JP2016037757A - Temporary coffering facility for repairing flood spillway gate of dam body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a temporary coffering facility for repairing a flood spillway gate of a dam body that satisfactorily performs damming-up function at a time of normal water level, conducts water safely and securely at a time of flood, and offers high workability and economic efficiency.SOLUTION: A temporary coffering facility 25 is for reforming a flood spillway gate of a dam body 30. A damming-up mechanism comprises a rotatable door body 5 supported by a flexible hinge sheet 7 on a top surface of a foundation base 38, and flexible bag bodies 12 (A,B) installed on a downstream side of the door body 5. A flap gate 3 is configured such that when the bag bodies 12 (A,B) expand, a top part of the door body 5 is rotated to an erected position U at a height almost equivalent to a top part of a flood spillway gate 31, and when the bag bodies 12 (A,B) contract, a front surface of the door body 5 is rotated to a falling position D at a height almost equivalent to a bottom part of the flood spillway gate 31.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a temporary deadline facility for repairing a spillway gate of a dam body.

  Conventionally, a door body supported at the bottom of the water channel and rotatable between an upstream standing position and a downstream lying position, and a plurality of bag bodies installed on the downstream side of the door body. The undulation that is provided and the door body is rotated to the upright position by the expansion of each bag body by the supply of fluid, and the door body is rotated to the lying position by the contraction of each bag body by the discharge of fluid. There is a gate (see Patent Document 1).

  On the other hand, FIG. 11 (a) is a front view of the dam body 30 of the flood control / water use reservoir dam as seen from the upstream side, and FIG. 11 (b) is a central sectional view of FIG. 11 (a). 30 is provided with a plurality of (eight in this example) spillway gates (for example, a liftable roller gate) 31. This spillway gate 31 is provided to maintain the water level for hydropower intake, but it opens at the time of flooding when the water level rises rapidly, and discharges river water to the downstream side. It is also used to prevent flood disasters upstream of the body 30.

  By the way, in recent years, the redevelopment of flood control and water use dams to prevent flood disasters has been attracting attention. Here, “dam redevelopment” is to make more effective use of existing dams by renovating them rather than establishing new ones.

  For example, the sand discharge of a dam whose original water control function (planned discharge of flood flow, etc.) is impaired due to the drastic reduction of water storage capacity due to the progress of sedimentation (see arrow b in FIG. 11 (b)). It is modified to improve its functions.

  For this purpose, as shown in FIG. 12A, among the existing spillway gates 31, for example, the middle four spillway gates 31 are removed, and instead, two units extending deeply toward the bottom of the dam lake. The spillway gate 32 is newly established.

  As a result, even if sedimentation proceeds as shown by the arrow b in FIG. 12B, the sand discharge function can be improved by opening the new spillway gate 32 as shown in FIG. 12C. Yes (see arrow c).

  Here, in order to repair the existing dam, as shown in FIG. 13A, it is necessary to construct a temporary deadline facility 35 for repairing the spillway gate on the upstream side of the dam body 30.

  In other words, among the plurality of spillway gates 31 of the dam body 30, the upper part of the spillway gate 31 is located on both the left and right sides on the upstream side of the part of the spillway gate 31 to be repaired (four in the middle in this example). A side water-stop sheet pile 36 having a height substantially corresponding to is driven into the bottom of the water. Further, a front and rear water stop sheet pile 37 having a height substantially corresponding to the lower part of the spill gate 31 is driven into the bottom of the water between the side water stop sheet piles 36. A foundation base 38 is installed inside the front and rear water stop sheet piles 37, and a weir mechanism 39 (A to C) having a height substantially corresponding to the upper part of the spillway gate 31 is installed on the foundation base 38. To do.

  As a result, a water stop space S is formed on the upstream side of the spillway gate 31 to be repaired on the dam body 30 so that the existing spillway gate 31 can be removed and a new spillway gate 32 can be constructed. Renovation work can be performed smoothly. During flooding during this renovation work (usually 3 to 5 years), river water can be discharged downstream with the two existing spillway gates 31 left and right (see arrow a).

