JPH0473492B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a structure placed on a mountain for avalanche prevention and slope stability.

[Prior art]

Various construction methods have been used to stabilize slopes. For example, in the block construction method, precast concrete blocks are lifted up and lined up on a slope to prevent the ground from collapsing.

The method of constructing a legal framework involves placing formwork vertically and horizontally on the ground, and pouring cement-based hardening material into the formwork to construct a legal framework and prevent the ground from collapsing.

[Problems to be solved by this invention]

The problem with the block construction method described above is that it requires a lot of effort to lift a large number of heavy blocks up a slope.

The problem with the method of construction is that it is difficult to assemble the formwork on the entire slope on-site, and hardening material cannot be poured until the entire slope is assembled, resulting in a long construction period. Furthermore, the slope is continuous over the entire slope, making structural calculations complicated.

Furthermore, none of the structures for stabilizing slopes described above discloses a structure for preventing avalanches.

This invention was made in order to solve the above-mentioned problems, and the purpose is to provide a slope stabilizing structure that is easy to install, can shorten the construction period, and has good adhesion to the ground. shall be.

Another object of this invention is to provide an avalanche prevention and slope stabilization structure that can be manufactured at low manufacturing cost and that can strongly prevent avalanches.

[Means to solve the problem]

The avalanche prevention and slope stabilization structure according to the present invention is formed into a cross shape with a central portion and overhanging portions extending in all directions from the central portion. Anchor insertion holes are vertically penetrated through the center. The protruding portion of the anchor fixed to the ground is inserted into the anchor insertion hole, and the anchor is fixed by a fixing tool. Extend the excess part of the anchor upwards and pour concrete into the formwork built around it.
Form an avalanche prevention section by burying the excess portion of the anchor.

The avalanche prevention section may also be made of precast concrete. This avalanche prevention part has an anchor insertion hole that passes through it vertically.
Place it on the center via the elastic seat. Insert the part of the anchor protruding from the ground into both the anchor insertion holes in the center part and this avalanche prevention part. Fix the anchor on the avalanche prevention section.

The elastic seat body can be made of hard rubber.

The height of each overhang may gradually decrease from the center to the tip.

[Effect]

The overhanging parts protrude in all directions, and by placing it on the ground and fixing it to an anchor, it is possible to hold down a large area of the ground with one structure.

An avalanche prevention section that protrudes upward prevents snow from falling any further.

The avalanche prevention section is reinforced by the surplus anchor part buried inside.

The avalanche prevention part placed on the elastic seat body by anchors can flexibly respond to lateral loads and avoid damage.

〔Example〕

Hereinafter, the present invention will be explained in detail based on an embodiment shown in the drawings.

What is shown in FIGS. 1 and 2 is an avalanche prevention and slope guidance structure A according to the present invention. Reference numeral 1 denotes a central portion, and an anchor insertion hole 2 is formed in the central portion 1 to penetrate vertically. It is formed into a cross shape by overhanging parts 3 extending in all directions from the central part 1. The overhanging portion 3 is formed so that its height gradually decreases from the center portion 1 toward each tip.

This combination of the central part 1 and the overhanging part 3 is placed on the ground. An anchor 4 is driven into the earth, and the protruding portion of the anchor 4 from the earth is inserted into the center part 1 of the overhanging part 3. A ground anchor, lock anchor, or lock bolt can be used as the anchor 4, but in this example,
A ground anchor made of PC steel wire and fixed in the drilled hole 5 with grout material 6 is employed.

This anchor 4 is fixed on the central portion 1 with a fixing device 7 such as a nut or wedge. The surplus portion 4a of the fixed anchor 4, that is, the portion of the PC steel wire that protrudes above the fixing tool 7 is made to extend upward. A formwork is constructed to surround the surplus portion 4a of the anchor 4, and concrete 8 is cast to form an avalanche prevention portion 9 in which the surplus portion 4a is buried. In the embodiment, the avalanche prevention part 9 is formed in the shape of a square prism, but other shapes such as a polygonal prism or a cylinder can also be adopted.

As described above, a plurality of structures A are installed at appropriate intervals. As shown in FIG. 7, the projecting portions 3 may be arranged in a continuous grid pattern. The overhanging portions 3 protrude in all directions, and can hold the earth relatively wide, and can stabilize the earth even if placed at some intervals.

Furthermore, each structure A has an avalanche prevention section 9 projecting upward, and this avalanche prevention section 9 prevents snow from falling. When a large stress is applied to the avalanche prevention section 9 from the lateral direction, the surplus portion 4a of the anchor 4 receives the tensile force, so that the avalanche prevention section 9 can be prevented from being damaged. Therefore, complicated reinforcement arrangement for the avalanche prevention section 9 can be omitted, and manufacturing costs can be reduced.

