Membrane-like lifting gate

Abstract

To provide a membrane-like lifting gate that suppresses overflow from both ends of a membrane body in a span direction in a raised position during overflow, and improves reliability by providing a membrane body fixing structure that is inexpensive and ensures its strength.SOLUTION: In a membrane-like lifting gate 1, an overflow recess 55 that opens to the downstream side is formed at a downstream end including a lifting fitting 16 of a membrane body 10 in a collapsed state. When the membrane body 10 is pulled up, a bottom surface of the overflow recess 55 is positioned lower than fixed positions of both spanwise ends of the membrane body 10 and of both spanwise ends of a pair of side wall surfaces 4, 4 of a waterway 5. This makes it possible to suppress overflow from both spanwise ends of the membrane body 10 in a pulled-up posture during overflow, and as a result, deterioration and damage of portions of the membrane body 10 folded over at both spanwise ends when it is pulled up can be suppressed, thereby improving reliability.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a membrane-type undulating gate that can stop water, dam up water, or allow water to pass through by undulating a flexible membrane body arranged along the span of a U-shaped waterway when viewed from the front. In addition, damming does not simply stop the water flow by raising the upstream water level by raising the gate, but also includes the state in which water overflows and flows if the water level exceeds the top of the membrane. [Background technology]

[0002] Patent Document 1 discloses a conventional membrane undulating gate, a sheet weir, in which the upstream end of the membrane (sheet) is fixed to the bottom of the waterway, and a rod attached to the downstream end of the membrane (sheet) spanning the width (span) of the waterway is lifted from the upstream side with a winch to raise and lower the weir. The sheet weir described in Patent Document 1 has the advantage of being easily attached to the constructed waterway, and is used as a simple undulating gate that can be constructed in a short time.

[0003] However, the sheet-type weir described in Patent Document 1 has problems, such as leakage from the membrane folded back on the side wall of the waterway during water blocking, which causes complex deformation. Specifically, in the sheet-type weir described in Patent Document 1, as the membrane is lifted, the downstream end of the membrane moves upstream and upward, becoming the lifting point. As a result, the sections on both sides of the membrane along the side wall of the waterway in the span direction are folded and deformed in response to the upward movement of the membrane along the bottom of the waterway. As the water level rises in the waterway, water pressure from upstream acts on these deformed sections, causing further deformation. This deformation can sometimes cause the sections on both sides of the membrane along the side wall of the waterway in the span direction to be lower than the lifting point of the membrane, resulting in leakage from these sections.

[0004] Furthermore, the membrane's function is not only to stop or dam water, but also to safely transmit the tension generated by the water pressure acting on the membrane to the bottom of the waterway or the lifting portion of the membrane. For this reason, for example, rubberized fabric is used as the membrane material. Rubberized fabric is a material in which fibers are coated with rubber, and the rubber coating prevents water from entering the membrane while the internal fibers transmit the tension generated by the water pressure. As described above, the membrane needs to transmit the generated tension to the bottom of the waterway or the lifting portion. Therefore, the fixing structure for fixing the upstream end of the membrane to the bottom of the waterway and the support structure for lifting and supporting the lifting portion of the membrane generally use a method of horizontally crimping the membrane using mounting brackets and bolts. However, when the membrane is horizontally crimped using mounting brackets and bolts, problems arise, such as the difficulty of evenly transmitting the tension acting on the membrane to the mounting brackets due to the influence of membrane deformation, etc.

[0005] In the case of the rubberized fabric mentioned above, the rubber deforms over time, causing it to lose its initial pressure and slip out. Furthermore, the membrane can be damaged by concentrated loads on specific areas. To address this issue, various measures have been taken, such as providing unevenness on the crimping surface of the mounting bracket, increasing the rigidity of the mounting bracket, and using multiple bolts. However, this increases costs and increases the number of holes in the membrane due to the placement of bolts, which in turn creates problems that weaken the membrane.

[0006] To address these issues, a membrane-type undulating gate has been proposed as described in Patent Document 2. The membrane-type undulating gate described in Patent Document 2 addresses the issue of water leakage from parts of the membrane body arranged along the side wall surfaces of the waterway, where the parts on both sides in the span direction are located lower than the lifting point of the membrane body, by configuring the uppermost fixed points on the uppermost sides between both ends in the span direction of the membrane body and the pair of side wall surfaces of the waterway to be higher than the highest point at which the downstream end of the membrane body is raised to the maximum.

[0007] However, when the membrane undulating gate described in Patent Document 2 is used as an overflow weir, if the overflow volume increases and the overflow depth deepens, overflow occurs across the entire span of the waterway. In other words, even with the membrane undulating gate described in Patent Document 2, overflow occurs from the top of the folded-back portion on both sides of the membrane when the gate is raised. This overflow and the resulting flow disturbances make both sides of the membrane vulnerable to deterioration and damage, raising concerns about durability. Furthermore, the resulting flow disturbances could cause uneven wear on the waterway lining and adversely affect the downstream side of the waterway. Furthermore, when the membrane is raised, parts of both sides of the membrane in the span direction could come into contact with the mounting brackets attached to a pair of sidewalls of the waterway, damaging them and potentially reducing durability.

