hinged gate

Abstract

To provide a hinged gate capable of ensuring watertightness near the hinge without interfering with the swinging action of a door body even when the distance between the door body and a structure that pivotally supports the door body changes due to the swinging of the door body. [Solution] The overflow levee (13) has a plurality of hinges (2) arranged in parallel along the longitudinal direction on the bottom surface (13a) of the overflow levee (13), a door body (3) pivotally supported by the hinges (2) near the lower end of the support surface (32) facing the floodplain (10) so as to be freely swingable, and a watertight member (5) that seals the gap between the overflow levee (13) and the lower end (33) of the door body (3). The watertight member (5) is formed in a rectangular shape with a width equal to that of the door body (3) and is bent vertically, and has a flexible sheet (51) whose lower end (512) is fixed to the overflow levee (13) near the hinges (2) and whose upper end (513) is fixed to the door body (3) near the hinges (2), and a flat anti-bending plate (52) fixed to a flat portion (515) between the bent portion (511) of the flexible sheet (51) and the lower end (512) and upper end (513).

Description

[Technical Field]

[0001] The present invention relates to a hinged gate to be installed on an overflow levee or a sluice gate. [Background technology]

[0002] Flood disasters have been increasing due to abnormal weather in recent years. Until now, the main flood prevention measure has been to build levees on rivers. However, recently, there have been cases where large amounts of rain have fallen locally, such as linear rain bands, and the amount of water rising has exceeded the estimates made when levees were designed, which has led to an increase in flood disasters.

[0003] Therefore, there has been an increase in the construction of flood retarding basins and overflow levees as new flood prevention measures. Flood retarding basins are normally used as farmland, etc., and are facilities that temporarily store water only when the river overflows. The boundary between this flood retarding basin and the river is built with a levee called an overflow levee, which is lower than the surrounding levees, and this allows water to flow into the flood retarding basin before the river water level exceeds the levee, preventing flooding.

[0004] However, if the height of the overflow levee is too low compared to the height of the levee, water will flow into the retarding basin more frequently, hindering its use as farmland, etc. Conversely, if the difference in height between the overflow levee and the levee is small, the amount of water flowing into the retarding basin will be small, and the basin will not be able to keep up with the rising water level of the river, resulting in flooding.

[0005] To address these issues, attempts are being made to use movable gates that can adjust the inflow volume instead of fixed weirs for overflow levees. For example, Non-Patent Document 1 describes an example in which a torque-axis gate structure that can be forcibly collapsed is used. Non-Patent Document 1 argues that movable gates that can be adjusted according to flood level are effective in maximizing the flood control effect of retarding basins.

[0006] The movable gates installed on overflow dikes are required to have high watertightness to prevent unintended inflow from the river into the retarding basin or unintended outflow from the retarding basin into the river. In particular, movable gates with hinges at the bottom of the door body must be able to reliably prevent water leakage through gaps near the hinges.

[0007] As a watertight structure near the hinge of such a movable gate, Japanese Utility Model Application Publication No. 7-12523 proposes a watertight structure for the rotating support part of a watergate door, which has a horizontal cylindrical contact surface formed on the front surface of the lower pivot part of the door body, and a horizontal watertight rubber plate whose front end is fixed to the upper part of the door stop part and whose rear end is in sliding contact with the horizontal cylindrical contact surface (Patent Document 1).

[0008] In other words, the watertight structure described in Patent Document 1 is structured so that the circular center of the horizontal cylindrical contact surface coincides with the center of rotation of the hinge that supports the door body, and the horizontal watertight rubber plate is installed in a position opposite the horizontal cylindrical contact surface, thereby maintaining a constant distance between the horizontal watertight rubber plate and the horizontal cylindrical contact surface, and even if the door body swings around the hinge, the horizontal watertight rubber plate will always be in sliding contact with the horizontal cylindrical contact surface, thereby providing a certain level of water leakage prevention effect. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Japanese Utility Model Application Publication No. 7-12523 [Non-patent literature]

[0010] [Non-Patent Document 1] Tadashi Suetsugu and Fuga Aizawa, "Considerations on measures to maximize the flood control function of flood retarding basins," Japan Association for Soil and Water Conservation, Water Science No. 367, June 2019, pp. 25-37 Summary of the Invention [Problem to be solved by the invention]

[0011] However, the watertight structure described in Patent Document 1 has the problem that if the horizontal cylindrical contact surface and the center of rotation of the hinge cannot be aligned (they are eccentric), the distance between the horizontal watertight rubber plate and the horizontal cylindrical contact surface will not be fixed when the door body swings around the hinge, resulting in variations in the water leakage prevention effect and water leakage.

