JP7165958B1 - Reinforcement drainage system for retaining wall and Reinforcement drainage method for retaining wall - Google Patents

Abstract

A reinforcing drainage device capable of improving the reinforcing function and drainage function of a retaining wall is provided. A drain pipe 14 arranged from the outside C1 of the retaining wall 10 to the inside of the soil 11, a wall portion 25 provided at the tip of the drain pipe 14, and a drain pipe radially penetrating the drain pipe 14. A retaining wall reinforcement drainage device 12 having a drainage hole 23 provided, a tension member inserted into the drain pipe 14 and pulling the wall portion 25, and a third component 22 provided on the drain pipe 14 , a connection hole 26 provided in the wall portion 25, and a pumping pipe 17 for feeding the mortar capsule 27 into the internal space B1 of the third component portion 22. to the inner space B1 of the third component 22, and the inner diameter φ1 of the pumping pipe 17 is larger than the inner diameter φ2 of the connection hole 26 and larger than the outer diameter φ5 of the mortar capsule 27, and the connection hole 26 is smaller than the outer diameter φ5 of the mortar capsule 27 . [Selection drawing] Fig. 6

Description

TECHNICAL FIELD The present disclosure relates to a retaining wall reinforcement drainage device and a retaining wall reinforcement drainage construction method used in construction to reinforce a retaining wall and drain water from the retaining wall.

An example of technology used in construction to reinforce a retaining wall and drain water from the retaining wall is described in Patent Document 1. The slope stabilization device and construction method described in Patent Document 1 cuts a plurality of anchors whose tip side is fixed in the ground and whose head side is fixed to the slope surface, and slopes such as embankment slopes and earth retaining walls. It is reinforced by being buried in the mountains. Further, the anchor includes a hollow tubular body having a large number of penetrating water collecting holes, and a water-permeable drainage material provided on the outer periphery of the hollow tubular body other than the tip-end-side fixing portion.

Further, the hollow pipe was driven into the ground so that the tip side was positioned higher than the head side, and groundwater in the ground was taken into the hollow pipe through the drainage material and the water collection hole. Patent Literature 1 describes that the liquid is later discharged outside by flowing down in the hollow tubular body. The hollow tubular body has a plurality of reinforcing ribs protruding outward at predetermined intervals in the circumferential direction and extending in the axial direction on the inner and outer peripheral surfaces, and the anchor is installed in the ground. A drainage material and a hollow pipe are inserted into the drilled hole formed in the . After that, grout material (mortar) is injected from the tip side of the hollow tube toward the ground through an injection pipe installed in the hollow tube, and hardened to fix the tip side in the ground. This is described in Patent Document 1.

Japanese Patent No. 4296660

The inventors of the present application have recognized the problem that the slope stabilization device and construction method described in Patent Document 1 still have room for improvement in terms of the retaining wall reinforcement function and drainage function.

An object of the present disclosure is to provide a retaining wall reinforcement drainage device and a retaining wall reinforcement drainage construction method capable of improving the reinforcement function and drainage function of the retaining wall.

The present disclosure includes a drain pipe arranged from the outside of a retaining wall to the inside of soil, a wall portion provided at a tip of a portion of the drain pipe that is arranged inside the soil, and the drain pipe. and a drainage hole radially penetrating through a portion located inside the soil between the wall portion and the retaining wall, and connecting the outside and the inside of the drain pipe. inserted into the drain pipe and connected to the wall to pull the wall toward the retaining wall in a direction along the center line of the drain pipe. a tension member; and an enlarged diameter portion provided between the wall portion and the drain hole of the drain pipe and opening outward in the radial direction of the drain pipe when the wall portion is pulled. a connection hole provided in the wall and to which the tension member is connected; a transporting pipe inserted inside and feeding the mortar capsule into the inner space of the enlarged diameter portion, wherein the entire length of the transporting pipe in the direction along the centerline extends from the outside of the retaining wall. The inner diameter of the transportation pipe is larger than the inner diameter of the connection hole and the outer diameter of the mortar capsule, and the inner diameter of the connection hole is the same as the mortar. smaller than the outer diameter of the capsule.

According to the present disclosure, the reinforcing function and drainage function of the retaining wall can be further improved.