[0008] Furthermore, the membrane undulating gate described in Patent Document 2 addresses the issue of securing the membrane ends by forming the upstream end of the membrane into a wedge shape that thickens toward the upstream side, and the lifting end provided downstream of it into a wedge shape that thickens toward the downstream side, and the clamping members that clamp the upstream end and the lifting end, respectively, have inclined portions that abut against the inclined surfaces of the wedge-shaped upstream end and the lifting end. This effectively solves the issue, but forming the upstream end and the lifting end of the membrane into a wedge shape raises the issue of increased costs. Also, the bolts that attach the clamping members penetrate the membrane, requiring bolt holes to be drilled into the membrane. These bolt holes are prone to leaking, and the additional processing work (higher costs) is also an issue. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Japanese Patent Application Publication No. 11-229357 [Patent Document 2] Japanese Patent Application Publication No. 2022-143971 Summary of the Invention [Problem to be solved by the invention]

[0010] The present invention has been made in consideration of these points, and aims to provide a membrane-type undulating gate that suppresses overflow from both ends of the membrane body in the span direction when it is in a raised position, and that is inexpensive and has a membrane body fixing structure that ensures its strength, thereby improving reliability. [Means for solving the problem]

[0011] As a means for solving the above-mentioned problems, the present invention provides, as claimed in claim 1, a membrane-type undulating gate in which the upstream end of a flexible membrane body arranged across the span of a U-shaped waterway when viewed from the front is fixed to the upstream side of the waterway, and both radial ends of the membrane body are fixed to a pair of side wall surfaces of the waterway, and the downstream end of the membrane body is freely raised and lowered and movable along the waterway direction, and the downstream end of the membrane body is raised using a lifting fitting and moved to the upstream side of the waterway to stop water or dam it up, and the downstream end of the membrane body including the lifting fitting is formed with an overflow recess that opens to the downstream side when in a collapsed state, and when the membrane body is pulled up, the bottom surface of the overflow recess is positioned at a lower position than the fixed positions of both radial ends of the membrane body and the pair of side wall surfaces of the waterway.

[0012] In the invention of claim 1, when the membrane is raised during damming, the overflow recess functions as an overflow section, and the folded-back sections at both ends of the membrane function as non-overflow sections. This prevents overflow from the folded-back sections on both sides of the membrane during lifting. This prevents the folded-back sections on both sides of the membrane from being exposed to overflow and the resulting flow disturbances. This prevents deterioration and damage to these sections, improving their durability and reliability. Furthermore, the flow conditions during overflow are generally uniform and stable across the span, preventing uneven wear on the channel lining and preventing adverse effects on the downstream side of the channel.

[0013] The invention described in claim 2 is characterized in that, in the invention of claim 1, the fixed positions of both ends of the span direction are positioned above the moving trajectory of both ends of the span direction of the lifting fitting during the process of lifting the downstream end of the membrane body via the lifting fitting and moving it upstream of the waterway.

[0014] As a premise, the lifting fittings must be sufficiently expanded in the spanwise direction, and the spanwise length of the overflow recess must be as large as possible to ensure the water-carrying capacity of the overflow. Furthermore, the non-overflow sections of the folded-back sections on both sides of the membrane in the raised position must be high enough to accommodate the overflow water depth, and the connection between both ends of the membrane in the spanwise direction and the pair of side walls of the waterway must be secure. With the above configuration, both ends of the membrane in the spanwise direction are positioned as close as possible to the pair of side walls of the waterway. Furthermore, when the membrane is raised, both ends of the lifting fitting in the spanwise direction are positioned close to a pair of mounting brackets (mounting brackets attached to each of the pair of side walls of the waterway for attaching both ends of the membrane in the spanwise direction). Therefore, when the membrane is raised, parts of both sides of the membrane in the spanwise direction come into contact with the pair of mounting brackets, which may cause damage and impair durability.

[0015] In view of this, in the invention of claim 2, when the membrane body is lifted, both ends of the lifting fitting in the span direction do not overlap with the mounting fittings (fixing positions of both ends in the span direction) provided on a pair of side walls of the waterway, so that in the process of lifting the membrane body, parts of both sides of the membrane body in the span direction do not come into contact with the pair of mounting fittings, and there is no risk of the parts of both sides of the membrane body in the span direction being damaged, etc. Furthermore, because there is no need to consider contact between the parts of both sides of the membrane body in the span direction and the pair of mounting fittings, the span direction length of the lifting fitting, and therefore the span direction length of the overflow recess, can be increased accordingly, and the water flow capacity of the overflow can be ensured.

[0016] The invention described in claim 3 is characterized in that, in the invention of claim 1, the fixed positions at both ends of the span direction extend horizontally above the lifting fittings when the membrane body is lifted, and the fixed positions at the upstream end of the membrane body and the upstream end of the bottom surface and a pair of side wall surfaces of the waterway extend downward from the fixed positions at both ends of the span direction so as to form a C-shape when viewed from the front. In the invention of claim 3, the membrane body can be formed into a roughly rectangular shape in plan view, making its design easier and reducing the number of design steps. In addition, the fixing positions at both ends in the span direction extend horizontally, and the fixing position at the upstream end extends to present a U-shape in front view, so that the installation of the membrane body to the waterway is simple and easy, resulting in cost reduction.

