JP4444873B2 - Water shielding film type selective water intake equipment - Google Patents

Description

  The present invention relates to a water-impervious film type selective intake facility that can arbitrarily select an intake water depth.

  In general, the summer water temperature stratification of the dam lake is a surface water layer with a high water temperature (surface layer to about 3 to 10 m depth), a water temperature jump layer (about 5 to 25 m depth) where the water temperature changes abruptly, and a low water temperature. Divided into deep water.

  When water for irrigation is taken, it is necessary to take water from the surface water layer with a high water temperature and discharge it in order to secure a water temperature (about 30 °) suitable for the growth of agricultural products.

  In addition, when muddy water containing fine clay silt (feldspar, paraffin, etc.) flows into the dam lake due to heavy rain or flood, the muddy water stays in the hot water layer over a long period of time, and the silt gradually goes deeper into the bottom of the lake. Therefore, turbid water may be discharged several weeks to several months after heavy rain and flooding, so it is necessary to take water from a clear surface water and discharge it.

  Furthermore, recently, in order to preserve water quality, it has become necessary to take in and discharge the water at the same water temperature level as the river upstream of the dam lake. In this case, the water is taken from the hot water layer or directly below it. There is a need.

  Therefore, when using the conventional selective intake facilities, the intake depths of the dam dam are formed in multiple stages, and the intake depth is selected by opening and closing the gate of each intake, or the bottom or A cylinder that can be moved up and down by a telescope fixed to a dam or a semi-cylindrical gate has been proposed to take water from a necessary water intake depth.

  However, since the water level of the dam lake always fluctuates, there is a problem that there are many complicated operations to automatically follow the change, effectively draw water from the surface layer, the hot water striking layer, or directly below it and discharge it. . Furthermore, the installation of new selective water intake facilities in existing dams is not only accompanied by significant changes in civil engineering, but also the problem that construction is difficult because it is necessary to temporarily stop discharge and sometimes dry the dam lake. There is.

  In order to solve this problem, the present inventors can automatically follow water level fluctuations and take water effectively, and can reduce construction with civil engineering structures to a minimum and simplify construction. A (float type) selective water intake facility was proposed (see Patent Document 1).

  This impermeable membrane type selective intake facility is provided with a float that moves up and down depending on the water level with respect to the intake formed in the dam, and an underwater float that can be moved up and down by an elevator attached to this float. The underwater float is provided with a water shielding film that can shield the periphery and the lower side of the water intake.

  Then, when the underwater float is raised and lowered by a float elevator that moves up and down according to the water level, the water shielding film provided on the underwater float shields the periphery and the lower side of the water intake, and the water floats on the upper side of the water shielding film. It flows into the water-impervious film only from the gap between them and water is taken from the water intake. Therefore, for example, if the underwater float is lifted and lowered with an elevator so that the gap between the upper side of the water shielding film and the float is located in the surface water layer, only the surface water layer can be taken from the water inlet. In addition, if the upper side of the water shielding film is positioned in the water temperature jump layer, the surface water layer and the water temperature jump layer can be taken simultaneously from the water intake, and if the upper side of the water shielding film is positioned in the deep water layer ( In other words, it is possible to obtain an operational effect that water can be taken from all layers above the water shielding film.

  For such a water barrier film type selective water intake facility, it is necessary to reach the bottom of the dam lake so that the water leaks from the gap between the film bottom of the water barrier film and the sediment. A horizontal impervious member (waterstop) that horizontally partitions the inside of multiple water-impervious membranes that are fixed at the upper end of the submerged float and overlapped with the lower submerged float. A water shielding film type selective water intake facility has been proposed in which a fixed support member that supports a lowered submerged float is fixed to a dam below the horizontal water shielding member.

  And it is explained that it is not necessary to reach the bottom of the dam lake because the inside lower part of the water shielding curtain is shielded by a horizontal water shielding member and does not leak.

Further, it is described that the space between the horizontal water-impervious member and the vertical water-impervious film is sealed by a flexible water-stop seal attached to the underwater float. Here, although not particularly described, it is considered that the water-impervious film is sealed by being pressed against the vertical water-impervious film of the horizontal impermeable member with water pressure between the underwater floats.
Japanese Patent No. 3518747 JP 2004-3000696 A

  However, in the technique of Patent Document 2, it is considered that the sludge accumulated on the upper surface of the horizontal water shielding member can be discharged from the water outlet by providing the upper surface of the horizontal water shielding member close to the water inlet. In the flow experiment conducted by the present inventors, it became clear that there was no flow velocity in the water intake direction around the horizontal impermeable member away from the water intake, and a slight vortex was generated and retained. Actually, sludge or the like accumulates on the horizontal impermeable member, and the horizontal impermeable member may be damaged by the weight of the sludge or the like.

