JPH0480164B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a flooded top of an erosion control dam.

There are many accidents in which the top of the erosion control dam is damaged due to abrasion caused by falling debris flows and falling debris, or by being directly hit by debris.

Therefore, a concrete material with high compressive strength and hard properties has been developed for the top of the water passage, and is currently mainly used. However, this does not solve the problem of wear caused by debris flows and falling debris, and does not allow direct impact from debris. Even if it is damaged, it will not prevent the top from being damaged to varying degrees, and its durability will be extremely low.

Therefore, recently, an erosion control dam was devised in which a steel plate is installed on the top of the dam to prevent the concrete from being damaged even if it is directly hit by debris. However, in actual construction, the steel plate lacks the ability to disperse the force when it is directly hit by stones, so the strong load concentrates on the concrete directly below the direct hit, resulting in damage to the concrete. This results in Furthermore, the concrete upstream of the steel plate attached to it is subject to abrasion and scouring by falling debris, resulting in a gap between the steel plate and the concrete, and the steel plate is torn downstream from that point. I found that it would roll up, and eventually be washed away.

The present invention aims to solve the above-mentioned drawbacks, and includes forming a stepped portion over the entire length from the upstream shoulder to the downstream shoulder of the top end, and embedding sockets at predetermined intervals in this stepped portion. A protective material made of a rubber plate with a built-in iron plate is fitted continuously and closely between the stepped parts, and this protective material is fixed to the top using the embedded socket and anchor bolt to form a complete unit, thereby preventing debris flows and falling stones. It is characterized by being able to prevent damage to the concrete by attenuating the impact force even if it is directly hit by stone debris.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 3 is a cross-sectional view with a protective material attached to the top end.

1 is an erosion control dam, which is made of ordinary concrete and is formed into a mountain shape.

2 and 3 are steps formed over the entire length on the upstream shoulder and downstream shoulder of the top of this erosion control dam 1,
In the illustration, the stepped portion 2 on the upstream shoulder is formed at a somewhat lower position than the stepped portion 3 on the downstream shoulder, but this does not necessarily have to be the case. An embedded socket 4 is embedded between the stepped portions 2 and 3 at a predetermined interval.

Next, a protective material 5 is attached between the stepped portions 2 and 3, and this protective material 5 is made to match the height of the stepped portions 2 and 3, which are formed to have a constant width by embedding a steel plate 7 in a rubber plate 6. The iron plate 7 is made of a synthetic material with a thickness of about 100 mm, and the iron plate 7 is buried at a position where the thickness of the rubber on the front side is thicker than the thickness of the rubber on the back side.
It is shaped to cover three spaces. The protective material 5 thus constructed is fitted between the stepped portions 2 and 3 by screwing a bolt 9 into the embedded socket 3 through a locking hole 8 that is drilled to match the position of the embedded socket 4. and fix it tightly.

During this installation, as shown in the figure, the joints of the downstream shoulder protection material, the top protection material, and the upstream shoulder protection material are joined in the direction of the water flow so that they do not go against the flow of debris. There is.

According to the present invention described above, steps are formed over the entire length on the upstream and downstream shoulders of the top of the erosion control dam, and a protection material of a certain width is provided between the steps using a rubber plate with a built-in iron plate. At the same time, by covering the entire top of the dam in close contact with each other, it prevents the top from being worn out by debris flows and falling debris, improving the durability of the erosion control dam.In addition, it is possible to prevent the erosion control dam from being worn down by debris flows and falling debris, and to protect the dam from damage if it is directly hit by debris. Due to the cushioning effect of the rubber and the force dispersion effect of the steel plate, the impact force on the concrete can be greatly attenuated and damage to the concrete can be prevented.

Furthermore, by covering the area below the upstream shoulder with the protective material, the concrete at the top is not worn away by debris flows and falling debris, and the protective material is also prevented from rolling up and tearing. This not only improves the durability of the protective material, but also improves the durability of the top.

In addition, by installing a protective material pre-formed in the shape of the top end between the steps of the top end after the concrete has cured, it is possible to prevent gaps between the protective material and the concrete surface due to shrinkage of the concrete during the curing period. Also, the elasticity of the rubber allows for complete adhesion, so when stones fall onto the protective material and receive an impact, the impact force is sufficiently dispersed to ensure protection of the concrete. Become.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing one embodiment of the present invention, and FIG.
The figure is a sectional view, and FIG. 3 is an enlarged view of the main part. 2, 3...Stepped portion, 4...Embedded socket, 5...
...protective material, 9...bolts.

Claims (1)

[Claims] 1. A step is formed over the entire length from the upstream shoulder to the downstream shoulder of the top, embedded sockets are embedded in this step at predetermined intervals, and a protective material made of a rubber plate with a built-in iron plate is installed between the steps. A water-permeable top of an erosion control dam, characterized in that the protective material is fitted in a continuous and close manner and is fixed to the top using the embedded socket and anchor bolt to form a whole.