[0017] In the invention described in claim 4, in the invention of claim 1, the fixing structure between the end of the membrane body and the lifting fitting, and the fixing structure between the end of the membrane body and the inner wall surface of the waterway are characterized in that the wedge-shaped end formed by wrapping the end of the membrane body around a core material with a wedge-shaped cross section is fixed in a wedge-shaped storage space provided in the membrane body fixing portion to be fixed. In the invention of claim 4, the wedge-shaped end is formed by winding the end of the membrane body around a wedge-shaped core material, so there is no need to mold the end of the membrane body into a wedge shape, which can suppress cost increases. Also, this fixing structure does not use fixing bolts inserted into the membrane body, so there is no need to process bolt holes in the membrane body, which can reduce costs and prevent water leakage.

[0018] The membrane-type undulating gate of the present invention can suppress overflow from both ends of the membrane body in the span direction when it is in a raised position during overflow, and can improve reliability by providing a fixing structure for the membrane body that is inexpensive and ensures its strength. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 1 is a perspective view showing an overall image of a membrane undulating gate according to an embodiment of the present invention. [Figure 2] FIG. 2 is a partially enlarged perspective view of FIG. [Figure 3]FIG. 3 is a cross-sectional view showing a state in which a lifting fitting is fixed to the downstream end of a membrane body employed in a membrane undulating gate according to an embodiment of the present invention. [Figure 4] FIG. 4 is a cross-sectional view showing a state in which the spanwise end of the membrane body employed in the membrane undulation gate according to the embodiment of the present invention is fixed to the side wall surface of the waterway by a first mounting fixture. [Figure 5] FIG. 5 is a perspective view showing a water-stopping or damming state in which the downstream end of the membrane body employed in the membrane undulating gate according to the embodiment of the present invention is raised to the maximum extent possible via a lifting fixture. [Figure 6] FIG. 6 is a partially enlarged perspective view of FIG. DETAILED DESCRIPTION OF THE INVENTION

[0020] Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. As shown in FIG. 1, a membrane-type undulating gate 1 according to an embodiment of the present invention is installed in a waterway 5. The waterway 5 has a bottom surface 3 and a pair of opposing sidewall surfaces 4, 4 extending vertically upward from both ends of the bottom surface 3 in the span direction, and is U-shaped when viewed from the front. The membrane-type undulating gate 1 according to this embodiment is configured to stop water, block water, or allow water to pass through as the membrane body 10 rises and falls in response to the operation of an opening / closing device 70, which will be described later. In the following description, the width direction of the waterway 5 is referred to as the span direction, and the upstream and downstream sides are defined along the direction of the water flow in the waterway 5. In FIGS. 1 to 3, 5, and 6, the left side corresponds to the upstream side, and the right side corresponds to the downstream side.

[0021] As shown in Figures 1 and 2, the membrane-type undulating gate 1 of this embodiment has the upstream end of the membrane body 10 fixed to the bottom surface 3 of the waterway 5 and the upstream side of a pair of side wall surfaces 4, 4 by second and third mounting brackets 57, 58 described below, and both spanwise ends of the membrane body 10 fixed to a pair of side wall surfaces 4, 4 of the waterway 5 by first mounting brackets 56, respectively, so that the downstream end of the membrane body 10 can be freely raised and lowered and moved along the waterway direction.

[0022] In the deployed state, the membrane body 10 includes a membrane body recess 12 (see Figure 2), which will be described later, and is formed into a generally rectangular shape overall. The membrane body 10 is made of rubberized cloth. The membrane body 10 is formed into a relatively light, flexible sheet. By using rubberized cloth, the membrane body 10 exhibits a water-blocking function due to the rubber, and is configured to safely and reliably transmit the tension of the membrane body 10 through the inserted fibers. Referring to Figures 1 and 2, when the membrane body 10 is in a water-passing state with the membrane body 10 laid down, the generally rectangular central portion 10a of the membrane body 10 abuts against the bottom surface 3 of the waterway 5, and the generally rectangular portions 10b, 10b extending vertically upward from both spanwise ends of the portion 10a abut against a pair of side wall surfaces 4, 4 of the waterway 5, respectively.

[0023] 1 to 3, when the membrane body 10 is in a laid-down state and water is passing through it, the membrane body 10 has a portion 10a that is arranged along the bottom surface 3 of the waterway 5, and a lifting fitting 16 is fixed to the downstream end of the portion 10a. A membrane body-side recess 12 that opens to the downstream side is formed at the downstream end of portion 10a of the membrane body 10 in the laid-down state. A pair of membrane body-side protrusions 14, 14 that protrude downstream are formed at both ends in the span direction of the downstream end of portion 10a of the membrane body 10 to form the membrane body-side recess 12. As will be described later, a core material 51 with a wedge-shaped cross section is wound around and folded back on the upstream end of the membrane body 10, both ends in the span direction, and the bottom of the membrane body-side recess 12 to form wedge-shaped end portions 53 that are integrally formed. The lifting fitting 16 comprises a base plate 20 formed in a U-shape when viewed from above, a pair of chain connecting fittings 21, 21 that clamp and fix the membrane side protrusion 14 of the membrane body 10 onto the base plate 20, and to which the lifting chains 76, 76 are connected, and a plurality of membrane body fixing fittings 22, 22 that fix the bottom (wedge-shaped end 53) of the membrane side recess 12 of the membrane body 10 together with the base plate 20.

