JPH01250511A - Dust-proof method for dam intake - Google Patents

Abstract

PURPOSE:To enable the large dirt of driftwood or the like and minute dirt to be removed, by arranging pontoons near a dam intake tower, and by suspending the networks of large meshes and small meshes, outside a surface opposite to the dam intake tower. CONSTITUTION:Near a dam intake, pontoons 2 are continuously arranged. Then, on sides opposite to the intakes of the pontoons 2, the networks 4 of large meshes are fitted with the weights of stud link chains 3 at lower end edges. Outside the networks 4, the networks 5 of small meshes made of plastics are lined and suspended with weights 6 fitted at lower ends. As a result, the large dirt of driftwood or the like can be removed by the networks 4, and minute dirt can be also removed by the networks 5.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a dust prevention method for a dam water intake, and relates to a method that can reduce the amount of dust treatment work at the dam water intake and improve the dust removal efficiency. be.

[Conventional technology]

A large amount of debris accumulates at the dam intake during the snow melting season, and it adheres to the intake tower screen, interfering with power generation and other water intake.

Conventionally, near the water intake of a dam, a floating pier 2 is provided in front of the water intake tower 1 as shown in FIG. Net 4 (mesh 50x5) with stud link chain 3 attached
0) to a depth of approximately 3. OOO+u+ is made to hang down to prevent dust from approaching the water intake tower 1.

[Problems to be solved by the present invention]

However, although the conventional net 4 has a relatively large mesh and can capture large pieces of driftwood, etc., it has the disadvantage that fine dust passes through the mesh of the net 4 and reaches up to one inch of the water intake tower.

Therefore, even if the above-mentioned method is used, workers must regularly ride in a small boat to remove the dust that has accumulated on the screen of the water intake tower 1, which is not only inefficient but also frequent and dangerous. It has the disadvantage of being.

The object of the present invention is to provide a dust-proofing method for a dam water intake that can improve the above-mentioned conventional drawbacks, can reliably capture even fine dust, and has good workability.

[Means to solve the problem]

The present invention combines an existing net that is suspended from the outside of the opposite side of the water intake tower of a floating pier installed near the dam water intake tower, and a fine-mesh net or a blind plate to be suspended and suspended from the dam water surface. This is a dust prevention method for a dam water intake that can prevent dust from accumulating at the water intake of a water intake tower by restricting the flow rate of nearby water.

[For production]

The present invention has the above configuration, and the flow rate of water taken from the water intake tower is faster at the dam surface and tends to gradually decrease as the depth increases.If the net is suspended from the floating pier, It is thought that the difference in flow velocity between the top and bottom will be alleviated, albeit slightly.

However, the purpose of the existing net is mainly to capture large debris such as driftwood, and the mesh is large, so in reality, the difference in flow velocity between the top and bottom is almost the same as when net 7) is not installed.

The present invention is a dust-proofing method that combines an existing net with a finer mesh net or a blind plate.

The fine-mesh net used for the ox is finer than the existing net (mesh size 50m+*), and preferably about 2 to 3 meshes.

The fine-mesh net may be a well-known plastic net such as vinyl chloride resin, or may be a metal net such as stainless steel if necessary, and an appropriate weight may be attached to the tip of the lower end of the fine-mesh net.

The fine-mesh net may be hung and installed on the outside of the existing net (hereinafter referred to as the outside) when viewed from the water intake tower, or it may be installed by entering from the water intake tower and placed inside the existing net (hereinafter referred to as the inside). It may be installed by hanging, and in short, it may be installed by combining an existing large-mesh net with a fine-mesh net.

As mentioned above, by hanging a fine-mesh net along with the existing net, the water flow near the ice surface of the dam is slowed down, and as a result, fine debris floating in the water moves away from the water flow and gradually reaches the bottom of the dam. It settles in the direction and is separated from the water flow, thus preventing the accumulation of fine dust at the water intake.

As mentioned above, when a fine-mesh net is attached to the outside of an existing net, the existing net located inside serves as a reinforcing material, so the fine-mesh net will remain taut. It can be made to hang down.

However, if a fine-mesh net is attached to the outside, large pieces of debris such as driftwood may come into direct contact with the fine-mesh net and damage the net.

Therefore, in such a case, damage to the fine-mesh net can be prevented by suspending and attaching a large-mesh net, which is the same as the existing net, further outside the fine-mesh net. In this case, it can also contribute to slowing down the water flow on the dam water surface, and damage to the fine mesh net can be greatly reduced.

Furthermore, when a fine-mesh net is attached inside an existing net, large-sized debris such as driftwood can be prevented from coming into direct contact with the fine-mesh net, thereby reducing damage to the fine-mesh net.

Further, if necessary, the fine mesh net may be woven into an existing large mesh net, or two nets may be bonded together to form a single piece. In this case, as mentioned above, it is not necessary to separately install the existing net and the fine-mesh net, and the work efficiency can be improved by simply attaching the existing net and the fine-mesh net separately.

However, depending on the situation, such as when the amount of water in the dam increases during the snow melting season, the purpose can also be achieved by suspending blind boards instead of the fine mesh net.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIGS. 2 and 3 show an example of a device for implementing the present invention, in which an existing net 4 with a mesh size of about 50 mg is attached to the opposite side of the floating pier 2 from the water intake tower.
A stud link chain 3 is attached as a weight to the lower end edge of the net 4 and is hung in tension.

On the other hand, a plastic net 5 (length approximately 1,800 mm) with a fine mesh (2 to 3 ways) is attached to the outside of the existing net 4, and a plurality of nets are attached to the lower edge of the net 5. Heavy loads 6 are attached at approximately equal intervals and suspended.

