JPH02225708A - Water permeable dam and construction thereof - Google Patents

Abstract

PURPOSE:To prevent the inflow of the earth and the like into a reservoir by piling up water permeable blocks consisting of soft bags of a sheet in which substances with specific gravity in excess of a specific value and having no obstruction to the water permeability are enclosed to connect with each other. CONSTITUTION:Water permeable blocks 3 consisting of flexible bags 5 of a permeable sheet 4 in which substances such as crushed stone, construction surplus soils and others with specific gravity in excess of a specific value 1 and having no obstruction to the permeability of the permeable sheet 4 are enclosed are piled up to the river inlet to a reservoir 1. After that, the permeable blocks 3 to be piled up are connected and fixed to each other with coupling pieces 6 attached to every permeable block 3, calkings, ropes and others to construct a permeable dam 7. The earth and others in the running water are dammed up by the permeable dam 7, namely, they are filtered to accumulate before the permeable dam 7 as a sediment 10, and the water only flows into the reservoir 1.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a dam constructed at the inlet of a river, particularly a small or medium-sized river, into a reservoir, and a method of constructing the same, more specifically,
It relates to a dam with a mechanism that allows water flow to pass through, but does not allow sediment, etc. to pass through.

[Prior Art and Problems to be Solved by the Invention] Generally, a reservoir receives inflow water from several small and medium-sized rivers. The current situation is that these small and medium-sized rivers have a high flow rate during rainy days, but almost no flow during sunny days. however,
Even when the flow is low on sunny days, small amounts of sediment flow into the reservoir.

Moreover, when it rains, a large amount of sediment flows into the reservoir. Currently, reservoirs are gradually being filled in by the influx of sediment from small and medium-sized rivers, reducing their water storage capacity.

To prevent the inflow of earth and sand into the reservoir, it is possible to install weirs at the mouths of small and medium-sized rivers, but if we install so-called regular weirs, it will depend on the steady flow of water. This will affect the amount of water received, and if the flow increases, weirs may burst, etc.
Because it involves many problems, it is a difficult technique to prevent the inflow of earth and sand and maintain a balance with the receiving water.

As a result of intensive research aimed at solving the above-mentioned problems in reservoirs, the present invention is capable of preventing the inflow of earth and sand into the reservoir without affecting the amount of water flowing into the reservoir (the amount of water received). This was the successful development of a dam by the organization.

[Means to solve the problem]

The present invention provides a water-permeable flexible D-rug made of a highly water-permeable sheet and equipped with a mechanism that enables mutual connection, with a specific gravity of 7 or more and a weave of 1m of the water-permeable sheet. Permeable blocks, which are filled with substances that do not pass through mesh or mesh and do not impede water permeability, are stacked at the inlet of a river into a reservoir, and the blocks are connected to each other to build a dam. This achieved the purpose of preventing the inflow of sediment, etc., while maintaining the required amount of inflow water.

The highly permeable block for constructing the permeable dam of the present invention is a permeable flexible nog.
It does not impede the water permeability of the rug and has water permeable gaps, that is, texture 1.
It is made by enclosing a substance with a specific gravity of 1 or more that does not pass through the mesh or mesh, but in order to provide a highly water permeable block, a water permeable As the sheet material, a net-like sheet is preferable, and one whose mesh size is larger than or equal to oO mesh has the water permeability function of the block
It also has a sand-preventing function.The substance sealed inside the rug is the first stitch of the d-rag.

It must be of a size that does not pass through the mesh, and since the blocks are mainly piled up in water, the specific gravity of the enclosed substance must be 7 or more.

The permeable block that constructs the permeable dam of the present invention is used under severe conditions. Therefore, the permeable sheet that makes up the flexible tongue as a component of the permeable block has a high breaking strength. You have to use a good one.

A flexible bag made of a water-permeable sheet with a tensile strength of 20 Kl/j cm or more can provide a water-permeable block with sufficient strength.

In other words, the water-permeable sheet material for creating the A-rug is as follows:
Although some high-strength knitted and woven fabrics can be used, it is preferable to use high-strength strings, mesh sheets woven from wire, etc., wire mesh, and the like.

On the other hand, the substance to be sealed in the above-mentioned S-rag needs to be of a size that does not pass through one stitch or mesh of the water-permeable sheet that makes up the D-rag, and has a specific gravity of 7 or more. 2. For example, in addition to crushed stone, industrial waste such as construction residue, iron scraps, and shells can be used.

The purpose of the dam of the present invention is to always ensure the amount of water flowing from the river to the reservoir, while also exerting a mechanism to dam the earth and sand carried by the water flow. The blocks must not only have the function of damming up earth and sand, but also have excellent water permeability.

In order to fully exhibit both of these functions, it is preferable that the permeability coefficient of each individual block, that is, the water-permeable block, is t 10 crrV'eea or more.

The dam of the present invention is constructed by piling up a large number of blocks as described above, and in order to eliminate the risk of collapse due to water flow when the river water rises, the dam is constructed so that the blocks can be connected and fixed to each other. The Ic feature is that the blocks are connected to each other using a connecting mechanism provided in each block.

