Methods for repairing retaining walls and the tools used therefor.
The method addresses the challenge of filter attachment and filler entry in retaining wall repairs by using a repair tool for efficient filler removal and filter installation, maintaining drainage and reducing resistance, thus ensuring stable wall repair.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- STEP WORK CO LTD
- Filing Date
- 2024-12-02
- Publication Date
- 2026-06-12
Smart Images
Figure 2026095963000001_ABST
Abstract
Description
【Technical Field】 【0001】 The present invention relates to a method for repairing a retaining wall and a repair tool used therefor, and particularly to a method for repairing a retaining wall made of stacked stones, concrete blocks, etc. (including reinforcement methods) and a repair tool used for repairing a retaining wall. 【Background Art】 【0002】 Conventionally, there are various types of retaining walls such as concrete retaining walls, block-stacked retaining walls, and stone-stacked retaining walls. However, due to the progress of aging deterioration, cracks in the stacked stones and the outflow of bedding stones and earth and sand inside the retaining wall occur, and it can be seen that the strength of the retaining wall has decreased. In addition, some old retaining walls do not have drain pipes installed. In such cases, earth and sand containing rainwater, etc., may apply a larger earth pressure than usual to the outside of the retaining wall, leading to the risk of the retaining wall collapsing. Therefore, the need for repairing and reinforcing such retaining walls has been increasing in recent years. 【0003】 For example, when repairing a retaining wall without a drain pipe installed, it is necessary to retroactively install a drain pipe to ensure the drainage of the retaining wall. At that time, a filter for preventing the outflow of earth and sand, etc., is attached to the end portion of the drain pipe located on the inner side of the retaining wall. However, in order to achieve a stable attachment state of this filter to the drain pipe, it is common to use a filter frame with a maximum diameter larger than the diameter of the drain pipe. Therefore, first, the filter is attached from the outside of the drain pipe to the end portion of the drain pipe located on the inner side of the retaining wall, and then the drain pipe is installed on the retaining wall. It was difficult to retroactively attach the filter to the drain pipe previously installed on the retaining wall. Also, even when a drain pipe is pre-installed in the retaining wall, when a reinforcing filler made of mortar, etc., is poured into the crack of the retaining wall, the filler may flow into the inner side of the drain pipe or the filter attached to the inner end portion of the drain pipe. At that time, it was not easy to perform treatments such as removing the flowed-in filler or replacing the filter. 【0004】 One method for solving the above-mentioned problems is, for example, the one described in Patent Document 1. The invention described in Patent Document 1 is a method for reinforcing a stone retaining wall, characterized by comprising the steps of: inserting drainage members at predetermined intervals from the joints of the stacked stones of the stone retaining wall until they reach the innermost part of the cavity; inserting a nozzle from the joints of the stacked stones and injecting a foaming solidifying agent through the nozzle into the back wall of the cavity to form a barrier that covers the entire surface of the back wall; and after the foaming solidifying agent of the barrier has solidified, injecting a filler into the cavity from the joints of the stacked stones to fill the cavity. [Prior art documents] [Patent Documents] 【0005】 [Patent Document 1] Japanese Patent Publication No. 2015-040463 [Overview of the Initiative] [Problems that the invention aims to solve] 【0006】 The stone retaining wall reinforcement method described in Patent Document 1 involves forming a barrier that covers the entire surface of the back wall of the cavity in the stone retaining wall using a foaming solidifying agent. This prevents fillers such as mortar from penetrating into the backfill stones, thus reinforcing the stone retaining wall while maintaining its drainage. Furthermore, instead of using a typical drainage pipe, a long, permeable mat covered with a waterproof sheet is used as the drainage component, eliminating the need to install a filter. However, this method requires a foaming solidifying agent in addition to the usual filler, and each must be injected separately into the stone retaining wall, making it a time-consuming process. 【0007】 The present invention aims to provide a method for repairing retaining walls and repair tools used therein, which efficiently repair retaining walls while ensuring drainage, using general drainage pipes and filters without using special foaming solidifying agents such as those found in Patent Document 1. [Means for solving the problem] 【0008】 To achieve the above objective, the invention described in claim 1 is a method for repairing a retaining wall, comprising: a filler injection step of injecting a 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 the drainage pipe that the filler has not penetrated into an observation area located at the far end of the drainage pipe in the longitudinal direction, if the filler has penetrated into the observation area in the confirmation step, a treatment step of taking measures to ensure that the penetrated filler is no longer present in the observation area; and a filter installation step of installing a filter at the far end of the drainage pipe in the longitudinal direction after the confirmation step or treatment step. 【0009】 With this configuration, drainage from the drainage pipes will not be obstructed after the retaining wall has been repaired. 【0010】 The invention described in claim 2 is the configuration of the invention described in claim 1, wherein the treatment step includes removing the filler material that has entered the observation area through the drainage pipe. 【0011】 With this configuration, the packing material can be easily removed from the back of the drain pipe. 【0012】 The invention described in claim 3 is the configuration of the invention described in claim 1, wherein the treatment step includes relocating the drainage pipe to a position where no filler material has entered the observation area. 【0013】 With this configuration, there will be no filler material in the observation area. 【0014】 The invention described in claim 4 further comprises a pipe installation step, in which, in the configuration of the invention described in claim 1, drainage pipes are installed before the filler injection step when drainage pipes are not provided in the retaining wall. 【0015】 This configuration allows for the verification process to be carried out quickly. 【0016】 The invention described in claim 5 is the configuration of the invention described in claim 1, further comprising an existing filter removal step, in which, if an existing filter is attached to a drainage pipe arranged in a retaining wall, the existing filter is removed before the filler injection step. 【0017】 This configuration allows for the verification process to be carried out quickly. 【0018】 The invention described in claim 6 is a repair tool consisting of a pair of elongated members used in the retaining wall repair method described in claim 1, comprising: a clamping portion provided on one longitudinal end of the pair of elongated members capable of clamping a filter; a gripping portion provided on the other longitudinal end of the pair of elongated members and formed to be grippable; and a connecting portion between the clamping portion and the gripping portion that pivotally supports and connects the elongated members so that they can open and close relative to each other, wherein the elongated members are configured to be able to move relative to each other in the longitudinal direction when a filter is clamped. 【0019】 This configuration makes it easier to adjust the filter's position while holding it in place. 【0020】 The invention described in claim 7 is the configuration of the invention described in claim 6, wherein the clamping portion further comprises a removal portion capable of removing the filler material. 【0021】 With this configuration, it becomes possible to perform the treatment process using the removal unit. 【0022】 The invention described in claim 8 is the configuration of the invention described in claim 6, wherein the clamping portion is provided with an illumination portion capable of illuminating the observation area. 【0023】 This configuration allows for a clearer assessment of the conditions within the observation area. 