JP2018193785A - Block and retaining wall - Google Patents

Abstract

To provide a block for a retaining wall and a retaining wall which can be easily constructed compared with conventional ones.SOLUTION: A block includes: a first protrusion 12 protruding downwardly from a back face 11a side portion and disposed at a back face 11a side of a block 10 stacked below; a second protrusion 13a protruding downwardly from a left side portion when viewed from a front face 11b side between the first protrusion 12 and the front face 11b; a third protrusion 13b protruding downwardly from a right side portion when viewed from the front face 11b side between the first protrusion 12 and the front face 11b; and a recess 14 formed on an upper side portion and housing a second protrusion 13a of the block 10 stacked on an upper right viewed from the front face 11b side and a third protrusion 13b of the block 10 stacked on an upper left viewed from the front face 11b side.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a block forming a part of a retaining wall and a retaining wall having the block.

  Conventionally, a concrete block for retaining walls has been proposed for the purpose of making it possible to easily construct the retaining wall (Patent Document 1).

JP-A-9-203058

  However, according to the concrete block for retaining walls described in Patent Document 1, insert materials such as chestnut, crushed stone, earth and sand must be put into the space inside the concrete block for retaining walls, and the equipment and labor for that purpose. Is required.

  In view of such a problem, an object of the present invention is to provide a retaining wall block and a retaining wall that can be constructed more easily than before.

In order to solve the above problems, the block of the present invention is:
The back side facing the soil side,
A front side opposite to the back side,
A block that forms a retaining wall by stacking a plurality in a staggered pattern when viewed from the front side,
A first convex portion that protrudes downward from the back side portion and is disposed on the back side of the block stacked below;
Between the first convex portion and the front surface, a second convex portion protruding downward from the left side portion when viewed from the front side;
Between the first convex portion and the front surface, a third convex portion protruding downward from the right side portion as viewed from the front side;
The second convex part of the block that is formed in the upper part and is stacked on the upper right side when viewed from the front side, and the third convex part of the block that is stacked on the upper left side when viewed from the front side are accommodated. And a recess.

  ADVANTAGE OF THE INVENTION According to this invention, the block and retaining wall for retaining walls which can be constructed more easily than before can be provided.

The standard block which concerns on 1st Embodiment of this application is shown. (A) is a top view, (b) is a side view. The standard block and plate-shaped member which concern on 1st Embodiment of this application are shown. (A) is a top view, (b) is a side view. The top block concerning the 1st embodiment of this application is shown. (A) is a top view, (b) is a side view. The basic block which concerns on 1st Embodiment of this application is shown. (A) is a top view, (b) is a side view. The left end block concerning 1st Embodiment of this application is shown. (A) is a top view, (b) is a side view. The right end block concerning 1st Embodiment of this application is shown. (A) is a top view, (b) is a side view. The left top end block which concerns on 1st Embodiment of this application is shown. (A) is a top view, (b) is a side view. The right top end block which concerns on 1st Embodiment of this application is shown. (A) is a top view, (b) is a side view. It is a top view which shows a part of retaining wall which concerns on 1st Embodiment of this application. It is a side view of the retaining wall which concerns on 1st Embodiment of this application. It is a top view of the retaining wall which concerns on 1st Embodiment of this application. (A) shows the retaining wall with the center of curvature on the front side in plan view, and (b) shows the retaining wall with the center of curvature on the back side in plan view. The standard block which concerns on 2nd Embodiment of this application is shown. (A) is a top view, (b) is a side view. The basic block which concerns on 2nd Embodiment of this application is shown. (A) is a top view, (b) is a side view. It is a side view of the retaining wall which concerns on 2nd Embodiment of this application. It is a front view of the retaining wall which concerns on 2nd Embodiment of this application.

(First embodiment)
Hereinafter, a first embodiment of the present application will be described with reference to the drawings. FIG. 1 shows a standard block 10 according to the first embodiment of the present application. (A) is a top view, (b) is a side view. In FIG. 1A, the right side is the back side facing the soil, and the left side is the front side of the retaining wall. Unless otherwise specified, the side that is visible to the right when the standard block 10 is viewed from the front side (left side of the drawing) is the right side of the standard block 10, and the side that is visible to the left is the left side of the standard block 10. The same applies to the description after FIG. Hereinafter, a plurality of types of blocks will be described, but these blocks may be simply referred to as “blocks” as a generic term.

