Automatic tilting gate, method for adjusting the tilting force of an automatic tilting gate

Abstract

It opens and closes the gate without requiring a power source. [Solution] An overflow gate 6 is installed between a river and a regulating reservoir. The overflow gate 6 comprises a main body 10 and a gate body 20 that is rotatably supported on the main body 10 via a pivot 18 and displaceable between an upright position P1 for closing the gate and a collapsed position P2 for opening the gate. The gate body 20 is provided with a weight portion 24 at its lower end in the upright position P1 and is supported on the main body 10 via the pivot 18 at a position between the middle and lower end in the vertical direction. The weight of the weight portion 24 and the center of gravity of the gate body 20 are set so that it maintains the upright position P1 until the water level on the river side reaches a set water level, and then displaces to the collapsed position P2 when the water level exceeds the set water level.

Description

Technical Field

[0001] The present invention relates to an automatic overturning gate used for river equipment and the like. Background Art

[0002] Conventionally, there has been known flood control equipment in which a regulating pond is provided at a position adjacent to a river, and when the water volume increases rapidly due to heavy rain or the like, water exceeding the flow capacity of the river is temporarily diverted into the regulating pond to prevent river flooding. In this flood control equipment, an automatic overturning gate is installed between the river and the regulating pond. The automatic overturning gate is a piece of river equipment that normally restricts overturning to keep the gate closed, and when the water level of the river reaches a threshold value, the overturning restriction is released, and the gate body is automatically overturned by the water pressure of the river (for example, Patent Document 1). That is, when the water level of the river reaches the threshold value, the gate body overturns to open the gate, thereby allowing water to flow from the river into the regulating pond, thus preventing river flooding. Prior Art Documents Patent Documents

[0003] Patent Document 1 Japanese Utility Model Laid-Open Publication No. Sho 60-154427 Summary of the Invention Problems to be Solved by the Invention

[0004] However, in a conventional automatic overturning gate as disclosed in Patent Document 1, although the overturning of the gate body itself is automatically performed by water pressure, returning the gate body to the upright position requires power from a motor, a hydraulic cylinder, or the like. Therefore, construction costs tend to increase, and the management burden such as regular maintenance of the drive system is also heavy.

[0005] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an automatic overturning gate capable of opening and closing the gate without requiring a power source, and a method for adjusting the overturning force of the automatic overturning gate. Means for Solving the Problems

[0006] [Aspect 1] To solve the above problems, an automatic tilting gate according to one aspect of the present invention is provided between an upstream element and a downstream element, and is an automatic tilting gate that opens and closes the gate according to the water level of the upstream element, comprising a frame and a door body that is rotatably supported on the frame via a pivot and displaces between an upright position for closing the gate and a tilted position for opening the gate, wherein the door body comprises a door body and a weight portion positioned at the lower end of the door body in the upright position, and is supported on the frame via the pivot at a position between the middle and lower end of the door body in the vertical direction, and until the water level of the upstream element reaches a set water level, The gate maintains an upright position, and when the water level of the upstream element exceeds the set water level, the water pressure displaces it from the upright position to the downed position, allowing water to flow from the upstream element to the downstream element. At the same time, when the gate is in the downed position, if the water level difference between the upstream and downstream elements becomes smaller than a predetermined water level difference, the weight of the counterweight is set such that it rotates around the pivot by its own weight and changes back to the upright position. Furthermore, the center of gravity of the gate is configured to always be located on the side of the upstream element with respect to the vertical line passing through the pivot, throughout all positions from the upright position to the downed position.

[0007] The automatic tilting gate with the above configuration utilizes and applies the principle of a roly-poly toy: when a force is applied to the top, it tilts to the opposite side of the applied force, and when the force is removed, it returns to its original position. Specifically, the gate body maintains an upright position until the water level in the upstream element reaches a set water level. When the water level in the upstream element exceeds the set water level, the water pressure displaces the gate body from an upright position to a tilted position. Therefore, it is possible to open the gate according to the water level in the upstream element without using a dedicated power source.

[0008] Furthermore, in this automatic tilting gate, when the water level difference between the upstream element and the downstream element becomes smaller than a predetermined water level difference, the gate body is displaced from a tilted position to an upright position by at least the weight of the counterweight. Therefore, it is possible to close the gate without using a dedicated power source.

[0009] Furthermore, with this configuration, in all positions from the upright position to the reclined position, the center of gravity of the gate body is located on the upstream element side with respect to the vertical line passing through the pivot. Therefore, a force (uprighting moment) that returns the gate body to the upright position always acts on it, regardless of its position. As a result, as the water level in the upstream element decreases, it becomes possible to reliably return the gate body to the upright position, that is, to reliably close the gate.

[0010] [Aspect 2] In the automatic tilting gate of embodiment 1, the gate is further configured to include a tilting force generating mechanism that generates a tilting force for the gate body to be displaced from the upright position to the tilted position.

[0011] This configuration ensures that the door body is reliably generated to generate the overturning force necessary to displace it from the upright position to the downed position.

[0012] [Aspect 3] In the automatic tilting gate of embodiment 2, the tilting force generating mechanism is configured to have a tilting force adjustment unit that can adjust the tilting force acting on the gate body.

[0013] This configuration allows for adjustment of the tipping force acting on the door body.

[0014] [Aspect 4] In the automatic tilting gate of embodiment 3, the tilting force adjustment unit further comprises a watertight portion interposed between the lower end of the gate body and the main body, which adjusts the range of water movement through the underside of the gate body from the upstream element side to the downstream element side, and the watertight portion is configured to adjust the range of water movement through the underside of the gate body from the start of displacement from the upright position until the gate body is displaced to a predetermined angle.

[0015] With this configuration, the water movement area from the upstream element to the downstream element, passing under the gate body, is regulated by the watertight section, thereby adjusting the upright moment acting on the gate body due to the water movement. As a result, when the water level in the upstream element reaches the set water level, the gate body can be more reliably displaced from an upright position to a reclined position. In other words, the watertight section can adjust the buoyancy between the upstream and downstream elements at the lower end of the gate body. As a result, a rotational moment around the pivot can be efficiently applied to the gate body.

[0016] [Aspect 5] In the automatic tilting gate of embodiment 4, at least the portion of the lower end of the gate body that is on the downstream side of the pivot has an arc shape in a cross-sectional view perpendicular to the pivot.

