JPH0372106A - Purify method for river on one riverbank side - Google Patents

Abstract

PURPOSE:To reduce the cost required for purifying river water on one riverbank side by attaching a weight stone to the lower end of the sheet to fix the lower end to the riverbed and disposing the sheet from the water surface to the riverbed by means of floating bodies each of which are attached to the upper end of the sheet, and introducing clear water between the sheet and one riverbank side. CONSTITUTION:A weight stone 4 is attached to the lower end 1a of a sheet 1 and the lower end 1a is fixed to a riverbed 2A or that riverbank 2B which is submerged. Floating bodies 5 aligned in the direction of water flow are each attached to the upper end 1b of the sheet 1 and the sheet 1 is disposed from the water surface 2C to the riverbed 2A by the floating bodies 5. Clear water 6 is introduced between the sheet 1 and one riverbank 3A and the muddy waters 7 of the river 2 are separated by the sheet 1 from the clear water 6 which is caused to flow on the side of the riverbank 3A.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for clearing a river near one bank, and more specifically, a sheet with a floating body attached to the upper end and a weight attached to the lower end is moved from the water surface to the river bed. This relates to a method in which the sheets are arranged in the water flow direction between the sheets, and the sheet separates the flowing water of the river into one side of the riverbank and the other side, and then introduces fresh water to one side of the riverbank to maintain the water flow as a clear stream. be.

[Conventional technology]

Waste and pollutants generated as a result of the development of various industries and the improvement of people's livelihoods flow into rivers, resulting in water pollution in rivers, ponds, and lakes, and the destruction of the natural environment has become a problem. this is,
This is due to the accelerating rate of pollution exceeding the purifying ability of nature, but it is hoped that the natural environment, rich in greenery and rich in fish, will be restored in all areas, both urban and rural, and efforts are being made to achieve this goal. I'm looking forward to it. For example, in rivers, water purification plans are being implemented in many places to eliminate river pollution that prevents fish from living there.

[Problem to be solved by the invention]

By the way, in order to purify the flowing water of a large river, it is necessary to thoroughly purify the entire flowing water by eliminating sources of pollution, which poses the problem of requiring enormous costs. For example, even if you try to purify some of the running water in a river, the amount of water in the river is large, so the purified running water is mixed with unpurified polluted water, making it impossible to expect a purification effect. It is often extremely difficult.

The present invention was made in view of the above-mentioned problems, and its purpose is to reduce the cost of cleaning the river bed and water surface, instead of taking drastic measures to purify the entire river water. A sheet placed in between separates the flowing water of the river into one riverbank and the other riverbank, allowing fresh water to flow toward one riverbank, and giving the clear stream a biological purification effect. Furthermore, it is an object of the present invention to provide a method for clearing a river near one bank by increasing the roughness of the riverbed and physically reducing the flow velocity to promote purification.

[Means and effects for solving the problem] As shown in Fig. 1, the sheet 1 is stretched in the water flow direction to separate the flow of the river 2 into left and right sides, and a clear stream flows between the sheet 1 and one riverbank 3A. This is a method of

This is done by attaching a weight 4 to the lower end 1a of the sheet 1, and attaching the lower end 1a to the river bed 2A or the submerged part of the river bank.
It is fixed at B. Floating bodies 5 aligned in the water flow direction are attached to the upper end 1b of the sheet 1, and the floating bodies 5 position the sheet 1 between the water surface 2C and the riverbed 2A, and fresh water 6 is introduced between the sheet 1 and one riverbank 3A. do. The length l of the sheet 1 from the riverbed 2A to the water surface 2C is selected so that the floating body 5 can be raised and lowered according to changes in the water level, so that even if the water volume increases, the turbid flow 7 of the river 2 and one river bank Clear stream 6 near 3A
and can be separated at all times.

As shown in FIG. 5, the introduction of fresh water 6 is carried out by
A clear stream 6 of a river where clear water flows at a point N where
All or part of the information may be supplied.

As shown in FIG. 6, the fresh water 6 is introduced with the upstream area between the sheet 1 and one riverbank 3A closed.
Alternatively, water 8 treated with sewage may be supplied.

As shown in FIGS. 7 and 8, the roughness of the riverbed 2A may be increased between the sheet 1 and one riverbank 3A.

As shown in FIG. 9, the fresh water 6 is introduced from the upstream end 9 which is narrower than between the sheet 1 and one river bank 3A, and the gravel 10 is introduced between the sheet 1 and one river bank 3A. [10th
[See figure] It is recommended to use the river bed 2A or river bank 2B, which is rich in water.

