JP3734890B2 - Water stop structure and water stop method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a water stop structure and a water stop method applied to a pipe press-fitted into a natural ground in order to construct underground structures such as underground walls and tunnels for water stop and reinforcement.
[0002]
[Prior art]
The pipe roof method is used to construct underground structures. In this construction method, a plurality of pipes are press-fitted into a natural ground in parallel with each other through a retaining wall and a wellhead concrete supported by the retaining wall and connected to each other. Both pipes adjacent to each other are provided with a female joint having a slit extending in the longitudinal direction and a male joint extending in the longitudinal direction as the connecting means. The pipes are connected to each other by passing the male joint of the second pipe press-fitted parallel to the first pipe through the slit of the female joint of the first pipe press-fitted into the ground first. Is performed by engaging.
[0003]
By the way, in the ground where the groundwater level is high, when a plurality of first pipes in the first row are inserted into the ground, a second row of pipes is inserted into the ground, and the male joint of the second row of pipes is received. The female joint of the first row of pipes is led into the start shaft as a water conduit. The groundwater is jetted into the shaft from between the joints of the male and female engaged with each other in the vicinity of the wellhead concrete without being led from the natural ground to the tip of the first row of pipes protruding into the shaft. Such groundwater eruption phenomenon occurs in the reaching shaft, and also occurs when a pipe is pressed into the ground from the concrete at the entrance without constructing the shaft.
[0004]
In order to stop the ejection of the groundwater, padding is performed in the space defined by the female joint and the male joint in the vicinity of the wall surface of the wellhead concrete. However, since the cross-sectional shape of the space defined by both the male and female joints is complicated, it is not easy to fill the space without any gaps with fillings, and a sufficient water stop effect cannot be obtained.
[0005]
[Problems to be solved by the invention]
An object of the present invention is to provide a water-stopping structure and a water-stopping method for stopping leakage of groundwater from both male and female joints that interconnect both first and second pipes that are press-fitted parallel to a natural ground. It is to provide.
[0006]
[Means for Solving the Problems]
A water stop structure and a water stop method according to the present invention include a first pipe having a female joint having a slit extending in a longitudinal direction and press-fitted into a natural ground, and parallel to the first pipe. The second pipe is press-fitted into the natural ground and is applied between the second pipe having a male joint that is passed through the slit of the female joint and engages with the female joint. Both pipes are propelled underground through wellhead concrete.
[0007]
The water stop structure is a structure that fills the space around a part of both the male and female joints engaged with each other and the part of the internal space of the female joint outside the ground and is in contact with the wellhead concrete. Includes solidified liquid resin having water and elasticity. Alternatively, a space around a part of both the male and female joints, a part of the internal space of the female joint, and a space around a part of the second pipe are filled and in contact with the wellhead concrete. Includes solidified liquid resin having water-stopping and elasticity. When the entrance packing is attached to the wellhead concrete, the solidified product of the liquid resin is in contact with the entrance packing through which the second pipe passes.
[0008]
The liquid resin is made of a room temperature curable liquid resin such as a polyurethane resin, and the solidified product has water-stopping property and elasticity. This liquid resin is used in combination with the wellhead concrete, after installing a mold that defines a space around a part of both male and female joints, and in the mold and inside the part of the female joint. Or after forming a mold defining a space around a part of both the male and female joints and a part of the second pipe in cooperation with the wellhead concrete, And into a part of the female joint.
[0009]
Operation and effect of the invention
According to the present invention, the space between the female joint and the male joint that are engaged with each other and the space around the joints are filled with a water-resisting solidified product of liquid resin that fills these and is in close contact with the wellhead concrete without gaps. Since it is buried, the groundwater which flows between both joints and along each joint can be reliably stopped on the wall surface of the wellhead concrete. Further, by covering the periphery of the second pipe also with the solidified material, the groundwater wraps around the second pipe caused by stopping the flow of the groundwater at the connection point of the two joints, and Accordingly, the outflow of groundwater along the peripheral surface of the second pipe can be stopped. Further, since the solidified product has elasticity, a part of the peripheral surface of the other second tube to be further propelled after the second tube is propelled into the ground and the male shape thereof. Close to the joint and allow its passage. Thereby, the water stop for each second pipe is maintained during the propulsion of the plurality of second pipes.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Referring to FIG. 1, a water stop structure according to the present invention is indicated generally by the numeral 10. The water stop structure 10 is first press-fitted into the natural ground 12 (FIG. 2) in order to implement a pipe roof construction method for constructing underground structures such as underground walls and tunnels for water stop and reinforcement. A plurality of steel pipes (first pipes) 14 in series, and a steel pipe (second pipe) 16 that is press-fitted into the ground 12 parallel to the pipes and connected to the first pipe 14. It is provided to prevent the outflow of groundwater from between.
