JPH11343622A - Banking construction method, banking structure, and concrete block to be used therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a banking construction method capable of shortly forming a banking structure that is lightweight, sufficiently supportable by a small foundation, and that has a retaining wall excellent in the adhesion with a foam synthetic resin body constituting the banking part. SOLUTION: A banking structure 10 is constituted by a face of slope 70 for forming a banking on the inclined surface of a natural ground or soil upheaval substance, a retaining wall 30 laminated by retaining blocks 31 with a definite interval to the face of slope 70 and inclined rearward as it goes to vertically upward, and a banking part 20 consisting of foam synthetic resin bodies 21 laminated to the nearly upper end position of the retaining wall 30 by laminatedly filling plate-shape or bar-shape foam synthetic resin bodies 21 between the retaining block 31 and the face of slope 70 so as to correspond to the laminated layer of the retaining block 31.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an embankment method using a foamed synthetic resin body, and more particularly, to an embankment construction method for forming an embankment structure formed by laminating a retaining wall block and a foamed synthetic resin body. .

[0002]

2. Description of the Related Art Conventionally, when a retaining wall is constructed for widening a road or constructing a residential area, as shown in FIG. 23, excavation of a ground or a residential area at an angle satisfying the angle of repose to bury a foundation 350 as shown in FIG. A slope 700 is formed, and a retaining wall block 310 is successively laminated on the buried foundation 350 while backfilling the backfill embankment material 220 on the back of the retaining wall block.
00 is being built. In this case, the retaining wall block 3
The back surface of the base material 10 needs to be capable of compacting the backfill embankment material 220. Conventionally, as shown in FIG. Parts or two parts.

On the other hand, when forming an embankment such as a backfill embankment such as a widened embankment, a retaining wall, and a seawall on a soft ground having a small ground support capacity and strength, a lightweight material such as a foamed synthetic resin body is used as the embankment material. The embankment method has been adopted. Among them, foamed polystyrene (EP) is used as the foamed synthetic resin body.
In the EPS method using the block body made of S), the EPS block body as the embankment material has a unit volume weight of about 1/100 of the earth and sand.
Since it is extremely light as 100, it is particularly effective in preventing and stabilizing the ground. In the conventional embankment method using such a lightweight material, for example, in the case of widening embankment, as shown in FIG. 25, a foam synthetic resin molded body 210 is laminated while being sequentially rolled on an inclined surface on which a slope 700 is formed. To form an embankment portion 200, and a foamed synthetic resin molded body 21 on the front surface of the embankment portion 200.
A protective wall 320 made of concrete is provided to prevent damage to the O. 0 and corrosion due to ultraviolet rays.

[0004]

However, when constructing the retaining wall 300 shown in FIG.
A large foundation 350 that directly supports the zero weight is required, and the amount of excavation of the ground for installing the foundation 350 increases, and the road width that can be expanded is naturally limited. Further, in the case of the widening embankment using the foamed synthetic resin molded body 210 shown in FIG. 25, the strength of the protective wall 320 itself is almost nil. Synthetic resin molded body 2
It is necessary that the slope angle of the slope 700 to be leveled prior to laminating 10 has a value considerably smaller than the angle of repose, and there is a problem that the amount of excavation when the slope 700 is formed increases. Further, the protective wall 320 covers the entire surface by molding the front surface of the synthetic resin molded body 210 with concrete after the lamination is completed. There is also a problem that it takes a lot of time and labor for the construction because it is formed by the method.

[0005] The present invention has been made in view of the current situation,
It is intended to provide an embankment construction method that can form an embankment structure having a retaining wall with a lightweight and small foundation that can be sufficiently supported and has excellent adhesion to a foam synthetic resin body constituting an embankment in a short period of time. is there.

[0006]

The inventor of the present invention has made intensive studies to solve the above-mentioned problems. As a result, the present inventor has used a foamed synthetic resin body as an embankment material, and has formed a projecting piece related to the foamed synthetic resin body. By constructing the retaining wall with a plurality of retaining wall blocks provided on the surface side, it is possible to save the labor of forming the concrete wall on site, and for the compaction that was necessary when configuring the retaining wall with the conventional concrete block It has been found that since the earth and sand of the protective wall can be omitted and the weight of the entire protective wall is dispersed in the foamed synthetic resin body by the protruding pieces, a retaining wall that can be sufficiently supported by a small foundation can be formed, and the present invention has been completed. Was.

That is, according to the present invention, a retaining wall block having one or a plurality of projections provided on the back surface of a block main body constituting a wall surface of a retaining wall is laminated on a foundation, and the back surface of the retaining wall block is provided. On the other hand, there is provided an embankment construction method comprising laminating a foamed synthetic resin body made of a single or a plurality of molded bodies in a state in which a retaining wall block side end surface is associated with a protruding piece on the back of the block body. . The embankment in the present invention, normal high embankment, widening embankment, garden land embankment, and also includes backfilling embankment when cutting, such as backfill embankment of retaining wall, widely placed embankment material on the site, It refers to those that perform the work of rolling or filling.

In such an embankment method, a foamed synthetic resin body is used as the embankment material, so that a stable embankment is formed even on soft ground. In addition, since a laminated retaining wall block is employed, the labor of forming a concrete wall on site is omitted. In addition, since the own weight of the retaining wall is dispersed in the foamed synthetic resin body by the projecting piece on the back surface of the retaining wall block main body, the foundation can be small, and the retaining wall can be easily formed even in limited land and The retaining wall reliably receives the lateral pressure from the embankment due to the load.

[0009] The present invention also provides a step of forming a slope on a ground or a raised soil, a step of providing a foundation in front of the slope, and a block body forming a wall surface of a retaining wall on the foundation. A retaining wall block provided with one or more protruding pieces on the back side of the stacking section, with the protruding pieces facing the slope, and between the retaining wall block and the slope, a single or a plurality of pieces. A step of laminating a foamed synthetic resin body composed of a plurality of molded bodies in a state in which the front end face of the retaining wall block side is associated with the protrusion on the back face of the block body and the rear end face side of the slope is in contact with or embedded in the slope. And a step of covering the upper surface of the foamed synthetic resin body at the uppermost stage. Here, the soil raised material means a raised material such as embankment made of earth and sand, residential land, park embankment, garden land embankment, road embankment, railway embankment, and the like.

