JP2003003426A - Cushioning material for wall for falling stone - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain standardization in addition to the ensuring of the level of the cushioning effect of a conventional cushioning material for a wall for a falling stone, to obtain convenience in conveyance and installation works by light weight and to acquire a sanitary state and facilitate maintenance. SOLUTION: A light-weight integral type cushioning material for the wall for the falling stone, by which impact load is dispersed and absorbed by a cushioning layer combined by a foamed resin such as foamed styrene, a hollow resin vessel and a shock dispersing plate and an outer frame body molded of glass fiber-filled reinforced plastics or a synthetic resin having equal physical and chemical characteristics, is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rockfall prevention wall for preventing falling rocks, rocks, etc. at a lower portion of a rockfall generation source such as a mountain area, and further, a buffer effect for a rockfall prevention fence and a collapsed sediment protection fence. It is related to the cushioning material.

[0002]

2. Description of the Related Art A conventional rockfall prevention wall is a basic concrete in which a main post made of H-shaped steel is extended at a distance of several meters perpendicularly to a slope at a foundation concrete to be placed at a rockfall prevention location, and the main post is extended. Another or the same foundation concrete is placed on the valley side of, and the part of the extended main post that is opposite to the solid concrete end is connected and the foundation concrete placed on the valley side is connected and fixed with a support made of H-shaped steel. , The base of the support and the main post are connected and fixed with the bottom joint. Furthermore, on the main post fixed to the foundation concrete, old tires were supported on the wall material and used as a cushioning material to form a rockfall prevention wall.

The cushioning material made of old tires is used to prevent the wall body from being damaged by the impact of rock fall. The old tires are used as cushioning material at places where rock fall prevention walls should be installed. Although it is generally located in a mountainous area where transportation is inconvenient, it is easy to carry because of its light weight, it is economical because used tires are cheap, and it is also intended to promote the use of waste materials. The old tires are closely bound to each other with a numbered wire, and are stacked so that the thickness is 70 cm, depending on the scale of rock fall.

In addition, a sand cushion method for supporting earth or sand or sandbags on a wall material may be used instead of the old tire. In this sand cushion method, rock fall was absorbed into the sand or sandbags to absorb the rock fall.

[0005]

The old tire used in the conventional rockfall prevention wall has a hollow structure with no tube inside, and the old tires are merely laminated in the same direction. Therefore, with a small number of layers, it is not possible to disperse stress in the lateral direction of the rockfall that has fallen from above,
When a larger load is applied, it deforms flat and the amount of impact energy absorbed decreases. For this reason, according to the regulations, old tires that are closely tied together by a number wire are laminated to have a thickness of 70 cm, that is, five layers, depending on the scale of rockfall.

[0006] However, because of the topography of the site and the structure of the rockfall prevention wall in the mountainous area where multiple layers are stacked, it is not economical because it takes a lot of time for installation work and it is not economical to tie them together with a tie wire. In addition, there is a problem that it is necessary to consider safety measures for workers due to falling rocks during installation work.

Further, there is a problem in that the appearance as a proper cushioning material cannot be maintained due to secular change, such as stacking failure easily occurring due to corrosion of the wire.

[0008] In addition, since old tires tend to accumulate rainwater due to their structure and generate harmful insects such as mosquitoes and smell, there is a problem in that hygiene must be taken into consideration when the tires are located adjacent to private houses or public facilities. Had.

In addition to old tires, a sand cushion construction method of stacking sand or sandbags on a wall material may be used. This sand cushion method has an advantage that a load distribution effect is excellent when a dynamic load is applied, such as rock fall, because rock fall or the like is embedded in the sand or sandbags. However, in the sand cushion method, a large load is applied and a large amount of stress is generated, and its physical shape cannot be maintained due to physical attack such as rain, so that the cushioning effect is not always constant. Further, since it is heavy, it has a problem that it is difficult to carry it to an installation place such as a mountain area.