(A) and (B) are side cross-sectional views showing a first step of a retaining wall reinforcement drainage construction method. FIG. 4 is a cross-sectional view of the elements that make up the reinforcing drainage device of the retaining wall; (A) and (B) are side cross-sectional views showing the first half of the second step. (A) is a side cross-sectional view showing the second half of the second step, and (B) is a side cross-sectional view showing the first half of the third step. (A) is a side cross-sectional view showing the second half of the third step, and (B) is a side cross-sectional view showing the fourth step of the retaining wall reinforcement drainage construction method. It is side sectional drawing which shows the first half of the 5th process of the reinforcement drainage construction method of a retaining wall. It is side sectional drawing which shows the second half of the 5th process of the reinforcement drainage construction method of a retaining wall.

Embodiments of a retaining wall reinforcing drainage device and a retaining wall reinforcing drainage method (reinforcing drainage method) according to the present disclosure will be described with reference to the drawings. In all the drawings for describing the embodiments, the same parts are in principle given the same reference numerals, and repeated descriptions thereof will be omitted.

[Reinforcing drainage system for retaining walls]
As shown in FIG. 1, the retaining wall 10 is provided along one surface of the soil 11 in the height direction. The soil 11 may be any of a slope, cut soil, mound soil, and the like. Soil 11 is general earth and sand or ground except for soft rock and hard rock. The retaining wall 10 may be made of any of reinforced concrete, plain concrete, sheet piles made of steel plates, and the like. FIG. 2 shows a reinforcing drainage system used for reinforcing and draining the retaining wall 10. As shown in FIG. The reinforcing drainage device 12 has a self-propelled piercing machine 13, a drain pipe 14, a pull rod 15, a pumping pipe 17, and a center hole jack 16 shown in FIG. 4(B). The self-propelled drilling machine 13 has a piston operated by compressed air of an air compressor and a main body head portion 18 that is struck by the piston. is crushed to form an excavation hole 19 in the soil 11 as shown in FIG. 1(B).

The drain pipe 14 shown in FIG. 2 is a member arranged in an excavation hole 19 formed in the soil 11, and the drain pipe 14 is made of metal such as iron or aluminum. The drain pipe 14 is a member centered on the center line A1, and the drain pipe 14 is provided by connecting a plurality of components to each other. The drain pipe 14 has a first component 20, a second component 21, and a third component 22, for example. As shown in FIG. 3A, the first constituent portion 20, the second constituent portion 21, and the third constituent portion 22 are all arranged around the center line A1, and are arranged in a direction along the center line A1. arranged in one row. The second component 21 is arranged between the first component 20 and the third component 22 . The first constituent portion 20 and the second constituent portion 21 are screwed together, and the second constituent portion 21 and the third constituent portion 22 are screwed together. Therefore, the first component 20 and the second component 21 are detachable, and the second component 21 and the third component 22 are detachable.

The second component portion 21 is provided with a drain hole 23 along the entire circumference. The drain hole 23 is a slit, and the drain hole 23 penetrates the second component 21 in the radial direction. A plurality of drain holes 23 are provided at intervals in the direction along the center line A1, and a plurality of drain holes 23 are provided at intervals in the circumferential direction of the second component portion 21 . The third component portion 22 has a plurality of arm pieces 24 , and the plurality of arm pieces 24 are provided at intervals in the circumferential direction of the third component portion 22 . All arm pieces 24 are provided with cuts, and each arm piece 24 can be bent outward in the radial direction of the drain pipe 14 as shown in FIG. It is possible.

Also, as shown in FIG. 3A, the tip of the drain pipe 14, that is, the end of the third component 22, opposite to the end to which the second component 21 is connected in the direction along the center line A1. A wall 25 is fixed to the located end. The wall portion 25 is annular and fixed to the third component portion 22 by welding. In other words, the wall portion 25 is connected to the end portions of the plurality of arm pieces 24 . The wall 25 is made of metal, for example steel or aluminum. The wall portion 25 is for crushing the mortar capsule 27 shown in FIG. The wall portion 25 has a connection hole 26 centered on the center line A1, and the inner peripheral surface of the connection hole 26 is provided with an engaging portion such as a female screw. In a state in which the arm piece 24 of the third component portion 22 is not bent, the first component portion 20, the second component portion 21 and the third component portion 22 have the same inner diameter, and the first component portion 20 and the second component portion 22 have the same inner diameter. The component part 21 and the third component part 22 have the same outer diameter.

The pull rod 15 shown in FIG. 3A is a tool for bending the arm piece 24 of the third component 22, and the pull rod 15 is made of metal, for example, steel. The pull rod 15 has a total length L1 along the center line A1 that is greater than the total length L2 of the drain pipe 14 along the center line A1. An engaging portion such as a male thread is provided on the outer peripheral surface of the tip 28 of the pull rod 15 . Rotating the drawbar 15 about the centerline A1 causes the male thread of the drawbar 15 to engage with the female thread of the connecting hole 26, and the male thread of the drawbar 15 to disengage from the female thread of the connecting hole 26; is possible.