[0011]
The first pipe 14 and the second pipe 16 are respectively a hole 20 (FIG. 2) provided in a retaining wall 18 made of a sheet pile or a concrete wall, and a block-shaped wellhead concrete supported by the retaining wall 18. It extends into the ground via a start port 24 (FIG. 2) provided at 22. Reference numeral 25 denotes a formwork supported by the retaining wall 18 for forming the wellhead concrete 22.
[0012]
The first tube 14 has a female joint 26 and the second tube 16 has a male joint 28. The female joint 26 has a slit 30 formed on the side of the first tube 14 and extending in the longitudinal direction thereof. The male joint 28 includes a protrusion provided on the side of the second pipe 16 and extending in the longitudinal direction thereof, and the protrusion has a T-shaped cross-sectional shape.
[0013]
The first and second pipes 14 and 16 are configured such that the flange 32 of the T-shaped male joint 28 and a part of the web 34 connected thereto are received in the first pipe 14 and the web 34 is formed in the slit 30. They are connected to each other in the threaded state. A part of the male joint 28 is inserted into the inside of the tube end of the first tube 14 when the second tube 16 is propelled.
[0014]
A channel-shaped rail 36 extending in the longitudinal direction is attached to the inside of the first tube 14, and both end portions of the rail 36 are fixed to the inner surface of the first tube 14 as viewed in the cross section. The rail 36 guides the flange 32 of the male joint 28 of the second pipe 16 in the axial direction of the pipe 16.
[0015]
In addition to the illustrated example, the female joint provided in the first tube 14 may be attached to the outside (outer surface) of the first tube 14 to define a slit (see FIGS. 5, 6, and 6). (See FIG. 10). Further, the male joint may have a cross-sectional shape other than the T shape as long as it has a portion extending through the slit and a portion held in the first tube. The female joint 26 shown in FIGS. 5, 6 and 10 is made of a pair of angle steels attached to the outer surface of the side portion of the first tube 14 and extending in the longitudinal direction thereof. The two angle steels are spaced from each other so that their inner surfaces 26a are opposed to each other, thereby defining a slit 30. The male joint 28 is made of a pair of angle steels. The two angle steels are spaced from each other so that their outer surfaces 28a are opposed to each other, and a part of them extends into the female joint 26 through the slit 30.
[0016]
The first pipe 14 shown in FIG. 1 is provided with another female joint 26 on the other side opposite to the side on which the female joint 26 is provided. A male joint of another second tube that is later propelled into the ground is engaged. Further, the second pipe 16 in FIG. 1 is provided with a female joint 26 similar to the female joint in the first pipe 14 on the other side portion opposite to the side portion on which the male joint 28 is provided. It has been. The female joint 26 of the second pipe 16 is engaged with a male joint of another second pipe (not shown) which is later pushed into the ground in parallel therewith. Thus, the illustrated second tube 16 having the female joint 26 is the first tube relative to other tubes having a male joint engaged with the female joint. As shown in FIGS. 5 to 10, the first tube 14 may include both male and female joints 26 and 28 on both sides thereof.
[0017]
The first and second pipes 14 and 16 are respectively connected from the shaft (not shown) using, for example, a propulsion device (not shown) including a hydraulic jack, and with a shield machine at the head. Subsequently, it will be propelled underground.
[0018]
In order to prevent leakage of groundwater from the start port 24 into the shaft when the shield machine and the second pipe 16 that is subsequently propelled pass through the start port 24 of the well port concrete 22, An entrance packing 38 made of a rubber plate is attached.
