Retaining wall repair method and repair tool used therefor

Abstract

The object of the present invention is to provide a method for repairing a retaining wall, which efficiently repairs the retaining wall while ensuring the drainage of the wall, and a repair tool used therefor. [Solution] The method of repairing a retaining wall comprises a filler injection step of injecting filler 70 into the interior of retaining wall 50 through gaps 55 present in retaining wall 50; a confirmation step of confirming that filler 70 has not infiltrated into an observation area located at the rear longitudinal side of drainage pipe 60 arranged on retaining wall 50; and a treatment step comprising a filler removal step of removing filler 70 present in the observation area with removal parts 15a, 15b of repair tool 1 if filler 70 has infiltrated into the observation area in the confirmation step; and a filter attachment step of attaching a drainage filter to the rear longitudinal side of drainage pipe 60 after the treatment step.

Description

[Technical field]

[0001] This invention relates to a method for repairing retaining walls and repair tools used therefor, and in particular to a method for repairing retaining walls made of stone masonry, concrete blocks, etc. (including a reinforcement method) and repair tools used when repairing retaining walls. [Background technology]

[0002] Traditionally, there have been many types of retaining walls, including concrete walls, block walls, and stone masonry walls, but as they deteriorate over time, cracks in the masonry and the flow of stones and soil inside the wall occur, causing the strength of the walls to decrease. Some old walls do not have drainage pipes, and in such cases, soil containing rainwater and other elements exerts a greater than usual earth pressure on the outside of the wall, which can lead to the collapse of the wall. For this reason, there has been an increased need to repair and reinforce these types of retaining walls in recent years.

[0003] For example, when repairing a retaining wall without a drainage pipe, it is necessary to attach a drainage pipe later to ensure the drainage of the retaining wall. In this case, a filter is attached to the end of the drainage pipe located at the back side of the retaining wall to prevent the outflow of soil and sand. However, in order to achieve a stable attachment state to the drainage pipe, it is common to use a filter whose maximum diameter of the frame is larger than the diameter of the drainage pipe. Therefore, the procedure is to first attach the filter to the end of the drainage pipe located at the back side of the retaining wall from the outside of the drainage pipe, and then install the drainage pipe on the retaining wall, and it was difficult to attach a filter to a drainage pipe that was previously installed on the retaining wall. Even if a drainage pipe is already installed on the retaining wall, when a reinforcing filler made of mortar or the like is poured into the cracks of the retaining wall, the filler may flow into the filter attached to the back side of the drainage pipe or the back end of the drainage pipe. In this case, it was not easy to take measures such as removing the flowed-in filler or replacing the filter.

[0004] One method for solving the above-mentioned problems is described, for example, in Patent Document 1. The invention described in Patent Document 1 is a reinforcement method for masonry retaining walls, which is characterized by having a step of inserting drainage members at predetermined intervals from the joints of the masonry retaining walls until they reach the innermost part of the cavity, a step of inserting a nozzle through the joints of the masonry walls and injecting and foaming a foaming solidification agent through the nozzle into the inner wall of the cavity to form a barrier wall that covers the entire inner wall surface, and a step of injecting a filler material into the cavity through the joints of the masonry walls after the foaming solidification agent of the barrier wall has solidified, to fill the cavity. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2015-040463 A Summary of the Invention [Problem to be solved by the invention]

[0006] The method of reinforcing a masonry retaining wall shown in Patent Document 1 uses a foaming solidifying agent to form a barrier that covers the entire inner wall surface of the cavity in the masonry retaining wall, thereby preventing filler such as mortar from penetrating into the backfill stones, and reinforcing the masonry retaining wall while maintaining the drainage of the masonry retaining wall. In addition, instead of a typical drainage pipe, a long permeable mat covered with a waterproof sheet is used as the drainage member, and there is no need to attach a filter. However, a foaming solidifying agent is required in addition to the normal filler, and each of them needs to be injected separately into the masonry retaining wall, which is time-consuming.

[0007] The object of this invention is to provide a method for repairing a retaining wall, which can efficiently repair the wall while ensuring the drainage of the wall by using ordinary drainage pipes and filters without using a special foaming solidification agent as in Patent Document 1, and a repair tool to be used therein. [Means for solving the problem]

[0008] In order to achieve the above-mentioned object, the invention described in claim 1 is a method for repairing a retaining wall, comprising: a filler injection step of injecting filler into the interior of the retaining wall through gaps in the retaining wall or holes formed in the retaining wall; a confirmation step of confirming through a drainage pipe that filler has not penetrated into an observation area located at the rear of a drainage pipe arranged in the retaining wall in the longitudinal direction; a treatment step of, if filler has penetrated into the observation area in the confirmation step, taking measures to prevent the invaded filler from being present in the observation area; and a filter attachment step of attaching a filter to the rear of the drainage pipe in the longitudinal direction after the confirmation step or treatment step has been performed.

[0009] With this configuration, drainage from the drain pipe is not impeded after the retaining wall is repaired.

[0010] The invention described in claim 2 is the same as the invention described in claim 1, in which the treatment step includes removing the filler that has entered the observation area through the water drainage pipe.

[0011] With this configuration, the filler can be easily removed from the back side of the drain pipe.

[0012] The invention described in claim 3 is the same as the invention described in claim 1, in which the treatment step includes moving the water drainage pipe to a position where no filler that has invaded the observation area is present.

[0013] With this configuration, no filler is present in the observation area.

[0014] The invention described in claim 4 is the same as the configuration of the invention described in claim 1, and further includes a pipe installation step of installing a drainage pipe prior to the filler injection step if a drainage pipe is not installed in the retaining wall.

[0015] With this configuration, the confirmation process can be carried out quickly.

[0016] The invention described in claim 5, in the configuration of the invention described in claim 1, further includes an existing filter removal step of removing the existing filter prior to the filling material injection step if an existing filter is attached to the drainage pipe arranged in the retaining wall.

[0017] With this configuration, the confirmation process can be carried out quickly.

[0018] The invention described in claim 6 is a repair tool consisting of a pair of long members used in the retaining wall repair method described in claim 1, comprising a clamping portion provided at one longitudinal end of the pair of long members and capable of clamping a filter, a gripping portion provided at the other longitudinal end of the pair of long members and formed to be gripped, and a connecting portion between the clamping portion and the gripping portion, which axially supports and connects the long members to each other so that they can be opened and closed freely, and is configured so that when the filter is clamped, the long members can move relative to each other in the longitudinal direction.

[0019] With this configuration, it is easy to adjust the position of the filter while it is still being clamped.

[0020] The invention as set forth in claim 7 is the same as the invention as set forth in claim 6, in which the clamping portion further includes a removal portion capable of removing the filler.

[0021] With this configuration, it is possible to carry out a treatment step using the removal section.

[0022] The invention as recited in claim 8 is the same as the invention as recited in claim 6, in which an illumination unit capable of illuminating an observation area is provided on the clamping unit side.

[0023] With this configuration, the situation in the observation area can be confirmed more clearly.

[0024] The invention described in claim 9 is a method for repairing a retaining wall using the repair tool described in claim 6, wherein the drainage pipe is cylindrical, and the filter is a disk-shaped frame having a flexible flange portion on its peripheral portion, with the filter body attached to it, and the filter installation process includes a clamping process in which the frame of the filter is clamped with the repair tool, an attitude adjustment process in which the attitude of the filter is adjusted so that it is inclined with respect to the longitudinal direction of the drainage pipe by moving the long members of the repair tool relative to each other in the longitudinal direction, an insertion process in which the filter whose attitude has been adjusted is inserted from the front side to the rear side of the drainage pipe by inserting the repair tool into the drainage pipe, and an fitting process in which the inserted filter is adjusted to a position abutting the rear end of the drainage pipe and fitted into the rear end, and then the clamped state is released.

