Retaining wall

Abstract

To provide a retaining wall, in which the time required for the formation of a foundation and the lamination of retaining wall blocks is shortened and which is also removed easily.SOLUTION: In the retaining wall in which the time required for forming a foundation 5 and stacking retaining wall blocks 7 is short and removal is easy, the foundation blocks 1 provided with a plurality of frustum-shaped through-holes 11,12 penetrating from an upper surface 16 to a lower surface 17 are placed on the surface of leveled ground 6. The retaining wall 8 is constructed by stacking retaining wall blocks 7 on an upper surface 23 of a cover block 2 by blocking up a through-hole 11,12 of a foundation block 1 by an under surface 24 of the cover block 2 placed on an upper surface of the foundation block 1 in a state of charging crushed stones 4 into the respective through-holes 11,12 of the foundation block 1.SELECTED DRAWING: Figure 13

Description

[Technical Field]

[0001] The present invention relates to a retaining wall that requires a short time to form the foundation and stack the retaining wall blocks, and is easy to remove. [Background technology]

[0002] A retaining wall is constructed by stacking retaining wall blocks on a solid foundation (Patent Document 1 or Patent Document 2). The retaining wall disclosed in Patent Document 1 is constructed by stacking retaining wall blocks on top of a foundation (concrete foundation) formed by spreading crushed stone evenly over an excavated root area and pouring concrete into a formwork assembled on top of the crushed stone (Patent Document 1,

[0053] [Figure 3]). The retaining wall disclosed in Patent Document 2 is also constructed basically in the same way as the retaining wall disclosed in Patent Document 1 (Patent Document 2,

[0013] [Figure 1]). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-316462 [Patent Document 2] Japanese Patent Application Publication No. 09-003935 Summary of the Invention [Problem to be solved by the invention]

[0004] The retaining walls disclosed in Patent Documents 1 and 2 stabilize the stacked state of the retaining wall blocks by stacking them on top of a firmly formed foundation. However, a foundation formed by pouring concrete over a layer of crushed stone takes time to form. If a retaining wall is only needed temporarily, it is preferable that the time required to form the foundation and stack the retaining wall blocks is short and that it is easy to remove. Therefore, we studied a retaining wall that takes short time to form the foundation and stack the retaining wall blocks and is easy to remove. [Means for solving the problem]

[0005] As a result of their research, they have developed a retaining wall that requires little time to form the foundation and stack the retaining wall blocks, and is easy to remove, characterized in that foundation blocks with multiple frustum-shaped through holes that penetrate from the top to the bottom are placed on the surface of leveled ground, crushed stone is poured into each of the through holes in the foundation blocks, the through holes in the foundation blocks are blocked by the undersides of cover blocks placed on the top of the foundation blocks, and the retaining wall blocks are stacked on the top of the cover blocks. The retaining wall of the present invention is constructed with foundation blocks and crushed stone as its foundation.

[0006] The present invention can also be used to create a retaining wall, which is characterized by using bottomed retaining wall blocks instead of cover blocks, placing foundation blocks with a plurality of truncated cone-shaped through holes that penetrate from the top to the bottom on the surface of leveled ground, pouring crushed stone into each of the through holes in the foundation blocks, and then blocking the through holes in the foundation blocks with the bottomed retaining wall blocks placed on the top of the foundation blocks, and constructing the retaining wall by stacking the bottomed retaining wall blocks on top of the bottomed retaining wall blocks.

[0007] The retaining wall of the present invention is constructed by forming a foundation on the surface of the ground that is continuous with the ground surface or on the surface of the ground excavated from the ground surface. The retaining wall is basically constructed by assigning one retaining wall block to one foundation block and stacking the same retaining wall blocks, but it may also be constructed by assigning one retaining wall block to multiple foundation blocks or multiple retaining wall blocks to one foundation block. A large retaining wall is constructed by lining up multiple foundation blocks and retaining wall blocks in the direction of the retaining wall extension.

[0008] The through-holes in the foundation blocks are frustum-shaped, with the cross-sectional area increasing from the top to the bottom, and examples include a truncated pyramid shape and a truncated cone shape. A truncated cone-shaped through-hole is basically structured so that the central axis (the line connecting the centers of gravity of horizontal cross-sections at different heights) coincides with a vertical line, but the central axis may intersect the vertical line or be twisted. Multiple through-holes of the same shape may be lined up, or a combination of different shapes may be lined up.