The center hole jack 16 shown in FIG. 4B is a device that grips the pull bar 15 and uses hydraulic pressure to pull the pull bar 15 in the direction along the center line A1 with a predetermined stroke. The pumping pipe 17 is a tool for sending the mortar capsule 27 to the internal space B1 of the third component 22, as shown in FIG. The pumping pipe 17 is made of hard synthetic resin such as polyethylene resin. The inner diameter φ1 of the transport hole 29 of the pumping pipe 17 is larger than the inner diameter φ2 of the connection hole 26 . As shown in FIG. 5B, the total length L3 of the pumping pipe 17 in the direction along the center line A1 is greater than the total length L4 of the first component 20 and the second component 21 in the direction along the center line A1. .

[Reinforcing drainage method for retaining walls]
Next, an example of construction for reinforcing the retaining wall 10 with the reinforcing drainage device 12 and draining the soil 11 will be described.

(First step)
First, using a core punching machine (not shown), an insertion hole 30 centered on the center line A2 is formed in the retaining wall 10 as shown in FIG. 1(A). The inner diameter of the insertion hole 30 is larger than the outer diameter of the self-propelled boring machine 13 . Then, as shown in FIG. 1B, the self-propelled piercing machine 13 is inserted into the insertion hole 30, and the self-propelled piercing machine 13 is moved in the direction along the center line A2 to a previously designed position. Advance to form a borehole 19 in the soil 11 . After that, the self-propelled drilling machine 13 is retreated in the excavation hole 19 and extracted from the soil 11 and the retaining wall 10 . The drilled hole 19 provided in the soil 11 may have its centerline A2 parallel to the horizontal line, or may be inclined with respect to the horizontal line such that the centerline A2 is higher at the far end than at the entrance. An acute angle of inclination of the center line A1 with respect to the horizontal line is, for example, 1 degree.

(Second step)
In the second step performed after the first step, the drain pipe 14 and the tension rod 15 shown in FIG. attach temporarily. The fixing plate 31 is made of metal, for example steel, and has a shaft hole 32 . After the drain pipe 14 and the pull rod 15 are arranged coaxially around the center line A1 and arranged side by side in the direction along the center line A1, the pull rod 15 is inserted into the shaft hole 32. After the tip 28 of the pull rod 15 is passed through the internal space B2 of the first component 20, the internal space B3 of the second component 21, and the internal space B1 of the third component 22, the pull rod 15 is rotated. to engage the male thread of the tip 28 of the pull rod 15 with the female thread of the wall portion 25 to connect the pull rod 15 to the wall portion 25 as shown in FIG. 3(B). At this point, the arm piece 24 of the third component 22 is extended in the direction along the centerline A1.

As shown in FIG. 3B, the center line A1 of the drain pipe 14 and the center line A2 of the drilled hole 19 are arranged coaxially, and the drain pipe 14 is moved along the center line A1. After the drain pipe 14 is inserted into the excavation hole 19, the drain pipe 14 is stopped as shown in FIG. 4(A). When the drain pipe 14 is stopped, part of the first component 20 and the fixing plate 31 are positioned outside C1 of the retaining wall 10 . In the second step, only the drain pipe 14 may be inserted into the excavated hole 19 in advance, and then the pull rod 15 may be inserted into the drain pipe 14 and connected to the wall portion 25 .

(Third step)
In the third step performed after the second step, the pull rod 15 is gripped by the center hole jack 16 shown in FIG. Stop the drawbar 15 . During this process, the fixing plate 31 is pressed against the outer surface of the retaining wall 10 . In addition, the traction force applied to the pull bar 15 is transmitted to the wall portion 25, and the wall portion 25 moves toward the second component portion 21 by a predetermined amount in the direction along the center line A1, and as shown in FIG. The wall portion 25 stops like this. In the process of moving the wall portion 25, the plurality of arm pieces 24 are respectively bent outward about the center line A1 and stopped. That is, within a plane perpendicular to the center line A1, the plurality of arm pieces 24 are arranged radially around the center line A1 at regular intervals. In this way, the volume of the internal space B1 of the third component portion 22 is expanded (diameter expanded) outward from the center line A1.

The center hole jack 16 is then removed and the drawbar 15 is rotated to remove the drawbar 15 from the wall 25 . Further, the pull rod 15 is pulled out from the drain pipe 14 as shown in FIG. 5(A). Also, the fixing plate 31 is removed from the drain pipe 14 .

