JP2017150275A - Retaining wall concrete block construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a retaining wall concrete block construction method to further strengthen installation of a retaining wall concrete block.SOLUTION: A retaining wall concrete block construction method has a wall part 2 and an inclined bottom plate part 3 that continues to a lower part of the wall part 2 and inclines downward. The method comprises at least: a foundation formation process to form a foundation 80 in order to install a retaining wall concrete block 1; an installation process to install the retaining wall concrete block 1 on the foundation 80; an installation process to install a concrete 200 into a space 300 formed between the inclined bottom plate part 3 and the foundation 80 from a lateral surface of the inclined bottom plate part 3; and a fill process to make a fill 101 on a top face of the inclined bottom plate part 3.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a concrete block construction method for retaining walls.

Japanese Patent No. 2896763

Patent Document 1 describes the structure of a concrete block manufacturing formwork provided with a heating device as a formwork for manufacturing a soil retaining concrete block used for residential land development work or the like.
The concrete block formed by this concrete block manufacturing form is a retaining wall concrete block having a wall portion and an inclined bottom surface portion continuous to the wall portion.

By the way, in retaining work such as residential land construction work, when the retaining wall is constructed using the retaining wall concrete block as described above, the retaining wall concrete block is placed on a horizontal base. Since it was installed in a state, the installation could not be sufficiently secured even after installation, and there was a risk of sliding, tilting, settling and the like.
Then, this invention aims at provision of the concrete block construction method for retaining walls for strengthening the installation of the concrete block for retaining walls.

The retaining wall concrete block construction method according to the present invention is a retaining wall concrete block construction method comprising a wall portion and a downwardly inclined sloped bottom plate portion continuous with the lower portion of the wall portion, wherein the retaining wall concrete is A foundation forming step for forming a foundation for installing a block; an installation step for installing the retaining wall concrete block on the foundation; and the inclined bottom plate in a space formed between the inclined bottom plate portion and the foundation. At least a placing step for placing concrete from the side surface of the portion and a filling step for filling the upper surface of the inclined bottom plate portion.
By placing concrete in a space formed between the inclined bottom plate portion and the foundation, at least both side surfaces of the inclined bottom plate portion can be filled with concrete without a gap.

In the retaining wall concrete block construction method described above, in the foundation forming step, the foundation to be formed may have a reinforcing portion protruding from the surface.
Since the foundation has the reinforcing portion protruding from the surface, when the concrete is placed in the space formed between the inclined bottom plate portion and the foundation, the concrete is also bonded to the reinforcing portion.

In the concrete block construction method for retaining walls described above, it is conceivable that the inclined bottom plate portion is formed in a substantially trapezoidal shape in which the width of the front edge in the left-right direction is longer than the width of the rear edge in the left-right direction.
For example, when installing a plurality of retaining wall concrete blocks, a certain gap can be secured between the inclined bottom plate portions of the adjacent retaining wall concrete blocks.

In the retaining wall concrete block construction method described above, it is conceivable that a cut portion is provided on a side surface of the inclined bottom plate portion, and the concrete is placed from the cut portion in the placing step.
By providing a cut in the inclined bottom plate portion, concrete is cast from the cut.

In the above-described concrete block construction method for retaining walls, it is conceivable that an injection hole is provided on the upper surface of the inclined bottom plate portion, and the placing step further includes a step of placing concrete from the injection hole.
Concrete can be placed in a space that cannot be filled in the placing step of pouring concrete from the side surface of the inclined bottom plate portion.

In the above-described concrete block construction method for retaining walls, it is conceivable that an uneven portion is formed on the bottom surface of the inclined bottom plate portion.
A wall part is firmly supported by continuing the inclined baseplate part of a downward slope on the back surface of a wall part. In addition, since the uneven portion is formed on the bottom surface of the inclined bottom plate portion, the engagement with the soil is strengthened and the contact area is increased during the earthing.

In the retaining wall concrete block construction method described above, the retaining wall concrete block includes a reinforcing rib in which a tapered hole is formed from the wall portion to the inclined bottom plate portion, and a plurality of the retaining wall concrete blocks are inserted by inserting a connecting member into the tapered hole. It is conceivable to have a connecting step of connecting the retaining wall concrete blocks.
The connection as a whole of the plurality of retaining wall concrete blocks is strengthened by inserting the connecting member into the tapered hole.

According to the present invention, stability is increased when the retaining wall concrete block is installed before the earth retaining, and the subsequent earth retaining can be easily performed. In addition, since the foundation is firmly bonded to the concrete even after construction, the high heel shape of the retaining wall concrete block can be easily fixed to the concrete, increasing the stability of the retaining wall concrete block and sliding. Phenomena such as tilting and settling can be prevented.
As a result, it is possible to prevent accidents due to sliding or tilting of the retaining wall concrete block during construction, and safe construction work is possible. In addition, it is possible to prevent secondary disasters that may occur when a disaster occurs after construction, or unexpected accidents due to aging.