[0017] This configuration prevents the lower end of the door from interfering with the building structure when the door changes position between its upright and reclined positions.

[0018] [Aspect 6] In the automatic tilting gate of embodiment 3, the tilting force adjustment unit is configured to adjust the tilting force acting on the door body by adjusting at least one of the relative position of the weight portion with respect to the door body, the shape of the weight portion, and the weight of the weight portion.

[0019] With this configuration, the tipping force acting on the door body can be adjusted by adjusting at least one of the following: the relative position of the weight portion with respect to the door body, the shape of the weight portion, and the weight of the weight portion.

[0020] [Aspect 7] In the automatic tilting gate of embodiment 2, the tilting force generating mechanism is configured to have an auxiliary tilting force generating unit that accepts the intrusion of water from the upstream element and generates an auxiliary tilting force for the gate body to be displaced from the upright position to the tilted position.

[0021] According to this configuration, an auxiliary overturning force for displacing the door body from the upright posture to the fallen posture can be generated by receiving water intrusion from the upstream element. Specifically, this auxiliary overturning force generates a moment in the direction that causes the door body to fall. For this reason, it is possible to appropriately apply a force for overturning the door body to the door body.

[0022] [Aspect 8] In the automatic overturning gate according to Aspect 7, the auxiliary overturning force generating portion may include a water intake portion that is disposed on the door body, includes a water intake that receives water from the upstream element portion when the water level of the upstream element portion reaches the set water level, and causes the force received from the water intake to displace the door body to the fallen posture to act on the door body.

[0023] According to this configuration, when the water level of the upstream element portion exceeds the set water level, an additional force for displacing the door body to the fallen posture is exerted by the inflow water from the water intake. In other words, the force acting on the door body by the inflow water from the water intake serves as a trigger, making it possible to reliably and promptly displace the door body from the upright posture to the fallen posture.

[0024] [Aspect 9] In the automatic overturning gate according to Aspect 8, the water intake portion may be configured to include a water catching container that is installed on a wall surface of the door body on the downstream element portion side and receives water flowing in from the water intake.

[0025] In this configuration, water flowing in from the water intake accumulates in the water catching container, and the load thereof generates a moment that overturns the door body. For this reason, it is possible to appropriately apply the force for overturning the door body by the inflow water from the water intake to the door body.

[0026] [Aspect 10] In the automatic overturning gate according to Aspect 9, the water catching container may be configured to include a drain hole capable of draining water in the water catching container when the door body is in the upright posture.

[0027] This configuration prevents water from remaining in the water collection container or rainwater from accumulating when the door is in an upright position.

[0028] [Aspect 11] In the automatic tilting gate of embodiment 8, the water intake section may be configured to include a guide pipe that guides the water received from the water intake between the lower end of the gate body and the main body.

[0029] In this configuration, when the water level in the upstream element exceeds the set water level, water flows in from the intake and is introduced between the lower end of the gate and the main body through the guide pipe. The introduced water provides buoyancy to the gate. This buoyancy generates a moment that causes the gate to collapse. Therefore, even with this configuration, it is possible to appropriately apply a force that causes the gate to collapse to the gate by the water flowing in from the intake.

[0030] [Aspect 12] In the automatic tilting gate of embodiments 1 to 11, the upstream element is a river, the downstream element is a regulating reservoir provided adjacent to the river, the structure has a trapezoidal cross-section having a pair of sloping surfaces provided on the river side and the regulating reservoir side, respectively, and an upper surface positioned between the pair of sloping surfaces, and includes an overflow weir formed in the shape of a recess on the upper surface, the gate body is positioned within the recessed overflow weir, and in the tilted position, the wall surface of the gate body is stored within the recess so as to connect with the upper surface.

[0031] In this configuration, the gate is closed by maintaining the gate body in an upright position until the river water level reaches the set water level. When the river water level exceeds the set water level, the water pressure automatically displaces the gate body from the upright position to a reclined position, opening the gate. Therefore, when the water volume increases rapidly due to heavy rain, etc., it is possible to quickly release the river water into the regulating reservoir and prevent river flooding. In this case, when the gate body is in the reclined position, it is stored within the recessed overflow weir section, and the wall surface of the gate body is connected to the upper surface of the overflow weir section, so the gate body is less likely to obstruct the flow of water from the river to the regulating reservoir. Therefore, the inflow of water from the river to the regulating reservoir is made smoother. In addition, when the river water level drops, the gate body can be automatically returned to the upright position and the gate can be closed again.

[0032] [Aspect 13] A method for adjusting the tilting force of an automatic tilting gate according to another aspect of the present invention is a method for adjusting the tilting force of an automatic tilting gate provided between an upstream element and a downstream element, which opens and closes the gate according to the water level of the upstream element, wherein the automatic tilting gate is prepared by providing a gate body having a frame and a gate body and a weight portion disposed at the lower end of the gate body in an upright position, and the gate body is rotatably supported on the frame via the pivot at a position between the middle and lower end of the gate body in the vertical direction so that the gate body can be displaced between an upright position that closes the gate and a tilted position that opens the gate, and until the water level of the upstream element reaches a set water level The gate maintains the upright position, and when the water level of the upstream element exceeds the set water level, it is displaced from the upright position to the downed position by water pressure, allowing water to flow from the upstream element to the downstream element. In the downed position, when the water level difference between the upstream and downstream elements becomes smaller than a predetermined water level difference, the weight of the counterweight is set such that it rotates around the pivot by its own weight and changes back to the upright position. The center of gravity of the gate is set so that, in all positions from the upright position to the downed position, it is always located on the side of the upstream element with respect to the vertical line passing through the pivot.

[0033] The method for adjusting the tipping force of the automatic tilting gate described above utilizes and applies the principle of a roly-poly toy, which tips over in the opposite direction when force is applied to the top and returns to its original position when the force is removed. Specifically, the gate body maintains an upright position until the water level in the upstream element reaches a set water level. When the water level in the upstream element exceeds the set water level, the water pressure displaces the gate body from an upright position to a tilted position. As a result, the gate can be opened according to the water level in the upstream element without the need for a dedicated power source.

[0034] Furthermore, in this automatic tilting gate tilting force adjustment method, when the water level difference between the upstream element and the downstream element becomes smaller than a predetermined water level difference, the gate body is displaced from a tilted position to an upright position by at least the weight of the counterweight. As a result, it is possible to close the gate without using a dedicated power source.