[0009] The lower surface of the cover block is large enough to cover all of the through-holes in the foundation blocks, and preferably the entire surface is in contact with the upper surface of the foundation blocks. The cover block can be placed on each foundation block lined up in the direction of the retaining wall to block the through-holes of each foundation block, or it can be placed across adjacent foundation blocks lined up in the direction of the retaining wall to block half of the through-holes of each adjacent foundation block. The upper surface of the cover block needs to be at least as large as the lower surface or lower frame of the retaining wall blocks to be stacked.

[0010] The bottom of the retaining wall block is large enough to cover all of the through-holes in the foundation blocks, and preferably the entire block is in contact with the top of the foundation block. The bottomed retaining wall block can be placed on each of the foundation blocks lined up in the direction of the retaining wall to block the through-holes of each block, or placed across adjacent blocks lined up in the direction of the retaining wall to block half of the through-holes of each adjacent block. The top of the bottomed retaining wall block only needs to be at least as large as the bottom of the retaining wall block or bottom frame to be stacked.

[0011] In a configuration in which a lid block is used, the foundation block may have a convex portion on its upper surface, and the lid block may have a concave portion on its lower surface into which the convex portion of the foundation block fits; the lid block may have a convex portion on its upper surface, and the lowest retaining wall block may have a concave portion on its lower surface or lower frame into which the convex portion of the lid block fits. Also, in a configuration in which a bottomed retaining wall block is used, the foundation block may have a convex portion on its upper surface, and the lowest bottomed retaining wall block may have a concave portion on its lower surface into which the convex portion of the foundation block fits. In either case, the lower retaining wall block may have a convex portion on its upper surface or upper frame, and the upper retaining wall block may have a concave portion on its lower surface or lower frame into which the convex portion of the lower retaining wall block fits. It is desirable that the convex portions and concave portions have a transfer structure so that they can fit as tightly as possible.

[0012] In addition, the foundation blocks are preferably configured with height adjusters that can adjust the amount of protrusion, protruding toward the ground surface. The height adjusters change the posture of the foundation blocks placed on the leveled ground surface. From the perspective of allowing greater freedom in adjusting the posture of the foundation blocks, it is preferable to have a total of four height adjusters, located symmetrically in the front and back and left and right of the foundation blocks. The height adjusters are preferably provided on protruding portions that protrude horizontally from the cover blocks that are placed on the foundation blocks. A specific example of a height adjuster is a bolt that is screwed into a through-type insert built into the protruding portion. [Effects of the Invention]

[0013] In the retaining wall of the present invention, crushed stone placed in the through-holes is pressed against the ground surface while being blocked by the cover block or the bottom-bottomed retaining wall block, preventing the foundation blocks from shifting relative to the ground surface. Because the multiple through-holes are small, it is easy to constrain the crushed stone, and the crushed stone is pressed stably against the ground surface without shifting. Thus, the retaining wall of the present invention has the advantage that it takes a short time to form the foundation and stack the retaining wall blocks, and is easy to remove.