[0019]
As shown in FIG. 1, the entrance packing 38 has an annular shape as a whole and is partially cut away. The entrance packing 38 is disposed concentrically with the start opening 24, and both end portions defining the notch 39 are in contact with the outer peripheral surface of the first tube 14. The notch 39 in the entrance packing 38 allows the male joint 28 of the second pipe to be inserted.
[0020]
The entrance packing 38 has a hole 40 that allows the shield machine or the second pipe 16 to pass therethrough, and the hole 40 is bent forward in the propulsion direction of the shield machine by passing the shield machine. And has an edge 42 around. 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 earth and sand between the peripheral portion 42 and the cylindrical surface.
[0021]
The entrance packing 38 is fixed to the wellhead concrete 22 via a plurality of steel plates 44 and arcuate steel contact plates 45 arranged around the hole 40 at intervals. 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 into each anchor bolt 48. Prior to the plate 44, the contact plate 45 is passed through the anchor bolt 48 through a plurality of holes provided in the plate 44. Further, the plurality of plates 44 surrounding the second pipe 16 are located behind the peripheral portion 42 of the entrance packing that is bent forward, so that the peripheral portion is not bent to the opposite side by underground water pressure.
[0022]
Further, the entrance packing 38 is provided with one or a plurality of cut lines 50 so that a part of the peripheral portion 42 of the entrance packing 38 is easily bent by the joint when passing through the female joint or the male joint. It has been.
[0023]
Referring to FIGS. 1, 2, 5, and 6, the water stop structure 10 includes an upper and lower space 52 that is a part of the surrounding space in the axial direction of the male and female joints 26 and 28 that engage with each other, and a female It consists of a solidified material 56 of a liquid resin that fills the partial space 54 of the shape joint 26. The solidified product 56 has water-stopping properties 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. 5 and 6 is part of the first tube 14. And the both angle irons.
[0024]
The upper and lower spaces 52 of both joints and the partial space 54 of the female joint are outside the natural ground 12. In more detail, the inside of the shaft extends from the well concrete 22 toward the longitudinal direction of the pipes 14 and 16.
[0025]
The liquid resin solidified material 56 fills the gap between the female joint 26 and the male joint 28 that are engaged with each other without gaps, and fills the gap between the pipes 14 and 16 with no gaps. For this reason, the solidified material 56 prevents the movement of ground water between the joints 26 and 28 and through the joints. Moreover, 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.
[0026]
In addition, since the solidified product 56 has elasticity, the second tube 16 is allowed to be slightly shaken during further propulsion and retains water blocking properties. Further, after the second pipe 16 is propelled, when another second pipe similar to the second pipe 16 is subsequently propelled, the same water-stopping property is given to the pipe and a part of the male joint.
[0027]
The space 52 above and below 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. 3 and 4. Both molds 58 and 60 are arranged after the second pipe 14 to be propelled first passes through the start opening 24 of the wellhead concrete 22.
[0028]
One mold 58 is made 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 tubes 14 and 16, and a lower end portion 66 having a small width. And a wide upper end 68. The mold 58 is disposed above the male joint 28 of the second tube 14, and the other mold 60 is disposed below the male joint 28.
[0029]
The other mold 60 is made of a steel plate member having an L shape as a whole, and has a single piece 70 that is symmetrical with the one mold 58 with respect to the web 34 of the male joint 28, and another piece perpendicular to the one piece 70. Part 72. Since the one piece 70 is substantially the same shape as the mold 58, the same reference numerals as those attached to the mold 58 are attached to both sides and upper and lower ends of the one piece 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.
[0030]
Both molds 58 and 60 are disposed behind the wellhead concrete 22 (rear in the propulsion direction) before propulsion of the first second pipe 16. At this time, the lower end 66 of one mold 58 and the upper end 66 of the other mold 60 are slightly separated from the web 34 of the male joint of the second pipe 16, respectively, and the respective molds 58, 60 are arranged. One side 62 is welded to the side of the first tube 14 that has already been propelled. At this time, a slight gap is generated between the other side portion 64 of each mold 58 and 60 and the second pipe 16. Thereby, the movement possibility of the 2nd pipe | tube 16 with respect to both mold forms is ensured. Further, the tip of the other piece 72 of the other mold 60 is brought into contact with the wellhead concrete 22 or the entrance packing 38. Thereby, the space 52 is defined.
