JP2963378B2 - Concrete block and method of connecting concrete block - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete block used for constructing a retaining wall of a road or a residential land or a seawall of a river, and a method of connecting the concrete block.

[0002]

2. Description of the Related Art Conventionally, a concrete block having a front surface formed in a predetermined shape according to a purpose of use has been used for forming a retaining wall of a road or a residential land or building a seawall of a river. Examples of this type of concrete block include a small retaining wall block having a substantially U-shaped cross section and an L-shaped retaining wall block of a secondary concrete product. In addition, this type of concrete block includes a large retaining wall block used for revetment, road and residential land development.

[0003] The revetment retaining wall connects concrete blocks accurately and firmly in order to prevent the revetment wall from moving or changing its posture after construction due to the force of the waves or the flow of the river, thereby reducing the sufficient revetment effect. Must. Further, concrete blocks must be accurately and firmly connected not only to maintain aesthetic appearance but also to reliably prevent the occurrence of a fall accident on a retaining wall of a road or a residential land.

[0004]

However, in the conventional concrete block, the concrete block is connected to the front part, and the ready-mixed concrete is placed in the space between the back and the base or the back base. Since the filling was performed, it was difficult to accurately and firmly connect the concrete blocks. In addition, this conventional concrete block has a problem that when connecting other concrete blocks vertically and horizontally, the positioning is troublesome and the finished state is poor. For this reason, the construction of the retaining wall and the like requires skill, and it has been difficult to shorten the period. In addition, in the construction of the retaining wall, etc., the concrete block was filled with fresh concrete and the concrete blocks were connected to each other, but the connected concrete blocks moved, and sufficient revetment action was obtained. In some cases it was not possible.

Accordingly, the present invention provides a concrete block capable of accurately and firmly connecting concrete blocks and preventing a concrete block laying position from shifting after completion, and a method of connecting the concrete blocks. The purpose is to do.

[0006]

In order to solve the above-mentioned problems, a concrete block according to the present invention has a concave portion formed on one of an upper surface and a lower surface and a convex portion formed on the other surface. A first connecting projection formed with a connecting member mounting portion in which a connecting member for connecting a mating concrete block disposed adjacently in the vertical direction and projecting toward the mating concrete block is formed. And a second connecting protrusion formed with a connecting member engaging portion with which the distal end side of the connecting member attached to the connecting member attaching portion of the mating concrete block is engaged. A second connecting protruding portion vertically separated from each other in parallel with each other, integrally formed on the back surface of the front portion, and a retaining wall portion in which the axes of the connecting member attaching portion and the connecting member engaging portion are aligned with each other; Is provided. The mating concrete block is formed by fitting a concave portion or a convex portion of the front surface portion to a convex portion or a concave portion formed on the upper surface or the lower surface of the front surface portion of the mating concrete block, and attached to the connecting member mounting portion in advance. The connection is performed by engaging and connecting the connecting member to the connecting member engaging portion of the mating concrete block.

In the front part, a concave part is formed on one of the side surfaces orthogonal to the upper and lower surfaces of the front part, a convex part is formed on the other surface, and a concave part is formed on the side surface of the front part. Alternatively, the convex portion is fitted to a convex portion or a concave portion formed on a side surface orthogonal to the upper and lower surfaces of the front portion of the mating concrete block disposed adjacently in the left-right direction.

Further, the method for connecting concrete blocks according to the present invention is characterized in that a concave portion is formed on one of the upper surface and the lower surface, and a convex portion is formed on the other surface. Connecting projection formed with a connecting member mounting portion to which a base end side of a connecting member for connecting a mating concrete block arranged is mounted, and a connecting member engaging portion to which a distal end side of the connecting member is engaged Are formed integrally on the rear surface of the front surface portion by vertically separating the first connection protrusion portion and the second connection protrusion portion from each other in the vertical direction. What is claimed is: 1. A method for connecting a concrete block comprising a member mounting portion and a butting wall portion in which axes of a connecting member engaging portion are aligned with each other, wherein a concave portion or a convex portion formed on an upper surface and a lower surface of a front portion is formed by mating concrete. Top and bottom of the front part of the block A step of fitting the formed convex portion or the recessed portion, and a connecting member for connecting the mating concrete block, the distal end projecting in the direction of the mating concrete block, and the base end forming the first connecting protrusion. Attaching the connecting member to the connecting member mounting portion, and engaging the distal end side of the connecting member attached to the connecting member mounting portion with the connecting member engaging hole of the second connecting protrusion of the mating concrete block;
The method includes a step of fixing the mating concrete block and a step of filling the fresh concrete between the first connection protrusion and the second connection protrusion.

