JPH1037673A - Cutoff structure and cutoff method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the leakage of groundwater from the mutual connecting sections of pipes pressed into a bedrock by using the solidified substance of a liquefied resin having cutoff properties and elasticity in a method of pipe roofing construction employed for constructing a subsurface structure. SOLUTION: The male joint 28 of a pipe 16 pressed into a bedrock from the departure port of portal concrete 22, to which an annular entrance packing 38 consisting of a plate made of a rubber is installed for preventing the leakage of groundwater, is connected mutually with the female joint 26 of a pipe 14 slidably. A notch 39 is formed partially to the entrance packing 38, the upper and lower spaces 52 of the male-female joints 26, 28 and a space in the female joint 26 are filled with a cold-setting liquefied resin such as a polyurethane resin through forms 58, 60 and a padding such as clay as the cutoff structure 10 of the notch 39. Accordingly, the leakage of groundwater from the notch section of the entrance packing 38 and the inside of the female joint 26 can be prevented effectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof structure and a waterproof structure applied to a pipe which is press-fitted into the ground to construct an underground structure such as an underground wall or a tunnel for waterproofing and reinforcement. Water method.

[0002]

2. Description of the Related Art A pipe roof method is used to construct an underground structure. In this method, a plurality of pipes are pressed into the ground in parallel with each other and connected to each other via a retaining wall and a wellhead concrete supported by the retaining wall. Both pipes adjacent to each other, as these connecting means,
A female joint with a longitudinally extending slit and a male joint with a longitudinally extending slit are provided. The pipes are connected to each other by passing the slits of the female joint of the first pipe, which has been press-fitted into the ground first, through the male joint of the second pipe, which is press-fitted in parallel with the first pipe. This is performed by engaging with.

By the way, in the ground where the groundwater level is high, if a plurality of the first pipes in the first row are inserted into the ground and then the pipes in the second row are inserted into the ground, the male pipes of the second row are formed. The female fitting of the first row of pipes in which the fitting has been received is guided into the starting shaft as a headrace. This groundwater protrudes from the ground into the shaft.
Without being guided to the tip of the pipe in the row, it is ejected into the shaft from between the male and female joints engaged with each other near the wellhead concrete. Such groundwater spouting phenomenon also occurs in reaching shafts, and also occurs when pipes are injected into the ground from wellhead concrete without building a shaft.

In order to stop the discharge of the groundwater, the space defined by the female joint and the male joint is filled near the wall surface of the wellhead concrete. However, since the cross-sectional shape of the space defined by the male and female joints is complicated, it is not easy to fill the space without any gaps with padding, and a sufficient water stopping effect cannot be obtained.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to prevent the leakage of groundwater from between male and female joints interconnecting a first pipe and a second pipe which are press-fitted in parallel to a ground. To provide a water stopping structure and a water stopping method.

[0006]

SUMMARY OF THE INVENTION According to the present invention, there is provided a water stopping structure and a water stopping method comprising: a first pipe having a female joint having a slit extending in a longitudinal direction, which is press-fitted into a ground;
A second pipe press-fitted into said ground in parallel with said pipe, said second pipe having a male joint passing through a slit of said female joint and engaging with said female joint; Applied during. Both pipes are propelled underground through wellhead concrete.

The watertight structure fills the space around a part of the male and female joints engaging with each other and the internal space of the part of the female joint outside the ground, and And a solidified liquid resin having water repellency and elasticity in contact with the liquid resin. Alternatively, the space around a part of the male and female joints, the space inside the part of the female joint, and the space around a part of the second pipe are filled and come into contact with the wellhead concrete. Includes solidified liquid resin having water-stopping and elastic properties. When the entrance packing is attached to the wellhead concrete, the solidified liquid resin contacts the entrance packing through which the second pipe penetrates.

[0008] The liquid resin is made of a liquid resin curable at room temperature such as a polyurethane resin, and the solidified product has water stopping property and elasticity. This liquid resin, in conjunction with the wellhead concrete, after installing a formwork that defines a space around a part of the male and female joints, the inside of the formwork and the inside of the part of the female joint Or, in cooperation with the wellhead concrete, after installing a formwork that defines a space around a part of both the male and female joints and a part of the second pipe, And a part of the female joint.