It is the perspective view which looked at the concrete block for retaining walls of embodiment from the front side and the back side. It is explanatory drawing which showed a mode that the concrete block for retaining walls of embodiment was used for earth retaining of embankment, and the state by which the concrete block for several retaining walls was arranged side by side. It is a perspective view of a concrete block manufacturing formwork for a retaining wall of an embodiment. It is a perspective view of the concrete block manufacturing formwork for a retaining wall shown in the state which removed the inclined baseplate shaping | molding board and shaping | molding board | substrate of embodiment from the mounting base. It is a perspective view of the shaping | molding board | substrate of embodiment. It is explanatory drawing of the construction method of the concrete block for retaining walls of embodiment, and the schematic of the modification of a board | substrate. It is explanatory drawing of the connection reinforcement part of embodiment, and explanatory drawing of the clearance gap produced between the concrete block for retaining walls, and concrete. It is explanatory drawing of the construction method of the concrete block for retaining walls in 2nd Embodiment of embodiment. It is the perspective view which looked at the concrete block for retaining walls in 3rd Embodiment of embodiment from the front side and the back side. It is a perspective view of the inclination bottom plate shaping | molding board in 3rd Embodiment of embodiment. It is a perspective view of the concrete block manufacturing formwork for retaining walls in 3rd Embodiment of embodiment. It is explanatory drawing of the construction method of the concrete block for retaining walls in 3rd Embodiment of embodiment. It is the perspective view which looked at the concrete block for retaining walls in the modification of embodiment from the front side, and the explanatory view which showed a mode that concrete was filled into the formed space. It is the perspective view which looked at the concrete block for retaining walls in the modification of embodiment from the front side and the back side. It is the perspective view which looked at the concrete block for retaining walls in the modification of embodiment from the back side, and the explanatory view which showed a mode that concrete was filled into the formed space. It is explanatory drawing which showed a mode that the concrete block for retaining walls in the modification of embodiment was used for the earth retaining of embankment.

  EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing the concrete block manufacturing formwork for this invention retaining wall is demonstrated with reference to an accompanying drawing.

<1. Structure of retaining wall concrete block>
First, the configuration of the retaining wall concrete block manufactured in the present embodiment will be described with reference to the accompanying drawings.
The concrete block for retaining wall of the present invention is mainly used for constructing a retaining wall in earth retaining work such as residential land creation work.

  Hereinafter, in the description of the retaining wall concrete block 1, the surface direction of the retaining wall concrete block 1 is assumed to be the front, and as shown in FIG. The front-back, up-down, left-right directions are based on the state in which the retaining wall concrete block 1 as shown in FIG. However, the front, back, up, down, left and right directions shown below are for convenience of explanation, and the implementation of the present invention is not limited to these directions.

  As shown in FIG. 2B, the retaining wall concrete blocks 1 are arranged side by side to hold the earth. As shown in FIG. 1A and FIG. 1B, the retaining wall concrete block 1 is connected to a wall portion 2 formed in a vertically long rectangular substantially flat plate shape facing the front-rear direction and a lower portion of the back surface of the wall portion 2. It has the inclined bottom plate part 3 and the reinforcing rib 4 formed thickly across the upper surface of the inclined bottom plate part 3 from the back surface of the wall part 2.

  The wall 2 is formed with a fitting recess 2a and a fitting projection 2b on both side surfaces. As shown in FIG. 2B, when the retaining wall concrete blocks 1 are installed side by side, the fitting recess 2a and the fitting convex part 2b are adjacent to each other, and the retaining recesses 2a are adjacent to each other. And the fitting protrusion 2b are formed to be fitted.

  The wall 2 is formed in a substantially trapezoidal shape that becomes narrower as the width in the left-right direction approaches the bottom surface. Although the wall 2 is formed in a substantially trapezoidal shape, it is such that it looks like a substantially rectangular shape when visually recognized. For example, one side of the top surface is 100 cm and one side of the bottom surface is 90 to 98 cm. By arranging such retaining wall concrete blocks 1 side by side, an arch mechanism is formed, and a stronger foundation can be formed in residential land development work or the like. Note that one side of the top surface only needs to be longer than one side of the bottom surface, and is not limited to the above length.

  Various patterns may be formed on the surface of the wall surface 2. For example, as the pattern, a stripe pattern, a natural stone pattern, a tile pattern, a wood grain pattern, a brick pattern, or the like may be formed. Since the pattern is formed on the surface of the wall surface 2, the cold background of the concrete is covered with the pattern and a warm impression can be given. Therefore, the aesthetic appearance of the retaining wall concrete block 1 can be improved.

  As shown in FIG. 2A, the inclined bottom plate portion 3 is integrally formed with the wall portion 2 at an angle θ. The angle θ is formed to be 105 degrees. That is, the retaining wall concrete block 1 has a so-called high heel shape structure in which the wall portion 2 and the inclined bottom plate portion 3 support each other. Thereby, when installing the concrete block 1 for retaining walls before earth retaining, stability increases, and subsequent construction such as earth retaining can be easily performed. Moreover, a stable state can be maintained after construction, and sliding, tilting, settling and the like of the retaining wall concrete block 1 can be reduced or prevented.

  As shown in FIG. 1A, the inclined bottom plate portion 3 is formed in a substantially trapezoidal shape in which the width X in the left-right direction of the front edge is longer than the width Y in the left-right direction of the rear edge. This is to prevent any problem even if the inclination is slightly different when arranging the plurality of retaining wall concrete blocks 1. Further, when installing a plurality of retaining wall concrete blocks 1, a certain gap is secured between the inclined bottom plate portions 3 of the adjacent retaining wall concrete blocks 1. Therefore, the concrete 200 can be reliably poured into the space 300 formed between the inclined bottom plate portion 3 and the foundation 80 as shown in FIG. 6 from the side surface of the inclined bottom plate portion 3.

  As shown in FIGS. 1B and 2B, the reinforcing rib 4 has two tapered holes 4a and 4b at predetermined portions. When the plurality of retaining wall concrete blocks 1 are arranged, the tapered holes 4a and 4b are for inserting the connecting members 90 and connecting the adjacent retaining wall concrete blocks 1 to each other as shown in FIG. 2B. Used. As the connecting member 90, a wire rope or the like can be considered.

