Box-shaped retaining walls and retaining wall blocks

Abstract

To improve a landscape by covering upper end faces of counterfort plates and connecting plates of blocks for a retaining wall arranged at a bent portion of a box-shaped retaining wall with a granular filler so as not to be exposed on each step surface, and to enhance the meshing effect of the upper and lower granular fillers.SOLUTION: A block 11 for a retaining wall arranged at a bent portion of a box-shaped retaining wall is configured by including a surface plate 12, a counterfort plate 13, and two connecting plates 14. A lower end surface of the counterfort plate 13 and at least a lower end surface of a rear half of the connecting plate 14 are at the level of half the height of the surface plate 12. An upper end surface of the counterfort plate 13 and an upper end surface of the connecting plate 14 are lower than an upper end surface of the surface plate 12 by 40 to 150 mm.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a block used in a retaining wall and its bent portion. [Background technology]

[0002] As shown in Figures 12 and 13, the box-type retaining wall known from Patent Document 1 and the like is constructed by lining up multiple concrete retaining-wall blocks 51, each of which includes a surface plate 52, a back plate 53, and two tie plates 54 connecting them, horizontally, filling the space between the surface plate 52 and the back plate 53 with granular filler 59 such as single-grained crushed stone to form one stage, and stacking these stages from bottom to top in a staircase-like manner. Furthermore, if the box-type retaining wall has not only straight sections but also bent sections in plan view, the same retaining-wall blocks 51 as those in the straight sections are placed in the bent sections, upside down, as follows.

[0003] In the retaining wall block 51 arranged in the straight section of the box-shaped retaining wall, the upper end surface of the backing plate 53 and the upper end surface of at least the rear half of the connecting plate 54 are at half the height of the face plate 52, and the lower end surface of the backing plate 53 and the lower end surfaces of the connecting plates 54 are at the same height level as the lower end surface of the face plate 52.

[0004] The retaining wall blocks 51 arranged at the bends of the box-shaped retaining wall are the same as the retaining wall blocks 51 arranged at the straight sections, but turned upside down, so that the lower end surface of the backing plate 53 and the lower end surface of at least the rear half of the tie plate 54 are at half the height of the face plate 52, and the upper end surfaces of the backing plate 53 and tie plate 54 are at the same height as the upper end surface of the face plate 52. As a result, the lower end surface of the backing plate 53 or the lower end surface of the tie plate 54 rests on the upper end surface of the backing plate 53 or the upper end surface of the tie plate 54 of the retaining wall blocks 51 arranged at the straight sections, and is stable.

[0005] A box-type retaining wall does not have a structure that joins the retaining wall blocks 51 together horizontally or vertically, but is characterized by being a "flexible leaning-type retaining wall" in which the granular filler 59 that is filled and restrained in the spaces interlocks vertically and horizontally, allowing each retaining wall block 51 to move slightly but not significantly. During an earthquake, slight movement of the retaining wall blocks 51 is permitted, reducing the force applied to the retaining wall blocks 51 and preventing damage to the retaining wall blocks 51, and large movement of the retaining wall blocks 51 is prevented, maintaining the shape of the entire retaining wall.

[0006] In addition, the granular filler 59 appears on each step of the box-shaped retaining wall, creating a beautiful shaded look and improving the scenery. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2004-76343 A Summary of the Invention [Problem to be solved by the invention]

[0008] However, with the above-mentioned conventional box-type retaining wall, as shown in Figure 12(b), the upper end faces of the backing plates 53 and connecting plates 54 of the retaining wall blocks 51, which are arranged upside down at the bend, are exposed at each step, making the granular filler 59 look divided at each step, which has the problem of degrading the appearance.

[0009] Furthermore, as shown in Figure 13(a), when an inverted retaining wall block 51 is placed on the upper tier of retaining wall blocks 51 that are placed upside down at the bend, the upper end surface of the connecting plate 54 of the lower tier interferes with the lower end surface of the surface panel 52 of the upper tier, reducing the interlocking effect of the granular filler 59 of the upper and lower tiers. It is also possible to place a retaining wall block 51 that is not upside down on the upper tier of retaining wall blocks 51 that are upside down and placed at the bend, as shown in Figure 13(b) (arranging the upper tier symmetrically in Figure 12(a)). However, this type of arrangement is not preferred because the upper end faces of the backing plates 53 and connecting plates 54 of the lower tier will interfere with the lower end faces of the surface plates 52 and connecting plates 54 of the upper tier, further reducing the interlocking effect of the granular filler 59 of the upper and lower tiers.