  The standard block (block) 10 includes a main body 11, a first convex portion 12 that protrudes downward from the rear surface 11 a side portion of the main body 11 and is formed over the entire length of the left and right, and between the first convex portion 12 and the front surface 11 b. A second protrusion 13a that protrudes downward from the left side portion when viewed from the front surface 11b side, and a third protrusion that protrudes downward from the right portion when viewed from the front surface 11b side between the first protrusion 12 and the front surface 11b. And a convex portion 13b.

  The main body 11 has a substantially rectangular parallelepiped shape whose dimensions increase in the order of the vertical direction, the horizontal direction, and the depth direction. The main body 11 has a tapered shape as it goes from the front surface 11b side to the back surface 11a side, and has a trapezoidal shape in plan view.

  The first convex portion 12 has a rectangular column shape that is long in the left-right direction. The first convex portion 12 has a surface on the same plane as the back surface 11a of the main body 11 on the back side, a surface on the same plane as the left side surface 11c of the main body 11, and the right side. The main body 11 has a surface on the same plane as the right side surface 1d.

  The 2nd convex part 13a and the 3rd convex part 13b are arrange | positioned at the substantially equal distance from the back surface 11a. Moreover, the 2nd convex part 13a and the 3rd convex part 13b are arrange | positioned at the substantially equal distance from the front surface 11b. The second convex portion 13a has a rectangular parallelepiped shape, and has a surface on the same plane as the left side surface 11c of the main body 11 on the left side. The third convex portion 13b has a rectangular parallelepiped shape, and has a surface on the same plane as the right side surface 11d of the main body 11 on the right side.

  On the upper part of the main body 11, a second convex portion 13a of the standard block 10 stacked on the upper right side when viewed from the front surface 11b side, and a third convex portion 13b of the standard block 10 stacked on the upper left side when viewed from the front surface 11b side. A recess 14 is formed in which is accommodated. The concave portion 14 is formed in a rectangular parallelepiped shape whose inner space is long in the left-right direction. The concave portion 14 has a dimension that forms a gap around the second and third convex portions 13a and 13b to be accommodated. The concave portion 14 is arranged between the first convex portion 12 and the second and third convex portions 13a and 13b in the substantially central direction in the left-right direction and in the depth direction when viewed from the front surface 11b side.

  As for the 1st convex part 12, seeing from the front 11b side, the suction prevention sheet | seat 15 is attached to the front 11b side part of the approximate center of the left-right direction. The suction prevention sheet 15 has a band shape, and the surface on the back surface 11 a side of the upper end portion is attached to the surface on the front surface 11 b side of the first convex portion 12.

  An eyebolt embedded nut 16 is embedded in the upper center of the main body 11. Thereby, the standard block 10 can be easily lifted by attaching an eyebolt during transportation or construction.

  FIG. 2 shows the standard block 10 and the plate member 17 according to the first embodiment of the present application. (A) is a top view, (b) is a side view.

  The plate member 17 is a plate member that is long in the left-right direction. The plate-like member 17 can be formed from, for example, hard plastic. The plate-like member 17 is interposed between the upper and lower standard blocks 10 on the back surface 11a side as needed, and is used to adjust the angle of the upper and lower standard blocks 10.

  FIG. 3 shows the top end block 20 according to the first embodiment of the present application. (A) is a top view, (b) is a side view.

  The top block 20 has a main body 21, a first convex portion 22, a second convex portion 23a, a third convex portion 23b, a suction prevention sheet 25, and an eyebolt embedded nut 26. The same as the standard block 10 in FIG. On the other hand, unlike the standard block 10, the top end block 20 does not have the recess 14 formed in the upper part of the standard block 10.

  FIG. 4 shows a basic block 30 according to the first embodiment of the present application. (A) is a top view, (b) is a side view.

  The base block 30 has substantially the same planar shape as the standard block 10 and has a recess 34 and an eyebolt embedded nut 36 at the top. The concave portion 34 accommodates the second convex portion 13a of the standard block 10 stacked at the upper right when viewed from the front 31b side and the third convex portion 13b of the standard block 10 stacked at the upper left when viewed from the front 31b side. . The recess 34 forms a rectangular parallelepiped space that is long in the left-right direction. The recessed part 34 has a dimension that forms a gap around the accommodated second and third protruding parts 13a and 13b.