【0024】 The invention according to claim 9 is a method for repairing a retaining wall using the repairing device according to claim 6. The drain pipe is cylindrical, and the filter is a filter body attached to a frame having a disk shape and a flange portion having flexibility at its peripheral portion. The filter attachment step includes a clamping step of clamping the frame of the filter by the repairing device, an attitude adjustment step of adjusting the attitude of the filter to be inclined with respect to the length direction of the drain pipe by relatively moving the long members of the repairing device in the longitudinal direction, an insertion step of inserting the filter with the adjusted attitude from the front side to the back side of the drain pipe by inserting the repairing device into the drain pipe, and a fitting step of adjusting the inserted filter to a posture in which it abuts against the back side end portion of the drain pipe, fitting it into the back side end portion, and then releasing the clamping state. 【0025】 With such a configuration, the length in the height direction from the upper end to the lower end of the flange portion of the filter with the adjusted attitude becomes shorter than the length in the height direction of the inner diameter of the drain pipe, and the resistance during filter insertion decreases, making it easier to attach the filter to the drain pipe. 【0026】 The invention according to claim 10 is a method for repairing a retaining wall using the repairing device according to claim 6, further comprising a step of removing an existing filter before the filling material injection step when the existing filter is attached to the drain pipe arranged on the retaining wall. The filter in the filter attachment step is a new filter different from the existing filter. The drain pipe is cylindrical. Each of the existing filter and the new filter has a filter body attached to a frame body having a disk shape and a flange portion with flexibility at its peripheral portion. The existing filter removal step includes a first clamping step of clamping the frame body of the existing filter by inserting the repairing device into the drain pipe, a first posture adjustment step of adjusting the posture of the clamped existing filter to be inclined with respect to the length direction of the drain pipe by relatively moving the long members of the repairing device in the longitudinal direction, and a pulling step of pulling out the existing filter with the adjusted posture from the back side to the front side of the drain pipe by pulling out the repairing device from the drain pipe. The filter attachment step includes a second clamping step of clamping the frame body of the new filter by the repairing device, a second posture adjustment step of adjusting the posture of the new filter to be inclined with respect to the length direction of the drain pipe by relatively moving the long members of the repairing device in the longitudinal direction, an insertion step of inserting the new filter with the adjusted posture from the front side to the back side of the drain pipe by inserting the repairing device into the drain pipe, and a fitting step of adjusting the inserted new filter to a posture in contact with the back end portion of the drain pipe, fitting it into the back end portion, and then releasing the clamping state. 【0027】 With such a configuration, the length in the height direction from the upper end to the lower end of the flange portion of the existing filter and the new filter with the adjusted posture is shorter than the length in the height direction of the inner diameter of the drain pipe, and the resistance during the pulling out of the existing filter and the insertion of the new filter is reduced, so that the replacement of the filter with respect to the drain pipe becomes easy. 【Effect of the Invention】 【0028】 As explained above, the invention described in claim 1 ensures drainage from the drainage pipe after the retaining wall has been repaired, thus providing an efficient repair method while maintaining drainage. 【0029】 In addition to the effects of the invention described in claim 1, the invention described in claim 2 allows for easy removal of the filling material from the back of the drainage pipe, thus easily ensuring the drainage of the retaining wall. 【0030】 In addition to the effects of the invention described in claim 1, the invention described in claim 3 ensures that there is no filler material in the observation area, thereby more reliably securing the drainage of the retaining wall. 【0031】 The invention described in claim 4, in addition to the effects of the invention described in claim 1, allows for a more efficient method of repairing retaining walls because the verification process can be carried out quickly. 【0032】 The invention described in claim 5, in addition to the effects of the invention described in claim 1, allows for a more efficient method of repairing retaining walls because the verification process can be carried out quickly. 【0033】 In addition to the effects of the invention described in claim 1, the invention described in claim 6 makes it easier to adjust the position of the filter while holding the filter, thus facilitating the filter installation process. 【0034】 In addition to the effects of the invention described in claim 6, the invention described in claim 7 allows the treatment process to be performed using the removal unit, thus facilitating the treatment process. 【0035】 In addition to the effects of the invention described in claim 6, the invention described in claim 8 allows for clearer confirmation of the conditions in the observation area, thus facilitating the confirmation process. 【0036】 The invention described in claim 9, in addition to the effects of the invention described in claim 6, makes the height of the flange portion of the adjusted filter shorter than the height of the inner diameter of the drain pipe, reducing resistance when inserting the filter. This makes it easier to attach the filter to the drain pipe, allowing the filter installation process to be carried out quickly and resulting in a more efficient method for repairing retaining walls. 【0037】 The invention described in claim 10, in addition to the effects of the invention described in claim 6, makes the height from the upper end to the lower end of the flange portion of the adjusted existing filter and the new filter shorter than the height of the inner diameter of the drain pipe. This reduces resistance when removing the existing filter and inserting the new filter, making it easier to replace the filter with the drain pipe. As a result, the process of removing the existing filter and installing the new filter can be carried out quickly, resulting in a more efficient method for repairing retaining walls. [Brief explanation of the drawing] 【0038】 [Figure 1] This is a schematic diagram showing the structure of a retaining wall according to the first embodiment of this invention. [Figure 2] This is a schematic front view of a repair tool according to the first embodiment of the present invention. [Figure 3] Figure 2 is a schematic rear view of the repair tool shown. [Figure 4] This is a schematic diagram showing the state in which a pair of long components of the repair tool shown in Figure 2 are moved relative to each other in the longitudinal direction. [Figure 5] This is a schematic diagram showing the repair tool shown in Figure 2 in the open position. [Figure 6] This figure shows a method for repairing a retaining wall according to the first embodiment of the present invention, where (1) is a schematic diagram showing the filler injection process in which a filler is injected into the interior of the retaining wall and the confirmation process to check the condition of the observation area, and (2) is a schematic diagram showing the condition of the observation area as observed from the front side of the drainage pipe. [Figure 7]This figure shows a retaining wall repair method according to the first embodiment of this invention, and is a schematic diagram showing a treatment process to ensure that the filler material that has entered the observation area is not present in the observation area. [Figure 8] This figure shows a method for repairing a retaining wall 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. [Figure 9] This is a schematic diagram of a filter according to the first embodiment of the present invention, where (1) is a schematic perspective view and (2) is a schematic bottom view. [Figure 10] This figure shows the 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 the clamping process in which the filter is clamped with a repair tool, and (2) is a schematic diagram showing the posture adjustment process in which the posture of the clamped filter is adjusted to be inclined with respect to the direction of the length of the drain pipe. [Figure 11] The first embodiment of this invention shows a diagram illustrating the filter installation process for a retaining wall repair method, where (1) is a schematic diagram showing an intermediate state in the insertion process in which the filter whose orientation has been adjusted in Figure 10 is inserted into the drainage pipe, and (2) is a schematic diagram showing the fitting process in which the clamping state of the filter by the repair tool is released after the inserted filter has been fitted into the drainage pipe. [Figure 12] This figure shows the process of removing an existing filter in a retaining wall repair method according to a second embodiment of the present invention, where (1) is a schematic diagram showing a first clamping step in which the filter is clamped with a repair tool, and (2) is a schematic diagram showing a first posture adjustment step and a first posture fixing step in which the posture of the clamped filter is adjusted to be inclined with respect to the direction of the length of the drain pipe. [Figure 13] This figure shows the process of removing an existing filter in a retaining wall repair method according to a second embodiment of the present invention, where (1) is a schematic diagram showing an intermediate state in the extraction process in which the filter whose position 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. [Modes for carrying out the invention] 【0039】 Figure 1 is a schematic diagram showing the structure of a retaining wall according to the first embodiment of this invention. 【0040】 Referring to Figure 1, the retaining wall 50 is a dry-stone retaining wall, and although this is a schematic depiction, at the front (left side of Figure 1), multiple stacked stones 51 are stacked diagonally upward toward the back (right side of Figure 1). Behind the stacked stones 51, filler stones 52 are inserted to stabilize the stacked state of the stacked stones 51. Although these filler stones 52 are not specifically depicted in Figure 1, it is assumed that some have fallen out, creating a cavity. Further behind the filler stones 52, backfill stones 53 are placed as a permeable layer for the retaining wall, and even further behind that, there is soil 54. Multiple cylindrical drainage pipes 60 are installed at predetermined intervals in the retaining wall 50, penetrating from the surface of the stacked stones 51 to the backfill stones 53. These drainage pipes 60 do not have filters attached for drainage. Furthermore, since adjacent stacked stones 51 are not sealed with joints or the like, gaps 55 exist between the stacked stones 51. 【0041】 Figure 2 is a schematic front view of a repair tool according to the first embodiment of this invention, and Figure 3 is a schematic rear view of the repair tool shown in Figure 2. 【0042】 Referring to Figures 1, 2, and 3 in addition to Figure 1, the repair device 1 consists of a pair of elongated members 3a and 3b punched out from steel plate, and is capable of clamping a filter for the 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 portion 10 for clamping the filter, which will be described later, is provided on one longitudinal end of the elongated members 3a and 3b (the lower end in Figures 2 and 3). A gripping portion 20, which is formed to be grippable, is provided on the other longitudinal end of the elongated members 3a and 3b (the upper end in Figures 2 and 3). Furthermore, the elongated members 3a and 3b are connected at a connecting portion 30 between the clamping portion 10 and the gripping portion 20, so that they overlap each other. 【0043】 Next, the clamping portion 10, the gripping portion 20, and the connecting portion 30 will be described in detail. 【0044】 The clamping portion 10 is formed in a hook shape with its tips facing inward, and has hooking portions 11a and 11b that can be used to hook the filter described later. Furthermore, the clamping portion 10 is formed in a mountain shape that protrudes inward from the hooking portions 11a and 11b towards the connection portion 30, and is provided with movement-preventing portions 12a and 12b that prevent the filter described later from moving unintentionally toward the connection portion 30. In addition, the clamping portion 10 is fitted with removal portions 15a and 15b that can be used to remove the filler material described later. The removal portions 15a and 15b are formed in the shape of cylindrical caps made of resin, and can be attached so as to cover the hooking portions 11a and 11b and the movement-preventing portions 12a and 12b, and are configured to be detachable. Furthermore, a small, detachable light, the illumination portion 17, is provided on the clamping portion 10 side of the long member 3b. The effects of configuring the clamping portion 10, removal portions 15a, 15b, and irradiation portion 17 of the repair tool 1 in this manner will be described later. 【0045】 The gripping portion 20 is formed by creating ring-shaped openings 21a and 21b in each of a pair of elongated members 3a and 3b. This improves operability because fingers can be passed through the inside of the openings 21a and 21b. 【0046】 Figure 4 is a schematic diagram showing the pair of long members of the repair device shown in Figure 2 moved relative to each other in the longitudinal direction, and Figure 5 is a schematic diagram showing the repair device shown in Figure 2 in the open state. 【0047】 Referring to Figures 4 and 5, the connecting portion 30 pivotally supports and connects the elongated members 3a and 3b so that they can open and close relative to each other. Specifically, as described above, the elongated members 3a and 3b are connected at the connecting portion 30 in a way that they overlap and intersect each other. When the gripping portions 20 are moved in the opening direction, away from each other, the clamping portions 10 also move in the opening direction, away from each other, and the elongated members 3a and 3b open. On the other hand, when the gripping portions 20 are moved in the closing direction, towards each other, the clamping portions 10 also move in the closing direction. Once the movement of the gripping portions 20 and the clamping portions 10 in the closing direction is complete, the elongated members 3a and 3b close, as shown in Figures 2 and 3. 【0048】 Furthermore, one of the long members 3a is provided with an elongated hole 31, and the other long member 3b is provided with a circular hole (not shown) at a position that overlaps with the first position 32, which is the clamping end 10 side of the elongated hole 31 of the long member 3a. The long members 3a and 3b are then fastened together by a fastener 35 that passes through the elongated hole 31 of the long member 3a and the circular hole of the long member 3b when they are overlapped. The fastener 35 consists of a bolt 36 and a nut 37. The bolt 36 passes through the elongated 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 with the bolt 36 from the back side (back side) of the long member 3b. Since the shaft of the bolt 36 passes through the elongated hole 31, when the nut 37 is loosened, the bolt 36 can move freely inside the elongated hole 31 between the first position 32 of the elongated hole 31 and the second position 33, which is the end of the elongated hole 31 on the gripping portion 20 side, as shown in Figures 2 and 4. Furthermore, by tightening the nut 37, the connecting portion 30 can be fixed at any position between the first position 32 and the second position 33, making it possible to fix the entire elongated members 3a and 3b. 【0049】 The fastener 35 fixes the longitudinal positional relationship of the long members 3a and 3b, but does not obstruct the opening and closing of the long members 3a and 3b. However, it may be configured so that the open or closed state can be fixed by tightening it more strongly. 【0050】 The relative longitudinal movement of these elongated members 3a and 3b is possible not only when the elongated members 3a and 3b are in a closed state, but also when they are in an open state. Specifically, as will be described later, this allows the elongated members 3a and 3b to move relative to each other in the longitudinal direction while the filter described later is sandwiched between them. 【0051】 The effects of configuring the connection section 30 in this way will be described later. 【0052】 Next, we will explain the method for repairing the retaining wall 50. Here, we will use the repair tool 1 described above. 