[0010] Therefore, the object of the present invention is to cover the upper end faces of the backing plates and connecting plates of the retaining wall blocks arranged at the bends of the box-shaped retaining wall with granular filler so that they are not exposed on each step surface, making the granular filler appear continuous and uninterrupted on each step surface, thereby improving the appearance, and to prevent the retaining wall blocks on the upper and lower steps from interfering with each other, thereby improving the interlocking effect of the granular filler on the upper and lower steps. [Means for solving the problem]

[0011] [1] Retaining wall blocks A retaining wall block includes a standing surface plate, a support plate standing behind the surface plate and spaced apart from each other, and two connecting plates connecting the middle portions of the surface plate and the support plate in the left-right direction, and is disposed at a bent portion of a box-shaped retaining wall. The lower end surface of the back plate and the lower end surface of at least the rear half of the tie plate are at half the height of the top plate, A retaining wall block characterized in that the upper end surfaces of the supporting plate and the connecting plate are 40 to 150 mm lower than the upper end surface of the face plate.

[0012] [2] Box-type retaining wall A box-shaped retaining wall is constructed by arranging a plurality of retaining wall blocks horizontally, the retaining wall blocks including a plurality of steps stacked in a staircase shape, each step including an upright surface plate, a support plate standing at a distance from the rear of the surface plate, and two connecting plates connecting the left-right middle portions of the surface plate and the support plate, and filling the space behind the surface plate with granular filler. The first retaining wall block arranged on the straight portion of the box-shaped retaining wall has the upper end surface of the backing plate and the upper end surface of at least the rear half of the tie plate at half the height of the face plate, and the lower end surface of the backing plate and the lower end surface of the tie plate at the same height level as the lower end surface of the face plate, The second retaining wall block arranged at the bent portion of the box-shaped retaining wall has a lower end surface of the back plate and a lower end surface of at least the rear half of the tie plate at a level half the height of the face plate, and an upper end surface of the back plate and an upper end surface of the tie plate are 40 to 150 mm lower than the upper end surface of the face plate, A box-shaped retaining wall characterized in that the upper end surfaces of the backing plates and the connecting plates of the second retaining wall blocks are covered with granular filler material.

[0013] [Effect] The upper end faces of the backing plate and connecting plate of the second retaining wall block arranged at the bend are 40 to 150 mm lower than the upper end face of the face plate, so they are covered by the granular filler and are not exposed on each step surface. This improves the appearance as the granular filler appears continuous and uninterrupted on each step surface, and the upper and lower retaining wall blocks do not interfere with each other, improving the interlocking effect of the granular filler on the upper and lower steps. Effect of the Invention

[0014] According to the present invention, the upper end faces of the backing plates and connecting plates of the retaining wall blocks arranged at the bends of the box-shaped retaining wall are covered by granular filler and are not exposed on each step surface, so that the granular filler appears continuous and uninterrupted on each step surface, improving the appearance, and there is no interference between the retaining wall blocks on the upper and lower steps, thereby improving the interlocking effect of the granular filler on the upper and lower steps. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 shows a first retaining-wall block used in a box-type retaining wall of the first embodiment, where (a) is a perspective view seen from the front side, and (b) is a perspective view seen from the back side. [Diagram 2] FIG. 2 shows a second retaining wall block used in the embodiment, where (a) is a perspective view seen from the front side, and (b) is a perspective view seen from the back side. [Diagram 3] FIG. 3 shows the retaining wall blocks arranged in the first tier of the embodiment, where (a) is a perspective view seen from the front side, and (b) is a perspective view seen from the back side. [Figure 4] FIG. 4 is a perspective view showing a part (two stages) of the constructed embodiment. [Diagram 5] Figure 5 is a cross-sectional view taken along line VV in Figure 4, where (a) is a cross-sectional view of a second retaining wall block placed on top of a second retaining wall block, and (b) is a cross-sectional view of a first retaining wall block placed on top of the second retaining wall block. [Figure 6] FIG. 6 shows the retaining wall blocks arranged in the first tier of the second embodiment, where (a) is a perspective view seen from the front side, and (b) is a perspective view seen from the back side. [Figure 7] FIG. 7 is a perspective view showing a part (two stages) of the constructed embodiment. [Figure 8] FIG. 8 shows a second retaining wall block used in Example 3, where (a) is a perspective view seen from the front side, and (b) is a perspective view seen from the rear side. [Figure 9] FIG. 9 shows the retaining wall blocks arranged in the first tier of the embodiment, where (a) is a perspective view seen from the front side, and (b) is a perspective view seen from the back side. [Figure 10] FIG. 10 is a perspective view showing a part (two stages) of the constructed embodiment. [Figure 11] Figure 11 shows modified examples, where (a) is an oblique view from the rear side of a modified example of the second retaining wall block used in Examples 1 and 2, and (b) is an oblique view from the rear side of a modified example of the second retaining wall block used in Example 3. [Figure 12] FIG. 12 shows a conventional box-type retaining wall, where (a) is a perspective view of the retaining wall blocks arranged in the first tier, seen from the rear side, and (b) is a perspective view showing a portion of the constructed wall (two tiers). [Figure 13] Figure 13 is a cross-sectional view taken along line XIII-XIII in Figure 12, where (a) is a cross-sectional view of an inverted retaining wall block placed on top of an inverted retaining wall block, and (b) is a cross-sectional view of a non-inverted retaining wall block placed on top of an inverted retaining wall block. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] 1. Bend The bent portion may, for example, be in the following forms (1) and (2).

