JP2719991B2 - Construction method of slope protection structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for preventing a slope from collapsing, and more particularly to a method for constructing a slope protection structure constructed using precast blocks.

[0002]

2. Description of the Related Art In order to protect a slope, precast concrete blocks are arranged on a ground and fixed to an anchor cast in the ground to give a prestressing force to prevent the ground from rising. The construction method is adopted.

However, the blocks are independent one by one, and even if a plurality of blocks are arranged on the ground, each block is separately subjected to a force to lift the ground.
In other words, when a part of the slope collapses, only the block placed on it tries to suppress the collapse, and the blocks next to it do not function to prevent this collapse. For this reason, it is conceivable to place a connecting block between adjacent blocks to prevent collapse between them, but simply by using a connecting block, it is not possible to sufficiently hold the ground, and It is difficult to say that adjacent blocks are not functioning together to protect the ground if the connection between them is insufficient.

[0004] For this reason, the present applicant has filed a Japanese Patent Application No. Hei.
No. 540 (JP-A-3-161615) has been developed. In the invention, a reinforcing material such as a reinforcing bar is hung between the tips of adjacent blocks, and a box-shaped connecting block is placed between the adjacent blocks, and concrete is poured into the blocks to block the blocks. Is to connect them.

[0005]

[Problems to be solved by the present invention]
An object of the invention according to No. 02540 is to cast concrete into a box-shaped connecting block, and then to apply a prestressing force to an anchor fixing the block. The prestressing force acts directly on the concrete, which is not cast in place and has unreliable quality, via the reinforcing material. If the concrete is not sufficiently hardened, the concrete will crack. In some cases, water penetrated from the cracks and rusted the reinforcing material inside.

Another object of the invention of the prior application is that it is impossible to apply a prestress force until the concrete poured into the connecting block is hardened. If the ground is likely to collapse, it is preferable to apply prestressing force early to hold down the ground, but if the poured concrete is not hardened, it cannot be pulled by the prestressing force, so it will be prestressed until it hardens. Can't give power. In the meantime, there is a danger of collapse of the ground.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems. When a precast block is used, adjacent blocks are extremely effectively integrated to prevent collapse of a slope and to prevent adjacent blocks from being collapsed. It is an object of the present invention to provide a method of constructing a slope protection structure that can be quickly held down between blocks by a prestressing force.

[0008]

The method for constructing a slope protection structure according to the present invention uses a slope protection block made of precast concrete and a connecting block connecting the slope protection blocks. The slope protection block
The center portion and the legs extending in all directions from the center portion have a substantially cross shape. Each leg has a gap that opens to the lower surface. The slope protection blocks are arranged on the ground at appropriate intervals, and a connecting block is placed between the legs of the adjacent slope protection blocks. The connecting block is provided with a groove that is continuous in the length direction and is arranged such that the groove opens upward. Reinforcing material using deformed reinforcing steel or PC steel strands is placed in this groove, and both ends of the reinforcing material pass through holes that open at the ends of the legs of the left and right slope protection blocks. To the inside. A prestressing force is applied to the anchor for fixing the slope protection block, and the block is fixed to the ground, and the connecting block is pressed against the ground by the reinforcing material. A hardening material such as mortar is filled in the gap of the slope protection block and the groove of the connecting block and hardened.

[0009]

[Function] The connecting block placed between the adjacent slope protection blocks can apply a pre-stress force immediately after being installed, so that the collapsed ground can be immediately pressed down and stabilized. Further, the prestressing force acts on the hardened material which is reliable in the quality produced at the factory, and can give a large prestressing force. After the prestressing force is applied to the groove of the connecting block, the hardening material is filled.
Therefore, the prestressing force does not act on the hardened material, so that the hardened material does not break.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to an embodiment shown in the drawings. In the figure, reference numeral 1 denotes a slope protection block made of precast concrete, which comprises a central portion 2 and legs 3 extending from the central portion 2 in all directions. An anchor insertion hole 4 penetrating vertically is formed in the center,
Each leg 3 has a gap 5 penetrating vertically. A desired number of holes 6 penetrate from the tip of each leg 3 toward the cavity 5. In the embodiment shown in FIGS. 1 to 4, two pieces are penetrated, and in the embodiments shown in FIGS. 5 and 6, one piece is penetrated.

The plurality of slope protection blocks 1 as described above are placed on the ground at appropriate intervals so that the tips of the legs 3 face each other. The projecting portion of the anchor 7 that has been previously cast on the ground is protruded from the surface of the ground through the anchor insertion hole 4 in the center portion 2. In the embodiment, a ground anchor using a steel stranded wire as a tensile member is employed as the anchor 7. At this point, the anchor 7 has a force of about 50%
Is pre-stressed to temporarily tension the slope protection block 1.

