JPH0673744A - Retaining wall block - Google Patents

Abstract

PURPOSE:To simplify the execution of works by a method wherein sheathing block bodies are piled up at multistages while approximately horizontal shelf boards are supported rotatably on the rear sides of the block bodies, the horizontal component of earth pressure is reduced and the strength of a retaining wall is ensured. CONSTITUTION:Sheathing block bodies 10 are placed on a footing and connected and unified by bolts 31, etc., while the shafts 22 of shelf boards 20 are put on support sections (u). The blocks 10 at an upper stage are placed so that the support sections (u) are engaged with the upper sections of the shafts 22, and coupled and unified by the bolts 31, etc. The rears of the blocks 10 are filled with back-filling soil. Accordingly, frictional resisting force works to the shelf boards in a surface manner, thus increasing the horizontal strength of the retaining wall, then omitting the placing of expensive back-filling concrete requiring the long term of works.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a retaining wall block used when constructing a retaining wall on a land or mountainous area.

[0002]

2. Description of the Related Art Conventionally, earth retaining blocks have been piled up to form retaining walls for construction of retaining walls for roads and construction for preventing collapse of steep slopes. When a high retaining wall is constructed with the conventional retaining block, the retaining block alone is insufficient in strength against the earth pressure acting on the retaining wall.
Therefore, in such a case, it is indispensable to apply good-quality embankment to the inside or back of the soil retaining block and to place backfill concrete.

[0003]

However, in this case, a large construction period and construction cost are required for placing back-filled concrete. Therefore, an object of the present invention is to provide a retaining wall block that can construct a high retaining wall in a short period of time and at low cost.

[0004]

DISCLOSURE OF THE INVENTION The present invention includes a soil retaining block body that is stacked in multiple stages to form a retaining wall, and is supported on the rear side of the soil retaining block body in a substantially horizontal direction and rotatably supported. And a shelf board to be used as the first structure. In addition, the earth retaining block body that is stacked in multiple stages to form a retaining wall, and the shelf plate that is connected to the rear side of the earth retaining block body in a substantially horizontal direction and that can be moved up and down are the second configuration.

[0005]

According to the above-mentioned first construction, the shelf plate supported substantially horizontally on the back side of the earth retaining block body is laid in the backfill soil. Therefore, the soil and the load on the shelf board act on the shelf board, a part of this is received by the bearing reaction force of the earth retaining block body, and the rest is transmitted to the back-filled soil below the shelf board. . Here, a horizontal force due to earth pressure acts on the upper surface of the shelf plate, but a frictional resistance force in the opposite direction to the above acts on the lower surface of the shelf plate in a planar manner, and the horizontal force exerted on the soil retaining block body is Will be reduced. This relationship is also established for the main body of the soil retaining block of each stage that constitutes the retaining wall, and as a result, the horizontal component of earth pressure over the entire retaining wall is reduced, and the retaining wall has sufficient strength. . Further, since the shelf plate is rotatably supported by the soil retaining block, even when the backfill soil is deformed due to subsidence, the shelf plate follows this and continues to make planar contact with the backfill soil, The frictional resistance is maintained. Therefore,
A stable retaining wall can be constructed even if the backfill concrete is omitted. Next, according to the second configuration, first, the bottommost soil retaining block body is laid on the foundation, and the backfill soil is piled up to the middle height of the bottommost soil retaining block body. Next, the bottom shelf is connected to the back side of the soil retaining block body so as to be able to move up and down, and placed on the backfill soil. Further, the second-stage soil retention block body is laid on the bottommost soil retention block body, and the backfill soil is piled up to the middle height of the second-stage soil retention block body.
As a result, the bottom shelf plate is buried in the backfill soil. Further, the second shelf board is placed on the backfill soil. After that, the above steps are repeated to construct the retaining wall. With this second configuration as well, similar to the above-described first configuration, the horizontal component force of earth pressure can be reduced by the frictional resistance of the shelves, and sufficient strength can be obtained even if the placing of backfill concrete is omitted. You can build a retaining wall with it. Further, according to the second configuration, since the shelf plate can move up and down with respect to the soil retaining block body, the shelf plate does not transmit the vertical component force of the earth pressure acting on the upper surface thereof to the soil retaining block body. The burden on the main body of the soil retaining block can be further reduced.