[0009] Further, in the method of connecting concrete blocks in the left-right direction, the connecting method includes a concave portion formed on one side surface orthogonal to the upper and lower surfaces of the front portion of the concrete block and a convex portion formed on the other side surface. And a step of fitting a convex portion or a concave portion formed on the side surface of the front surface portion of the mating concrete block disposed adjacently in the left-right direction.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a concrete block to which the present invention is applied and a method of connecting the concrete block will be described with reference to the drawings.

As shown in FIG. 1, a concrete block 1 to which the present invention is applied has a horizontally-long rectangular front surface portion 2;
It consists of a butting wall part 3 protruding and formed integrally with the back,
It is formed by pouring ready-mixed concrete into a formwork and solidifying it. The front part 2 constitutes the surface of the retaining wall after construction, and has a predetermined thickness. The front part 2 is formed so as to be gradually inclined toward the back with respect to the height direction. The shape of the front part 2 is not limited to the above-described horizontally long rectangle. A fitting portion 4 is formed on the outer peripheral side surface of the front surface portion 2 over the entire circumference.

The fitting portion 4 formed on the outer peripheral surface of the front portion 2 over the entire periphery is formed on the upper surface and on one side surface orthogonal to the upper surface so as to protrude so as to have a substantially triangular cross section. The fitting convex portion 5 (5A, 5B), the lower surface facing the upper surface, and the fitting concave portion 6 formed on the other side surface orthogonal to the lower surface and facing one side surface so as to have a substantially triangular cross section.
(6A, 6B). These fitting projections 5 and fitting recesses 6 are fitted to the fitting projections 5 and fitting recesses 6 formed on the upper and lower surfaces and the left and right side surfaces of the concrete block disposed adjacent to the upper and lower surfaces and the left and right side surfaces. Mated. That is, the combined concrete block 1 is provided on each opposing surface of the concrete blocks adjacent to each other.
The fitting convex portion 5 and the fitting concave portion 6 are formed so that the front surface portion 2 can form substantially the same surface.

[0013] Butt wall portion 3 formed on the back side of front portion 2
Are first connecting projections 7 (7A, 7B) formed so as to protrude from the upper surface side of the back surface of the front surface portion 2 and second connecting protrusions formed so as to protrude from the lower surface side of the back surface of the front surface portion 2 8 (8A,
8B), the first connecting protrusion 7 and the second connecting protrusion 8
Up and down part 9 (9A, 9B) connecting the base end of
The first connecting protrusion 7 and the second connecting protrusion 8 are formed so as to be parallel to each other in the vertical direction. The first connection protrusion 7 is provided with an attachment hole 10 (10A, 10B) in which a connection bolt 13 serving as a connection member is mounted near the distal end, and the second connection protrusion 8 is provided with the connection bolt. 13 is engaged with the engaging hole 11 (11A, 1A).
1B) is formed, and the mounting hole 10 and the engaging hole 11 are formed so that their axes are aligned with each other.

A cylindrical anchor 12 (12) to which a base end of a coupling bolt 13 is screwed and fixed is provided in the mounting hole 10.
A, 12B). The anchor 12 is disposed by being embedded when the concrete block 1 is formed, and functions as a bolt mounting hole. The engagement hole 11 functions as a bolt engagement hole through which the connection bolt 13 of the concrete block 1 disposed adjacent to the lower surface side is inserted.

The concrete block 1 constructed as described above is disposed on a base block 15 provided on a foundation 14, as shown in FIG. The base block 15
It is installed and fixed with the horizontality maintained with respect to the formed foundation 14. The base block 15 has a step 16 formed on the upper surface. The step 16 is formed to have a substantially triangular cross section so that the fitting recess 6A formed on the lower surface of the front surface 2 of the concrete block 1 can be fitted. The mating recess 6A is fitted.