[0024] 6, the base plate 20 is U-shaped in plan view and includes a connecting plate portion 25 extending in the radial direction and a pair of protruding plate portions 26, 26 protruding downstream from both radial ends of the connecting plate portion 25. A pair of chain links 21, 21 are provided adjacent to the side wall surfaces 4, 4 of the waterway 5. Referring to FIGS. 2 and 3, the chain link 21 includes a pressure plate 28 that is rectangular in plan view, a connection bar 29 erected in the center of the pressure plate 28 in the radial direction and extending toward the waterway, and a chain joint 30 rotatably connected to the downstream end of the connection bar 29. The membrane-side protruding portion 14 of the membrane 10 is sandwiched between the protruding plate portion 26 of the base plate 20 and the pressure plate 28 of the chain link 21 and fixed by a plurality of fixing bolts 32, 32.

[0025] 2 and 3, a plurality of membrane fixing brackets 22 are arranged with gaps between them along the longitudinal direction of the connecting plate portion 25 of the base plate 20. The membrane fixing bracket 22 includes a bolt fixing plate portion 35 fixed to the base plate 20 by a fixing bolt 41, and a membrane fixing portion 36 provided upstream from the upstream end of the bolt fixing plate portion 35. The bolt fixing plate portion 35 is provided with a pair of reinforcing ribs 39 spaced apart along the span direction. The pair of reinforcing ribs 39 is formed at multiple locations spaced apart along the span direction for each bolt fixing plate portion 35. The reinforcing rib 39 is formed in a rectangular plate shape. The reinforcing rib 39 stands upright from the bolt fixing plate portion 35 and extends along the waterway direction. The reinforcing rib 39 is connected to a fixed orthogonal wall portion 43 of the membrane fixing portion 36, which will be described later. A fixing bolt 41 is arranged between the pair of reinforcing ribs 39.

[0026] 3, the membrane fixing portion 36 includes a fixed orthogonal wall portion 43 that extends upward perpendicularly from the upstream end of the bolt fixing plate portion 35, and a fixed inclined wall portion 44 that slopes downward from the upper end of the fixed orthogonal wall portion 43 toward the upstream side. A gap 46 equivalent to twice the thickness of the membrane 10 is provided between the tip of the fixed inclined wall portion 44 and the base plate 20. In addition, a wedge-shaped storage space 48 that tapers toward the upstream side is formed in the area surrounded by the base plate 20, the fixed orthogonal wall portion 43 of the membrane fixing portion 36, and the fixed inclined wall portion 44 of the membrane fixing portion 36.

[0027] As described above, a wedge-shaped end portion 53 is integrally formed at the bottom of the membrane recess 12 at the downstream end of the membrane 10. The wedge-shaped end portion 53 is wound around a core material 51 having a wedge shape (triangular cross section) tapering toward the upstream side and folded back toward the upstream side. The wedge-shaped end portion 53 is then positioned in a wedge-shaped accommodation space 48 surrounded by the base plate 20, the fixed orthogonal wall portion 43 of the membrane fixing portion 36, and the fixed inclined wall portion 44 of the membrane fixing portion 36, with the wedge shapes aligned. The bolt fixing plate portion 35 of the membrane fixing bracket 22 is then fixed to the base plate 20 by a fixing bolt 41 located between a pair of reinforcing ribs 39, 39. The portion of the wedge-shaped end portion 53 of the membrane 10 folded back toward the upstream side passes through the gap 46 between the tip of the fixed inclined wall portion 44 and the base plate 20 and extends a certain distance toward the upstream side. This fixing structure serves as a fixing structure between the end of the membrane 10 (the wedge-shaped end 53 provided at the bottom of the membrane-side recess 12) and the lifting metal fitting 16.

[0028] 1 and 2, as described above, when the lifting fitting 16 is connected to the downstream end of the membrane body 10, an overflow recess 55 that is in a collapsed state and opens to the downstream side is formed at the downstream end of the membrane body 10 including the lifting fitting 16. This overflow recess 55 is formed long along the span direction.

[0029] In this embodiment, plate materials are used for the base plate 20 and bolt fixing plate portion 35 that make up the lifting fitting 16, and their thickness is reduced to minimize obstruction to water flow on the riverbed when water is flowing. This makes it possible to install the lifting fitting 16 in an existing waterway without changing the waterway civil engineering structure. However, if the size of the waterway 5 increases and rigidity of the lifting fitting 16 is required, the thickness of the base plate 20 and bolt fixing plate portion 35 of the lifting fitting 16 must be increased. In such cases, consideration should be given to appropriately lowering the bottom surface 3 of the waterway 5 on which the lifting fitting 16 is installed so that the lifting fitting 16 can be stored.