[0014] The engagement of the convex and concave portions positions and prevents misalignment of the lid block relative to the foundation block, the lowest retaining wall block relative to the foundation block, the lowest retaining wall block relative to the lid block, and the upper retaining wall block relative to the lower retaining wall block, thereby stabilizing the posture of the retaining wall. The height adjustment device protruding from the foundation block adjusts the posture of the foundation block, thereby leveling the posture of the lid block or the lowest bottomed retaining wall block placed on the lid block and aligning the heights of the adjacent lid blocks or the lowest bottomed retaining wall blocks, thereby stabilizing the posture of the retaining wall. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 is a perspective view showing an example of a foundation block used in a retaining wall of the present invention. [Figure 2] 2 is a cross-sectional view taken along the line AA in FIG. [Figure 3] 1. FIG. [Figure 4] FIG. 10 is a perspective view showing a flat lid block to be placed on the foundation block of this example. [Figure 5] FIG. 10 is a perspective view showing retaining wall blocks to be stacked on the foundation of this example. [Figure 6] This is an oblique view showing step 1 of constructing a retaining wall, showing the state in which foundation blocks are placed on the surface of leveled ground. [Figure 7] This is a right side view showing construction procedure 1 of a retaining wall, showing the state in which foundation blocks have been placed on the surface of leveled ground. [Figure 8] This is an oblique view showing procedure 2 of constructing a retaining wall, illustrating the state in which the posture of the foundation block is adjusted using a height adjustment device. [Figure 9] This is a right side view showing the second step in constructing a retaining wall, showing the state in which the posture of the foundation block is adjusted using a height adjustment device. [Figure 10] This is an oblique view showing retaining wall construction procedure 3, showing crushed stone being poured through the through holes in the foundation blocks. [Figure 11] This is a right side view showing retaining wall construction procedure 3, showing crushed stone being poured through the through holes in the foundation blocks. [Figure 12] This is an oblique view showing procedure 4 of constructing a retaining wall, showing a state in which a flat cover block has been placed on a foundation block after crushed stone has been poured into the through hole. [Figure 13] This is a right side view showing construction procedure 4 of a retaining wall, showing a flat cover block placed on the foundation block after crushed stone has been poured into the through hole. [Figure 14] This is an oblique view showing retaining wall construction procedure 5, illustrating the process of stacking frame-structured retaining wall blocks on a flat cover block. [Figure 15] This is a right side view showing retaining wall construction procedure 5, illustrating the process of stacking frame-structured retaining wall blocks on a flat cover block. [Figure 16] This is an oblique view showing retaining wall construction procedure 6, in which the retaining wall is nearing completion after multiple retaining wall blocks have been stacked. [Figure 17] This is an oblique view showing a retaining wall block with a bottom that is placed on the foundation block of this example. [Figure 18] This is a right side view showing construction procedure 4 of the retaining wall, showing the state in which a bottomed retaining wall block is placed on the foundation block of this example after crushed stone has been poured into the through hole. [Figure 19] This is a right side view showing retaining wall construction procedure 5, illustrating the state in which frame-structured retaining wall blocks are stacked on top of bottomed retaining wall blocks. [Figure 20] This is an oblique view showing retaining wall construction procedure 6, in which the retaining wall is nearing completion after multiple retaining wall blocks have been stacked on a bottomed retaining wall block. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, embodiments of the present invention will be described with reference to the drawings. The foundation 5 used in the retaining wall 8 of the present invention is formed on leveled ground 6 using, for example, flat foundation blocks 1 as shown in FIGS. 1 to 3, flat cover blocks 2 as shown in FIG. 4, and crushed stone 4 (see FIG. 10 and others below). The foundation 5 is constructed by stacking, for example, frame-structured retaining wall blocks 7 as shown in FIG. 5 on the upper surfaces 23 of the cover blocks 2 (see FIG. 16 below). In the retaining wall 8 of this example, the foundation blocks 1, cover blocks 2, and retaining wall blocks 7 are not connected to one another but are simply stacked on top of one another, and can be easily removed.

[0017] As shown in Figures 1-3, the foundation block 1 in this example is a flat concrete block with parallel upper and lower surfaces 16 and 17 that are rectangular in plan view and have a size that includes overhangs 14 (the boundary with the main body is shown by a dot-dash line) that protrude forward and backward beyond the area of ​​the retaining wall block 7. There are eight through holes 11 and 12 in this example. Four through holes 11, two on each side, are in the shape of a regular square pyramid with their central axes aligned vertically. Four through holes 12, two on each side, are sandwiched between the left and right through holes 11 and are in the shape of a square pyramid that is long in the front-to-back direction and their central axes aligned vertically. The openings that appear on the underside 17 of the through holes 11 and 12 extend to the overhangs 14 (see Figure 3).

[0018] In this example, the foundation block 1 has a total of four inserts 131 embedded in positions close to the left and right ends of the front and rear protrusions 14, and a bolt 13 is screwed into each insert 131, causing the bottom end of the bolt 13 to protrude downward. The bolt 13 is a height adjustment device that can adjust the amount of protrusion, and when placing the foundation block 1 on the ground 6 (see Figure 6 and subsequent figures), the bolt head is turned to adjust the distance between the bolt end and the surface of the ground 6. In this way, the foundation block 1 in this example is supported on the ground 6 by the four bolts 13 (see Figure 9).

[0019] The foundation block 1 in this example has four protrusions 15 at the four corners of the top surface 17a, located inward in the front-to-rear direction from the bolts 13, that fit into recesses 22 provided on the underside 24 of the cover block 2. The protrusions 15 and recesses 22 in this example are frustum-shaped, allowing them to fit together due to the transfer structure. By fitting the recesses 22 into the protrusions 15 of the foundation block 1, the cover block 2 is placed on the top surface 16 of the foundation block 1 while being positioned within the range of the retaining wall blocks sandwiched between the overhanging portions 14, preventing misalignment.