[0009]

According to the present invention, the space between the female joint and the male joint engaged with each other and the space around both joints fill the space between them and stop the liquid resin in close contact with the wellhead concrete. Since the solidified water is filled without gaps, groundwater flowing between the joints and along the joints can be reliably stopped at the wall surface of the wellhead concrete. Also, by covering the periphery of the second pipe with the solidified material, the groundwater flowing around the second pipe caused by stopping the flow of the groundwater at the connection point of the two joints can be formed. The accompanying outflow of groundwater along the peripheral surface of the second pipe can be stopped.
Further, since the solidified material has elasticity,
After propelling the second tube into the ground, it is in close contact with and allows passage of a portion of the peripheral surface of another second tube and its male fitting which is subsequently propelled further. Thereby, a plurality of second
During the propulsion of the second tube, the water stoppage for each second tube is maintained.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, a waterproof structure according to the present invention is indicated generally by the reference numeral 10. Water stop structure 1
In order to carry out a pipe roof construction method for constructing an underground structure such as an underground wall or a tunnel for water stoppage, reinforcement, etc., a series press-fitted into the ground 12 (FIG. 2) is used. A plurality of steel pipes (first pipes) 14 and steel pipes (second pipes) which are pressed into the ground 12 in parallel with the pipes and are connected to the first pipes 14.
To prevent the outflow of groundwater from between the pipe 16).

Each of the first pipe 14 and the second pipe 16 has a hole 20 (FIG. 2) provided in a retaining wall 18 made of a sheet pile or a concrete wall, and a block-like structure supported by the retaining wall 18. And a starting port 24 (FIG. 2) provided in the wellhead concrete 22. Symbol 25 is
The formwork supported on the retaining wall 18 for forming the wellhead concrete 22 is shown.

The first tube 14 has a female joint 26 and the second tube 16 has a male joint 28. Female joint 2
6 has a slit 30 formed on the side of the first tube 14 and extending in the longitudinal direction thereof. In addition, the male joint 28
The tube 16 comprises a protrusion provided on the side of the tube 16 and extending in the longitudinal direction thereof, the protrusion having a T-shaped cross section.

The first and second pipes 14 and 16 are provided with a flange 32 of a T-shaped male joint 28 and a web 34 connected thereto.
Are received inside the first tube 14 and connected to each other with the web 34 passed through the slit 30. A portion of the male fitting 28 is used to propel the second tube 16
The first tube 14 is inserted into the inside from the tube end.

Inside the first tube 14 is mounted a channel-shaped rail 36 extending in the longitudinal direction thereof.
Both ends of the rail 36 are fixed to the inner surface of the first tube 14 in a cross section. Rail 36 guides flange 32 of male fitting 28 of second tube 16 in the axial direction of tube 16.

The female joint provided in the first tube 14 may be one which is attached to the outside (outer surface) of the first tube 14 to define a slit in addition to the example shown in FIG. 6 and 10). Further, the male joint is
As long as it has a portion extending through the slit and a portion held inside the first tube, it may have a cross-sectional shape other than the T-shape. The female joint 26 shown in FIGS. 5, 6 and 10 is made of a pair of angle irons attached to the outer surface of the side of the first pipe 14 and extending in the longitudinal direction thereof. The angle irons are spaced from each other such that their inner surfaces 26a face each other and define a slit 30. The male joint 28 is made of a pair of angle irons. The angle irons are spaced from each other such that their outer surfaces 28a face each other, a portion of which extends into the female joint 26 through the slit 30.

The first pipe 14 shown in FIG.
Another female joint 26 is provided on the other side opposite to the side on which the second pipe 6 is provided, which female joint 26 is connected to the male part of another second tube which is later propelled into the ground. The shape fitting is engaged. In addition, a female joint 26 similar to the female joint of the first pipe 14 is provided on the other side of the second pipe 16 of FIG. 1 opposite to the side on which the male joint 28 is provided. Have been.
This female joint 26 of the second tube 16 is engaged with a male joint of another second tube (not shown) which is later propelled parallel to the ground. Thus, the illustrated second tube 16 having the female joint 26 is a first tube with respect to the other tubes having a male joint engaged with the female joint. FIG.
As shown in FIG. 10, the first tube 14 may be provided with male and female joints 26 and 28 on both sides thereof.

The first and second pipes 14 and 16 are respectively formed from inside a shaft (not shown) by using a propulsion device (not shown) including a hydraulic jack, and a shield excavator. Following this, it will be propelled underground.

When the shield machine and the subsequently propelled second pipe 16 pass through the starting port 24 of the wellhead concrete 22, the wellhead is used to prevent leakage of groundwater from the starting port 24 into the shaft. An entrance packing 38 made of a rubber plate is attached to the concrete 22.

