JPH11303106A - Precast concrete block retaining wall - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a precast concrete block retaining wall capable of significantly reducing the excavation volume on the hill side (face of slope side) of the retaining wall, and capable of constructing with high efficiency. SOLUTION: By multisteppedly stacking precast concrete blocks, the center of gravity G of the body is dislocated further to the face of slope side than the center S of the load bearing surface of the bottom surface of the retaining wall. Precast concrete blocks whose upper stay length is longer than that of lower block are multisteppedly stacked at least to the position of the center of gravity G so that the center of gravity of the body is dislocated further to the side of face of slope than the center S of the load bearing surface of the retaining wall bottom surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention makes it possible to greatly reduce the excavation volume on the mountain side (slope side) of a retaining wall, for example, where the valley side is vertical and the upper part is a pavement, and the construction efficiency is high. Precast concrete block retaining wall.

[0002]

2. Description of the Related Art When the center of gravity of a skeleton is deviated to the side of the slope from the center of the load supporting surface on the bottom surface of the retaining wall, the frame has a leaning structure, and the amount of excavation from below the slope can be reduced. . For this reason, this construction method has often been adopted in the construction of retaining walls. For example, in Japanese Patent Application Laid-Open No. 3-199532, as shown in FIG. 6, a precast concrete front wall 21 in front of a cut surface 20 and a precast flat plate abutting the cut surface 20 with a backing concrete layer 25 interposed therebetween. The rear wall 22 is fixed to the bottom rear flange 23 of the front wall 21, the lower edge of the rear wall is fastened, the front wall 21 and the rear wall 22 are connected to each other by the center beam 24, and the front wall 21 and the rear wall Fill the space between 22 with the filling material (any or mixture of soil, sand, gravel, crushed stone, concrete, etc.) and the center of gravity of the building
(G) is deflected to the side of the slope from the center (S) of the load supporting surface on the bottom surface of the retaining wall. Also, in Japanese Patent Application Laid-Open No. 7-292691 of the same technical concept, as shown in FIG. 7, all of the skeleton is integrally formed of concrete so that the top surface thickness is larger than the bottom thickness, and the center of gravity of the retaining wall is shifted toward the slope side. It is displaced. The amount of deviation is indicated by L. Each of the above examples has an advantage that a retaining wall can be formed without requiring significant excavation of a slope, and construction such as road construction can be performed. It is said that the construction can be performed with high efficiency especially when constructing a road in a narrow valley.

[0003]

However, the center of gravity of these skeletons is deviated to the side of the slope from the center of the load supporting surface on the bottom of the retaining wall to reduce the amount of excavation on the side of the slope to improve the construction efficiency. Also, for example, if the construction method as shown in JP-A-7-292691, prior to casting concrete, it is necessary to assemble the formwork, or concrete placement is stepwise from the bottom In the case of forming, there are inefficient surfaces such as waiting for the lower concrete to solidify. In some cases, even if the amount of excavation on the slope side is reduced to increase the efficiency of excavation, the construction period cannot be shortened.
Therefore, the present invention relates to a retaining wall construction method in which the center of gravity of the skeleton is deviated to the slope side from the center of the load supporting surface of the retaining wall bottom surface,
The task was to make the construction simpler and more efficient.

[0004]

As a result of examining the above-mentioned problems, the precast concrete block is moved to the position where at least the center of gravity (G) exists. A precast concrete block retaining wall has been developed in which blocks larger than the block length are stacked in multiple stages and the center of gravity of the skeleton is shifted to the slope side from the center (S) of the load supporting surface on the bottom of the retaining wall. The shape, connection structure, and the like of the precast concrete block here are not particularly limited as long as the structure can be stacked in multiple stages. In consideration of ease of handling during manufacture, transportation, and construction, a box type having a vertically penetrating cavity is preferable. In addition, as an embodiment of stacking in multiple stages, an example in which all stages of stacking are stacked in multiple stages where the length of the upper block is larger than the length of the lower block, and a case where the center of gravity exists (hereinafter abbreviated as the center of gravity position) An example of a structure in which blocks whose length is larger than that of the lower block is stacked in multiple stages and those whose upper block length is smaller than that of the lower block is stacked in multiple stages above the center of gravity. Can be. The back surface of the precast concrete block may be inclined along the slope. It is possible to arbitrarily provide a drain hole from the side of the slope or provide a filter material for preventing suction from flowing out of the earth and sand.

[0005]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention, and FIG. 2 is a partial perspective view. As is apparent from these figures, when the precast concrete block retaining wall 1 of the present invention is installed, the original slope 2a is excavated to the slope 2b after excavation.
The amount of excavated soil is very small. This is because the area near the load supporting surface 3 on the bottom surface of the retaining wall is smaller and higher, and is increased toward the slope side (mountain side, right side in FIG. 1). For this purpose, box-type rectangular precast concrete blocks 4a to 4f, which are easy to stack, are sequentially placed on the front block where the upper block has a larger length than the lower block.
(Valley side, left side in FIG. 1) are aligned and stacked in multiple stages, forming a large retaining wall toward the slope side as it goes upward. The foundation block 5 on which the lowermost precast concrete block 4a is mounted is also smaller than half of the case where a conventional retaining wall is constructed.