[0035] Furthermore, with this method, in all positions from the upright position to the reclined position, the center of gravity of the gate body is located on the upstream element side with respect to the vertical line passing through the pivot. Therefore, a force (uprighting moment) that returns the gate body to the upright position always acts on it, regardless of its position. As a result, as the water level in the upstream element decreases, it becomes possible to reliably return the gate body to the upright position, that is, to reliably close the gate.

[0036] [Aspect 14] The method for adjusting the tipping force of an automatic tipping gate according to embodiment 13 further comprises adjusting the tipping force acting on the door body by adjusting at least one of the relative position of the weight portion with respect to the door body, the shape of the weight portion, and the weight.

[0037] According to this method, the tipping force acting on the door body can be adjusted by adjusting at least one of the relative position of the weight portion with respect to the door body, the shape of the weight portion, and the weight of the weight portion. [Effects of the Invention]

[0038] As described above, the automatic tilting gate of the present invention makes it possible to open and close the gate without requiring a power source. [Brief explanation of the drawing]

[0039] [Figure 1] This is a schematic diagram showing a flood control facility to which the automatic tilting gate of the present invention is applied. [Figure 2] This is a front view of the overflow gate (automatic tilting gate) of the first embodiment, as seen from the regulating reservoir side. [Figure 3] This is a cross-sectional view of the overflow gate (section III-III in Figure 2). [Figure 4] Figure 3 is an enlarged view of the door body. [Figure 5] This is a cross-sectional view of the main part of the overflow gate, showing the pivot point (axis) of the gate body when it is collapsed. [Figure 6] This is a diagram illustrating the operation of the overflow gate. [Figure 7] This is a diagram illustrating the operation of the overflow gate. [Figure 8] This is a front view of the overflow gate (automatic tilting gate) of the second embodiment, as seen from the regulating reservoir side. [Figure 9] This is a cross-sectional view of the overflow gate (cross-sectional view along line IX-IX in Figure 8). [Figure 10] Figure 9 is an enlarged view of the door body. [Figure 11] This is a diagram illustrating the operation of the overflow gate. [Figure 12] This is a diagram illustrating the operation of the overflow gate. [Figure 13] This is a diagram illustrating the effectiveness of the water intake section (a graph showing the relationship between water level and tipping moment). [Figure 14] This is a cross-sectional view of the main part of the overflow gate according to a modified example. [Figure 15] This is a cross-sectional view of the main part of the overflow gate according to a modified example. [Modes for carrying out the invention]

[0040] Embodiments of the present invention will be described in detail below with reference to the drawings.

[0041] [Configuration of Flood Control Facility 1] Figure 1 is a schematic diagram showing a flood control facility 1 to which the automatic tilting gate according to the present invention is applied. The flood control facility 1 is a facility that prevents river flooding by installing a retention pond adjacent to the river and diverting water that exceeds the river's flow capacity into the retention pond during heavy rains, etc. The retention pond is formed by being surrounded by an encircling embankment 3 that is connected to the river embankment 2 and acts as a partition from the river, and a surrounding embankment 4 that is connected to the encircling embankment 3.

[0042] The surrounding embankment 3 is equipped with an overflow gate 6 on the upstream side of the regulating reservoir and a drainage gate 5 on the downstream side, separated by a predetermined distance. The overflow gate 6 is an automatic tilting gate according to the present invention. When the river water level is at the normal level, the gate is closed by the gate body 20. When the river water level rises and reaches the set water level, the water pressure causes the gate body 20 to tilt and open the gate. The tilting and returning of the gate body 20 is configured to be done without the use of a power source. This point will be described in detail later.

[0043] The drainage gate 5 consists of an electrically operated sliding gate, for example, in which the gate body 5a is raised and lowered to open and close the gate. The drainage gate 5 is opened and closed manually and is normally closed. In other words, when the river water level rises and reaches the set water level, the overflow gate 6 is opened and the river water is introduced into the regulating reservoir and stored. After the river water level returns to the normal level, the drainage gate 5 is opened at an appropriate time in preparation for the next flood, and the water stored in the regulating reservoir is released into the river. The water stored in the regulating reservoir may be used for other purposes.

[0044] [First embodiment of the overflow gate 6 (automatic tilting gate)] Figure 2 is a front view of the overflow gate 6 as seen from the regulating reservoir side, and Figure 3 is a cross-sectional view of the overflow gate 6 (cross-sectional view along line III-III in Figure 2). Figure 4 is an enlarged view of the gate body 20 in Figure 3.

[0045] As shown in Figures 2 to 4, the overflow gate 6 comprises a main body 10 and a door body 20 that is rotatably supported by the main body 10.

[0046] The main structure 10 is integrally constructed with the surrounding embankment 3. That is, the surrounding embankment 3 has a U-shaped open section (see Figure 2) in the middle of its longitudinal direction, and the entire wall surface of this U-shaped open section corresponds to the main structure 10. The lower part of the main structure 10 extends in the direction of alignment between the river and the regulating reservoir (left-right direction in Figure 3). For convenience, in the following explanation, this direction of alignment between the river and the regulating reservoir (left-right direction in Figure 3) will be referred to as the X direction, and the river side will be referred to as the +X side and the regulating reservoir side as the -X side.

[0047] As shown in Figure 3, the lower part of the structure 10 forms an overflow weir section 11 with a trapezoidal cross-section, comprising a pair of sloping sections 12 on the river side and the reservoir side, and a flat section 14 (upper surface) between the two sloping sections 12. The sloping section 12 on the river side is a downward sloping surface from the flat section 14 toward the river, and the sloping section 12 on the reservoir side is a downward sloping surface from the flat section 14 toward the reservoir. Note that the upper surface is not necessarily limited to being a flat surface.

[0048] In the planar section 14 of the overflow weir section 11 (body 10), a rectangular recess 15 is formed in plan view at a position corresponding to the surrounding embankment 3. The gate body 20 is rotatably positioned within this recess 15 via a pivot 18. Specifically, the gate body 20 is rotatably supported across an upright position P1 (solid line position in Figure 3) where the gate is closed and a lowered position P2 (dash-dot line position in Figure 3) where the gate is open. In the following description, the position and direction of the gate body 20 are based on the upright position P1 unless otherwise specified.