[0012] In addition, because one end of the horizontal watertight rubber plate is unfixed and cantilevered, there is a problem that when it is subjected to strong water pressure, the free end side will bend or curl up, causing water leakage. One possible method is to increase the strength of the horizontal watertight rubber plate to make it less likely to bend or curl up, but if the strength of the horizontal watertight rubber plate is too high, the friction resistance when it comes into sliding contact with the horizontal cylindrical contact surface will increase, creating a new problem in that it will hinder the swinging movement of the door body.

[0013] Furthermore, when the water level of a river rises, the water can flow back into the land within the levee from the drainage channels installed on the levee, causing flooding even without overflowing the levee. For this reason, conventional drainage channels are equipped with gates that can be opened from both the left and right, such as miter gates, but just like the movable gates installed on overflow levee, these gates also need to be designed to prevent water leakage near the hinges.

[0014] The present invention has been made to solve the above problems, and aims to provide a hinged gate that can ensure watertightness near the hinge without interfering with the swinging movement of the door body, even when the distance between the door body and the structure that supports it changes as the door body swings. [Means for solving the problem]

[0015] The hinged gate of the present invention is installed at a location where the distance between the gate body and the overflow levee changes due to swinging action, and in order to solve the problem of preventing water leakage from the vicinity of the hinge without interfering with the swinging action of the gate body, it is a hinged gate installed on an overflow levee that opens at a step lower than the levee and allows river water to overflow into a retarding basin located inside the levee, and has a plurality of hinges arranged in parallel along the longitudinal direction on the bottom surface of the overflow levee, and is formed in a rectangular shape with a width that can close the opening of the overflow levee, and the vicinity of the lower end of the support surface facing the retarding basin is The watertight member has a door body that is pivotally supported by a hinge so that it can swing freely, and a watertight member that seals the gap between the overflow dam and the lower end of the door body.The watertight member is formed in a rectangular shape with a width equal to that of the door body and is bent upward and downward, and has a flexible sheet whose lower end is fixed to the overflow dam near the hinge and whose upper end is fixed to the door body near the hinge, and a flat anti-bending plate that is fixed to the flat portion between the bent portion of the flexible sheet and the lower and upper ends.

[0016] The hinged gate of the present invention is installed at a location where the distance between the door body and the outlet of the sluice gate changes due to swinging movement, and in order to solve the problem of preventing water leakage from the vicinity of the hinge without interfering with the swinging movement of the door body, it is a hinged gate that is installed at the outlet of a rectangular sluice gate so that it can be opened from both the left and right, and is formed in a rectangular shape with a vertical width that can close the outlet of the sluice gate, and the vicinity of the wall side end of the support surface facing the river side is each hinged. The watertight member has a pair of left and right door bodies pivotally supported by hinges so as to be able to swing freely, and a watertight member that seals the gaps between the left and right side walls and the left and right ends of the door bodies, and the watertight member is formed in a rectangular shape with a vertical width equal to that of the door bodies and is bent to the left and right, and has a flexible sheet with one fixed end fixed to the side wall near the hinge and the other fixed end fixed to the door body near the hinge, and a flat anti-bending plate fixed to the flat part between the bent part of the flexible sheet and each fixed end.

[0017] In addition, as one aspect of the present invention, in order to solve the problem of reliably preventing the watertight member from coming into contact with the hinge when subjected to strong water pressure, the anti-bending plate may be fixed to both the front and back sides of the flat portion of the flexible sheet.