In such an embankment method, earth and sand on the back side of the retaining wall block is not required, and a part of the weight of the retaining wall is pressed against the foamed synthetic resin body by the projecting piece on the back surface of the retaining wall block. Therefore, the foamed synthetic resin body as the embankment portion reliably supports the earth pressure received on the rear end face. In addition, since the foundation provided as the base of the retaining wall can be small, it is possible to work safely while minimizing the amount of excavation of the ground or the soil raised material for providing the foundation.

Here, if the inclination angle of the slope is set to be substantially equal to or smaller than the angle of repose, earth pressure acting on the foamed synthetic resin body and the retaining wall can be eliminated. Durability is improved.

It is preferable that a means for preventing collapse of the slope is provided on the surface of the slope. Here, as the above-mentioned means, for example, a reinforcing material can be used, or an anchoring method for supporting a retaining member can be used.

[0013] Further, by forming a fitting or engagement structure with the protruding piece on the back surface of the retaining wall block on the end surface of the foamed synthetic resin body on the side of the retaining wall block, the integrity of the retaining wall and the foamed synthetic resin body is improved. As a result, the stability of the embankment structure including the retaining wall and the embankment is improved.

Further, a foamed synthetic resin body inserted between the projecting pieces on the back surface of the retaining wall block and a foamed synthetic resin body having a thickness corresponding to the thickness of the projecting piece are alternately laminated. Is preferred. When such a laminated form is adopted, it is not necessary to process a special shape such as a concave portion on the front surface of the foamed synthetic resin body, so that the length direction of the substantially rectangular parallelepiped foamed synthetic resin body is measured on site. It can be easily constructed simply by cutting.

It is preferable that the retaining wall blocks have uneven shapes so that they can be stacked with each other. According to this, positioning at the time of laminating the retaining wall blocks is facilitated, safety is improved, and integrity of the entire retaining wall is improved.

If a pile foundation is used as the foundation, the retaining wall can be stably supported even on soft ground.

In addition, a communication hole is formed at a position penetrating the stacked retaining wall blocks, and a connecting member is inserted into the communication hole to connect the retaining wall blocks. The blocks are securely fixed, and it is possible to prevent a fall or a collapse caused by carelessness at the time of lamination, and the integrity of the retaining wall is remarkably improved. Here, the connecting member is not limited to the one penetrating only the retaining wall blocks, for example, by penetrating the lowermost retaining wall block and further penetrating the foundation located therebelow. When the fence, guardrail, etc. are provided above the retaining wall, the fence, guardrail, etc. can be connected by extending the retaining wall block located at the top and extending further upward. It may constitute a support. Further, the connection of the retaining wall blocks by the connecting members may be performed by inserting one connecting member after the completion of the stacking operation of the retaining wall blocks and connecting the retaining wall blocks by one or more laminations. It is preferable that the connecting member is composed of a plurality of connectable members, and that the block for the retaining wall can be connected without a break.

Further, a communication hole is formed at a position penetrating the projecting piece of each laminated retaining wall block and the foamed synthetic resin body located at the projecting piece, and a connecting member is inserted into the communication hole so as to form each of the retaining members. If the wall block and the foamed synthetic resin body are connected to each other, the respective retaining wall blocks are securely coupled to the foamed synthetic resin body, and the retaining wall block falls down to the front after stacking the respective retaining wall blocks. The situation described above can be avoided, safety can be improved, and the integrity of the retaining wall and the foamed synthetic resin body can be improved, so that the earth pressure supporting force can be significantly improved. Here, the communication holes provided in the foamed synthetic resin body may be provided before the lamination or may be provided after the lamination. In the case after the lamination, the communication holes may be provided together with the insertion of the connecting member. preferable. As described above, even if the connection by the connecting member is performed by inserting and connecting one connecting member after the completion of the laminating operation, the foaming composite that fits into the retaining wall block and the protruding piece of the retaining wall block. It may be one that is sequentially connected each time a single or a plurality of resin bodies are laminated, and in the case of sequentially connecting, the connection member is configured by a plurality of connectable members,
It is preferable that the projecting piece of the retaining wall block and the foamed synthetic resin body fitted to the projecting piece can be connected without a break.

Further, a communication hole is formed at a position through which each of the laminated foamed synthetic resin bodies can penetrate, and each of the foamed synthetic resin bodies is connected by inserting a connecting member into the communication hole. The integrity of the embankment made of the body is improved, local earth pressure acting on the retaining wall can be avoided, and the collapse of the retaining wall can be prevented. Here, the connection member is not limited to those that only penetrate each foamed synthetic resin body, for example, by penetrating the foamed synthetic resin body located at the lowermost position and penetrating and embedding it on the lower slope surface, It may be one that improves the fixability between the foamed synthetic resin body and the slope and prevents the slope itself from collapsing. Further, as described above, the communication holes provided in the foamed synthetic resin body may be provided before the lamination or may be provided after the lamination. It is preferable to provide them together. Further, the connection by the connecting member may be performed by inserting and connecting one connecting member after completion of the laminating operation of the foamed synthetic resin body. In the case of sequential connection, the connecting member is composed of a plurality of connectable members, and sequentially connects the projecting piece of the retaining wall block and the foamed synthetic resin body fitted to the projecting piece without a break. Those that allow are preferred.

The connection by the connecting member described above is preferably performed by the tension of the PC steel material inserted into the communication hole, or by connecting a reinforcing steel through the through hole and filling and solidifying cement.

It is preferable that the foamed synthetic resin body is connected with a connecting member or an adhesive. This improves the integrity of the foamed synthetic resin body.

In laminating a foamed synthetic resin body composed of a plurality of molded bodies, it is preferable that the connecting portions of the molded bodies are laminated with the upper and lower foamed synthetic resin bodies shifted from each other. By adopting such a laminated state, the connection portion is sandwiched between the foamed synthetic resin bodies positioned above and below, and the integrity of the foamed synthetic resin body laminate is improved.

It is preferable to construct the retaining wall so that the front surface of the retaining wall formed by stacking the retaining wall blocks is slightly inclined rearward. The retaining wall thus formed leans against the embankment portion, which is a laminate of a foamed synthetic resin body, and the weight of the retaining wall dispersed to the embankment portion via the protruding piece of each retaining wall block further increases. As a result, the load acting on the foundation can be suppressed, a small foundation can be adopted, and a stable retaining wall can be provided even in the event of an earthquake or the like, and the safety when stacking the retaining wall blocks is improved.

Further, it is preferable that the front surface of the foamed synthetic resin body abutting from the back surface to the laminated retaining block is formed at an angle which is in close contact with the back surface of the block body. The embankment, which is a laminate of such a foamed synthetic resin body, maintains its adhesion to the retaining wall.