  In addition, if it becomes impossible to descend the impermeable film due to a malfunction of the elevator or the like, and water stops flowing into the impermeable film from the gap between the upper side of the impermeable film and the float, the water pressure difference inside and outside the impermeable film will be Since it becomes large, there exists a possibility that a water-impervious film and a horizontal water-impervious member may be damaged.

  It should be noted that between the underwater floats, it is considered that the water barrier film is sealed by being pressed against the vertical water barrier film of the horizontal water barrier member with water pressure. In order to prevent the water member from being deformed so as to be pressed against the vertical water-impervious film, water leaks from the gap between the outer surface of the vertical water-impervious film and the inner surface of the water-impervious film. Has been confirmed by.

  The present invention has been made to solve the above-mentioned problems, and prevents sludge and the like from accumulating on the waterstop, so that there is no risk of the waterstop being damaged by the weight of sludge and the like, and a water shielding film in an emergency. It is an object of the present invention to provide a water-insulating film type selective water intake facility that allows water to flow into the water and eliminates the possibility of damage to the water-insulating film and the water stop.

In order to solve the above problems, the present invention is provided with a float that moves up and down according to the water level with respect to a water intake formed in a dam, and an underwater float that can be moved up and down by an elevator attached to the float. The underwater float is provided with a water-impervious film type selective water intake facility provided with a water-impervious film that can shield the periphery of the water intake, and is fixed to the dam below the water intake, A water blocking base capable of stopping water under the intake is provided together with a water blocking film, and an opening that can be opened and closed by a water blocking door is formed in the water blocking base. Water film type selective water intake equipment is provided.

  According to a second aspect of the present invention, it is preferable that the waterstop is inclined downward in a mortar shape around the upper surface, and an opening that can be opened and closed by the waterstop door is formed in the vicinity of the inclined lower portion.

  According to a third aspect of the present invention, the underwater float is provided in multiple upper and lower stages so as to maintain a predetermined vertical distance, and a water shielding film is continuously fixed to the inner surface of each underwater float so that the underwater float is blocked. The water film is preferably foldable in a bellows shape as the underwater float descends.

According to a fourth aspect of the present invention, it is preferable that a packing member elastically contacting the inner surface of the water shielding film is attached to the outer surface of the water stop.

  The water barrier film guide plates located at both ends of the water barrier film are attached to the dam, and both ends of the water barrier film can be pressed against the water barrier film guide plate from the outside. It is preferable that a pressing member is provided.

  According to a sixth aspect of the present invention, it is preferable that a float holding portion capable of holding the lowered underwater float in a laminated state is integrally formed at a lower portion of the water stop.

  As in claim 7, the underwater float is provided in multiple upper and lower stages so as to maintain a predetermined vertical distance, and is fixed so that upper and lower water shielding films overlap each other on the outer surface of each underwater float. It is preferable that the water-impervious film between the floats can overlap with the lowering of the underwater float.

  The water barrier film guide plate located inside the both ends of each of the water barrier films is attached to the dam as in claim 8, and both ends of the water barrier films are connected to the water barrier film guide plates from the outside. It is preferable that a pressing member capable of pressing is provided.

  Preferably, the upper part of the waterstop also serves as a float holding part capable of holding the lowered underwater float in a laminated state.

  According to the present invention, since the opening that can be opened and closed by the water stop door is formed in the water stop base that can stop the water inlet and the lower side of the water intake, the upper surface of the water stop base can be opened by opening the water stop door. Since the sludge accumulated in the water can be quickly discharged from the opening to the outside, there is no possibility that the waterstop is damaged by the weight of the sludge.

  In addition, if it becomes impossible to descend the impermeable film due to a malfunction of the elevator or the like, and water stops flowing into the impermeable film from the gap between the upper side of the impermeable film and the float, the water pressure difference inside and outside the impermeable film will be Since it becomes large, there is a possibility that the water shielding film and the water stop are damaged. If the water stop door is opened in such an emergency, water flows into the water shielding film from the opening, and the water pressure difference between the inside and outside of the water shielding film is reduced. Disappear.

  According to claim 2, sludge accumulated on the upper surface of the waterstop is collected while sliding down by its own weight near the lower surface of the waterstop by tilting the periphery of the upper surface in the shape of a mortar. Furthermore, by forming an opening that can be opened and closed by a water stop door, sludge and the like can be efficiently discharged to the outside.