<2. Structure of concrete block manufacturing formwork for retaining wall>
Next, the structure of the concrete block manufacturing form 10 (retaining wall concrete block manufacturing form) used for manufacturing the retaining wall concrete block 1 will be described with reference to the accompanying drawings.
As shown in FIG. 3, the concrete block manufacturing mold 10 includes a molded substrate 20, an inclined bottom plate molded plate 30, and a mounting base 40.

  Hereinafter, in the description of the concrete block manufacturing form 10, the direction of the inclined bottom plate forming plate 30 of the concrete block manufacturing form 10 is assumed to be the front, and as shown in FIG. The front / back / up / down / left / right directions are based on the state in which the concrete block manufacturing form 10 is installed. However, the front, back, up, down, left and right directions shown below are for convenience of explanation, and the implementation of the present invention is not limited to these directions.

  3 to 5, the molded substrate 20 includes a retaining wall molded base 21, a top end 22, an inclined bottom plate molded base 23, an inclined bottom plate molded frame 24, a reinforcing rib mold frame 25, a taper pin 26a, 26 b and a joining hook 27. The molded substrate 20 is formed of, for example, an iron plate.

The retaining wall molding base 21 is a surface on which the rear surface (the side on which the reinforcing rib 4 is formed) of the wall portion 2 of the retaining wall concrete block 1 is molded.
The top end portion 22 is a surface on which the upper surface of the wall portion 2 (the surface that becomes the upper end in the installed state of FIG. 2A) is formed.

The inclined bottom plate forming base 23 is a surface on which the upper surface (the side on which the reinforcing rib 4 is formed) of the inclined bottom plate 3 of the retaining wall concrete block 1 is formed.
Inclined bottom plate forming frame portions 24 are formed on three sides around the inclined bottom plate forming base 23, whereby both side surfaces and end surfaces of the inclined bottom plate 3 are formed. The inclined bottom plate forming frame portion 24 is formed in a substantially trapezoidal shape so that an inclined bottom plate forming surface portion 31 to be described later is fitted.

A reinforcing rib frame 25 is formed from the wall forming base 21 to the inclined bottom plate forming base 23.
The reinforcing rib frame 25 forms a space for molding the reinforcing rib 4 in the retaining wall concrete block 1 described above. Tapered pins 26 a and 26 b are attached in the reinforcing rib mold frame portion 25. Tapered holes 4a and 4b as shown in FIG. 1B are formed in the reinforcing rib 4 by the taper pins 26a and 26b.
The joining hooks 27 are respectively formed on the inclined bottom plate forming frame portions 24 on both side surfaces of the inclined bottom plate forming base portion 23. Details of the joining hook 27 will be described later.

  As shown in FIG. 3, the molded substrate 20 is mounted on the upper surface of the mounting table 40. In addition, in this Embodiment, although the shaping | molding board | substrate 20 is detachably mounted from the mounting base 40, the molding board | substrate 20 may be formed integrally with the mounting base 40. FIG.

  As shown in FIG. 3 or 4, the mounting table 40 is formed by assembling a support frame 41 in a box shape. In addition, the form of the framework by the support frame 41 is not limited to the illustrated one. Moreover, it may replace with a framework and may form so that the circumference | surroundings may be covered with a plate-shaped member.

Side walls 42 (first side walls) and 43 (second side walls) are provided on both sides of the upper portion of the mounting table 40.
Each of the side wall portions 42 and 43 is attached to a transfer member 44 and 44 having an L-shaped cross section forming the framework of the mounting frame 40 with a hinge 45, and forms a side wall as shown in FIG. It can be opened and closed in a state of being opened and in a state of being opened horizontally as shown in FIG. In this way, the retaining wall concrete block 1 having the fitting concave portion 2a and the fitting convex portion 2b can be taken out from the concrete block manufacturing formwork 10 by being made openable and closable.

  The side wall portions 42 and 43 are surfaces on which both side surfaces of the wall portion 2 of the retaining wall concrete block 1 are molded. As described above, the fitting concave portion 2 a and the fitting convex portion 2 b are formed on both side surfaces of the wall portion 2. In order to form the fitting recess 2a, the side wall portion 42 is formed with a convex portion 42a. In order to form the fitting convex part 2b, the side wall part 43 is formed with a concave part 43a.

  As shown in FIG. 3, the molding substrate 20 is placed on the mounting base 40 and the side walls 42 and 43 are closed, thereby forming a space for molding the wall 2 of the retaining wall concrete block 1. Will be.

A top end stopper 46 that defines the placement position of the molded substrate 20 is formed on the mounting base 40 in contact with the top end 22 of the molded substrate 20.
A substrate placement portion 47 for placing the molded substrate 20 is formed at a position one step below the top end stop portion 46.

FIG. 3 shows a state in which the molded substrate 20 is mounted on the mounting base 40 and the inclined bottom plate molded plate 30 is attached.
As shown in FIG. 4, the inclined bottom plate forming plate 30 includes an inclined bottom plate forming surface portion 31, a wall base forming surface portion 32 for forming the bottom surface portion of the retaining wall concrete block 1, and a pin 33.

  The inclined bottom plate forming surface portion 31 is formed in a substantially trapezoidal shape with the upper end being longer than the lower end. The inclined bottom plate forming plate 30 is attached so that the inner surface of the inclined bottom plate forming surface portion 31 faces the inclined bottom plate forming base portion 23 of the forming substrate 20.