[0025] When configured in this manner, the height length from the upper end to the lower end of the flange portion of the filter when its posture is adjusted is shorter than the height length of the inner diameter of the drain pipe, reducing resistance when inserting the filter and making it easier to attach the filter to the drain pipe.

[0026] The invention described in claim 10 is a method for repairing a retaining wall using the repair tool described in claim 6, further comprising an existing filter removal step of removing the existing filter prior to the filler injection step when an existing filter is attached to a drainage pipe arranged on the retaining wall, the filter in the filter installation step being a new filter different from the existing filter, the drainage pipe being cylindrical in shape, and each of the existing filter and the new filter being a filter body attached to a frame body that is disk-shaped and has a flexible flange portion on its peripheral portion, and the existing filter removal step includes a first clamping step of clamping the frame body of the existing filter by inserting the repair tool into the drainage pipe, and a second clamping step of changing the posture of the clamped existing filter to that of the drainage pipe by moving the long members of the repair tool relative to each other in the longitudinal direction. The filter installation process includes a first posture adjustment process in which the filter is adjusted so that it is inclined relative to the lengthwise direction, and a pulling out process in which the repair tool is pulled out of the drain pipe to pull the existing filter, whose posture has been adjusted, from the back side of the drain pipe to the front side.The filter installation process includes a second clamping process in which the frame of the new filter is clamped with the repair tool, a second posture adjustment process in which the posture of the new filter is adjusted so that it is inclined relative to the lengthwise direction of the drain pipe by moving the long members of the repair tool relatively to each other in the longitudinal direction, an insertion process in which the new filter, whose posture has been adjusted, is inserted from the front side to the back side of the drain pipe by inserting the repair tool into the drain pipe, and an insertion process in which the inserted new filter is adjusted to a position where it abuts against the back end of the drain pipe and fitted into the back end, and then the clamped state is released.

[0027] With this configuration, the height length from the upper end to the lower end of the flange portions of the existing filter and the new filter whose posture has been adjusted is shorter than the height length of the inner diameter of the water drain pipe, reducing resistance when pulling out the existing filter and inserting the new filter, making it easier to replace the filter in the water drain pipe. Effect of the Invention

[0028] As explained above, the invention described in claim 1 does not impede drainage from the drainage pipe after repairing the retaining wall, thereby providing an efficient repair method while ensuring drainage.

[0029] The invention as recited in claim 2 has the same effect as the invention as recited in claim 1, and in addition, since the filling material can be easily removed from the back side of the drainage pipe, the drainage of the retaining wall can be easily ensured.

[0030] The invention as recited in claim 3 has the same effect as the invention as recited in claim 1, and in addition, since no filler is present in the observation area, the drainage of the retaining wall can be more reliably ensured.

[0031] The invention as recited in claim 4 has the same effect as the invention as recited in claim 1, and in addition, it allows the confirmation process to be carried out quickly, resulting in a more efficient method of repairing retaining walls.

[0032] The invention as recited in claim 5 has the same effect as the invention as recited in claim 1, and in addition, it enables the confirmation process to be carried out quickly, resulting in a more efficient method of repairing retaining walls.

[0033] The invention as recited in claim 6 has the effect of the invention as recited in claim 1, and in addition, makes it easier to adjust the position of the filter while it is still being clamped, facilitating the filter attachment process.

[0034] The invention as recited in claim 7 has, in addition to the effect of the invention as recited in claim 6, the treatment step can be performed using the removal section, so that the treatment step can be easily performed.

[0035] The invention as recited in claim 8 has the effect of the invention as recited in claim 6, and furthermore, since the state of the observation area can be confirmed more clearly, the confirmation process can be easily carried out.

[0036] The invention described in claim 9 has the effect of the invention described in claim 6, and in addition thereto, the height length from the upper end to the lower end of the flange portion of the filter, which has been adjusted in position, is shorter than the height length of the inner diameter of the drain pipe. This reduces the resistance when inserting the filter, making it easier to attach the filter to the drain pipe. This enables the filter attachment process to be carried out quickly, resulting in a more efficient method of repairing retaining walls.

[0037] The invention described in claim 10, in addition to the effects of the invention described in claim 6, has the following features: the height direction length from the upper end to the lower end of the flange portion of the existing filter and the new filter, whose posture has been adjusted, is shorter than the height direction length of the inner diameter of the drain pipe. This reduces the resistance when pulling out the existing filter and inserting the new filter, making it easier to replace the filter with respect to the drain pipe. This enables the existing filter removal process and the filter installation process to be carried out quickly, resulting in a more efficient method of repairing retaining walls. [Brief description of the drawings]

[0038] [Figure 1] 1 is a schematic diagram showing a retaining wall structure according to a first embodiment of the present invention. [Diagram 2] FIG. 1 is a schematic front view of a repair tool according to a first embodiment of the present invention. [Diagram 3] FIG. 3 is a schematic rear view of the repair tool shown in FIG. 2. [Figure 4] 3 is a schematic diagram showing a state in which a pair of elongated members of the repair tool shown in FIG. 2 are moved relatively to each other in the longitudinal direction. FIG. [Diagram 5] 3 is a schematic diagram showing a state in which the repair tool shown in FIG. 2 is in an open state. FIG. [Figure 6] FIG. 1 is a diagram showing a method for repairing a retaining wall according to a first embodiment of the present invention, in which (1) is a schematic diagram showing a filler injection process for injecting filler into the interior of a retaining wall and a confirmation process for confirming the condition of the observation area, and (2) is a schematic diagram showing the condition of the observation area observed from the front side of the drainage pipe. [Figure 7]FIG. 2 is a diagram showing a method for repairing a retaining wall according to the first embodiment of the present invention, and is a schematic diagram showing a treatment process for preventing filling material that has invaded the observation area from being present in the observation area. [Figure 8] FIG. 1 is a diagram showing a method for repairing a retaining wall according to a first embodiment of the present invention, in which (1) is a schematic diagram showing the condition of the observation area after the treatment process has been carried out, and (2) is a schematic diagram showing the condition of the observation area observed from the front side of the drainage pipe. [Figure 9] 1A and 1B are schematic diagrams of a filter according to a first embodiment of the present invention, in which (1) is a schematic perspective view and (2) is a schematic bottom view. [Figure 10] These figures show the filter installation process of the retaining wall repair method according to the first embodiment of this invention, where (1) is a schematic diagram showing the clamping process in which the filter is clamped by a repair tool, and (2) is a schematic diagram showing the posture adjustment process in which the posture of the clamped filter is adjusted so that it is inclined relative to the longitudinal direction of the drain pipe. [Figure 11] 10A and 10B are diagrams showing the filter installation process of the retaining wall repair method according to the first embodiment of the present invention, in which (1) is a schematic diagram showing the intermediate state of the insertion process in which the filter whose posture has been adjusted in FIG. 10 is inserted into the drain pipe, and (2) is a schematic diagram showing the fitting process in which the inserted filter is fitted into the drain pipe and then the filter is released from its clamped state by the repair tool. [Figure 12] These figures show the existing filter removal process of the retaining wall repair method according to the second embodiment of the present invention, where (1) is a schematic diagram showing the first clamping process in which the filter is clamped by a repair tool, and (2) is a schematic diagram showing the first attitude adjustment process and the first attitude fixing process in which the attitude of the clamped filter is adjusted so that it is inclined relative to the longitudinal direction of the drain pipe. [Figure 13] 12A and 12B are diagrams showing the existing filter removal process of the retaining wall repair method according to the second embodiment of the present invention, in which (1) is a schematic diagram showing the intermediate state of the extraction process in which the filter whose posture has been adjusted in FIG. 12 is pulled out from the drain pipe, and (2) is a schematic diagram showing the completed state of the extraction process in which the filter has been completely pulled out from the drain pipe. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0039] FIG. 1 is a schematic diagram showing a retaining wall structure according to a first embodiment of the present invention.

