JP3093593B2 - Slope stabilization method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for stabilizing a slope having excellent adhesion between a concrete block and ground and having an excellent effect of preventing scouring.

[0002]

2. Description of the Related Art As a method of stabilizing a slope of this kind, there are a vegetation method, a method of arranging concrete blocks, and a method of constructing a method frame. Are better.

[0003]

However, the method of constructing a formwork requires a great deal of time and labor to install and assemble the formwork on the slope, and the mortar spraying operation involves danger. .

[0004] On the other hand, in the case of constructing a method frame using a pre-made method frame block, if there is unevenness on the slope, the concrete block is a rigid body which is not easily deformed. Is fixed as it is formed, and there is a problem that the adhesion to the ground is not sufficient. In the case where a gap is formed between the ground and the ground, a scouring phenomenon in which the rainwater flows into the gap and the soil is gradually carried out so that the gap gradually expands becomes a problem. When the concrete block is fixed to the ground by the ground anchor, when the concrete block is in a beam state due to the gap and the member stress is excessive,
Problems such as block destruction occur.

[0005] Therefore, a main object of the present invention is to simplify the construction, and when anchoring with an anchor, the concrete block and the ground are brought into close contact with each other so as to have excellent anchoring properties. It is to propose a slope stabilization method excellent in prevention effect.

[0006]

In order to solve the above-mentioned problems, a first invention is to arrange a large number of concrete blocks having a substantially cross shape in plan view in a regular and adjacent manner on a slope. In the method for stabilizing a slope where the concrete block is anchored, an easily deformable sheet-like elastic body is laminated between the slope and the concrete block according to the uneven shape of the slope. Are adjusted and interposed.

In this case, as the elastic body, it is desirable to use a resin foam or a synthetic rubber-based elastic body and to use a water-impermeable one. It is preferable that the elastic body has a compressive strength of 5% and a compressive strain of 0.5 to 4.0 kgf / cm ² .

On the other hand, according to the second invention, a large number of concrete blocks having a substantially cross shape in a plan view are regularly arranged adjacent to each other on a slope, and the concrete blocks are anchored and anchored on the slope. In the chemical method, before arranging the concrete block, a bag-like body filled with hydraulic powder material in a water-permeable bag is arranged in a concave portion or an uneven portion of the slope, and the installation surface of the concrete block is removed. After flattening, a concrete block is placed and solidified by applying water.

[0009]

According to the present invention, an easily deformable sheet-like elastic body is interposed between the slope and the concrete block while adjusting the number of laminated layers according to the uneven shape of the slope. Before placing the concrete block,
A bag-like body filled with a hydraulic powder material in a water-permeable bag body is arranged in the concave or uneven portion of the slope, and the installation surface of the concrete block is flattened. Thereby, especially, even when the unevenness of the slope is large, since the elastic body or the bag-shaped body absorbs the unevenness of the ground, the concrete block is firmly fixed to the ground. be able to. Therefore, even when the lower surface of the concrete block is in uniform contact, and the tensile force is introduced by the anchor, the block does not become a beam state, and the strength is stable. Further, the tensile force of the anchor fixed to the substantially central portion of the concrete block is uniformly and entirely dispersed, and the ground reinforcement effect is enhanced.

Further, since the gap between the concrete block and the ground is filled by the interposed elastic body or bag-like body, there is no inflow of rainwater or the like, and the bottom of the concrete block is pressed to press the ground part. The scouring of the ground can be prevented.

As the elastic body, various resin foams or synthetic rubber-based elastic materials can be used, but the resistance of the resin foam or synthetic rubber-based elastic body to the anchor load, deformation of the concrete block, and the target area Considering that the mountain is rocky and there are sharp small irregularities,
Compressive strength (JIS K 7220) 0.5% at 5% compression strain
It is desirable to use a relatively hard resin foam of 4.0 kgf / cm ² or a synthetic rubber-based elastic material. In particular, when a resin foam is used as the elastic body, it is preferable to use a highly durable water-impermeable resin foam for the reasons described below.

On the other hand, the bag is made permeable,
By using a hydraulic powder material as the filling material, the bag-shaped body can be solidified while being spread and deformed.