  According to claim 3, by continuously fixing the water shielding film to the inner surface of the underwater float and folding the water shielding film in a bellows shape, this continuous type of water shielding film structure has an underwater float. Compared with the overlap-type water-impervious structure in which the upper and lower water-impervious films are fixed so as to overlap the outer surface, water leakage from the overlap portion is eliminated, so that the selective water intake efficiency is improved.

According to claim 4, water leakage from the gap between the outer surface of the water blocking table and the inner surface of the water shielding film is achieved by attaching a packing member elastically contacting the inner surface of the water blocking film to the outer surface of the water blocking table. Therefore, the selective water intake efficiency is improved.

  According to claim 5, since both ends of the water barrier film are pressed from the outside by the pressing member to the water barrier film guide plate of the dam, the gap between the both ends of the water barrier film and the water barrier film guide plate Since there is no water leakage, the selective water intake efficiency is improved.

According to the sixth aspect of the present invention, there is provided a continuous type water shielding film structure that continuously fixes the water shielding film to the inner surface of the underwater float, and in particular, the packing member that elastically contacts the inner surface of the water shielding film on the outer surface of the water blocking table. When attached, it is preferable to lower the underwater float to the lower part of the water stop, so that a float holding part is integrally formed at the lower part of the water stop.

  According to the seventh aspect, even in the overlap-type water-blocking film structure, if a water blocking stand having an opening that can be opened and closed by the water blocking door is provided, there is no possibility that the water blocking stand or the water blocking film is damaged.

  According to claim 8, since both ends of the water barrier film are pressed against the water barrier film guide plate of the dam from the outside by the pressing member, from the gap between the both ends of each water barrier film and the water barrier film guide plate Therefore, the water intake efficiency is improved.

  According to the ninth aspect, in the overlap type water-impervious film structure, the lowered water float can be held in a laminated state by the float holding part at the upper part of the water stop, so that it is like a continuous type water-impervious structure. In addition, since it is not necessary to form a float holding part at the lower part of the water stop, the cost is reduced. It is also possible to form a float holding part in the lower part of the water stop and hold the lowered submerged float in a laminated state with this float holding part.

  In this way, if the underwater float is held by the float holding part at the top of the water stop, the water shielding film itself hanging from the water float acts as a packing member and always makes elastic contact with the outer periphery of the water stop. Since the water leakage from the gap between the outer surface of the water stop and the inner surface of the water shielding film is eliminated, the selective water intake efficiency is improved.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

  FIGS. 1-8 is the water-impervious film type selective water intake equipment provided with the continuous type water-impervious film structure of 1st Embodiment.

  The dam dam 1 is provided with a water intake tower 2 (see FIG. 4) having a pentagonal shape in plan view and bulging in the direction of the dam lake (upstream ... outward). And a bar screen (not shown) for preventing dust such as driftwood from entering the intake port 2a is attached to the front surface of the intake tower 2.

  On the dam 1, a pair of guide rails 4 extending in the vertical direction at both side positions of the intake tower 2 are laid (see FIG. 8A).

  A float 5 and underwater floats 6 (A to E) having a pentagonal shape in plan view are arranged in front of the intake tower 2 so as to surround the outer surface of the intake tower 2 with a predetermined gap therebetween. Each of the floats 5 and 6 (A to E) is filled with a buoyancy material (for example, urethane foam) inside an outer shell made of a metal (for example, stainless steel) box. The buoyancy relationship between the float 5 and the underwater float 6 (A to E) will be described later.

  Both ends of each of the floats 5 and 6 (A to E) are opposed to the respective guide rails 4, and as shown in detail in FIG. 6 (A to E) are provided with a guide roller 11 for receiving a forward load by a wave acting on 6 (A to E) on the front surface of the guide rail 4 and a side shoe 12 for receiving a side load on the side surface of the guide rail 4. .

  The guide roller 11 and the side shoe 12 have a function of receiving the respective weights, a function of positioning both ends of the floats 5 and 6 (A to E) with respect to the guide rail 4, and both ends of the guide roller 4. And a function of guiding so as to move up and down smoothly.

  As shown in FIG. 4 (a), the uppermost float 5 is formed with bulged portions 5a having a square shape in plan view at the center and both sides, respectively, and an electric winch ( Elevator) 15 is installed. Electric power is supplied to the winch 15 from above the dam 1 by a cap tire cable (not shown), and the length of the cap tire cable is adjusted by a cap tire reel.

  The underwater floats 6 (A to E) have a 6A underwater float on the uppermost side and a 6E underwater float on the lowermost side, and the underwater floats 6B, 6C, and 6D are arranged between them. As shown in FIG. 2, the floats 6 (A to E) are connected by a chain 23 (A to D) so as to maintain a constant vertical distance.