(Fourth step)
In the fourth step performed after the third step, as shown in FIG. 5B, the pumping pipe 17 is arranged around the center line A1. Then, the pressure-feeding pipe 17 is inserted into the drain pipe 14, and the pressure-feeding pipe 17 is stopped as shown in FIG. The tip of the pressure-feeding pipe 17 is positioned in the internal space B1 of the third component 22, and a portion of the pressure-feeding pipe 17 is positioned outside C1 of the retaining wall 10. As shown in FIG. After the mortar capsule 27 is put into the transport hole 29 of the pressure-feeding pipe 17 , compressed air is discharged from the air compressor connected to the pressure-feeding pipe 17 . Then, the mortar capsule 27 is pressure-fed to the internal space B1 by the air pressure. The mortar capsule 27 collides with the wall portion 25 and is crushed, and as shown in FIG. Also, the mortar 33 is solidified in the internal space B1. Further, the pumping pipe 17 is extracted from the drain pipe 14 , and the loofah material 34 is arranged inside the drain pipe 14 , specifically, in the internal space B<b>2 of the first component 20 . After that, when the fixing plate 31 is attached to the end of the drain pipe 14, the work of reinforcing and draining the retaining wall 10 is completed.

[Effects of Embodiment]
When the reinforcement drainage construction method of the present disclosure is performed, as shown in FIG. 7, the mortar 33 fills the internal space B1 of the third component 22, and the diameter of the plurality of arm pieces 24 of the third component 22 is expanded. . The outer diameter φ3 of the plurality of arm pieces 24 in the open state is larger than the outer diameter φ4 of the portion of the drain pipe 14 between the plurality of arm pieces 24 and the retaining wall 10 . Therefore, when the drain pipe 14 receives a force in the direction along the center line A1 in a direction to pull out of the soil 11, the third component 22, specifically, the plurality of arm pieces 24, is pulled out of the soil 11. is engaged. Therefore, it is possible to prevent the drain pipe 14 from slipping out of the soil 11 , and to stably secure and reinforce the state in which the retaining wall 10 is attached to the soil 11 . Water in the soil 11 enters the drain pipe 14 through the drain hole 23, and water in the drain pipe 14 passes through the internal space B2 of the first component 20 to the outside C1 of the retaining wall 10. Ejected.

Furthermore, since the loofah material 34 is arranged in the internal space B2, it is possible to prevent a snake from entering the drain pipe 14 and a honeycomb to be formed inside the drain pipe 14.例文帳に追加Therefore, clogging of the drain pipe 14 can be prevented, and deterioration of the drainage function of the drain pipe 14 can be suppressed. Note that the loofah material 34 can also be arranged over the internal space B2 and the internal space B3. By doing so, it is possible to prevent a part of the soil 11 from clogging the drainage hole 23, and to further suppress deterioration of the drainage function.

By the way, during the process of reinforcing and draining the retaining wall 10 , the tip of the pumping pipe 17 is placed in the internal space B<b>1 of the third component 22 . That is, the pumping pipe 17 is positioned inside the drain hole 23 of the second component 21 . Therefore, part of the mortar 33 can be prevented from entering the drain hole 23 when the mortar capsule 27 bursts in the internal space B1. Therefore, it is possible to prevent the drainage function of the drainage hole 23 from deteriorating. Further, the entire mortar 33 can be reliably retained in the internal space B1, the drain pipe 14 is less likely to come off the soil 11, and the reinforcing function of the retaining wall 10 is improved. Further, the inner diameter φ2 of the connection hole 26 of the wall portion 25 is smaller than the inner diameter φ1 of the pumping pipe 17 and smaller than the outer diameter φ5 of the mortar capsule 27 . Therefore, the mortar capsule 27 reliably collides with the wall portion 25 and is crushed in the internal space B<b>1 of the third component portion 22 . Therefore, it is possible to suppress deterioration of the function of reinforcing the retaining wall 10 .

[Supplementary information]
An example of the technical meaning of the items described in this embodiment is as follows. The reinforcement drainage device 12 is an example of a reinforcement drainage device. Retaining wall 10 is an example of a retaining wall, and soil 11 is an example of soil. Drain pipe 14 is an example of a drain pipe. The wall portion 25 is an example of a wall portion. The second component part 21 is an example of "a part of the drain pipe that is arranged inside the soil between the wall part and the retaining wall". The drain hole 23 is an example of a drain hole. Centerline A1 is an example of the centerline of the drain pipe. The pull bar 15 is an example of a pull member. The third component part 22 is an example of "between the wall part and the drain hole of the drain pipe". The plurality of arm pieces 24 are an example of an enlarged diameter portion. The connection hole 26 is an example of a connection hole.