[0040] Referring to FIG. 1, the retaining wall 50 is a dry-stone masonry retaining wall, and is depicted in a schematic manner. At the front (left side of FIG. 1), a number of piled stones 51 are piled diagonally upward toward the back (right side of FIG. 1). At the back of the piled stones 51, a padding stone 52 is sandwiched to stabilize the piled state of the piled stones 51. Although the padding stone 52 is not specifically depicted in FIG. 1, it is assumed that some of the padding stones 52 have fallen off, creating a cavity. At the back of the padding stone 52, a backfill stone 53 is arranged as a permeable layer of the retaining wall, and further back there is soil 54. In the retaining wall 50, a number of cylindrical drainage pipes 60 are installed at predetermined intervals, penetrating from the surface of the piled stones 51 to the backfill stone 53. No drainage filter is attached to the drainage pipe 60. Furthermore, since the adjacent piled stones 51 are not sealed with joints or the like, there are gaps 55 between the piled stones 51.

[0041] FIG. 2 is a schematic front view of the repair tool according to the first embodiment of the present invention, and FIG. 3 is a schematic rear view of the repair tool shown in FIG.

[0042] 2 and 3 in addition to FIG. 1, the repair tool 1 is composed of a pair of elongated members 3a and 3b punched from a steel plate, and can hold a filter for a drain pipe, which will be described later. The elongated members 3a and 3b are set so that their longitudinal lengths are longer than the length of the drain pipe 60. A clamping section 10 for clamping a filter, which will be described later, is provided on one longitudinal end side (lower side in FIG. 2 and FIG. 3) of the elongated members 3a and 3b. A gripping section 20 formed so as to be grippable is provided on the other longitudinal end side (upper side in FIG. 2 and FIG. 3) of the elongated members 3a and 3b. Furthermore, the elongated members 3a and 3b are connected to each other at a connection section 30 between the clamping section 10 and the gripping section 20, crossing each other so that the elongated members 3a and 3b overlap each other.

[0043] Next, the clamping portion 10, the gripping portion 20 and the connecting portion 30 will each be described in detail.

[0044] The clamping part 10 has hooks 11a and 11b, the tips of which face inward, on which a filter, described later, can be hooked. The clamping part 10 is provided with movement prevention parts 12a and 12b, which are formed in a mountain shape protruding inward on the connection part 30 side from the hooks 11a and 11b, and which prevent the filter, described later, from unintentionally moving toward the connection part 30 side. The clamping part 10 is further provided with removal parts 15a and 15b, which can remove the filler, described later. The removal parts 15a and 15b are formed in the shape of a cylindrical cap made of resin, and can be attached so as to cover the hooks 11a and 11b and the movement prevention parts 12a and 12b, and are configured to be freely detachable. The clamping part 10 side of the elongated member 3b is provided with an illumination part 17, which is a small light that can be freely detached. The effects of configuring the clamping unit 10, the removing units 15a and 15b, and the irradiating unit 17 of the repair tool 1 in this manner will be described later.

[0045] The grip portion 20 has ring-shaped openings 21a, 21b formed in each of the pair of elongated members 3a, 3b. This allows fingers to pass through the inside of the openings 21a, 21b, improving operability.

[0046] FIG. 4 is a schematic diagram showing a state in which a pair of elongated members of the repair tool shown in FIG. 2 are moved relative to each other in the longitudinal direction, and FIG. 5 is a schematic diagram showing a state in which the repair tool shown in FIG. 2 is in an open state.

[0047] 4 and 5, the connection part 30 supports and connects the long members 3a and 3b to each other so that they can be opened and closed. Specifically, the long members 3a and 3b are connected to each other so as to overlap each other at the connection part 30 as described above, and when the gripping parts 20 are moved in the opening direction, which is a direction in which they move away from each other, the clamping parts 10 also move in the opening direction, which is a direction in which they move away from each other, and the long members 3a and 3b are in an open state. On the other hand, when the gripping parts 20 are moved in the closing direction, which is a direction in which they approach each other, the clamping parts 10 also move in the closing direction, which is a direction in which they approach each other. When the movement of the gripping parts 20 and the clamping parts 10 in the closing direction is completed, the long members 3a and 3b are in a closed state as shown in FIG. 2 and FIG. 3.

[0048] Moreover, one of the long members 3a is provided with a long hole 31, and the other long member 3b is provided with a circular hole (not shown) at a position overlapping the vicinity of a first position 32, which is the end of the long hole 31 of the long member 3a on the side of the clamping portion 10. Then, the long members 3a and 3b are fastened together by a fastener 35 that passes through the long hole 31 of the long member 3a and the circular hole of the long member 3b in a state where they are overlapped. The fastener 35 is composed of a bolt 36 and a nut 37, and the bolt 36 passes through the long hole 31 and the circular hole of the long member 3b from the front side (surface side) of the long member 3a, and the nut 37 is fitted into the bolt 36 from the back side (rear side) of the long member 3b. Because the shaft of the bolt 36 passes through the long hole 31, when the nut 37 is loosened, the bolt 36 is movable inside the long hole 31 between a first position 32 of the long hole 31 and a second position 33 which is the end of the long hole 31 on the side of the gripping part 20, as shown in Figures 2 and 4. In addition, by tightening the nut 37, the connection part 30 can be fixed at any position between the first position 32 and the second position 33, and the entire long members 3a, 3b can be fixed.

[0049] The fasteners 35 fix the longitudinal positional relationship of the elongated members 3a, 3b, but do not hinder the opening and closing of the elongated members 3a, 3b. However, the fasteners 35 may be configured to fix the open and closed states by tightening the fasteners more firmly.

[0050] The relative movement of the elongated members 3a, 3b in the longitudinal direction is possible not only when the elongated members 3a, 3b are in a closed state, but also when they are in an open state. As a result, the elongated members 3a, 3b can move relatively to each other in the longitudinal direction while holding a filter, which will be described later in detail.

[0051] The effect of configuring the connection portion 30 in this way will be described later.

[0052] Next, a description will be given of a method for repairing the retaining wall 50. In this case, the above-mentioned repair tool 1 is used.

[0053] Figure 6 is a diagram showing a method of repairing a retaining wall according to the first embodiment of the present invention, in which (1) is a schematic diagram showing the filler injection process for injecting filler into the inside of the retaining wall and the confirmation process for confirming the condition of the observation area, and (2) is a schematic diagram showing the condition of the observation area observed from the front side of the drainage pipe.

[0054] First, referring to Fig. 6 (1), a hose 72 for injecting a filler 70 made of mortar or the like into the gaps 55 existing between the piled stones 51 of the retaining wall 50 is inserted from the front side of the retaining wall 50 toward the back side. Then, once it is confirmed that the hose 72 has reached the filler stones 52, the filler 70 is pumped toward the inside of the retaining wall 50 and is injected so as to fill in particular the filler stones 52 and the gaps 55. In this manner, the filler injection process is completed.

