 30 in the first row of pipes 12 in the direction of propulsion has a concrete block 28 so that its end (rear end) 31 remains in the starting shaft 16.
It projects from the wellhead 24. Similarly, for the second pipe row 14, the end of the rearmost pipe (not shown) is left in the starting shaft 16. Further, the end portion (front end portion) of the frontmost pipe of each row of pipes is also set to be inside the reaching shaft. The ends of the pipes in each row extending in each shaft are used for support by a supporter installed in the shaft later. When installing the pipe in the ground without providing the starting shaft or the reaching shaft,
The ends of the pipes in each row project from a concrete block provided on a retaining wall to prevent the collapse of the ground.

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, the second pipe row 1
Each of the four pipes has a male joint 36 and a female joint 38 extending in the longitudinal direction on both sides of the pipe. Second
The male fitting 36 of the first pipe row is partially received by one female fitting 32 of the first pipe row 12 when each pipe of the second pipe row 14 is inserted into the starting hole of the concrete block 28. , All of which are received by the female joint 32 as the propulsion progresses, 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 placed next to the left of the first pipe row 12 later, the second
It is used for connection with a pipe row similar to the pipe row 14 of. The female fitting 38 of the second pipe row 14 is also used for connection with a pipe row similar to the second pipe row 14, which is subsequently arranged to the right of the second pipe row 14.

The illustrated female fittings 32, 34 and 38 are
Each of them is a pair of angle steels arranged at intervals in the circumferential direction of the pipe so that the inner corners thereof face each other, and the male joint 36 includes a pair of angle steels. Are arranged at intervals in the circumferential direction of the pipe so that the outer corner portions thereof face each other.

When the pipe roof construction method is applied to the ground with a relatively high groundwater level, the groundwater in the ground flows through each female joint as a water guide channel and flows into the starting 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 which are engaged with each other, and the female joint 34, which is not engaged with the male joint 34,
For No. 38, foam plastic material in each female fitting,
A padding 40 made of a water-insoluble viscous substance (oil clay, konjac, putty) or the like is arranged. The padding 40 also prevents the ingress of earth and sand into the female joint when propelling the pipe. The padding 40 is broken or compressed when the male joint is inserted into the female joint in which it is arranged. The water blocking structure of the present invention stops the groundwater flowing in the female joint after the padding 40 is destroyed and removed by the insertion of the male joint, or after being compressed and deformed.

The water-stop structure of the present invention comprises the first pipe array 12
Of the last pipe in the propulsion direction, that is, a pipe (hereinafter referred to as “first pipe”) 30 installed in the starting shaft 16 with an end portion left, and the second pipe row 14 that is sequentially propelled. The concrete block 28 is applied to each pipe (hereinafter referred to as “second pipe”) 42.
And the upper and lower parts of the first and second pipes 30 and 42 are arranged 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. A pair of cover plates 44 that extend, a plurality of linear bodies 46 that are respectively implanted in both cover plates 44 and extend toward the other cover plate 44, and each cover plate 4
4 and the seal member 48 attached to the cap member 5
0 and a water-impermeable viscous substance 52 filled between both cover plates 44.

The concrete block 28 includes a block portion 54 previously formed for propelling the first row of pipes 12.
And a block portion 56 which is formed afterwards for advancing the second pipe row 14 and is continuous with the block portion 54.
Reference numerals 58 and 60 shown in FIG.
6, which is used as a part of a mold for molding 6, and whose one end is fixed to the earth retaining wall 18, and the other open end of the rectangular cylinder is closed and the second pipe 42 is inserted. Hole 62 to allow
And a lid having.

The pair of cover plates 44 has one side portion 64.
In FIG. 3, it is liquid-tightly fixed to the side surface of the first pipe 30. Further, both cover plates 44 have one end surface 6
At 6, it is welded to the mold cover 60 and is thereby 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.

The large number of linear members 46 are made of plastic, metal or the like. The multiple linear bodies 46 extending from each cover plate 44 preferably have a length dimension that reaches the female joint 32 and the male joint 36, and in the example shown, one angle steel that constitutes each of these joints. Has a size.
These multiple linear bodies 46 hold the viscous substance 52 between the cover plates 44 so as not to flow between them.

Each sealing 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 longitudinally along the other side portion. extend. Each seal member 48 has a second pipe 42 on the other side.
Can be brought into close contact with the side surface of, i.e., can come into liquid-tight contact. Both seal members 48 contact the peripheral surface of the second pipe following the vibration or movement of the second pipe generated when propelled into the ground, and between the cover plates 44 and the second pipe 42. It prevents the viscous substance 52 from leaking from the inside and prevents the second pipe from coming into contact with both cover plates 44.

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 arranged so as to slightly project from the end surface 30 a of the first pipe 30. Therefore, the one end surface 72 of the cap member 50 in the illustrated example has an end surface portion 74 that is in close contact with the other end surfaces 70 of both cover plates and the first pipe 3.
The end surface portion 76 is in contact with a part of the end surface 30a of 0.
Instead of the illustrated example, the other end surfaces 70 of both cover plates 44 are first
Can be set so as to be flush with the end face 30a of the pipe 30 or the other end face 70 not to project from the end face 30a. In accordance therewith, the one end face 72 of the cap member 50 is at least both cover plates. The shape can be changed so as to be in liquid-tight contact with the other end surface 70 of the.