  By the way, the damming mechanism 39 (A) in FIG. 13 (b) is a large sandbag type, the damming mechanism 39 (B) in FIG. 13 (c) is a soil dam type, and the damming mechanism in FIG. 13 (d). The mechanism 39 (C) is a flash board type.

JP 59-65114 A

  However, at the time of a commutation from a hydroelectric power generation channel and a flood that cannot be discharged only by the two existing spillway gates 31 left and right, a fixed large sandbag type and earth dam type damming mechanism 39 Both (A) and 39 (B) have a problem that they cannot prevent a flood disaster on the upstream side of the dam body 30 because they do not have a water flow function.

  Further, the flash board type damming mechanism 39 (C) only stands the boat 40 made of wood or steel plate against the stay 41. When the stay 41 cannot be supported by the water pressure due to the flood, the board 40 is Although it is intended to prevent flooding by allowing it to flow away, it has to be re-installed every time it is lost, so there is a problem that workability and economy are poor.

  The present invention has been made to solve the above-mentioned problems, reliably exerting a damming function when the amount of water is normal, and exhibiting a function of allowing water to flow safely and reliably during floods, and has excellent workability and economic efficiency. The purpose is to provide a temporary deadline facility for repairing the spillway gate of the dam body.

  In order to solve the above-mentioned problems, the present invention provides a plurality of spillway gates on the upstream side of the dam dam body, which are substantially arranged on the left and right sides of a part of the spillway gates to be repaired, above the spillway gates. The steel pipe sheet pile for the side water stop of the corresponding height is driven into the bottom of the water, and the front and rear part water stop of the height substantially equivalent to the lower part of the spill gate is formed in the front and back part between the steel pipe sheet piles for the side water stop. A steel pipe sheet pile is driven into the bottom of the water, and a foundation is installed inside the front and rear water-stop steel pipe sheet pile, and a weir stop mechanism having a height substantially equivalent to the upper part of the spillway gate is installed on the foundation. A temporary closing facility for repairing a spillway gate of a dam body, wherein the damming mechanism is supported by a flexible hinge sheet on the upper surface of the foundation platform, Rotates between the upright standing position and the downstream lying position between door-to-door piers And a flexible bag body installed on the downstream side of the door body. The expansion of the bag body by the supply of fluid causes the upper part of the door body to be substantially above the spillway gate. It is turned to the standing position of the corresponding height, and the front part of the door body is turned to the lying position substantially equivalent to the lower part of the spillway gate due to the shrinkage of the bag body due to the discharge of fluid. The provisional deadline facility for repairing the spillway gate of the dam body is provided.

  The bag body, the protective sheet, and the hinge sheet are made of a rubberized cloth of the same material and the same thickness, and the bag body is housed and protected in a protective sheet that is curved in a substantially U shape when viewed from the side. The front end portions of the sheets are stacked one on top of the other and bonded to each other, and a lower metal fitting having a concave or convex portion in the width direction is provided on the upper surface of the foundation base. An upper metal fitting having convex or concave portions in the width direction facing each other is provided, and the front end portion of the protective sheet is bolted from above to the lower metal fitting through the bolt hole of the front end portion of the protective sheet, While being bent between the concavo-convex portions and being detachably fixed to the upper surface of the base near the pivotal fulcrum of the door body, the protective sheet for storing and protecting the bag body is the door body Fixed to the back and top of the base It can be a non configuration.

  A plurality of the bag bodies are provided in the vertical direction, and each bag body is housed and protected in each protective sheet, and the tip portions of the protective sheets are overlapped with each other and bonded together. It can be set as the structure separated.