  The back surface 31a and the front surface 31b of the foundation block 30 are arranged in a direction substantially perpendicular to the top surface 31c and are formed in a planar shape. The front surface 31b extends downward larger than the back surface 31a. The lower surface 31d is formed in a rectangular planar shape that is substantially parallel to the upper surface 31c from the lower end of the front surface 31b to the rear surface 31a side and is long on the left and right. The lower surface 31d has a shorter dimension than the upper surface 31c in the depth direction viewed from the front surface 31b. The inclined surface 31e is formed in a rectangular flat shape between the lower surface 31d side end of the lower surface 31d and the lower end of the rear surface 31a. The through hole 38 is formed substantially perpendicular to the front surface 31b from the front surface 31b to the inclined surface 31e.

  FIG. 5 shows the left end block 40 according to the first embodiment of the present application. (A) is a top view, (b) is a side view.

  The left end block 40 is shaped such that the left half of the standard block 10 is removed. Specifically, the left end block 40 includes a main body 41 that is long in the depth direction when viewed from the front surface 41b side, a first convex portion 42 that protrudes downward from the back surface 41a side portion of the main body 41 over the entire length in the left-right direction, Between the first convex portion 42 and the front surface 41b, there is a second convex portion 43 that protrudes downward from the right side portion when viewed from the front surface 41b side. The upper part of the main body 41 is formed with a concave portion 44 in which the second convex portion 13a of the standard block 10 stacked on top or the second convex portion 23a of the top end block 20 stacked on top is accommodated. . The concave portion 44 forms a rectangular parallelepiped space opened on the left side thereof. An eyebolt embedded nut 46 is embedded in the upper center of the main body 41.

  FIG. 6 shows the right end block 50 according to the first embodiment of the present application. (A) is a top view, (b) is a side view.

  The right end block 50 is shaped such that the right half of the standard block 10 is removed. Specifically, the right end block 50 includes a main body 51 that is long in the depth direction when viewed from the front 51b side, a first convex portion 52 that protrudes downward over the entire length in the left-right direction on the back surface 51a side portion of the main body 51, and Between the first convex portion 52 and the front surface 51b, there is a second convex portion 53 protruding downward from the right side portion when viewed from the front surface 51b side. In the upper part of the main body 51, a third convex portion 13b of the standard block 10 stacked on top or a concave portion 54 for accommodating the third convex portion 23b of the top end block 20 stacked on top is formed. . The concave portion 54 forms a rectangular parallelepiped space opened on the right side. An eyebolt embedded nut 56 is embedded in the upper center of the main body 51.

  FIG. 7 shows the left top end block 60 according to the first embodiment of the present application. (A) is a top view, (b) is a side view.

  The left top end block 60 is shaped like the left end block 40 without the recess 44. Specifically, the left top end block 60 includes a main body 61 that is long in the depth direction when viewed from the front surface 61b side, and a first convex portion 62 that protrudes downward over the entire length in the left-right direction at the back surface 61a side portion of the main body 61. The first convex portion 62 and the front surface 61b have a second convex portion 63 that protrudes downward from the right side portion when viewed from the front surface 61b side. An eyebolt embedded nut 66 is embedded in the upper center of the main body 61.

  FIG. 8 shows the right top end block 70 according to the first embodiment of the present application. (A) is a top view, (b) is a side view.

  The right top end block 70 is shaped like the right end block 50 without the recess 54. Specifically, the right ceiling block 70 includes a main body 71 that is long in the depth direction when viewed from the front surface 71b side, and a first convex portion 72 that protrudes downward over the entire length in the left-right direction at the back surface 71a side portion of the main body 71. The first convex portion 72 and the front surface 71b have a second convex portion 73 that protrudes downward from the right side portion when viewed from the front surface 71b side. An eyebolt embedding nut 76 is embedded in the upper center of the main body 71.

  FIG. 9 is a plan view showing a part of the retaining wall 100 according to the first embodiment of the present application. In FIG. 9, the upper part of the block stacked on the upper side is indicated by a solid line, the lower part of the block stacked on the upper side is indicated by a broken line, and the upper part of the block stacked on the upper side is indicated by a dotted line.