The internal space B1 is an example of the "internal space of the enlarged diameter portion". Mortar capsule 27 is an example of a mortar capsule. The pumping pipe 17 is an example of a transportation pipe. The total length L3 of the pumping pipe 17 is an example of "the total length of the transportation pipe". The inner diameter φ1 of the transport hole 29 of the pumping pipe 17 is an example of the "inner diameter of the transport pipe". The inner diameter φ2 of the connection hole 26 is an example of the "inner diameter of the connection hole". The outer diameter φ5 of the mortar capsule 27 is an example of the "outer diameter of the mortar capsule".

The reinforcement drainage device and the reinforcement drainage construction method of this embodiment can be used in construction to reinforce a retaining wall and drain water from the retaining wall.

DESCRIPTION OF SYMBOLS 10... Retaining wall 11... Soil 12... Reinforcing drainage device 14... Drain pipe 15... Pull rod 17... Pumping pipe 21... Second constituent part 22... Third constituent part 23... Drainage hole, 24 Arm piece 25 Wall portion 26 Connection hole 27 Mortar capsule A1 Center line B1 Internal space L3 Overall length φ1, φ2 Internal diameter φ5 External diameter

Claims (3)

a drain pipe extending from the outside of the retaining wall to the inside of the soil;
a wall portion provided at a tip of a portion of the drain pipe that is disposed inside the soil;
A drainage hole radially penetrating a portion of the drain pipe that is disposed inside the soil between the wall portion and the retaining wall, and connecting the outside and the inside of the drain pipe. When,
In a retaining wall reinforcement drainage system comprising:
a tension member inserted inside the drain pipe and connected to the wall to pull the wall in a direction along the centerline of the drain pipe to bring the wall closer to the retaining wall;
an enlarged diameter portion of the drain pipe provided between the wall portion and the drain hole and opening outward in the radial direction of the drain pipe when the wall portion is pulled;
a connection hole provided in the wall and to which the tension member is connected;
A transportation pipe that is inserted into the drain pipe after the wall portion is pulled and the pulling member is pulled out from the inside of the drain pipe, and feeds the mortar capsule into the inner space of the enlarged diameter portion. When,
has
The total length of the transportation pipe in the direction along the center line has the total length from the outside of the retaining wall to the inner space of the enlarged diameter portion,
The inner diameter of the transportation pipe is larger than the inner diameter of the connection hole and the outer diameter of the mortar capsule,
The inner diameter of the connection hole is smaller than the outer diameter of the mortar capsule,
Reinforcing drainage system for retaining walls. In the reinforcing drainage device for retaining wall according to claim 1,
The enlarged diameter portion has a plurality of arm pieces arranged in the circumferential direction of the drain pipe,
the plurality of arm pieces are each opened outward in the radial direction of the drain pipe when the wall portion is pulled;
The retaining wall reinforcement drainage device, wherein an outer diameter of the plurality of arm pieces in an opened state is larger than an outer diameter of a portion of the drain pipe between the enlarged diameter portion and the retaining wall. a first step of forming an insertion hole penetrating the retaining wall and forming an excavation hole in the soil leading to the insertion hole;
A tension member is inserted into a drain pipe which is performed after the first step and has a wall portion at the tip and a drain hole between the tip and the rear end, and the tension member is attached to the wall. a second step of arranging the drain pipe over the insertion hole and the excavation hole in a state in which the tension member and the wall are connected by inserting the drain pipe into the connection hole of the part;
After the second step, by pulling the pulling member in a direction along the center line of the drain pipe, the enlarged diameter portion provided between the drain hole and the wall portion is directed outward. a third step of extracting the tension member from the inside of the drain pipe after expanding the diameter by
After the third step, a transportation pipe having an inner diameter larger than the inner diameter of the connection hole is inserted into the drain pipe to dispose the tip of the drain pipe in the inner space of the enlarged diameter portion. a fourth step;
The mortar capsule having an outer diameter smaller than the inner diameter of the transportation pipe and larger than the inner diameter of the connection hole is pumped into the transportation pipe, which is performed after the fourth step, so that the mortar capsule is transported into the transportation pipe. a fifth step of extracting the transportation pipe from the inside of the drain pipe after crushing it by colliding with the wall portion and filling the internal space of the enlarged diameter portion with mortar;
Reinforcing drainage construction method for retaining walls.

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