As shown in FIG. 1, the entrance packing 38 has a ring shape as a whole and is partially cut away.
The entrance packing 38 is arranged concentrically with the start port 24, and both ends defining the notch 39 are in contact with the outer peripheral surface of the first pipe 14. In addition, entrance packing 3
8 cut-out 39 allows insertion of the male fitting 28 of the second tube.

The entrance packing 38 is provided with a hole 4 for allowing the shield machine or the second pipe 16 to pass therethrough.
0, and is bent forward of the shield machine by the passage of the shield machine in the propulsion direction of the shield machine.
Has an edge 42 around it. The peripheral portion 42 is in contact with the cylindrical surface that is the outer peripheral surface of the shield machine or the second pipe 16, and prevents the movement of the groundwater and the earth and sand between the peripheral portion 42 and the cylindrical surface.

The entrance packing 38 has holes 4
It is fixed to the wellhead concrete 22 via a plurality of steel plates 44 spaced apart from each other around 0 and a steel plate 45 in the form of an arc. Each plate 44
Is provided with one or two elongated holes 46. On the other hand,
A plurality of anchor bolts 48 are implanted in the wellhead concrete 22. Each plate 44 is passed through each anchor bolt 48 through each elongated hole 46, and each plate 44 is fastened with a nut screwed to each anchor bolt 48. Prior to the plate 44, the backing plate 45 is passed through an anchor bolt 48 through a plurality of holes provided in the plate. Also, a plurality of plates 44 surrounding the circumference of the second tube 16 are located behind the forwardly bent entrance packing perimeter 42 so that the perimeter is not bent to the opposite side by groundwater pressure.

In the entrance packing 38,
One or more score lines 50 are provided so that a portion of the peripheral edge 42 of the entrance packing 38 can be easily bent by the joint when passing through the female joint or the male joint.

Referring to FIG. 1 and FIG. 2, FIG. 5 and FIG.
The liquid resin solidified material 56 fills the upper and lower spaces 52, which are spaces around a part of the joints 6 and 28 in the axial direction, and the space 54 of the female joint 26. The solidified material 56 has water stopping property and elasticity. The female joint space 54 of FIGS. 1 and 2 is defined by a portion of the first tube 14 and the rail 36, and the female joint space of FIGS.
Is defined by a part of the pipe 14 and the angle irons.

The space 52 above and below both joints and a part of the space 54 of the female joint are outside the ground 12. More specifically,
The inside of the shaft is moved from the wellhead concrete 22 to the pipes 14 and 16.
Extending in the longitudinal direction.

The solidified material 56 of the liquid resin fills the space between the female joint 26 and the male joint 28 engaged with each other without any gap,
Further, the space between the two pipes 14 and 16 is filled without any gap. Therefore, the solidified material 56 prevents the movement of the groundwater between the joints 26 and 28 and along the joints. Further, since the solidified material 56 is in contact with the wellhead concrete 22, leakage of groundwater from between the solidified material 56 and the wellhead concrete 22 is prevented.

Further, since the solidified material 56 has elasticity, the solidified material 56 allows some run-out during further propulsion of the second pipe 16 and maintains the water stopping property. Also, after the propulsion of the second pipe 16, when the other second pipe similar to this is subsequently propelled, the same water stoppage is provided in contact with the pipe and a part of the male joint thereof.

The upper and lower spaces 52 of the joints 26 and 28 shown in FIGS. 1 and 2 can be defined by using, for example, two molds 58 and 60 shown in FIGS. Both forms 58,60 are placed after the first propelled second pipe 14 has been passed through the launch port 24 of the wellhead concrete 22.

One formwork 58 is formed of a single steel plate member, and has curved side portions 62 and 64 having the same curvature as the peripheral surfaces of the first and second pipes 14 and 16, and a small width lower end. Part 66
And an upper end 68 having a large width. This formwork 58 is located above the male fitting 28 of the second tube 14 and
The other formwork 60 is located below the male joint 28.

The other formwork 60 is made of a steel plate member having an L-shape as a whole, and has a one-piece portion 70 symmetrical to one formwork 58 with respect to the web 34 of the male joint 28, and an orthogonal portion thereto. And another piece portion 72. Since the one-piece part 70 is substantially the same shape as the mold 58, the same reference numerals as those assigned to the mold 58 are given to both sides and both upper and lower ends of the one-piece part 70. The other piece 72 of the mold 60 has a rectangular planar shape as a whole, and has the same width as the lower end 68 of the one piece 70.