[0049] The gate body 20 has a rectangular shape when viewed from the front, and in this example, it is an elongated rectangle in the width direction, i.e., in the longitudinal direction of the surrounding embankment 3. The gate body 20 is made of steel and comprises a gate body 22 that extends vertically and has a constant thickness in the X direction, and a weight portion 24 integrally provided at the lower end of the gate body 22. The lower end of the gate body 20 extends slightly to the -X side, and as a result, the gate body 20 has an L-shape in cross-section, as shown in Figure 4.

[0050] In Figure 4 and other diagrams, the door body 20 is depicted as solid for convenience, but in reality, the door body 22 is formed from a steel frame and steel plates, with hollow sections formed in various places to achieve the necessary weight reduction. In this embodiment, the lower surface of the weight portion 24 is a curved surface that is convex downwards. A sealing member (not shown) is provided around the door body 22 to prevent water from flowing through the gap between it and the building structure 10.

[0051] The door body 20 is rotatably supported by the building structure 10 via a pivot 18 at a position between its vertical middle section and its lower end. More specifically, a pair of support brackets 16 are positioned on both sides of the door body 20 in the width direction at a position closer to the +X side on the inner bottom surface of the recess 15. Each support bracket 16 is fixed to the building structure 10. The upper portion of the support bracket 16 has a pair of plate-shaped parts (plate-like sections) and extends toward the river side, as shown in Figure 5. On the other hand, a pair of mounting brackets 22a are provided on the -X side wall surface of the lower end of the door body 22, and each mounting bracket 22a is inserted between the pair of plate-like sections of the support bracket 16. Holes are formed in this pair of plate-like sections and the mounting brackets 22a, and the pivot 18 is inserted into each hole, so that the door body 20 is rotatably supported by the support bracket 16 via the pivot 18. As a result, the door body 20 is rotatably supported on the main body 10 via the pivot 18 at a position directly above the weight portion 24.

[0052] The gate body 20 is maintained in an upright position P1 mainly by the moment around the pivot 18 (upright moment M1) caused by the weight section 24 until the water level on the river side reaches the set water level. When the water level on the river side exceeds the set water level and the rotational moment around the pivot 18 (overturning moment M2) due to the water pressure becomes greater than the upright moment M1, the weight of the weight section 24 is set and the position of the center of gravity G of the gate body 20 is set so that it is displaced from the upright position P1 to the overturned position P2.

[0053] More specifically, as shown in Figures 4 and 5, the gate body 20 is configured such that, in all positions from the upright position P1 to the collapsed position P2, the position of its center of gravity G is located on the +X side, i.e., the river side, relative to the vertical line L1 passing through the center of the pivot 18. In this example, in the upright position P1 and the collapsed position P2, the center of gravity G of the gate body 20 is set slightly on the +X side of the vertical line L1. Also, in the upright position P1, the center of gravity G of the gate body 20 is positioned slightly below the pivot 18. As a result, the gate body 20 is configured to always have an upright moment M1 acting on it, and in an unloaded state where no water pressure acts from the river side, i.e., when no overturning moment M2 due to water pressure acts, it is maintained in the upright position P1, where the weight portion 24 abuts against the upright stopper 30 provided on the inner surface of the support bracket 16.

[0054] On the other hand, a tilt stopper 32 (Figure 3) is provided on the inner wall surface of the recess 15 of the building structure 10 in the -X axis. The tilt stopper 32 contacts the door body 22 when the door body 20 is displaced to the tilted position P2, thereby restricting the displacement of the door body 20. As a result, when the door body 20 is displaced to the tilted position P2, the door body 20 is stored in the recess 15 with the flat surface 14 of the overflow weir 11 and the wall surface on the +X side of the door body 20 becoming substantially flush, as shown by the dashed line in Figure 3. Note that, as shown in Figure 5, the upper surface of the support bracket 16 may also function as a tilt stopper.

[0055] In Figure 4, reference numeral 36 denotes a debris inflow prevention cover, which extends across the width of the recess 15. The debris inflow prevention cover 36 is positioned on the upper part of the river-side wall of the recess 15, preventing dust and debris from flowing into the gap between the upright gate body 20 and the wall of the recess 15 from the river side, and also preventing debris from entering the recess 15 when the gate body 20 is displaced to a collapsed position P2.

[0056] On the other hand, the watertight rubber 34 is positioned on the inner bottom surface of the recess 15. The watertight rubber 34 has the function of restricting the movement of water from the river side to the regulating reservoir side via the underside of the gate body 20. Specifically, the lower end of the gate body 20 has an arc-shaped lower surface 24a centered on the pivot 18, and the watertight rubber 34 is in close contact with the lower surface 24a of the gate body 20 until the gate body 20 is displaced to a predetermined angle from the upright position P1. As a result, the inflow of water from the river side to the regulating reservoir side via the underside of the gate body 20 is restricted until the gate body 20 is displaced to a predetermined angle. Note that the position of the watertight rubber 34 is not limited to the position shown in Figure 4, and the watertight rubber 34 only needs to be in a position that contacts the underside of the weight portion 24 in the upright position P1, and may be positioned from the upstream surface position of the weight portion 24, including the upright stopper 30, or in a position close to the upright stopper 30.

[0057] [Explanation of operation of overflow gate 6] Figures 6 and 7 are diagrams illustrating the operation of the overflow gate 6.

[0058] When the river water level is at the normal level, as described above, an upright moment M1 mainly due to the weight section 24 acts on the gate body 20, and the gate body 20 is maintained in the upright position P1, thereby closing the overflow gate 6 (state shown in Figure 4).

[0059] As the water level on the river side rises (Figure 6(a)), the overturning moment M2 acting on the gate body 20 gradually increases. When the water level on the river side reaches the set water level, the overturning moment M2 becomes larger than the upright moment M1, and as a result, the gate body 20 is displaced from an upright position P1 to a collapsed position P2. In other words, this displacement of the gate body 20 opens the overflow gate 6, and river water flows into the regulating reservoir (Figure 6(b)).

