JP3740146B2 - Pollution diffusion prevention membrane - Google Patents

Description

  The present invention mainly prevents the nutrients flowing in from the river from advancing and diffusing into the downstream dam reservoir, and the inflowing water from the river containing the pollutant is retained in the upstream water area for a long time, so that the pollutant is upstream. It is related with the pollution diffusion prevention film which prevents pollution of a downstream water area by making it settle at a part.

  Because water is stored in the dam reservoir for a certain period of time, nutrients such as nitrogen and phosphorus flowing from the river upstream of the dam flow into the reservoir, and freshwater red tide and blue sea bream occur due to abnormal growth of algae The eutrophication phenomenon may occur.

  During floods, turbid water containing earth and sand flows into the dam reservoir. Depending on the particle size and quantity of the inflowing sediment, the dam operation method, etc., turbid water will flow from the dam reservoir to the downstream river after the flood. The phenomenon that discharge is continued may occur.

  Therefore, in order to prevent nutrient salts and turbid water flowing from the river upstream from the dam reservoir from advancing and diffusing into the dam reservoir, a pollution diffusion prevention film (fractionation fence) is installed in the upstream area of the reservoir. And sedimentation of muddy water.

  As an example of a muddy water diffusion prevention film applicable to such a purpose, a curtain part (film body) made of a polyester water-permeable sheet and a rubber wear-resistant sheet is suspended from the float. Has been proposed. (See Patent Document 1).

  When a pollution diffusion prevention membrane with this structure is installed in a river upstream of the dam, when the water flow is moderate, clear water near the surface of the water will flow down through the water-permeable sheet that forms the upper half of the curtain. The lower half of the curtain part made of a wear-resistant sheet hangs deeply in water to prevent the diffusion of muddy water.

However, when a typhoon or heavy rain increases, the water volume increases and the water flow becomes faster, as described above, a single sheet that combines the water-permeable sheet and the wear-resistant sheet to constitute the curtain portion. Then, regardless of the water permeability that forms a part of the curtain part, the curtain part is subjected to a strong water pressure over the entire surface, and the curtain part may be damaged early.
Japanese Utility Model Publication No. 1-174425.

  The present invention allows clear water to flow almost without resistance through the gap between the skirt that hangs down near the surface of the water and the curtain that hangs deeply under the water when the water flow is slow, and the volume of water is increased by the occurrence of typhoons or heavy rain. In response to a situation in which the water flow becomes faster, the water flow is skillfully used to pull up the curtain portion through the skirt portion, causing the polluted water to flow down to the lower part of the curtain portion to cause the polluted water downstream. An object of the present invention is to provide a muddy water diffusion prevention film capable of preventing diffusion of water.

  The polluted water diffusion prevention film of the present invention made to achieve the above object comprises a main float part, a skirt part having a sub-float, and a curtain part having an underwater float, and a main float lower part and a curtain part upper end part. Are formed by connecting a plurality of connecting ropes to form a gap, and a lower end portion of the skirt portion is movably connected to the connecting rope corresponding to the gap via a fitting.

  According to the present invention configured as described above, when the anti-pollution membrane is installed in the river upstream of the dam, the main float and the sub-float floating on the water surface come close to each other when the water flow is moderate, and the water surface A gap is created between the skirt that hangs down and the curtain part that hangs deeply underwater and is connected to the main float via a connecting rope. Let it flow down. At this time, since the skirt part hanging from the sub-float part floating on the water surface is relatively easy to move, fresh water near the water surface flows down along the skirt part.

  On the other hand, the curtain part hangs deeply in water and retains the inflow water containing the pollutant for a long time, thereby preventing the diffusion of the polluted water.

  Also, in response to a situation where the volume of water increases due to the occurrence of a typhoon or heavy rain, the sub-float that floats on the surface of the water is forcibly pulled away behind the main float by the water flow, and the skirt rises along with this. Then, the coupling fitting at the lower end of the skirt part pulls the curtain part by pulling it while moving the connecting line downstream. In this way, the curtain portion is pulled up from the river bottom to the water surface, reducing the water pressure load on the curtain portion and making it difficult to break.

  Also, the lower part of the curtain part that has a weight under the water flow that is underwater and tries to push the curtain part to the downstream side is blown down and pushed to the downstream side to bend toward the river bottom and become polluted. Highly polluted water is directed toward the bottom of the river to reduce diffusion to downstream areas.

  In the above configuration, weights are attached to the lower side of the skirt part and the lower side of the curtain part, respectively. Therefore, when a rope-like weight is attached to the lower side of the skirt part and a chain-like weight is attached to the lower side of the curtain part, the contact of the lower side of the skirt part with the connecting rope connecting the main float part and the curtain part is moderate. Since it is performed via a rope-like weight to which bendability is imparted, there is no deformation that the lower end of the skirt portion undulates and the connecting rope does not get entangled with the lower side of the skirt portion, and for a long time The stretchability of the skirt can be stabilized. The weight attached to the lower part of the curtain part may be a flat bar type that attaches the lower part of the skirt part from both sides, but the chain weight is easy to obtain and easy to handle. This makes it easy to remove and attach the lower part of the curtain.