[0031]
In the molds 58 and 60, that is, in the space 52 defined by the molds 58 and 60, the peripheral surfaces of the pipes 14 and 16, and the wellhead concrete or the entrance packing 38, the liquid resin, that is, polyurethane resin is used. Pour in a room temperature curable liquid resin. While filling the space 52, the liquid resin flows into the female joint 26 of the pipe through the slit 30 of the first pipe through which the web 34 of the male joint 28 of the second pipe passes, and fills this. . 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 interior of the female joint 26 is filled with, for example, clay at the front position of the entrance packing 38 and the rear positions of the molds 58 and 60. It is desirable to close with 74.
[0032]
5 and FIG. 6, the same molds 76 and 78 as the molds 58 and 60 used in the modes shown in FIG. 1 and FIG. 2 are used. However, one mold part 76 and one piece part of the other mold part 78 having one piece part and another piece part orthogonal to each other are different from each other in the form parts 58 and 60 according to the difference in the shape of the joint of the male and female. Have different shapes. That is, one piece of the formwork 76 and the formwork 78 includes a crank along a part of the outer surface part of the angle iron of the female joint 26 and a part of the inner surface part of the angle steel of the male joint 28, respectively. It has a lower end and an upper end of the shape.
[0033]
With reference to FIGS. 7 to 10, in the illustrated example, in addition to the periphery of the part of the male and female joints 26, 28 engaging with each other, the periphery of a part of the second pipe 16 in the shaft. An enclosing formwork 80 is also used.
[0034]
The formwork 80 includes a steel bending member 82 having a cylindrical portion, an outer edge that is fixed to one open end of the bending member 82, and has the same outer cross-sectional shape as the bending member 82 and the outer shape of the second tube 16. It consists of an annular steel plate member 84 having a slightly larger inner diameter.
[0035]
The curved member 82 has a diameter that is greater than the outer diameter of the second tube 16, preferably greater than the outer diameter of the entrance packing 38. The bending member 82 surrounds the second pipe 16, and the other open end is welded to the mold 25 of the steel-concrete concrete 22. Both ends of the bending member 82 in the circumferential direction are welded to the circumferential surface of the first tube 14 at positions above and below the slit 30. Further, the bending member 82 has an opening 88 for charging the liquid resin provided at the top thereof.
[0036]
On the other hand, the plate member 84 has a hole 90 that is substantially equal to the cross-sectional shape of a portion or front of the male joint 28 that allows the male joint 28 of the second tube 16 to pass therethrough. That is, in the mode shown in FIGS. 7 to 9, the straight hole 90 passes through the web 34 of the male joint 28, and in the mode shown in FIG. 10, the pair of angle-shaped holes 90 pass through the pair of angle steels. is there.
[0037]
Further, a part of the rail 36 (FIGS. 7 to 9) or a part of the female joint 26 (FIG. 10) is cut from the pipe end of the first pipe 14 protruding from the wellhead concrete 22 in the longitudinal direction. ing. The plate member 84 is in contact with and welded to the cut end of the rail 36 or the cut end of the female joint 26. For this reason, in this embodiment, the plate member 84 can dam the liquid resin flowing into the female joint 26. In order to prevent the liquid resin from leaking between the plate member 84 and the second tube 16, a ring-shaped seal member 92 that surrounds the second tube 16 and is in contact with the plate member 84 is disposed. Is desirable. In addition, in the embodiment shown in FIG. 5, a part of the female joint 26 can be cut out as necessary.
[0038]
When the liquid resin is poured into the mold 80 from the opening 88 of the mold 80, the space around the second pipe 16 defined by the mold 80, both the space above and below the joints 26 and 28, and the female shape. The internal space of the joint 26 is filled with the liquid resin, and the liquid resin solidifies with time. As described above, the liquid resin contacts and covers the entrance packing 38 and the plate 44 that supports it. Also in this embodiment, it is desirable that padding such as clay or rag cloth is applied in advance to the front region so that the liquid resin in the female joint 26 does not flow to the front region of the entrance packing 38.