[0020] As shown in Figure 4, the cover block 2 in this example is a flat concrete block with parallel upper and lower surfaces 23 and 24 that is rectangular in plan view and is the same size as the foundation block 1 minus the front and rear overhangs 14 (see Figure 1). The entire lower surface 24 of the cover block 2 in this example is in contact with the upper surface 16 of the foundation block 1 minus the front and rear overhangs 14, so when placed on the foundation block 1, all of the through holes 11 and 12 in the foundation block 1 can be blocked. The upper surface 23 of the cover block 2 is equal in size to the lower frame 74 of the retaining wall block 7.

[0021] The cover block 2 of this example has recesses 22 at the four corners of its lower surface 24 that fit into the protrusions 15 provided on the upper surface 16 of the foundation block 1. The cover block 2 of this example also has protrusions 21 at the four corners of its upper surface 23 that fit into the recesses 72 provided on the lower frame 74 of the retaining wall block 7. The protrusions 21 and recesses 72 of this example are truncated cones that can fit together due to the transfer structure. The protrusions 21 and recesses 22 of this example are in the same position when viewed in a plan view. However, the protrusions 21 and recesses 22 do not have to be in the same position when viewed in a plan view.

[0022] As shown in Figure 5, the retaining wall block 7 in this example is a rectangular parallelepiped concrete block with parallel upper and lower frames 73 and 74 that are rectangular in plan view and are the same size as the foundation block 1 minus the front and rear projections 14. The retaining wall block 7 in this example has a hollow frame structure in which the open upper and lower frames 73 and 74 are connected. Although not shown in the figures, the retaining wall block 7 may have a hollow structure in which one or both of the upper and lower surfaces are closed, or a solid structure.

[0023] The retaining wall block 7 of this example has recesses 72 at the four corners of the lower frame 74 that fit into the protrusions 21 on the top surface 23 of the cover block 2. The retaining wall block 7 of this example also has protrusions 71 at the four corners of the upper frame 73 that fit into the recesses 72 on the lower frame 74 of the upper retaining wall block 7. The protrusions 71 and recesses 72 of this example are truncated cones that can fit together due to their transfer structure, and are in the same position in a plan view. Therefore, when the protrusions 71 of the lower retaining wall block 7 are fitted into the recesses 72 of the upper retaining wall block 7, the retaining wall blocks 7 can be stacked without misalignment.

[0024] An example of the construction procedure for the retaining wall 8 of this example will be described. The foundation 5 is formed on the leveled ground 6 without fixing the foundation blocks 1. First, as construction procedure 1, the foundation blocks 1 are placed on the leveled ground 6, as shown in Figures 6 and 7. In this example, before placing the foundation blocks 1 on the ground 6, metal plates 61 are placed to support the lower ends of the bolts 13, which serve as height adjustment devices. This allows the posture of the foundation block 1, which is supported by four bolts 13, to be adjusted by adjusting the amount of protrusion of the bolts 13 without having to sink each bolt 13 into the ground 6.

[0025] The ground 6 is leveled to a generally horizontal surface, but it does not have to be completely flat and horizontal; for example, as in this example, it may be uneven and slightly tilted in the front-to-back direction (the lower left in Figure 6 is the front, the upper right is the back, and the left is the front, the right is the back in Figure 7). For this reason, as shown in Figures 8 and 9 as construction procedure 2, the foundation block 1 of this example adjusts its posture by increasing or decreasing the protrusion amount of the bolts 13 that act as height adjusters, thereby absorbing the effects of unevenness and tilt of the ground 6. In this example, the bolts 13 located at the front protrude and the bolts 13 located at the rear retract, making the top surface 16 of the foundation block 1 horizontal.

[0026] In this way, with the foundation block 1 placed on the ground 6 and its top surface 16 level, crushed stone 4 is poured into each of the through-holes 11, 12 as shown in Figures 10 and 11 in construction procedure 3. Crushed stone 4 is poured into the gap between the bottom surface 17 of the foundation block 1 and the surface of the ground 6, and the excess is poured in until it spills out from the periphery of the foundation block 1. When the contoured surfaces of the crushed stone 4 piled up in the through-holes 11, 12 reach the openings of the top surfaces 16 of the through-holes 11, 12, the pouring is complete. Figures 9 and 10 show the state in which crushed stone 4 is in the middle of being poured into the right rear through-hole 12, and the others have been poured.