According to the present invention, there is provided a retaining wall formed by stacking a retaining wall block having one or a plurality of protruding pieces on the back surface of a block body constituting a wall surface of the retaining wall on a foundation; On the back side of the wall block, a foamed synthetic resin body composed of a single or a plurality of molded bodies, and an embankment portion laminated with the retaining wall block side end face associated with the protruding piece on the back of the block body. Form an embankment structure. In such an embankment structure, a lightweight embankment material made of a foamed synthetic resin body is used, so even in soft ground, the embankment can be formed stably without sinking the ground, and it is used as a protective wall. The center of gravity of the retaining wall is dispersed in the embankment, making the foundation smaller and supporting earth pressure reliably. Further, since the retaining wall is formed by laminating a plurality of retaining wall blocks, the construction period can be shortened as compared with a case where the retaining wall block is formed on site.

Further, the present invention comprises a foundation provided in front of a slope formed on a ground or a soil protuberance, and one or a plurality of projecting pieces provided on a back surface of a block body constituting a wall surface of a retaining wall. A retaining wall block, a retaining wall configured by stacking on the foundation with the protruding pieces facing the slope, and a single or a plurality of moldings between the retaining wall block and the slope. An embankment structure is formed by embedding a foamed synthetic resin body and an embankment portion in which the front end surface of the retaining wall block side is in contact with or embedded in the slope and laminated. In such an embankment structure, the amount of excavation is reduced in the ground or the raised material, and the construction period is greatly reduced because there is no earth and sand to be compacted on the back of the retaining wall block.

A retaining wall block suitable for the embankment method and the embankment structure described above includes a retaining wall block main body constituting the wall surface of the retaining wall and a protruding piece extending in the left-right length direction protruding from one surface of the main body. Concrete blocks are preferred.
In such a concrete block, since the center of gravity is located rearward with respect to the center axis of the main body, a force tilting rearward around the lower end of the main body is generated, and foam synthesis is performed on the lower surface of the protruding piece extending in the left-right length direction. When the resin body is brought into contact, a surface pressure acts on the foamed synthetic resin body. As a result, the weight of the concrete block is dispersed in the foamed synthetic resin body, and a lightweight and small foundation can be used to support the concrete block. Therefore, when such a concrete block is used, it is possible to configure a stable embankment structure that does not sink the ground even on soft ground.

Here, it is preferable that the protruding piece protrudes from the center position in the height direction of the back surface of the main body, and that the protruding piece protrudes from the upper end or the lower end of the back surface of the main body.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in further detail with reference to the embodiments shown in the accompanying drawings.

FIG. 1 shows a typical embodiment of an embankment structure of the present invention. In the figure, 10 indicates an embankment structure, 20 indicates an embankment portion, 30 indicates a retaining wall, and 70 indicates a slope. Embankment structure 1
Reference numeral 0 denotes a slope 70 formed to form an embankment on the slope of the ground or the soil raised material, and a slope for the retaining wall which is vertically or upwardly inclined at a certain interval from the slope 70 or upward. A retaining wall 30 formed by laminating blocks 31, and a foamed synthetic resin molded body of a plate or a rod laminated between the retaining wall block 31 and the slope 70 corresponding to the lamination of the retaining wall blocks 31. 21 is filled between the retaining wall block 31 and the slope 70 by laminating and filling the foamed synthetic resin molded body 21 up to a substantially upper end position of the retaining wall 30 composed of the retaining wall block 31. It is a structure particularly effective for widening embankment on soft ground.

The embankment portion 20 is formed by pressing a plurality of foamed synthetic resin moldings 21 having a width of about 1000 mm, a length of about 2000 mm, and a height of about 500 mm without any gaps with their connecting portions 29 being vertically shifted. The laminated synthetic resin molded body 21 has a unit volume weight of 0.01 to
A styrofoam block of 0.03 tr / m ³ is used. In particular, when the back surface is a mountain slope or the like, the foamed synthetic resin molded body 21b located on the slope side is pushed rearward or loaded with earth and sand so that the rear end portion is inside the slope 70 satisfying the angle of repose. A stable posture is maintained by being buried. On the front surface of the foamed synthetic resin molded body 21a abutting on the back surface of the retaining wall 30, a concave notch 22 having a substantially horizontal upper surface and a lower surface is formed over the entire width. It is fitted to the protruding piece 32 of the retaining wall block 31 constituting the wall 30. The concave notch 22 is formed by a notch 23 provided on the lower surface of the upper foamed synthetic resin molded article and the upper end of the front face of the lower foamed synthetic resin molded article at the contact portion of the foamed synthetic resin molded articles 21a, 21a connected vertically. The protruding piece 32 of the retaining wall block 31 is firmly held by the pressing force generated at the contact portion.
Here, as shown in FIG. 2, the concave notch 22 may be provided independently on the front surface of each foamed synthetic resin molded body 21a. In this case, the size is slightly smaller than the outer diameter of the protruding piece 32. By doing so, the projecting piece 32 can be firmly held.
In addition, the concave notch 22 of this embodiment is formed by the lower surface of the upper foamed synthetic resin molded body and the cutout 23 of the lower foamed synthetic resin molded body. A notch may be provided and formed by the notch and the upper or lower notch of the lower foamed synthetic resin molded article.

The individual shapes of the foamed synthetic resin molded body 21 constituting the embankment portion 20 and the lamination form thereof are determined by the concave notched portion 22.
Is not particularly limited except that it is related to the shape of the protruding piece 32 on the back surface of the retaining wall block 31, and the following is also a preferred embodiment.

For example, the one shown in FIG. 3 is obtained by sequentially laminating a synthetic resin molded article 21 having a convex portion on the upper surface and having an inverted T-shaped cross section. Thus, each of the foamed synthetic resin molded bodies 21
Are fitted to each other to form the embankment portion 20, so that positioning at the time of work becomes easy, and each of the foamed synthetic resin molded bodies 2
1 have a binding force, the strength of the entire embankment portion 20 is increased, and the earth pressure received by the rear surface of the embankment portion 20 can be dispersed throughout the embankment portion 20. Can be avoided.

Further, as shown in FIG. 4, a foamed synthetic resin molded body 21 having an H-shaped cross section is sequentially laminated, and as shown in FIG. It may be formed by sequentially laminating the foamed synthetic resin molded body 21 having the projections 24 and the projections 25 formed thereon. Here, it is preferable that the concave portion 24 and the convex portion 25 are fitted with a dovetail joint as shown in the figure in order to prevent the detachment.