  On the inner surface of each underwater float 6 (A to E) held at a constant vertical distance by the chain 23 (A to D), a continuous water shielding film made of flexible synthetic rubber or synthetic resin, or cloth. 16 is fixed. The water shielding film 16 does not necessarily need to be a single continuous piece, and the four pieces having the length of the vertical interval are fixed to the inner surface of each underwater float 6 (A to E) so as to be continuous. Anyway.

  A wire rope 22 that hangs down from the winding drum 15a of the winch 15 and two guide ropes 15b from the winding drum 15a through the guide sheaves 15b of the bulging portions 5a on both sides of the float 5. The wire ropes 22 that hang down are connected to the upper part of the uppermost underwater float 6A (see the connection point a in FIG. 4B).

  When the wire ropes 22 are simultaneously wound up by the winch 15, the chains 23 (A to D) are extended and the underwater floats 6 (A to E) are pulled up and held at predetermined water depth positions. (See FIG. 2) When the wire ropes 22 are simultaneously loosened and lowered by the winch 15, the chains 23 (A to D) are loosened and the underwater floats 6 (A to D) overlap on the fixed frame 32 described later. (See FIG. 3).

  When each underwater float 6 (A to E) is held at a predetermined water depth position, the water shielding film 16 is expanded in the vertical direction by each underwater float 6 (A to E) (see FIG. 2). ) When the underwater floats 6 (A to E) are held on the fixed frame 32 so as to overlap each other (in a stacked state), the underwater floats 6 (A to E) are folded in a bellows shape as the underwater floats 6 are lowered (see FIG. (See FIG. 3).

  Here, the buoyancy relationship between the float 5 and the underwater float 6 (A to E) is such that the specific gravity of the underwater float 6 (A to E) plus the water shielding film 16 and the like is set in the vicinity of 1, Each of the underwater floats 6 (A to E) does not have a buoyancy to lift (up) itself, but is set to have a buoyancy that gently sinks (down) due to the weight of the chain 23 (A to D) or the like. The float 5 is set to have a buoyancy that floats on the water surface L and does not sink (lower).

On the other hand, in the dam 1 below the intake port 2a, the outflow shield is formed on the upper surface so that the underside of the intake port 2a can be stopped together with the water barrier film 16 inside the waterproof membrane 16. A waterstop 20 to which a water shielding sheet 21 made of the same material as the membrane 16 is attached is fixed. The water stop 20 is located above the lowermost underwater float 6E at a position where each underwater float 6 (A to E) is pulled up and held at a predetermined water depth position (see FIG. 2). Yes. A packing member 26 that is elastically in contact with the inner surface of the water shielding film 16 is attached to the outer surface of the water stop 20 (see FIG. 6).

  As shown in FIG. 5A and FIG. 7 (schematic drawing), the waterstop 20 is inclined downward in the shape of a mortar around the upper surface made of the water shielding sheet 21. An opening 20a is formed near the inclined lower portion of the water shielding sheet 21, and a water stop door 27 that can be opened and closed by a hinge portion 27a is attached to the opening 20a (see FIG. 6). In addition, in each figure, although the water stop door 27 is drawn in the state which opened the opening 20a in the diagonal position, it is the state normally closed in the horizontal position.

  As shown in FIG. 6, one end portion of a wire rope 28 is connected to the water stop door 27, the wire rope 28 is extended upward through a guide sheave 29, and the other end portion is connected to the dam. 1 is connected to a manual winder 30 installed in the upper part of 1.

  A fixed frame (float holding portion) 32 capable of holding the lowered underwater float 6 (A to E) in a stacked state is integrally formed at a lower portion of the water stop 20.

  As shown in FIG. 8, a water shielding film guide plate 34 located at both ends of the water shielding film 16 is attached to the dam 1 in parallel with the guide rail 4. A plurality of water shielding film guide rollers 35 are provided at appropriate positions.

  Both end portions of the water shielding film 16 are folded inward to form bag-like portions 16a, and wire ropes (pressing members) 36 are respectively inserted into the bag-like portions 16a at both ends. An upper end portion of 36 is fixed to the upper portion of the dam 1, and a lower end portion is fixed to the fixed frame 32. A tension is applied to the wire rope 36 so that the bag-like portion 16a of the water-shielding film 16 is always pressed against the water-shielding film guide plate 34 from the outside. Further, the water shielding film 16 comes into contact with the water shielding film guide roller 35 and is guided. In addition to folding both ends of the water shielding film 16 to form the bag-like portion 16a, tubular bulges (see reference numeral 16c in FIG. 13) are integrally formed at both ends of the water shielding film 16. The wire rope 36 may be inserted through the bulging portion.