  According to the present invention, the undulating gate is adopted as the damming mechanism. This undulating gate is supported by a flexible hinge sheet on the upper surface of the base, and can be rotated between an upstream standing position and a downstream lying position (for example, made of metal). It is composed of a combination (hybrid) with a flexible bag (for example, made of rubberized cloth). Then, due to the expansion of the bag body due to the supply of fluid, the upper part of the door body is rotated to a standing position substantially equivalent to the upper part of the spillway gate, and the front of the door body is contracted by the contraction of the bag body due to the discharge of fluid. The part is rotated to a lodging position having a height substantially corresponding to the lower part of the spillway gate.

  Therefore, at the time of flat water, by raising the undulation gate, river water does not flow into the water stop space in the side and front and rear water stop sheet piles, so that the renovation work can be performed smoothly. In addition, river water is always commutated by taking water from a power intake facility located upstream of the water stop space.

  At the time of flooding during renovation work, river water can be discharged downstream from the existing spillway gate left without renovation work at the initial stage of flooding.

  When the flood flow further increases and the existing spillway gate is not enough to discharge the water, the undulation gate is overlaid. As a result, the river water flows into the water stop space, and the river water can be discharged downstream from the spillway gate during the repair work. In addition, it is possible to finely adjust the discharge amount of river water by tilting up and down while adjusting the standing angle without completely tilting up and down the gate.

  Thus, by adopting the undulating gate as the damming mechanism, the damming function can be surely exhibited when the amount of water is normal. Also, in the event of a flood, unlike the fixed large sandbag type or earth dam type, it is possible to demonstrate the function of allowing water to flow safely and reliably just by overturning the undulation gate. A disaster can be prevented.

  In addition, unlike the flash board type, there is no need to re-install each time it is lost, and it can be used repeatedly, resulting in excellent workability and economy.

  In addition, since the foundation is to be removed together with the steel pipe sheet pile after the renovation work is completed, it is usually made simply by using the debris accumulated in the dam lake, and may be distorted by water pressure. To eliminate the distortion, construction costs of several hundred million yen are required. Therefore, the door body of the undulating gate is supported on the upper surface of the foundation table by a flexible hinge sheet, and the flexible bag body is installed between the upper surface of the foundation table and the back surface of the door body. Even if the base is distorted, the distortion can be absorbed by the flexible hinge sheet and the flexible bag. Therefore, the foundation base on which the undulation gate is installed may be a simple one using only the debris accumulated in the dam lake, so that construction cost for eliminating the distortion of the foundation base becomes unnecessary.

  On the other hand, the bag body, the protective sheet and the hinge sheet are made of the same material and the same thickness as the rubberized cloth, and the bag body is housed and protected in a protective sheet that is curved in a substantially U shape, and the tip portions of the protective sheet are If they are stacked one on top of the other and bonded to each other, the bags are protected by being housed in protective sheets that are curved in a substantially U shape in side view, and the bags are protected. Since it is not necessary to hold the entire surface by adhering to the sheet, even if a part of the sheet is adhered, there is a possibility that the bag body may peel off from the protective sheet and drop off when its adhesiveness has deteriorated due to aging. Disappear.

  In addition, since the downstream portion of the bag body is covered and protected by a protective sheet, there is less risk of damage even if a driftwood or the like hits the water.

  Furthermore, the protective sheet is secured to the top surface of the foundation by detachably fixing the tip of the protective sheet to the lower bracket by bolting the upper bracket to the lower bracket. The tip portion of is firmly fixed to the upper surface of the base.

  Moreover, since the tip portions of the protective sheet are stacked one on top of the other and bonded together, the strength of the bolt hole at the tip portion of the protective sheet is improved, and the bolt hole is extended and broken. Can be prevented in advance. Thus, the strength of the bolt hole at the tip portion of the protective sheet can be improved.

  Furthermore, a plurality of bags are provided in the vertical direction, and each bag is housed and protected in each protective sheet, and the tip portions of each protective sheet are stacked one on top of the other and bonded together. If it is set as the structure to form, it can apply also to the multiple bag type which has a bag body and a protection sheet other than one set of a single bag type of a bag body and a protection sheet.