The first concrete block 1A is set on the base block 15 by fitting the fitting recess 6A into the step portion 16. In the first-stage concrete block 1A, the mounting holes 1 of the first connecting projections 7 are provided.
The base end of the connecting bolt 13 is screwed into the anchor 0 via the anchor 12 and fixed. As shown in FIG. 2, the connecting bolt 13 projects upward from the first-stage concrete block 1A in the direction of the concrete block 1B disposed above. Further, the coupling bolt 13 includes a block receiving plate 18 that is in contact with the second connecting projection 8 of the concrete block 1B, and a level adjusting nut 17 that adjusts the position of the block receiving plate 18 in the vertical direction. Is assembled.

The level adjusting nut 17 is connected to the connecting bolt 13
, The height of the block receiving plate 18 is adjusted so as to be at substantially the same height position as the fitting convex portion 5A formed on the upper side surface of the front surface portion 2. Here, the height of the block receiving plate 18 does not need to be adjusted very precisely.
Fine adjustment is performed after B is attached.

As shown in FIG. 2, the second-stage concrete block 1B is disposed on the first-stage concrete block 1A installed on the base block 15 as described above. . In the second-stage concrete block 1B, a fitting recess 6A formed on the lower surface of the front surface 2B is fitted to a fitting protrusion 5A formed on the upper surface of the front surface 2A of the concrete block 1A. You. further,
The second-stage concrete block 1B is provided with connecting bolts attached to the first connection protrusions 7 of the first-stage concrete block 1A in engagement holes 11 provided in the second connection protrusions 8. 13 is inserted.

Thus, when the second-stage concrete block 1B is disposed above the first-stage concrete block 1A, the concrete block 1B
Is fitted to the connecting bolt 13 which is projected from the engaging hole 11 by the block pressing plate 19 for suppressing the pressure from above. Then, a fixing nut 20 is temporarily screwed into the distal end side of the coupling bolt 13, and then the level adjustment nut 17 is rotated,
By being moved up and down, fine adjustment of the height or inclination of the front surface portion 2B is performed via the block receiving plate 18.
In this height adjustment step, since the level adjustment nut 17 can be rotated from outside using a spanner, a monkey, or the like, the concrete block 1 can be safely connected. After that, the first-stage concrete block 1A and the second-stage concrete block 1B
Are firmly connected and fixed to each other by tightening the fixing nut 20.

The concrete blocks 1 are stacked in multiple stages by successively repeating this operation to construct a retaining wall having a predetermined height. Also, the concrete blocks 1 are arranged side by side by fitting the fitting projections 5B and the fitting recesses 6B on the left and right side surfaces of the front surface 2 thereof, so that a retaining wall having a predetermined length can be constructed.

In the concrete blocks 1 arranged and connected in this manner, the space between the first connecting protrusions 7A and 7B of the butting wall 3 is connected to the ground 14 or the base block 15. Ready-mixed concrete is filled into the space H formed so as to be firmly fixed.

As described above, the concrete block 1
Can be connected in up, down, left, and right directions by a very simple process, and the construction period can be significantly reduced. In addition, the concrete block 1 can be positioned by rotating the level adjustment nut 17 assembled to the connection bolt 13, and the front surface 2 fits the fitting protrusion 5 and the fitting recess 6. Thereby, it is possible to precisely combine them, and to increase the finishing accuracy of the retaining wall.

Next, a concrete block 30 which is a modification of the above concrete block 1 will be described with reference to FIG. The concrete block 30 to which the present invention is applied is characterized in that, as compared with the concrete block 1 described above, the length of the retaining wall portion 31 is gradually shortened as the length is stacked upward. In the description of the concrete block 30, the same parts as those of the concrete block 1 described above are denoted by the same reference numerals, and the details thereof are omitted.

As shown in FIG. 3, the concrete block 30 forms a butting wall 31 and has a first connecting projection 7.
The notch 32 connecting the base end of the second connecting protrusion 8 to the
It is formed so that the length protruding upward in the vertically stacked state becomes shorter. Also,
The first connection protrusion 7 and the second connection protrusion 8 are formed such that the protrusion dimension is gradually reduced with respect to the front surface 2 formed to be inclined gradually toward the rear side with respect to the height direction. Have been. Therefore, each concrete block 30A, 3A
.., 0B,..., The mounting holes 10 of the first connecting projections 7 and the second connecting projections 8
Are arranged so that the axis line is aligned with the engaging hole 11.

