Retaining wall reinforcement method

Abstract

To provide a method for reinforcing a retaining wall, which can exert a further reinforcing effect without significantly increasing the workload and cost. [Solution] A reinforcement method for a retaining wall (1) formed by stacking stones or mortar blocks, which are the object (2) to be stacked, the method comprises a reinforcement installation process in which a mesh fiber sheet or fiber rope, which is a reinforcing material (10), is installed along the joints (3) extending horizontally, with spaces in the depth direction of the joints (3) of the object (2), and the reinforcing material (10) is installed along the joints (3) extending vertically, and a filler injection process in which filler (6) is filled into the space above the reinforcing material (10) to integrate the reinforcing material (10) with the filler (6), and the method is applicable to both existing and newly constructed retaining walls.

Description

[Technical Field]

[0001] The present invention relates to a method for reinforcing a retaining wall in which the objects to be stacked are stones or mortar blocks. [Background technology]

[0002] Retaining walls are known as walls that support the ground of buildings and other structures. Retaining walls are wall-like structures that are installed to prevent soil from collapsing on slopes with varying elevations. Examples of retaining walls include block retaining walls and masonry retaining walls. These retaining walls are made by piling up materials such as concrete blocks and stones.

[0003] As a preventative measure against disasters, it is necessary to take measures not only for the buildings on top of the retaining wall, but also for the retaining wall itself. If an inspection of the retaining wall reveals concerns about its earthquake resistance, rebuilding the wall is often not realistic due to constraints such as cost, neighboring property boundaries, and small land area. In this regard, various construction methods are being implemented to reinforce the existing retaining wall while leaving it in place.

[0004] For example, the method of reinforcing a retaining wall described in Patent Document 1 can reinforce a retaining wall that has already been constructed, such as a masonry wall, while it is still in its installed state.When injecting filler material into gaps in the existing retaining wall, a narrow through-hole is formed through the retaining wall, a perforated pipe is inserted into the through-hole, and the filler material is injected through the perforated pipe, so that the filler material is sufficiently filled even in the hollow space at the back of the retaining wall. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 6054334 Summary of the Invention [Problem to be solved by the invention]

[0006] The method of reinforcing a retaining wall described in Patent Document 1 is a construction method for reinforcing a retaining wall while leaving the existing wall in place, but its purpose is to ensure that the retaining wall can be reinforced with a small number of steps, and its direct purpose is not to enhance the reinforcing effect. Considering the possibility that a large load will be applied to the retaining wall due to an earthquake or heavy rain, a reinforcement construction method for a retaining wall that directly aims to achieve a reinforcing effect and can exert an even greater reinforcing effect is desired.

[0007] In view of the above-mentioned background, the present invention aims to provide a method for reinforcing a retaining wall that can achieve a greater reinforcing effect without significantly increasing the workload or cost. [Means for solving the problem]

[0008] In order to achieve the above-mentioned object, the retaining wall reinforcement method of the present invention is a method for reinforcing a retaining wall in which the objects to be stacked are stones or mortar blocks, and comprises a reinforcing material installation process in which a mesh fiber sheet or fiber rope, which is a reinforcing material, is installed along the joints extending horizontally, with spaces in the depth direction of the joints of the objects, and the reinforcing material is installed along the joints extending vertically, and a filler injection process in which a filler is filled in the space above the reinforcing material and the reinforcing material is integrated with the filler, and is characterized in that it can be used for both existing and newly constructed retaining walls.

[0009] The retaining wall reinforcement method of the present invention preferably includes an additional reinforcement step of driving reinforcing bars into the ground from above the reinforcing material.

[0010] It is also preferable to provide an additional reinforcing step in which the reinforcement member is extended rearward from an upper portion of the reinforcement member, and the extended reinforcement member is buried in the ground and connected to a support. [Effects of the Invention]

[0011] According to the present invention, cracks in the filler between adjacent stones are less likely to occur, thereby reinforcing the entire retaining wall and helping to prevent the wall from collapsing due to increased earth pressure caused by earthquakes, heavy rain, and other factors. Specifically, the reinforcement is installed along the joints in both horizontal and vertical directions, enveloping the entire retaining wall. Therefore, compared to a structure without reinforcement, the entire retaining wall has increased resistance and strength to stresses (earth pressure, water pressure, bending stress, shear stress, and overturning moment) caused by earthquakes, heavy rain, and other factors. Furthermore, the reinforcing material, the mesh fiber sheet or fiber rope, is made of a fibrous material, which provides excellent corrosion resistance, strength, and durability. It is also easily integrated with the filler, making it suitable as a reinforcing material. It is also inexpensive, lightweight, and flexible. It does not require significant load during installation, facilitating construction and significantly reducing the workload and costs. Furthermore, the reinforcing material is embedded in the filler, preventing the retaining wall's aesthetic appearance.