[0060] In this case, the watertight rubber 34 suppresses the inflow of water from the river side to the regulating reservoir side via the underside of the gate body 20 until the gate body 20 is displaced from the upright position P1 to a predetermined angle. Therefore, the upright moment M1 acting on the gate body 20 due to the water passing under the gate body 20 is suppressed. As a result, the gate body 20 smoothly displaces from the upright position P1 to the collapsed position P2. Furthermore, in the collapsed position P2, the flat surface 14 of the overflow weir section 11 and the wall surface of the gate body 20 become aligned (almost flush), allowing the overflow water to flow smoothly from the river side to the regulating reservoir.

[0061] Subsequently, as the water level in the regulating reservoir rises and the water level difference between the river and the regulating reservoir disappears, the overturning moment M2 acting on the gate body 20 relatively decreases, and the uprighting moment M1 relatively increases. As a result, the gate body 20 gradually returns from the tilted position P2 to the upright position P1, and when the water level in the regulating reservoir and the water level on the river side become equal and the flow of water from the river side to the regulating reservoir stops, the gate body 20 returns completely to the upright position P1 (Figure 6(c)).

[0062] Subsequently, in addition to the upright moment M1 caused by the weight section 24, an upright moment M1 caused by the water pressure on the regulating reservoir side acts on the gate body 20, maintaining the gate body 20 in the upright position P1, and as a result, the overflow gate 6 is kept closed (Figure 7(a)(b)).

[0063] The water stored in the regulating reservoir is released into the river when the drainage gate 5 is opened at an appropriate time after the river water level returns to its normal level. The release is carried out by an operator activating the drainage gate 5 at the appropriate time. In addition, the water accumulated in the recess 15 of the overflow gate 6 (overflow weir section 11) is drained into the regulating reservoir through the drainage channel 10a formed in the overflow weir section 11 as a result of this release.

[0064] [effect] In the overflow gate 6 (automatic tilting gate) of the embodiment described above, the gate body 20 is equipped with a weight 24 at its lower end and is rotatably supported on the main body 10 via a pivot 18 at a position between an intermediate vertical position and the lower end. When the water level on the river side rises to the set water level, the water pressure causes the gate body 20 to automatically displace from an upright position P1 to a tilted position P2, opening the overflow gate 6 and allowing water to flow from the river side to the regulating reservoir side. Subsequently, when the water level on the river side drops, the gate body 20 returns from the tilted position P2 to an upright position P1, and the overflow gate 6 is automatically closed. In this way, the overflow gate 6 of the embodiment opens and closes the overflow gate 6 by the operation of the gate body 20 based on a principle developed from a roly-poly toy. Therefore, according to the overflow gate 6 of the embodiment, it is possible to fully automate the opening and closing of the gate without using a power source.

[0065] Furthermore, the weight of the weight section 24 and the center of gravity of the gate body 20 are set such that when the gate body 20 is in a collapsed position P2, and the water level difference between the river side and the regulating reservoir side becomes smaller than a predetermined water level difference, it rotates around the pivot 18 by the weight of at least the weight of the weight section 24 and changes to an upright position P1.

[0066] In particular, in the overflow gate 6 of this embodiment, the gate body 20 is configured such that the position of its center of gravity G is located on the river side with respect to the vertical line L1 passing through the pivot 18 in all positions ranging from the upright position P1 to the collapsed position P2. As a result, an upright moment M1 always acts on the gate body 20 regardless of its position. Therefore, according to the overflow gate 6 of this embodiment, the gate body 20, which has been displaced to the collapsed position P2, can be more reliably returned to the upright position P1 as the water level on the river side decreases. In other words, after the gate is opened, it becomes possible to more reliably close the overflow gate 6 with the gate body 20.

[0067] Furthermore, in the overflow gate 6 of this embodiment, the movement of water from the river side to the regulating reservoir side via the underside of the gate body 20 is suppressed by the watertight rubber 34 until it reaches a predetermined angle from the upright position P1. As a result, the upright moment M1 caused by the water passing under the gate body 20 is suppressed from acting on the gate body 20, which has started from the upright position P1. Consequently, when the water level on the river side reaches the set water level, the gate body 20 can be displaced more smoothly from the upright position P1 to the collapsed position P2.

[0068] Furthermore, at least the portion of the lower end of the gate body 20 that is closer to the retention pond than the pivot 18 has an arc shape in a cross-sectional view perpendicular to the pivot 18. This configuration prevents the lower end of the gate body 20 from interfering with the main structure 10 when the gate body 20 changes its posture between the upright position P1 and the reclined position P2.

[0069] Furthermore, in the overflow gate 6 of this embodiment, the structure 10 includes an overflow weir section 11 with a trapezoidal cross-section, which has sloped sections 12 on the river side and on the regulating reservoir side, and a flat section 14 between the two sloped sections 12. The gate body 20 is configured to be stored in a recess 15 formed in the flat section 14 and connected to the flat section 14 when in a collapsed position P2. Specifically, the wall surface of the gate body 20 and the flat section 14 are flush. Therefore, when the overflow gate 6 is opened, the gate body 20 does not easily obstruct the flow of water overflowing the overflow weir section 11, and as a result, water flows smoothly from the river side to the regulating reservoir.

[0070] Furthermore, regarding the overflow gate 6 described above, in other words, the overflow gate 6 is configured to have an overturning force adjustment section that can adjust the overturning force acting on the gate body 20. This overturning force adjustment section functions as part of the overturning force generation mechanism in this embodiment. Examples of this overturning force adjustment section include the structure of the weight section 24 in the gate body 20 and the structure of the watertight rubber 34.

[0071] In other words, the watertight rubber 34 (watertight part) that functions as the overturning force adjustment part is interposed between the lower end of the gate body 20 and the main body 10, and adjusts the range of water movement that passes under the gate body 20 from the river side to the regulating pond side. The watertight rubber 34 is configured to adjust the range of water movement that passes under the gate body 20 from the start of displacement from the upright position until the gate body 20 is displaced to a predetermined angle.

[0072] With this configuration, the water movement area from the river side to the reservoir side, passing under the gate 20, is regulated by the watertight rubber 34, thereby adjusting the upright moment acting on the gate 20 due to the water movement. As a result, when the river water level reaches the set water level, the gate 20 can be more reliably displaced from an upright position to a lowered position. In other words, the watertight rubber 34 can adjust the buoyancy between the river and the reservoir at the lower end of the gate 20. As a result, a rotational moment around the pivot 18 can be efficiently applied to the gate 20.