[0006]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a perspective view of a retaining wall block according to a first embodiment of the present invention, and FIG. 2 is a vertical sectional view showing a retaining wall constructed by the block. In FIG. 1, 10 is a main body of the soil retaining block, 11 is a plate having a surface that faces the upper right of FIG. 1, a convex step 11a is formed at the upper edge of the plate 11, and a lower edge is formed at the lower edge. A concave step 11b having a concave portion having the same shape as the convex portion of the convex step 11a is formed. Therefore, as shown in FIG.
When the upper and lower steps are stacked, the upper convex step 11a and the lower concave step 11b are engaged with each other while being pressed to form a retaining wall. Further, 12 and 13 are ribs which extend rearward along both side edges of the back portion of the plate body 11 and are continuously provided in parallel. Reference numeral 15 is a through hole formed in these ribs 12 and 13. And the adjacent soil retaining block 1
The ribs 12 and 13 of 0 and 10 are brought into contact with each other, the bolt 31 is passed through the through holes 15 and 15, and the nut 3 is attached to the bolt 31.
By screwing 2 together, the adjacent soil retaining block body 1
0 and 10 are connected together. Reference numeral 14 is a rib extending from the central portion of the plate body 11. And
The upper and lower parts of these ribs 12, 13, 14 are provided with semicircular bearing parts u. On the other hand, 20 is a shelf board, and 21 is a back-filling soil B whose upper and lower surfaces are flat.
(See FIG. 2) The soil contact portion, 22 is the soil contact portion 21
Is a shaft whose two front edges 21a are connected to the peripheral surface. The shaft 22 has a diameter slightly smaller than that of the support portion u. At the front edge 21a, the ribs 12,
These ribs 12, 1 are in the positions corresponding to 13, 14,
The notch t is formed avoiding the holes 3 and 14. Reference numeral 23 denotes a circular hole formed in the soil contact portion 21, through which a part of the backfill soil B, moisture or the like can move up and down the shelf plate 20. The retaining wall block according to the present embodiment has the above-mentioned configuration, and the construction procedure will be described next. First, as shown in FIG. 2, the earth retaining block main body 10 is placed on a foundation such as a cobblestone 40 and a leveled concrete 41. Next, as shown by the broken line arrow in FIG. 1, the shaft 22 of the shelf board 20 is attached to the support portion u of the main body 10.
Place on top. Then, as shown by the chain line arrow in FIG. 1, the soil retaining block body 10 is placed so that the support portion u engages with the upper portion of the shaft 22. By repeating such a procedure, as shown in FIG. 2, the shaft 22 is clamped by the upper bearing u and the lower bearing u, and the shelf 20 is rotatably supported with respect to the earth retaining block body 10. To be done. As shown in FIG. 2, in this embodiment, the lower shelf 20 'is longer than the upper shelf 20, that is, the area in contact with the backfill soil B is large. As a result, the frictional resistance of the shelves 20, 20 'is increased or decreased according to the magnitude of the horizontal component of earth pressure to improve the stability of the retaining wall. In this way, by changing the size of the shelf board 20 without changing the shaft 22 and the support portion u, it is possible to deal with any site. Further, by laying the shelf plate 20 in the backfill soil B, it is possible to improve the resistance to earth pressure and the stability of the earth mass sandwiched between the shelf plates 20. in addition,
Since the shelf plate 20 has a flexible structure capable of coping with the deformation of the backfill soil B, even if the backfill soil B is deformed due to subsidence or the like,
It is possible to prevent local destruction inside the retaining wall. In addition,
As for the retaining wall block according to the present means, the earth retaining block only needs to have the shelf plate supported on the earth retaining block body, and various modes of this bearing can be considered, and the retaining wall block is not limited to the illustrated example.

Next, a second embodiment will be described. FIG. 3 is a perspective view of a retaining wall block according to the second embodiment, and FIG. 4 is a vertical sectional view showing a retaining wall constructed by the block. In FIG. 3, 50 is the main body of the soil retaining block, of which 51
Is a plate having a surface facing upward and to the right in FIG.
Reference numeral 3 is a rib that is provided continuously from the back portion of the plate body 51 rearward and in parallel, and the ribs 52 and 53 have protruding portions 52a and 53a that spread to the left and right at the tip end portions thereof. Further, 60 is the overhanging portions 52a, 53 of the earth retaining block body 50.
61 is a shelf board which is vertically connected to a.
Circular holes 62, 63 opened to allow passage of the backfill soil B or the moisture contained in the backfill soil B in the up and down direction, respectively, at the reference positions of the overhang portions 52a, 53a,
It is a connecting portion that is slightly larger in size than the overhanging portions 52a and 53a, and the overhanging portion 52 is provided at the corners of the connecting portions 62 and 63.
Arc-shaped insertion guides 62a and 63a are provided to facilitate insertion into the a and 53a. Therefore, as shown in FIG. 4, the bottom earth retaining block body 50X is laid on the foundation such as the stone 40 and the bottom earth retaining block body 5X is laid down.
Backfill soil B is piled up to the middle height of 0X, and the connecting portions 62, 63 of the lowermost shelf plate 60X are inserted into the overhanging portions 52a, 53a of the lowermost soil retention block body 50X, and the backfill soil B is inserted. The bottom shelf 60X is placed on top. Next, the second-stage soil retaining block body 50Y is laid on the bottommost soil retaining block body 50X, and the back-filling soil B is piled up to the middle of the soil retaining block body 50Y. Place 60Y on the backfill soil B. As a result, the lowermost shelf 60X is sandwiched between the top and bottom by the backfill soil B. Here, the lowermost shelf 60X is different from the lowermost soil retention block body 50X.
Since it is connected so that it can move up and down in the direction of arrow N1, even if the backfill soil B sinks, it slides in the direction of arrow N1 and is constantly in contact with the backfill soil B, and due to its frictional resistance, The horizontal component of earth pressure can be reduced. Also, shelves 60X
The vertical component force of the earth pressure acting on the shelf 60X is not transmitted to the earth retaining block body 50X, because it can be freely moved up and down.

[0008]

According to the present invention, the strength of the retaining wall in the horizontal direction is improved by the frictional resistance force acting on the shelf plate in a plane.
It is possible to omit the placing of backfill concrete, which is expensive and requires a long construction period.

[Brief description of drawings]

FIG. 1 is a perspective view of a retaining wall block according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing an example of construction by a retaining wall block according to the first embodiment of the present invention.

FIG. 3 is a perspective view of a retaining wall block according to a second embodiment of the present invention.

FIG. 4 is a sectional view showing an example of construction by a retaining wall block according to a second embodiment of the present invention.

[Explanation of symbols]

 10 Soil retaining block body 20 Shelf board 50 Soil retaining block body 60 Shelf plate

Claims (2)

[Claims] 1. A soil retaining block body that is stacked in multiple stages to form a retaining wall, and a rear side of the soil retaining block body that faces in a substantially horizontal direction.
And a retaining wall block that is rotatably supported. 2. An earth retaining block body which is stacked in multiple stages to form a retaining wall, and a rear side of the earth retaining block body, which is oriented substantially horizontally.
A retaining wall block having a shelf plate that is vertically movable.