The first-stage concrete block 30A, which is configured as described above and is disposed on the base block 15 provided on the foundation 14, is provided with the step 16 of the base block 15.
The fitting concave portion 6 formed on the lower surface of the front portion 2 </ b> A is fitted to the base block 15. The first connecting projection 7 is provided on the first concrete block 30A.
The connecting bolt 13 is attached to the mounting hole 10 with its tip protruding upward.

The first-stage concrete block 30
A is provided with a second-stage concrete block 30B as follows, that is, the second-stage concrete block 30B is provided with the first-stage concrete block 3B.
By fitting the fitting protrusions 5 formed on the upper surface of the front surface portion 2A of the first portion 0A into the fitting recesses 6 formed on the lower surface of the front surface portion 2B, the upper surface of the first-stage concrete block 30A is arranged. Is established. At this time, the second-stage concrete block 30B is replaced with the first-stage concrete block 30B.
Since the mounting holes 10 of the first connecting protrusions 7 and the engaging holes 11 of the second connecting protrusions 8 are disposed on A with their axes coincident with each other, the second connecting protrusions 8 are formed. The first engagement hole 11
First connecting projection 7 of concrete block 30A of step
The leading end side of the coupling bolt 13 attached to the connector is inserted.

Then, the second-stage concrete block 30B is firmly connected and fixed to the first-stage concrete block 30A by tightening the fixing nut 20 to the tip end of the connecting bolt 13 inserted through the engagement hole 11. Is done. Hereinafter, the second stage concrete block 30B
, A third-stage concrete block 30C is similarly arranged and connected and fixed.

In the above-described concrete block 30, the retaining wall portion 31 of the concrete block disposed above the retaining wall is formed to be small and lightweight, so that it is easy to handle and the workability is improved. Is achieved. The mounting wall 10 of the concrete block 30 vertically adjacent to the mounting hole 10 of the first connection protrusion 7 and the engagement hole 11 of the second connection protrusion 8 are aligned with each other.
Is formed, the workability can be improved.

Further, another concrete block 40 to which the present invention is applied will be described in detail with reference to FIG. In the description of the concrete block 40, the same parts as those of the concrete block 1 described above are denoted by the same reference numerals, and the details thereof are omitted.

As shown in FIG. 4, the concrete block 40 has a first connecting projection 41 and a second connecting projection 41 which are provided on the rear surface of the front part 2 and which are vertically separated from each other. 42 constitutes a retaining wall. These first
Are formed as horizontal walls facing each other in parallel with each other, and the first connection projection 41 is provided with a first engagement hole 43, The second connection protrusion 42 is provided with a second engagement hole 44.

When the first engaging holes 43 and the second engaging holes 44 are combined with the front portions 2A and 2B which are inclined with respect to the vertical direction, as shown in FIG. The first connection protrusion 41 and the second connection protrusion 42 are arranged such that the first engagement hole 43A of the first connection protrusion 40A and the second engagement hole 44B of the concrete block 40B on the upper stage are coaxially located. Each is provided. In addition, the first engagement hole 43 and the engagement hole 44 are
And the second connecting protrusion 42 are formed as long holes whose major axis is in a direction parallel to the front surface 2.

An adjusting bolt mounting hole 45 into which the adjusting bolt 46 is screwed is formed in the second connecting projection 42 on the base end side of the engaging hole 44. Although not shown, a tubular anchor is embedded in the adjustment bolt mounting hole 45 when the concrete block 40 is formed. The adjustment bolt 46 is screwed into the adjustment bolt mounting hole 45 from above the second connection protrusion 42, and a tip portion of the adjustment bolt 46 projects downward through the second connection protrusion 42. Adjusting bolt 46
Is abutted against the main surface of the first connecting portion 41,
The height position of the concrete block 40 can be adjusted by adjusting the screwing amount.