  The retaining wall 100 is formed by stacking the above blocks in a zigzag shape when viewed from the front side. As shown in FIG. 9, most of the retaining wall 100 is configured by arranging a plurality of standard blocks 10 in the left-right direction and then stacking a plurality of standard blocks 10 by shifting the standard blocks 10 in the left-right direction. The 2nd convex part 13a and the 3rd convex part 13b of the standard block 10 piled on are accommodated in the recessed part 14 of the standard block 10 arrange | positioned under it. Accordingly, the standard blocks 10 stacked vertically are constrained so as not to move in the left-right direction. The same applies to blocks other than the standard block 10.

  When the standard blocks 10 are shifted by half as described above and stacked in a staggered manner as described above, the number of standard blocks 10 is one less than the number of lower blocks at every other stage, and the standard blocks are formed at the left and right ends of the retaining wall 100. Half of the space will remain. The left end block 40 or the right end block 50 is arranged in the space. The second convex portion 43 of the left end block 40 is accommodated in the concave portion 14 of the standard block 10 disposed below. The second convex portion 53 of the right end block 50 is accommodated in the concave portion 14 of the standard block 10 disposed below.

  FIG. 10 is a side view of the retaining wall 100 according to the first embodiment of the present application.

  As shown in FIG. 10, the retaining wall 100 is constructed between the ground GL1 and the ground GL2 located at a position higher than the ground GL1. The lowermost part (lowermost stage) of the retaining wall 100 is configured by arranging a plurality of foundation blocks 30 in the left-right direction. The foundation block 30 is disposed so as to be inclined so that the back side is lowered. The foundation block 30 is fixed to the ground by reinforcing bar insertion by the reinforcing bar 101 through the through hole 38.

  The standard block 10, the right end block 50, and the top end block 20 are stacked while being shifted little by little to the back side. The first convex portion 12 of the standard block 10, the first convex portion 52 of the right end block 50, and the first convex portion 22 of the top end block 20 are disposed on the back side of the block disposed below. . Thereby, each block opposes the earth pressure from the soil on the back side, and is restrained so as not to move to the front side. The same applies to the left end block 40. In the first embodiment shown in FIG. 10, the uppermost stage is composed of only the top end block 20. However, when the retaining wall 100 is configured so that the number of the top end blocks 20 is one less than the standard block 10 disposed immediately below it, the left end of the uppermost stage of the retaining wall 100 The left top end block 60 is arranged, and the right top end block 70 is arranged at the upper right end. Also in this case, the first convex portion 62 of the left top end block 60 and the first convex portion 72 of the right top end block 70 are arranged on the back side of the lower standard block 10.

  The suction prevention sheet 15 of the standard block 10 and the suction prevention sheet 25 of the top end block 20 are arranged between the gap between adjacent blocks arranged in the immediately lower stage and the soil on the back side. The suction prevention sheets 15 and 25 prevent the soil from being discharged to the front side of the retaining wall 100.

  In FIG. 10, the indicating line FL is indicated by a one-dot chain line. The indicating line FL is a trajectory drawn by a passing point of the resultant force of the dead weight of the retaining wall 100 and the earth pressure from the soil behind the retaining wall 100. The retaining wall 100 does not fall unless the indicating line FL is detached from the retaining wall 100. In the retaining wall 100, the plate-like member 17 shown in FIG. 2 is arranged between the upper and lower blocks, and the upper part of the retaining wall 100 is warped up. Thereby, the shape of the retaining wall 100 is brought close to the curved shape of the indicating line FL so that the indicating line FL does not come off the retaining wall 100.

  FIG. 11 is a plan view of the retaining wall 100 according to the first embodiment of the present application. (A) shows the retaining wall 100 whose center of curvature is on the front side in plan view, and (b) shows the retaining wall 100 whose center of curvature is on the back side in plan view.

  As shown in FIG. 11, the retaining wall 100 according to the first embodiment of the present application can be configured in a curved shape in a plan view. In FIG. 11, the retaining wall 100 has an arc shape, but may be formed in a meandering curved shape.

(Second Embodiment)
Next, a second embodiment of the present application will be described with reference to the drawings. In the second embodiment, description of the same points as in the first embodiment will be omitted as appropriate, and differences from the first embodiment will be mainly described. The reference numerals indicating the respective parts of the blocks according to the second embodiment use the numerical reference numerals obtained by adding “200” to the reference numerals used in the first embodiment. For example, the part of 2nd Embodiment corresponding to the main body 11 of 1st Embodiment is attached | subjected the code | symbol "211". Hereinafter, a plurality of types of blocks will be described, but these blocks may be simply referred to as “blocks” as a generic term.