The two forms 58, 60 are arranged behind the wellhead concrete 22 (rearward in the direction of propulsion) before the first second pipe 16 is propelled. At this time, the lower end 66 of one mold 58 and the upper end 66 of the other mold 60
Each slightly away from the male fitting web 34 of the second tube 16 so that one side 62 of each form 58, 60 is welded to the side of the first tube 14 that has already completed its propulsion. I do. At this time, a slight gap is formed between the other side 64 of each of the molds 58 and 60 and the second pipe 16. Thereby, the possibility of movement of the second pipe 16 with respect to both the molds is ensured. The tip of the other piece 72 of the other formwork 60 is brought into contact with the wellhead concrete 22 or the entrance packing 38. Thereby, the space 52 is defined.

The liquid resin, ie, polyurethane, is placed in a space 52 defined by these molds 58, 60, that is, the molds 58, 60, the peripheral surfaces of the pipes 14, 16 and the wellhead concrete or the entrance packing 38. A cold-setting liquid resin such as a resin is poured. While filling the space 52, the liquid resin flows into and fills the female joint 26 of the first tube through the slit 30 of the first tube through which the web 34 of the male joint 28 of the second tube penetrates. . The liquid resin solidifies over time. In order to prevent the liquid resin from flowing through the female joint 26 in the longitudinal direction, the inside of the female joint 26 is filled with a padding such as clay at the front position of the entrance packing 38 and the rear position of the molds 58 and 60. It is desirable to block with 74.

In the embodiment shown in FIGS. 5 and 6, the molds 58, 58 used in the embodiment shown in FIGS.
Form frames 76 and 78 similar to 60 are used. However, one mold 76 and one piece of the other mold 78 having one piece and another piece orthogonal to each other are different from each other in the molds 58 and 60 depending on the shape of the male and female joints. With different shapes. That is, one part of the formwork 76 and the formwork 78 are respectively formed by cranking along a part of an outer surface of the angle iron of one of the female joints 26 and a part of an inner surface of the angle iron of one of the male joints 28. It has a lower end and an upper end of the shape.

Referring to FIGS. 7 to 10, in the illustrated example, in the shaft, around the part of the male and female joints 26 and 28 engaged with each other, as well as a part of the second pipe 16. Is used.

The formwork 80 includes a steel bending member 82 having a cylindrical portion, an outer edge fixed to one open end of the bending member 82 and having the same cross-sectional shape as the bending member 82 and the second pipe 16. And a generally annular steel plate member 84 having an inner diameter slightly larger than the outer shape of.

The bending member 82 has a diameter greater than the outer diameter of the second tube 16, preferably the entrance packing 38.
Having a diameter greater than the outer diameter of The curved member 82 surrounds the periphery of the second pipe 16, and the other open end is welded to the formwork 25 of the steel-concrete 22. Both ends in the circumferential direction of the bending member 82 are welded to the circumferential surface of the first pipe 14 at positions above and below the slit 30. In addition, the curved member 82 has an opening 88 provided at the top thereof for charging the liquid resin.

On the other hand, the plate member 84 has a hole 90 which is approximately equal to the cross-sectional shape of a part or front part of the male joint 28, which allows the second tube 16 to penetrate the male joint 28. That is,
In the embodiments shown in FIGS. 7 to 9, there are straight holes 90 through which the web 34 of the male joint 28 passes, and in the embodiment shown in FIG. 10, there are a pair of angle-shaped holes 90 through which a pair of angle irons pass.

The rail 3 extends from the pipe end of the first pipe 14 projecting from the wellhead concrete 22 toward the longitudinal direction thereof.
6 (FIGS. 7 to 9) or a part of the female joint 26 (FIG. 10) has been cut away. The plate member 84 contacts and is welded to the cut end of the rail 36 or the cut end of the female joint 26. Therefore, in this embodiment, the plate member 84 can block the liquid resin flowing into the female joint 26. It should be noted that the liquid resin is composed of the plate member 84 and the second tube 1.
6 to prevent leakage from between
It is desirable to arrange a ring-shaped seal member 92 surrounding the plate 6 and in contact with the plate member 84. If necessary, a part of the female joint 26 can be cut off in the embodiment shown in FIG.