It is a top view of the temporary deadline facility for spillway gate repair of the dam dam body concerning embodiment of this invention. FIG. 2 is an enlarged cross-sectional view taken along a line II in FIG. 1. It is a perspective view of the standing position of the hoisting gate provided with the bag body of a multiple bag type. It is a perspective view of the fall position of the undulation gate of FIG. (A) is a rear view of the left half of the undulating gate of FIG. 3 and a front view of the right half, and (b) is a side view of the undulating gate of FIG. It is a side view of the bag body and protective sheet of FIG. (A) is a disassembled perspective view of an upper metal fitting and a lower metal fitting, (b) is a perspective view of the front-end | tip part of the protection sheet of FIG. FIG. 4 is a schematic side sectional view of a bag supply / exhaust port of FIG. 3. (A) (b) is a schematic-drawing sectional drawing of the reinforcement member of the supply / exhaust port of the bag body of FIG. 3, respectively. It is a side view of the standing position of the hoisting gate provided with the single bag type bag. (A) is the front view which looked at the dam body of a flood control / damage storage dam from the upstream side, (b) is a center sectional view. The front view which looked at the dam body after a repair from the upstream side, (b) is the center sectional view which closed the new spillway gate, (c) is the central sectional view which opened the new spillway gate. (A) is a plan view of a conventional dam dam body spillway gate temporary closing facility, (b) is a large sandbag type damming mechanism (a) II-II line enlarged cross-sectional view, (c) is (A) II-II expanded sectional view of the earth dam type damming mechanism, (d) is the II-II expanded sectional view of (a) of the flash board type damming mechanism.

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. Note that portions having the same configuration and operation as those of the background art are denoted by the same reference numerals, and detailed description thereof is omitted.

  FIG. 1 is a plan view of a temporary closing facility 25 for repairing a spillway gate of a dam body 30, and FIG. 2 is an enlarged cross-sectional view taken along a line II in FIG. 1.

  Of the plurality (eight in this example) of spillway gates (roller gates) 31 on the upstream side of the dam body 30, a spillway gate 31 (this book) including a part to be repaired (four in the middle in this example) In the example, the steel pipe sheet piles 36 for side water stop having a height substantially corresponding to the upper portion of the spill gate 31 are driven into the bottom of the left and right sides of the middle six). Further, front and rear water-stopping steel sheet piles 37 having a height substantially corresponding to the lower part of the spillway gate 31 are driven into the bottom of the water between the side water-stopping steel pipe sheet piles 36. The bottom of the front and rear water-stopping steel pipe sheet pile 37 is filled with earth and stone 45 accumulated in the dam lake, and a foundation base 38 formed by placing a concrete foundation 46 above the earth and stone 45 is installed.

  On the concrete foundation 46, concrete door-to-door pears 47 that stand upward along the inner surfaces of the left and right side water-stopping steel pipe sheet piles 36 are erected.

  Then, in the pit 46 a of the concrete foundation 46 between the left and right door-contacting piers 47, a weir whose height of the upper part of the door body 5 is substantially equivalent to the upper part of the spillway gate 31 in the standing state U of FIG. 2. The undulation gate 3 which is a mechanism is installed. This undulation gate 3 does not have to be a single unit, and a plurality of units (for example, 2 to 6 units) can be installed side by side in the pit 46a of the concrete foundation 46.

  By the undulation gate 3, a water stop space S is formed on the upstream side of the spillway gate 31 to be repaired of the dam dam body 30.

  In FIG. 1, an arrow d indicates a route through which river water at the time of normal water is taken from a power generation intake facility 26 located upstream of the temporary closing facility 25. An arrow a indicates a route for discharging river water to the downstream side from the two existing left and right spillway gates 31 left without the repair work during the repair work. In addition, the arrow e indicates that the river water flows into the still water space S by overturning the door body 5 of the undulating gate 3, and the existing spillway gate under construction (six in the example) 31 also shows a route for discharging river water downstream.