[0012] According to a configuration including an additional reinforcement step, the members used for the additional reinforcement are not exposed to the outside, so the reinforcing effect of the retaining wall can be increased without damaging the aesthetic appearance of the retaining wall. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a front view of a retaining wall that is an example of a target for a retaining wall reinforcement method according to an embodiment of the present invention. [Figure 2] A longitudinal section of the retaining wall shown in Figure 1. [Figure 3] 1 is a flowchart of a method for reinforcing a retaining wall according to one embodiment of the present invention. [Figure 4] An enlarged view of part B of the retaining wall shown in Figure 2. [Figure 5] A vertical cross-sectional view showing the main parts of a retaining wall after the joint removal process has been carried out in one embodiment of the present invention. [Figure 6] A vertical cross-sectional view showing the main parts of a retaining wall after the preliminary injection process in one embodiment of the present invention. [Figure 7] A vertical cross-sectional view showing the main parts of a retaining wall after the reinforcement material installation process in one embodiment of the present invention. [Figure 8] In one embodiment of the present invention, a front view of a main part of a retaining wall after a reinforcing material installation process [Figure 9] FIG. 2 is an enlarged view of a reticulated fiber sheet according to an embodiment of the present invention. [Figure 10] A vertical cross-sectional view showing the main parts of a retaining wall after the finishing injection process in one embodiment of the present invention. [Figure 11] A front view of the main parts of a retaining wall after construction is completed in one embodiment of the present invention. [Figure 12] 1 is a longitudinal cross-sectional view of a retaining wall for explaining the reinforcing effect of a retaining wall reinforcing method according to one embodiment of the present invention. [Figure 13] FIG. 4 is a diagram showing another example of a mesh fiber sheet according to an embodiment of the present invention. [Figure 14] 1 is a diagram showing a fiber rope according to an embodiment of the present invention. [Figure 15] A front view of a main part of a retaining wall after an additional reinforcement process in one embodiment of the present invention. [Figure 16] A longitudinal cross-sectional view of a retaining wall after an additional reinforcement process in one embodiment of the present invention. [Figure 17] A longitudinal cross-sectional view of a retaining wall after another additional reinforcement process in one embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0014] An embodiment of the present invention will be described below with reference to the drawings. Fig. 1 is a front view of a retaining wall 1, and Fig. 2 is a longitudinal cross-sectional view of the retaining wall 1. The retaining wall 1 shown in Fig. 1 is a masonry retaining wall made by piling up stones 2. Retaining walls 1 are usually installed continuously over long distances along roads or the like, but Fig. 1 shows only a portion of the wall in the longitudinal direction (the direction of arrow a) for convenience. Fig. 2 shows a typical example of a longitudinal cross-section of a masonry retaining wall, and the shape and number of stones 2 do not necessarily match the configuration in Fig. 1.

[0015] The retaining wall 1 in the following embodiment is a retaining wall constructed by kneading, in which mortar or the like is poured between stones to join them together and stack them, but the present invention can also be applied to retaining walls constructed by dry masonry, in which mortar or the like is not poured between stones. When the present invention is applied to a retaining wall constructed by dry masonry, the joint chipping process (step 100 in FIG. 3) described below is not necessary, so it is sufficient to start with the advance injection process (step 104 in FIG. 3).

[0016] Furthermore, although the retaining wall 1 in the following embodiment is made by stacking stones 2, the present invention is also applicable to a retaining wall made by stacking mortar blocks.

[0017] In Figure 2, a sloped area 8 is formed adjacent to a flat area 7, and a retaining wall 1 is installed on the sloped area 8. Backfill stones 5 are filled between the bodies of adjacent stones 2 and on the backside of the stones 2. In Figure 1, the gaps between stones 2 are joints 3. As shown in Figure 2, the joints 3 are filled with filler (mortar) 4. The retaining wall 1 shown in Figures 1 and 2 is an existing retaining wall.