[0018] Furthermore, as one aspect of the present invention, in order to solve the problem of reliably preventing the watertight member from coming into contact with the hinge when subjected to strong water pressure, the watertight member may be positioned closer to the support end of the door body than the hinge, and the bent portion of the watertight member may be bent so as to protrude toward the support end of the door body. [Effects of the Invention]

[0019] According to the present invention, even if the swinging of the door body changes the distance between the door body and the structure that supports it, watertightness near the hinge can be ensured without interfering with the swinging movement of the door body. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is a bird's-eye view showing a first embodiment in which a hinged gate according to the present invention is installed on an overflow levee. [Figure 2] FIG. 2 is a side view showing the hinged gate of the first embodiment. [Figure 3] FIG. 1 is a front view showing a hinged gate according to the first embodiment. [Figure 4] FIG. 2 is an enlarged side view showing the vicinity of the hinge in the state where the overflow dam is closed in the first embodiment. [Figure 5] FIG. 2 is an enlarged side view showing the vicinity of the hinge in the state where the overflow dam is opened in the first embodiment. [Figure 6] A bird's-eye view showing a second embodiment in which a hinged gate according to the present invention is installed in a sluice gate. [Figure 7] This is a plan view showing the hinged gate of the second embodiment in a state where the culvert is closed. [Figure 8] This is a plan view showing the hinged gate of the second embodiment in an open state. [Figure 9] FIG. 10 is an enlarged plan view showing the vicinity of a hinge that pivotally supports a left door body in the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0021] Hereinafter, a first embodiment of a hinged gate according to the present invention will be described with reference to the drawings.

[0022] First, a brief explanation of the floodplain 10 will be given. The floodplain 10 is a facility into which water from a river 100 flows when the river water level rises to a predetermined height, and which temporarily stores the water, and as shown in Figure 1, is composed of a levee 11 and a surrounding levee 12. In addition, an overflow levee 13 and a floodgate 14 for discharging water from the floodplain 10 into the river 100 are installed on the levee 11 between the floodplain 10 and the river 100.

[0023] The overflow levee 13 is intended to allow water from the river 100 to overflow into the retarding basin 10 before it overflows the levee 11 when the river water level rises, and has an opening that is lower than the levee 11. As shown in Figures 1 and 3, the overflow levee 13 in this first embodiment has a concave opening formed by left and right side portions 13a and a bottom surface 13b between the side portions 13a.

[0024] As shown in FIGS. 1 and 2, the bottom surface 13b is formed as the upper base of a substantially trapezoidal cross section, and the hinged gate 1A of the first embodiment is installed on the bottom surface 13b.

[0025] The hinged gate 1A of the first embodiment is a gate that is installed on an overflow levee 13 to adjust the height at which water from a river 100 overflows into a retarding basin 10. As shown in Figures 2 and 3, the hinged gate 1A has a plurality of hinges 2 fixed to the bottom surface 13b of the overflow levee 13, a door body 3 pivotally supported by these hinges 2 so as to be able to swing freely, a weight 4 provided at the lower end 33 of the door body 3, and a watertight member 5 that seals the gap between the overflow levee 13 and the lower end 33 of the door body 3. Each component will be described in detail below.

[0026] The hinges 2 are rotation shafts for pivotally supporting the door body 3 so that it can swing freely, and in this first embodiment, three hinges 2 are arranged side by side along the longitudinal direction on the bottom surface 13b of the overflow levee 13, as shown in Figures 2 and 3. The number of hinges 2 is not particularly limited, and may be selected appropriately depending on the width and weight of the door body 3, etc.

[0027] The gate body 3 swings on the overflow levee 13 to adjust the height (water level) at which the water of the river 100 overflows into the floodplain 10, blocking the water of the river 100 under normal circumstances, and allowing the water to overflow into the floodplain 10 when the water level rises and there is a risk of flooding (risk of water overflowing the levee 11).

[0028] 2 and 3, the door body 3 in this first embodiment is formed in a rectangular shape with a width sufficient to close the opening formed by the left and right side portions 13a and bottom surface 13b of the overflow dike 13. Watertight rubber 31 is attached to both left and right edges of the door body 3, maintaining watertightness between the side portions 13a of the overflow dike 13 and both left and right edges of the door body 3. The door body 3 is pivotally supported by hinges 2 near the lower end of a support surface 32 facing the retarding basin 10.

[0029] The weight 4 is a weight for determining the weight balance around the hinge 2, and in this first embodiment, is provided at the lower end 33 of the door body 3. The weight of the weight 4 in this first embodiment is adjusted to a weight that allows the door body 3 to stand in its initial position when no water pressure is applied to the door body 3 from the river 100 side, and to cause the door body 3 to tip over when the water level of the river rises and exceeds a predetermined water level higher than the hinge 2.