[0073] Furthermore, in this embodiment, the tipping force adjustment unit is configured to adjust the tipping force acting on the door body 20 by adjusting at least one of the following: the relative position of the weight portion 24 with respect to the door body 22, the shape of the weight portion 24, and the weight of the weight portion 24.

[0074] With this configuration, the tipping force acting on the door body 20 can be adjusted by adjusting at least one of the following: the relative position of the weight portion 24 with respect to the door body 22, the shape of the weight portion 24, and the weight of the weight portion 24.

[0075] [Second embodiment of the overflow gate 6 (automatic tilting gate)] Figure 8 is a front view of the overflow gate 6 as seen from the regulating reservoir side, and Figure 9 is a cross-sectional view of the overflow gate 6 (cross-sectional view along line IX-IX in Figure 8). Figure 10 is an enlarged view of the gate body 20 in Figure 9.

[0076] The overflow gate 6 of the second embodiment differs from the overflow gate 6 of the first embodiment in that the gate body 20 is equipped with a water intake section 25. Other basic configurations are the same as those of the first embodiment. Therefore, the following configurations will explain these differences in detail.

[0077] The gate body 20 according to the second embodiment is equipped with a water intake section 25. The water intake section 25 is intended to facilitate the displacement of the gate body 20 from an upright position P1 to a reclined position P2 when the water level on the river side exceeds a set water level.

[0078] The water intake section 25 includes a water intake port 26, which is a through-hole that penetrates the door body 22 in the thickness direction, and a bucket (water collection container) 28 provided on the wall surface of the door body 22 on the -X side. The water intake port 26 is located in the center of the door body 22 in the width direction and at a height corresponding to the set water level. The bucket 28 is a box-shaped container that opens upward and is fixed adjacent to the lower side of the water intake port 26. In other words, when the water level on the river side reaches the set water level, the overturning moment M2 and the upright moment M1 due to the water pressure become approximately equal. At this point, water flows into the bucket 28 from the river side through the water intake port 26, further adding to the overturning moment M2 due to the water in the bucket 28. As a result, the total overturning moment M2 suddenly becomes larger than the upright moment M1, and the door body 20 is quickly displaced from an upright position P1 to a collapsed position P2. Multiple water intake sections 25 may be arranged at intervals in the width direction of the door body 22.

[0079] Furthermore, in the second embodiment as well, the door body 20 is configured such that the center of gravity G is located slightly to the +X side of the vertical line L1 in both the upright position P1 and the reclined position P2. Also, in the upright position P1, the center of gravity G is located slightly below the pivot 18.

[0080] [Explanation of operation of overflow gate 6] Figures 11 and 12 are explanatory diagrams illustrating the operation of the overflow gate 6 in the second embodiment.

[0081] In the second embodiment, when the river water level reaches the set water level, water flows into the bucket 28 from the river side through the intake 26 (Figure 11(a)). When the river water level reaches the set water level, the upright moment M1 and the overturning moment M2 are approximately equal. However, as water flows into the bucket 28 through the intake 26, an additional overturning moment M2 is added due to the water in the bucket 28, causing the total overturning moment M2 to suddenly exceed the upright moment M1. As a result, the gate body 20 is displaced from an upright position P1 to a collapsed position P2. In other words, the inflow of water into the bucket 28 triggers the displacement of the gate body 20 to the collapsed position P2. This displacement of the gate body 20 opens the overflow gate 6, allowing river water to flow into the regulating reservoir (Figure 11(b)). In this case, the flat section 14 of the overflow weir 11 and the wall surface of the gate body 20 are almost flush, allowing the overflow water to flow smoothly from the river side into the regulating reservoir.

[0082] Subsequently, as the water level in the regulating reservoir rises and the water level difference between the river and the regulating reservoir disappears, the overturning moment M2 acting on the gate body 20 relatively decreases, and the uprighting moment M1 relatively increases. As a result, the gate body 20 gradually returns from the tilted position P2 to the upright position P1, and when the water level in the regulating reservoir and the water level on the river side become equal and the flow of water from the river side to the regulating reservoir stops, the gate body 20 returns completely to the upright position P1 (Figure 11(c)).

[0083] Subsequently, in addition to the upright moment M1 from the weight section 24, an upright moment M1 from the water pressure on the regulating pond side acts on the gate body 20, maintaining the gate body 20 in the upright position P1, and as a result, the overflow gate 6 is kept closed (Figure 12(a)(b)). At this time, any water remaining in the bucket 28 is drained through the drain hole 28a. The water flow rate that the drain hole 28a can tolerate is smaller than the water flow rate that the intake port 26 can tolerate. Therefore, a sufficient overturning moment M2 can be added when the gate body 20 collapses. Furthermore, the drain hole 28a prevents water from remaining in the bucket 28 or rainwater from accumulating when the gate body 20 is in the upright position.

[0084] The water stored in the regulating reservoir will be released into the river when the drainage gate 5 is opened at the appropriate time, after the river water level has returned to its normal level.

[0085] [effect] According to the overflow gate 6 (automatic tilting gate) of the second embodiment described above, the gate body 20 has a water intake section 25, and when the water level on the river side exceeds the set water level, water flows into the bucket 28 from the water intake 26, and an additional tilting moment M2 is added to the gate body 20, displacing the gate body 20 to a tilted position P2. In other words, the tilting moment M2 acting on the gate body 20 due to the water flowing in from the water intake 26 acts as a trigger, smoothly displacing the gate body 20 from an upright position P1 to a tilted position P2. For this reason, with the overflow gate 6 of the second embodiment, when the water level on the river side reaches the set water level, it is possible to displace the gate body 20 from an upright position P1 to a tilted position P2 more reliably and quickly, and open the overflow gate 6.

[0086] Furthermore, this water intake section 25 constitutes the auxiliary overturning force generating section in this embodiment. The auxiliary overturning force generating section receives water inflow from the river side and generates an auxiliary overturning force that displaces the gate body 20 from an upright position P1 to a collapsed position P2. More specifically, the auxiliary overturning force generating section is located on the gate body 20 and includes a water intake 26 that receives water from the river side when the water level on the river side reaches the set water level, and the water received from the water intake 26 acts a force on the gate body 20 that displaces it to the collapsed position P2. The auxiliary overturning force of this auxiliary overturning force generating section generates a moment in the direction that causes the gate body to collapse. Therefore, it is possible to appropriately apply a force to the gate body 20 that causes it to collapse.