[0018] A retaining wall reinforcement method according to the present invention will be described below with reference to the flowchart in FIG. 3. FIG. 4 is an enlarged view of portion B of the retaining wall shown in FIG. 2 (the same applies to FIGS. 5 to 7 and 10). FIG. 4 shows a main portion of the retaining wall 1 before the reinforcement method is applied. Before construction, the filler 4 filled in the joints 3 of the retaining wall 1 to be constructed has deteriorated over time. At the start of construction, a joint chipping process is carried out (step 100 in FIG. 3). "Chipping" refers to scraping or breaking the stones 2. In this embodiment, chipping is performed on the four sides of the joints 3 of each stone 2. Chipping removes portions of the four sides of the joints 3 of each stone 2 and also removes the existing filler 4 in the joints 3. Because the main purpose of chipping in this embodiment is to remove the existing filler 4, the basic shape of each stone 2 is maintained even after chipping.

[0019] Chisels, hammers, and other manual tools can be used for chipping, but typically electric or air chippers are used. Figure 5 shows the main part of the retaining wall 1 after the joint chipping process has been carried out. In this figure, the existing filler 4 (Figure 4) has been removed by chipping.

[0020] After the joint chipping process, a foreign matter removal process is carried out (step 101 in Figure 3). In this process, foreign matter such as soil and roots in the joints 3 is scraped out with a sickle and then removed with an air blower or the like. After the foreign matter removal process, a joint cleaning process (step 102 in Figure 3) and a water absorption adjuster application process (step 103 in Figure 3) are carried out to prepare the base. In the joint cleaning process, a high-pressure washer or the like is used to clean the joints 3 and wash away soil and the like in the joints 3. In the water absorption adjuster application process, a sprayer is used to apply a water absorption adjuster to the stones 2 near the joints 3. The application of the water absorption adjuster improves the adhesive performance between the filler 6 (Figure 10) that will be filled later and the base.

[0021] After the water absorption adjuster application process, a preliminary injection process, which is a filler injection process, is carried out (step 104 in Figure 3). The preliminary injection is carried out, for example, by discharging filler supplied from an injection pump through a nozzle. Figure 6 shows the main part of the retaining wall 1 after the preliminary injection process. As a result of the preliminary injection, filler 6 has been filled in the backside of the stones 2 and in the joints 3. However, in the depth direction of the joints 3, a space is left where the filler 6 has not been filled (part c in Figure 6). The dimension of part c is, for example, about 200 mm. The filler 6 may be, for example, mortar or resin mortar (the same applies to the filler 6 in the finish injection process described later).

[0022] After the preliminary injection process, the reinforcing material installation process is carried out (step 105 in Figure 3). Figure 7 shows the main part of the retaining wall 1 after the reinforcing material installation process. Figure 8 is a front view of the main part of the retaining wall 1 after the reinforcing material installation process (view from the arrow C in Figure 7). As shown in Figure 7, a reticulated fiber sheet 10, which is a reinforcing material, is installed on the surface of the filler 6. The sheet thickness of the reticulated fiber sheet 10 is about 1 to 3 mm, but for ease of illustration, it is exaggerated in Figure 7 (the same applies to Figures 10, 12, 16, and 17).

[0023] In Figure 8, long, strip-shaped mesh fiber sheets 10 are installed in both the horizontal direction (direction of arrow a) and the vertical direction (direction of arrow b). In the horizontal direction, one strip-shaped mesh fiber sheet 10 is installed along the joints 3 extending in the horizontal direction. Similarly, in the vertical direction, one strip-shaped mesh fiber sheet 10 is installed along the joints 3 extending in the vertical direction. When installing the mesh fiber sheet 10, U-shaped nails or the like may be hammered in to prevent the mesh fiber sheet 10 from lifting up.

[0024] The width of the mesh fiber sheet 10 may be adjusted to match the width of the joints 3, and may be, for example, 30 to 40 mm. There are no particular limitations on the length of the mesh fiber sheet 10, and it may be cut to the required size from a roll of mesh fiber sheet 10. Furthermore, one strip-shaped mesh fiber sheet 10 may be formed by tying together a plurality of strip-shaped mesh fiber sheets 10.