[0017] (1) The bent portion is one side end portion or the other side end portion that forms a corner of the box-shaped retaining wall (see Figs. 3 and 4 in Example 1). In this embodiment, the following embodiments (a) and (b) can be further exemplified. (a) An embodiment in which a second retaining wall block is arranged at the corresponding end of an upper tier of a second retaining wall block arranged at one end or the other end of a tier (see Figure 5 (a) of Example 1). (b) An embodiment in which a first retaining wall block is arranged at the corresponding end of an upper stage of a second retaining wall block arranged at one side end or the other side end of a certain stage (see Figure 5 (b) of Example 1).

[0018] (2) The bent portion is a chamfered portion formed diagonally between one end portion and the other end portion of the box-shaped retaining wall (see Figures 6 and 7 of Example 2, and Figures 9 and 10 of Example 3). In this embodiment, a second retaining-wall block is always placed at the corresponding end of the upper step of a second retaining-wall block placed in the chamfered portion of a certain step.

[0019] 2. Second retaining wall blocks The amount by which the upper end faces of the backing plates and connecting plates of the second retaining wall blocks are lower than the upper end face of the face plate is 40 to 150 mm as described above, more preferably 60 to 130 mm, and most preferably 80 to 120 mm. Furthermore, with regard to the upper end surface of the connecting plate of the second retaining wall block, it is preferable that the entire upper end surface is 40 to 150 mm lower than the upper end surface of the face plate, but the present invention also includes an upper end surface other than the front end portion which is 40 to 150 mm lower than the upper end surface of the face plate and where the front end portion (within the front-to-rear length range of 40 to 150 mm) is increased in height and connected to the face plate (see Figure 11 for a modified example).

[0020] 3. Granular filler The granular filler is not particularly limited, but examples thereof include crushed stone, granular stone, etc., and single-grain crushed stone is preferable. More specifically, the following can be exemplified. ·Crushed stone for roads: JIS A5001-2008, S-30 (No. 4) 30~20mm, S-40 (No. 3) 40~30mm, S-60 (No. 2) 60~40mm Crushed stone for concrete: JIS A5005-2009, Crushed stone 4020 - Cracked stone: JIS A5006-1995, grain size 50~150mm EXAMPLES

[0021] Next, an embodiment of the present invention will be described with reference to the drawings. Note that the structure and the shape and dimensions of each part of the embodiment are merely examples and can be modified as appropriate without departing from the spirit and scope of the invention.

[0022] [Example 1] 1 to 5 show a first embodiment, and the box-shaped retaining wall of this embodiment is made up of a plurality of steps z1, z2 piled up in a staircase shape as shown in FIG.

[0023] Each stage z1, z2 is constructed from two types of retaining wall blocks 1, 11, namely, first retaining wall blocks 1 arranged horizontally along a straight line in a plan view of the box-type retaining wall, and second retaining wall blocks 11 arranged at a bent portion in a plan view of the box-type retaining wall, and granular filler 9 filled in the spaces between all of the retaining wall blocks 1, 11. The bent portion in this embodiment is the other edge portion that forms a corner in a plan view of the box-type retaining wall (this point will be described further below).