[0030] In addition, in this embodiment, a pair of pressure plates 28 are fixed to the base plate 20 at both spanwise ends (non-overflow portions described below) of the lifting fitting 16 via the membrane side protrusion 14 of the membrane 10, and a chain joint 30 is provided on this pressure plate 28 via a connecting bar 29, but chain joints 30 may also be provided via a connecting bar 29 at both spanwise ends of a series of membrane fixing fittings 22, 22 arranged in a row with gaps in the spanwise direction.

[0031] 1, 2, and 4, both spanwise ends of the membrane body 10 are fixed to the upper parts of a pair of side wall surfaces 4, 4 of the waterway 5 by a pair of first mounting brackets 56, 56, respectively. The first mounting bracket 56 comprises a base plate 61 that is rectangular in plan view and extends in the waterway direction, and a plurality of membrane body fixing brackets 22, 22 that fix the spanwise ends of the membrane body 10 together with the base plate 61. The base plate 61 is positioned horizontally in contact with the side wall surface 4 of the waterway 5. The base plate 61 is fixed to the side wall surface 4 by a plurality of anchor bolts 63, 63 that are positioned at intervals along the waterway direction.

[0032] A plurality of membrane fixing brackets 22, 22 are arranged with gaps between them along the longitudinal direction of the base plate 61. The membrane fixing bracket 22 includes a bolt fixing plate portion 35 fixed to the base plate 61 by a fixing bolt 41, and a membrane fixing portion 36 provided downward and continuing from the lower end of the bolt fixing plate portion 35. The bolt fixing plate portion 35 is provided with a pair of reinforcing ribs 39, 39 spaced apart along the waterway direction. The pair of reinforcing ribs 39, 39 is formed in multiple locations spaced apart along the waterway direction for each bolt fixing plate portion 35. The reinforcing rib 39 is formed in a rectangular plate shape. The reinforcing rib 39 stands upright from the bolt fixing plate portion 35 and extends downward. The reinforcing rib 39 is connected to a fixed orthogonal wall portion 43 of the membrane fixing portion 36, which will be described later. A fixing bolt 41 is arranged between the pair of reinforcing ribs 39, 39.

[0033] 4, the membrane fixing portion 36 includes a fixed orthogonal wall portion 43 that extends perpendicularly from the lower end of the bolt fixing plate portion 35 toward the inside of the waterway 5, and a fixed inclined wall portion 44 that slopes downward from the tip of the fixed orthogonal wall portion 43 toward the base plate 61. A gap 46 equivalent to twice the thickness of the membrane 10 is provided between the tip (lower end) of the fixed inclined wall portion 44 and the base plate 61. In addition, a wedge-shaped storage space 48 that tapers downward is formed in the area surrounded by the base plate 61, the fixed orthogonal wall portion 43 of the membrane fixing portion 36, and the fixed inclined wall portion 44 of the membrane fixing portion 36.

[0034] As described above, both ends of the membrane 10 in the spanwise direction are wrapped around a core material 51 having a wedge-shaped cross section (triangular cross section) tapering downward, and are folded back to form integrally wedge-shaped end portions 53. The wedge-shaped end portions 53 of the membrane 10 are then positioned in a wedge-shaped accommodation space 48 surrounded by the base plate 61, the fixed orthogonal wall portion 43 of the membrane fixing portion 36, and the fixed inclined wall portion 44 of the membrane fixing portion 36, with the wedge shapes aligned. The bolt fixing plate portion 35 of the membrane fixing bracket 22 is then fixed to the base plate 61 by a fixing bolt 41 located between a pair of reinforcing ribs 39, 39. The downwardly folded portion of the wedge-shaped end portion 53 of the membrane 10 extends downward by a certain length, passing through the gap 46 between the tip (lower end) of the fixed inclined wall portion 44 and the base plate 61. This fixing structure serves as a fixing structure between the spanwise end (wedge-shaped end 53) of the membrane body 10 and the first mounting fixture 56 provided on the side wall surface 4 of the waterway 5.

[0035] 5 and 6, the spanwise end fixing positions where both spanwise ends of the membrane body 10 are fixed by the first mounting fittings 56 extend horizontally above the lifting fittings 16 when the membrane body 10 is, for example, fully lifted. In other words, this fixing position is located above the moving trajectory of both spanwise ends of the lifting fittings 16 during the process of moving the downstream end of the membrane body 10 to the upstream side of the waterway 5 while lifting it via the lifting fittings 16.

[0036] 1 and 2, the upstream end (wedge-shaped end 53) of the membrane body 10 is fixed to the bottom surface 3 of the waterway 5 by a second mounting bracket 57, and is also fixed to a pair of side wall surfaces 4, 4 by a third mounting bracket 58. The second mounting bracket 57 includes a base plate 61 having a shape in a plan view that extends in the span direction, and a plurality of membrane body fixing brackets 22, 22 that fix the upstream end of the membrane body 10 together with the base plate 61. The base plate 61 is arranged along the span direction while abutting against the bottom surface 3 of the waterway 5. The base plate 61 is fixed to the bottom surface 3 of the waterway 5 by a plurality of anchor bolts 63, 63 arranged at intervals along the span direction. A plurality of membrane body fixing brackets 22, 22 are arranged along the longitudinal direction of the base plate 61 with gaps between them. The basic configuration of the membrane fixing metal fitting 22 of the second mounting metal fitting 57 is the same as the basic configuration of the membrane fixing metal fitting 22 of the first mounting metal fitting 56, so a detailed description thereof will be omitted here.