[0010]

Therefore, according to the present invention, a buffer layer formed by combining a foamed resin such as foamed styrene, a hollow resin container, and an impact dispersion plate, a glass fiber-reinforced plastic, or an equivalent physical or chemical material. The above-mentioned problem is solved by providing a lightweight and integrated shock absorbing material for a rockfall prevention wall, which is characterized in that an impact load is dispersed and absorbed by an outer frame body formed of a synthetic resin having specific characteristics.

[0011]

When the impact force of rock fall is applied to the shock absorbing material for a rock fall prevention wall of the present invention, the outer frame body is deformed, the foam resin is shock-absorbed, the shock-dispersing plate has a shock-dispersing effect, and the hollow resin container is deformed. The shock absorbing material absorbs the impact force, so that the impact force of the rock fall on the rock fall prevention wall is relaxed and dispersed in a plane.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The cushioning material for a rockfall prevention wall of the present invention is a reinforced plastic containing glass fiber or a physical equivalent thereof.
The outer frame body is made of synthetic resin having chemical characteristics, and the inner layer of the outer frame body is composed of a foamed resin such as styrene foam, an impact dispersion plate, and a buffer layer consisting of a hollow sealed or hollow resin container with small holes. Composing and cushioning the impact of falling rocks.
The impact of the rockfall hits the outer frame made of resin such as reinforced plastic containing glass fiber, and the impact of the reinforced plastic containing glass fiber is dispersed throughout the cushioning material. Then, the impact is absorbed by the foamed resin, and the absorbed and cushioned impact is further dispersed by the impact dispersion plate in the middle. Next, the impact is further alleviated by the air compression deformation energy of the hollow resin container structure, and finally the impact is further dispersed by the impact dispersion plate and the bottom plate of the outer frame to disperse the impact on the structure of the rockfall prevention wall. ease.

That is, the impact force applied at a point due to the collision of rockfall is transmitted through the glass fiber-reinforced reinforced plastic outer frame on the surface on which the rockfall collides and the shock dispersion plate in the middle of the buffer layer, or at the lower part. Since it is transmitted to the rockfall prevention wall through the plate and the bottom plate of the outer frame, the rockfall prevention wall receives the load on the surface, which is more advantageous than the case where the load is received.

The hollow resin container constituting the buffer layer may be multi-layered as necessary to cope with a larger rockfall energy. At this time, since the hollow resin container itself is lightweight, the weight of the cushioning material of the present invention itself is only slightly increased.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A cushioning material for a rock fall prevention wall according to the present invention will be described with reference to the accompanying drawings. FIG. 1 shows an installation situation of the cushioning material for a rock fall prevention wall of the present invention, for example, a situation in which the cushioning material is placed on a rock fall prevention surface of a rock fall prevention wall for use.

FIG. 2 shows the disassembled state. As shown in FIG. 2, it comprises an outer frame body 1, a bottom plate 6 of the outer frame body, a foamed resin 2 therein, an impact dispersion plate 3, a hollow resin container 4 and an impact dispersion plate 5. The outer frame body 1 and the bottom material 6 of the outer frame body are made of glass fiber reinforced plastic or a synthetic resin having the same physical and chemical properties. The outer frame body 1 and the bottom plate 6 of the outer frame body are bonded to each other to cause rockfall. Form a cushioning material shape for the prevention wall.

FIG. 3 is a sectional view of the present invention. In the figure, the impact caused by the falling rock 8 is first received on the surface by the box-shaped outer frame body 1 composed of the outer frame body 1 and the bottom plate 6 of the outer frame body, and the impact energy is absorbed by the foamed resin 2. . The impact energy absorbed by the foamed resin 2 is further dispersed by the impact dispersion plate 3 in the middle, and is transmitted to the hollow resin container 4 below and compressed. At this time, the hollow resin container is elastically and plastically deformed to absorb the kinetic energy of the rockfall 8. Further, it is transmitted to the rockfall prevention wall as a load distributed in a plane through the impact dispersion plate 5 and the bottom plate 6 of the outer frame.