The lower concrete block 40A constructed as described above is fitted to the mating projection 5 formed on the upper surface of the front part 2 by the front part 2 of the upper concrete block 40B.
The fitting recess 6 formed on the lower surface of B is fitted, and an upper concrete block 40B is provided. In the lower concrete block 40A, the coupling bolt 13 is attached to the first engagement hole 43 of the first connection projection 41 so that the tip end protrudes upward. First engagement hole 43
Is formed as a long hole, so that the connecting bolt 1
3 can adjust the mounting position to the first engagement hole 43 within the dimensional range of the elongated hole.

In the upper concrete block 40B,
The second engaging hole 44 of the second connecting projection 42 is formed as a long hole, and when being combined with the lower concrete block 40 </ b> A, the connecting bolt 13 is connected to the second engaging hole 4.
4 can be easily engaged. Therefore,
The lower concrete block 40 </ b> A and the upper concrete block 40 </ b> B are firmly connected to each other by the connection bolt 13 attached to the first engagement hole 43 being inserted into the second engagement hole 44 and tightening the fixing nut 20. It is connected and fixed.

Further, the adjusting bolt 46 is inserted into the adjusting bolt mounting hole 45, and the tip is pressed against the main surface of the first connecting projection 41, whereby the height of the upper concrete block 40B with respect to the lower concrete block 40A is reduced. The position can also be adjusted. Therefore, the interval between the lower concrete block 40A and the upper concrete block 40B can be accurately adjusted by the adjustment bolt 46, and the finish of the retaining wall can be improved.

The concrete block 40 has a first
Since the engaging hole 43 and the second engaging hole 44 are formed as long holes, it is possible to dispose the lower concrete block 40A and the upper concrete block 40B in a shifted state, Therefore, a retaining wall having a curved surface can be constructed.

Next, a concrete block 50 which is a modified example of the above concrete block 1 will be described with reference to FIG. In the description of the concrete block 50, the same parts as those of the concrete block 1 described above are denoted by the same reference numerals, and the details thereof are omitted.

As shown in FIG. 5, the concrete block 50 has a front surface 51 formed of a vertical surface, and a retaining wall 52 orthogonally and integrally protruding from the front surface 51. Similarly to the concrete block 1, on the side surface of the front part 51, a fitting convex part 5 and a fitting concave part 6 forming the fitting part 4 are formed. The butting wall portion 52 protruding from the rear side of the front portion 51 includes a first connecting protrusion 7 having an attachment hole 10 and a second connecting protrusion 8 having an engaging hole 11.

The concrete block 50A constructed as described above is used for the base block 15
The fitting recess 6 is fitted into the step 16 of the base block 15.
Arranged above. In the first concrete block 50A, a coupling bolt 13 is attached to the first connecting projection 7 such that the base end is attached to the attachment hole 10 and the tip is protruded upward.

The first-stage concrete block 50
A is fitted with a fitting concave portion 6 on the lower surface formed on the front surface portion 2 of the second concrete block 50B with a fitting convex portion 5 on the upper surface of the front surface portion 51 of the second concrete block. 50B is provided. First stage concrete block 50A and second stage concrete block 50B
Is firmly connected and fixed to each other by tightening a fixing nut 20 screwed into a coupling bolt 13 penetrating the engaging hole 11. Hereinafter, the third-stage concrete block 50C is disposed and fixed to the second-stage concrete block 50B as described above. Thus, the concrete block 50 forms a retaining wall having a surface perpendicular to the ground surface 14.

Next, a concrete block 60 which is a modification of the above-described concrete block 1 will be described with reference to FIG. The concrete block 60 is characterized in that the length of the retaining portion 63 constituting the retaining wall portion 62 differs from the concrete block 50 depending on the height at which the concrete block 60 is stacked. In addition, this concrete block 6
In the description of 0, the same portions as those of the concrete block 1 described above are denoted by the same reference numerals, and the details are omitted.

As shown in FIG. 6, the concrete block 60 has a front surface 61 formed on a vertical surface, and a retaining wall 62 projecting from the front surface 61 at right angles. Compared with the concrete block 50, the concrete block 60 is formed so as to have a different projection size corresponding to the position where the butting portion 63 constituting the butting wall portion 62 is arranged in the up-down direction.