  The pins 33 are respectively formed on both side surfaces of the inclined bottom plate forming plate 30. The inclined bottom plate molding portion 30 is fixed to the molded substrate 20 by the pins 33 being locked by the joining hooks 27 of the molded substrate 20.

  1A and 1B described above with the inclined bottom plate forming base 23, the inclined bottom plate forming frame portion 24, and the inclined bottom plate forming surface portion 31 shown in FIG. A space for forming such a substantially trapezoidal inclined bottom plate 3 is formed.

  As can be seen from the above description, in the concrete block manufacturing form of the present embodiment, the molded substrate 20 is mounted on the mounting base 40 as shown in FIG. 4, and the inclined bottom plate molded plate 30 is attached to the molded substrate 20. Thus, the inner surface side becomes a concrete placement space. A concrete block 1 for retaining walls having the shape shown in FIG. 1 is formed by placing concrete 200 on the concrete block manufacturing formwork and then removing the solidified concrete 200 from the concrete block manufacturing formwork.

<3. Construction method of concrete block for retaining wall>
Next, a construction method for installing the retaining wall concrete block 1 formed using the concrete block manufacturing form 10 (retaining wall concrete block manufacturing form) as described above will be described with reference to the accompanying drawings. To do.

In constructing the retaining wall concrete block 1, as shown in FIG. 6A, a foundation 80 is formed (foundation forming process), and the bottom surface of the wall portion 2 of the retaining wall concrete block 1 is placed on the foundation 80 concrete. Block 1 is installed (installation process). At this time, a space 300 is formed between the inclined bottom plate portion 3 and the foundation 80. The foundation 80 is formed by driving concrete into the soil in order to place the retaining wall concrete block 1. Then, as shown in FIG. 2B, a plurality of retaining wall concrete blocks 1 are similarly arranged side by side.
It is also conceivable to provide the foundation 80 with a recess 80a or a protrusion 80b. For example, the retaining wall concrete block 1 is provided by providing a concave portion 80a in which the bottom surface of the wall portion 2 is fitted as shown in FIG. 6D and a convex portion 80b in contact with the back surface of the wall portion 2 as shown in FIG. 6E. It becomes possible to position easily when installing.

Next, as shown in FIG. 6B, concrete 200 is placed from the side surface of the inclined bottom plate portion 3 in a space 300 formed between the inclined bottom plate portion 3 and the foundation 80 (placement step). That is, as shown in FIG. 2B, when installing a plurality of retaining wall concrete blocks 1, the concrete 200 is placed from a gap generated between the inclined bottom plate portions 3 of the adjacent retaining wall concrete blocks 1. The gap is generated because the inclined bottom plate portion 3 is formed in a substantially trapezoidal shape with the rear edge as a short side.
By placing the concrete 200 in the space 300 from the side surface of the inclined bottom plate portion 3, it is not necessary to provide a special injection hole in the inclined bottom plate portion 3. In addition, when pouring the concrete 200 into the entire space 300, by placing the concrete 200 from the side surface of the inclined bottom plate portion 3, at least the lower side on both sides of the inclined bottom plate portion 3 can be reliably filled with the concrete 200. . That is, both ends in the left-right direction of the retaining wall concrete block 1 are reinforced by the concrete 200, and the stability of the retaining wall concrete block 1 becomes strong. Further, by placing the concrete 200 from the side, the concrete 200 can be placed while visually recognizing. That is, it can be easily recognized whether the concrete 200 has been sufficiently placed, and the concrete 200 can be placed on both ends of the retaining wall concrete block 1 more reliably.

  As shown in FIG. 6C, the space 200 is filled with concrete 200 and then solidified. Then, the construction of the retaining wall concrete block 1 is completed by retaining the earth by placing the embankment 101 on the upper surface of the inclined bottom plate 3 with respect to the arranged retaining wall concrete block 1 (filling process). .

As shown in FIG. 7B, a gap 400 is provided between the surface of the filled concrete 200 and the bottom surface of the inclined bottom plate portion 3 in advance after molding the retaining wall concrete block 1, and an anti-adhesive agent is applied to the bottom surface of the inclined bottom plate portion 3. Application is also conceivable (adhesion prevention step). By preventing the concrete 200 and the inclined bottom plate portion 3 from adhering to each other, the retaining wall concrete block 1 can be moved separately from the concrete block 200 and the foundation 80. Thereby, when the ground 100 and the foundation 80 vibrate due to an earthquake or the like, the retaining wall concrete block 1 does not vibrate integrally with the foundation 80, and the force applied in the front-rear direction of the retaining wall concrete block 1 is reduced. It can be swept away, and tilting of the retaining wall concrete block 1 can be prevented.
Even if the retaining wall concrete block 1 vibrates separately without being integrated with the foundation 80, the retaining wall concrete block 1 has the above-described high heel shape (see FIG. 2A), and therefore, due to the vertical vibration of the earthquake. Even when the retaining wall concrete block 1 floats, the concrete block 200 can be fitted to the triangular bottom surface of the retaining wall concrete block 1 to return to the original position. Therefore, the seismic resistance of the retaining wall can be improved by installing so that the concrete 200 does not adhere to the bottom surface of the retaining wall concrete block 1 having a high heel shape.

<4. Second Embodiment of Construction Method of Retaining Wall Concrete Block>
Next, a second embodiment of the method for constructing the retaining wall concrete block will be described with reference to FIGS. 7 and 8, the same components as those in FIGS. 1 to 6 are denoted by the same reference numerals, and description thereof is omitted.