[0055] Next, referring to FIG. 6(2) in addition to FIG. 6(1), a confirmation step is performed to confirm through the drain pipe 60 that the injected filler 70 has not penetrated into the observation area 57 located at the rear side of the drain pipe 60 in the longitudinal direction. Specifically, as shown by the arrow in FIG. 6(1), the observation area 57 is observed by looking from the front side of the drain pipe 60 to the rear side (observation step). Then, as shown in FIG. 6(2), it can be confirmed that the filler 70 has penetrated into the upper left side of the observation area 57. This completes the confirmation step, which is an observation step. Note that, to confirm the observation area 57, the irradiation part 17 of the repair tool 1 shown in FIG. 2 may be inserted from the front side of the drain pipe 60 toward the rear side to irradiate the observation area 57 as necessary. In this way, the state of the observation area 57 can be confirmed more clearly, and the confirmation step can be easily performed.

[0056] If the filler 70 hardens while remaining in the observation area 57, the flow of water from the backfill stones 53 to the drainage pipe 60 will be blocked, which will lead to impeding drainage from the drainage pipe 60. For this reason, it is necessary to keep the observation area 57 free of filler 70.

[0057] FIG. 7 is a diagram showing a method for repairing a retaining wall according to the first embodiment of the present invention, and is a schematic diagram showing a treatment process for preventing filling material that has invaded the observation area from being present in the observation area.

[0058] With reference to FIG. 7, if the filler 70 has infiltrated into the observation area 57 in the confirmation step, a treatment step is performed to prevent the infiltrated filler 70 from being present in the observation area 57. This treatment step includes a filler removal step of removing the filler 70 that has infiltrated into the observation area 57 through the water drainage pipe 60. Specifically, first, the repair tool 1 with the removal parts 15a and 15b attached to the clamping part 10 is inserted from the front side to the back side of the water drainage pipe 60. Next, the removal parts 15a and 15b are applied to the filler 70 present in the observation area 57, and the filler 70 is entangled while, for example, rotating the repair tool 1 around its longitudinal axis. Thereafter, the repair tool 1 is pulled out to the front side of the water drainage pipe 60, completing the treatment step of removing the filler.

[0059] In this way, the filler 70 can be easily removed from the back side of the drainage pipe 60, which makes it easy to ensure the drainage of the retaining wall 50. In addition, by using the repair tool 1, the treatment process can be performed using the removal parts 15a and 15b, which makes it easy to perform the treatment process.

[0060] In the first embodiment, the elongated members 3a, 3b of the repair tool 1 are slightly opened to remove the filler 70, but the clamping unit 10 may remain closed. If the irradiation unit 17 is used to irradiate the observation area 57 during the work, the position of the filler 70 can be easily confirmed, which results in a more efficient method of repairing the retaining wall 50.

[0061] Figure 8 is a diagram showing a retaining wall repair method according to the first embodiment of the present invention, where (1) is a schematic diagram showing the condition of the observation area after the treatment process has been carried out, and (2) is a schematic diagram showing the condition of the observation area observed from the front side of the drainage pipe.

[0062] Referring to Fig. 8 (1), after the treatment step is performed, the confirmation step is performed again. Specifically, in the observation step, the condition of the observation area 57 is checked by looking from the front side of the water drainage pipe 60 as shown by the arrow. Then, as shown in Fig. 8 (2), it can be confirmed that the filler 70 is not present in the observation area 57 and that the filler 70 has been removed from the observation area 57.

[0063] If it is confirmed in the confirmation step that the filler 70 remains in the observation region 57, the treatment step, which is the filler removal step, is repeated until the filler 70 is removed.

[0064] Furthermore, although not shown, the above-mentioned treatment step may be a pipe relocation step of relocating the water drainage pipe 60 to a position where there is no filler 70 that has invaded the observation area 57. At the location where the water drainage pipe 60 has been relocated, the confirmation step is carried out again, and if it is confirmed again that the filler 70 has invaded the observation area 57, the pipe relocation step and confirmation step are repeated.

[0065] By carrying out such a treatment process, no filler 70 is present in the observation area 57, so that the drainage properties of the retaining wall 50 can be more reliably ensured.

[0066] Next, a filter attachment process for attaching a water drainage filter to the water drainage pipe 60 that has been subjected to the treatment process will be described. Here, a method using the repair tool 1 will be described.

[0067] FIG. 9 is a schematic diagram of the filter according to the first embodiment of the present invention, where (1) is a schematic perspective view and (2) is a schematic bottom view.

[0068] 9, filter 40 has a circular filter body 48 made of nonwoven fabric attached inside a resin frame 41 having a circular dish shape and a flexible flange portion 42 on its periphery. A large number of small holes 44 are formed in the dish bottom portion 43 of frame 41 of filter 40.

[0069] Referring also to Figure 1, such a filter 40 is attached to the rear end of the drain pipe 60 (the side that contacts the backfill stones 53) and serves to drain only the water that can pass through the filter body 48 and small holes 44 from the drain pipe 60 while blocking the backfill stones 53 and soil 54.

[0070] The diameter of the flange portion 42 of the frame 41 of the filter 40 is formed to be slightly larger than the inner diameter of the drainage pipe 60 shown in Fig. 1. As a result, when the filter 40 is fitted into the drainage pipe 60, the flange portion 42 covers the outer surface of the rear end of the drainage pipe 60, reducing the risk of the filter 40 falling over to the front side of the drainage pipe 60.

[0071] Figure 10 is a diagram showing a filter installation process of a retaining wall repair method according to the first embodiment of the present invention, where (1) is a schematic diagram showing a clamping process in which the filter is clamped by a repair tool, and (2) is a schematic diagram showing an attitude adjustment process in which the attitude of the clamped filter is adjusted so that it is inclined relative to the longitudinal direction of the drain pipe.

[0072] Referring to FIG. 10(1) and again to FIG. 2 and FIG. 9, first, the removal parts 15a, 15b and the irradiation part 17 of the repair tool 1 are removed. Next, the gripping part 20 of the repair tool 1 is operated in the opening direction to slightly open the elongated members 3a, 3b. Next, the hooking part 11a of the clamping part 10 is hooked on any one of the small holes 44 of the filter 40, and similarly, the hooking part 11b is hooked on any other one of the small holes 44. Furthermore, the gripping part 20 is operated in the closing direction to move the elongated members 3a, 3b in the closing direction to sandwich the filter 40, thereby completing the clamping process of the filter 40.

[0073] In this way, by hooking the hook portions 11a, 11b of the clamping portion 10 onto the small holes 44 of the filter 40, the filter 40 can be hooked and clamped, making it possible to stably attach the filter 40 to the water drain pipe 60.

[0074] As described above, the repair tool 1 has the hooking parts 11a and 11b on the clamping part 10, which makes it possible to clamp the filter 40 while hooking it, thereby enabling the filter 40 to be securely clamped. Furthermore, since the hooking parts 11a and 11b are shaped like hooks, the hooked filter 40 is less likely to come off, and the hooked state of the filter 40 is stable.

[0075] Furthermore, as explained in Figures 2 and 3, the repair tool 1 is provided with movement preventing portions 12a, 12b on the clamping portion 10, so that the insertion of the clamping portion 10 into the inside of the filter 40 is prevented by the movement preventing portions 12a, 12b, and it is possible to prevent the filter body 48 from falling off from the frame body 41 of the filter 40 shown in Figure 4 due to excessive insertion of the hook portions 11a, 11b.