  3 is a perspective view of an upright position U of the hoisting gate 3 having the multiple bag-type bag bodies 12A and 12B, FIG. 4 is a perspective view of a lying position D of the hoisting gate 3 in FIG. 3, and FIG. 3 is a rear view of the left half of the undulating gate 3 and a front view of the right half of FIG. 3, and FIG. 5B is a side view of the undulating gate 3 of FIG.

  In the pit 46a of the concrete foundation 46 of the foundation base 38, a metal rectangular door body 5 of the undulating gate 3 is arranged.

  A hinge sheet 7 made of a flexible rubberized cloth serving also as a water stop is straddling the lower part of the door body 5 and the upper metal fitting 6a in the pit 46a, and a bolt is attached to the lower part of the door body 5 via a pressing plate 8a. And is fixed to the upper metal fitting 6a in the pit 46a with a bolt via a pressing plate 8b.

  Thereby, the door body 5 comes to be supported by the concrete foundation 46 of the foundation stand 38 so as to be rotatable between the upstream standing position U and the downstream lying position D. In the lying position D, As shown in FIG. 4, it is substantially flush with the concrete foundation 46. Further, the left and right ends of the door body 5 come into contact with the door-contacting pier 47 so that the water is stopped between them.

  A retaining band 22 for restricting the maximum standing position U of the door body 5 is attached to the back surface of the door body 5 and the bottom of the pit 46a.

  A roller 10a is supported by a bracket 10b on the lower inner surface on the downstream side of the door body 5, and the roller 10a abuts against the middle metal fitting 6b in the pit 46a, so that the lower end portion of the door body 5 is formed by the middle metal fitting 6b. Become supported.

  On the downstream side of the door body 5, a plurality of (upper and lower two in this example) bag bodies 12 </ b> A and 12 </ b> B are installed. Each bag 12A, 12B has a width slightly shorter than the lateral width of the door 5 and is formed into a substantially flat hollow pillow shape by a rubberized cloth having a thickness of several millimeters.

  Referring to FIG. 6, each of the bag bodies 12 </ b> A and 12 </ b> B is housed and protected in a single protective sheet 13 </ b> A and 13 </ b> B that is curved in a substantially U shape in a side view. The protective sheets 13A and 13B are preferably made of a flexible rubberized cloth having the same material and thickness as the bag bodies 12A and 12B.

  The tip portions 13a and 13b of the protective sheets 13A and 13B are superposed vertically (overlapping four sheets), and are unified by mutual bonding (apparently one sheet). .) Curved in a U-shape in the downstream direction and detachably fixed to the bottom of the pit 46a of the concrete foundation 46 near the pivot point O (see FIG. 3) of the door body 5.

  Specifically, as shown in FIG. 3 and FIG. 7A, a lower metal fitting 14A having a concave portion 14a in the width direction (which may be a convex portion) 14a is fixed to the lower metal fitting 6c in the pit 46a of the concrete foundation 46. ing. In the present embodiment, the lower metal fitting 14A is integrally formed with the lower metal fitting 6c. Further, an upper metal fitting 14B having an arcuate convex part (or a concave part) 14b in the width direction facing the lower metal fitting 14A is provided. Then, the tip portions 13a and 13b of the protective sheets 13A and 13B, which are stacked one above the other, are threaded from the bolt holes 14c of the upper fitting 14B through the bolt holes 13c of the tip portions 13a and 13b. By tightening with bolts 15 from above, as shown in FIG. 7B, the corrugated portions 14a and 14b are bent into a waveform and sandwiched. Thereby, each front-end | tip part 13a, 13b of protection sheet 13A, 13B comes to be fixed to the bottom part of the pit 46a of the concrete foundation 46 so that attachment or detachment is possible.