As shown in FIG. 10, the gravel 10 on the river bed 2A or river bank 2B is arranged in three or four layers.

As shown in FIG. 11, air may be blown out from the lower layer 10a of the gravel 10.

In addition, as shown in FIG. 1, it is preferable to draw the floating body 5 to the riverbank 3A and fix it there to prevent the sheet 1 from being washed away during a flood.

〔Effect of the invention〕

According to the present invention, the sheet placed between the river bed and the water surface separates the flowing water of the river into one river bank and the other river bank, and allows the clear stream to flow through one river bank, so that the entire flowing water is The cost required for purification can be significantly reduced compared to the purification of

Furthermore, while the clear stream flowing along one riverbank is biologically purified by the gravel-laid riverbed and submerged riverbank, the roughness of the riverbed is increased and the flow velocity is physically reduced.
The purification effect is easier to receive, so the purification of clear streams is promoted.
Rivers will be purified. It is also possible to prevent the sheet from being washed away during floods.

〔Example〕

Hereinafter, purification to which the present invention is applied and its effects will be described in detail based on examples with reference to the drawings.

In FIG. 1, an anchor block 11 for restraining the movement of the lower end 1a of the sheet l and mooring the sheet l is installed on the river bed 2A of the river 2 where water flows perpendicularly to the paper surface.
It is fixed with an anchor bolt 12a. The sloping riverbank 2B that is submerged from the side end 2a of the riverbed 2A rises up to form an embankment 3 that reaches one riverbank -3A. An anchor block 12 fixed with anchor bolts 12a is installed on the embankment 3 to prevent the sheet 1 from being washed away in the event of a flood. The anchor block 11 described above may be fixed to the sloping riverbank 2B, but in this example, it is provided on the riverbed 2A as described above.

The sheet l placed in flowing water along the water flow direction M of the river 2 (see Figure 2) is a prevention sheet made of cloth with a certain thickness, such as a water-stop mat used in civil engineering work. is used.

The upper end 1b of this sheet 1 is located at the seam 1 of the overlapped ends.
3 (see FIG. 2) and a mirror body 14 made of aluminum or the like to form a space 16 that encloses a plurality of (six in the figure) floating bodies 5 and extends in the water flow direction M. See Figure 3]. The floating body 5 has a cylindrical shape, is made of styrene foam, ABS resin, or the like, and exhibits extremely large buoyancy so that the seat 1 is in an almost upright position.

As shown in FIG. 2, one end of the space 16 of the sheet IA is inserted and coupled to the other end of the space 16 of the other sheet IB, and as shown in FIG. become heavy,
It is fixed by a seam 13 and a mirror body 14. C) IB
One end of the sheet IC is also inserted and coupled to the other end of the sheet IC. In this way, a series of sheets 1 that are continuous in the water flow direction M are formed.

On the other hand, a space 18 for storing the weight 4 is formed at the lower end 1a of the sheet l shown in FIG. This space 18 is
Similar to the space 16 described above, it is formed by fixing the seam 13 and the mirror body 14.

Also, at the joint part of sheets IA to IC, the upper end 1
It is the same as b. The weights 4 stored in such a space 18 are lowered into the river bed 2A to prevent the sheet 1 from being washed away. Further, below the seat 1 @la and slightly above the mirror body 14, a wire lobe 19 is attached to a ring 19.
Disconnection is stopped at a, and the connection is established.

The other end of the wire lobe 19 is secured to the protruding member 11b of the anchor block 11 on the riverbed 2A, and the lower end 1a of the sheet 1 is movable in the riverbed 2A due to the weight action of the weight 4 and the securing action of the wire lobe 19. is being restrained.

Note that the width of the sheet l that partitions between the river bed 2A and the water surface 2C, that is, the length l in the depth direction, can change from the steady water level of the river to the rising water level during a flood, and the floating body 5
It is selected so that it can be lifted and lowered. As a result, the left water area 2F of the river 2 where the turbid water 7 flows even if the water increases, and the right water area 2E near the river bank 3A where the fresh water 6 flows down.
Always separated.