[0039]
Since the liquid resin solidified product 94 also covers the surrounding space of the second pipe 16, to the peripheral surface of the second pipe 16 generated by blocking the groundwater flowing through the male and female joints 26, 28 that are engaged with each other. It is possible to prevent the groundwater from flowing in and the outflow of the groundwater into the shaft through the peripheral surface of the second pipe 16 associated therewith.
[0040]
The water stop structure and the water stop method described above can be applied between the access port in the reach shaft that receives the pipe propelled in the ground and the second pipe 16, and without using the shaft. It can be applied between the second pipe when propelled into the ground and its start or end.
[Brief description of the drawings]
FIG. 1 is a schematic front view of a water stop structure according to the present invention.
2 is a cross-sectional view taken along line 2-2 of FIG.
FIG. 3 is a front view of a formwork.
4 is a side view of the mold shown in FIG. 3. FIG.
FIG. 5 is a schematic front view of a water stop structure of another embodiment.
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.
8 is a cross-sectional view taken along line 8-8 of FIG.
9 is a plan view of the structure shown in FIG.
FIG. 10 is a schematic front view of a water stop structure of another embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Water stop structure 14 Earth retaining wall 16,18 1st and 2nd pipe | tube 20,22 Female joint and male joint 26 Sheet | seat 28 Fastener 30 Formwork 32 Solidified material of concrete or mortar

Claims (6)

A first pipe having a female joint having a slit extending in the longitudinal direction and press-fitted into the natural ground through the wellhead concrete, and a second pipe press-fitted into the natural ground parallel to the first pipe A water stop structure applied between the second pipe having a male joint that is passed through the slit of the female joint of the first pipe and engages with the female joint, Outside the natural ground, it has water-stopping and elasticity that fills a space around a part of both male and female joints that engage with each other and a part of the internal space of the female joint and is in contact with the wellhead concrete. Water-stop structure including solidified liquid resin. A first pipe having a female joint having a slit extending in the longitudinal direction and press-fitted into the natural ground through the wellhead concrete, and a second pipe press-fitted into the natural ground parallel to the first pipe A water stop structure applied between the second pipe having a male joint that is passed through the slit of the female joint and engages with the female joint, A space surrounding a part of both the male and female joints engaging with each other, a part of the internal space of the female joint, and a space surrounding a part of the second pipe, and the wellhead A water-stop structure including a solidified product of liquid resin having water-stop and elasticity in contact with concrete. The water stop structure according to claim 2, wherein the second pipe is press-fitted into a natural ground through an entrance packing attached to the wellhead concrete, and the solidified product of the liquid resin is in contact with the entrance packing. The water stop structure according to claim 1 or 2, wherein the liquid resin is made of a polyurethane resin. A first pipe having a female joint having a slit extending in the longitudinal direction and press-fitted into the natural ground through the wellhead concrete, and a second pipe press-fitted into the natural ground parallel to the first pipe A second pipe having a male joint that is passed through the slit of the female joint and engages with the female joint, and is provided outside the natural ground. , After installing a formwork that defines a space jointly with the wellhead concrete around a part of both the male and female joints that engage with each other, and in the formwork and the inside of the part of the female joint A water-stopping method in which a liquid resin that is a room-temperature-curable liquid resin and whose solidified product has water-stopping and elasticity is poured. A first pipe having a female joint having a slit extending in the longitudinal direction and press-fitted into the natural ground through the wellhead concrete, and a second pipe press-fitted into the natural ground parallel to the first pipe A second pipe having a male joint that is passed through the slit of the female joint and engages with the female joint, and is provided outside the natural ground. A mold for defining a space in cooperation with the wellhead concrete around a part of both joints of the male and female engaging with each other and around the part of the second pipe; And a water stopping method in which a liquid resin which is a room temperature curable liquid resin and has a water stopping property and elasticity is poured into the part of the female joint.

Images