【0053】 Figure 6 shows a retaining wall repair method according to the first embodiment of the present invention, where (1) is a schematic diagram showing the filler injection process in which filler is injected into the interior of the retaining wall and the confirmation process to check 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 (1) in Figure 6, a hose 72 for injecting a filler material 70 made of mortar or the like into the gaps 55 between the stacked stones 51 of the retaining wall 50 is inserted from the front to the back of the retaining wall 50. Once it is confirmed that the hose 72 has reached the stones 52, the filler material 70 is pumped into the interior of the retaining wall 50, injecting it to fill the stones 52 and the gaps 55 in particular. In this way, the filler material injection process is completed. 【0055】 Next, referring to both Figure 6(1) and Figure 6(2), a verification step is performed to confirm through the drainage pipe 60 that the injected filler material 70 has not entered the observation area 57 located at the far end of the drainage pipe 60. Specifically, as indicated by the arrow in Figure 6(1), the observation area 57 is observed by looking from the front to the back of the drainage pipe 60 (observation step). Then, as shown in Figure 6(2), it can be confirmed that the filler material 70 has entered the upper left side of the observation area 57. This completes the verification step, which is the observation step. If necessary, to confirm the observation area 57, the irradiation part 17 of the repair tool 1 shown in Figure 2 may be inserted from the front to the back of the drainage pipe 60 to irradiate the observation area 57. In this way, the condition of the observation area 57 can be confirmed more clearly, making the verification step easier to perform. 【0056】 If the filler material 70 hardens while it is in the observation area 57, the flow of water from the backfill stone 53 to the drainage pipe 60 will be blocked, hindering drainage from the drainage pipe 60. Therefore, it is necessary to ensure that the filler material 70 is not present in the observation area 57. 【0057】 Figure 7 is a diagram illustrating a retaining wall repair method according to the first embodiment of the present invention, and is a schematic diagram showing a treatment process to ensure that the filler material that has entered the observation area is not present in the observation area. 【0058】 Referring to Figure 7, if the filler material 70 has entered the observation area 57 during the verification process, a treatment process is performed to ensure that the entered filler material 70 is no longer present in the observation area 57. This treatment process includes a filler material removal process to remove the filler material 70 that has entered the observation area 57 via the drainage pipe 60. Specifically, first, the repair tool 1, with the removal parts 15a and 15b attached to the clamping part 10, is inserted into the drainage pipe 60 from the front to the back. Next, the removal parts 15a and 15b are applied to the filler material 70 present in the observation area 57, and the filler material 70 is entangled, for example, by rotating the repair tool 1 around its length axis. After that, the repair tool 1 is pulled out to the front of the drainage pipe 60, completing the treatment process, which is the filler material removal process. 【0059】 In this way, the filler material 70 can be easily removed from the back of the drainage pipe 60, thus easily ensuring the drainage of the retaining wall 50. Furthermore, by using the repair tool 1, the treatment process can be carried out using the removal parts 15a and 15b, making the treatment process easier to perform. 【0060】 In this first embodiment, the long members 3a and 3b of the repair tool 1 are slightly separated to remove the filler material 70, but the clamping part 10 may remain closed. Also, if the observation area 57 is illuminated using the irradiation unit 17 during the work, the position of the filler material 70 can be easily confirmed, resulting in a more efficient method for repairing the retaining wall 50. 【0061】 Figure 8 shows 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, 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 Figure 8(1), after performing the treatment process, the verification process is performed again. Specifically, the observation process involves looking into the observation area 57 from the front of the drain pipe 60, as indicated by the arrows, to confirm the situation. As shown in Figure 8(2), it can be confirmed that the filler material 70 is not present in the observation area 57, and that the filler material 70 has been removed from the observation area 57. 【0063】 If it is confirmed during the verification process that the filler material 70 remains in the observation area 57, the treatment process, which is the filler material removal process, is repeated until the filler material 70 is removed. 【0064】 Furthermore, although not shown in the diagram, the above-described treatment process may also be a pipe relocation process in which the drainage pipe 60 is moved to a location where no filler material 70 that has entered the observation area 57 exists. After relocating the drainage pipe 60, the confirmation process is performed again, and if it is confirmed that the filler material 70 has entered the observation area 57 again, the pipe relocation process and confirmation process are repeated. 【0065】 By implementing this treatment process, the filler material 70 will not be present in the observation area 57, thus ensuring more reliable drainage of the retaining wall 50. 【0066】 Next, we will describe the filter installation process, which involves attaching a drainage filter to the drainage pipe 60 that has undergone the treatment process. Here, we will describe the method using the repair tool 1. 【0067】 Figure 9 is a schematic diagram of a 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】 Referring to Figure 9, the filter 40 consists of a circular filter body 48 made of nonwoven fabric mounted inside a resin frame 41 which is dish-shaped and has a flexible flange portion 42 on its periphery. In addition, numerous small holes 44 are formed in the dish-shaped bottom portion 43 of the frame 41 of the filter 40. 【0069】 Referring also to Figure 1, such a filter 40 is attached to the far end of the drain pipe 60 (the side in contact with the backfill stones 53), and its role is to block the backfill stones 53 and soil 54 while allowing only water that can pass through the filter body 48 and small holes 44 to be discharged from the drain pipe 60. 【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 drain pipe 60 shown in Figure 1. As a result, when the filter 40 is fitted into the drain pipe 60, the flange portion 42 covers the outer surface of the far end of the drain pipe 60, reducing the risk of the filter 40 tipping over towards the front of the drain pipe 60. 【0071】 Figure 10 is a diagram showing the 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 the clamping process in which the filter is clamped with a repair tool, and (2) is a schematic diagram showing the posture adjustment process in which the posture of the clamped filter is adjusted to be inclined with respect to the direction of the length of the drain pipe. 【0072】 Referring to (1) in Figure 10, and again to Figures 2 and 9, first remove the removal parts 15a, 15b and the irradiation part 17 of the repair tool 1. Next, operate the gripping part 20 of the repair tool 1 in the opening direction to slightly open the long members 3a and 3b together. Then, hook the hook part 11a of the clamping part 10 onto any one of the small holes 44 of the filter 40, and similarly hook the hook part 11b onto any other of the small holes 44. Furthermore, operate the gripping part 20 in the closing direction to move the long members 3a and 3b together in the closing direction, and the filter 40 is clamped, completing the clamping process for the filter 40. 【0073】 By hooking the hooks 11a and 11b of the clamping part 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 drain pipe 60. 【0074】 Furthermore, as described above, the repair tool 1 has hooks 11a and 11b on the clamping part 10, which allows the filter 40 to be clamped while being hooked, thus ensuring that the filter 40 is securely held. In addition, because the hooks 11a and 11b are hook-shaped, the hooked filter 40 is less likely to come off, thus stabilizing the hooked state of the filter 40. 