In the first-stage concrete block 60A configured as described above, the fitting recess 6 is fitted into the step 16 of the base block 15 installed on the base 14, and the concrete block 60A is placed on the base block 15. Will be arranged. The connecting bolt 13 is attached to the first connecting projection 7 of the first-stage concrete block 60A so that the base end is attached to the attachment hole 10 and the tip is protruded upward.

The first concrete block 60
A is fitted into the fitting projection 5 on the upper surface of the front part 61 and the fitting recess 6 on the lower surface formed on the front part 2 of the second concrete block 60B. Block 60B is provided. First stage concrete block 60A and second stage concrete block 60
B is firmly connected and fixed to each other by tightening a fixing nut 20 screwed into a coupling bolt 13 penetrated through the engagement hole 11. Hereinafter, the third-stage concrete block 60C is disposed and fixed to the second-stage concrete block 60B as described above. The engagement holes 11 provided in the second connecting projection 8 and the connecting bolts 13 attached to the lower connecting projection 7 are stacked and stacked at the corresponding positions so that their axes are aligned with each other. Thus, the concrete block 50 forms a retaining wall having a surface perpendicular to the ground surface 14.

In this case, like the retaining portions 63 of the first and second concrete blocks 60A and 60B shown in FIG. 6, the projecting lengths may be the same. The length may be changed like the retaining portions 63 of the concrete blocks 60B and 60C of the eyes, and various selections can be made in consideration of the strength of the retaining wall and the simplicity of workability.

Each of the above concrete blocks 1, 3
In the case of 0, 50, and 60, the case where the connecting bolt 13 is screwed into the mounting hole 10 to which the first connecting protrusion 7 is attached in order to connect the concrete blocks stacked adjacent to each other has been described. As shown in FIG. 7, the anchor bolt 70 may be integrally implanted. As shown in the figure, the anchor bolt 70 is bent in an L-shape to prevent the lower end portion 71 from coming off, and when forming the concrete blocks 1, 30, 50, 60, It is integrated by being installed inside.

[0047]

According to the concrete block of the present invention, a mating concrete block is formed by fitting a concave portion or a convex portion of a front surface portion to a convex portion or a concave portion of a front surface portion of a mating concrete block and attaching a connecting member. By connecting and fixing the connecting member previously attached to the portion to the connecting member engaging portion of the mating concrete block,
The concrete blocks can be easily and firmly connected. Therefore, the construction period of the retaining wall can be shortened.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a concrete block according to the present invention from the rear side.

FIG. 2 is a main part side view showing a state where the concrete blocks are stacked.

FIG. 3 is a main part side view showing a state where another concrete block according to the present invention is stacked.

FIG. 4 is a main part perspective view showing a state where another concrete block according to the present invention is stacked.

FIG. 5 is a main part side view showing a state where another concrete block according to the present invention is stacked.

FIG. 6 is a main part side view showing a state where another concrete block according to the present invention is stacked.

FIG. 7 is a cross-sectional view of a main part illustrating another supporting structure of the connecting bolt.

[Explanation of symbols]

1. Concrete block, 2. 2. front part; Butt wall, 4. 4. fitting part; 5. fitting projection, 6. fitting recess, 7. first connecting projection; 8. second connecting projection; Copy, 1
0. Mounting holes, 11. 11. engagement hole; Anchor, 13. Coupling bolts, 14. Groundwork, 15. Base block, 16. Step, 17. Level adjustment nut, 18. Block receiving plate,
19. Block holding plate, 20. Fixing nut

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-54-48902 (JP, A) JP-A-3-36329 (JP, A) JP-A-8-13518 (JP, A) JP-A 8- 260473 (JP, A) Japanese Utility Model 5-16842 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) E02D 29/02 303 E02B 3/14 301

Claims (9)