[0024] As shown in Figure 1, the first retaining wall block 1 is composed of an upright surface panel 2, a supporting plate 3 standing at a distance from the rear of the surface panel 2, and two connecting plates 4 connecting the left-right middle portion of the surface panel 2 and the left-right middle portion of the supporting plate 3, which are precast integrally from concrete.

[0025] The front panel 2 is a rectangular plate with a left-right length of approximately 2000 mm, a top-bottom length of approximately 1000 mm, and a thickness of approximately 120 mm. Its surface is provided with a pattern such as a stone wall pattern or a groove pattern, and drainage recesses 5 are formed at the upper and lower parts of the left and right side end faces. The support plate 3 is a rectangular plate having a left-right length of approximately 1,860 mm, a top-bottom length of approximately 500 mm, and a thickness of approximately 120 to 140 mm. The connecting plate 4 is a plate with a thickness of about 100 mm, with a front-to-back length of about 1000 mm, a vertical length of about 500 mm at at least the rear part 4a (within a front-to-back length of about 660 mm) including the rear half, a front part 4b (within a front-to-back length of about 240 mm) continuing in front of the rear part 4a and increasing upward to a vertical length of about 900 mm, and a front end part 4c (within a front-to-back length of 100 mm) continuing in front of the front part 4b and increasing obliquely upward to connect to the upper end of the top plate 2. The boundary between the rear part 4a, the front part 4b and the front end part 4c is indicated by a dashed line. Therefore, the upper end surface of the backing plate 3 and at least the rear upper end surface of the connecting plate 4 are at a level that is 1 / 2 the height of the front panel 2, and the lower end surface of the backing plate 3 and the lower end surface of the connecting plate 4 are at the same height level as the lower end surface of the front panel 2.

[0026] The outer surface of each tie plate 4 is located approximately 390 mm inward from each side end face of the front plate 2, and the inner surfaces of both tie plates 4 face each other parallel to each other with a mutual distance of approximately 1,010 mm. Therefore, between the front plate 2 and the back plate 3, there is a central void and left and right side recesses. In addition, there is a rear void behind the back plate 3 (between it and the slope not shown).

[0027] As shown in Figure 2, the second retaining wall block 11 is composed of an upright surface panel 12, a supporting plate 13 standing at a distance from the rear of the surface panel 12, and two connecting plates 14 connecting the left-right middle portion of the surface panel 2 and the left-right middle portion of the supporting plate 13, all of which are precast integrally from concrete.

[0028] The front panel 12 is a rectangular plate with a left-right length of approximately 2000 mm, a top-bottom length of approximately 1000 mm, and a thickness of approximately 120 mm. Its surface is provided with a pattern such as a stone wall pattern or a groove pattern, and drainage recesses 15 are formed at the upper and lower parts of the left and right side end faces. The support plate 13 is a rectangular plate having a left-right length of approximately 1860 mm, a top-bottom length of approximately 500 mm, and a thickness of approximately 120 to 140 mm. The connecting plate 14 is a plate with a thickness of about 100 mm, with a front-to-back length of about 1000 mm, a vertical length of about 500 mm at at least the rear part 14a (within a front-to-back length of about 660 mm) including the rear half, a vertical length of about 900 mm at a front part 14b (within a front-to-back length of about 240 mm) continuing in front of the rear part 14a, and a front end part 14c (within a front-to-back length of 100 mm) continuing in front of the front part 14b, which increases diagonally downward and connects to the lower end of the top plate 12. The boundary between the rear part 14a, the front part 14b, and the front end part 14c is indicated by a dashed line. Therefore, the lower end surface of the backing plate 13 and at least the rear lower end surface of the connecting plate 14 are at a level that is half the height of the front plate 12, and the upper end surfaces of the backing plate 13 and the connecting plate 14 are approximately 100 mm lower than the upper end surface of the front plate 12.

[0029] The outer surface of each tie plate 14 is located approximately 390 mm inward from each side end face of the front plate 12, and the inner surfaces of both tie plates 14 face each other parallel to each other with a mutual distance of approximately 1,010 mm. Therefore, between the front plate 12 and the back plate 13, there is a central void and left and right side recesses. In addition, there is a rear void behind the back plate 13 (between it and the slope not shown).