  At both ends of each of the submerged floats 6 (A to E), a water shielding film protection that protects both ends of the water shielding film 16 from being sandwiched between the guide rail 4 and the guide roller 11 or the side shoe 12. A plate 37 is attached.

  A water intake operation method of the water shield film continuous type water intake film type selective water intake facility of the first embodiment configured as described above will be described.

  During normal operation or during periods of heavy rain and flooding, the wire rope 22 is loosened and lowered by the winch 15 so that the chain 23 (A to D) is loosened, and the water-impervious film 16 is formed as each underwater float 6 descends. The underwater float 6 (A to E) is overlapped and held on the fixed frame 32 while being folded in a bellows shape (see FIG. 3). Therefore, since the water-impervious film 16 is lowered to the uppermost underwater float 6A and located in the deep water layer, water can be taken from all layers above the water-impervious film 16.

  On the other hand, when the irrigation water is taken or during operation immediately after heavy rain / flood, the wire rope 22 is wound up by the winch 15 (see FIG. 2), and the uppermost underwater float 6A is first pulled up by the wire rope 22. Then, the next underwater float 6B is pulled up through the chain 23A, and similarly, the underwater float 6 (C, D) is sequentially pulled up through the chain 23 (B, C) to obtain a predetermined water depth. Will be held in position.

  At this time, the water stop 20 and the packing member 26 inside the water shielding film 16 stop the water under the water intake 2 a of the water intake tower 2 together with the water shielding film 16. Further, both end portions of the water shielding film 16 are stopped by pressing the bag-shaped portion 16 a against the water shielding film guide plate 34 from the outside by the tension of the wire rope 36. Therefore, the water stop 20 and the water barrier film 16 stop water on the lower side and both sides of the water intake port 2a, and a gap 39 between the upper side of the water barrier film 16 and the lower side of the float 5 is represented. Since it is located in the water layer, only the surface water layer flows into the water shielding film 16 from the gap 39, and water can be taken from the water intake 2a.

  In this way, the float 5 moves up and down following the water level, and the gap 39 between the upper side of the impermeable membrane 16 and the lower side of the float 5 is always located in the surface water layer. Only the high surface water layer can be accurately taken and discharged, and only the surface water layer that has become clear after heavy rain and flooding can be accurately taken and discharged. In addition, if the upper side of the water-impervious film 16 is positioned in the water temperature jump layer, it flows into the water shield film 16 from the surface water layer and the water temperature jump layer, and the surface water layer and the water temperature jump layer simultaneously from the water intake 2a. Can take water. In FIG. 3, the float 5 descends to the vicinity of the deep water layer, the water shielding film 16 is folded into a bellows shape, and the underwater floats 6 (A to E) are held on the fixed frame 32 so as to overlap each other. Indicates the state.

  Basically, it is only necessary to provide the float 5 with the winch 15 attached and the underwater float 6 (AE) having the water shielding film 16, so that the structure is simple and the cost is low. Since it can be retrofitted to one intake port 2a, the installation cost can be reduced.

  In particular, although the water level of the dam lake always fluctuates, the float 5 can automatically follow the change and can effectively take water from the surface layer and discharge it.

  On the other hand, since the opening 20a that can be opened and closed by the water stop door 27 is formed in the water stop base 20 that can stop the water under the intake port 2a together with the water shielding film 16, if the water stop door 27 is opened, the water stop base Since the sludge accumulated on the upper surface of 20 can be quickly discharged to the outside from the opening 20a, there is no possibility that the waterstop 20 is damaged by the weight of the sludge.

  Further, if the water impervious film 16 cannot be lowered due to a failure of the electric winch 15 or the like, and water does not flow into the water impervious film 16 from the gap 39 between the upper side of the water impermeable film 16 and the float 5, Since the water pressure difference between the inside and outside of the membrane 16 becomes large, the water shielding membrane 16 and the waterstop 20 may be damaged. In such an emergency, the manual winder 30 is operated to open the waterstop door 27. For example, since water flows into the water shielding film 16 from the opening 20a, the water pressure difference between the inside and the outside of the water shielding film 16 is reduced, so that there is no possibility that the water shielding film 16 and the water blocking table 20 are damaged.

  Further, by tilting the periphery of the upper surface of the water stop 20 in a mortar shape, sludge accumulated on the upper surface of the water stop 20 is collected while sliding down near its lower part by its own weight. By forming the opening 20a that can be opened and closed by the water door 27, sludge and the like can be efficiently discharged to the outside.