[0087] This auxiliary overturning force generating unit constitutes part of the overturning force generating mechanism in this embodiment. The overturning force generating mechanism generates an overturning force that causes the door body 20 to be displaced from an upright position P1 to a collapsed position P2.

[0088] Therefore, in this embodiment as well, it is possible to reliably generate a tipping force that causes the door body 20 to displace from an upright position P1 to a collapsed position P2.

[0089] Furthermore, the other effects of the overflow gate 6 according to the first embodiment are similarly manifested in the second embodiment.

[0090] Figure 13 is a diagram (graph) illustrating the effect of the water intake section 25, showing the relationship between the river water level and the overturning moment M2. In Figure 13, the solid line (Example 1) shows the change in the overturning moment M2 of the gate body 20 in the first embodiment, and the dashed line (Example 2) shows the change in the overturning moment M2 of the gate body 20 in the second embodiment.

[0091] As shown in Figure 13, in the case of the gate body 20 of the first embodiment, the overturning moment M2 due to water pressure gradually increases as the water level on the river side rises. In the figure, Ma is the overturning moment M2 at the set water level Ha, and is approximately the same value as the upright moment M1. Therefore, in the case of the gate body 20 of the first embodiment, after the overturning moment M2 reaches Ma, the gate body 20 is displaced from an upright position P1 to a collapsed position P2 as the water level rises.

[0092] On the other hand, in the case of the gate body 20 of the second embodiment, the change in the overturning moment M2 until the water level on the river side reaches the set water level Ha is the same as that of the gate body 20 of the first embodiment. However, in the case of the gate body 20 of the second embodiment, when the water level on the river side reaches the set water level Ha, the overturning moment M2 increases almost instantly from Ma to Mb. This is because, as previously described, an overturning moment M2 is added due to water flowing into the bucket 28 from the river side through the intake 26. In this way, the overturning moment M2 increases instantly from Ma to Mb, making it possible to displace the gate body 20 from the upright position P1 to the collapsed position P2 more reliably and quickly when the water level on the river side reaches the set water level Ha.

[0093] In the first embodiment, the condition is that the overturning moment M1 ≈ the uprighting moment M2, but in the second embodiment, since the overturning moment changes abruptly from Ma to Mb, the automatic overturning gate can function as long as the uprighting moment M1 is within the range of Ma and Mb (Ma ≤ M1 ≤ Mb). Therefore, in the gate body 20 of the first embodiment, in order to displace the gate body 20 to the collapsed position P2 when the water level on the river side reaches the set water level Ha, the gate body 20 must be constructed to a certain extent so that the overturning moment M2 at the set water level Ha is Ma, as shown in Figure 13. However, in the case of the gate body 20 according to the second embodiment, the overturning moment M2 at the set water level Ha increases abruptly from Ma to Mb due to the action of the water intake section 25, so even if the gate body 20 is not constructed to a precise degree, it is possible to displace the gate body 20 to the collapsed position P2 at the set water level Ha. In other words, the tolerance for manufacturing errors of the gate body 20 is large. For this reason, the overflow gate 6 of the second embodiment has the advantage of being easy to construct.

[0094] [Method for adjusting the force of falls] The above embodiments and the following modifications include the following method: a method for adjusting the tipping force of an automatic tipping gate installed between a river and a regulating reservoir, which opens and closes the gate according to the water level of the river.

[0095] This method is The automatic tilting gate is to prepare a gate body 20 having a frame 10, a gate body 22, and a weight portion 24 positioned at the lower end of the gate body 22 in an upright position (preparation step), The door body 20 is rotatably supported on the frame 10 via a pivot 18 at a position between the middle and lower end of the door body 22 in the vertical direction, so that the door body 20 can be displaced between an upright position that closes the gate and a reclined position that opens the gate (supporting step). The gate maintains the upright position until the river water level reaches a set level, and when the river water level exceeds the set level, the water pressure displaces the gate from the upright position to the downed position, allowing water to flow from the river to the regulating reservoir. Furthermore, when the gate is in the downed position, if the water level difference between the river and the regulating reservoir becomes smaller than a predetermined water level difference, the weight of the weight portion 24 is set such that the gate rotates around the pivot 18 and changes back to the upright position, and the center of gravity of the gate is always located on the river side with respect to the vertical line passing through the pivot 18 in all positions from the upright position to the downed position (setting step). It is equipped with.

[0096] This method develops and applies the principle of a roly-poly toy, where applying force to the top causes it to tip over in the opposite direction, and removing the force returns it to its original position. Specifically, the gate body 20 maintains an upright position until the river water level reaches a set level. When the river water level exceeds the set level, the water pressure causes the gate body 20 to shift from an upright position to a fallen position. As a result, it is possible to open the gate according to the river water level without using a dedicated power source.

[0097] Furthermore, in this automatic tilting gate's tilting force adjustment method, when the water level difference between the river and the regulating reservoir falls below a predetermined water level difference, the gate body 20 is displaced from a tilted position to an upright position by at least the weight of the counterweight 24. As a result, the gate can be closed without the use of a dedicated power source.

[0098] Furthermore, with this method, in all positions from the upright position to the reclined position, the center of gravity of the gate body 20 is located on the river side with respect to the vertical line passing through the pivot 18. Therefore, a force (uprighting moment) that returns the gate body 20 to the upright position always acts on it, regardless of its position. As a result, as the river water level drops, it becomes possible to reliably return the gate body 20 to the upright position, that is, to reliably close the gate.

[0099] The above method may further include adjusting the tipping force acting on the door body 20 by adjusting at least one of the following: the relative position of the weight portion 24 with respect to the door body 22, the shape of the weight portion 24, and the weight of the weight portion 24.

[0100] By this method, the tipping force acting on the door body 20 can be adjusted by adjusting at least one of the following: the relative position of the weight portion 24 with respect to the door body 22, the shape of the weight portion 24, and the weight of the weight portion 24.

[0101] [Differentiations, etc.] The overflow gate 6 described above is an example of a preferred embodiment of the automatic tilting gate according to the present invention, and its specific configuration can be modified as appropriate without departing from the spirit of the present invention. For example, the following configurations (1), (2), (3), and (4) are also applicable.