When introducing fresh water 6 into the right water area 2E of the river 2 partitioned by the sheet 1, as shown in FIG.
River 2Y through which turbid stream 7 flows and river 2X through which clear stream 6 flows
It is provided at the point N where the two meet. That is, a weir 20 that partially protrudes above the water surface 2C is arranged so as to open at a location where fresh water 6 flows, and the sheet 1 is connected to the opening 20a near the riverbank 3A, so that the sheet 1 is placed in the water flow direction M. It will be extended along the line. The sheet 1 partitions the right water area 2E near one river bank 3A of the river 2 after merging, and the left water area 2E.
Water that is a mixture of the turbid stream 7 and the clear stream 6 will flow through F. A part of the clear water 6 flowing through the river 2X is supplied to the right water area 2E, and a flowing portion of the right water area 2E in which the clear stream 6 is maintained is formed in the river 2 that merges with the river 2. In addition, if the opening 20a of the weir 20 mentioned above is widened so that the entire amount of fresh water 6 at the merging point N is taken into the right water area 2E, a clear water area with a large amount of water can be formed in the river 2. .

Figure 6 is an example of artificially introducing fresh water 6, where the right water area 2E
Fresh water 6 or treated sewage water 8 is supplied from a ditch 21.

In the river 2 of this example, a bank 22 is provided upstream between the sheet 1 and one riverbank 3A to dam the turbid stream 7 flowing from the river 2. Therefore, the turbid stream 7 flowing through the river J112 does not enter the right water area 2E, and the clear stream is maintained with the fresh water 6 coming only from the ditch 21.

The clear stream 6 is supplied at the point N where the clear water 6 and the turbid stream 7 shown in FIG. 5 meet, or the clear stream 6 is supplied from the ditch 21 shown in FIG.
As shown in FIG. 7, one or more layers (one layer is shown) of gravel 10 is laid in the right water body 2E where the water is taken in, in order to increase the roughness of the river bed 2A. In this right-hand water area 2E, compared to the case where no gravel 10 is laid, the flow velocity flowing near the gravel 10 is physically slower;
The clean water 6 can be purified further by the aquatic plants, algae, etc. and microorganisms that occur in the clean water 6.

A water dike 23 may be constructed in the right water area 2E, with a stagnation 24 separating the water flow as shown in FIG. 8, which enables the water flow to be reversed. This is also called a water system, and has the function of restricting the flow by restricting the flow path and avoiding collision of water flows, and for example, a large number of tetrapods 23A are stacked. When the clear stream 6 passes through or above the gap between the tetrapods 23A, it causes a reverse flow and becomes slower.

The running water is purified by aquatic plants, algae, and microorganisms that have grown in the tetrapot 23.

As shown in FIG. 9, a weir 25 is built at the upstream end 9 of the right water area 2E, and the weir 25 consists of a part that comes out from the water surface 2C and a submerged part, and a water intake part 25a of the submerged part. The width is narrower than that between the sheet 1 and one riverbank 3A. Therefore, since the amount of fresh water 6 introduced from the water intake part 25a is limited, the water flow rate in the right water area 2E is significantly slower than in the left water area 2F. If the river bed 2A or river bank 2B connected to the river bank 3A is filled with gravel 10 by laying gravel 10 (see Figure 7), etc., the flow velocity will be further reduced and the purification effect will be more likely to be obtained. .

Figure 1O shows the river bed 2A or river bank 2B of the right water area 2E.
This is an example where the gravel IO has three or four layers. gravel 10
is packed into the serpent n2B and forms an immovable layer. According to a study, in a layer of gravel 10 laid in a water stream, there is no clogging up to the first and second layers that are in contact with the water stream, and the biological purification activity in those areas is high, resulting in a strong aquatic biological reaction. It has been reported that the purifying effect of Compared to a flat riverbed or riverbank, the purification activity in the area where the layer of gravel 10 is formed is increased 3 to 7 times. If gravel IO is laid down in three or four layers as in this example, it is possible to maintain the purification effect by biological reaction taking into account resilience after flooding.

FIG. 11 shows an example in which three or four layers of gravel 10 are laid on the submerged riverbank 2B, while eight or nine layers of gravel 10 are laid on the riverbed 2A.

In the former, there is no clogging in the first and second layers and the purification activity is high, while in the latter, clogging occurs in the lower layer 10a of the gravel 10, that is, the lower layer 10a surrounded by the thin dot-dash line, and the riverbed 2A Purification activity decreases.

Therefore, in order to eliminate clogging in the lower JfilOa and purify it, an air conveying pipe 26 for blowing air into the lower NIOa is buried. The air conveying pipe 26 is a double pipe, and the inner pipe 2 has an air blowing hole 26b.
6A and an outer tube 26B provided with an air blowing hole 26c, and is held by a support member 26a. The pressurized air flowing through the inner tube 26A blows out through the air outlet 26c of the outer tube 26B, preventing clogging in the lower layer 10a, and increasing the purifying activity of the gravel IO above the thick two-dot chain line L2. Thus, purification of the clear stream 6 flowing through the right water area 2E is facilitated.