The cap member 50 also has a cylindrical surface 75 which can be brought into close contact with the side surface of the second pipe 42, and extends in the longitudinal direction of the cap member 50 and opens at both end surfaces 72 and 73 thereof and is released to the cylindrical surface 75. , Two grooves allowing the liquid-tight insertion of the male joint 36 of the second pipe 42, in the example shown, a chevron crossing approximately equal to the cross-sectional shape of the two chevron steels that make up the male joint 36. And two grooves 77 having a surface shape. The cylindrical surface 75 and the groove 77 are in liquid-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 substance from between the contact portions is in contact. 52 and water leakage.

The cap member 50 includes a pair of cover plates 44 and a first cover plate 44, which is in contact with the end surface 73 of the cap member 50, and a plurality of bolt-nut assemblies 80 for fastening the pressing plate 78 to the ribs 67. Is pressed against the pipe end of the pipe 30 of FIG. The pressing plate 78 is a notch 78a that allows the male joint 36 to move when propelling the second pipe 42.
Having.

Both cover plates 44 and both seal members 48
And the concrete block 28 and the cap member 50
The viscous substance 52 arranged in the space defined by and surrounding the joints 32 and 36 is made of grease in the illustrated example. The viscous substance 52 adheres to the peripheral surface of the propelled second pipe 42, and the amount thereof gradually decreases. In order to supplement this amount, an injection port 81 for replenishing the viscous substance 52 is provided in the upper cover plate 44.

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 cap member 50 blocks the movement of groundwater entering the female joint 32 toward the starting shaft 16 in the ground, and the viscous substance surrounding the female joint 32 and the female joint 36 received therein. By 52, the lateral overflow of the groundwater from the female joint 32 due to the damming of the groundwater is stopped. As a result, the spouting of the groundwater into the starting shaft 16 is prevented.

In the illustrated example, a sponge is provided so that water leakage between the second pipe 42 and the well 26 of the concrete block 28 can be prevented and the second pipe 42 can smoothly move through the well 26. A sheet 82 made of metal is embedded in the concrete block 28. The seat 82 partially covers the periphery of the second pipe 42 and the periphery of both cover plates 44.

FIGS. 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. The female joints 32 shown in FIGS. 4, 5 and 6 each have a C-shaped cross section. The male joint 36 shown in FIGS. 4, 5 and 6 is T-shaped, circular and I-shaped connected thereto, and
It has a C-shaped cross section. The female joint 32 shown in FIGS. 7 and 8 has a cross-sectional shape similar to that shown in FIG.
Further, the male joint 36 has a cross-sectional shape similar to that shown in FIGS. 4 and 5. 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 a shape substantially the same as the outer shape of the male joint. The male joint 3 shown in FIGS. 6 and 8
The circular portion 6 has both end surfaces closed by plate materials in order to prevent the intrusion of earth and sand.

The water stop structure according to the present invention can be applied to the reaching shaft, and just as in the starting shaft, it can block the inflow of groundwater from the connecting portion of both pipes to the reaching shaft. Further, the present invention may be applied to prevent the outflow of groundwater from the connecting portion of both pipes installed in the ground through the earth retaining wall without providing the starting shaft or the reaching shaft. it can.

[Brief description of drawings]

FIG. 1 is a front view of a first pipe of a water blocking structure according to the present invention as seen from a pipe end.

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 the female joint and the male joint.

FIG. 5 is a cross-sectional view of another example of the female joint and the male joint.

FIG. 6 is a cross-sectional view of another example of the female joint and the male joint.

FIG. 7 is a cross-sectional view of another example of the female joint and the male joint.

FIG. 8 is a cross-sectional view of another example of the female joint and the male joint.

FIG. 9 is a cross-sectional view of another example of the female joint and the male joint.

[Explanation of symbols]

 16 Starting shaft 18 Soil retaining wall (pit 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)

[Claims] 1. A first pipe which is passed through an earth retaining wall and is placed in the ground leaving an end portion for carrying out a pipe roof construction method, and a first pipe which is placed in the ground in parallel with the first pipe. A second pipe and a side portion of the first pipe and the second pipe.
Is a water stop structure for preventing outflow of groundwater from between a female joint extending in the longitudinal direction of the pipe and a male joint received by the female joint, and the earth retaining wall And a concrete block having a hole that allows the second pipe to be inserted therethrough, and a space between the end of the first pipe and the end of the second pipe. A pair of cover plates fixed to the first pipe and covering the female joint and the male joint, the pair of cover plates having one end face liquid-tightly fixed to the concrete block; A large number of linear bodies that are implanted in the cover plates and extend toward each other cover plate, a seal member that is attached to each cover plate and is in close contact with the second pipe, and a pair of cover plates. Close to the other end and A cap member made of an elastic material that can be in close contact with the second pipe, the cap member having a groove that allows liquid-tight insertion of the male joint of the second pipe, and the pair of cover plates. A waterproof structure including a filled non-permeable viscous substance.