  In the construction of the retaining wall concrete block 1 according to the second embodiment, as shown in FIG. 8A, a reinforcing portion 70 that protrudes from the surface of the foundation 80 is provided in the foundation forming step of making the foundation 80. The reinforcing part 70 is, for example, a reinforcing bar.

  Next, as shown in FIG. 8B, concrete 200 is placed from the side surface of the inclined bottom plate portion 3 in a space 300 formed between the inclined bottom plate portion 3 and the foundation 80 (placement step). The tensile strength of the concrete can be compensated by integrating the reinforcing portion 70 (rebar) provided on the foundation 80 with the concrete 200 to be injected. That is, since the high-strength concrete 200 is provided in the space 300, the retaining wall concrete block 1 can be prevented from sliding or tilting in the front-rear direction. The tensile strength refers to a limit strength that can withstand without tearing when concrete or the like is pulled in a certain direction.

Subsequently, as shown in FIG. 8C, the space 200 is filled with concrete 200 and then solidified. Then, the earth retaining 101 is made by placing the embankment 101 on the upper surface of the inclined bottom plate 3 with respect to the arranged concrete block 1 for retaining walls (filling process).
In the present embodiment, the reinforcing portion 70 protrudes from the surface of the foundation 80. However, as shown in FIG. 7A, the connecting reinforcing portions 71 are inserted into the plurality of protruding reinforcing portions 70. Also good. The connection reinforcement part 71 is a reinforcing bar, for example. By providing the connection reinforcing part 71, the foundation 80 provided with the reinforcing part 70 and the concrete 200 are firmly coupled.
Moreover, although the reinforcing bar as shown to FIG. 7A was mentioned as an example as the connection reinforcement part 71, the reinforcing bar may be formed in mesh shape (wire net shape). By using a reinforcing bar mesh (welded wire mesh), the labor of installing each reinforcing bar can be saved, and the construction process can be reduced and the efficiency can be improved. Further, the use of the reinforcing bar mesh can eliminate the disturbance of the bar arrangement, and the processing accuracy can be improved.

<5. Third Embodiment of Construction Method for Retaining Wall Concrete Block>
Next, a third embodiment of the method for constructing the retaining wall concrete block will be described with reference to FIGS. 9 to 12, the same components as those in FIGS. 1 to 8 are denoted by the same reference numerals, and description thereof is omitted.

[5-1. Retaining wall concrete block configuration]
In addition to the above-described configuration, the inclined bottom plate portion 3 has injection holes 3a and 3b penetrating in the vertical direction at the front end portion of the inclined bottom plate portion 3, as shown in FIG. As shown in FIG. 9B, the injection holes 3a and 3b are provided symmetrically with the reinforcing rib 4 in between, and when the retaining wall concrete block 1 is installed as shown in FIG. It is. By providing the injection holes 3 a and 3 b on both the left and right sides of the reinforcing rib 4, the concrete 200 is evenly distributed in the space 300 when the concrete 200 is injected.
In this embodiment, the injection holes 3a and 3b are positioned symmetrically with the reinforcing rib 4 interposed therebetween. However, the positions of the injection holes 3a and 3b are not necessarily symmetrical with the reinforcing rib 4 interposed therebetween. However, any position may be used as long as it is provided at a position where concrete can be poured. In the present embodiment, two injection holes are provided, but the number of injection holes may be one, or may be three or more.

[5-2. Structure of concrete block manufacturing form for retaining wall]
In addition to the above-described configuration, the inclined bottom plate forming surface portion 31 of the inclined bottom plate forming plate 30 has injection hole forming convex portions 31a on both left and right ends of the upper portion so as to straddle the reinforcing rib frame portion 25, as shown in FIG. 31b is formed. In order to form the injection holes 3a and 3b, the inclined bottom plate forming surface portion 31 is formed with injection hole forming convex portions 31a and 31b.
The injection hole forming convex portions 31a and 31b are formed according to the positions of the injection holes 3a and 3b. In the present embodiment, the injection hole forming convex portions 31 a and 31 b are formed integrally with the inclined bottom plate forming surface portion 31. However, the injection hole forming convex portions 31 a and 31 b are formed with the inclined bottom plate forming surface portion 31. You may form as another attachment member.

  As can be seen from the above description, in the concrete block manufacturing form of the present embodiment, the molded substrate 20 is mounted on the mounting base 40 as shown in FIG. 11, and the inclined bottom plate molded plate 30 is attached to the molded substrate 20. Thus, the inner surface side becomes a concrete placement space. The concrete block for retaining walls having the injection holes 3a and 3b having the shape shown in FIG. 9 is obtained by placing the concrete 200 on the concrete block manufacturing formwork and then taking out the solidified concrete 200 from the concrete block manufacturing formwork. 1 is molded.

[5-3. Retaining wall concrete block construction method]
Next, a construction method for installing the retaining wall concrete block 1 formed using the concrete block manufacturing form 10 (retaining wall concrete block manufacturing form) as described above will be described with reference to the accompanying drawings. To do.

  In the construction of the retaining wall concrete block 1, as shown in FIG. 12A, a foundation 80 having a reinforcing portion is formed (foundation forming step), and the wall portion 2 of the retaining wall concrete block 1 is installed on the foundation 80. (Installation process).