[0027] Once the poured crushed stone 4 reaches the openings of the top surface 16 of all of the through-holes 11, 12, the next step in construction step 4 is to place a flat lid block 2 on the foundation block 1 that has had crushed stone 4 poured into it through the through-holes 11, 12, as shown in Figures 12 and 13, thereby completing the foundation 5 consisting of the foundation block 1, lid block 2, and crushed stone 4. The lid block 2 can be placed in the correct position relative to the foundation block 1, with the left-right direction aligned and the overhang 14 remaining, by fitting the recess 22 on the underside 24 into the protrusion 15 on the top surface 16 of the foundation block 1. Furthermore, although the lid block 2 is simply placed on the foundation block 1, fitting the recess 22 into the protrusion 15 prevents it from shifting out of position.

[0028] In this example, the top surface 16 of the foundation block 1 and the bottom surface 24 of the cover block 2 are both flat, so when the cover block 2 is placed on the foundation block 1, the bottom surface 24 is in contact with the entire top surface 16 of the foundation block 1. This blocks all of the through holes 11, 12 in the foundation block 1, and the crushed stone 4 protruding from the openings of the through holes 11, 12 that appear on the top surface 16 is subjected to a downward force by the bottom surface 24 of the cover block 2. In this way, the crushed stone 4 is filled into the through holes 11, 12 so that it cannot move, and the crushed stone 4 pressed against the ground 6 prevents the foundation block 1 from moving.

[0029] As shown in Figures 14 and 15, in construction step 5, the retaining wall block 7 is placed on the top surface 23 of the cover block 2 placed on the foundation block 1. The top surface 23 and bottom surface 24 of the cover block 2 are parallel and flat. The position of the foundation block 1 is adjusted by the bolt 13, which serves as a height adjustment device, and the top surface 16 is kept horizontal, so the bottom surface 24 of the cover block 2, which comes into contact with the top surface 16 of the foundation block 1, and the top surface 23 of the cover block 2 are also horizontal. In this way, the retaining wall blocks 7 are stacked stably, using the top surface 23 of the cover block 2, which is horizontal, as a reference.

[0030] The foundation 5, which is made up of foundation blocks 1, cover blocks 2, and crushed stone 4, is arranged side by side in the left-right direction, and by stacking retaining wall blocks 7 on each cover block 2, a retaining wall 8 is constructed as shown in Figure 16, construction procedure 6. The retaining wall 8 in this example is constructed by placing cover blocks 2 of the same left-right width on each foundation block 1, and stacking retaining wall blocks 7 of the same left-right width directly above each cover block 2.

[0031] The foundation 5 can be made of a bottomed retaining wall block 3 instead of the flat lid block 2 of this example. As shown in Figure 17, the bottomed retaining wall block 3 is a rectangular parallelepiped with a hollow box-like structure, with the lower surface 34 closed by a bottom 35 and the upper surface open to form an upper frame 33. The bottomed retaining wall block 3 has four recesses 32 at the four corners of the lower surface 34 and four protrusions 31 at the four corners of the upper frame 33 directly above each recess 32, in the same positional relationship as the lid block 2 of this example (see Figure 4). The protrusions 31 are frustum-shaped, like the protrusions 21 of the lid block 2 of this example, and the recesses 32 are frustum-shaped, like the recesses 22 of the lid block 2 of this example.

[0032] As a result, by using a bottomed retaining wall block 3 instead of the cover block 2 of this example, and placing the bottomed retaining wall block 3 on the foundation block 1 after crushed stone 4 has been poured into it through the through holes 11, 12, as shown in Figure 18 as construction procedure 4, the foundation 5 can be formed from the foundation block 1, the bottomed retaining wall block 3, and the crushed stone 4. The bottomed retaining wall block 3 is a tall cover block 2, and by matching its height to the upper retaining wall block 7, it can be used as the lowest retaining wall block 3.

[0033] As shown in Figure 19, in construction step 5, the retaining wall blocks 7 are stacked on the upper frame 33 of the bottomed retaining wall blocks 3 placed on the foundation blocks 1. The bottomed retaining wall blocks 3 are flat surfaces with the copy plane (an imaginary plane surrounded by the upper frame 33) and the bottom surface 34 of the top frame 33 parallel to each other. If the top surface 16 of the foundation blocks 1 is horizontal, then the bottom surface 34 of the bottomed retaining wall blocks 3, which comes into contact with the top surface 16 of the foundation blocks 1, and the copy plane of the top frame 33 of the cover blocks 2 will also be horizontal. In this way, the retaining wall blocks 7 are stacked stably based on the top frame 33 of the bottomed retaining wall blocks 3, which form a horizontal copy plane.

