JPS64423Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to the improvement of the top of an erosion control dam.

In conventional erosion control dams, the top of the water passage is
In order to prevent the surface from being abraded or destroyed due to friction and collisions caused by the flow of debris, they were constructed with stone paving, hard concrete (granosilic, iron concrete, etc.), or iron plates. However, solid concrete is prone to breakage and cracking due to concentration of impact force, and steel plates are prone to corrosion, wear, and damage to the attachment anchors. There are problems such as the concrete being easily eroded due to impact at the edges.
If left unattended, there is a risk of the dam itself being destroyed, so maintenance and replacement work is required, which requires a lot of labor and money. Therefore, there is currently a need to improve the durability of the top of the erosion control dam.

The purpose of this invention is to provide a water-through top of an erosion control dam with improved durability.

The configuration of the water passage top of the erosion control dam of this invention is such that at least each of the top of the water flow part, the upper part of the downstream side continuous to the top, and the upper part of the upstream side continuous to the top are respectively A protective layer is provided on the continuous portion of the rubber layer and on the outer surface of the rubber layer in the vicinity of the continuous portion of the rubber layer.

According to this configuration, when earth and rocks collide, the impact force is alleviated by the outer rubber layer of the steel plate and transmitted to the steel plate, and the wide surface of the steel plate is pressed against the dam body via the inner rubber layer. become. Therefore,
The cushioning effect of the elasticity of the rubber and the force dispersion effect of the steel plates eliminate concentrated impact on the dam body, making it difficult for cracks to occur in the concrete of the dam body. Furthermore, unlike when a steel plate is directly covered with concrete, the phenomenon of erosion of the concrete at the edges does not occur. In addition, comparative experiments using models confirmed the superiority of this invention in terms of wear resistance. To explain the experiment, there is a structure A made of only concrete 1 with a cross-sectional shape as shown in Figure 1 a to c, a structure B made of concrete 1 covered with a steel plate 2 with a thickness of 6 mm, and a structure B made of concrete 1 with a thickness of 30 mm. A structure C is prepared in which a steel plate 4 with a thickness of 6 mm is buried in a rubber layer 3 of the present invention, and a structure C is coated with a material equivalent to the protective layer in the configuration of this invention. When sprayed under the conditions, as shown in Figure 2 a to c, structure A had a spraying rate of 15
A crack 6 occurred in seconds, a through hole 7 occurred in the iron plate 2 in 2 minutes in structure B, and a dent 8 with a depth of 3 mm in the outer rubber layer occurred in structure C after 2 minutes.
Therefore, it can be seen that the protective layer of this invention, in which an iron plate is embedded in the rubber layer, has extremely excellent abrasion resistance against sand particles.

Examples of this invention will be described below with reference to the drawings.
FIG. 3 shows the embodiment of FIG. 1, and shows a longitudinal cross section of the water-flowing part of the sabo dam, where 10 is the dam body, 11 is the crown, 12 is the upstream method, 13 is the downstream method, 14,
15 is a protective layer and 16 is concrete.

The protective layer 14 includes an iron plate in a rubber layer 17 having a substantially uniform thickness so as to form an outer surface of a curved surface portion that is a continuous portion of the top end 11 and the upstream edge 12 and flat portions near both sides of the curved surface portion. No. 18 is embedded in the rubber so as to be adhered thereto. The protective layer 15 is made of a rubber layer, similar to the protective layer 14, so as to form an outer surface of a bent surface section that is a continuous portion of the downstream end 13 and the crown end 11, and a flat section in the vicinity thereof. An iron plate 20 is buried in the 19.

The concrete 16 is obtained by placing the protective layers 14 and 15 in the form of a formwork on the dam body 10 and pouring it into the inside thereof.

FIG. 4 shows a second embodiment, showing a cross section similar to that in FIG. 3, and parts equivalent to those in FIG. 3 are designated by the same reference numerals. The difference from the first embodiment is that the protective layer 21 covers the upper part of the upstream side 12, the entire width of the top 11, and the downstream side 1.
It is a point that is integrated with the upper part of No. 3 so as to form the entire outer surface. In the figure, 22 is a rubber layer, and 23 is an iron plate. The concrete 16 is poured into the protective layer 21 through a concrete injection hole that is suitably drilled in a portion 24 sufficiently inside both sides of the top end 11.

It should be noted that the protective layers 14, 15, 21 are provided with uneven portions on their inner surfaces for biting into concrete as necessary, and anchor bolts are used for edge portions that are likely to peel off. FIG. 5 shows an example of an anchor bolt, in which a nut holder 30 is provided on an iron plate 19 to accommodate a nut 31 and pulled by an anchor bolt 32.

In both Examples 1 and 2, a protective layer with iron plates embedded in the rubber layer is provided in areas that are likely to receive shock or friction when a flow of debris passes through the top of the drainage section of the erosion control dam. Due to the above-mentioned impact mitigation effect and wear resistance, the effect of preventing erosion control dam damage can be maintained for a long period of time. Therefore, the effort required for maintenance of the sabo dam can be significantly reduced.

[Brief explanation of the drawing]

Figure 1 shows the structure model for which comparative experiments were conducted on wear resistance. a is a longitudinal cross-sectional view of A, which is made only of conventional concrete, b is a longitudinal cross-sectional view of B, which is made of conventional concrete with a steel plate attached, and c is a vertical cross-sectional view of concrete C with a protective layer applied to it according to this invention, and Figure 2 shows the shape of the above structure models A, B, and C after a sand particle spraying experiment, where a is model A and b is the model. B and c are longitudinal cross-sectional views of model C, FIG. 3 is a vertical cross-sectional side view of the drainage part of the sabo dam according to the first embodiment of this invention, and FIG. 3
FIG. 5 is a longitudinal cross-sectional view similar to the figure, and a partially enlarged cross-sectional view showing an example of the anchor bolt mounting structure for the first embodiment. 3, 17, 19, 22...Rubber layer, 4, 18,
20, 23... Steel plate, 11... Top, 12... Upstream method, 13... Downstream method, 1, 16... Concrete, 5, 14, 15, 21... Protective layer.

Claims (1)

[Scope of utility model registration request] In the rubber layer, at least the outer surface of the continuous part of the top of the water passage part, the upper part of the downstream part continuous to the top, and the upper part of the upstream part continuous to the top, and the vicinity thereof. A water-through top of an erosion control dam, characterized in that a protective layer is provided by submerging a steel plate substantially along the outer surface so as to adhere to the rubber.