  As shown in detail in FIGS. 9 (a) and 9 (b), each bag 12A, 12B is communicated with a fluid (air in this example) supply / exhaust port 16 together with each protective sheet 13A, 13B. The protective sheets 13 </ b> A and 13 </ b> B in the vicinity of 16 are bonded in an airtight manner with an adhesive rubber 17. Further, the bag body 12A and the protective sheet 13A in the vicinity of the supply / exhaust port 16 and the bag body 12B and the protective sheet 13B are also hermetically bonded.

  Further, the bag body 12A and the protective sheet 13A, and the bag body 12B and the protective sheet 13B are bonded at appropriate locations so as not to be displaced. This adhesion does not prevent the bag bodies 12A and 12B from dropping off from the protective sheets 13A and 13B, but only prevents positional displacement. Therefore, it is also possible to prevent positional displacement by attaching small piece sheets in advance to the respective bag bodies 12A, 12B and the respective protective sheets 13A, 13B, and fixing the necessary small piece sheets together by bonding or bolts / nuts or the like. .

  The protective sheets 13A and 13B housing the bags 12A and 12B are not fixed to the back surface of the door body 5 and the bottom of the pit 46a of the concrete foundation 46, that is, in a free state.

  A ring-shaped reinforcing member 18 that reinforces the periphery of the supply / exhaust port 16 is bonded to the inner surface of each bag body 12A, 12B. In the example of FIG. 9A, the entire metal reinforcing plate 18 a is covered with the rubber material 18 b and the rubber material 18 b is bonded to the periphery of the supply / exhaust port 16. In the example of FIG. 9B, a plurality of (two in this example) sheets of rubberized cloth made of the same material as the protective sheets 13A and 13B and the bag bodies 12A and 12B are stacked. It adheres around the outlet 16.

  Returning to FIG. 3, the hollow box 6d in the pit 46a of the concrete foundation 46 is provided with a flexible pipe 20 connected to a terrestrial fluid (for example, air) supply source. The sheet 13B and the bag 12B are connected to the lower supply / discharge port 16 '.

  Therefore, as shown in FIG. 3, the door body 5 is rotated to the standing position U by the expansion of the bag bodies 12A and 12B through the supply / discharge port 16 ′ and the supply / discharge port 16 by the supply of air from the flexible tube 20. Moved. Further, as shown in FIG. 4, by discharging air from the flexible tube 20, the door body 5 is rotated to the lying position D by contraction of the bag bodies 12 </ b> A and 12 </ b> B through the supply / exhaust port 16 ′ and the supply / exhaust port 16. Moved.

  In this case, as shown in FIG. 8, if the diameter D1 of the supply / discharge port 16 between the upper and lower bag bodies 12A, 12B is made larger than the diameter D2 of the supply / discharge port 16 'on the flexible tube 20 side (D1> D2) The air circulation becomes smooth and the upper and lower bag bodies 12A, 12B can be evenly inflated.

  On the other hand, as shown in FIG. 10, when only one bag body 12 is used, the protective sheet 13 is also one, but the tip portion 13a of the protective sheet 13 is attached to the upper metal fitting as in the multiple bag type. 14B and the lower metal fitting 14A are bolted with a bolt 15. Thereby, the front-end | tip part 13a of the protection sheet 13 comes to be fixed in the pit 46a of the concrete foundation 46 so that attachment or detachment is possible.

  In the case of the spillway gate repair temporary closing facility 25 for the dam dam body 30 as described above, the undulating gate 3 is adopted as a damming mechanism. The hoisting gate 3 is supported by a flexible hinge sheet 7 on the upper surface of a concrete foundation 46 that is a part of the foundation stand 38, and is rotated between an upstream standing position U and a downstream lying position D. The movable metal door body 5 and the flexible bag bodies 12A and 12B are combined (hybrid).

  And by expansion | swelling of the bag bodies 12A and 12B by supply of a fluid, the upper part of the door body 5 rotates to the standing position U of the height substantially equivalent to the upper part of the spillway gate 31, and the bag body 12A by discharge | emission of fluid With the contraction of 12B, the front surface portion of the door body 5 is rotated to the fall position D having a height substantially corresponding to the lower portion of the spill gate 31.