【0075】 Furthermore, as explained in Figures 2 and 3, the repair tool 1 is provided with a clamping portion 10 and movement-preventing portions 12a and 12b. This prevents the clamping portion 10 from being inserted into the filter 40, thus preventing the filter body 48 from falling off the filter frame 41 shown in Figure 4 due to over-insertion of the hooking portions 11a and 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 41 of the filter 40 is formed to be slightly larger than the inner diameter of the drain pipe 60. Therefore, 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 (2) in Figure 10 and again to Figure 4, with the filter 40 held in place, the fastener 35 of the connection part 30 of the repair device 1 is moved from the first position 32 to the second position 33 of the elongated hole 31 of the elongated member 3a, thereby moving the elongated members 3a and 3b relative to each other in the longitudinal direction. Accordingly, the position of the filter 40 is tilted at a predetermined angle with respect to the longitudinal direction of the drain pipe 60. Although this tilt angle is not particularly limited, it is preferable to tilt the filter 40 by about 30° from the state in which it is aligned with the drain pipe 60 (about 60° with respect to the longitudinal direction of the drain pipe 60). By adjusting the position of the filter 40 in this way, the position adjustment process is completed. 【0078】 When the filter 40 is tilted, the length L3 in the height direction (in the direction perpendicular to the insertion direction of the filter 40 in Figure 10) from the upper end 46a to the lower end 46b of the flange portion 42 of the frame 41 of the filter 40 is shorter than the length L2 in the height direction of the inner diameter of the drain pipe 60. 【0079】 In this posture adjustment process, as described above, the repair device 1 has an elongated hole 31 in the elongated member 3a, and the elongated members 3a and 3b are overlapped and fastened together with a fastener 35. This allows the other elongated member 3b to be moved longitudinally by the length of the elongated hole 31 relative to the other elongated member 3a, thus facilitating the adjustment of the posture of the filter 40. 【0080】 Next, when the fastener 35 is fastened to fix the connection part 30, the entire length members 3a and 3b are fixed, and the position of the filter 40, which was adjusted in the position adjustment process, is also fixed. This completes the process of fixing the position of the filter 40. 【0081】 By fixing the connection part 30 in this posture fixing process, the filter 40 can be inserted into the drain pipe 60 as described later while maintaining a constant posture, thus 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 a retaining wall repair method according to the first embodiment of the present invention, where (1) is a schematic diagram showing an intermediate state of the insertion process in which the filter whose orientation has been adjusted in Figure 10 is inserted into the drainage pipe, and (2) is a schematic diagram showing the fitting process in which the clamping state of the filter by the repair tool is released after the inserted filter has been fitted into the drainage pipe. 【0083】 Referring to (1) in Figure 11, insert the repair tool 1 with the connection part 30 fixed into the drain pipe 60 from the front to the back, and then insert the filter 40, whose position has been adjusted, into the drain pipe 60 from the front to the back. 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 in the depth direction of the filter 40 (the direction that penetrates the plane of the paper in Figure 11), the depth-direction ends 47a and 47b, which are part of the flange part 42, will be pressed against the inner surface of the drain pipe 60. On the other hand, the height-direction length L3 of the flange part 42 of the filter 40 from the upper end 46a to the lower end 46b is shorter than the height-direction length L2 of the inner diameter of the drain pipe 60, so the flange part 42 of the filter 40 will be separated from the inner surface of the drain pipe 60 in the height direction. Therefore, the resistance to the drain pipe 60 when inserting the filter 40 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. Regarding the backfill stones (not shown) located behind the rear end 62 of the drain pipe 60, the insertion of the filter 40 should be enough to push the backfill stones aside to the extent that the filter 40 can be installed. 【0085】 In this insertion process, as described above, the repair tool 1 has movement-preventing parts 12a and 12b on the clamping part 10, which prevents the filter 40 from moving toward the connection part 30, thus stabilizing the clamped state of the filter 40. Furthermore, since the movement-preventing parts 12a and 12b have a mountain-like shape that protrudes inward from each other, the movement of the filter 40 toward the connection part 30 is reliably prevented, resulting in an even more stable clamped state of the filter 40. 【0086】 Next, referring to (2) in Figure 11 and again to Figure 2, after the filter 40 has passed the far end 62 of the drain pipe 60, loosen the fastener 35 of the connection part 30 of the repair tool 1 to release the fixed state of the long members 3a and 3b. Then, move the fastener 35 from the second position 33 to the first position 32 of the elongated hole 31 of the long member 3a, and move the long members 3a and 3b relative to each other. As a result, the posture of the filter 40 changes again, and the flange portion 42 of the frame 41 of the filter 40 becomes aligned with the far end 62 of the drain pipe 60. In other words, the filter 40 is in a position to abut against the far end 62 of the drain pipe 60. In this state, pull the repair tool 1 out to the front side of the drain pipe 60 and fit the filter 40 so that the flange portion 42 of the filter 40 abuts against the far end 62 of the drain pipe 60. Subsequently, the hooks 11a and 11b of the clamping portion 10 of the repair tool 1 are pulled out from the small holes 44 of the filter 40, releasing the clamping state and completing the process of fitting the filter 40. 【0087】 Finally, by pulling out the repair tool 1 towards the front of the drain pipe 60 indicated by the arrow, the filter installation process is completed, and the repair of the retaining wall 50 is finished. 【0088】 The retaining wall 50 repair method, which consists of the treatment process and filter installation process described above, allows the filter 40 to be installed afterwards when there is no filler material 70 in the observation area 57, thereby preventing the filler material 70 from flowing into the back of the drainage pipe 60 or into the filter 40. As a result, drainage from the drainage pipe 60 is not obstructed after the retaining wall 50 is repaired, making it an efficient repair method while ensuring drainage. 【0089】 Furthermore, in the method of repairing the retaining wall 50 using the repair device 1 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, whose posture has been adjusted, becomes shorter than the height length L2 of the inner diameter of the drain pipe 60. This reduces the resistance when inserting the filter 40, 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, making it a more efficient method of repairing the retaining wall 50. 【0090】 In addition, as described above, the repair tool 1 is configured so that the long members 3a and 3b can move relative to each other in the longitudinal direction while the filter 40 is being held in place. This makes it easier to adjust the position of the filter 40 while it is being held in place, thus facilitating the filter installation process. 【0091】 Furthermore, the repair device 1 has a fastener 35 that is movable between the first position 32 and the second position 33 of the elongated hole 31, and can be fixed between the first position 32 and the second position 33 by the fastener 35. This makes it possible to freely move and fix the other elongated member 3b between the first position 32 and the second position 33 of the elongated hole 31 relative to the other elongated member 3a, thus making it even easier to adjust the posture of the filter 40. 【0092】 Furthermore, by attaching the filter 40 to the drainage pipe 60, which does not have a drainage filter installed beforehand, it becomes possible to prevent the outflow of feed stones 52, backfill stones 53, and soil 54. This prevents the formation of voids on the far side of the drainage pipe 60, which reduces the risk of collapse of the retaining wall 50 and improves disaster prevention. 【0093】 Furthermore, although the repair method for the retaining wall 50 in the first embodiment described above involved the use of a repair tool 1, the present invention can be achieved if the filter 40 can be retrofitted to the drain pipe 60 without using the repair tool 1. 