[0034] A foundation 5 constructed from foundation blocks 1 and bottomed retaining wall blocks 3 is formed by pouring crushed stone 4 into the through-holes 11 of each foundation block 1 placed on the ground 6, and then covering the through-holes 11 with the undersides 34 of the bottomed retaining wall blocks 3 of another example. The foundations 5 thus formed are lined up in the left-right direction as shown in Figure 20 as construction procedure 6, and a retaining wall block 7 is stacked on each bottomed retaining wall block 3 to construct a retaining wall 8. The retaining wall 8 is constructed by placing a bottomed retaining wall block 3 of the same left-right width on each foundation block 1, and then stacking a retaining wall block 7 of the same left-right width directly above each bottomed retaining wall block 3.

[0035] A retaining wall 8 using lid blocks 2 and a retaining wall 8 using bottomed retaining wall blocks 3 differ in height by the difference in thickness between the lid blocks 2 and the bottomed retaining wall blocks 3. For example, if the bottomed retaining wall blocks 3 are the same thickness as the retaining wall blocks 7, the retaining wall 8 using the bottomed retaining wall blocks 3 will have approximately the same height as the retaining wall 8 using lid blocks 2 if only one retaining wall block 7 is stacked. In this way, the lid blocks 2 and the bottomed retaining wall blocks 3 are the same element in the present invention as elements that form the foundation 5, and by adjusting the number of stacked retaining wall blocks 7, retaining walls 8 of approximately the same height can be constructed. [Explanation of symbols]

[0036] 1 foundation block 11 Square pyramidal truncated through hole 12 Long, square-pyramid-shaped through-hole 13 Height adjustment bolt 131 Insert 14 Overhang 15 Conical truncated convex part 16 Top side 17 Bottom side 2 Flat lid block 21 Conical truncated convex part 22 Conical recess 23 Top side 24 Bottom side 3. Bottomed retaining wall blocks 31 Conical truncated convex part 32 Conical recess 33 Upper frame 34 Bottom side 35 bottom 4. Crushed Stone 5 Basics 6 Leveled ground 61 Metal plate 7 Frame structure retaining wall blocks 71 Conical truncated convex part 72 Conical recess 73 Upper Frame 74 Bottom frame 8. Retaining Wall

Claims

1. This is a retaining wall that takes a short time to form the foundation and stack the retaining wall blocks, and is easy to remove. A foundation block with multiple truncated cone-shaped through-holes penetrating from the top to the bottom is placed on the surface of the leveled ground, crushed stone is poured into each of the through-holes of the foundation block, and the through-holes of the foundation block are blocked by the underside of a cover block placed on the top of the foundation block, and the retaining wall blocks are stacked on top of the cover block to construct the structure. A retaining wall characterized by:

2. The foundation block has a convex portion on the top surface, The cover block has a recess on the underside that fits the protrusion of the base block. The retaining wall according to claim 1.

3. The lid block has a protrusion on the top surface, The bottom retaining wall block has a recess on the bottom surface or bottom frame to fit the protrusion of the cover block. The retaining wall according to claim 1.

4. The lower retaining wall blocks have a convex portion on the upper surface or upper frame, The upper retaining wall blocks have recesses on their undersides or bottom frames that fit the protrusions of the lower retaining wall blocks. The retaining wall according to claim 1.

5. The foundation blocks have height adjusters that can adjust the amount of protrusion, projecting toward the ground surface. A retaining wall according to any one of claims 1 to 4.

6. This is a retaining wall that takes a short time to form the foundation and stack the retaining wall blocks, and is easy to remove. A foundation block with multiple truncated cone-shaped through-holes penetrating from the top to the bottom is placed on the surface of the leveled ground, crushed stone is poured into each of the through-holes of the foundation block, and the through-holes of the foundation block are blocked by the underside of a bottomed retaining wall block placed on the top of the foundation block, and the construction is carried out by stacking the bottomed retaining wall blocks on top of the bottomed retaining wall blocks. A retaining wall characterized by:

7. The foundation block has a convex portion on the top surface, The bottom retaining wall block has a recess on the underside that fits the convex part of the foundation block. The retaining wall according to claim 6.

8. The lower retaining wall blocks have a convex portion on the upper surface or upper frame, The upper retaining wall blocks have recesses on their undersides or bottom frames that fit the protrusions of the lower retaining wall blocks. The retaining wall according to claim 6.

9. The foundation blocks have height adjusters that can adjust the amount of protrusion, projecting toward the ground surface. A retaining wall according to any one of claims 6 to 8.

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