  FIG. 12 shows a standard block 210 according to the second embodiment of the present application. (A) is a top view, (b) is a side view. The right side is the back side facing the soil toward the drawing of (a), and the left side is the front side of the retaining wall 100. Unless otherwise specified, the side that is visible to the right when the standard block 210 is viewed from the front side (left side of the drawing) is the right side of the standard block 210, and the side that is visible to the left is the left side of the standard block 210. The same applies to the description after FIG.

  In the standard block 210 of the second embodiment, unlike the standard block 10 of the first embodiment, the dimensions of the main body 211 in the height direction are the same as those in the left-right direction. Further, the corner portion on the front surface 211b side of the main body 211 is chamfered, and a chamfered portion 211e and a chamfered portion 211f are formed.

  FIG. 13 shows a basic block 230 according to the second embodiment of the present application. (A) is a top view, (b) is a side view.

  Unlike the basic block 30 of the first embodiment, the basic block 230 according to the second embodiment has a plate-like main body 231 having a long dimension in the depth direction when viewed from the front surface 231b side. The main body 231 has side surfaces 231f and 231g formed so that the width in the left-right direction becomes narrower from the front surface 231b side to the back surface 231a side in a plan view. Like the standard block 210, chamfered portions 231h and 231i are formed on the front surface 231b side of the main body 231.

  A first inclined surface 231k that is inclined so that the front surface 231b side is lowered is formed on the upper portion of the main body 231 on the front surface 231b side. A step portion 231j is formed on the back surface 231a side of the main body 231. The step portion 231j forms a lower surface on the back surface 231a side than the other portions over the entire length in the left-right direction. A concave portion 234 that accommodates the second convex portion 213a and the third convex portion 213b of the standard block 210 stacked on top is formed in the approximate center of the upper portion of the main body 231.

  A second inclined surface 232 that is lower on the back surface 231a side of the main body 231 is formed on the lower portion of the main body 231 on the back surface 231a side over the entire length in the left-right direction. The second inclined surface 232 increases the sliding resistance.

  FIG. 14 is a side view of the retaining wall 300 according to the second embodiment of the present application. FIG. 15 is a front view of the retaining wall 300 according to the second embodiment of the present application. In addition to the standard block 210 and the base block 230, the retaining wall 300 is configured using a plate-like member 217, a top end block 220, a left end block 240, and a right end block 250, as in the first embodiment. Moreover, the left top end block 260 and the right top end block 270 are used as necessary.

  As shown in FIG. 14, the foundation block 230 is installed so that the back surface 231a side is lowered so that the first inclined surface 231k is arranged in a substantially horizontal direction. The standard block 210, the left end block 240, and the right end block 250 are rear surfaces of a step portion 231 g in which the first convex portions 212, 242, and 252 (the first convex portion 242 is not shown) are formed on the upper portion of the base block 230. It is stacked on the foundation block 230 so as to be adjacent to the 231a side.

  According to the block and retaining wall of the present application described above, by completely converting the block retaining wall into a secondary product, the labor shortage is reduced by reducing the number of skill types such as masonry and formwork, and the on-site concrete is cured. The construction period can be shortened by reducing the period. For example, there are about 4 workers on site and can be easily installed by a truck with a crane.

  Further, according to the block and retaining wall of the present application, a publicly known design method can be applied, and a reliable structure can be obtained under various conditions. Conventional block retaining walls have been designed with empirically created standard sections, making it difficult to confirm theoretical safety.

  Moreover, according to the block and the retaining wall of the present application, since the concrete placed on site can be omitted, the curing period becomes unnecessary and the process can be shortened. The conventional block retaining wall is provided with foundation concrete, trunking, and backfilling concrete, so a curing period is required, and quality control becomes difficult in terms of construction time and location.

  Moreover, according to the block and retaining wall of this application, since it can design so that the force line calculated | required in the resultant force action positions, such as own weight and earth pressure, may pass in the retaining wall, it can be set as a structure without waste. The stone walls of the castle have such a structure and are extremely reasonable. Conventionally, the front and back surfaces are structured with a constant gradient, so that a wall width that encompasses curved power lines is required.