【0094】 Next, a method for repairing a retaining wall 50 will be described when an existing filter is attached to a drainage pipe 60 located in the retaining wall 50. In this case, the method for repairing the retaining wall 50 further includes an existing filter removal step, in which the existing filter is removed before the filler injection step. 【0095】 Figure 12 is a diagram showing the existing filter removal process of a retaining wall repair method according to a second embodiment of the present invention, where (1) is a schematic diagram showing the first clamping process in which the filter is clamped with a repair tool, and (2) is a schematic diagram showing the first posture adjustment process and the first posture fixing process in which the posture of the clamped filter is adjusted to be inclined with respect to the direction of the length of the drain pipe. 【0096】 The structures of the retaining wall 50, drainage pipe 60, and repair device 1 in this second embodiment are the same as those in the first embodiment, and the structure of the existing filter 80 is the same as the filter 40 in the first embodiment. Therefore, the differences will be explained in detail here. 【0097】 Referring to (1) in Figure 12 and again to Figure 9, first, operate the gripping part 20 of the repair tool 1 in the opening direction to slightly open the long members 3a and 3b. Next, insert the repair tool 1 into the drain pipe 60, hook the hook part 11a of the clamping part 10 onto any one of the small holes 84 of the existing filter 80, and similarly hook the hook part 11b onto any other of the small holes 84. Subsequently, operate the gripping part 20 in the closing direction to move the long members 3a and 3b together in the closing direction, and the existing filter 80 is clamped, completing the first clamping process. 【0098】 Next, referring to Figure 12(2) and Figure 4 again, with the existing filter 80 being held in place, the fastener 35 of the connection part 30 of the repair device 1 is moved from the first position 32 to the second position 33 of the elongated hole 31 of the elongated member 3a, thereby moving the elongated members 3a and 3b relative to each other in the longitudinal direction. Accordingly, the posture of the existing filter 80 tilts at a predetermined angle with respect to the length direction of the drain pipe 60, pushing aside the backfill stone (not shown). Although this tilt angle is not particularly limited, it is preferable to tilt the existing filter 80 by about 30° (about 60° with respect to the length direction of the drain pipe 60) from the state in which the existing filter 80 is aligned with the far end 62 of the drain pipe 60. By adjusting the posture of the existing filter 80 in this way, the first posture adjustment step is completed. 【0099】 Next, when the fastener 35 is fastened to fix the connection part 30, the entire length members 3a and 3b are also fixed. This fixes the position of the existing filter 80 that was adjusted in the first position adjustment step, and the first position fixing step is completed. 【0100】 When the existing filter 80 is tilted, the length L4 in the height direction (in the direction perpendicular to the withdrawal direction of the existing filter 80 in Figure 13) from the upper end 86a to the lower end 86b of the flange portion 82 of the frame 81 of the existing filter 80 is shorter than the length L2 in the height direction of the inner diameter of the drain pipe 60. 【0101】 Figure 13 is a diagram showing the existing filter removal process of a retaining wall repair method according to a second embodiment of the present invention, where (1) is a schematic diagram showing an intermediate state of the extraction process in which the filter whose position 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 (1) in Figure 13, the repair tool 1 with the connection part 30 fixed is pulled out from the back to the front of the drain pipe 60, and the existing filter 80, whose position has been adjusted, is pulled out from the back to the front of the drain pipe 60. At this time, since the existing filter 80 has the same structure as 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 that penetrates the plane of the paper in Figure 13), the depth-direction ends 87a and 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 height-direction length L4 of the flange part 82 of the existing filter 80 from the upper end 86a to the lower end 86b is shorter than the height-direction length L2 of the inner diameter of the drain pipe 60, so 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 removing the existing filter 80 can be reduced. 【0103】 Referring to (2) in Figure 13, the removal process is completed when the existing filter 80 has been pulled out until it exceeds the front end 61 of the drain pipe 60. The removed existing filter 80 is then removed from the repair tool 1. 【0104】 This completes the process of removing the existing filter. 【0105】 In this existing filter removal process, the first position fixing process allows the existing filter 80 to be pulled out of the drain pipe 60 while maintaining a constant position, thus facilitating the removal of the existing filter 80 from the drain pipe 60. 【0106】 Next, referring again to Figures 6 to 8, the removal section 15a, 15b and the irradiation section 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 that time, by performing the aforementioned process of removing the existing filter, it becomes easier to check the observation area 57 on the far side of the drain pipe 60, and the check process can be carried out quickly, resulting in a more efficient method of repairing the retaining wall 50. 【0108】 After confirming through the verification process that the packing material 70 is not present in the observation area 57 as shown in Figure 8, a filter installation process is carried out to install a new filter. 【0109】 Referring again to Figure 10(1), the filter installation step in the retaining wall 50 repair method of this second embodiment includes a second clamping step in which a new filter 90, different from the existing filter 80, is clamped by the repair tool 1. The new filter 90 has the same structure as the filter 40 of the first embodiment. Furthermore, this second clamping step corresponds to the clamping step of 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】 Next, referring again to (2) in Figure 10, a second posture adjustment step is performed, which corresponds to the posture adjustment step of the filter mounting method in the first embodiment. Specifically, in the same manner as described in the first embodiment, the posture of the new filter 90 is adjusted by moving the long members 3a and 3b of the repair tool 1 relatively in the longitudinal direction while the new filter 90 is being held. 【0111】 Next, a second posture fixing step, which corresponds to the posture fixing step of the filter mounting method in the first embodiment, is performed. Specifically, the posture of the new filter 90 is fixed by fixing the connection part 30 of the repair device 1 in the same manner as described in the first embodiment. 【0112】 When the new filter 90 is tilted, similar to 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 91 of the new filter 90 is shorter than the height length L2 of the inner diameter of the drain pipe 60. 【0113】 Next, referring again to (1) in Figure 11, an insertion step corresponding to the insertion step of the filter mounting method in the first embodiment is performed. Specifically, in the same manner as described in the first embodiment, the new filter 90, whose orientation has been adjusted, is inserted from the front side to the back side of the drain pipe 60 until the new filter 90 exceeds the rear end 62 of the drain pipe 60. 【0114】 In this case, similar to the first embodiment, the diameter of the flange portion 92 of the frame 91 of the new filter 90 is slightly larger than the inner diameter of the drain pipe 60. Therefore, in the depth direction of the new filter 90 (the direction that penetrates the plane of the paper in Figure 10), the depth-direction ends 97a and 97b, which are part of the flange portion 92, are pressed against the inner surface of the drain pipe 60. On the other hand, the height-direction length L3 of the flange portion 92 of the new filter 90 from the upper end 96a to the lower end 96b is shorter than the height-direction length L2 of the inner diameter of the drain pipe 60. Therefore, the flange portion 92 of the new filter 90 is separated from the inner surface of the drain pipe 60 in the height direction. As a result, the resistance to the drain pipe 60 when inserting the new filter 90 can be reduced. 