[0037] The third mounting bracket 58 comprises a base plate 61 having a shape extending in the vertical direction in a plan view, and a membrane fixing bracket 22 that fixes the upstream end of the membrane 10 together with the base plate 61. The base plate 61 is positioned below the upstream end of the first mounting bracket 56, in contact with the side wall surface 4 of the waterway 5, along the vertical direction. The base plate 61 is fixed to the side wall surface 4 of the waterway 5 by a plurality of anchor bolts 63, 63 that are spaced apart along the vertical direction. The membrane fixing bracket 22 is positioned along the longitudinal direction of the base plate 61. The basic configuration of the membrane fixing bracket 22 of the third mounting bracket 58 is the same as the basic configuration of the membrane fixing bracket 22 of the first and second mounting brackets 56, 57, so a detailed description will be omitted here. The upstream end fixing position of the membrane body 10 between the upstream end thereof and the bottom surface 3 and pair of side wall surfaces 4, 4 of the waterway 5 by the second and third mounting brackets 57, 58 forms a U-shape downward when viewed from the front from the position where both spanwise ends of the membrane body 10 are fixed to the pair of side wall surfaces 4, 4 of the waterway 5 by the pair of first mounting brackets 56, 56.

[0038] In this embodiment, the base plate 61 of the first to third mounting brackets 56 to 58 is fixed to the bottom surface 3 and side wall surface 4 of the waterway 5 with multiple anchor bolts 63, 63 so that post-construction to an existing waterway is possible, but the base plate 61 may also be embedded in the bottom surface 3 and side wall surface 4. In this embodiment, the anchor bolts 63, 63 are not necessary. Also, in this embodiment, the base plate 61 is used in the first to third mounting brackets 56 to 58, but the base plate 61 may be replaced by the bottom surface 3 or side wall surface 4 of the waterway 5 if the bottom surface 3 or side wall surface 4 of the waterway 5 is sufficiently smooth. In this embodiment, anchor bolts are used to fix the membrane fixing brackets 22 of the first to third mounting brackets 56 to 58 to the bottom surface 3 or side wall surface 4 of the waterway 5. In this embodiment, the fixing structure of the membrane body 10 to the bottom surface 3 and side wall surface 4 of the waterway 5 is common to the bottom surface 3 and side wall surface 4, but for the side wall surface 4 where the acting tension of the membrane body 10 is relatively small, it is also possible to select a fixing structure using a normal clamping metal fitting other than the wedge-shaped fixing structure that creates a wedge effect adopted in this embodiment.

[0039] In the above-mentioned first to third mounting brackets 56-58, when the wedge-shaped end 53 of the membrane 10 is fixed together with the base plate 61 by multiple membrane fixing brackets 22, 22, the wedge-shaped end 53 of the membrane 10 is pressed against the base plate 61, as a result, good watertightness can be ensured. When water accumulates in the waterway 5, the water level rises and the water pressure increases, making it more likely to leak. However, at the same time, the tension of the membrane 10 increases, and the wedge effect increases the bearing pressure of the wedge-shaped end 53 of the membrane 10 on the base plate 61, improving watertightness. Note that it is assumed that the base plate 61 is caulked between the bottom surface 3 and side wall surface 4 of the waterway 5 to prevent water leakage, and that the base plate 61 is sufficiently tightly attached and fixed to the bottom surface 3 and side wall surface 4 of the waterway 5 by multiple anchor bolts 63, 63.

[0040] Additionally, the reinforcing ribs 39, 39 provided on the membrane fixing fittings 22 of the lifting fitting 16 and the first to third mounting fittings 56-58 increase the rigidity of the membrane fixing fittings 22 so that the load acting due to the tension of the membrane 10 is sufficiently transmitted to the base plate 61, and also ensure that the joint surface between the bolt fixing plate portion 35 and the base plate 61 is sufficiently large. The reinforcing ribs 39 and fixing bolts 41 of the membrane fixing fittings 22 and the anchor bolts 63 are arranged in multiple locations at intervals along the span direction so that there are no problems from the standpoints of watertightness and strength.

[0041] Next, the opening and closing device 70 will be described. Referring to Fig. 1, a support base 65 is provided so as to span the upper surfaces of a pair of side wall surfaces 4, 4 of the waterway 5. The opening and closing device 70 is disposed on the support base 65. The opening and closing device 70 includes a reducer 73 to which a manual handle 72 is detachably connected, a rotating shaft 74 to which rotation from the reducer 73 is transmitted, a pair of chain wheels 75, 75 connected near both axial ends of the rotating shaft 74 so as not to rotate relative to each other, and lifting chains 76, 76 wound around the chain wheels 75, 75. The reducer 73 is disposed on one longitudinal end of the support base 65. The rotating shaft 74 is disposed above the support base 65 with a gap therebetween.