FIG. 6 is a cross-sectional view of the synthetic resin molded article 21 adjacent in the front-rear direction, the left-right width direction or the height direction.
(A) to (c) fitting each foamed synthetic resin molded body 21 into an opening having a U-shaped cross section through a connecting member 26a, 26b, 26c formed of a thin steel plate having a H-shaped cross section as shown in FIG. Thus, the movement can be restricted without processing each foamed synthetic resin body into a special shape.

Although not shown, a foamed synthetic resin molded article inserted between the projections on the back of the retaining wall block and a foamed synthetic resin molded article having a thickness corresponding to the thickness of the projection are alternately arranged. By laminating, a long foam synthetic resin molded article whose width and height have been adjusted in advance at the factory according to the dimensions of the protruding pieces can be easily cut on site to match the topography etc. And the degree of freedom of design is improved.

Further, as shown in FIG. 7 (a), a communication hole 27 is continuously drilled in the laminated synthetic resin molded article 21, and a connecting member 28 is inserted into the communication hole 27 to form the synthetic resin molded article. What connects the body 21 is also preferable. As such a connecting member 28, a normal connecting means such as a steel rod or a steel wire having a non-slip surface on its outer peripheral surface, or a long bolt screwed into a female screw provided at the bottom of the communication hole 27 can be applied. The communication hole 27 may be filled with an adhesive liquid that solidifies in a short period of time, and solidified. In particular, a concrete member in which a liquid concrete material containing cement is filled into the communication hole 27 and solidified. It may be. in this case,
The concrete member is preferably a reinforced concrete having a reinforcing bar as a reinforcing material, and it is preferable that the lower end of the communication hole 27 has a substantially tapered shape that gradually converges to facilitate centering when the reinforcing bar is inserted in advance. Further, the connecting member 28 is not limited to a member penetrating only the respective foamed synthetic resin molded bodies 21, but, for example, as shown in FIG. It is also a preferred embodiment that the embedding portion 20 and the slope 70 are improved in integration by being penetrated and buried in the lower slope 70 to stabilize the slope 70.

Here, the connecting member 28 is connected to the connecting member 28 shown in FIG.
(A), (b) As shown in FIG.
Is formed of a connectable metal long member 49 provided with a concrete member 43 formed by flowing a material into a gap between the long member 49 and the communication hole 27 and solidifying the long member 49. It has a length that allows two or more foamed synthetic resin molded bodies 21 to penetrate, and has a thread groove 4 at its upper end and lower end, respectively.
A preferred embodiment is provided with a plurality of longitudinal members 41 provided with 1a and 41b and screwing a coupler 42 having female threads at both ends into the screw groove 41a. The connection procedure using such a connection member 28 is as follows. First, a screw groove 41b at the lower end of the longitudinal member 41 is screwed into the bottom of the hole 27a formed in the foamed synthetic resin molded body 21 placed at the bottom. After fixing the foam synthetic resin molded body 21 in advance, the fixing plate 45 having a nut 44 to be formed and a hole 45a welded to the nut 44 and capable of penetrating the longitudinal member 41 is fixed to the foam synthetic resin molded body 21 in advance. The elongated member 41 is inserted into the communication hole 27 and the lower end thereof is screwed to the nut 44. The longitudinal member 41 and the communication hole 27
Is filled with a concrete material and solidified to fix the foamed synthetic resin molded bodies to each other. Thereafter, the coupler 42 screwed into the thread groove 41a of the longitudinal member 41 is regarded as a nut 44, and the foamed synthetic resin is similarly formed. The resin molded bodies 21 are laminated and fixed. Here, each foamed synthetic resin molded body 21
When the shapes of the holes 27a, 27b, and 27c formed in the holes are tapered so that the diameters of the holes 27a, 27b, and 27c are increased downward, the connection member 28 can be prevented from coming off and loosening, and strong connection can be maintained.
Note that the above-described connection using the connecting member 28 can be applied to the connection between the retaining wall 30 and the embankment portion 20 or the connection between the retaining wall blocks 31 constituting the retaining wall 30, for example, as shown in FIG. 9. The connecting member 28 composed of the long member 49 and the concrete member 43 is fitted into the communicating hole 34 continuously drilled in the projecting piece 32 of each retaining wall block 31 and the concave notch 22 of the foamed synthetic resin molded body 21a. Then, retaining wall 30 and embankment 2
Thus, the lamination work of the retaining wall block 31 and the foamed synthetic resin molded body 21 can be performed more safely.

As the connecting member 28, FIG.
It is also a preferred embodiment to use a connectable PC steel rod 59 as shown in FIG. In this case, the PC steel rod 5
9 has a length capable of penetrating two or more foamed synthetic resin molded bodies 21 similarly to the above-described elongated member 49, and has thread grooves 59a and 59b provided at its upper end and lower end, respectively. Fixing plate 6 having a nut 61 and a hole 62a welded to the nut 61 and capable of penetrating the PC steel rod 59.
2 while being fixed to the foamed synthetic resin molded body 21 by using
The fixing nut 63 is fastened and fixed by tightening the fixing nut 63 in a state where the C-steel rod 59 is tensioned. Thereafter, as shown in FIG.
Each time one or a plurality of foamed synthetic resin molded bodies 21 are laminated, the P
The C steel bars 59 are connected, and are similarly tensioned, fixed, and fixed. Here, the lower end portion is fixed in advance to the lowermost foamed synthetic resin molded body using a PC steel stranded wire having a height of a retaining wall, and the foamed synthetic resin molded body is sequentially inserted while the PC steel stranded wire is inserted. After lamination, the PC steel stranded wire is tensioned, fixed and fixed by a center hole hydraulic jack on the uppermost layer of the foamed synthetic resin body, which is also a preferred embodiment. It is also a preferred embodiment to use a lightweight pile made of synthetic resin, particularly polyvinyl chloride, having an outer diameter slightly larger than the maximum inner diameter of the communication hole 27 as the connecting member 28.

Although the above embodiment shows only the connection in the vertical direction between the members, the connection member of the present invention is not limited to this, and it is preferable to use the connection member in the left, right, front and rear directions as appropriate.