【0115】 Next, referring to (2) in Figure 11, a fitting process corresponding to the fitting process of the filter installation method in the first embodiment is performed. Specifically, in the same manner as described in the first embodiment, the long members 3a and 3b of the repair tool 1 are moved relative to each other to adjust the position of the new filter 90 so that it contacts the rear end 62 of the drain pipe 60, and then the new filter 90 is fitted so that the flange portion 92 of the new filter 90 contacts the rear end 62 of the drain pipe 60. 【0116】 In this way, the filter installation process for the new filter 90 is completed, and the repair of the retaining wall 50 is completed. 【0117】 In the retaining wall 50 repair method, which consists of the filter removal process and filter installation process described above, the height lengths L3 and L4 from the upper ends 86a and 96a to the lower ends 86b and 96b of the flange portions 82 and 92 of the existing filter 80 and the new filter 90, whose positions have been adjusted, become shorter than the height length L2 of the inner diameter of the drain pipe. This reduces the resistance when pulling out the existing filter 80 and inserting the new filter 90, making it easier to replace the filter on the drain pipe 60. As a result, the existing filter removal process and the filter installation process can be carried out quickly, resulting in a more efficient method for repairing the retaining wall 50. 【0118】 Furthermore, although the repair method for the retaining wall 50 in the second embodiment described above involved the use of a repair tool 1, the present invention can be achieved if it is possible to remove the existing filter 80 from the drain pipe 60 and retrofit the new filter 90 to the drain pipe 60 without using the repair tool 1. 【0119】 Furthermore, while the first and second embodiments described above assumed that drainage pipes 60 were pre-installed in the retaining wall 50, some retaining walls may not have drainage pipes installed. In such cases, a pipe installation process is performed to install drainage pipes in the retaining wall before the filler injection process. This allows for a quicker verification process, resulting in a more efficient method for repairing the retaining wall 50. 【0120】 In the embodiments described above, the retaining wall was a dry-stone retaining wall, but it is not limited to this, and other types of retaining walls, such as a mortared concrete block retaining wall, may also be used. 【0121】 Furthermore, in each of the above embodiments, the retaining wall may be an existing one or a newly constructed one. 【0122】 Furthermore, in each of the embodiments described above, the retaining wall had a backfill of stones as a permeable layer behind the drainage pipe, but the invention also applies to retaining walls that are directly buried with soil or other materials. 【0123】 Furthermore, in each of the embodiments described above, gaps existed between the stacked stones. However, if no gaps exist, holes for injecting the filler material can be pre-formed in the retaining wall, and a hose can be inserted into these holes to inject the filler material. 【0124】 Furthermore, in the above embodiments, the confirmation step was performed after the filler injection step. However, the filler injection step and the confirmation step may be performed in parallel by injecting the filler while checking the condition of the observation area from the drain pipe. This would allow for a quicker response. 【0125】 Furthermore, in each of the above embodiments, the treatment step was carried out because it was confirmed in the confirmation step that the filler material had entered the observation area. However, if the filler material has not entered the observation area in the confirmation step, the filter installation step can be carried out without performing the treatment step. 【0126】 Furthermore, in each of the embodiments described above, the confirmation step is performed by a visual observation step, but it may also be performed by other means such as a small camera or sensor. 【0127】 Furthermore, although the clamping step was performed before the posture adjustment step in the first embodiment described above, it is not limited to this. The filter may be clamped by the clamping step after the long members of the repair device have been moved relative to each other by the posture adjustment step. 【0128】 Furthermore, although the second clamping step was performed before the second posture adjustment step in the second embodiment described above, the invention is not limited to this. The filter may be clamped by the second clamping step after the long members of the repair tool have been moved relative to each other by the second posture adjustment step. 【0129】 Furthermore, although the first embodiment described above included a posture fixing step, this step may be omitted. In that case, the repair tool should be operated to maintain the posture of the filter adjusted in the posture adjustment step. 【0130】 Furthermore, although the first embodiment described above included a first posture fixing step and a second posture fixing step, the first posture fixing step and the second posture fixing step may be omitted. In that case, the repair tool should be operated to maintain the posture of the filter adjusted by the first posture adjustment step and the second posture adjustment step. 【0131】 Furthermore, in each of the embodiments described above, the confirmation step, treatment step, and filter installation method each involved the use of specific repair tools, but repair tools are not required. Alternatively, other means may be used. 【0132】 Furthermore, in the second embodiment described above, each of the methods for removing the existing filter involved the use of a repair tool, but it is not necessary to use a repair tool. Alternatively, methods other than using a repair tool may be used. 【0133】 Furthermore, in each of the embodiments described above, the repair tools were formed by punching out steel plates, but the materials and manufacturing methods are not limited to these. They may be made of wood or resin, or formed by casting. 【0134】 Furthermore, in each of the above embodiments, the length of the repair tool is not limited and may be long enough for the user to push their arm in and for the gripping portion to reach the far end of the drain pipe. For ease of operation, it is preferable that the tool be longer than the drain pipe to which the filter is to be installed and replaced, and it is even more preferable that the gripping portion is long enough to extend outside the drain pipe. 【0135】 Furthermore, while the clamping portion had a specific shape in each of the above embodiments, it is not limited to this. It may have other shapes, such as one with a bumpy or uneven surface for gripping. 【0136】 Furthermore, although the clamping portion had a hooking portion in each of the above embodiments, the hooking portion is not required. 【0137】 Furthermore, while the hook portion in each of the above embodiments had a hook shape, it is not limited to this. It may also have other shapes such as a T-shape. 【0138】 Furthermore, although the clamping portion had a movement-preventing portion in each of the above embodiments, the movement-preventing portion is not required. 【0139】 Furthermore, in the above embodiments, the movement-blocking parts had a mountain-like shape with each part facing inward, but this is not limited to this. They may also face outward, or be formed in a semi-circular shape, or have other orientations or shapes. 【0140】 Furthermore, although the clamping portion had a removal portion in each of the above embodiments, the removal portion may be omitted. 【0141】 Furthermore, in each of the above embodiments, the removal section was formed in the shape of a cylindrical cap made of resin, but it may be spoon-shaped, spiral-shaped, or any other shape that facilitates the removal of the filler material. 【0142】 Furthermore, in each of the above embodiments, an irradiation section was provided on the clamping side of the long member, but the irradiation section may be omitted. 【0143】 Furthermore, although the illumination unit was a small light in each of the above embodiments, it may be provided by other means. 【0144】 Furthermore, while the gripping portion had a specific shape in each of the above embodiments, it is not limited to this. It may also have other shapes, such as being formed as a thick rod without an opening, with a grip wrapped around it to make it easier to hold. 