[0025] FIG. 9 shows an enlarged view of the mesh fiber sheet 10, corresponding to an enlarged view of portion D in FIG. 8. The mesh fiber sheet 10 is formed from elongated fiber material 10a, which are crossed to form a mesh-like band-like member as a whole. Because the mesh fiber sheet 10 is formed from the fiber material 10a, it has excellent corrosion resistance, strength, and durability, making it suitable as a reinforcing material. Furthermore, because of its mesh shape, the mesh fiber sheet 10 can be easily integrated with a filler, which also makes it suitable as a reinforcing material.

[0026] Furthermore, the mesh fiber sheet 10 formed from the fiber material 10a is not only inexpensive, lightweight, and flexible, but also requires no significant load during installation, making construction easy. Furthermore, mesh fiber sheets 10 can be tied together, which also facilitates construction. In other words, the reinforcement method of the present invention can achieve a greater reinforcement effect without significantly increasing the workload or cost.

[0027] Since the reticulated fiber sheet 10 is a reinforcing material, it is desirable that it has high strength, and the tensile strength is preferably 750 MPa or more, and more preferably 800 MPa or more.

[0028] After the reinforcement installation process, the finish injection process, which is a filler injection process, is carried out (step 106 in Figure 3). Figure 10 shows the main parts of the retaining wall 1 after the finish injection process. The finish injection is a process of filling the joints 3 with filler 6, similar to the preliminary injection, but the reticulated fiber sheet 10 is integrated with the filler 6 by the finish injection. The finish injection is carried out, for example, by ejecting the filler 6 supplied from an injection pump from a nozzle. As shown in Figure 10, the reticulated fiber sheet 10 is embedded in the filler 6 by the finish injection. Because the reticulated fiber sheet 10 is embedded in the filler 6 by the finish injection, when the joints 3 are viewed from the front side, the reticulated fiber sheet 10 is not visible and the filler 6 is exposed.

[0029] After the finishing injection process, a surface finishing process is carried out (step 107 in FIG. 3). In the surface finishing process, the surface of the filler 6 is smoothed and leveled with a trowel, and then the surface of the filler 6 is finished with a brush before the filler 6 hardens.

[0030] After the surface finishing process, a surface cleaning process is carried out (step 108 in Figure 3). In the surface cleaning process, dirt on the stonework surface is removed using high-pressure cleaning. Through the above processes, the reinforcement of the retaining wall 1 is completed. Figure 11 is a front view of the main part of the retaining wall 1 after construction is completed (view from the arrow C in Figure 10). As shown in this figure, the joints 3 have been filled with filler 6, and as shown in Figure 10, the reticulated fiber sheet 10 is embedded in the filler 6, so the reticulated fiber sheet 10 is not exposed on the surface of the retaining wall 1.

[0031] The reinforcing effect of the present invention will be described below with reference to Fig. 12. Fig. 12(a) is an enlarged view of part E in Fig. 10. Fig. 12(b) is an enlarged view of a comparative example, which is a configuration in which the mesh fiber sheet 10 is omitted from the configuration of Fig. 12(a). In Figs. 12(a) and (b), the first stone from the top is called stone 2c, and the second stone from the top is called stone 2d.

[0032] In Figure 12(a), let us assume that a force is applied to stone 2c in a direction (the direction of arrow H) that causes stone 2c to peel off from the slope 8. In this case, force F2 acts on the filler 6 in the joint 3 between stone 2c and stone 2d in the direction of arrow H on the side of stone 2c, and force F2 acts in the direction opposite to the direction of arrow H on the side of stone 2d. In other words, a shear force acts on filler 6, and this shear force acts to create a crack that separates filler 6 into upper and lower halves.

[0033] FIG. 12(b) shows the state of a comparative example when a force similar to that shown in FIG. 12(a) is applied. In FIG. 12(b), the stone 2c protrudes in the direction of arrow H, and cracks appear in the filler 6. In this embodiment, as shown in FIG. 12(a), a mesh-like fiber sheet 10 is embedded in the filler 6 so as to separate the front and back of the filler 6. As mentioned above, the mesh-like shape of the mesh-like fiber sheet 10 makes it easy to integrate with the filler, and the adhesive strength between the mesh-like fiber sheet 10 and the filler 6 is increased. Therefore, in this embodiment, the reinforcing effect of the mesh-like fiber sheet 10 makes it less likely for cracks to appear in the filler 6, as shown in FIG. 12(b).