  In the above configuration, the buoyancy of the sub-float is set to be larger than the weight of the rope-like weight attached to the lower side of the skirt portion, and the buoyancy of the underwater float is set to be smaller than the weight of the chain-like weight attached to the lower side of the curtain portion. Then, as a return to the original shape after undergoing a morphological change due to external force, the skirt part with a small hanging width from the sub-float to the water is caused by a rope-like weight having flexibility attached to the lower side of the skirt part. It is done smoothly. Moreover, since the curtain part which enlarges the drooping width in water is given by overcoming the buoyancy of the underwater float which is in the water and always shows a tendency to float, the return to the original state becomes faster. Further, since the buoyancy of the main float always synergistically acts on the buoyancy of the underwater float, the load on the main float can be reduced and the main float can be downsized.

  According to the pollution diffusion preventing membrane according to the present invention, when the water flow is gentle, the fresh water near the surface of the water is allowed to flow almost without resistance, and the water flow is skillfully handled in response to the occurrence of a typhoon or heavy rain. The skirt that hangs down near the surface of the water is pulled up, and the underwater curtain is lifted to eliminate the gap between the skirts, and the highly polluted water is guided to the river bottom through the curtain. It effectively prevents the diffusion of polluted water into the basin, exhibits stable performance over a long period of time, and is convenient for handling.

  Hereinafter, the pollution diffusion preventing film according to the present invention will be specifically described with reference to the drawings.

  1 is a longitudinal sectional view of a pollution diffusion preventing film according to an embodiment of the present invention, FIG. 2 is a partial front view of the pollution diffusion preventing film, and FIGS. 3A and 3B are partial front views of a main float portion. 4 (a) and 4 (b) are a partial front view and a longitudinal sectional view of a skirt portion having a sub-float, and FIGS. 5 (a) and 5 (b) are a portion of a curtain portion having an underwater float. FIG. 6 is a schematic vertical cross-sectional view of a pollution-diffusion prevention film for explaining the operating procedure in the installed state.

  In the figure, the pollution diffusion preventing film according to the present invention includes a main float portion 1, a skirt portion 2 having a sub-float 3, and a curtain portion 4 having an underwater float 5.

  The main float portion 1 has a plurality of cylindrical floats 6 made of expanded polystyrene or the like mounted in a float cover 7 sewn with vinyl chloride resin or the like, and a tension belt 8 made of a fiber belt made of polyester or the like below the cover 7. Although not shown, both ends of the tension belt 8 are bolted with connecting fittings each having an annular connecting fitting (a D ring is used in the embodiment).

  Further, the float cover 7 is wound around at an appropriate interval, and the reinforcing belt 9 is sewn on the tension belt 8 and is sewed on the tension belt 8. 11 is bolted.

  In the skirt portion 2 having the sub float 3, like the main float portion 1, a plurality of cylindrical floats 3 are mounted in the float cover 12, and a tension belt 13 is sewn to the lower portion of the cover 12. The skirt 14 is suspended from the skirt 14, and a rope-like weight 15 made of a lead rope or the like is sewn on the lower side of the skirt 14.

  Further, in the skirt portion 2, the float cover 12 is wound around corresponding to the reinforcing belt 9 of the main float portion 1, and reaches the sewing portion of the rope-like weight 15 on the lower side of the skirt portion 2 through the tension belt 13. A reinforcing belt 16 is sewn, and a connecting fitting 18 having an annular connecting fitting 17 at the lower end of the skirt portion is bolted to the reinforcing belt 16 in the vicinity of the rope-like weight 15.

  The curtain portion 4 having the underwater float 5 is sewn with tension belts 20 and 21 along the upper and lower sides of the curtain 19, and a plurality of cylindrical floats 5 are provided at an appropriate interval with respect to the curtain upper side tension belt 20. Are attached equally, and a chain-like weight 22 is attached to the tension belt 21 on the curtain lower side via a hanger 23.

  Further, in the curtain portion 4, a reinforcement belt 24 that reaches the curtain lower side tension belt 21 from the upper curtain side tension belt 20 is sewn corresponding to the reinforcement belt 16 of the skirt portion 2, and the upper curtain side tension belt 20 is sewn. Therefore, a connecting fitting 26 having an annular connecting fitting 25 is bolted to the upper end portion of the reinforcing belt 24.

  In the pollution diffusion preventing film according to the present invention, the skirt 14 of the skirt part 2 and the curtain 19 of the curtain part 4 are made of a sheet or cloth made of a flexible material used in a conventional pollution diffusion prevention film. Can be used. The material is not particularly limited, and synthetic resin, chemical fiber, rubber, and the like are used.