  In addition, by continuously fixing the water shielding film 16 to the inner surface of the underwater float 6 (A to E) and folding the water shielding film 16 in a bellows shape, this continuous type water shielding structure is: Compared with the overlap type water barrier film structure (see FIG. 10) which is fixed so that the upper and lower water barrier films 16 (A to E) overlap the outer surface of the underwater float 6 (A to E). Since there is no water leakage from the part, the selective water intake efficiency is improved.

Further, by attaching a packing member 26 that elastically contacts the inner surface of the water shielding film 16 to the outer surface of the water blocking table 20, water leakage from the gap between the outer surface of the water blocking table 20 and the inner surface of the water shielding film 16 is achieved. Therefore, the selective water intake efficiency is improved.

  Moreover, since the bag-like part 16a of the both ends of the water barrier film 16 is pressed from the outside to the water barrier film guide plate 34 of the dam 1 by the wire rope 36, both ends of the water barrier film 16 and the water barrier film guide plate 34 Since there is no water leakage from the gap between the two, the selective water intake efficiency is improved.

Furthermore, the Saegimizumaku 16 on the inner surface of the water float 6 (A-E) in water-impervious structure of a continuous type continuously secured, in particular to the outer surface of the water stop base 20, elastically contacts the inner surface of Saegimizumaku 16 When the packing member 26 is attached, it is preferable to lower the underwater float 6 (A to E) to the lower part of the water stop 20, so that the fixed frame 32 is formed integrally with the lower part of the water stop 20. Yes.

  FIGS. 9-14 is the water-shielding film type selective water intake equipment provided with the overlap type water-shielding film structure of 2nd Embodiment. In addition, the same number is attached | subjected to the location of the same structure and an effect | action as the water-impervious film type selection water intake equipment provided with the continuous type water-impervious film structure of 1st Embodiment, and detailed description is abbreviate | omitted.

  For each of the underwater floats 6 (A to E), instead of the continuous water shielding film 16 described above, the water shielding films 16 (A to E) slightly longer than the vertical interval of each of the underwater floats 6 (A to E). ) Is fixed.

  When the wire rope 22 is wound up by the winch 15 (see FIG. 10), the chains 23 (A to D) are extended and the underwater floats 6 (A to E) are pulled up to a predetermined depth position and held. And each said water-impervious film 16 (AE) is suspended from each underwater float 6 (AE), and the water-impervious film whose lower end of the water-impervious film 16 on the upper side is on the lower side It overlaps with the upper end of 16 from the outside, and comes to shield the gap.

  Further, when the wire rope 22 is loosened and lowered by the winch 15 (see FIG. 12A), the chain 23 (A to D) is loosened, and the respective underwater floats 6 (A to D) are placed above the water stop 20. Are overlapped (in a stacked state) and the respective water shielding films 16 (A to E) are overlapped in the thickness direction. In addition, the water-impervious film 16E of the lowermost underwater float 6E always comes into elastic contact with the outer surface of the waterstop 20 as shown in FIG.

  Weights 41 are attached to the lower ends of the respective water shielding films 16 (A to E) in order to prevent the respective water shielding films 16 (A to E) from being swollen by water flow.

  As shown in detail in FIGS. 13 and 14, brackets 42 extending from the respective underwater floats 6 (A to E) in the direction of the dam 1 are provided at upper portions of both end portions of each of the underwater floats 6 (A to E). Are fixed, and each of the water shielding films 16 (A to E) extends in the direction of the dam 1 along the inner surface of the bracket 42 in a state of being detoured from the notch 16b to the inner surface side of the bracket 42. The extended portions of the respective water shielding films 16 (A to E) are fixed to the inner surface of the bracket 42 in a watertight manner.

  Tubular bulges 16c are integrally formed at both ends of each of the water shielding films 16 (A to E), and the respective bulges 16c do not overlap in the front-rear direction but are displaced in the width direction. The lengths of both ends of the water film 16 (A to E) are set.

  Then, for each of the water shielding films 16 (A to E), a wire rope (pressing member) 43 having an upper end connected to the tip of the bracket 42 is inserted into the bulging portion 16 c, and the lower end of the wire rope 43 is inserted. A weight 44 is connected to the part. The wire rope 43 is tensioned by the weight 44 so that the bulging portion 16c of the water-impervious film 16 is always pressed against and contacts the water-impervious film guide plate 34 from the outside. Further, a packing member 45 that contacts the inner surface of the water shielding film 16 (A to E) is attached to the water shielding film guide plate 34.

  The water intake operation method of the water shielding film type selective water intake equipment provided with the overlap type water shielding film structure of the second embodiment configured as described above will be described.