  Further, according to the block and retaining wall of the present application, the block has a front / rear / left / right meshing structure, so that deformation is extremely small even during an earthquake. Conventionally, since the retaining wall is made of monolithic concrete and has an integral structure, the entire wall collapses if more force than expected is applied. Even for level 2 earthquakes, it is possible to cope with sliding force by constructing a reinforcing bar insertion work in the foundation block as in the first embodiment. In recent residential land development, there is concern about damage caused by earthquakes, and reliability is required.

Moreover, according to the block and the retaining wall of the present application, it is possible to immediately backfill by simply applying the suction preventing material attached to the block to the gap between the blocks. Moreover, since it can drain from the clearance gap between blocks, it is not necessary to provide a water-permeable layer. Conventionally, the retaining wall has a structure in which approximately one drain hole is provided in 2 m ² and a crushed stone layer is constructed on the back surface. However, according to the block and retaining wall of the present application, those steps can be omitted. . Furthermore, it is not necessary to provide expansion joints in the blocks and retaining walls of the present application.

  Moreover, according to the block and retaining wall of this application, a block can be conveyed with a truck with a crane, can be lifted with the crane, and a retaining wall can be piled up. Fine adjustment is possible with a bar or the like. In addition, it is possible to easily hang the eyebolt by attaching it to the block, and the workability is good and safe. Conventionally, a special clamp is used and several parts are suspended, so it is inferior in safety.

  Moreover, according to the block and retaining wall of this application, since it becomes a stair-like structure, it is excellent in aesthetics. Conventionally, the retaining wall is often a flat surface, and it is inevitable that the intimidating feeling is landscaped. However, the intimidating feeling can be reduced by forming the curved wall as described above.

10, 210 Standard block 11, 211 Main body 11a, 211a Back surface 11b, 211b Front surface 211e, 211f Chamfered portion 12, 212 First convex portion 13a, 213a Second convex portion 13b, 213b Third convex portion 14, 214 Concavity 15, 215 Suction prevention sheet 16, 216 Eye bolt embedded nuts 17, 217 Plate members 20, 220 Top end block 21 Main body 22 First convex part 23a Second convex part 23b Third convex part 25 Suction prevention sheet 26 Embedded Nuts for Eyebolts 30 and 230 Base Blocks 31 and 231 Main bodies 31a and 231a Back surface 31b and 231b Front surface 31c Upper surface
31d Lower surface 31e Inclined surface 231f Left side surface 231g Right side surface 231h, 231i Chamfered portion 231j Stepped portion 232 Second inclined surface 34, 234 Recess 36 Eye bolt embedded nut 38 Through hole 40, 240 Left end block 41a Back surface 41b Front surface 42 First Convex part 43 Second convex part 44 Concave 46 Eyebolt embedded nuts 50 and 250 Right end block 51 Main body 51a Back surface 51b Front 52 First convex part 53 Second convex part 54 Concave 56 Eyebolt embedded nuts 60 and 260 Left ceiling block 61a Rear surface 61b Front surface 62 First convex portion 63 Second convex portion 66 Embedded bolts 70 and 270 for eyebolts Right ceiling block 71a Rear surface 71b Front surface 72 First convex portion 73 Second convex portion 76 Embedded nuts for eyebolts 100, 300 Retaining wall 101 Reinforcing bar GL1 Ground GL2 Ground FL Power line

Claims (5)

The back side facing the soil side,
A front side opposite to the back side,
A block that forms a retaining wall by stacking a plurality in a staggered pattern when viewed from the front side,
A first convex portion that protrudes downward from the back side portion and is disposed on the back side of the block stacked below;
Between the first convex portion and the front surface, a second convex portion protruding downward from the left side portion when viewed from the front side;
Between the first convex portion and the front surface, a third convex portion protruding downward from the right side portion as viewed from the front side;
The second convex part of the block that is formed in the upper part and is stacked on the upper right side when viewed from the front side, and the third convex part of the block that is stacked on the upper left side when viewed from the front side are accommodated. And a recess.   The block according to claim 1, further comprising a sucking prevention sheet attached to the first convex portion and covering a gap between the blocks stacked below.   The block according to claim 1, further comprising an embedded nut for an eyebolt at an upper portion. It has the block according to any one of claims 1 to 3,
A retaining wall comprising a plate-like member interposed between the back side portion of the block and the block stacked thereon.   The retaining wall according to claim 4, further comprising a foundation block disposed at a lowermost stage and fixed to the ground by a reinforcing bar insertion work.