  The main float part 1, the skirt part 2 having the sub-float 3, and the curtain part 4 having the underwater float 5 are transported to the installation site and connected to each other using a plurality of connecting ropes 27 made of wire ropes or the like. Combined for use.

  For this connection, the connecting cord 27 is inserted into the connecting bracket 17 at the lower end of the skirt portion 2 and one end (upper end) of the connecting cord 27 is connected to the connecting bracket 10 of the tension belt 8 of the main float portion 1 through a shackle or the like. The other end (lower end) of the connecting cable 27 is connected to the connecting bracket 25 of the tension belt 20 on the curtain upper side via the shackle or the like.

The length of the connecting rope 27 at this time is set according to the conditions of the installation place,
A gap is formed between the lower part of the main float part 1 and the curtain part 4, but at the minimum, the main float part 1 and the sub float 3 float on the water surface and are sewn to the lower side of the skirt part that hangs down from the sub float 3 into the water. The length is set such that the rope-like weight 15 does not interfere with the underwater float 5.

  According to the present invention having the above-described configuration, for example, when installed in a river or the like in the upstream area of a dam reservoir, the main float portion 1 and the sub-float 3 come close to each other on the surface of the water when the river water flow is moderate. The fresh water near the water surface rises almost without resistance through the gap between the skirt part 2 that hangs down near the water surface and the curtain part 4 that hangs down deeply in the water. The hanging curtain part 4 stays at the bottom of the river for a long time so that the pollutant is settled and the downstream water area is prevented from being polluted.

  In response to a situation where the volume of water increases due to the occurrence of a typhoon or heavy rain, the subfloat 3 floating on the surface of the water is forcibly pulled away behind the main float portion 1 by the water flow, and the skirt portion 2 is connected to this. As shown in FIG. 6, the connecting bracket 17 at the lower end of the skirt portion 2 moves on the connecting rope 27 to the curtain portion 4 side and pulls up the curtain portion 4 in the water so that a gap between the skirt portions 2 is formed. Eliminate. Thus, the curtain section 4 is subjected to a flowing water pressure that tries to push the curtain section 4 downstream, and the curtain section 4 is caused to wake in the side view by the action of the weight 22 that tries to draw the curtain section 4 into the water. As a result of the curving of the curtain part 4, the water flow curved to the side and guided to the river bottom by the curving of the curtain part 4, the polluted water with high pollution flows down the river bottom and effectively prevents the diffusion of the polluted water. It is done.

  At the installation site, no special tools are required, the combination can be easily combined, and in response to the situation where the water volume increases, the water flow is skillfully used so that it does not automatically break. It exhibits self-maintenance, is convenient for transportation regardless of mountainous areas, and is also useful from a management standpoint.

It is a longitudinal cross-sectional view of the pollution diffusion prevention film which concerns on embodiment of this invention. It is a partial front view of a pollution diffusion prevention film. (A), (b) is the partial front view and longitudinal cross-sectional view of a main float part. (A), (b) is the partial front view and longitudinal cross-sectional view of the skirt part which have a subfloat. (A), (b) is a partial front view and longitudinal cross-sectional view of the curtain part which has an underwater float. It is the longitudinal cross-sectional schematic of the pollution diffusion prevention film for demonstrating the operation | movement point in an installation state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main float part 2 Skirt part 3 Sub float 4 Curtain part 5 Underwater float 6 Cylindrical float 7 Float cover 8 Tension belt 9 Reinforcement belt 10 Connection metal fitting 11 Connection metal fitting 12 Float cover 13 Tension belt 14 Skirt 15 Rope weight 16 Reinforcement Belt 17 Connection bracket 18 Connection bracket 19 Curtain 20 Curtain upper side tension belt 21 Curtain lower side tension belt 22 Chain weight 23 Lifting tool 24 Reinforcement belt 25 Connection bracket 26 Connection bracket 27 Connection cable

Claims (3)

  A main float part, a skirt part with a sub float, and a curtain part with an underwater float are provided, and the lower part of the main float and the upper end part of the curtain part are connected with a plurality of connecting ropes to correspond to the gap. A pollution diffusion preventing film characterized in that the lower end portion of the skirt portion is movably coupled to the connecting rope via a coupling fitting.   2. The pollution diffusion preventing film according to claim 1, wherein a rope-like weight is attached to the lower side of the skirt portion, and a chain-like weight is attached to the lower side of the curtain portion. The buoyancy of the sub-float is set to be larger than the weight of the rope-like weight attached to the lower side of the skirt portion, and the buoyancy of the underwater float is set to be smaller than the weight of the chain-like weight attached to the lower side of the curtain portion. The pollution diffusion prevention film as described.

Images