[0006] Precast concrete blocks 4a-4f
Retaining walls are formed simply by stacking them in sequence, so that the blocks are filled with backfill soil between the slopes 2b while the blocks are properly connected with concrete or connection fittings, and the gaps between the blocks and within the blocks are filled with concrete. Alternatively, a road or the like can be constructed easily and in a short period of time even in a narrow mountain or a valley by filling and filling an upper portion with soil or the like. Since the center of gravity (G) of the skeleton is deviated by L from the center (S) of the load supporting surface on the bottom surface of the retaining wall toward the slope 2b, it becomes a leaning retaining wall and has good stability.

FIGS. 3 to 5 are longitudinal sectional views of another embodiment of the present invention. FIG. 3 shows an example of the load supporting surface 3 on the foundation block 5.
In order from the lower part, the upper block's length is larger than the lower block's weight, and the blocks are stacked in multiple stages (4a to 4e),
Next, the precast concrete blocks 4f to 4i having a smaller length are sequentially piled up toward the upper stage, which is a usual stacking method. Also in this example, the center of gravity (G) of the skeleton is deviated by L from the center (S) of the load supporting surface on the bottom surface of the retaining wall toward the slope 2b. The upper blocks 4e to 4i are further filled with earth and sand, concrete and the like, and the load P acts as the construction proceeds, so that the retaining wall leans more toward the slope 2b. As shown in FIG. 4, while alternately stacking long blocks and short blocks of the upper block (4a to 4e), the center of gravity (G) is substantially the center of gravity (G) of the frame, and the center of the load supporting surface (S ) May be shifted by L toward the slope 2b. In addition, as shown in FIG. 5, the precast concrete blocks 4f to 4f, which are inclined so that the upper part protrudes toward the valley side at the front of the retaining wall (the reverse is also possible), are arranged such that the length of the upper block is lower than that of the lower block. The center of gravity (G) can be displaced by L to the side of the slope 2b from the center (S) of the load supporting surface on the bottom surface of the retaining wall.

[0008]

Since the present invention has the above structure,
The construction method of stacking precast concrete blocks by factory production can reduce the use of cast-in-place concrete and various operations for it. Dangerous work of assembling the formwork can be eliminated, bar arrangement work can be reduced, and safety can be improved. The required area such as road land can be reduced, and the construction period can be shortened. Since the surface of the precast concrete block can be directly used as the retaining wall,
(Surface material and formwork) is not required.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention.

FIG. 2 is a partial perspective view of an embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of another embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of another embodiment of the present invention.

FIG. 5 is a longitudinal sectional view of another embodiment of the present invention.

FIG. 6 is a longitudinal sectional view of a conventional example in which the center of gravity (G) of the skeleton is deviated toward the slope side from the center (S) of the load supporting surface of the bottom surface of the retaining wall.

FIG. 7 is a longitudinal sectional view of another conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Precast concrete block retaining wall of the present invention 2a Original slope 2b Slope after excavation 3 Load supporting surface on bottom of retaining wall 4a-4i Precast concrete block G Center of gravity of building body S Center of load supporting surface on bottom of retaining wall P Load L Deflection amount

Continued on the front page (72) Inventor Takashi Nakamoto 8-6 Nakamachi, Naka-ku, Hiroshima City, Hiroshima Prefecture Inside Fujita Hiroshima Branch Co., Ltd. (72) Inventor Shoichi Morita 8-6 Nakamachi, Naka-ku, Hiroshima City, Hiroshima Prefecture, Ltd. Inside Fujita Hiroshima Branch (72) Inventor Yoji Ikeda 8-6 Nakamachi, Naka-ku, Hiroshima City, Hiroshima Prefecture Inside Fujita Hiroshima Branch (72) Inventor Toshinori Goto 8-6 Nakamachi, Naka-ku, Hiroshima City, Hiroshima Prefecture Fujita Hiroshima Co., Ltd. Inside the branch (72) Inventor Shigemi Sugiuchi 8-6 Nakamachi, Naka-ku, Hiroshima City, Hiroshima Prefecture Inside Fujita Hiroshima Branch Office (72) Mitsuo Ueda 2-6-131 Hikari-cho, Higashi-ku, Hiroshima Hiroshima Prefecture Kyokuto Kogyo Inside (72) Inventor Takeshi Kobayakawa 2-6-1, Hikaricho, Higashi-ku, Hiroshima-shi, Hiroshima Prefecture Within Far East Kogyo Co., Ltd. In-house (72) Inventor Jiro Okamoto 630-1, Kaida, Ochiai-cho, Maniwa-gun, Okayama Prefecture Landes shares House

Claims (2)

[Claims] 1. A precast concrete block holder characterized in that the precast concrete blocks are stacked in multiple stages so that the center of gravity (G) of the skeleton is deviated to the slope side from the center (S) of the load supporting surface on the bottom of the retaining wall. wall. 2. The precast concrete blocks are stacked in multiple stages at least to the position of the center of gravity (G), where the upper block has a larger length than the lower block, and the center of gravity of the skeleton is set to the center of the load supporting surface (S The precast concrete block retaining wall, which is deflected to the side of the slope from ().