  Next, as shown in FIG. 12B, concrete 200 is placed from the side surface of the inclined bottom plate portion 3 in a space 300 formed between the inclined bottom plate portion 3 and the foundation 80 (placement step). That is, as shown in FIG. 2B, when installing a plurality of retaining wall concrete blocks 1, the concrete 200 is placed from a gap generated between the inclined bottom plate portions 3 of the adjacent retaining wall concrete blocks 1.

  After the placing step, as shown in FIG. 12C, concrete 200 is poured from the injection holes 3a and 3b (placement step). By placing the concrete 200 not only from the side surface of the retaining wall concrete block 1 but also from the injection holes 3a and 3b, the concrete 200 can be reliably placed in a space that could not be placed from the side surface. it can. Moreover, it becomes easy to inject | pour the concrete 200 so that the reinforcing bar which is the reinforcement part 70 may be hidden. That is, a sufficient cover thickness can be obtained for the reinforcing bars, and the reinforcing bars can be protected from oxidation. This is advantageous in that it can prevent salt damage to the rebar (particularly damage to structures due to salt) in areas close to the sea.

  After the placing step, as shown in FIG. 12D, the space 200 is filled with concrete 200 and then solidified. Thereafter, the embankment 101 is placed on the upper surface of the inclined bottom plate 3 with respect to the retaining wall concrete block 1, thereby completing the construction of the retaining wall concrete block 1 (filling step).

<5. Modification>
Then, the modification of the concrete block 1 for retaining walls is demonstrated. In FIG. 13 to FIG. 16, the same components as those in FIG. 1 to FIG.

As shown in FIGS. 13A and 13B, the retaining wall concrete block 1 may have cut portions 3 c on both side surfaces of the inclined bottom plate portion 3. The cut portion 3c has a cut surface formed on a spherical surface.
When constructing the retaining wall concrete block 1, the concrete 200 is placed in the space 300 through the notch 3 c in the first placing step. Since the cut surface of the cut portion 3c is formed on the spherical surface, the concrete placing hose can be easily inserted into the space 300, and the space 200 can be more reliably filled with the concrete 200.
In the present embodiment, the cut portions 3c are provided on both side surfaces of the inclined bottom plate portion 3, but the cut portions may be provided in any manner as long as the concrete 200 can be poured into the space 300. The notches 3c may be provided only on one side surface, or two or more incisions may be provided on both side surfaces. Further, as for the shape of the cut portion 3c, if the concrete 200 can be poured into the space 300, it is an arcuate cut cut so as to penetrate the inclined bottom plate portion 3 as shown in FIGS. 14A and 14B in the vertical direction. Alternatively, it may be a rectangular or triangular cut.

  As shown in FIG. 15A and FIG. 15B, the retaining wall concrete block 1 is provided with a thickness at the upper part when the strength of the thinned portion provided by the cut portion 3 c of the inclined bottom plate portion 3 is insufficient. It is good as well. Thereby, the intensity | strength of the part which became thin by providing the notch part 3c can be supplemented. That is, the strength of the concrete block 1 for retaining walls can be maintained while ensuring the convenience that the concrete 200 can be filled from the side.

On the bottom surface of the inclined bottom plate 3, as shown in FIG. 16, a plurality of triangular concave and convex portions 3d as viewed from the side surface may be formed at a predetermined pitch. As shown in FIG. 16, the concavo-convex portion 3 d is formed so that the depth h of the groove formed by the concavo-convex portion is shallower than half the thickness H of the inclined bottom plate portion 3.
Thereby, the constant thickness of concrete is maintained also in the part in which the recessed part of the inclination bottom plate part 3 was formed. That is, the strength of the concrete block 1 for retaining walls can be further improved by strengthening the meshing between the uneven portion 3d and the soil while maintaining the strength of the inclined bottom plate portion 3 itself.
The tip of the inclined bottom plate 3 is formed so as to be positioned below the bottom surface of the wall 2 when the retaining wall concrete block 1 is installed. This increases the contact area between the upper surface of the inclined bottom plate portion 3 and the embankment during earth retaining, and the engagement between the soil and the uneven portion is further strengthened.
In addition, although the unevenness | corrugation is formed in the uneven | corrugated | grooved part 3d with a uniform pitch, if the unevenness | corrugation can be confirmed, the width | variety of an unevenness | corrugation will not be restricted to an equal thing, and may be irregular.
<6. Summary>
In the above embodiment, the following effects can be obtained. The concrete block construction method for a retaining wall according to the embodiment adopts a configuration as shown in FIGS.

A concrete block construction method for a retaining wall according to the present invention is a construction method of a concrete block 1 for a retaining wall comprising a wall portion 2 and an inclined bottom plate portion 3 having a downward slope continuous with a lower portion of the wall portion 2. A space formed between the foundation forming step for forming the foundation 80 for installing the concrete block 1 for use, the installation step for installing the concrete block 1 for retaining walls on the foundation 80, and the inclined bottom plate portion 3 and the foundation 80. It includes at least a placing step of placing the concrete 200 on the side surface of the inclined bottom plate portion 3 on the 300 and a filling step of filling the top surface of the inclined bottom plate portion 3 with the fill 101.
By placing the concrete 200 in the space 300 formed between the inclined bottom plate portion 3 and the foundation 80, at least both side surfaces of the inclined bottom plate portion 3 can be filled with the concrete 200 without a gap.
Therefore, according to the present invention, stability is increased when the retaining wall concrete block 1 is installed before the earth retaining, and the subsequent earth retaining can be easily performed. In addition, since the foundation 80 is firmly bonded to the concrete 200 after the construction, the high heel shape of the retaining wall concrete block 1 can be easily fixed to the concrete 200, and the retaining wall concrete block 1 is stabilized. And the phenomenon of sliding, tilting, settling and the like can be prevented.
As a result, it is possible to prevent an accident due to sliding or tilting of the retaining wall concrete block 1 during construction, and a safe construction work is possible. In addition, it is possible to prevent secondary disasters that may occur when a disaster occurs after construction, or unexpected accidents due to aging.