[0076] In this state, when the flange portion 42 of the filter 40 is aligned with the front end 61 of the drain pipe 60, as described above, the diameter of the flange portion 42 of the frame body 41 of the filter 40 is formed to be slightly larger than the inner diameter of the drain pipe 60, so that the height direction length L1 of the diameter of the flange portion 42 is longer than the height direction length L2 of the inner diameter of the drain pipe 60.

[0077] Next, referring to FIG. 10(2) and referring again to FIG. 4, while the filter 40 is being clamped, the fastener 35 of the connection part 30 of the repair tool 1 is moved from the first position 32 of the long hole 31 of the long member 3a to the second position 33, thereby moving the long members 3a and 3b relatively in the longitudinal direction. Then, the position of the filter 40 is inclined at a predetermined angle with respect to the longitudinal direction of the water drain pipe 60. The inclination angle is not particularly limited, but it is preferable that the filter 40 is inclined at about 30° (about 60° with respect to the longitudinal direction of the water drain pipe 60) from the state where the filter 40 is aligned with the water drain pipe 60. By adjusting the position of the filter 40 in this manner, the position adjustment process is completed.

[0078] When this filter 40 is tilted, the length L3 in the height direction from the upper end 46a to the lower end 46b of the flange portion 42 of the frame body 41 of the filter 40 (in Figure 10, a direction perpendicular to the insertion direction of the filter 40) is shorter than the length L2 in the height direction of the inner diameter of the water drain pipe 60.

[0079] In this posture adjustment process, as described above, the repair tool 1 has a long hole 31 provided in the elongated member 3a, and the long members 3a, 3b are overlapped and fastened with fasteners 35, so that one elongated member 3b can be moved longitudinally relative to the other elongated member 3a by the length of the long hole 31, making it easy to adjust the posture of the filter 40.

[0080] Next, when the fasteners 35 are fastened to fix the connection portion 30, the entire elongated members 3a, 3b are fixed, and the attitude of the filter 40 adjusted in the attitude adjustment step is also fixed. This completes the step of fixing the attitude of the filter 40.

[0081] By fixing the connection part 30 in this manner through the posture fixing process, the filter 40 can be inserted into the drain pipe 60 while maintaining a constant posture, as described below, making it easier to attach the filter 40 to the drain pipe 60.

[0082] Figure 11 is a diagram showing the filter installation process of the retaining wall repair method according to the first embodiment of the present invention, where (1) is a schematic diagram showing the intermediate state of the insertion process in which the filter whose posture has been adjusted in Figure 10 is inserted into the drain pipe, and (2) is a schematic diagram showing the fitting process in which the inserted filter is fitted into the drain pipe and then the filter is released from its clamped state by the repair tool.

[0083] Referring to FIG. 11 (1), the repair tool 1 with the connection part 30 fixed is inserted from the front side to the back side of the drain pipe 60, and the filter 40 with its posture adjusted is inserted from the front side to the back side of the drain pipe 60. At this time, as described above, the diameter of the flange part 42 of the filter 40 is slightly larger than the inner diameter of the drain pipe 60, so that in the depth direction of the filter 40 (the direction penetrating the paper surface of FIG. 11), the depth direction ends 47a, 47b, which are part of the flange part 42, are pressed against the inner surface of the drain pipe 60. On the other hand, the length L3 in the height direction from the upper end 46a to the lower end 46b of the flange part 42 of the filter 40 is shorter than the length L2 of the inner diameter in the height direction of the drain pipe 60, so that the flange part 42 of the filter 40 is separated from the inner surface of the drain pipe 60 in the height direction. Therefore, the resistance of the filter 40 to the drain pipe 60 when it is inserted can be reduced.

[0084] The insertion process is completed when the filter 40 is inserted beyond the rear end 62 of the drain pipe 60. Note that, with regard to the backfill stone (not shown) located on the rear side of the rear end 62 of the drain pipe 60, the action of inserting the filter 40 can be used to push the backfill stone out of the way to allow the filter 40 to be attached.

[0085] In such an insertion step, as described above, the repair tool 1 has the movement preventing portions 12a, 12b in the clamping portion 10, which prevents the filter 40 from moving toward the connection portion 30, thereby stably clamping the filter 40. Furthermore, since the movement preventing portions 12a, 12b have a mountain-like shape protruding inwardly from each other, the filter 40 is reliably prevented from moving toward the connection portion 30, and the clamping state of the filter 40 becomes more stable.

[0086] Next, referring to FIG. 11(2) and referring again to FIG. 2, after the filter 40 passes the rear end 62 of the drain pipe 60, the fastener 35 of the connection part 30 of the repair tool 1 is loosened to release the fixed state of the long members 3a and 3b. Then, the fastener 35 is moved from the second position 33 of the long hole 31 of the long member 3a to the first position 32, and the long members 3a and 3b are moved relatively. Then, the position of the filter 40 changes again accordingly, and the flange part 42 of the frame body 41 of the filter 40 is aligned with the rear end 62 of the drain pipe 60. In other words, the filter 40 is in a position to abut against the rear end 62 of the drain pipe 60. In this state, the repair tool 1 is pulled out to the front side of the drain pipe 60, and the filter 40 is fitted so that the flange part 42 of the filter 40 abuts against the rear end 62 of the drain pipe 60. Thereafter, the hooks 11a, 11b of the clamping portion 10 of the repair tool 1 are pulled out of the small holes 44 of the filter 40 to release the clamped state, thereby completing the fitting process of the filter 40.

[0087] Finally, the repair tool 1 is pulled out in the direction toward the front of the drainage pipe 60 as indicated by the arrow, thereby completing the filter attachment process and repair of the retaining wall 50.

[0088] In the method for repairing the retaining wall 50, which includes the treatment step and the filter attachment step described above, the filter 40 is attached in a state in which the filler 70 is not present in the observation area 57, so that the filler 70 does not flow into the back side of the drainage pipe 60 or the filter 40. This allows water to flow unimpeded from the drainage pipe 60 after the retaining wall 50 has been repaired, resulting in an efficient repair method while ensuring good drainage.

[0089] Furthermore, in the method of repairing a retaining wall 50 using the repair tool 1 as described above, the height length L3 from the upper end 46a to the lower end 46b of the flange portion 42 of the filter 40 after adjusting its posture is shorter than the height length L2 of the inner diameter of the drain pipe 60, and resistance when inserting the filter 40 is reduced, making it easier to attach the filter 40 to the drain pipe 60.As a result, the filter attachment process can be carried out quickly, resulting in a more efficient method of repairing a retaining wall 50.

[0090] In addition, as described above, the repair tool 1 is configured so that the elongated members 3a, 3b can be moved relative to each other in the longitudinal direction while the filter 40 is clamped. This makes it easy to adjust the position of the filter 40 while it is being clamped, facilitating the filter installation process.

[0091] Furthermore, since the fasteners 35 of the repair tool 1 are capable of moving freely between the first position 32 and the second position 33 of the long hole 31 and can be fixed between the first position 32 and the second position 33 by the fasteners 35, it becomes possible to freely move and fix one elongated member 3b relative to the other elongated member 3a between the first position 32 and the second position 33 of the long hole 31, making it even easier to adjust the posture of the filter 40.