By the way, in the river 2 shown in FIG. 1, the clear water level rises above the steady water level 2C due to the rise in water level due to flooding, and it is necessary to prevent the sheet 1 and the floating body 5 from being washed away due to increased water and flow velocity.

For this purpose, as shown in the diagram, the sheet 1m is indicated by the two-dot chain line.
The length in the depth direction is made larger than l in the case of the sheet 1, and a wire row 127 shown by a chain double-dashed line is connected to a slightly lower part of the five floating bodies, and the ring 27a prevents the floating body from being pulled out. This wire rope 27 is arranged along the submerged riverbank 2B, and the other end is connected to the anchor block 12 installed on the embankment 3. In the event of a flood, the floating body 5 is drawn to the riverbank 3A via the ring 27a, and the ring 2
By tying the sheet 7a to the protruding member 12b of the anchor block 12, the sheet 1 can be prevented from being washed away in the event of a flood.

If the right basin 2E through which the clear stream 6 flows is provided along a park or promenade, park visitors can enjoy the flow of the clear stream 6 up close.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of a river with a clear stream section formed by a sheet, Figure 2 is a partial view of the sheet surface viewed from the ■-■ line in Figure 1, and Figure 3 is the ■-- in Figure 2. ■A sectional view taken along the line, Fig. 4 is a sectional view taken along the line IV-IV in Fig. 2, Fig. 5 is a schematic diagram of an example in which a sheet is provided where a murky stream and a clear stream meet, Fig. 6 Figures 7 and 8 are schematic diagrams of the case where fresh water is introduced from a ditch, Figures 7 and 8 are diagrams of the riverbed where gravel and dams have been laid, and Figure 9 is a section separated by a sheet. A schematic diagram of an example in which river water is partially taken in, and Figures 1O and 11 are diagrams of the formation of gravel layers laid on the river bed and the river bank in the submerged portion. 1, IA-IC, 1m-sheet, 1a-bottom end, 1b-
・-Top end, 2・-river, 2A-riverbed, 2B-submerged riverbank, 2C-water surface, 3A--one riverbank, 4
- Weight, 5- Floating body, 6- Clear stream (Shimizu), 7- Muddy stream, 8
...-treated sewage water, 9-upstream end, 10--gravel,
10a-lower layer, jl-length (length in depth direction), M...
・Water flow direction, N - point where it merges. Figure 9

Claims (8)

[Claims] (1) In this method, a sheet is stretched in the direction of water flow to separate the river flow into left and right sides, and the area between the sheet and one riverbank is cleared.A weight is attached to the bottom end of the sheet, and the bottom end is placed on the riverbed or submerged in water. The above sheet is fixed to the riverbank where it is located, and floating bodies are attached to the upper end of the sheet that line up in the direction of the water flow.
A sheet is placed between the water surface and the riverbed using the floating body, fresh water is introduced between the sheet and one riverbank, and the length of the sheet from the riverbed to the water surface is adjusted according to changes in the water level. The river was selected in such a way that it could be raised and lowered, and the muddy current of the river could always be separated from the clear stream of the river, even if the water volume increased. How to clear water. (2) The introduction of fresh water supplies all or part of the clear water of the river at a place where the turbid stream and the clear stream meet, near one bank of the river as set forth in claim 1. How to clear water. (3) The introduction of fresh water is performed by supplying fresh water or sewage-treated water with the upstream area between the sheet and one river bank closed. A method to make the river near the river bank clearer. (4) The method for making a river near one bank clearer according to claim 2 or 3, characterized in that the roughness of the river bed is increased between the sheet and one river bank. (5) The above-mentioned fresh water should be introduced from the upstream end which is narrower than the space between the above-mentioned sheet and one riverbank, and the gap between the above-mentioned sheet and one riverbank should be a riverbed or riverbank rich in gravel. A method for clearing a river near one bank according to claim 1. (6) The method for making a river near one bank clearer according to claim 5, characterized in that the gravel on the river bed or river bank is arranged in three or four layers. (7) The method for making a river near one bank clearer according to claim 6, characterized in that air is blown out from the lower layer of the gravel. (8) The method for clearing a river near one bank as set forth in claim 1, wherein the sheet is prevented from being washed away during a flood by drawing the floating body to the river bank and fixing it there.