[0034] In Figure 12, the filler 6 between vertically adjacent stones 2c and 2d is less likely to crack in this embodiment shown in Figure 12(a), but this also applies to the filler 6 between horizontally adjacent stones 2. Specifically, the cross-sectional shape of the filler 6 between horizontally adjacent stones 2 (cross-sectional shape along line FF in Figure 11) is the same as in Figure 12(a). Therefore, when a force acts in the direction that causes the stone 2 to protrude, a shear force (F1, F1) acts on the filler 6 between the horizontally adjacent stones 2, as in Figure 12(a). However, the reinforcing effect of the mesh fiber sheet 10 inside the filler 6 makes it less likely to crack.

[0035] Although the shear forces (F2, F2) shown in Figure 12(a) act in the front-to-back direction, the reticulated fiber sheet 10 also provides a similar reinforcing effect when the shear force acts in the up-down direction. In Figure 11, horizontally adjacent stones are called stones 2a and 2b. Suppose that a force acts on stone 2a in a direction that pushes stone 2a downward (in the direction of arrow G) due to unequal settlement or the like. In this case, force F1 acts on the filler 6 in the joint 3 between stones 2a and 2b in the direction of arrow G on the stone 2a side, and force F1 acts in the direction opposite to the direction of arrow G on the stone 2b side. In other words, although shear forces (F1, F1) act on the filler 6, the reinforcing effect of the reticulated fiber sheet 10 inside the filler 6 makes it less likely to crack.

[0036] The above explanation of the reinforcing effect focused on the gaps between adjacent stones 2. However, by reducing the likelihood of cracks occurring in the filler 6 between adjacent stones 2, the entire retaining wall is reinforced, which is beneficial in preventing the wall from collapsing due to increased earth pressure caused by earthquakes, heavy rain, and other factors. Specifically, as described above, in Figure 8, the mesh fiber sheet 10 is installed along the joints 3 in both the horizontal direction (in the direction of arrow a) and the vertical direction (in the direction of arrow b). This allows the mesh fiber sheet 10 to encase the entire retaining wall. Therefore, compared to a configuration without the mesh fiber sheet 10, the entire retaining wall has increased resistance and strength to stresses (earth pressure, water pressure, bending stress, shear stress, and overturning moment) caused by earthquakes, heavy rain, and other factors. As a result, in Figure 11, the collapse of the surface portion (part d) formed by multiple stones 2 in the vertical direction can be prevented, and the collapse of the surface portion (part e) formed by multiple stones 2 in the horizontal direction can also be prevented.

[0037] The reinforcing material will be described in more detail below. In the above embodiment, an example in which a mesh fiber sheet 10 is used as the reinforcing material is described, and one example of the shape is shown in Figure 9. The mesh fiber sheet is not limited to that shown in Figure 9, and may be any sheet in which elongated fiber materials are crossed to form a mesh-like band-shaped member as a whole. In the mesh fiber sheet 11 shown in Figure 13(a), elongated fiber materials 11a are inclined with respect to the longitudinal direction of the mesh fiber sheet 11, and the intersections between the fiber materials 11a form an X-shape.

[0038] The elongated fiber material constituting the mesh fiber sheet may be a single fiber material, or may be formed by twisting together fiber materials. The mesh fiber sheet 12 shown in FIG. 13(b) is the same as those shown in FIGS. 9 and 13(a) in that it forms a mesh, but the configuration of the fiber material 12a is different. FIG. 13(c) shows an enlarged view of part I in FIG. 13(b). As shown in FIG. 13(c), the fiber material 12a is formed by twisting together fiber materials. This configuration increases the strength of the mesh fiber sheet 12 and makes it easier to integrate with the filler.

[0039] In the above embodiment, the reinforcing material has been described as a mesh fiber sheet, but this is not limiting and a fiber rope may also be used. The fiber rope 13 shown in FIG. 14 is formed by twisting elongated fiber material 13a. Like the mesh fiber sheet, the fiber rope 13 is inexpensive, has excellent corrosion resistance, and is strong and durable, making it suitable as a reinforcing material. Furthermore, the surface of the fiber rope 13 is uneven, making it easy to integrate with a filler, which also makes it suitable as a reinforcing material. Furthermore, like the mesh fiber sheet, the fiber rope 13 is not only lightweight and flexible, but also does not require a large load during installation, making construction easy.