(57) [Claims] 1. A front part having a concave portion formed on one of an upper surface and a lower surface and a convex portion formed on the other surface is connected to a mating concrete block arranged vertically adjacently. A first connecting projection formed with a connecting member mounting portion in which a connecting member protruding in the direction of the mating concrete block is formed, and a connecting member mounted on the connecting member mounting portion of the mating concrete block. A second connecting protrusion formed with a connecting member engaging portion to be engaged with the distal end side, and separating the first connecting protrusion and the second connecting protrusion parallel to each other in the vertical direction. A connecting wall formed integrally with the back surface of the front portion, and a connecting wall portion in which the connecting member engaging portion and the connecting member engaging portion are aligned with each other. The concave or convex part of the front part The mating member is fitted into a convex portion or a concave portion formed on the upper surface or lower surface of the front surface portion of the mating concrete block, and the connecting member previously attached to the connecting member attaching portion is engaged with the mating member engaging portion of the mating concrete block. A concrete block characterized by being connected by being combined and fixed. 2. The front surface has a concave portion on one of side surfaces orthogonal to upper and lower surfaces of the front portion, a convex portion on the other surface, and a side surface of the front portion. The recessed portion or the convex portion provided is fitted to a convex portion or a concave portion formed on a side surface orthogonal to the upper and lower surfaces of the front portion of the mating concrete block disposed adjacently in the left-right direction. The concrete block according to claim 1. 3. At least one of a connecting member mounting portion formed on the first connecting protrusion and a connecting member engaging portion formed on the second connecting protrusion has a direction parallel to the front surface portion. The concrete block according to claim 1, comprising a long hole having a long axis. 4. A block receiving plate which is inserted into said connecting member, abuts against said second connecting projection of said counterpart concrete block facing said first connecting projection, and receives said counterpart concrete block. And a level adjustment nut screwed into the connection member in a gap between the first connection protrusion and the second connection protrusion of the mating concrete block to adjust the position of the block receiving plate. The mating concrete block, which is disposed adjacently in the vertical direction, has its connection position adjusted via a block receiving plate by rotating the level adjustment nut. Any one of claims 1 to 3
The concrete block as described. 5. The method according to claim 1, wherein the front portion is gradually inclined toward the rear side with respect to the up-down direction, and the length of the butting wall portion gradually protrudes from the front portion as it is stacked on the upper stage. The concrete block according to any one of claims 1 to 4, wherein the concrete block is a concrete block. 6. A front surface having a concave portion formed on one of the upper surface and the lower surface and a convex portion formed on the other surface is connected to a mating concrete block disposed adjacently in the vertical direction. A first connecting protrusion formed with a connecting member mounting portion to which a base end side of the connecting member is mounted, and a second connecting protrusion formed with a connecting member engaging portion engaged with a distal end of the connecting member. The first connecting protrusion and the second connecting protrusion are separated from each other in the up-down direction in parallel with each other, are integrally formed on the back surface of the front surface portion, and are formed integrally with the connecting member mounting portion. A method of connecting a concrete block comprising a butting wall portion having an axis aligned with a connecting member engaging portion, wherein a concave portion or a convex portion formed on an upper surface and a lower surface of the front surface portion is formed on a front surface portion of the mating concrete block. Protrusions formed on the upper and lower surfaces of And a connecting member for connecting the mating concrete block, the tip of which is projected in the direction of the mating concrete block, and the base end of which is connected to the first connecting protrusion. A step of attaching to the attachment portion, a step of engaging a distal end side of the connection member attached to the connection member attachment portion with a connection member engagement hole of a second connection protrusion of the counterpart concrete block, A method of connecting a concrete block, comprising: fixing a side concrete block; and filling a fresh concrete between the first connection protrusion and the second connection protrusion. 7. A mating concrete which is disposed adjacent to the concave portion formed on one side surface orthogonal to the upper and lower surfaces of the front portion of the concrete block and the convex portion formed on the other side surface in the left-right direction. The method for connecting concrete blocks according to claim 6, further comprising a step of fitting a convex portion or a concave portion formed on a side surface of the front portion of the block. 8. The step of fixing the mating concrete block includes contacting a second connecting projection of the mating concrete block with a block receiving plate inserted through the connecting member, and Adjusting the connection position of the counterpart concrete block by rotating a level adjustment nut screwed to the connection member in a gap between the portion and the second connection protrusion of the counterpart concrete block. 6. The method according to claim 6, wherein
The method for connecting concrete blocks according to the description. 9. The concrete block installed at the lowest stage has a concave portion or a convex portion formed on the lower surface of the front portion,
9. The method for connecting concrete blocks according to claim 6, wherein the concrete block is installed by being fitted into a convex portion or a concave portion formed on the foundation.