JPH0449217Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a shock absorber for use in rockfall shelters installed on roads, railway tracks, etc. in mountainous areas.

[Prior art]

Conventionally, in order to protect roads and railway tracks in mountainous areas from falling rocks, as shown in Figure 6,
Concrete foundations 7 are installed on both sides of a roadbed 6 such as the bed of a road or railway track, and supporting members 8 such as pillars or walls are constructed on each foundation 7, and a groove-shaped structure is formed over the top of each supporting member 8. A rockfall shelter 9 is constructed by erecting and fixing a cross-sectional roof structure 1, and a thick sand layer 5 with a thickness of 1 to 2 m is laid on top of the roof structure 1 as a buffer material against falling rocks 10. 5 absorbs the kinetic energy of the falling rock 10.

[Problem that the invention attempts to solve]

However, if the kinetic energy of the falling rock 10 is to be absorbed only by the sand layer, the thickness of the sand layer 5 must be made considerably thicker, which means that the amount of sand used will be considerably larger, and when the sand becomes wet, its weight will increase. Since it becomes heavy and a considerably large sand layer load acts on the falling rock shelter 9, it is necessary to increase the cross section of the roof structure 1, the supporting member 8, the foundation 7, etc., so there is a problem that the construction cost of the falling rock shelter 9 increases. be.

[Purpose of the invention, structure]

The purpose of this invention is to provide a shock absorber for falling rock shelters that can advantageously solve the above-mentioned problems, and the gist of this invention is to:
A large number of vertical rubber hollow shock absorbing cylinders 2 are placed side by side in the front-rear and left-right directions on the roof structure 1 of the rockfall silter, and a downward protrusion 3 is provided on the periphery.
A large number of metal protective covers 4 are placed side by side in the front-rear direction and left-right direction on the upper part of the hollow buffer cylinder layer, and each protective cover 4 has a large number of metal protective covers 4 arranged in the front-rear direction and left-right direction. This shock absorber for a falling rock shelter is characterized in that the upper end portion of a hollow shock absorbing cylinder 2 is fitted and a sand layer 5 is provided over the upper surface of each protective cover 4.

〔Example〕

Next, this invention will be explained in detail using illustrated examples.

Figures 1 to 5 show an embodiment of this invention, in which concrete foundations 7 are installed on both sides of a roadbed 6 such as the bed of a road or railway track, and pillars or walls are placed on each foundation 7. Support members 8 such as the above are constructed, and a roof structure 1 made of reinforced concrete with a box-shaped cross section is constructed over the top of each support member 8 to constitute a rockfall shelter 9.

On the roof structure 1 of the rockfall shelter 9, a large number of hollow buffer cylinders 2 made of vertical rubber cylinders are placed side by side in the front-rear and left-right directions to form a hollow buffer cylinder layer. , a rectangular box-shaped metal protective cover 4 equipped with a downward protrusion 3 extending along the entire circumference is coated with an anti-corrosion coating 11 such as a synthetic resin coating, and a large number of protective covers 4 are made of hollow buffer cylinders. A large number (25 in the illustrated case) of hollow shock-absorbing cylinders 2 are placed side by side in the front-rear direction and left-right direction on the upper part of the body layer, and inside each protective cover 4 there are a plurality of (25 in the illustrated case) hollow buffer cylinders 2 arranged in the front-rear direction and in the left-right direction. The rubber tape 1 for preventing sand leakage is inserted into the upper end and further extends over the upper surface of the joint between the adjacent protective covers 4.
2 is attached with adhesive, and a sand layer 5 is provided over the top surface of each protective cover 4, and this sand layer 5 is formed by leveling the sand placed on the protective cover with a bulldozer or other leveling machine. be done.

[Effect of idea]

According to this invention, a large number of vertical rubber hollow buffer cylinders 2 are placed side by side in the front-rear and left-right directions on the roof structure 1 of a rockfall silter, and are provided with downward protrusions 3 on the periphery. A large number of metal protective covers 4 are placed side by side in the front-rear direction and left-right direction on the upper part of the hollow buffer cylinder layer, and inside each protective cover 4, a large number of hollow buffer covers 4 are arranged in plural positions in the front-rear direction and in the left-right direction. Since the upper end of the cylindrical body 2 is fitted, when a falling rock load acts on the upper part of the hollow buffer cylindrical body 2, the falling rock load is dispersed by the metal protective cover 4 and the surrounding hollow buffer cylindrical body 2 is The shock load can also be transmitted to the cylinder body 2, so that it is possible to prevent damage to the hollow buffer cylinder body 2 due to excessive impact load acting on some hollow cushion cylinder bodies 2, and the protective cover 4 Since the upper portions of the many hollow buffer cylinders 2 are surrounded by the downward protrusion 3 around the periphery, it is possible to prevent the adjacent hollow buffer cylinders 2 from shifting relative to each other in the lateral direction.
Furthermore, when the sand layer 5 is leveled and formed using a heavy leveling machine such as a bulldozer, the weight of the leveling machine is reduced by the metal protective cover 4 and the large number of hollow buffer cylinders 2.
Therefore, effects such as being able to prevent some of the hollow buffer cylinders 2 from being damaged due to excessive load can be obtained.

[Brief explanation of the drawing]

Figures 1 to 5 show an embodiment of this invention, in which Figure 1 is a longitudinal cross-sectional side view of a falling rock shelter equipped with a shock absorber of this invention, and Figure 2 is a partially enlarged view. FIG. 3 is a plan view showing a state in which protective covers are covered over a large number of hollow buffer cylinders, FIG. 4 is a sectional view taken along line A-A in FIG. 3, and FIG. FIG. FIG. 6 is a longitudinal sectional side view of a conventional rock fall shelter with a buffer sand layer. In the figure, 1 is a roof structure, 2 is a rubber hollow buffer cylinder, 3 is a downward protrusion, 4 is a metal protective cover, 5 is a sand layer, 6 is a roadbed, 7 is a foundation, 8 is a support member, and 9 is a support member. A falling rock silter, 11 is an anti-corrosion coating, and 12 is a rubber tape for preventing sand leakage.

Claims (1)

[Scope of utility model registration request] A large number of vertical rubber hollow shock absorbing cylinders 2 are placed side by side in the front-rear and left-right directions on the roof structure 1 of the rockfall silter, and a large number of metal protection bodies are provided with downward protrusions 3 on the periphery. The covers 4 are placed side by side in the front-rear direction and left-right direction on the upper part of the hollow buffer cylinder layer, and inside each protective cover 4, the upper end portions of a large number of hollow buffer cylinders 2 are arranged in plural numbers in the front-rear direction and in the left-right direction. A shock absorbing device for a falling rock shelter, characterized in that a sand layer 5 is provided over the upper surface of each protective cover 4.