  Therefore, when the water is flat, river water does not flow into the water stop space S in the steel pipe sheet piles 36 and 37 by raising the undulation gate 3, so that the existing spill gate 31 is removed and the new spill gate 32 is provided. Renovation work such as construction can be performed smoothly.

  At the time of flooding during the renovation work, river water can be discharged downstream from the existing spillway gates (two on the left and right in FIG. 1) 31 that have been left without renovation work.

  When the flood flow further increases and the water discharge amount is insufficient with the existing spillway gate 31 alone, the undulation gate 3 is laid down. Thereby, river water flows in into the still water space S, and river water can be discharged downstream from the existing spillway gate (six in FIG. 1) 31 under repair work. Note that the discharge flow rate can be finely adjusted by tilting the rising gate 3 while adjusting the standing angle without completely tilting the rising gate 3.

  Thus, by using the undulating gate 3 as a damming mechanism, the damming function can be reliably exhibited when the amount of water is normal. Also, in the event of a flood, unlike the fixed large sandbag type or the soil dam type, the function of allowing water to flow safely and reliably can be exhibited simply by overturning the undulation gate 3, so the upstream side of the dam body 30 Can prevent flood disasters.

  In addition, unlike the flash board type, there is no need to re-install each time it is lost, and it can be used repeatedly, resulting in excellent workability and economy.

  Furthermore, since the foundation 38 is to be removed together with the steel pipe sheet piles 36 and 37 after the renovation work is completed, the foundation 38 is usually simply constructed by using the debris 45 accumulated in the dam lake, and is distorted by water pressure. In order to eliminate this distortion, construction costs of several hundred million yen are required. Therefore, the door body 5 of the undulating gate 3 is supported by the flexible hinge sheet 7 on the bottom of the pit 46 a of the concrete foundation 46, and the flexible bags 12 A and 12 B are supported by the pit 46 a of the concrete foundation 46. Even if the base 38 is distorted by being installed between the bottom and the back surface of the door body 5, the distortion can be absorbed by the flexible hinge sheet 7 and the flexible bag bodies 12A and 12B. it can. Therefore, the foundation base 38 on which the undulation gate 3 is installed may be a simple one using only the earth and stone 45 accumulated in the dam lake, so that the construction cost for eliminating the distortion of the foundation base 38 becomes unnecessary.

  Further, the undulating gate 3 employed as the damming mechanism of the temporary closing facility 25 for repairing the spillway gate of the dam body 30 has the following advantages compared to the undulating gate used in the water channel as in Patent Document 1. is there.

  (A) Since the allowable deflection of the door body 5 is relaxed from 1/800 to 1/600, the plate thickness and reinforcement of the door body 5 can be reduced, so that the economy is improved.

  (B) Since the door body 5 and the bag bodies 12A and 12B can be subdivided in the width direction of the dam dam body 30 (a plurality of undulating gates 3 are arranged side by side), flexibility as the undulating gate 3 is improved. Then, the allowable amount of distortion of the base table 38 is expanded from several mm to several cm.

  (C) It is not necessary to use a corrosion-resistant material for the door body 5.

  (D) Since it is used for a short period (3 to 5 years), it is possible to omit the safety factor in consideration of the aging deterioration of the rubberized cloth material such as the bags 12A and 12B, and the material cost can be reduced.

  On the other hand, if the undulating gate of the multiple bag type (same for the single bag type) 3 is used, the bag bodies 12A and 12B are respectively placed in the protective sheets 13A and 13B curved in a substantially U shape in a side view. Since each bag 12A, 12B is protected by being stored and does not need to be held by being adhered to the entire surface of each protective sheet 13A, 13B, even if a part of them is adhered, aging When the adhesiveness is lowered, there is no possibility that the bags 12A and 12B peel off from the protective sheets 13A and 13B and fall off.

  Moreover, since the downstream part of each bag 12A, 12B is covered and protected by each protection sheet 13A, 13B, there is less risk of damage even if a driftwood or the like hits the water.