The interposed portion of the elastic body may be the entire lower surface of the concrete block or may be partial.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to the drawings. In FIG. 1, a concrete block 1 according to the present invention has a substantially cross shape in plan view, and a large number of the blocks 1, 1,... Are cross-shaped along a length direction (L direction) of a slope. Are arranged adjacent to each other so that one side thereof forms a line. In the embodiment, the other side is also arranged adjacently in a row in the height direction connecting the shoulder 2 and the tail 3. When the ground strength of the slope is small, the staggered arrangement may be used to reduce the load and increase the number of anchors. Furthermore, there is a case where they are arranged in a row in the inclination direction.

The concrete block 1 has, for example, a side of a cross having a length of about 2 to 3 m and a thickness of 40 mm at the center.
It is 0-600 mm and 250-350 mm at the end, and a downward slope is formed toward the end. Further, a recess 10 which is recessed from the surface is formed near the intersection of the cross, and an anchor insertion hole 11 which penetrates from the center of the bottom surface 10A of the recess to the lower surface is formed. The anchor insertion hole 11 in the embodiment is formed so as to be slightly upward in the direction of the shoulder 2 instead of the direction orthogonal to the slope. Also, the bottom surface 1 of the recess 10
0A is formed in a direction orthogonal to the anchor insertion hole 11.

At the time of construction, the concrete block 1
A wire is hung on the suspension bolts 12 implanted on the surface of each of the feet, and is lifted up by a crane or the like and arranged at a predetermined position. Then, or simultaneously, the anchor insertion hole 1
A tensile member 20 such as a steel rod is inserted into 1, an anchor body 21 is formed at the tip of the tensile member 20 by injecting cement milk or the like, and an anchor head 20A such as a nut of the tensile member 20 is housed in the recess 10. The support plate 22 is attached to the concave bottom surface 1
With 0A as a seat, fixing is performed in a state where a tensile force is applied to the anchor body 21. These anchors are performed for each block 1, 1,.... After anchor anchoring, it is desirable to fill the concave portion 10 with a mortar 23 or the like and make its surface flush with the surface of the block 1 from the viewpoint of aesthetics and rust prevention.

In the embodiment, the anchor insertion hole 11
Are formed so as to expand toward the back surface side. Therefore, even when one concrete block 1 has different slopes on the same construction slope, it can be shared with slopes at different construction sites.

When fixing the concrete block 1 to the slope, an easily deformable elastic body 4 is interposed between the concrete block 1 and the slope N as shown in FIG. 4 as a reference example. It is difficult to completely smooth the surface of the slope N, and by interposing the elastic body 4 as described above, the elastic body 4 absorbs irregularities of the slope, and the concrete block 1 is placed on the slope. Fixing can be made in close contact with N. Further, since the tensile force introduced by the tensile member 20 is transmitted to the ground side via the elastic body 4 in the middle, the ground reinforcing effect is also high. Furthermore, since there is no gap on the lower surface of the concrete block 1 and the ground portion is completely and uniformly pressed by the elastic body 4, scouring of the ground can be prevented.

However, when the slope has relatively large unevenness, the single elastic body 4 as described above hardly absorbs the unevenness. Therefore, in such a case, as shown in FIG. 5 as an example of the present invention, a large number of sheet-like elastic bodies 5 having a relatively small area are prepared, and the number of the laminated elastic bodies 5 is adjusted. And 1-2 in the flat part
After the elastic bodies 5, 5,... Are laid out and adjusted so that the upper surface is substantially flat, the concrete block 1 is placed to absorb irregularities on the slope. be able to.

As the material of the elastic bodies 4 and 5, a resin foam or a synthetic rubber elastic body is preferably used. As the resin foam, specifically, resin foams such as polystyrene, polyurethane, vinyl chloride resin, polyethylene, polypropylene, phenol resin, and epoxy resin can be used. In this case, a black colorant can be added to match the color of the soil. In addition, as the synthetic rubber-based elastic body, acrylic rubber, butadiene rubber, polybutadiene rubber, chloroprene rubber, isoprene rubber, polyisobutylene rubber, butyl rubber, ethylene rubber, polyurethane rubber, chloride rubber, and the like can be used. The thickness t of the elastic bodies 4 and 5 varies depending on the easiness of deformation of the elastic bodies 4 and 5 and the anchor load. For example, a thickness of 30 to 300 mm, preferably 80 to 150 mm can be suitably used.