[0092] Furthermore, by attaching the filter 40 to the drainage pipe 60 that does not have a drainage filter attached in advance, it is possible to prevent the outflow of the retaining stones 52, the backfill stones 53, and the soil 54. This makes it possible to prevent the formation of gaps on the back side of the drainage pipe 60, which reduces the risk of the retaining wall 50 collapsing, and improves disaster prevention capabilities.

[0093] In addition, in the above first embodiment, the method of repairing the retaining wall 50 uses a repair tool 1, but if the filter 40 can be retrofitted to the drain pipe 60 without using the repair tool 1, the present invention will be achieved.

[0094] Next, a method for repairing the retaining wall 50 will be described in the case where an existing filter is attached to the drainage pipe 60 arranged in the retaining wall 50. In this case, the method for repairing the retaining wall 50 further includes an existing filter removal step of removing the existing filter prior to the filling material injection step.

[0095] Figure 12 is a diagram showing the existing filter removal process of the retaining wall repair method according to the second embodiment of the present invention, where (1) is a schematic diagram showing the first clamping process of clamping the filter with a repair tool, and (2) is a schematic diagram showing the first attitude adjustment process and the first attitude fixing process of adjusting the attitude of the clamped filter so that it is inclined relative to the longitudinal direction of the drain pipe.

[0096] The structures of the retaining wall 50, drainage pipe 60 and repair tool 1 in this second embodiment are similar to those in the first embodiment, and the structure of the existing filter 80 is similar to that of the filter 40 in the first embodiment, so the differences will be mainly described here.

[0097] Referring to Fig. 12(1) and again to Fig. 9, first, the gripping portion 20 of the repair tool 1 is operated in the opening direction to bring the elongated members 3a, 3b into a slightly open state. Next, the repair tool 1 is inserted into the water drainage pipe 60, and the hooking portion 11a of the clamping portion 10 is hooked onto any one of the small holes 84 of the existing filter 80, and similarly, the hooking portion 11b is hooked onto any other one of the small holes 84. Next, the gripping portion 20 is operated in the closing direction to move the elongated members 3a, 3b into the closing direction to sandwich the existing filter 80, thereby completing the first clamping step.

[0098] Next, referring to FIG. 12(2) and FIG. 4 again, the fastener 35 of the connection part 30 of the repair tool 1 is moved from the first position 32 of the long hole 31 of the long member 3a to the second position 33 while the existing filter 80 is clamped, and the long members 3a and 3b are moved relatively in the longitudinal direction. Then, the posture of the existing filter 80 is inclined at a predetermined angle with respect to the longitudinal direction of the drain pipe 60 while pushing aside the backfill stone (not shown). Note that this inclination angle is not particularly limited, but it is preferable to incline the existing filter 80 by about 30° (about 60° with respect to the longitudinal direction of the drain pipe 60) from the state where the existing filter 80 is aligned with the inner end 62 of the drain pipe 60. By adjusting the posture of the existing filter 80 in this manner, the first posture adjustment process is completed.

[0099] Next, when the fasteners 35 are fastened to fix the connection portion 30, the entire elongated members 3a, 3b are also fixed. This fixes the posture of the existing filter 80 adjusted in the first posture adjustment step, and completes the first posture fixing step.

[0100] When the existing filter 80 is tilted, the length L4 in the height direction from the upper end 86a to the lower end 86b of the flange portion 82 of the frame body 81 of the existing filter 80 (in Figure 13, the direction perpendicular to the direction in which the existing filter 80 is pulled out) is shorter than the length L2 in the height direction of the inner diameter of the water drain pipe 60.

[0101] Figure 13 is a diagram showing the existing filter removal process of the retaining wall repair method according to the second embodiment of the present invention, where (1) is a schematic diagram showing the intermediate state of the extraction process in which the filter whose posture has been adjusted in Figure 12 is pulled out from the drain pipe, and (2) is a schematic diagram showing the completed state of the extraction process in which the filter has been completely pulled out from the drain pipe.

[0102] Referring to FIG. 13(1), the repair tool 1 with the connection part 30 fixed thereto is pulled out from the back side of the drain pipe 60 toward the front side, and the existing filter 80 with its posture adjusted is pulled out from the back side of the drain pipe 60 toward the front side. At this time, since the existing filter 80 has a structure similar to that of the filter 40 of the first embodiment, the diameter of the flange part 82 of the existing filter 80 is slightly larger than the inner diameter of the drain pipe 60. Therefore, in the depth direction of the existing filter 80 (the direction penetrating the paper surface of FIG. 13), the depth direction ends 87a, 87b, which are part of the flange part 82, are pressed against the inner surface of the drain pipe 60. On the other hand, the length L4 in the height direction from the upper end 86a to the lower end 86b of the flange part 82 of the existing filter 80 is shorter than the length L2 of the inner diameter in the height direction of the drain pipe 60, so that the flange part 82 of the existing filter 80 is separated from the inner surface of the drain pipe 60 in the height direction. Therefore, the resistance to the drain pipe 60 when the existing filter 80 is pulled out can be reduced.

[0103] 13(2), the removal process is completed when the existing filter 80 has been removed beyond the front end 61 of the drain pipe 60. Thereafter, the removed existing filter 80 is removed from the repair tool 1.

[0104] This completes the existing filter removal process.

[0105] In this existing filter removal process, the first attitude fixing process allows the existing filter 80 to be pulled out from the water drain pipe 60 while maintaining a constant attitude, making it easy to remove the existing filter 80 from the water drain pipe 60.

[0106] Next, referring again to Figures 6 to 8, the removal units 15a, 15b and the irradiation unit 17 are attached to the repair tool 1, and the filler injection process, confirmation process and treatment process described in the first embodiment above are performed on the retaining wall 50.

[0107] At this time, by performing the above-mentioned process of removing the existing filter, it becomes easier to check the observation area 57 at the back of the drainage pipe 60, and the inspection process can be carried out quickly, resulting in a more efficient method of repairing the retaining wall 50.

[0108] After it is confirmed in the confirmation step that the filler 70 is not present in the observation area 57 as shown in FIG. 8, a filter attachment step is performed to attach a new filter.

[0109] Referring again to Figure 10 (1), the filter installation step in the method for repairing a retaining wall 50 in the second embodiment includes a second clamping step in which a new filter 90, which is different from the existing filter 80, is clamped by the repair tool 1. The new filter 90 has a structure similar to that of the filter 40 in the first embodiment. This second clamping step corresponds to the clamping step in the filter installation method in the first embodiment, and the new filter 90 is clamped by the repair tool 1 in the same manner as the procedure described in the first embodiment.

[0110] 10(2), a second attitude adjustment step is performed, which corresponds to the attitude adjustment step of the filter attachment method in the first embodiment. Specifically, in the same manner as in the procedure described in the first embodiment, the attitude of the new filter 90 is adjusted by relatively moving the elongated members 3a and 3b of the repair tool 1 in the longitudinal direction while the new filter 90 is held.

[0111] Next, a second attitude fixing step is performed, which corresponds to the attitude fixing step of the filter attachment method in the first embodiment. Specifically, the attitude of the new filter 90 is fixed by fixing the connection part 30 of the repair tool 1 in the same manner as described in the first embodiment.

[0112] When this new filter 90 is tilted, as in the first embodiment, the height length L3 from the upper end 96a to the lower end 96b of the flange portion 92 of the frame body 91 of the new filter 90 is shorter than the height length L2 of the inner diameter of the water drain pipe 60.