A connecting block 8 made of precast concrete is placed between the legs 3 of the slope protection block 1.1. The connecting block 8 has a groove 9 that is continuous in the length direction. The number of the grooves 9 is the same as the number of the holes 6 penetrating the tip of the leg 3, and the connecting block 8 is arranged so that the bottom of the grooves 9 and the holes 6 are continuous straight. A reinforcing member 10 is disposed in each of the grooves 9, and the tip of the reinforcing member 10 has a leg 3.
3 through the hole 6 and into the gap 5 of the leg 3. In this embodiment, the reinforcing material 10 is formed by applying a synthetic resin as a rust preventive material 11 around a deformed reinforcing bar having irregularities formed on the peripheral surface. In this state, a prestressing force of about 50% of the design value is applied to the anchor 7 to fix the anchor 7 on the center portion 2 and the slope protection block 1
To the ground. At this time, by pulling the reinforcing member 10 toward the ground by the prestressing force, the connecting block 8 is pressed against the ground and is brought into close contact with the ground surface.

In the above state, the slope protection block 1
Is filled with a hardening material 12 such as mortar and hardened in the groove 9 of the connecting block 8. The hardening material 12 adheres to the reinforcing material 10, and the left and right slope protection blocks 1.1 and the connecting block 8 are effectively integrated. Each of the slope protection blocks 1 is thus made up of the adjacent block 1 and the four leg portions 3.
As shown in FIG. 7, the whole structure becomes a continuous structure like a lattice. As a result, the force acting on one slope protection block 1 can also be received by the surrounding blocks 1, and better protection of the slope can be achieved. In addition, since the gap 5 formed in the leg portion 3 of the slope protection block 1 is open on the lower surface, the hardening material 12 adheres to the unevenness of the ground, so that the block 1 effectively covers the slope. Can be suppressed.

In the above embodiment, the reinforcing material 10 is formed by applying a rust preventive material 11 around a deformed reinforcing bar which is a steel material on the peripheral surface. Steel strands can be used. In addition, a reinforcing material 10 in which these steel materials are passed through a synthetic resin-made corrugated sheath, and a hardening material is filled in a gap between the sheath and the steel material to perform a rust-proof treatment, can also be used. These reinforcing members 10 may be fixed by tightening wedges or the like in the gaps 5 of the leg portions 3 instead of merely leading the left and right ends to the gaps 5.
In addition, reinforcing bars 10 can be connected to the reinforcing member 10 in the gap 5 beforehand.

In the above embodiment, the prestressing force is divided into two parts. However, the prestressing part may be divided into more parts. 100% may be given at a time.

[0016]

The present invention has been made to solve the above-mentioned problems, and has the following effects. Place the connecting block between the legs of the slope protection block, place both ends of the reinforcing material placed in the groove of the connecting block into the hardening material filling hole of the legs, apply a prestress force to the anchor, and add the reinforcing material together with the reinforcing material Adhere the connecting block to the ground. Thereby, the ground can be firmly held down by the connecting block between the slope protection blocks. A precast connecting block is installed with the groove facing upward, and after passing the reinforcement through the groove between the legs of the adjacent block, a prestressing force can be given immediately, not only under the block but also It is possible to stabilize the slope at an early stage by suppressing the slope at the risk of collapse under the connecting block. In addition, there is no need to wait for the curing work period of the hardened material, the construction time can be shortened, and the construction cost can be reduced. Since the hardening material is filled into the groove of the connecting block after the prestressing force is applied, the prestressing force does not act on the hardening material, and the hardening material is not damaged by the prestressing force. A connecting block is placed between adjacent slope protection blocks.By changing the length of the connecting block, the placement position of the slope protection block can be changed at will according to the construction conditions at the site. is there. It is constructed using precast concrete blocks, and does not require any formwork, making construction extremely easy.

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment of a method for installing a slope protection structure according to the present invention.

FIG. 2 is a plan view of a connection state of a slope protection block and a connection block.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a sectional view taken along line BB of FIG. 2;

FIG. 5 is a plan view of another connection state.

FIG. 6 is a sectional view taken along line CC of FIG. 5;

FIG. 7 is a perspective view of the entire structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Slope protection block 2 Center part 3 Leg part 4 Anchor insertion hole 5 Void part 6 Hole 7 Anchor 8 Connecting block 9 Groove 10 Reinforcement material 11 Rust prevention material 12 Hardening material

Claims (1)

(57) [Claims] 1. A slope protection block made of precast concrete, which is formed substantially in a cross shape by a central portion and legs extending in four directions from the central portion and having a void portion opened on a lower surface, is appropriately spaced apart from the ground. A precast concrete connecting block in which a continuous groove in the length direction is recessed between the legs of adjacent slope protection blocks is arranged so that the groove opens upward, and this connecting block Prestressing force is applied to the anchor passing through the slope protection block by passing the reinforcing material placed in the groove of the right and left through the hole opened at the tip of the leg of the slope protection block adjacent to the left and right, and reaching the gap. The slope protection block is pressed against the ground and fixed, and the connecting block is pressed together with the slope protection block through the reinforcing material to the ground. Construction method of slope protection structure which is filled with hardening material in groove of connecting part and connecting block.