[0030] In this first embodiment, the door body 3 is configured to automatically swing (open and close the opening of the overflow dam 13) based on the weight balance between water pressure and the weight of the weight body 4, but this is not limited to this and the door body 3 may also be configured to be able to swing actively using the driving force of an electric motor, diesel engine, etc.

[0031] The watertight member 5 is a member for sealing the gap between the overflow dam 13, which changes as the door body 3 swings, and the lower end portion 33 of the door body 3. In this first embodiment, as shown in Figures 4 and 5, it has a flexible sheet 51 for sealing the gap and an anti-bending plate 52 fixed to the flat portion 515 of this flexible sheet 51.

[0032] The flexible sheet 51 is a sheet material for sealing the gap between the overflow levee 13 and the lower end 33 of the door body 3, and is made of a water-impermeable and flexible material such as rubber. In this first embodiment, the flexible sheet 51 is formed in a rectangular shape with a width equal to that of the door body 3. Furthermore, as shown in Figure 4, the vertical width of the flexible sheet 51 is formed to be larger than the gap dimension between the support surface 32 of the door body 3 and the overflow levee 13 when the gap is at its widest.

[0033] 2, 4, and 5, the flexible sheet 51 is bent so that the bent portion 511 protrudes toward the support end portion (the lower end portion 33 of the door body 3 in this first embodiment), which is the end portion supported by the hinge 2. In other words, by making the bent portion 511 protrude in the opposite direction to the hinge 2, the flexible sheet 51 is installed so as not to come into contact with the hinge 2.

[0034] The bent flexible sheet 51 has a lower end 512 fixed to the overflow levee 13 near the hinge 2, and an upper end 513 fixed to the door body 3 near the hinge 2. In this first embodiment, a flat fixing plate 514 having a length equivalent to the width of the door body 3 is placed from above the lower end 512 and the upper end 513, and the lower end 512 and the upper end 513 are fixed to the overflow levee 13 and the door body 3, respectively, with bolts or the like.

[0035] The flexible sheet 51 is not limited to rubber, but can be made of any material that is flexible and strong enough to withstand water pressure.

[0036] The bending prevention plate 52 is a flat plate that prevents the flexible sheet 51 from bending due to water pressure and coming into contact with the hinge 2, thereby interfering with the swinging movement of the door body 3. The bending prevention plate 52 in this first embodiment is formed in a rectangular shape with a width equal to that of the flexible sheet 51 and a vertical width that allows it to be fixed to the flat portion 515 between the bending portion 511 of the flexible sheet 51 and each of the fixed ends 512, 513.

[0037] In addition, the anti-bending plate 52 in this first embodiment is made of a metal plate such as a stainless steel plate or a steel plate, and is formed to a thickness that is strong enough to prevent it from bending even when subjected to water pressure when the river water level exceeds the height of the door body 3.

[0038] As shown in Figures 2, 4 and 5, this bending prevention plate 52 is fixed to the flat portion 515 between the bending portion 511 of the flexible sheet 51 and each fixed end portion 512, 513, and in this first embodiment, in order to reliably prevent bending of the flexible sheet 51, the bending prevention plate 52 is fixed to both the front and back sides of the flat portion 515 of the flexible sheet 51.

[0039] In addition, the anti-bending plates 52 are not limited to a configuration in which one plate is fixed to each of the front and back surfaces of the flexible sheet 51, and the number of plates fixed to each surface may be selected appropriately depending on the strength of the flexible sheet 51 and the expected water pressure.

[0040] Next, the function of each component of the hinged gate 1A of the first embodiment will be described.

[0041] When the river water level is within a normal range where there is no risk of flooding and no water pressure is applied to the gate body 3, the gate body 3 is raised to its initial position due to the weight balance with the weight body 4, as shown in Figures 2 and 4. At this time, the distance between the support surface 32 of the gate body 3 and the overflow levee 13 is the shortest within the swing range of the gate body 3.

[0042] The watertight member 5 is bent so as to protrude toward the lower end 33 of the door body 3. The bending angle at this time is acute because of the close distance to the overflow levee 13, but the flexible sheet 51 can bend without interfering with the erection movement of the door body 3 due to its own flexibility.

[0043] When the river water level rises, water pressure is applied to the gate body 3 from the river 100 side, and water flows into the support surface 32 side of the gate body 3 through the gap between the overflow levee 13 and the lower end 33 of the gate body 3 .