[0113] 11(1), an insertion step is performed that corresponds to the insertion step of the filter attachment method in the first embodiment. Specifically, in the same manner as in the procedure described in the first embodiment, the new filter 90 whose position has been adjusted is inserted from the front side to the rear side of the water drain pipe 60 until the new filter 90 exceeds the rear end 62 of the water drain pipe 60.

[0114] At this time, as in the first embodiment, the diameter of the flange portion 92 of the frame body 91 of the new filter 90 is slightly larger than the inner diameter of the drain pipe 60, so that in the depth direction of the new filter 90 (the direction penetrating the paper surface of FIG. 10), the depth direction ends 97a, 97b, which are part of the flange portion 92, are pressed against the inner surface of the drain pipe 60. Meanwhile, the length L3 in the height direction from the upper end 96a to the lower end 96b of the flange portion 92 of the new filter 90 is shorter than the length L2 of the inner diameter in the height direction of the drain pipe 60, so that the flange portion 92 of the new filter 90 is separated from the inner surface of the drain pipe 60 in the height direction. Therefore, the resistance to the drain pipe 60 when the new filter 90 is inserted can be reduced.

[0115] 11(2), an installation step corresponding to the installation step of the filter attachment method in the first embodiment is carried out. Specifically, in the same manner as in the procedure described in the first embodiment, the long members 3a, 3b of the repair tool 1 are moved relatively to adjust the position of the new filter 90 to a position in which the new filter 90 abuts against the rear end 62 of the water drain pipe 60, and then the new filter 90 is fitted so that the flange portion 92 of the new filter 90 abuts against the rear end 62 of the water drain pipe 60.

[0116] In this manner, the filter installation process for the new filter 90 is completed, and the repair of the retaining wall 50 is completed.

[0117] In the method of repairing the retaining wall 50, which comprises the filter removal process and filter installation process as described above, the height lengths L3, L4 from the upper ends 86a, 96a to the lower ends 86b, 96b of the flange portions 82, 92 of the existing filter 80 and the new filter 90, whose posture has been adjusted, are shorter than the height length L2 of the inner diameter of the drain pipe, and resistance when pulling out the existing filter 80 and inserting the new filter 90 is reduced, making it easier to replace the filter in the drain pipe 60.As a result, the existing filter removal process and filter installation process can be carried out quickly, resulting in a more efficient method of repairing the retaining wall 50.

[0118] Incidentally, in the above-mentioned second embodiment, the method of repairing the retaining wall 50 uses a repair tool 1, but if it is possible to pull out the existing filter 80 from the drain pipe 60 and retrofit a new filter 90 to the drain pipe 60 without using the repair tool 1, then the present invention will be achieved.

[0119] In addition, in the above first and second embodiments, the explanation is based on the premise that the drainage pipe 60 is installed in the retaining wall 50 beforehand, but some retaining walls do not have a drainage pipe installed. In such cases, a pipe installation process is performed in which the drainage pipe is installed in the retaining wall before the filling material injection process is performed. In this way, the confirmation process can be performed quickly, resulting in a more efficient method of repairing the retaining wall 50.

[0120] In the above-described embodiments, the retaining wall is a dry-stone masonry retaining wall, but the present invention is not limited to this and may be other types of retaining walls, such as a mortared concrete block retaining wall.

[0121] In addition, in each of the above-described embodiments, the retaining wall may be an existing one or a newly constructed one.

[0122] Furthermore, in each of the above embodiments, the retaining wall has backfill stones provided behind the drainage pipe as a permeable layer, but the present invention also applies to retaining walls that are directly filled with soil and sand.

[0123] Furthermore, in each of the above embodiments, gaps exist between the piled stones, but if there are no gaps, holes for injecting the filler material can be formed in the retaining wall in advance, and a hose can be inserted into the holes to inject the filler material.

[0124] Furthermore, in each of the above embodiments, the checking step is carried out after the filling material injection step, but the filling material injection step and the checking step may be carried out in parallel by injecting the filling material while checking the condition of the observation area from the water drainage pipe. In this way, a more rapid response is possible.

[0125] Furthermore, in each of the above embodiments, the treatment process was carried out because it was confirmed in the confirmation process that the filler had entered the observation area, but if the filler has not entered the observation area in the confirmation process, the treatment process may be carried out without carrying out the filter attachment process.

[0126] Furthermore, in each of the above embodiments, the checking step is an observation step in which the checking is performed visually, but it may be performed by other means such as a small camera, a sensor, or the like.

[0127] Furthermore, in the first embodiment, the clamping step is performed before the attitude adjusting step, but this is not limited to this. The filter may be clamped in the clamping step after the elongated members of the repair tool are moved relatively to each other in the attitude adjusting step.

[0128] Furthermore, in the second embodiment described above, the second clamping step is performed before the second attitude adjustment step, but this is not limited to this. The filter may be clamped in the second clamping step after the elongated members of the repair tool are moved relatively to each other in the second attitude adjustment step.

[0129] Furthermore, although the first embodiment described above includes the attitude fixing step, the attitude fixing step may be omitted. In that case, the repair tool may be operated so as to maintain the attitude of the filter adjusted in the attitude adjustment step.

[0130] Furthermore, in the above first embodiment, the first attitude fixing step and the second attitude fixing step are included, but the first attitude fixing step and the second attitude fixing step may be omitted. In that case, it is sufficient to operate the repair tool so as to maintain the attitude of the filter adjusted by the first attitude adjustment step and the second attitude adjustment step.

[0131] Furthermore, in each of the above-described embodiments, the checking step, the treatment step, and the filter installation method each use a specific repair tool, but the repair tool may not be used. Also, the repair may be performed by means other than the repair tool.

[0132] Furthermore, in the second embodiment, each of the existing filter removal methods uses a repair tool, but the repair tool does not have to be used. Also, the existing filter removal method may use a means other than the repair tool.

[0133] Furthermore, in each of the above embodiments, the repair tool is formed by punching a steel plate, but the material and manufacturing method are not limited to this. It may be made of wood or resin, or may be formed by casting.

[0134] In the above embodiments, the length of the repair tool is not limited, and may be long enough for the user to push the gripping part into the back end of the drain pipe with their arm. For ease of operation, it is preferable that the repair tool is longer than the drain pipe on which the filter is to be attached or replaced, and more preferably that the gripping part is long enough to extend outside the drain pipe.

[0135] Furthermore, in each of the above embodiments, the clamping portion has a specific shape, but is not limited to this, and may have other shapes, such as a non-slip surface with projections and recesses.

[0136] Furthermore, in each of the above-described embodiments, the clamping portion has a hook portion, but the hook portion may be omitted.

[0137] Furthermore, in each of the above embodiments, the hook portion has a hook shape, but this is not limited to this, and may have other shapes such as a T-shape.

[0138] Furthermore, in each of the above-described embodiments, the clamping portion has a movement preventing portion, but the movement preventing portion may be omitted.

[0139] Furthermore, in each of the above-described embodiments, the movement prevention parts have a mountain-like shape facing inward, but this is not limited to this. They may face in other directions or have other shapes, such as facing outward or being formed in a kamaboko shape.

[0140] Furthermore, in each of the above embodiments, the clamping portion has a removing portion, but the removing portion may be omitted.

[0141] Furthermore, in each of the above embodiments, the removal portion is formed in the shape of a cylindrical resin cap, but it may be spoon-shaped, spirally shaped, or of any other shape that makes it easy to remove the filler.

[0142] Furthermore, in each of the above-described embodiments, an irradiation section is provided on the clamping section side of the elongated member, but the irradiation section does not have to be provided.