In addition, the symbol C in FIG. 2 is a cushion material made of rubber.

Although there are two floating piers 2 in Figure 2, in reality, as shown in Figure 1, multiple piers are connected and placed in front of the water intake tower 1. A net 4 and a fine-mesh net 5 are also stretched and suspended below the water surface over the entire length of the floating pier 2.

Large pieces of garbage such as driftwood are blocked by the existing net 4 as before, and fine pieces of garbage are also blocked by the fine-mesh net 5.

In addition, since a fine mesh net 5 is installed near the dam water surface, the water flow above the ice surface is decelerated, so that the fine dust floating in the water gradually settles and is separated from the water on the dam surface. The intrusion of fine dust is prevented, and there is almost no risk of fine dust accumulating at the water intake.

In the embodiment shown in FIG. 4 (the same symbols in FIG. 4 as in FIGS. 2 and 3 are the same members), a fine-mesh net 7 is suspended from the floating pier 2 inside the existing net 4. Since the water flow is directed from the existing net 4 to the fine-mesh net 7, large pieces of debris such as driftwood are blocked by the existing net 4, and driftwood, etc. are directly directed to the fine-mesh net 7. Since there is no contact with the net 7, damage to the fine mesh net 7 can be prevented.

Furthermore, since the water flow is blocked by the existing net 4, the flow velocity can be reduced, and fine dust that has passed through the mesh of the existing net 4 is prevented from entering by the fine-mesh net 7.

The embodiment shown in FIG. 5 (in FIG. 5, the same reference numerals as in FIGS. 2 and 3 are the same members) has a larger mesh than that shown in FIGS. 2 and 3. A net 8 is suspended from the floating jetty 2 on the outside of the fine-mesh net, so that the net has a triple structure. The net 8 has exactly the same mesh as the existing net 4. However, it is not necessary to limit the network to the same as the existing network.

In the case shown in FIG. 5, the net 8 with a large mesh is located on the outermost side with respect to the water flow, so large debris such as driftwood is blocked by the net 8, and the net 8 with a fine mesh located inside the net 8 blocks out large debris such as driftwood. Since the net does not come into direct contact with driftwood, etc., damage can be prevented, and since the net is triple-layered, it can also contribute to reducing the flow velocity on the surface of the dam water.

The one shown in FIG. 6 is a net 9 with a large mesh (mesh 5
It is made by laminating a fine-mesh net (0) to a fine-mesh net (mesh 2), and can be attached by hanging it from the floating pier 2 in the same way as the existing net 4. In this case, there is no need to separately attach the large-mesh net and the fine-mesh net to the floating pier, and work efficiency can be greatly improved.

The fine-mesh net used in the present invention has a hanging length of about 3,000 mm compared to the existing net (approximately 3,000 mm), as shown in Figures 2 and 3.
In the case of the embodiment shown in the figures, it is preferable to make it short (approximately 1800 degrees), and in the embodiments shown in Figs. 4, 5 and 6, it is approximately the same length as the existing net 4. .

In addition, if necessary, the net with a fine mesh can be used for a long period of time since damage to the net can be prevented by attaching an elastic body such as rubber to the suspended portion.

The method of the present invention can remove not only large pieces of garbage such as driftwood but also small pieces of garbage, so the work that conventional workers have to do to remove the garbage that has accumulated on the screens of water intake towers can be greatly reduced, improving work efficiency. It is possible to reduce the risk.

〔Effect of the invention〕

As described above, the present invention can improve the dustproofing of a dam water intake by simply installing a fine-mesh net over the existing net of the floating pier or installing a combination of blind plates. At the same time, it is possible to improve the labor of the worker and improve the efficiency of the work.

[Brief explanation of the drawing]

Figure 1 is a plan view of the vicinity of the dam water intake tower, Figure 2 is a perspective view of an example of the device used in the present invention, Figure 3 is a sectional view taken along the line ■-■ in Figure 2, and Figure 4 is a fine mesh A cross-sectional view of an embodiment in which the net is attached to the inside, Fig. 5 is a cross-sectional view of an embodiment in which the net has a triple structure, and Fig. 6 is a cross-sectional view of an embodiment in which a net with a large mesh and a net with a fine mesh are pasted together. FIG. 2: Floating pier, 3: Stud link chain, 4: Existing net), 5.7.10: Fine mesh net, 6: Heavy weight, 8, 9: Large mesh net. Patent applicant: Japan Heavy and Chemical Industry Co., Ltd. Agent
Rikichi Ichikawa Figure 1

Claims (5)

[Claims] (1) A combination of existing large-mesh nets and fine-mesh nets or blind boards are suspended from the outside of the opposite side of the water intake tower of the floating pier installed near the dam water intake tower, and suspended near the dam water surface. A dust prevention method for a dam water intake, which is characterized by limiting the flow rate of water. (2) The dam water intake according to claim (1), wherein the fine-mesh net is attached to an existing large-mesh net by hanging from the outside opposite to the water intake tower. How to prevent dust. (3) The dam water intake according to claim (1), characterized in that the fine-mesh net is suspended and attached to the inside of the water intake tower, with respect to the existing large-mesh net. Dust prevention method. (4) A fine-mesh net is suspended from the existing large-mesh net on the outside opposite to the water intake tower, and a large-mesh net is suspended from the outside of the fine-mesh net. The dust-proofing method for a dam water intake according to claim (1), wherein the dam water intake port is installed in a manner that the water intake port of the dam is sealed. (5) The dam water intake according to claim (1), wherein the fine-mesh net is woven into a large-mesh net or is a net formed by pasting the two nets together. How to prevent dust in your mouth.