[0044] The flexible sheet 51, due to its own impermeability, seals the gap between the door body 3 and the overflow levee 13, preventing water leakage into the retarding basin 10. In the first embodiment, the lower end 512 and upper end 513 of the flexible sheet 51 are firmly fixed by fixing plates 514, so that water leakage from the fixed parts is also reliably prevented.

[0045] Furthermore, the bending prevention plate 52 prevents each flat portion 515 of the flexible sheet 51 from bending when the watertight member 5 is subjected to water pressure from the river 100 side. This allows the watertight member 5 to maintain a state in which it protrudes toward the support end (the lower end portion 33 of the door body 3 in this first embodiment), and even when subjected to water pressure from the river 100 side, it does not bend toward the hinge 2 side, preventing it from coming into contact with the hinge 2.

[0046] When the water level on the river 100 side rises further and exceeds a predetermined water level, the gate body 3 automatically falls toward the floodplain 10 side due to the water pressure from the river 100 side. When the gate body 3 falls, the top of the gate body 3 becomes lower than the river water level, and the water of the river 100 flows into the floodplain 10. As a result, the hinged gate 1A of the first embodiment can allow the water of the river 100 to flow into the floodplain 10 before it overflows the levee 11, thereby lowering the river water level and preventing flooding.

[0047] As described above, the watertight member 5 is maintained in a state of protruding toward the support end side without contacting the hinge 2, and therefore does not prevent the door body 3 from automatically tipping over due to weight balance.

[0048] Furthermore, the tipping over of the door body 3 increases the distance between the support surface 32 of the door body 3 and the overflow levee 13. As shown in Figure 5, the watertight member 5 expands in the vertical direction according to the distance between the support surface 32 and the overflow levee 13, and can continue to seal the gap between the door body 3 and the overflow levee 13.

[0049] When the water level in the floodplain 10 rises, water pressure is also applied to the surface of the gate body 3 facing the floodplain 10 (the support surface 32 of the gate body 3 in this first embodiment). This water pressure from the floodplain 10 side acts as a force in the direction of pushing the gate body 3 into an upright position. Therefore, when the water level on the floodplain 10 side rises above a predetermined water level, the gate body 3 automatically returns to an upright position.

[0050] As shown in FIG. 5, the watertight member 5 is kept out of contact with the hinge 2 even when the door body 3 falls over, and does not hinder the door body 3 from automatically returning to the upright position.

[0051] After the gate body 3 returns to its upright position, if the river water level drops below the water level on the floodplain 10 side, the water on the floodplain 10 side will try to flow back toward the river 100 through the gap between the overflow levee 13 and the lower end 33 of the gate body 3. Even in this case, the watertight member 5 seals the gap between the gate body 3 and the overflow levee 13, preventing water leakage from the floodplain 10 side to the river 100 side.

[0052] According to the first embodiment described above, the following advantageous effects can be achieved. 1. The watertight member 5 prevents water from leaking from the vicinity of the hinge 2 into the floodplain 10 until the door body 3 is overturned due to the water pressure received from the river 100 side, thereby preventing more water than necessary from flowing into the floodplain 10. 2. The flexible sheet 51 is bent up and down so that the bent portion 511 protrudes toward the support end in the opposite direction to the hinge 2, and the anti-bending plate 52 prevents the flat portion 515 from bending even when subjected to water pressure, so the watertight member 5 does not come into contact with the hinge 2 and does not interfere with the swinging movement of the door body 3. 3. The watertight member 5 can also prevent water leakage from the floodplain 10 to the river 100, so water can continue to be stored in the floodplain 10 until the river water level drops.

[0053] Next, a second embodiment of the hinged gate according to the present invention will be described with reference to the drawings. Note that the same or corresponding components as those described in the first embodiment will be assigned the same reference numerals and will not be described again.

[0054] The hinged gate 1B of the second embodiment is a gate, such as a miter gate, that is installed so as to be able to open to both the left and right at the exit 15a of the sluice gate 15. First, a brief description will be given of the sluice gate 15 in which the hinged gate 1B is installed.

[0055] As shown in Figure 6, the sluice gate 15 is a waterway built to cross the levee 11. Under normal circumstances, it drains rainwater and other water from the land inside the levee 200 into the river 100, and is a facility that prevents backflow from the river 100 into the land inside the levee 200 in abnormal situations when the river water level rises and there is a risk of flooding.