[0143] Furthermore, in each of the above embodiments, the irradiating unit is a small light, but other means may be used.

[0144] Furthermore, in each of the above embodiments, the grip portion has a specific shape, but is not limited to this. It may have another shape, such as a thick rod shape without an opening and a grip wrapped around it to make it easier to hold.

[0145] Furthermore, in each of the above embodiments, the connecting portion has a specific shape, but is not limited thereto. Any other configuration may be used as long as the long members are pivotally supported so as to be freely opened and closed, and the long members are relatively movable in the longitudinal direction while the filter is sandwiched between them. For example, one of the pair of long members may be provided with a first long hole, and the other of the pair of long members may be provided with a second long hole having a shape similar to that of the first long hole at a position overlapping the first long hole, and the long members may be fastened by a fastener penetrating the first long hole and the second long hole in a state where the long members are overlapped. In this way, the one long member and the other long member can be relatively moved in the longitudinal direction by the length of the first long hole and the second long hole, making it easy to fine-tune the attitude of the filter.

[0146] Furthermore, in each of the above embodiments, the fastening portion is configured by a bolt and a nut, but is not limited to this and may be other fastening portions.

[0147] Furthermore, in each of the above embodiments, the filter has a specific structure, but is not limited to this. As long as it is attached to the drain pipe, it may have a conical shape, a filter with legs to prevent the filter from falling off inside the drain pipe, or a filter with a lid with holes that covers the filter body on the frame to prevent the filter body from falling off, or other shapes may be used.

[0148] Furthermore, in each of the above-described embodiments, the filter has a configuration in which the filter body is attached inside the frame, but this is not limited to this. The filter may have a configuration in which the filter body is not provided by forming small holes in the filter frame and providing the same function as the filter body.

[0149] Furthermore, in each of the above embodiments, the flange portion of the filter is flexible, but this is not limited to this. It may be a non-flexible one as long as it can be inserted into the drain pipe by reducing its diameter, etc.

[0150] Furthermore, in each of the above-described embodiments, the material of the frame of the filter is not particularly limited, and any material may be used as long as it does not deteriorate in the soil.

[0151] Furthermore, in each of the above embodiments, the filter body is made of nonwoven fabric, but this is not limiting, and it may be made of resin such as a frame having a plurality of holes.

[0152] Furthermore, in each of the above embodiments, the filter has a specific shape, but this is not limited thereto, and the shape of the filter may be changed when the filter is inserted into or removed from the water drain pipe. [Explanation of symbols]

[0153] 1... Repair tools 3a, 3b...Long members 10...Holding part 15a, 15b...removal part 17…Irradiation unit 20...Gripping part 30…Connection 40…Filter 41, 81, 91...frame body 42, 82, 92...Flange section 48…Filter body 50…Retaining wall 55...Gap 57…Observation area 60…Drain pipe 61...Front end of drain pipe 62…Back end of drain pipe 70…Filling material 80…Existing filter 90…New filter In addition, the same symbols in each drawing indicate the same or corresponding parts.

Claims

1. A method for repairing a retaining wall, comprising the steps of: a filler injection process for injecting a filler into the inside of the retaining wall through gaps present in the retaining wall or holes formed in the retaining wall; A confirmation step of confirming through the water drainage pipe that the filler has not penetrated into an observation area located on the rear side of the water drainage pipe arranged in the retaining wall in the longitudinal direction; a treatment step of, when the filler has entered the observation area in the confirmation step, performing a treatment so that the entered filler does not exist in the observation area; A method for repairing a retaining wall, comprising a filter attachment process for attaching a filter to the rear longitudinal side of the drainage pipe after the confirmation process or the treatment process.

2. The method for repairing a retaining wall according to claim 1 , wherein the treatment step includes removing the filler that has invaded the observation area through the drainage pipe.

3. The method for repairing a retaining wall according to claim 1 , wherein the treatment step includes moving the drainage pipe to a position where the invaded filler material is not present in the observation area.

4. The method for repairing a retaining wall according to claim 1 , further comprising a pipe installation step of installing the drainage pipe prior to the filler injection step if the drainage pipe is not installed in the retaining wall.

5. The method for repairing a retaining wall as described in claim 1, further comprising an existing filter removal step of removing the existing filter prior to the filler injection step if an existing filter is attached to a drainage pipe arranged in the retaining wall.

6. A repair tool comprising a pair of long members for use in the retaining wall repair method according to claim 1, a clamping portion provided at one end of the pair of elongated members in the longitudinal direction and capable of clamping the filter; A gripping portion provided on the other end side of the pair of elongated members in the longitudinal direction and formed to be grippable; a connecting portion between the clamping portion and the gripping portion, the connecting portion pivotally supporting and connecting the elongated members so that the elongated members can be opened and closed relative to each other, A repair tool configured so that the elongated members are relatively movable in the longitudinal direction while holding the filter.

7. The repair tool according to claim 6 , wherein the clamping portion further comprises a removal portion capable of removing the filling material.

8. The repair tool according to claim 6 , further comprising an illumination unit provided on the clamping unit side for illuminating the observation area.

9. A method for repairing a retaining wall using the repair tool according to claim 6, comprising the steps of: The water drain pipe is cylindrical, and the filter is a dish-shaped frame having a flexible flange portion at its periphery, and a filter body is attached to the frame. The filter attachment step includes: a clamping step of clamping the frame of the filter with the repair tool; an attitude adjustment step of adjusting the attitude of the filter so that it is inclined with respect to the longitudinal direction of the water drain pipe by relatively moving the elongated members of the repair tool in a longitudinal direction; an insertion step of inserting the filter whose attitude has been adjusted from the front side to the back side of the water drain pipe by inserting the repair tool into the water drain pipe; The method for repairing a retaining wall includes an inserting process of adjusting the inserted filter so that it abuts against the rear end of the drain pipe, fitting it into the rear end, and then releasing the clamped state.

10. A method for repairing a retaining wall using the repair tool according to claim 6, comprising the steps of: If an existing filter is attached to the drainage pipe arranged in the retaining wall, the existing filter is removed before the filler injection step. the filter in the filter attachment step is a new filter different from the existing filter, The water drain pipe is cylindrical, and each of the existing filter and the new filter is a filter body attached to a frame having a circular dish shape and a flexible flange portion on its periphery, The existing filter removal step includes: a first clamping step of clamping the frame of the existing filter by inserting the repair tool into the water drain pipe; a first attitude adjustment step of adjusting an attitude of the clamped existing filter so that the attitude of the clamped existing filter is inclined with respect to the longitudinal direction of the water drain pipe by relatively moving the elongated members of the repair tool in a longitudinal direction; and a pulling-out process of pulling out the existing filter whose position has been adjusted from the back side to the front side of the water drain pipe by pulling out the repair tool from the water drain pipe, The filter attachment step includes: a second clamping step of clamping the frame of the new filter by the repair tool; a second attitude adjustment step of adjusting the attitude of the new filter so that the attitude of the new filter is inclined with respect to the longitudinal direction of the water drain pipe by relatively moving the elongated members of the repair tool in the longitudinal direction; an insertion step of inserting the new filter whose attitude has been adjusted from the front side to the back side of the water drain pipe by inserting the repair tool into the water drain pipe; The method for repairing a retaining wall includes an inserting process of adjusting the inserted new filter so that it abuts against the rear end of the drain pipe, fitting it into the rear end, and then releasing the clamped state.

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