[0030] The box-type retaining wall of this embodiment is constructed as follows. As shown in FIG. 3, in row z1, the retaining wall blocks 1, 11 are arranged so that one side (right side in (a) and left side in (b)) and the other side (left side in (a) and right side in (b)) form a corner of approximately 90 degrees between their ends. In detail, a plurality of first retaining wall blocks 1 are arranged along the straight line of one side. Next, a plurality of first retaining wall blocks 1 are arranged along the straight line of the other side, except that second retaining wall blocks 11 are arranged only at the end of the other side as a bent part. This second retaining wall block 11 is stabilized by the lower end surface of the backing plate 13 or the lower end surface of the tie plate 14 resting on the upper end surface of the backing plate 13 or the upper end surface of the tie plate 14 of the first retaining wall block 1 arranged at the end of one side.

[0031] Next, granular filler 9 (for example, single-grained crushed stone S-40 (No. 3)) is filled into the spaces (the central space, side recesses and rear space) behind the face plates 1, 12 of all the retaining wall blocks 1, 11 to form a step z1. At this time, as shown in the lower part of Fig. 4 and the lower part of Fig. 5(a), the upper end face of the connecting plate 14 of the second retaining wall block 11 is covered by the granular filler 9 and is not exposed.

[0032] Next, the step z2 is formed in the same manner as the step z1, but at a distance of 100 mm or more from the step z1.

[0033] (a) As shown in Figure 5(a), a second retaining wall block 11 of step z2 is arranged at the corresponding end of the upper step of a second retaining wall block 11 arranged at the other end of step z1. At this time, the upper end surfaces of the connecting plates 14 of stage z1 are covered by the granular filler 9 and do not interfere with the lower end surface of the surface panel 12 of stage z2, so that the interlocking effect of the granular filler 9 of the upper and lower stages is improved compared to the conventional example of Figure 13(a) described above.

[0034] (b) As shown in Figure 5(b), a first retaining wall block 1 of step z2 is arranged at the corresponding end of the upper section of a second retaining wall block 11 arranged at the other end of step z1. In this case, the upper end faces of the backing plate 13 and connecting plate 14 of stage z1 are covered with granular filler 9 and do not interfere with the lower end faces of the front plate 2 and connecting plate 4 of stage z2. As a result, the interlocking effect of the granular filler 9 of the upper and lower stages is improved compared to the conventional example of Figure 13(b) described above, and this embodiment can be implemented without any particular problems.

[0035] Furthermore, the third and subsequent stages (not shown) are formed in the same manner as stage z2 until a desired height is reached, thereby constructing a box-shaped retaining wall.

[0036] In Example 1 constructed as described above, the upper end faces of the connecting plates 14 of the second retaining wall blocks 11 are not exposed at each step, so that the granular filler 9 appears continuous and uninterrupted, improving the appearance.

[0037] [Example 2] The box-type retaining wall of Example 2 shown in Figures 6 and 7 differs from Example 1 in that the bent portion is a chamfered portion formed diagonally between one end portion and the other end portion of the box-type retaining wall.

[0038] As shown in Fig. 6, in step z1, the first retaining wall blocks 1 are arranged on one side and the other side up to the ends of those sides. Next, the second retaining wall blocks 11 are arranged on the chamfered portions. The lower end faces of the backing plates 13 or the lower end faces of the tie plates 14 of the second retaining wall blocks 11 are stabilized by resting on the upper end faces of the backing plates 3 or the upper end faces of the tie plates 4 of the first retaining wall blocks 1 arranged on the ends of one side and the other side.

[0039] Next, in the same manner as in the first embodiment, the granular filler 9 is filled into the spaces between all the retaining wall blocks 1 and 11 to form a step z1. Next, step z2 is formed in the same manner as step z1, but set back by 100 mm or more from step z1. The second retaining wall block 11 of step z2 is always placed at the corresponding end of the upper step of the second retaining wall block 11 placed in the chamfered portion of step z1. Furthermore, the third and subsequent stages (not shown) are formed in the same manner as stage z2 until a desired height is reached, thereby constructing a box-shaped retaining wall.

[0040] The second embodiment also provides the same effects as the first embodiment.

[0041] [Example 3] The box-shaped retaining wall of Example 3 shown in Figs. 8 to 10 differs from Example 2 in that the left-right length of the second retaining-wall block 11 is shortened.