  During normal operation or during periods of heavy rain and flooding, the wire rope 22 is loosened and lowered by the winch 15 so that the chain 23 (A to D) is loosened and each underwater float 6 (A to D) is moved to the water stop 20 It will be in the state where it overlapped with the upper part (in the lamination state) and was held [refer to Drawing 12 (a)]. Therefore, since each water-impervious film 16 (A to D) is lowered and the uppermost underwater float 6 </ b> A is located in the deep water layer, water can be taken from all layers above the water-impervious film 16 (A to D). become.

On the other hand, when the irrigation water is taken in or immediately after heavy rain / flood operation, the wire rope 22 is wound up by the winch 15 (see FIG. 10), and the uppermost underwater float 6A is first pulled up by the wire rope 22. It is gradually, following underwater float 6B through the chain 23A is gradually raised, in the same manner as the chain 23 (B, C) water float 6 (C, D) is lifted sequentially through a predetermined It will be held in the water depth position.

  At this time, the gaps between the respective water shielding films 16 are blocked, and the water intake of the intake tower 2 together with the respective water shielding films 16 (A to E) on the outer surface of the water blocking base 20 inside the lowermost water shielding film 16E. The lower side of the mouth 2a is stopped. Further, both ends of each of the water shielding films 16 (A to E) are stopped by the bulging portion 16 c being pressed from the outside against the water shielding film guide plate 34 by the tension of the wire rope 43. . Therefore, the lower side and both sides of the water intake port 2a are stopped by the water blocking table 20 and the respective water shielding films 16 (A to E), and the upper side of each water shielding film 16 (A to E). Since the gap 39 between the upper surface of the float 5 and the lower side of the float 5 is located in the surface water layer, only the surface water layer flows into the water shielding film 16 from the gap 39 and water can be taken in from the water intake port 2a.

  In this way, the float 5 moves up and down following the water level, and the gap 39 between the upper side of the uppermost water shielding film 16A and the lower side of the float 5 is always located in the surface water layer. Sometimes only the surface water layer with high water temperature can be accurately taken and discharged, and only the surface water layer that has become clear after heavy rain and flooding can be accurately taken and discharged. In addition, when the upper side of the uppermost water-impervious film 16A is positioned in the water temperature jump layer, the water flows from the surface water layer and the water temperature jump layer into the respective water shield films 16 (A to E), and the surface water layer and the water temperature. It becomes possible to draw water from the water intake 2a at the same time.

  Basically, since the float 5 with the winch 15 attached and the underwater float 6 (AE) having the water shielding films 16 (AE) are provided, the structure is simple and the cost is low. In addition, since it can be installed later on the intake port 2a of the existing dam 1, the installation cost can be reduced.

  In particular, although the water level of the dam lake always fluctuates, the float 5 can automatically follow the change and can effectively take water from the surface layer and discharge it.

  On the other hand, since the opening 20a that can be opened and closed by the water stop door 27 is formed in the water stop base 20 that can stop the lower side of the water intake port 2a together with the respective water barrier films 16 (A to E), If it opens, the sludge etc. which accumulated on the upper surface of the water stop 20 can be quickly discharged | emitted from the opening 20a to the exterior, Therefore There is no possibility that the water stop 20 will be damaged by the weight of sludge etc.

  Further, the water impervious film 16 (A to E) cannot be lowered due to a failure of the electric winch 15 or the like, and the water impervious film from the gap 39 between the upper side of the water impervious film 16 (A to E) and the float 5. If the water does not flow into 16 (A to E), the water pressure difference between the inside and outside of the water shielding film 16 (A to E) becomes large, so that the water shielding film 16 (A to E) and the water stop 20 may be damaged. However, if the manual winder 30 is operated to open the water stop door 27 in such an emergency, water flows into the water shielding film 16 (A to E) from the opening 20a. Since the water pressure difference between the inside and outside of 16 becomes small, there is no possibility that the water shielding film 16 (A to E) and the water stop 20 are damaged.

  Further, by tilting the periphery of the upper surface of the water stop 20 in a mortar shape, sludge accumulated on the upper surface of the water stop 20 is collected while sliding down near its lower part by its own weight. By forming the opening 20a that can be opened and closed by the water door 27, sludge and the like can be efficiently discharged to the outside.

  Moreover, since the bulging part 16c of each water-shielding film 16 (AE) is pressed on the water-shielding film guide plate 34 of the dam 1 from the outside with the wire rope 43, each water-shielding film 16 (AE) As a result, water leakage from the gap between the two ends and the water shielding film guide plate 34 is eliminated, so that the selective water intake efficiency is improved.