The retaining wall 30 is constructed by stacking a retaining wall block 31 on a pile foundation 35 having one or more piles 36 provided on the lower surface side. The retaining wall 30 covers the front surface of the embankment portion 20 made of the foamed synthetic resin molded body 21 without any gap, thereby preventing the foamed synthetic resin molded body 21 from being exposed to the outside air and being damaged or corroded by ultraviolet rays. Preventing. Similarly, on the upper surface of the embankment portion, the upper surface of the embankment is covered by depositing a suitable thickness of earth and sand to prevent contact with the outside air.

The retaining wall block 31 includes a main body 37 constituting the wall surface of the retaining wall 30 and a substantially horizontal plate-like protruding piece 38 protruding rearward from the substantially central position in the height direction of the back surface of the main body 37 over the entire width thereof. The plate-shaped protruding piece 38 is sandwiched by the recess 22 described above. In this way, in the retaining wall block 31 provided with the protruding piece on the rear side, since the force for tilting rearward is generated around the lower end of the main body 37, the concave notch 2 is formed.
2 generates a surface pressure on the lower surface thereof, and the own weight of each retaining wall block 31 is an embankment portion 20 which is an aggregate of a foamed synthetic resin molded body 21.
And the load acting on the foundation 35 is reduced. Therefore, the foundation 35 can be small and lightweight, can form a stable wall surface without sinking the ground even on soft ground, and when filling widening on a slope, satisfying the angle of repose. The amount of excavation on the slope is reduced, and the construction period can be significantly reduced.
Although the main body 37 of the retaining wall block 31 in this embodiment has a vertically upright shape, the present invention is not limited to this, and the main body 37 is inclined rearward, in particular, as shown in FIG. It is also preferable to be inclined 45 ° or less with respect to the rear. In such a retaining wall block 31, the above-mentioned surface pressure is further increased, and a stable embankment structure can be formed while using a lightweight and small foundation. In this case, the front surface of the foamed synthetic resin molded body 21a which comes into contact with the main body 37 from the rear surface is formed at an angle which is in close contact with the rear surface.

The upper end surface and the lower end surface of the body 37 are
As shown in FIG.
2 are formed to prevent the retaining wall blocks 31 vertically adjacent to each other from shifting. here,
As means for preventing the retaining wall blocks from being displaced from each other formed on the upper end surface and the lower end surface of the main body 37, for example, FIG.
As shown in FIG. 13A, the upper and lower surfaces of the main body 37 are provided with inclined portions 53, 53 which are inclined downward toward the rear over the entire width or at a part thereof, or as shown in FIG. The one provided with the stepped portions 54 to be fitted is also preferable. Furthermore, the main body 37 and the foundation 35 of each retaining wall block.
It is also preferable that a communicating hole penetrating through the through hole is continuously formed, and a connecting member is inserted into the communicating hole. In this case, according to the same means as described above, the concrete block is fitted with a connecting member made of a long member and a concrete member into a communication hole continuously drilled in the main body and the foundation of each retaining wall block, thereby making the concrete block 1 The connection can be made surely every time a plurality of layers or several layers are stacked, and the stacking operation can be safely performed.

Further, the retaining wall block 31 according to the present invention.
The protruding piece 32 on the back surface is not limited to the present embodiment, and the one having the following shape is also a preferred embodiment.

FIG. 14 shows a plate-shaped protruding piece 38 whose upper surface forms a horizontal plane and whose lower surface forms an inclined surface, and gradually becomes thicker toward the tip. When stacking the retaining wall block 31 having such a plate-shaped protruding piece 38, the lower surface of the plate-shaped protruding piece 38 is inclined from the lower surface of the recessed portion provided in the foamed synthetic resin molded body toward the embankment portion. Because of the resistance, it is possible to maintain a stable fitting state.

In addition, as shown in FIG. 15, a plate-shaped projecting piece 38 provided with a ridge 55 extending in the left-right direction as shown in FIG. 15 or a plate-shaped projecting piece 38 as shown in FIG. It is also preferable that wedge-shaped protrusions 56, 56 extending in the front-rear direction, which gradually become thicker toward the rear, are provided on the lower surface of.

Further, the positions of the projecting pieces 32 are not particularly limited. For example, as shown in FIG. 17, a plate-like projecting portion 38 projecting from the upper end of the rear surface of the main body 37 is formed by a concave notch of a foamed synthetic resin body. The surface pressure acting on the base 22 is increased, the base 35 can be reduced in weight, and the entire retaining wall can be stabilized.
The width of the protruding piece 32 in the left-right direction is not particularly limited, but at least has a contact area capable of applying a surface pressure to the foamed synthetic resin molded body 21a without deforming the foamed synthetic resin molded body 21a. However, if the condition is satisfied, an intermittent projecting piece is a preferred embodiment. Further, the protruding piece 32 may not be horizontal but may be inclined downward toward the tip,
For example, when the main body 37 of the retaining wall block 31 is inclined backward by 45 degrees or more, the workability can be improved by projecting the projecting piece 32 downward substantially vertically as shown in FIG. .

Projecting piece 3 of retaining wall block 31 according to the present invention
2 is not limited to the above as long as it engages with the foamed synthetic resin molded body 21a adjacent to the main body 37. For example, as shown in FIG. One or two parts are provided, and a communication hole 21c corresponding to the hole 38a provided in the plate-shaped protruding piece 38 is provided laterally on the front surface of the foamed synthetic resin molded body 21a fitted to the retaining wall block 31, The various connection members 2 described above are inserted into the communication holes 21c.
8, the retaining wall block 31 and the foamed synthetic resin molded body 21a may be sequentially fixed.
Further, as shown in FIG. 19B, a steel plate 39 projecting from the back surface of the main body 37 of the retaining wall block 31 and having been subjected to a rust-proofing process is sandwiched between the foamed synthetic resin molded bodies, and a hole 39a provided in the steel plate 39 is formed. It may be connected by various connecting members 28 penetrating.

As such a retaining wall block 31, a plain concrete block made of only concrete, a reinforced concrete block using a reinforcing bar as a reinforcing material, a prestressed concrete block given a compressive stress in advance, or the like is preferable. Also, even when a reinforcing bar is used as a reinforcing material, it is not necessary to embed the reinforcing bar in the entire concrete block. For example, as shown in FIG.
In the case of the retaining wall block 31 having the recesses 52 and the recesses 52, it is preferable that the reinforcing bars 57 are embedded so as to partially reinforce the projections 51 and the recesses 52.

It is preferable that the front surface of the retaining wall 30 is easily adapted to the natural environment. Therefore, the surface of each retaining wall block 31 is covered with stones, slabs, field stones, etc. It is preferable to apply a sheet covering or the like which covers the above.