  Further, the tip portions 13a and 13b of the protective sheets 13A and 13B are bent and sandwiched between the concave and convex portions 14a and 14b by bolting the upper metal fitting 14B to the lower metal fitting 14A from above, and the concrete foundation 46 Therefore, the front end portions 13a and 13b of the protective sheets 13A and 13B are firmly fixed in the pits 46a of the concrete foundation 46.

  Further, since the tip portions 13a and 13b of the protective sheets 13A and 13B are overlapped with each other and bonded together, the bolt holes 13c of the tip portions 13a and 13b of the protective sheets 13A and 13B are formed. The strength is improved, and the bolt hole 13a can be prevented from being extended and broken. Thus, the strength of the bolt 13c holes in the tip portions 13a and 13b of the protective sheets 13A and 13B can be improved.

3 Undulating gate 5 Door body 7 Hinge sheet 12 Bag body 12A, 12B Bag body 13 Protective sheet 13A, 13B Protective sheet 13a, 13b Tip portion 14A Upper metal part 14B Lower metal part 14a Concave part 14b Convex part 15 Bolt 16 Supply / exhaust port 25 Temporary closing Equipment 30 Dam dam body 31 Flood spout gate 36 Side steel pipe sheet pile 37 Front and rear steel pipe sheet pile 38 Foundation stand 45 Earth and stone 46 Concrete foundation U Standing position D Lodging position O Rotating fulcrum

Claims (3)

Of the plurality of spillway gates on the upstream side of the dam body, on both the left and right sides of a part of the spillway gate to be repaired, a steel pipe sheet pile for a side water stop having a height substantially equivalent to the upper part of the spillway gate The front and rear water-stop steel pipe sheet piles having a height substantially equivalent to the lower part of the spillway gate are driven into the bottom of the water between the side water-stop steel pipe sheet piles. Temporary deadline for repairing spillway gates on dam dams by installing a foundation stand inside the steel pipe sheet pile and installing a weir mechanism with a height approximately equivalent to the upper part of the spillway gate on this foundation stand Because
The damming mechanism is supported by a flexible hinge sheet on the upper surface of the foundation platform, and between an upstream standing position and a downstream side between the door-contacting piers inside the side water-stopping steel pipe sheet pile. It consists of a door body that can rotate between the lying position and a flexible bag body that is installed on the downstream side of this door body. The front portion of the door body is turned to a height substantially corresponding to the lower part of the spillway gate as it is rotated to an upright position substantially equivalent to the upper part of the spillway gate and the bag body is contracted by discharging the fluid. Temporary deadline facility for repairing spillway gates on dam dams, characterized in that it is a undulating gate that can be turned to the position where it is lying down. The bag body, the protective sheet, and the hinge sheet are made of a rubberized cloth of the same material and the same thickness, and the bag body is housed and protected in a protective sheet that is curved in a substantially U shape when viewed from the side. The top end parts of the sheets are stacked one on top of the other and bonded together,
A lower metal fitting having a concave or convex portion in the width direction is provided on the upper surface of the base, and an upper metal fitting having a convex or concave portion in the width direction opposite to the lower metal fitting is provided, and the tip portion of the protective sheet is , By bolting from above to the lower bracket through the bolt hole at the tip of the protective sheet from the upper bracket, it is bent and pinched between the concavo-convex parts, and the base stand near the pivot point of the door body While detachably fixed to the top surface,
The temporary closing facility for repairing a spillway gate of a dam levee according to claim 1, wherein the protective sheet storing and protecting the bag body is not fixed to the rear surface of the door body and the upper surface of the foundation.   A plurality of the bag bodies are provided in the vertical direction, and each bag body is housed and protected in each protective sheet, and the tip portions of the protective sheets are overlapped with each other and bonded together. The temporary deadline facility for repairing a spillway gate of a dam body according to claim 2, wherein the dam body is repaired.