[0042] A pair of chain wheels 75, 75 are connected near both axial ends of the rotating shaft 74 so as not to rotate relative to each other. One end of a lifting chain 76 is looped around the chain wheel 75. The lifting chain 76 can be wound or unwound by the rotation of the chain wheel 75 in the forward or reverse direction as the rotating shaft 74 rotates. The other end of the lifting chain 76 is connected to a chain joint 30 of a lifting fitting 16 fixed to the downstream end of the membrane body 10. In this embodiment, a lifting chain 76 is used, but a wire rope or the like may also be used.

[0043] 1, 2, 5, and 6, the opening / closing device 70 is operated, that is, an operator connects the manual handle 72 to the reducer 73 and rotates the manual handle 72 in the forward direction, which causes the pair of chain wheels 75, 75 to rotate in the forward direction along with the forward rotation of the rotating shaft 74. As a result, due to the forward rotation of the pair of chain wheels 75, 75, the lifting chains 76, 76 are wound around the pair of chain wheels 75, 75, and the downstream end of the membrane body 10 moves upstream while being lifted via the lifting fitting 16.

[0044] As mentioned above, referring to Figures 5 and 6, in the process of lifting the downstream end of the membrane body 10 via the lifting fitting 16 and moving it upstream of the waterway 5, the positions at which both spanwise ends of the membrane body 10 are fixed by the first mounting fittings 56 to a pair of side wall surfaces 4, 4 of the waterway 5 are positioned above the movement trajectory of both spanwise ends of the lifting fittings 16.Therefore, when the membrane body 10 is lifted, the movement trajectory of both spanwise ends of the lifting fittings 16 does not overlap with the first mounting fittings 56 (both spanwise fixing positions) provided on the pair of side wall surfaces 4, 4 of the waterway 5, and in the process of lifting the membrane body 10, parts of both spanwise sides of the membrane body 10 do not come into contact with the pair of first mounting fittings 56, 56 or the multiple anchor bolts 63, 63.

[0045] 5 and 6, when the membrane body 10 is raised, for example, to its maximum extent, the bottom surface of the overflow recess 55 provided at the downstream end of the membrane body 10, including the lifting fittings 16, is positioned lower than the fixed positions (first mounting fittings 56) of both spanwise ends of the membrane body 10 and a pair of side wall surfaces 4, 4 of the waterway 5. As a result, when overflow occurs, the overflow recess 55 at the downstream end of the membrane body 10, including the lifting fittings 16, functions as an overflow section, and the folded-back portions at both spanwise ends of the membrane body 10 in the raised position function as non-overflow sections. As a result, when the membrane body 10 is raised, i.e., when the membrane body 10 is in the raised position, overflow from the folded-back portions at both spanwise ends of the membrane body 10 can be suppressed.

[0046] On the other hand, when changing from a water-stopping or dammed state to a normal water-flowing state, the opening / closing device 70 is operated, i.e., the worker rotates the manual handle 72 in the opposite direction, causing the pair of chain wheels 75, 75 to rotate in the opposite directions as the rotating shaft 74 rotates in the opposite direction. As a result, the pair of chain wheels 75, 75 rotate in the opposite directions, unwinding the lifting chains 76, 76, and bringing the portion 10a of the membrane body 10 into contact with the bottom surface 3 of the waterway 5. In this embodiment, the worker rotates the rotating shaft 74 with the manual handle 72 to raise and lower the membrane body 10, but an electric motor may be connected to the reducer 73 so that the membrane body 10 is raised and lowered electrically.

[0047] As explained above, in the membrane undulating gate 1 according to this embodiment, the downstream end of the membrane body 10, including the lifting fittings 16, is formed with an overflow recess 55 that opens the downstream side when in a collapsed state, and when the membrane body 10 is pulled up and in its raised position, the bottom surface of the overflow recess 55 is positioned lower than the fixed positions (first mounting fittings 56) of both spanwise ends of the membrane body 10 and the pair of side wall surfaces 4, 4 of the waterway 5. In addition, the overflow recess 55 is formed as long as possible along the span direction.

[0048] As a result, when the dam is raised, the overflow recess 55 functions as an overflow section, allowing a predetermined amount of overflow water to flow downstream. Meanwhile, the folded-back sections at both spanwise ends of the raised membrane 10 function as non-overflow sections, preventing overflow from these sections. As a result, the folded-back sections at both spanwise ends of the membrane 10 are not exposed to overflow and the resulting flow disturbances, preventing deterioration and damage to these sections and ultimately improving reliability. Furthermore, the flow conditions during overflow are also approximately uniform and stable in the spanwise direction, preventing uneven wear on the lining of the waterway 5 and preventing adverse effects of flow disturbances on the downstream side of the waterway 5.

[0049] Furthermore, in the membrane undulating gate 1 according to this embodiment, the fixed positions (first mounting brackets 56) at both spanwise ends of the membrane body 10 and the pair of side wall surfaces 4, 4 of the waterway 5 are positioned above the movement trajectory of both spanwise ends of the lifting bracket 16 during the process of lifting the downstream end of the membrane body 10 via the lifting bracket 16 and moving it upstream of the waterway 5. This prevents parts of both spanwise ends of the membrane body 10 from coming into contact with the pair of first mounting brackets 56, 56 during the process of lifting the membrane body 10. As a result, when the membrane body 10 is lifted, parts of both spanwise ends of the membrane body 10 are not damaged by contact with the pair of first mounting brackets 56, 56, improving durability and ultimately reliability. Furthermore, since there is no need to consider contact between parts of both sides of the membrane body 10 in the spanwise direction and the pair of first mounting brackets 56, 56 or the multiple anchor bolts 63, 63, the spanwise length of the lifting bracket 16 and, therefore, the spanwise length of the overflow recess 55 can be sufficiently extended, thereby ensuring the water flow capacity of the overflow.