Next, an embankment method for widening a road or the like by cutting the ground and using a retaining wall block 31 having a plate-shaped projecting piece 38 projecting from the lower end of the main body 37 will be described with reference to FIG.

In the embankment method according to the present invention, the foundation 35 for supporting the retaining wall can be reduced in weight and size, so that when the slope 70 is formed, the amount of excavation of the ground or soil raised material can be reduced, and the retaining wall can be reduced. The construction is characterized in that the labor for rolling the earth and sand on the back surface of the retaining wall block 31 is eliminated, and the embankment structure can be formed only by assembling locally, so that the construction period can be significantly reduced.

First, excavation of a ground or soil raised object is performed with an angle of repose of 60 degrees or less with respect to a place where the foundation 35 is installed, and particularly 45 degrees when safety is required. Then, the slope is formed by leveling. Then, a plurality of piles 36 to be penetrated into the ground from the lower surface are struck at predetermined intervals along the foundation 35 while rolling the foundation 35 at the scheduled position of the retaining wall. On the surface of the slope 70, a retaining member 71 such as a welded wire mesh which has been subjected to a rust-proof treatment as a means for preventing its collapse is fixed by an anchor 72, but the slope surface is coated with various solidifying agents or Injection is also a preferred embodiment.

Next, the foamed synthetic resin molded body 21 is roll-fixed between the slope 70 and the foundation 35 over the entire length of the foundation 35 in the longitudinal direction. Projection 50 provided on the upper surface of 35
The retaining wall blocks 31 are sequentially placed on the base 35 by fitting the plate-shaped protruding pieces 38 into the concave notches 22 provided in the frontmost row of the foamed synthetic resin molded body 21a while fitting the blocks. Here, a nut 46 is fixed to the bottom of the substantially tapered hole 38 a provided on each plate-shaped projecting piece 38 by a fixing plate 47.

Next, after the second layer of the foamed synthetic resin molded body 21 and the second layer of the retaining wall block 31 are completely stacked, the plate-shaped projecting pieces 38, 38 of the upper and lower concrete blocks and the upper and lower foamed synthetic resin molded body 21a are formed. , 21a is inserted into a communication hole 33 having an upper end to which a coupler 40 is attached, and a lower end thereof is screwed to the nut 46. A gap between the long member 48 and the communication hole 33 is formed. Inject cement.
The connecting member 28 allows the retaining wall blocks 31, 31 to be used.
In addition, it is possible to prevent an unexpected situation in which the foamed synthetic resin molded bodies 21a and 21a are combined and the retaining wall block 31 of the second layer falls down.

Thereafter, by repeating this operation, the foamed synthetic resin molded body 21 and the retaining wall block 31 are successively laminated and fixed, and the embankment structure 10 is constructed. Here, each time the foamed synthetic resin molded body 21 is laminated one or more layers one above the other, a rust-proof welded wire mesh or polyethylene,
A mesh member 66 made of a synthetic resin such as polypropylene or polyvinyl chloride is pressed between the foamed synthetic resin molded bodies 21,
The end of the net member 66 on the side of the side of the slope is
By fixing the slope 70, the earth pressure supporting force can be improved and the slope 70 can be prevented from collapsing. Further, a plurality of communication holes 27 penetrating in the vertical direction are provided in the laminated foamed synthetic resin molded bodies 21,.
As 8, the rebar is inserted and the cement flows in and is solidified. By applying various adhesives or fillers to the joint surfaces between the connected members, the bonding between the members can be strengthened and the penetration of moisture can be suppressed, and the foamed synthetic resin molded body 21 can be formed. It is possible to prevent a decrease in strength due to the penetration of moisture into the inside or corrosion of the retaining wall block 31. In addition, a long metal member 48, a nut 46, or the like is used for each connecting member 28, and it is preferable to apply a rust-proof treatment to the surface thereof each time. It is also a preferable embodiment to fill a space between the rear surface of the embankment 20 made of the foamed synthetic resin molded body 21 and the slope 70 with a stone material or the like for drainage.

The embankment method of the present invention described above is not limited to the method of cutting or embankment of the ground or the raised material, and for example, as shown in FIG. It can also be applied to a case where a substantially vertical retaining wall is provided on a high embankment where roads or railways are piled up in this case, and in this case, the foundation can be made smaller and no land width is taken, and a strong supporting force is provided. Can be formed.

[0058]

According to the embankment method of the present invention as described above, a foamed synthetic resin body is used as the embankment material, so that a stable embankment can be formed even on soft ground. In addition, since a laminated-type retaining wall block is employed, labor for forming a concrete wall on site can be omitted. Further, the self-weight of the retaining wall is dispersed in the foamed synthetic resin body by the projecting pieces on the back surface of the retaining wall block main body, so that the foundation can be small, and the retaining wall can be easily formed and loaded even in limited land. Side pressure from the embankment due to weight can be reliably received. Therefore,
In the case of excavating a mountain or soil ridge to provide the foundation, it is possible to work safely while minimizing the excavation amount.

Here, if the inclination angle of the slope is set to be substantially equal to or smaller than the angle of repose, earth pressure acting on the foamed synthetic resin body and the retaining wall can be eliminated. Can be improved in durability.

Further, if means for preventing collapse of the slope is provided on the surface of the slope, the earth pressure acting on the retaining wall can be reduced.

Further, by forming a fitting or engagement structure with the protruding piece on the back surface of the retaining wall block on the retaining wall block side end surface of the foamed synthetic resin body, the integrity of the retaining wall and the foamed synthetic resin body can be improved. And the stability of the embankment structure including the retaining wall and the embankment can be improved.

In addition, if the foamed synthetic resin body inserted between the projecting pieces on the back surface of the retaining wall block and the foamed synthetic resin body having a thickness corresponding to the thickness of the projecting piece are alternately laminated, It is not necessary to process a special shape such as a concave portion on the front surface of the foamed synthetic resin body, and it is possible to easily construct a substantially rectangular parallelepiped foamed synthetic resin body only by measuring its length direction on site and cutting it.

Further, if the retaining wall blocks have uneven shapes so that they can be stacked on each other, positioning when the retaining wall blocks are laminated can be facilitated, safety can be improved, and the entire retaining wall can be improved. The integrity can be improved.

When a pile foundation is used as the foundation, the retaining wall can be stably supported even on soft ground.