In the present invention, among the above-mentioned resin foams or synthetic rubber-based elastic bodies, a relatively hard one having a compressive strength of 5% and a compressive strain of 5% to 0.5 to 4.0 kgf / cm ² is preferred. It is preferably used. In general, soft resin foam or synthetic rubber-based elastic material absorbs unevenness more easily.However, in the case of the slope stabilization method in which a concrete block is fixed with an anchor, a rock-shaped hard method with a ground resistance is mainly used. Surfaces are often targeted, and the problematic irregularities are often sharp, fine irregularities that cannot be shaped flat. In the case of such unevenness, even a relatively hard resin foam or synthetic rubber-based elastic body can sufficiently adhere to the ground due to its compressive deformation and penetration into the concave portion due to this deformation, and also has an anchor load. Considering the strength of the resin foam or the synthetic rubber-based elastic body against the above, and the fact that the concrete block is greatly deformed if it is too soft, it is desirable to use a relatively hard material as described above. In particular, when a resin foam is used as the elastic bodies 4 and 5, a method of increasing the degree of foaming and making the void portion continuous to promote drainage can be considered.
It is conceivable that the contact will always come into contact with air or water alternately to accelerate the deterioration.Also, from the viewpoint of breakage of resin material due to freezing and expansion of the water remaining inside, deterioration of the resin material and fluctuation of anchor tension, long term In the case of the present construction method that requires a proof stress, it is preferable that the resin is made water-impermeable from the viewpoint of durability even when a resin foam is used.

On the other hand, as shown in FIG. 6, the second invention is a bag-like product in which powder such as slag powder, granules such as sand and gravel, and crushed stone materials such as crushed slag and crusher are packed in a bag. A large number of bodies 6 are prepared, and as shown in FIG. 7, the concrete blocks 1 are placed after placing the concrete blocks 1 on the concave surface or the concave / convex portions of the slope N, flattening the concrete block 1 installation surface. In this case, by using a net-like bag, a cloth bag, or a water-permeable bag having fine through holes as the bag, and using a hydraulic powder material such as slag, cement, or quicklime as the filling material 7, Water is given in a state where the bag-shaped body 6 is laid on the uneven portion of the ground to smooth the concrete block installation surface (upper surface), or in a state where the concrete block is installed and anchored and fixed, and the bag-shaped body 6 is kept in its deformed state. Can be solidified.

[0023]

As described above, according to the present invention, simplification of construction can be achieved, and when anchoring with an anchor, the concrete block and the ground can be fixed in close contact with each other. Further, advantages such as an excellent scouring prevention effect are provided.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an arrangement state of a concrete block on a slope.

FIG. 2 is a plan view of a concrete block.

FIG. 3 is a bottom view of a concrete block.

FIG. 4 is a sectional view showing a fixed state of a concrete block as a reference example.

FIG. 5 is a sectional view showing a fixed state of the concrete block of the present invention.

FIG. 6 is a partially broken side view of the bag-shaped body.

FIG. 7 is a sectional view showing a fixed state of a concrete block using a bag-like body.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Concrete block, 4,5 ... Elastic body, 6 ... Bag-shaped body, 7 ... Packing material, 10 ... Recess, 10A ... Recess bottom, 11 ... Anchor insertion hole, 12 ... Hanging bolt, 20 ...
Tensile material, 20A: anchor head, 21: anchor body,
22 ... Support plate.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E02D 17/20

Claims (5)

(57) [Claims] 1. A method for stabilizing a slope in which a large number of concrete blocks having a substantially cross shape in a plan view are regularly arranged on a slope, and the concrete block is anchored. A method for stabilizing a slope, characterized in that an easily deformable sheet-like elastic body is interposed between a surface and a concrete block by adjusting the number of layers in accordance with the uneven shape of the slope. 2. The method for stabilizing a slope according to claim 1, wherein the elastic body is a resin foam or a synthetic rubber-based elastic body. 3. The method for stabilizing a slope according to claim 1, wherein an impermeable material is used as the elastic body. 4. The elastic body according to claim 1, wherein said elastic body has a compressive strength of 5% and a compressive strain of 0.5 to 4.0 kgf / cm ^2.
The method for stabilizing a slope according to any one of the above items. 5. A method for stabilizing a slope in which a large number of concrete blocks having a substantially cross shape in plan view are regularly arranged adjacent to each other on a slope, and the concrete blocks are anchored. Before arranging the block, in the concave portion or uneven portion of the slope, a bag-like body packed with hydraulic powder material in a water-permeable bag body is arranged, and after the installation surface of the concrete block is flattened, A slope stabilization method characterized by placing blocks and solidifying them with water.