【0145】 Furthermore, while the connecting portion had a specific shape in each of the above embodiments, it is not limited to this. Any other configuration is acceptable as long members can be pivotally supported so as to be able to open and close, and the long members can be moved relative to each other in the longitudinal direction while the filter is being held between them. For example, one of a pair of long members may be provided with a first elongated hole, and the other of the pair of long members may be provided with a second elongated hole of the same shape as the first elongated hole, positioned to overlap with the first elongated hole, and the long members may be fastened together by a fastener that passes through the first and second elongated holes while they are overlapping. In this way, one long member and the other long member can be moved relative to each other in the longitudinal direction by the length of the first and second elongated holes, making it easy to fine-tune the position of the filter. 【0146】 Furthermore, in each of the embodiments described above, the fastening portion was composed of a bolt and a nut, but it is not limited to this and may be composed of other components. 【0147】 Furthermore, while the filters in the above embodiments had specific structures, they are not limited to these. Any filter that can be attached to a drain pipe may have a conical shape, feet to prevent the filter from falling out inside the drain pipe, or a frame with a perforated cover to prevent the filter body from falling out. 【0148】 Furthermore, while the above embodiments involved mounting the filter body within a frame, the system is not limited to this configuration. The filter frame may have fine holes to provide the same functionality as the filter body, thus eliminating the need for a separate filter body. 【0149】 Furthermore, while the flange portion of the filter was flexible in each of the above embodiments, it is not limited to this. It may not be flexible as long as it can be inserted into the drain pipe and attached by reducing its diameter or the like. 【0150】 Furthermore, in each of the above embodiments, the material of the filter frame is not particularly limited. It should not be a material that deteriorates in the soil. 【0151】 Furthermore, while the filter body in each of the above embodiments was made of nonwoven fabric, it is not limited to this. It may also be made of a resin frame with multiple holes. 【0152】 Furthermore, while the filters in the above embodiments had a specific shape, they are not limited to this, and the shape of the filter may be deformed when it is inserted into or removed from the drain pipe. [Explanation of Symbols] 【0153】 1… Repair tools 3a, 3b...Long members 10...Holding part 15a, 15b...removal part 17…Irradiation area 20...Gripping part 30…Connection part 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 the drain pipe 62... The far end of the drain pipe 70…Filling material 80…Existing filters 90... New filter In each figure, the same reference numeral indicates the same or corresponding part.
Claims
[Claim 1] A method for repairing retaining walls, A filler injection step in which a filler is injected into the interior of the retaining wall through gaps in the retaining wall or holes formed in the retaining wall, A verification step is to confirm, via the drainage pipe, that the filling material has not penetrated into the observation area located at the rear end in the longitudinal direction of the drainage pipe installed in the retaining wall, In the verification step, if the filler material has entered the observation area, the procedure step involves taking measures to ensure that the entered filler material is no longer present in the observation area. A method for repairing a retaining wall, comprising: a filter installation step of installing a filter on the inner side in the longitudinal direction of the drain pipe after the confirmation step or the treatment step has been performed. [Claim 2] The method for repairing a retaining wall according to claim 1, wherein the treatment step includes removing the filler material that has entered the observation area through the drainage pipe. [Claim 3] The method for repairing a retaining wall according to claim 1, wherein the treatment step includes relocating the drainage pipe to a position where no filler material has entered the observation area. [Claim 4] The method for repairing a retaining wall according to claim 1, further comprising a pipe installation step of installing the drainage pipe before the filler injection step if the drainage pipe is not provided in the retaining wall. [Claim 5] A method for repairing a retaining wall according to claim 1, further comprising an existing filter removal step, in which, if an existing filter is attached to a drainage pipe arranged in the retaining wall, the existing filter is removed before the filler injection step. [Claim 6] A repair tool consisting of a pair of long members used in the method for repairing a retaining wall according to claim 1, A clamping portion is provided on one end of the pair of elongated members in the longitudinal direction, capable of clamping the filter. A gripping portion is provided on the other end of the pair of elongated members in the longitudinal direction and is formed to be grippable, Between the clamping portion and the gripping portion, there is a connecting portion that pivotally supports and connects the long members so that they can open and close relative to each other. A repair tool configured such that, while the filter is held between the long members, the long members can move relative to each other in the longitudinal direction. [Claim 7] The repair tool according to claim 6, wherein the clamping portion further comprises a removal portion for removing the filler material. [Claim 8] The repair device according to claim 6, wherein the clamping portion is provided with an illumination portion capable of illuminating the observation area. [Claim 9] A method for repairing a retaining wall using the repair tool described in claim 6, The drain pipe is cylindrical, and the filter is a circular dish-shaped frame with a flexible flange portion at its periphery, with the filter body mounted on it. The filter installation process described above is: A clamping step in which the frame of the filter is clamped with the repair tool, A posture adjustment step involves adjusting the position of the filter so that it is inclined with respect to the length direction of the drain pipe by moving the long members of the repair device relative to each other in the longitudinal direction, Inserting the aforementioned repair tool into the drain pipe, the filter whose orientation has been adjusted is inserted into the drain pipe from the front to the back. A method for repairing a retaining wall, comprising: adjusting the inserted filter to a position where it abuts the rear end of the drain pipe, fitting it into the rear end, and then releasing the clamped state. [Claim 10] A method for repairing a retaining wall using the repair tool described in claim 6, If an existing filter is attached to the drainage pipe located in the retaining wall, the existing filter is further removed before the filler injection step, and the existing filter is removed. The filter in the filter installation step is a new filter that is different from the existing filter. The drain pipe is cylindrical in shape, and each of the existing filter and the new filter is a frame with a disc shape and a flexible flange portion on its peripheral edge, with the filter body mounted on it. The aforementioned process of removing the existing filter is as follows: The first clamping step involves inserting the repair tool into the drain pipe to clamp the frame of the existing filter, A first posture adjustment step involves moving the long members of the repair device relative to each other in the longitudinal direction to adjust the position of the clamped existing filter so that it is inclined with respect to the longitudinal direction of the drain pipe, The process includes a step of pulling out the existing filter, whose position has been adjusted, from the back to the front of the drain pipe by pulling out the repair tool from the drain pipe, The filter installation process described above is: The repair tool is used to clamp the frame of the new filter in a second clamping step, A second posture adjustment step involves moving the long members of the repair device relative to each other in the longitudinal direction to adjust the posture of the new filter so that it is inclined with respect to the longitudinal direction of the drain pipe, Insertion step: Insert the repair tool into the drain pipe, thereby inserting the new filter, whose orientation has been adjusted, from the front to the back of the drain pipe. A method for repairing a retaining wall, comprising: adjusting the newly inserted filter to a position where it abuts the rear end of the drain pipe; fitting it into the rear end; and then releasing the clamped state.