When the liquid resin is poured into the mold 80 from the opening 88 of the mold 80, the second tube 1 defined by the mold 80 is formed.
The space around 6, the spaces above and below the joints 26 and 28 and the internal space of the female joint 26 are filled with the liquid resin, and the liquid resin solidifies with time. The liquid resin contacts and covers the entrance packing 38 and the plate 44 supporting the same, as described above. Also in this embodiment, it is desirable that padding such as clay or rag is previously applied to the front area so that the liquid resin in the female joint 26 does not flow to the front area of the entrance packing 38.

The solidified liquid resin 94 is supplied to the second pipe 16.
Of the groundwater flowing around the peripheral surface of the second pipe 16 caused by blocking the groundwater flowing through the male and female joints 26 and 28 engaged with each other, and the second pipe associated therewith. It is possible to prevent groundwater flowing along the peripheral surface of the shaft 16 from flowing into the shaft.

The water stopping structure and the water stopping method described above can be applied between the arrival port and the second pipe 16 in the arrival shaft for receiving the pipe propelled underground, and use the shaft. It can be applied between a second pipe and its launch or destination when propelled underground without incident.

[Brief description of the drawings]

FIG. 1 is a schematic front view of a water stopping structure according to the present invention.

FIG. 2 is a cross-sectional view taken along line 2-2 of FIG.

FIG. 3 is a front view of a mold.

FIG. 4 is a side view of the mold shown in FIG. 3;

FIG. 5 is a schematic front view of a water stop structure of another embodiment.

FIG. 6 is a cross-sectional view taken along line 6-6 of FIG.

FIG. 7 is a schematic front view of a water stop structure of another embodiment.

FIG. 8 is a cross-sectional view taken along line 8-8 of FIG. 7;

FIG. 9 is a plan view of the structure shown in FIG. 7;

FIG. 10 is a schematic front view of a water stop structure of another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Waterproof structure 14 Earth retaining wall 16, 18 First and second pipes 20, 22 Female joint and male joint 26 Sheet 28 Fastener 30 Formwork 32 Solidified concrete or mortar

Claims (6)

[Claims] 1. A first pipe having a female joint having a slit extending in a longitudinal direction, which is press-fitted into a ground through a wellhead concrete, and a first pipe is formed in the ground in parallel with the first pipe. Water stop applied between the press-fit second pipe and a second pipe having a male fitting engaged with the female fitting through a slit in the female fitting of the first pipe. Structure,
Outside the ground, the space surrounding the part of the male and female joints engaging with each other and the internal space of the part of the female joint are filled and have waterproofness and elasticity in contact with the wellhead concrete. Water-blocking structure containing solidified liquid resin. 2. A first pipe having a female joint having a slit extending in a longitudinal direction, which is press-fitted into a ground through a wellhead concrete, and a first pipe is provided on the ground in parallel with the first pipe. A second press-fit second tube having a male fitting passed through the female fitting slit and engaging the female fitting;
A water-blocking structure applied between the pipe and the outside of the ground, a space around a part of the male and female joints engaging with each other, and an interior of the part of the female joint. A water-blocking structure that fills a space and a space around a part of the second pipe and includes a solidified liquid resin having a water-blocking property and elasticity in contact with the wellhead concrete. 3. The entrance pipe according to claim 2, wherein the second pipe is pressed into the ground through an entrance packing attached to the wellhead concrete, and the solidified liquid resin is in contact with the entrance packing. Waterproof structure. 4. The waterproof structure according to claim 1, wherein the liquid resin is made of a polyurethane resin. 5. A first pipe having a female joint having a slit extending in a longitudinal direction, which is press-fitted into a ground through a wellhead concrete, and said first pipe is connected to said ground in parallel with said first pipe. A second press-fit second tube having a male fitting passed through the female fitting slit and engaging the female fitting;
A method of applying a water stop between the pipe and the outside of the ground, wherein a formwork that defines a space in cooperation with the wellhead concrete around a part of both the male and female joints engaged with each other. A water stopping method, comprising: pouring a cold-setting liquid resin having a water-stopping property and elasticity into the mold and into the inside of the part of the female joint after installation. 6. A first pipe provided with a female joint having a slit extending in a longitudinal direction, which is press-fitted into a ground through a wellhead concrete, and said first pipe is parallel to said ground. A second press-fit second tube having a male fitting passed through the female fitting slit and engaging the female fitting;
A method of applying a water stop between the pipe and the outside of the ground, around the part of the male and female joints engaged with each other and around the part of the second pipe. After installing the formwork that defines the space in cooperation with the wellhead concrete, the room temperature hardening liquid resin in the formwork and inside the part of the female joint, and the solidified product is waterproof. And a water stopping method in which an elastic liquid resin is poured.