Further, a communication hole is formed at a position penetrating vertically between the stacked retaining wall blocks, and a connecting member is inserted into the communication hole to connect the retaining wall blocks. The retaining wall block can be reliably fixed, falling or inadvertently falling or laminating during lamination can be prevented beforehand, and the integrity of the retaining wall can be significantly improved.

Further, a communication hole is formed at a position penetrating the projecting piece of each laminated retaining wall block and the foamed synthetic resin body located at the projecting piece, and a connecting member is inserted into the communication hole so that each of the retaining pieces is inserted. By connecting the wall block and the foamed synthetic resin body, each of the retaining wall blocks can be securely connected to the foamed synthetic resin body, so that after retaining block blocks are stacked, the retaining wall block falls to the front. An unexpected situation can be avoided, safety can be improved, and the integrity of the retaining wall and the foamed synthetic resin body can be improved, so that the earth pressure supporting force can be significantly improved.

Further, a communication hole is formed at a position through which each of the laminated foamed synthetic resin bodies can be penetrated, and each of the foamed synthetic resin bodies is connected by inserting a connecting member into the communication hole. This improves the integrity of the embankment made of, prevents local earth pressure acting on the retaining wall, and prevents collapse of the retaining wall.

The connection by the connecting members described above can be surely performed by connecting by the tension of the PC steel material inserted into the communication hole, or by inserting the reinforcing steel into the through hole and filling and solidifying the cement.

Further, if the foamed synthetic resin body is joined with a connector or an adhesive, the integrity of the foamed synthetic resin body can be further improved.

Further, when laminating a foamed synthetic resin body composed of a plurality of molded bodies, if the connecting parts of the molded bodies are laminated with the upper and lower foamed synthetic resin bodies being shifted from each other, the connecting parts are vertically positioned. Thus, the foamed synthetic resin body is sandwiched between the foamed synthetic resin bodies, thereby improving the integrity of the foamed synthetic resin body laminate.

If the front surface of the retaining wall formed by laminating retaining wall blocks is slightly inclined backward,
The load acting on the foundation can be suppressed, a small foundation can be adopted, and a stable retaining wall can be provided even in the event of an earthquake or the like. Further, the safety when stacking the retaining wall blocks can be improved.

Further, if the front surface of the foamed synthetic resin body which comes into contact with the laminated retaining wall block from the rear surface is formed at an angle which makes close contact with the rear surface of the block body, the adhesion to the retaining wall can be maintained.

According to the embankment structure of the present invention, embankment can be formed stably without softening the ground even on soft ground, and the earth pressure can be reliably supported while reducing the size of the foundation. Further, the construction period is significantly shortened, and costs can be reduced.

Further, when excavating ground or soil raised material and applying it to widening embankment, the amount of excavation can be reduced, and the construction period is greatly reduced because there is no soil to be compacted on the back of the retaining wall block. it can.

Further, according to the concrete block of the present invention, the weight of the concrete block is dispersed in the foamed synthetic resin body, so that a light and small foundation can be adopted. In addition, a stable embankment structure that does not cause the ground to subside can be configured even on soft ground.

[Brief description of the drawings]

FIG. 1 is a simplified sectional view showing a typical embodiment of an embankment structure of the present invention.

FIG. 2 is an explanatory perspective view showing an embodiment in which a concave notch is provided independently on the front surface in the foamed synthetic resin body of the present invention.

FIG. 3 is a simplified cross-sectional view showing a stacked state of an embodiment in which a projection is provided on the upper surface.

FIG. 4 is a simplified cross-sectional view showing a laminated state of the embodiment in which the cross section is also H-shaped.

FIG. 5 is an explanatory perspective view showing an embodiment in which a concave portion and a convex portion that can be fitted to each other are formed on the front surface and the rear surface.

FIGS. 6A to 6C are explanatory perspective views showing a state in which a connecting member made of a thin steel plate having an H-shaped cross section is interposed between foamed synthetic resin bodies.

FIG. 7A is a simplified sectional view showing a connecting member to be inserted into a communication hole of a foamed synthetic resin body. (B) is a simplified cross-sectional view showing a state where a foamed synthetic resin body is connected by the connecting member.

8A and 8B are simplified cross-sectional views showing an embodiment of a connecting member of a foamed synthetic resin body.

FIG. 9 is a simplified cross-sectional view showing a connecting member that is inserted into a communication hole that penetrates a protruding piece of the retaining wall block of the present invention and a recessed portion of the foamed synthetic resin body.

FIGS. 10A and 10B are simplified cross-sectional views showing an embodiment of the connecting member.

FIG. 11 is a simplified sectional view showing an embodiment in which the main body of the retaining wall block according to the present invention is inclined rearward.

FIG. 12 is a simplified explanatory view showing an embodiment in which a protruding portion and a concave portion that can be fitted to each other are formed on the upper end surface and the lower end surface of the main body.

FIG. 13 (a) is a simplified cross-sectional view showing an embodiment in which the upper and lower surfaces of the main body are each provided with an inclined portion which is inclined downward toward the rear over the entire width or a part thereof. FIG. 2B is a simplified cross-sectional view showing an embodiment in which steps are fitted on the upper and lower surfaces of the main body.

FIG. 14 is an explanatory perspective view showing an embodiment in which a plate-shaped protruding piece that gradually becomes thicker toward the tip end is provided by making the upper surface horizontal and the lower surface inclined.

FIG. 15 is an explanatory perspective view showing an embodiment in which a ridge extending in the left-right direction is provided on the lower surface of the plate-shaped projecting piece.

FIG. 16 is an explanatory perspective view showing an embodiment in which a wedge-shaped ridge extending in the front-rear direction, which gradually becomes thicker rearward, is provided on the lower surface of the plate-shaped protruding piece.

FIG. 17 is an explanatory perspective view showing an embodiment in which a plate-shaped projection is provided from the upper end of the back surface of the main body.

FIG. 18 is a simplified cross-sectional view showing an embodiment in which a projecting piece projects downward substantially vertically when the main body is inclined by 45 degrees or more.

FIG. 19A is an explanatory perspective view showing an embodiment in which a plate-shaped projecting piece extending in the vertical direction is provided. (B) is an explanatory perspective view showing an embodiment in which a steel plate is provided from the back of the main body.

FIG. 20 is an explanatory perspective view showing an embodiment in which a reinforcing bar is buried so as to partially reinforce a projection and a recess.

FIG. 21 is a simplified sectional view showing a typical embodiment of the embankment method according to the present invention.

FIG. 22 is a simplified sectional view showing an embodiment of an embankment structure of the present invention.