[0050] Furthermore, in the membrane undulating gate 1 according to this embodiment, the spanwise end fixing positions (first mounting brackets 56) that fix both spanwise ends of the membrane body 10 to a pair of side wall surfaces 4, 4 of the waterway 5 extend horizontally above the lifting brackets 16 when the membrane body 10 is lifted, and the upstream end fixing positions (second and third mounting brackets 57, 58) that fix the upstream end of the membrane body 10 to the bottom surface 3 and pair of side wall surfaces 4, 4 of the waterway 5 extend downward from the spanwise end fixing positions so as to form a U-shape in front view. This allows the membrane body 10 to be formed in a roughly rectangular shape in plan view, which simplifies design, shortens design man-hours, and reduces costs. In addition, the fixing positions at both ends of the span direction (first mounting bracket 56) extend horizontally, and the fixing positions at the upstream end (second and third mounting brackets 57, 58) are arranged to form a U-shape when viewed from the front, making the installation of the membrane body 10 to the waterway 5 simple and easy, resulting in cost reduction.

[0051] Furthermore, in the membrane undulating gate 1 according to this embodiment, the fixing structure between the membrane 10 and the lifting fittings 16, and the fixing structure between the membrane 10 and the inner wall surface of the waterway 5, specifically the bottom surface 3 and side wall surface 4, are configured so that the wedge-shaped end 53, formed by wrapping the end of the membrane 10 around a core material 51 with a wedge-shaped cross section, is fixed to the wedge-shaped storage space 48 of the membrane fixing part 36 to be fixed. This ensures sufficient fixing strength. In other words, as the water level in the waterway 5 rises and the water pressure increases, the tension in the membrane 10 also increases, causing a wedge effect that increases the bearing pressure of the wedge-shaped end 53 of the membrane 10 against the base plate 61, improving watertightness.

[0052] Furthermore, the wedge effect prevents the membrane 10 from coming loose, providing a stable holding effect against changes over time such as creep deformation. Furthermore, unlike the prior art (technology described in Patent Document 2), there is no need to form the end of the membrane 10 into a wedge shape, which helps prevent increases in costs. Furthermore, this fixing structure does not use fixing bolts inserted into the membrane 10, so there is no need to machine bolt holes in the membrane 10, reducing costs and preventing water leakage. [Explanation of symbols]

[0053] 1 Membrane undulating gate, 3 Bottom surface (inner wall surface), 4 Side wall surface (inner wall surface), 5 Waterway, 10 Membrane body, 16 Lifting fitting, 36 Membrane body fixing part, 48 Storage space, 51 Core material, 53 Wedge-shaped end, 55 Overflow recess, 56 First mounting fitting (fixing position at both ends in the span direction), 57 Second mounting fitting (fixing position at the upstream end), 58 Third mounting fitting (fixing position at the upstream end)

Claims

1. A membrane-type undulating gate is configured such that the upstream end of a flexible membrane body arranged across the span of a U-shaped waterway when viewed from the front is fixed to the upstream side of the waterway, and both ends of the membrane body in the span direction are fixed to a pair of side wall surfaces of the waterway, and the downstream end of the membrane body is freely raised and lowered and freely movable along the waterway direction, The downstream end of the membrane body is raised by a lifting fixture and moved to the upstream side of the waterway to stop water flow or to dam up the waterway. An overflow recess is formed at the downstream end of the membrane body, including the lifting fitting, and opens to the downstream side when the membrane body is in a collapsed state. A membrane-type undulating gate characterized in that, when the membrane body is pulled up, the bottom surface of the overflow recess is positioned at a position lower than the fixed positions of both spanwise ends of the membrane body and a pair of side wall surfaces of the waterway.

2. A membrane-type undulating gate as described in claim 1, characterized in that the fixed positions at both ends of the span direction are positioned above the movement trajectory of both ends of the lifting fitting in the span direction during the process of lifting the downstream end of the membrane body via the lifting fitting and moving it upstream of the waterway.

3. The spanwise end fixing positions extend horizontally above the lifting fittings when the membrane body is lifted, A membrane-type undulating gate as described in claim 1, characterized in that the upstream end of the membrane body and the upstream end fixing positions of the bottom surface of the waterway and the pair of side wall surfaces extend downward from the spanwise end fixing positions so as to form a U-shape when viewed from the front.

4. The membrane-shaped undulating gate described in claim 1, characterized in that the fixing structure between the end of the membrane body and the lifting fitting, and the fixing structure between the end of the membrane body and the inner wall surface of the waterway are constructed by wrapping the end of the membrane body around a core material with a wedge-shaped cross section, and fixing the wedge-shaped end to a wedge-shaped storage space provided in the membrane body fixing portion to be fixed.

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