Further, in the retaining wall concrete block construction method, in the foundation forming step, the foundation 80 to be formed may have a reinforcing portion 70 protruding from the surface.
Since the foundation 80 has the reinforcing portion 70 protruding from the surface, when the concrete 200 is placed in the space 300 formed between the inclined bottom plate portion 3 and the foundation 80, the concrete 200 is also coupled to the reinforcing portion 70. To do.
By having the protruding reinforcing portion 70, the contact area between the foundation 80 and the concrete 200 increases, so that the concrete 200 and the foundation 80 can be more firmly integrated. That is, it is possible to prevent the retaining wall concrete block 1 from sliding or tilting in the front-rear direction.
Moreover, by providing the reinforcing part 70 in the concrete 200, the tensile strength of the concrete 200 can be supplemented and a stronger bond can be achieved.
Furthermore, since the concrete 200 can be prevented from being broken by drying or shrinkage, the retaining wall concrete block 1 can be more firmly fixed to the foundation 80 via the concrete 200.

In the concrete block construction method for retaining walls, it is conceivable that the inclined bottom plate portion 3 is formed in a substantially trapezoidal shape in which the width of the front edge in the left-right direction is longer than the width of the rear edge in the left-right direction.
For example, when installing a plurality of retaining wall concrete blocks 1, a certain gap can be secured between the inclined bottom plate portions 3 of the adjacent retaining wall concrete blocks 1.
Therefore, by ensuring the certain gap, the concrete 200 can be reliably placed from the side surface of the inclined bottom plate portion 3 in the space 300 formed below the inclined bottom plate portion 3 in the placing step. it can.

In addition, in the concrete block construction method for retaining walls, it is conceivable that the inclined bottom plate portion 3 is provided with the cut portion 3c on the side surface, and the concrete 200 is placed from the cut portion 3c in the placing step.
By providing a cut in the inclined bottom plate portion 3, the concrete 200 is placed from the cut.
Therefore, the concrete 200 can be more reliably placed in the space 300 formed between the inclined bottom plate portion 3 and the foundation 80 from the cut portion 3c. That is, since the concrete 200 can be placed in the space 300 without a gap, the retaining wall concrete block 1 and the foundation 80 can be more firmly coupled.
Moreover, when it has the reinforcement part 70 which protrudes from the surface in the foundation 80, for example, when the reinforcement part 70 is a reinforcing bar, if the covering of the concrete is inadequate to the reinforcing bar, the reinforcing bar will be oxidized, and the concrete 200 The strength will be significantly reduced. Therefore, the covering thickness can be ensured by placing the concrete 200 more reliably as described above. That is, since the concrete 200 is strongly alkaline, the reinforcing bars can be protected from oxidation.
The cover thickness refers to the shortest distance from the reinforcing bar to the surface of the concrete 200.

In the concrete block construction method for retaining walls, the inclined bottom plate portion 3 is provided with the injection holes 3a and 3b on the upper surface, and the placing step further includes a step of placing the concrete 200 from the injection holes 3a and 3b. It is done.
The concrete 200 can be placed in the space 300 that could not be filled in the placing step of pouring the concrete 200 from the side surface of the inclined bottom plate portion 3.
Therefore, by placing the concrete 200 not only from the side surface of the retaining wall concrete block 1 but also from the injection holes 3a and 3b, the concrete 200 can be reliably placed in the space 300 that could not be placed from the side surface. can do. Moreover, when the foundation 80 has the reinforcing bar which is the reinforcement part 70, it becomes easy to inject | pour the concrete 200 so that the said reinforcing bar may be hidden. That is, a sufficient cover thickness can be obtained for the reinforcing bars, and the reinforcing bars can be protected from oxidation. This is advantageous in that it can prevent salt damage to the rebar (particularly damage to structures due to salt) in areas close to the sea.

In the concrete block construction method for retaining walls, it is conceivable that the uneven portion 3 d is formed on the bottom surface of the inclined bottom plate portion 3.
The wall portion 2 is firmly supported by continuing the inclined bottom plate portion 3 having a downward slope on the back surface of the wall portion 2. In addition, since the uneven portion 3d is formed on the bottom surface of the inclined bottom plate portion 3, the meshing with the soil is strengthened and the contact area is increased when retaining the soil.
Therefore, the strength of the retaining wall concrete block 1 can be improved. In addition, since the meshing with the soil is strengthened, the stability of the retaining wall concrete block 1 is increased, and phenomena such as sliding, tilting, and settling can be prevented.

In the retaining wall concrete block construction method, the retaining wall concrete block 1 includes reinforcing ribs 4 having tapered holes 4a and 4b formed from the wall portion 2 to the inclined bottom plate portion 3, and a connecting member 90 is provided in the tapered holes 4a and 4b. It is conceivable to have a connecting step of connecting a plurality of retaining wall concrete blocks 1 by insertion.
The connection as a whole of the plurality of retaining wall concrete blocks 1 is strengthened by inserting the connecting member 90 into the tapered holes 4a and 4b.
Therefore, it is possible to prevent an accident due to sliding or tilting of the retaining wall concrete block 1 during construction and to perform safe construction work. In addition, it is possible to prevent secondary disasters that may occur when a disaster occurs after construction, and unexpected accidents due to aging.