The present inventor has previously proposed a block with an interconnection mechanism in Japanese Patent Application No. Sho JJ-2417!74. The second method is to use a rope, caulking, etc. to fix the connecting pieces attached to the ζ lugs. The second method has the advantage that the blocks can be brought into close contact with each other and firmly fixed.

The size of the blocks used in constructing the dam of the present invention is not particularly limited, but relatively large blocks are effective in view of the function and strength of the dam structure. Furthermore, the blocks of the present invention have deformability as a feature of their construction, and therefore fit well against irregularities in the river bed or mutual deformation due to the blocks being pressed together, so that a stable dam can be constructed.

Thanks to the permeable dam of the present invention, the water flowing into the reservoir from the five rivers does not contain any sediment.

Since this earth and sand is dammed up and accumulated in front of the permeable dam, it is extremely easy to carry out the earth and sand.

Naturally, if there is a water cap that exceeds the water permeability of the dam, the overflow will flow into the reservoir, and excessive water pressure will be applied to the dam.
In such a situation, the button will not be activated.

〔Example〕

The permeable dam of the present invention will be explained in more detail below with reference to the drawings.

FIG. 1 is a schematic cross-sectional view of a permeable dam of the present invention constructed at an estuary. Flexible bag made from water-permeable sheet μ! Then, permeable blocks 3, which are made of crushed stone, construction waste soil, etc., and are filled with substances that have a specific gravity equal to or higher than that and do not inhibit the permeability of the permeable sheet≠, are piled up on the river inflow row to the reservoir l, and each permeable block is The water permeable dam 7 is constructed by connecting and fixing the stacked water permeable blocks 3 to each other by caulking or using ropes or the like to connect the connecting pieces 6 attached to the water permeable blocks 3.

The flowing water t passes through the permeable block 7 constructed above and is stored in the reservoir as inflow water, but in this case, the earth and sand in the flowing water is Damped, i.e. filtered, permeable dam7
It is deposited as sediment 10 before 0, and there is only water in the reservoir l.

There will be an influx.

Figure 2 shows the steps taken when constructing the permeable dam 7 (Figure 1).
FIG. 3 is a partial perspective view illustrating a state in which water permeable blocks 3 are connected to each other.

They were piled up at the river inlet (Figure 1). Each water permeable block 3 is connected and fixed to each other by connecting pieces 6 attached to each water permeable block 3. This connecting piece 6 is
Water permeable sea) When making a flexible 1 piece with 4j, the flexible 2 pieces! K. It is fixedly formed and has appropriate holes etc., so that it can be connected with, for example, a rope.

〔Effect of the invention〕

The dam of the present invention is permeable, that is, a dam that allows water flow to pass through it without stopping the flow of water from a river to a reservoir.
It has a so-called filtration function, which has the effect of preventing the inflow of earth and sand, etc., in order to reduce the amount of water stored in the reservoir while ensuring the amount of inflow water.

Each of the permeable dams of the present invention has permeability and is easily deformable, and can be applied to deformed surfaces such as riverbeds and riverbanks, or by lines and ζ lugs (in close contact with each other; so-called permeability). Since they are constructed by stacking them up, they also have the advantage of being easy to construct and repair.

(9) The permeable dam of the present invention is located at the inlet of a river, especially a small or medium-sized river, into a reservoir, and prevents the inflow of earth and sand, which is the cause of securing the amount of inflow water and reducing the water capacity of the reservoir. are to be executed at the same time.

Its contribution is extremely large.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an example of a permeable dam according to the present invention, and FIG. 1 is a perspective view showing permeable blocks and their connected state for constructing the permeable dam. l...reservoir, c...river inlet, 3...permeable block, l...permeable sheet! ...Flexible node 2g, t...Connection piece, 7...Permeable dam, r
...Running water, Ri...Inflow water, 10...Sediment.

Claims (6)

[Claims] (1) A flexible water-permeable bag made of water-permeable sheets and equipped with a mechanism that allows them to be connected to each other, has a specific gravity of 1 or more, and does not pass through the textures, stitches, or meshes of the water-permeable sheets. A permeable dam is constructed by piling up permeable blocks at the inlet of a river into a reservoir, and connecting these blocks to each other. (2) The water-permeable dam according to claim (1), wherein the water-permeable sheet forming the water-permeable flexible bag is a mesh sheet of 300 mesh or more. (3) The permeability coefficient of the permeable block is 10^-^3cm/
Sec.
Permeable dam described in section 2). (4) A flexible water-permeable bag made of water-permeable sheets and equipped with a mechanism that allows them to be connected to each other, having a specific gravity of 1 or more and not passing through the textures, stitches, or meshes of the water-permeable sheets; A method for constructing a permeable dam, which comprises piling up permeable blocks at the inlet of a river into a reservoir, and connecting these blocks to each other. (5) The method for constructing a water-permeable dam according to claim (1), wherein the water-permeable sheet used to make the water-permeable flexible bag is a mesh sheet of 300 mesh or more. (6) The permeability coefficient of the permeable block is 10^-^3cm/
sec or more, claim (4) or (
5) The method for constructing a permeable dam as described in section 5).