[0040] An embodiment relating to the additional reinforcement step will be described below. Figures 15 and 16 show an embodiment in which the driving of anchors (reinforcing bars) 20 is added to the above embodiment. Figure 15, like Figure 8, is a front view of the main part of the retaining wall 1 after the installation step of the reticulated fiber sheet 10 (view taken along arrow C in Figure 7). Figure 16 is a longitudinal cross-sectional view of the retaining wall 1 cut along the reticulated fiber sheet 10.

[0041] As shown in Figure 15, anchors 20 are driven into the reticulated fiber sheet 10. More specifically, as shown in Figure 16, anchors 20 are made by adding flanges 22 to rods 21. Rods 21 penetrate the reticulated fiber sheet 10 and are buried in the ground on the slope 8, with flanges 22 holding down the reticulated fiber sheet 10. The flange 22 side of anchors 20 is buried in filler 6. With this configuration, anchors 20 are not exposed to the outside, and the reinforcing effect of retaining wall 1 can be increased without detracting from the aesthetic appearance of retaining wall 1.

[0042] FIG. 17 is a longitudinal cross-sectional view of the retaining wall 1 cut along the reticulated fiber sheet 10 when another additional reinforcement step is performed. As shown in FIG. 17, at the top of the reticulated fiber sheet 10, the reticulated fiber sheet 10 is extended rearward from the top by an extension 14. The extension 14 may be a new reticulated fiber sheet 10, fiber rope, or the like, attached to the reticulated fiber sheet 10 installed in the joint 3. The extension 14 is connected to a support 50 buried in the ground. The support 50 may be, for example, a steel pipe pile, an anchor, or a sheet pile.

[0043] The extension 14 is buried in the upper part of the slope 8, so it is easy to add it to the retaining wall 1 after construction. Also, the support 50 can be driven into the ground from the surface of the slope 8, so it is easy to add it to the retaining wall 1 after construction, just like the extension 14. The embodiment of FIG. 17 is as follows: Nobu The long portion 14 and the support 50 are not exposed to the outside, so that the same as the embodiment of FIG. , support The reinforcing effect of the retaining wall 1 can be increased without impairing the aesthetic appearance of the wall 1.

[0044] Although one embodiment of the present invention has been described above, the embodiment is merely an example and may be modified as appropriate. For example, the embodiment described above is a reinforcement method for an existing retaining wall, but a reinforcing material installation step (step 105 in FIG. 3) may also be performed when constructing a new retaining wall. In other words, the present invention is applicable to both existing and newly constructed retaining walls.

[0045] Furthermore, in the above embodiment, an example was described in which two filler injection processes, a preliminary injection process (step 104 in Figure 3) and a finishing injection process (step 106 in Figure 3), were carried out. However, for retaining walls constructed using a method in which mortar or concrete is poured and joined together while being piled up, such as a retaining wall constructed using kneading masonry, the preliminary injection process may be omitted.

[0046] Furthermore, a drainage member installation process may be added after the joint cleaning process (step 102 in FIG. 3). In the drainage member installation process, drainage members are inserted at predetermined intervals between the stones 2. The drainage members may be pipes or permeable members covered with a waterproof sheet. [Explanation of symbols]

[0047] 1. Retaining wall 2,2a,2b,2c,2d stone 3 Joint 4,6 Fillers 5 Backfill stone 7 flat land 8 Slope 10,11,12 Meshed fiber sheet 13 Fiber rope 10a, 11a, 12a, 13a Fiber material 14 Extension 20 Anchor (reinforcing rod) 50 Support

Claims

1. A reinforcement method for a retaining wall in which the object to be stacked is stone or granite blocks, A reinforcing material installation process in which a reticulated fiber sheet, which is a reinforcing material, is installed along the joints extending in the horizontal direction while there is a space in the depth direction of the joints of the object, and the reinforcing material is installed along the joints extending in the vertical direction; a filler injection step of filling the space above the reinforcing material with a filler to integrate the reinforcing material with the filler, A retaining wall reinforcement method that can be used for both existing and newly constructed retaining walls.

2. 2. The method for reinforcing a retaining wall according to claim 1, further comprising an additional reinforcing step of driving reinforcing bars from above the reinforcing material and burying the reinforcing bars in the ground.

3. A retaining wall reinforcement method as described in claim 1, which includes an additional reinforcement step of extending the reinforcement rearward at the top of the reinforcement, burying the extended reinforcement in the ground, and connecting it to a pile-shaped support buried in the ground.

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