  Finally, the description of each embodiment described above is an example of the present invention, and the present invention is not limited to the above-described embodiment. For this reason, it is a matter of course that various modifications other than the above-described embodiments can be made according to the design and the like as long as they do not depart from the technical idea according to the present invention.

DESCRIPTION OF SYMBOLS 1 ... Retaining wall concrete block, 2 ... Wall part, 3 ... Inclined bottom board part, 3a, 3b ... Injection hole, 3c ... Notch part, 3d ... Uneven part, 4 ... Reinforcement part, 4a, 4b ... Tapered hole, 70 ... Reinforcement part, 80 ... Foundation, 90 ... Connecting member, 101 ... Fill, 200 ... Concrete, 300 ... Space

Retaining wall concrete blocks construction method according to the present invention, the wall section and construction method for constructing the retaining wall concrete blocks having an inclined bottom plate portion of the down slope which is extended by a predetermined length from the upper position from the lower end of the wall portion A foundation forming step for forming a foundation for installing the bottom surface of the wall portion of the retaining wall concrete block , and an installation for installing the bottom surface of the wall portion of the retaining wall concrete block on the foundation A step of placing concrete from a side surface of the inclined bottom plate portion in a space formed between the inclined bottom plate portion and the foundation, and a filling step of filling the upper surface of the inclined bottom plate portion. At least.
By placing concrete in a space formed between the inclined bottom plate portion and the foundation, at least both side surfaces of the inclined bottom plate portion can be filled with concrete without a gap.

Retaining wall concrete blocks construction method described above, in the basic forming step, said base forming is have a reinforcing portion projecting from the surface, in the installation process, between the foundation and the inclined bottom plate The retaining wall concrete block is installed so that the reinforcing part is disposed in the vicinity of the wall part of the formed space, and the reinforcing part is embedded in the concrete in the placing step. It is possible.
Since the foundation has the reinforcing portion protruding from the surface, when the concrete is placed in the space formed between the inclined bottom plate portion and the foundation, the concrete is also bonded to the reinforcing portion.
Further, the retaining wall concrete block construction method described above has a plurality of reinforcing portions in the width direction of the wall portion in the foundation forming step, and has a connecting reinforcing portion that connects the plurality of reinforcing portions. In the placing step, it is conceivable that the reinforcing portion and the connecting reinforcing portion are embedded in the concrete.

  Further, the retaining wall concrete block construction method according to the present invention is a construction of a retaining wall concrete block comprising a wall portion and an inclined bottom plate portion having a downward slope extending from an upper position by a predetermined length from a lower end of the wall portion. It is a method, Comprising: The foundation formation process which forms the foundation for installing the bottom face of the said wall part of the said concrete block for retaining walls, The said bottom face of the said wall part of the said concrete block for retaining walls is installed in the said foundation An installation step, a placing step of placing concrete from a side surface of the inclined bottom plate portion in a space formed between the inclined bottom plate portion and the foundation, and a filling step of filling the upper surface of the inclined bottom plate portion. A cut portion is provided in a part of the side surface of the inclined bottom plate portion in the vicinity of the wall portion, and in the placing step, concrete is introduced into the space from the cut portion. It is intended to set.
  By providing a cut in the inclined bottom plate portion, concrete is cast from the cut.

In the concrete block construction method for retaining walls described above, it is conceivable that the inclined bottom plate portion is formed in a substantially trapezoidal shape in which the width of the front edge in the left-right direction is longer than the width of the rear edge in the left-right direction.
  For example, when installing a plurality of retaining wall concrete blocks, a certain gap can be secured between the inclined bottom plate portions of the adjacent retaining wall concrete blocks.

Claims (7)

A method for constructing a retaining wall concrete block comprising a wall portion and a downwardly inclined sloped bottom plate portion continuous with the lower portion of the wall portion,
A foundation forming step for forming a foundation for installing the retaining wall concrete block;
An installation process for installing the retaining wall concrete block on the foundation;
A placing step of placing concrete from a side surface of the inclined bottom plate portion in a space formed between the inclined bottom plate portion and the foundation;
A filling step of filling the upper surface of the inclined bottom plate portion,
A concrete block construction method for retaining walls at least. The method for constructing a retaining wall concrete block according to claim 1, wherein in the foundation forming step, the foundation to be formed has a reinforcing portion protruding from a surface. The method for constructing a retaining wall concrete block according to claim 1 or 2, wherein the inclined bottom plate portion is formed in a substantially trapezoidal shape in which a width in the left-right direction of the front edge is longer than a width in the left-right direction of the rear edge. The inclined bottom plate portion is provided with a cut portion on the side surface,
The concrete block construction method for retaining walls according to any one of claims 1 to 3, wherein in the placing step, concrete is placed from the cut portion. The inclined bottom plate portion is provided with an injection hole on the upper surface,
The concrete block construction method for retaining walls according to any one of claims 1 to 4, further comprising placing concrete from the injection hole in the placing step. The method for constructing a retaining wall concrete block according to any one of claims 1 to 5, wherein an uneven portion is formed on a bottom surface of the inclined bottom plate portion. The retaining wall concrete block includes a reinforcing rib having a tapered hole formed from the wall portion to the inclined bottom plate portion,
The method for constructing a retaining wall concrete block according to any one of claims 1 to 6, further comprising a coupling step of coupling a plurality of the retaining wall concrete blocks by inserting a coupling member into the tapered hole.

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