[0042] That is, the front panel 12 is shortened to approximately 1500 mm in left-right length, the back panel 13 is shortened to approximately 1260 mm in left-right length, the distance between the inner faces of both connecting panels 14 is shortened to approximately 380 mm, and other dimensions remain almost unchanged.

[0043] The third embodiment is constructed in the same manner as the second embodiment, and provides the same effects and advantages.

[0044] [Example of change] FIG. 11(a) shows a modified example of the second retaining-wall block 11 used in the first and second embodiments, and FIG. 11(b) shows a modified example of the second retaining-wall block 11 used in the third embodiment. The only difference between these is that the front end 14c of the connecting plate 14 (within a range of approximately 100 mm in front-to-back length) is lengthened obliquely upward and joined to the upper end of the surface plate.

[0045] Even if these modified examples are used in the above-mentioned embodiment, the upper end face of the tie plate 14 is covered with the granular filler and is not exposed, so that the same functional effects can be obtained.

[0046] The present invention is not limited to the above-described embodiment, and can be embodied by making appropriate modifications without departing from the gist of the invention. [Explanation of symbols]

[0047] 1. First retaining wall block 2 Surface plate 3 Backboard 4. Connecting board 4a Rear 4b Front 4c Front end 5 Water drain recess 9 Granular filler 11 Second retaining wall block 12 Surface plate 13 Backboard 14 Connecting board 14a Rear 14b front 14c Front end 15 Water drainage recess z1 stage z2 steps

Claims

1. A retaining wall block (11) includes an upright surface plate (12), a support plate (13) standing at a distance from the rear of the surface plate (12), and two connecting plates (14) connecting the left-right middle portions of the surface plate (12) and the support plate (13), and is disposed at a bent portion of a box-shaped retaining wall. The surface plate (12), the back plate (13), and the two connecting plates (14) are integrally precast with concrete. The lower end surface of the support plate (13) and the lower end surface of at least the rear half of the connecting plate (14) are at half the height of the surface plate (12); The retaining wall block is characterized in that the upper end surface of the backing plate (13) and the upper end surface of the connecting plate (14) are 40 to 150 mm lower than the upper end surface of the surface plate (12).

2. A box-shaped retaining wall is constructed by arranging a plurality of retaining wall blocks (1, 11) in the horizontal direction, the retaining wall blocks (1, 11) including a plurality of steps (z1, z2) stacked in a staircase-like manner, each step (z1, z2) including an upright surface plate (2, 12), a back plate (3, 13) standing at a distance behind the surface plate (2, 12), and two connecting plates (4, 14) connecting the left-right middle portions of the surface plate (2, 12) and the back plate (3, 13), and filling a granular filler (9) in a space behind the surface plate (2, 12), The first retaining wall block (1) arranged in the straight portion of the box-shaped retaining wall has an upper end surface of the back plate (3) and an upper end surface of at least the rear half of the tie plate (4) at a level half the height of the face plate (2), and a lower end surface of the back plate (3) and a lower end surface of the tie plate (4) at the same height level as the lower end surface of the face plate (2); The second retaining wall block (11) arranged at the bent portion of the box-shaped retaining wall has a lower end surface of the back plate (13) and a lower end surface of at least the rear half of the tie plate (14) at a level half the height of the face plate (12), and an upper end surface of the back plate (13) and an upper end surface of the tie plate (14) are 40 to 150 mm lower than the upper end surface of the face plate (12); A box-shaped retaining wall characterized in that the upper end surface of the backing plate (13) and the upper end surface of the connecting plate (14) of the second retaining wall block (11) are covered with granular filler material (9).

3. 3. A box-type retaining wall according to claim 2, wherein the bent portion is one side end portion or the other side end portion that forms a corner portion of the box-type retaining wall.

4. 4. A box-shaped retaining wall as described in claim 3, wherein a second retaining wall block (11) is arranged at the corresponding end of the upper stage of a second retaining wall block (11) arranged at one side end or the other side end of a certain stage.

5. 4. A box-shaped retaining wall as described in claim 3, in which a first retaining wall block (1) is arranged at the corresponding end of the upper stage of a second retaining wall block (11) arranged at one side end or the other side end of a certain stage.

6. 3. The box-shaped retaining wall according to claim 2, wherein the bent portion is a chamfered portion formed obliquely between one end portion and the other end portion of the box-shaped retaining wall.

Images