FIG. 23 is an explanatory view showing a conventional retaining wall and its backfill embankment.

FIG. 24 is a perspective view showing a conventional retaining wall block.

FIG. 25 is an explanatory view of a conventional embankment method using a foamed synthetic resin body.

[Explanation of symbols]

10 Embankment structure 20
Embankment part 21, 21a, 21b Foamed synthetic resin molded body 21
c hole 22 concave notch 23
Notch 24 Concave 25
Convex portions 26a, 26b, 26c Connecting member 27
Communication hole 27a, 27b, 27c Hole 28
Connecting member 29 Connecting part 30
Retaining wall 31 Retaining wall block 32
Projection piece 33 Communication hole 34
Communication hole 35 Foundation 36
Piles 37 Body 38
Plate-shaped protruding piece 38a Hole 39
Steel plate 39a Hole 40
Coupler 41 Long member 41
a, 41b Screw groove 41c Convex part 42
Coupler 43 Concrete member 44
Nut 45 Fixing plate 45
a hole 46 nut 47
Fixing plate 48 Long member 49
Long member 50 Projection 51
Projection 52 Depression 53
Inclined section 54 Step section 55
Ridge 56 Ridge 57
Reinforcing bar 59 PC steel bar 59
a, 59b Thread groove 61 Nut 62
Fixing plate 62a Hole 63
Fixing nut 64 Center hole hydraulic jack 65
Coupler 66 Mesh member 70
Slope 71 Retaining member 72
Anchor 73 Anchor 20
0 Embankment section 210 Foam synthetic resin body 22
0 Backfill embankment material 300 Retaining wall 31
0 Block for retaining wall 320 Protective wall 35
0 Basic 370 Body 38
0 Plate-shaped protruding piece 700 Slope

Claims (22)

[Claims] 1. A block for a retaining wall comprising a block body constituting a wall surface of a retaining wall provided with one or a plurality of protruding pieces on a foundation, and a back side of the block for a retaining wall, A foamed synthetic resin body composed of one or more molded bodies,
An embankment method comprising laminating the retaining wall block side end surface in relation to the projecting piece on the back of the block body. 2. A step of forming a slope on the ground or soil raised, a step of providing a foundation in front of the slope, and a step of forming a slope on the back of a block body constituting a wall surface of a retaining wall. Or a retaining wall block provided with a plurality of protrusions,
While stacking the protruding pieces in a state facing the slope,
Between the retaining wall block and the slope, a foamed synthetic resin body made of a single or a plurality of molded bodies, the retaining wall block side front end face is related to the protrusion on the block body rear surface, and the slope side rear face. An embankment method, comprising: a step of laminating with an end face abutting or buried on a slope, and a step of covering the upper surface of the topmost foamed synthetic resin body. 3. The embankment method according to claim 2, wherein the slope angle of the slope is set to be substantially equal to or smaller than the angle of repose. 4. The embankment method according to claim 2, wherein a means for preventing collapse of the slope is applied to the surface of the slope. 5. The embankment method according to claim 1, wherein a fitting or engagement structure with a projecting piece on the back surface of the retaining wall block is formed on an end surface of the foamed synthetic resin body on the retaining wall block side. 6. A foam synthetic resin body to be inserted between protrusions on the back surface of the retaining wall block, and a foam synthetic resin body having a thickness corresponding to the thickness of the projection are alternately laminated. The embankment method according to 1 or 2. 7. The embankment method according to claim 1, wherein the retaining wall blocks have an uneven shape so as to be stackable with each other. 8. The embankment method according to claim 1, wherein the foundation is a pile foundation. 9. The communication device according to claim 1, wherein a communication hole is formed at a position penetrating each of the stacked retaining wall blocks, and each of the retaining wall blocks is connected by inserting a connecting member into the communication hole. 7
The embankment method described. 10. A communicating hole is formed at a position penetrating the projecting piece of each laminated retaining wall block and the foamed synthetic resin body located at the projecting piece, and a connecting member is inserted into the communicating hole to form each of the retaining members. The embankment method according to claim 1, 2, 5, or 6, wherein the wall block and the foamed synthetic resin body are connected. 11. A communication hole is formed at a position penetrating each of the laminated foamed synthetic resin bodies, and each of the foamed synthetic resin bodies is connected by inserting a connecting member into the communication hole. 5
Or the embankment method according to 6. 12. The embankment method according to claim 9, wherein the connection is performed by a tension of a PC steel material inserted into the communication hole. 13. The embankment method according to claim 9, wherein a reinforcing rod is inserted into the communication hole, and cement is filled and solidified for connection. 14. The embankment method according to claim 1, wherein the foamed synthetic resin body is joined with a connecting tool or an adhesive. 15. When laminating a foamed synthetic resin body composed of a plurality of molded bodies, the connecting portions of the molded bodies are laminated with upper and lower foamed synthetic resin bodies shifted in position from each other.
Or the embankment method described in 2. 16. The embankment method according to claim 1, wherein the retaining wall is formed by laminating retaining wall blocks so that a front surface of the retaining wall is slightly inclined rearward. 17. The foamed synthetic resin body which abuts on the laminated retaining wall block from the rear surface is formed at an angle which makes close contact with the block main body rear surface.
The embankment method described. 18. A retaining wall formed by stacking a retaining wall block having one or a plurality of protrusions on the back surface of a block main body constituting a wall surface of the retaining wall on a foundation, and the retaining wall block. An embankment structure comprising: a foam synthetic resin body made of a single or a plurality of molded bodies, and an embankment portion laminated with the retaining wall block-side end face associated with the protrusion on the back of the block body, on the back side of body. 19. A retaining wall provided with a foundation provided in front of a slope formed on a ground or soil ridge and one or more projecting pieces provided on a back surface of a block body constituting a wall surface of the retaining wall. A block, a retaining wall configured by stacking on the foundation with the protruding pieces facing the slope, and a single or a plurality of molded bodies between the retaining wall block and the slope. An embankment structure comprising: an embankment portion formed by laminating a foamed synthetic resin body in a state in which a retaining wall block-side front end surface is in contact with or buried in a slope surface. 20. A concrete block comprising a block main body constituting a wall surface of a retaining wall and a projecting piece projecting from the rear surface of the main body and extending in the left-right length direction. 21. The concrete block according to claim 20, wherein the projecting piece projects from a substantially central portion in a height direction of a back surface of the main body. 22. The concrete block according to claim 20, wherein the projecting piece projects from an upper end or a lower end of a back surface of the main body.