FIG. 4 shows a case in which a central part 1 and an overhanging part 3 made of precast concrete are integrated.

Filling holes 10 are formed in each of the overhanging portions 2, penetrating up and down, and concrete is poured into the filling holes 10 after being delivered to the site. Since the filling hole 10 is formed, the weight of the structure A is reduced, making it easier to transport it to the site. Also filling hole 1
The concrete placed in the area 0 adheres closely to the ground, and the structure A and the ground are well integrated.

FIG. 5 shows a case where an avalanche prevention section 9 made of precast concrete is used. That is, the avalanche prevention part 9 is formed with an anchor insertion hole 11 passing through it vertically, and the avalanche prevention part 9 is placed on the center part 1 via the elastic seat 12. The elastic seat body 12 is an elastically bendable member, and is made of a hard rubber material, a synthetic resin material, or the like.

The protruding portion of the anchor 4 from the ground is inserted into the anchor insertion hole 2 of the central portion 1 and the anchor insertion hole 11 of the avalanche prevention part 9, and fixed on the avalanche prevention part 9 by the fixing device 7.

With the structure A having such a configuration, when a lateral force acts on the avalanche prevention part 9, the elastic seat body 12
is compressed and the avalanche prevention part 9 is tilted. In other words, the elastic seat body 12 acts as a cushioning material and prevents the structure from being damaged.

〔Effect of the invention〕

The present invention has the above configuration and can obtain the following effects.

○B The structure has overhanging parts that extend in all directions, and one structure can stabilize a relatively wide area. Therefore, instead of using a large number of members as in the block construction method or assembling formwork continuously over the entire slope as in the sill construction process, which is troublesome, multiple structures can be placed at appropriate intervals. By doing so, you can easily stabilize the entire slope. Furthermore, since the structure is a single unit, structural calculations are easy.

○B The structure has an avalanche prevention part that protrudes upward, and this avalanche prevention part can dam snow and prevent further snow from falling.

○C If an avalanche prevention section is formed by burying the surplus part of the anchor that has been fixed on the center part, there will be no need for complicated reinforcement and the structure will be difficult to damage.

○D If the avalanche prevention part with the anchor insertion hole is placed on the center part via the elastic seat and the anchor is fixed on the avalanche prevention part, the avalanche prevention part will tilt due to lateral stress and will not be damaged. It can be prevented.

E. The elastic seat body is elastically bendable, absorbs the energy of lateral impact loads, provides a buffering effect, and becomes a structure that is resistant to impacts unlike conventional structures.

○F If the height of the center of a structure is increased, the strength of the center of the structure, where a large bending moment acts, will be increased, resulting in a strong slope-stabilizing structure.

[Brief explanation of drawings]

Fig. 1 is a perspective view of an embodiment of the avalanche prevention and slope stabilization structure according to the present invention, Fig. 2 is a side view thereof, Fig. 3 is a longitudinal sectional view of its anchoring part, and Fig. 4 is a structure of the structure. 5 is a perspective view of one embodiment of the structure, FIG. 6 is a side view thereof, FIG. 7 is a perspective view of the structure placed on the ground, and FIG. 8
The figure is a side view thereof. A...Structural part, 1...Central part, 2...Anchor insertion hole, 3...Overhanging part, 4...Anchor, 7...
...Fixing tool, 8...Concrete, 9...Avalanche prevention section, 11...Anchor insertion hole, 12...Elastic seat body.

Claims (1)

[Scope of Claims] 1. The anchor is formed in a cross shape by a center part having an anchor insertion hole penetrating vertically and projecting parts projecting in all directions from this center part, and is fixed to the ground. The protruding part is inserted into the anchor insertion hole and fixed by the anchor, and the surplus part of the anchor is extended upward and buried in the avalanche prevention part formed on the center part and protruding upward. Features avalanche prevention and slope stabilization structures. 2 Formed in the shape of a cross by a central part having an anchor insertion hole penetrating vertically and overhanging parts protruding in all directions from this central part, and having an anchor insertion hole penetrating vertically above the central part via an elastic seat body. A precast concrete avalanche prevention part having an anchor insertion hole to prevent an avalanche is placed, and the protruding part of the anchor fixed to the ground is inserted into the center part and the anchor insertion hole of the avalanche prevention part to prevent an avalanche. A structure for avalanche prevention and slope stabilization, characterized in that an anchor is fixed on the prevention part by a fixing device. 3. The avalanche prevention and slope stabilization structure according to claim 2, wherein the elastic seat is made of a hard rubber material or a synthetic resin material. 4. The structure for avalanche prevention and slope stabilization according to claim 1 or 2, characterized in that the height of the overhanging portions extending in all directions gradually decreases from the center toward the tip.