[0056] The outlet 15a of the sluice gate 15 in this second embodiment is the portion that serves as the door abutment surface of the hinged gate 1B, and has a rectangular opening when viewed from the front (when viewed from the river 100 side toward the bank land 200), and is formed in a roughly triangular shape protruding toward the river 100 side when viewed from above. In addition, a concave drainage channel 16 with an open top is formed on the river 100 side of the outlet 15a.

[0057] The outlet 15a of the sluice gate 15 is not limited to being formed in a substantially triangular shape in plan view, but may be formed as a flat doorstop surface that is linear in plan view. The drainage channel 16 is also not limited to being concave, but may be formed in a rectangular shape with a top.

[0058] As shown in Figures 7 and 8, the hinged gate 1B of this second embodiment has multiple hinges 2 provided on both left and right wall surfaces 16a, 16b of the drainage channel 16, a pair of left and right door bodies 3, 3 pivotally supported by the left and right hinges 2, and a watertight member 5 that ensures watertightness near the hinges 2.

[0059] In this second embodiment, the hinge 2 is used to pivotally support a pair of left and right door bodies 3 so that they can be opened in both directions, and multiple hinges 2 are arranged side by side in the vertical direction on both left and right wall surfaces 16a, 16b of the drainage channel 16 on the river 100 side of the outlet 15a of the sluice gate 15.

[0060] The pair of left and right door bodies 3, 3 are doors for opening and closing the outlet 15a of the sluice gate 15, and are formed in a rectangular shape with a vertical width sufficient to close the outlet 15a of the sluice gate 15. The door bodies 3 in this second embodiment are formed at an angle, not perpendicular to the support surface 32, etc., so that when they abut along the outlet 15a of the sluice gate 15, which is approximately triangular in plan view, their respective tip ends come into surface contact with each other, ensuring watertightness.

[0061] Furthermore, each door body 3, 3 is pivotally supported by a hinge 2 near the wall-side ends 34a, 34b of the support surface 32 facing the river 100. In other words, the pair of left and right door bodies 3, 3 are installed near the wall-side ends 34a, 34b of the support surface 32 so that the outlet 15a of the sluice gate 15 can be opened and closed in both directions, specifically, from a closed state in which the tips are in contact with each other as shown in Figure 7, to an open state in which the tips are inclined slightly inward toward the river 100 as shown in Figure 8.

[0062] The watertight member 5 in this second embodiment is intended to seal the gaps between the left and right side walls 16a, 16b and the left and right ends of the door body 3, and as shown in Figure 9, has a flexible sheet 51 and a bending prevention plate 52, similar to the first embodiment.

[0063] The flexible sheet 51 in this second embodiment is formed in a rectangular shape with a vertical width equal to that of the door body 3 and is bent to the left and right, and as shown in Figure 9, one of the left and right fixed ends 516a, 516b is fixed to the side walls 16a, 16b near the hinge 2, and the other fixed end 516a, 516b is fixed to the support surface 32 of the door body 3 near the hinge 2.

[0064] At this time, the bent portion 511 is bent so as to protrude toward the support end (in this second embodiment, the left end 516a or the right end 516b of the door body 3) so as not to come into contact with the hinge 2 and interfere with the swinging movement of the door body 3.

[0065] The bending prevention plate 52 in the second embodiment is fixed to the surface of the flexible sheet 51 on the river 100 side of the flat portion 515 between the bending portion 511 and the left and right fixed ends 516a, 516b.

[0066] In this second embodiment, the anti-bending plate 52 is fixed to only one side of the flat portion 515 facing the river 100, but this is not limited to this and it may be fixed to both sides or only one side facing the embankment 200.

[0067] Next, the operation of each component of the hinged gate 1B of the second embodiment will be described.

[0068] In normal times, in order to drain rainwater and the like from the bank area 200 toward the river 100, the tip of each gate body 3 is directed toward the river 100 to open the outlet 15a of the sluice gate 15, as shown in FIG.

[0069] When the river water level rises, the water in the river 100 tries to flow back into the levee area 200. At this time, the gate body 3 is subjected to water pressure in the direction from the river 100 toward the levee area 200. As shown in Figure 8, when the gate body 3 is open, it is tilted slightly inward relative to each other, so it is susceptible to water pressure from the river 100 side. Then, due to this water pressure, each gate body 3, 3 closes the outlet 15a of the sluice gate 15, as shown in Figure 7.