FIG. 4 shows the internal deformation due to the impact of rockfall. The figure shows how the rockfall impact energy is dispersed and absorbed. The impact of the falling rock 8 causes the outer frame 1 to be deformed like 1-a to disperse the impact force. Next, the foamed resin 2 is 2-a
It deforms like and absorbs impact energy. The energy is received on the surface of the impact dispersion plate 3-a, is transmitted to the hollow resin container 4-a, and the hollow resin container 4 is plastically deformed like 4-a and absorbs the energy. Then, the impact dispersion plate 5-a and the bottom plate 6-a of the outer frame body transmit the impact again to the rockfall prevention wall as a load distributed in a plane.

2 shows a rectangular parallelepiped resin container, the hollow resin container is a cylindrical container 7 as shown in FIG.
Alternatively, the shape of the sphere 9 may be used as shown in FIG. Further, other shapes may be used as long as they are hollow, and they may be laminated in multiple stages such as two stages and three stages. FIG. 5 shows a case where the hollow resin container is a cylinder. FIG. 6 shows a case where the hollow resin container is a sphere.

[0020]

The present invention is carried out in the form as described above, and has the following effects.

According to the present invention, the weight per unit area can be reduced while securing the cushioning performance required in the conventional rockfall prevention wall, so that it can be easily transported and installed. Therefore, the installation work can be shortened and the work cost can be suppressed.

Further, as described above, it is possible to reduce the risk rate due to rock fall during the installation work.

Since the product of the present invention is a molded product, it is possible to standardize the performance which has not been provided by the conventional cushioning material for a rock fall prevention wall.

Since the outer frame is made of synthetic resin such as reinforced plastic containing glass fiber, it can be colored easily, has good weather resistance, and can maintain a proper shape for a long time.

Further, since the outer frame body has a shape covering the buffer layer, the buffer layer is less affected by a natural attack, and the buffer effect can be maintained for a long time.

Further, the shape of the outer frame is hygienic because rainwater, which causes odors and odors such as mosquitoes, does not collect.

Further, when damage is caused by falling rocks, only one of the damaged parts can be replaced, which facilitates maintenance after installation.

[Brief description of drawings]

FIG. 1 is a perspective view schematically showing an embodiment of a cushioning material for a rockfall prevention wall of the present invention.

FIG. 2 is a perspective view showing an example of a typical structure of a cushioning material for a rockfall prevention wall according to the present invention.

FIG. 3 is a cross-sectional view of a representative example of a cushioning material for a rockfall prevention wall of the present invention.

FIG. 4 is a sectional view showing the concept of absorbing the impact of rockfall according to the present invention.

FIG. 5 is a perspective view schematically showing a case where a hollow resin container is a cylinder.

FIG. 6 is a perspective view schematically showing a case where the hollow resin container is a sphere.

[Explanation of symbols]

K Buffer material for rockfall prevention wall of the present invention R Rockfall prevention wall 1, 1-a outer frame 2,2-a foamed resin 3,3-a, 5,5-a Impact Dispersion Plate 4, 4-a, 7, 9 hollow resin container 6, 6-a, bottom plate of outer frame 8 falling rocks

Claims (4)

[Claims] 1. A buffer layer formed by combining a foamed resin 2 such as foamed styrene, a hollow resin container 4, 7, 9 and an impact dispersion plate 3, 5, a reinforced plastic containing glass fiber or an equivalent physical or chemical substance. A shock absorbing material for a rock fall prevention wall, characterized in that an impact load is dispersed and absorbed by an outer frame body (1) and a bottom plate (6) of the outer frame body molded from a synthetic resin having specific characteristics. 2. The cushioning material for a rockfall prevention wall according to claim 1, wherein the hollow resin container 4 is a cubic body having a closed or small hole. 3. The cushioning material for a rockfall prevention wall according to claim 1, wherein the hollow resin container 7 is a cylinder having a closed or small hole. 4. The shock-absorbing material for a rockfall prevention wall according to claim 1, wherein the hollow resin container 9 is a sphere that is closed or has small holes.