  Furthermore, in the overlap type water-impervious film structure of the second embodiment, the lowered underwater float 6 (A to E) can be held in a stacked state at the upper part (float holding part) of the water stop 20. Since it is not necessary to form the fixed frame (float holding part) 32 in the lower part of the water stop 20 as in the continuous type water-impervious structure of the first embodiment, the cost is reduced. It is also possible to form a fixed frame (float holding part) 32 at the lower part of the water stop 20 and hold the lowered underwater float 6 (A to E) in a laminated state by the fixed frame 32.

  Thus, if the underwater float 6 (AE) is hold | maintained at the upper part of the water stop stand 20, the water-impervious film 16 (E) itself which hung down from the lowest underwater float 6 (E) acts as a packing member. In addition, by always making elastic contact with the outer surface of the water stop 20, water leakage from the gap between the outer surface of the water stop 20 and the inner surface of the water shielding film 16 (E) is eliminated. To improve.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of a water shielding film type selective water intake facility provided with a continuous type water shielding film structure of a first embodiment. It is a side view of FIG. It is a side view of the water-impervious selective water intake equipment when the water-impervious film is at the lowest level. (A) is a top view of a float, (b) is a top view of an underwater float. (A) is a top view of a water stop, (b) is a top view of a fixed frame. It is a side view of the water stop door of a water stop and its opening-and-closing mechanism. It is a schematic perspective view of a water stop. (A) is a plane sectional view of a water stop structure of both ends of a water barrier film, and (b) is an important section enlarged view of (a). It is a front view of the water shielding film type selective water intake equipment provided with the overlap type water shielding film structure of a 2nd embodiment. FIG. 10 is a side view of FIG. 9. It is a top view of a water stop. (A) is a side view of the vicinity of the water stop when the water barrier film is at the lowest position, and (b) is a side view of the vicinity of the water stop when the water barrier film is at the highest position. (A) is a plane sectional view of the water stop structure of the both ends of a water barrier film, (b) is a plane sectional view showing the overlap state of a water barrier film. It is a rear view equivalent to the AA line of Fig.13 (a).

Explanation of symbols

1 Weir 2a Water intake 4 Guide rail 5 Float 6 (AE) Underwater float 15 Winch (elevator)
16 (A to E) Water-impervious film 20 Waterstop 20a Opening 21 Water-impervious sheet 26 Packing member 32 Fixed frame (float holding part)
36 Wire rope (pressing member)
39 Clearance 42 Bracket 43 Wire rope (pressing member)

Claims (9)

A float that moves up and down according to the water level is provided for the intake formed in the dam, and an underwater float that can be raised and lowered by an elevator attached to the float is provided. The underwater float is shielded from the periphery of the intake. In the water-impervious film type selective water intake equipment provided with a water-impervious water barrier film,
A waterstop is secured to the dam below the water intake, and a water stop is provided inside the water shielding film and can stop the lower side of the water intake with the water barrier. A water-impervious film type selective water intake facility characterized in that an opening that can be opened and closed by a water door is formed.   The waterstop according to claim 1, wherein the waterstop is inclined downwardly in a mortar shape around the upper surface, and an opening that can be opened and closed by the waterstop door is formed in the vicinity of the lower portion of the inclined surface. Membrane type selective water intake equipment.   The underwater float is provided in multiple upper and lower stages so as to maintain a predetermined vertical distance, and a water shielding film is continuously fixed to the inner surface of each underwater float. The water-impervious film type selective water intake equipment according to claim 1, wherein the water-impervious film type selective water intake equipment can be folded in a bellows shape as it descends. 4. The water shielding film type selective water intake equipment according to claim 3, wherein a packing member elastically contacting the inner surface of the water shielding film is attached to the outer surface of the water stop.   The dam is provided with a water shielding film guide plate located inside both ends of the water shielding film, and provided with a pressing member capable of pressing both ends of the water shielding film from the outside to the water shielding film guide plate. The water-impervious film type selective water intake equipment according to claim 3 or 4, wherein   The water shielding unit according to any one of claims 3 to 5, wherein a float holding portion capable of holding the lowered underwater float in a stacked state is integrally formed at a lower portion of the water stop. Membrane type selective water intake equipment.   The underwater float is provided in multiple upper and lower stages so as to maintain a predetermined vertical interval, and is fixed so that the upper and lower water shielding films overlap with the outer surface of each underwater float. The water-impervious film type selective water intake equipment according to claim 1 or 2, wherein the water-impervious film type selective water intake equipment can be overlapped as the underwater float descends.   The dam is provided with a pressing member capable of pressing both ends of each of the water shielding films from the outside to the water shielding film guide plates. The water-impervious film type selective water intake equipment according to claim 7, wherein   The water-blocking film type selective water intake system according to claim 7 or 8, wherein the upper part of the water stop serves also as a float holding part capable of holding the lowered underwater float in a laminated state.

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