[0070] The watertight member 5 protrudes toward the support end (in this second embodiment, the left end 516a or the right end 516b of the door body 3) so as not to come into contact with the hinge 2, and since the flexible sheet 51 is configured to be freely bendable, it does not interfere with the swinging movement of the door body 3 when closing the outlet 15a of the sluice gate 15.

[0071] Furthermore, after the outlet 15a of the sluice gate 15 is closed, the watertight member 5 seals the gaps between the left and right side walls 16a, 16b and the wall side ends 34a, 34b of the door body 3. Specifically, it seals the gap between the left side wall 16a of the drainage channel 16 and the left wall side end 34a of the left door body 3, and the gap between the right side wall 16b of the drainage channel 16 and the right wall side end 34b of the right door body 3. This allows the watertight member 5 to prevent water leakage from near the hinge 2 to the inside of the bank 200.

[0072] According to the second embodiment as described above, the same effects as those of the first embodiment are achieved, and when the river water level rises, the door body 3 closes the outlet 15a of the sluice gate 15, and the watertight member 5 seals the gap between the door body 3 and both the left and right side walls 16a, 16b near the hinge 2, thereby reliably preventing backflow from the river 100 side to the inside of the bank 200 side. In addition, the watertight member 5 does not interfere with the swinging movement of the door body 3.

[0073] The hinged gate according to the present invention is not limited to the above-described embodiments and can be modified as appropriate. For example, a drainage pump or other facility may be installed on the levee 11 to release water stored in the retarding basin 10 into the river 100. [Explanation of symbols]

[0074] 1A, 1B hinged gate 2 hinges 3 Door body 4 Pyramid 5 Watertight materials 10 Floodplain 11 Embankment 12 Surrounding embankment 13 Overflow levee 13a Side 13b Bottom 14 Floodgate 15 Floodgate 15a Exit 16 Drainage Channel 16a Left side wall 16b Right side wall 31 Watertight rubber 32 Support surface 33 Lower end 34a,34b Wall side end 51 Flexible sheet 52 Anti-bending plate 511 Bend 512 Lower end 513 Upper end 514 Fixing plate 515 Flat area 516a Left fixed end 516b Right fixed end 100 Rivers 200 Inland land

Claims

1. A hinged gate installed on an overflow levee that opens at a step lower than the levee and allows river water to overflow into a retarding basin located inside the levee. a plurality of hinges arranged in parallel along the longitudinal direction on the bottom surface of the overflow bank; a door body formed in a rectangular shape with a width sufficient to close the opening of the overflow levee, and pivotally supported by the hinge near the lower end of the support surface facing the retarding basin; a watertight member that seals the gap between the overflow bank and the lower end of the door body; It has The watertight member is a flexible sheet formed in a rectangular shape with a width equal to that of the door body, bent vertically, and having a lower end fixed to the overflow levee near the hinge and an upper end fixed to the door body near the hinge; a flat anti-bending plate fixed to a flat portion between the bent portion of the flexible sheet and the lower end and the upper end, The hinged gate.

2. A hinged gate that can be opened both left and right at the exit of a rectangular sluice gate, A plurality of hinges arranged in parallel in the vertical direction on both left and right wall surfaces on the river side of the outlet of the sluice gate; A pair of left and right door bodies formed in a rectangular shape with a vertical width that can close the outlet of the sluice gate, and each of which is pivotally supported by the hinge near the wall side end of the support surface facing the river side; Watertight members that seal gaps between the left and right side walls and the left and right ends of the door body; It has The watertight member is a flexible sheet formed in a rectangular shape with a vertical width equal to that of the door body, bent left and right, one fixed end being fixed to the side wall near the hinge and the other fixed end being fixed to the door body near the hinge; a flat anti-bending plate fixed to a flat portion between the bent portion and each fixed end of the flexible sheet; The hinged gate.

3. 3. The hinged gate according to claim 1, wherein the anti-bending plates are fixed to both the front and back surfaces of the flat portion of the flexible sheet.

4. 3. A hinged gate according to claim 1, wherein the watertight member is positioned closer to the support end of the door body than the hinge, and the bent portion of the watertight member is bent so as to protrude toward the support end of the door body.

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