[0102] (1) In the overflow gate 6 of the second embodiment, the water intake section 25 of the gate body 20 is composed of a water intake port 26 formed in the gate body 20 and a bucket 28 that receives the water flowing in through the water intake port 26. However, the specific configuration of the water intake section 25 is not limited to this. For example, a configuration of the water intake section 25 as shown in Figure 14 can also be adopted.

[0103] Figure 14 is a cross-sectional view of the main part of the overflow gate 6 according to a modified example, and mainly shows the configuration of the gate body 20. The intake section 25 shown in Figure 14 has an intake port 23a provided at a height position corresponding to the set water level when the gate body 20 is in an upright position P1, a drain port 23b provided at the lower end of the gate body 20, and a guide pipe section 23 (guide pipeline) extending vertically inside the gate body 20 that connects the intake port 23a and the drain port 23b. The intake port 23a is provided on the wall surface on the +X side of the gate body 22, and the drain port 23b is provided on the lower surface (bottom surface) of the gate body 20. In other words, the intake section 25 shown in Figure 14 takes in water from the river side through the intake port 23a and guides this water through the guide pipe section 23 into the space between the lower end of the gate body 20 and the main body 10, more specifically, between the lower surface of the gate body 20 and the inner bottom surface of the recess 15. Furthermore, the guide tube section 23 constitutes part of the auxiliary tipping force generating section in this modified example.

[0104] In the upright position P1, the lower end (bottom surface) of the door body 20 is surrounded by the upright stopper 30 and sealing member 38 that are in close contact with the door body 20 and the wall surface of the recess 15, and the water taken in from the water intake port 23a is guided into this space. As water is introduced between the bottom surface of the door body 20 and the inner bottom surface of the recess 15 in this way, buoyancy F is generated on the door body 20, and this buoyancy F adds an overturning moment M2 to the door body 20. Therefore, even with the configuration of the water intake section 25 shown in Figure 14, it is possible to enjoy the same effects as the water intake section 25 of the second embodiment shown in Figure 10. In this case, however, in order to ensure that the overturning moment M2 due to buoyancy F acts on the door body 20 more reliably, it is preferable to place the pivot 18 at the -X side end of the door body 20 as shown in Figure 14.

[0105] (2) In the above embodiment, the gate body 20 was described as having an L-shape in cross-section, as shown in Figure 4, but the present invention is not limited thereto. Figure 15 is a cross-sectional view of the main part of an overflow gate 6 according to another modified example, and mainly shows the configuration of the gate body 20. As shown in Figure 15, the downstream surface of the gate body 20 is inclined in cross-section, and the gate body 20 becomes thicker towards the bottom, so the shape is not L-shaped, but the weight section 24 and the gate body 20 are continuous. Also, in any embodiment or modified example, the gate body 20 is not limited to steel, but may be made of synthetic resin or aluminum. Also, in Figure 15, the gate body 20 may be configured in such a way that the upper and lower downstream surfaces are inclined in cross-section, causing the gate body 20 to become thicker towards the bottom.

[0106] (3) In each of the above embodiments, the center of gravity G of the gate body 20 was described as being slightly below the pivot 18 and slightly to the +X side of the vertical line L1 in the upright position P1, but the present invention is not limited thereto. In the upright position P1, the center of gravity G of the gate body 20 may be set slightly above the pivot 18 and slightly to the +X side of the vertical line L1. In this case as well, it is sufficient that the center of gravity G is always located on the river side with respect to the vertical line L1 passing through the pivot 18 in all positions from the upright position P1 to the reclined position P2.

[0107] (4) In each of the embodiments described above, an example was given in which the automatic tilting gate according to the present invention is applied to the overflow gate 6 of a flood control facility 1. That is, an example was given in which the upstream element of the present invention is a river and the downstream element is a regulating reservoir. However, the use of the automatic tilting gate according to the present invention is not limited to the overflow gate 6, and it can be applied to various uses in which the gate is placed between the upstream element and the downstream element and opens and closes according to the water level of the upstream element. [Explanation of Symbols]

[0108] 1 Flood equipment 6. Overflow gate (automatic tilting gate) 10 skeleton 11 Overflow weir 12. Sloping section 14 Flat part (top part) 15 recesses 18 Axis 20 Door Body 22 Door body 24 Weight section 25. Water intake section (auxiliary tipping force generation section) 26 Water intake 28. Bucket (water collection container) 34. Watertight rubber (watertight section, tipping force adjustment section)

Claims

1. An automatic tilting gate is provided between the upstream element and the downstream element, and opens and closes the gate according to the water level in the upstream element. The structure and, The structure comprises a door body that is rotatably supported on the aforementioned frame via a pivot and displaceable between an upright position for closing the gate and a reclined position for opening the gate, The gate body comprises a gate body and a weight portion positioned at the lower end of the gate body in the upright position, and is supported by the building structure via the pivot at a position between the middle and lower end of the gate body in the vertical direction, and maintains the upright position until the water level of the upstream element reaches a set water level, and when the water level of the upstream element exceeds the set water level, it is displaced from the upright position to the collapsed position by water pressure, allowing water to flow from the upstream element to the downstream element, while in the collapsed position, when the water level difference between the upstream element and the downstream element becomes smaller than a predetermined water level difference, the weight of the weight portion is set such that it rotates around the pivot by at least its own weight and changes to the upright position, and the center of gravity of the gate body is always located on the side of the upstream element with respect to the vertical line passing through the pivot in all positions from the upright position to the collapsed position.

2. In the automatic tilting gate according to claim 1, An automatic tilting gate further comprising a tilting force generating mechanism that generates a tilting force for the gate body to be displaced from the upright position to the tilted position.

3. In the automatic tilting gate according to claim 2, The tipping force generating mechanism is an automatic tipping gate having a tipping force adjustment unit that can adjust the tipping force acting on the door body.

4. In the automatic tilting gate according to claim 3, The tipping force adjustment unit is interposed between the lower end of the door body and the main body and includes a watertight portion that adjusts the range of water movement from the upstream element side to the downstream element side, passing through the lower side of the door body. The watertight section adjusts the range of water movement passing under the gate body from the time displacement begins from the upright position until the gate body is displaced to a predetermined angle, and is an automatic tilting gate.

5. In the automatic tilting gate according to claim 4, An automatic tilting gate, wherein at least the portion of the lower end of the gate body that is on the downstream side of the pivot has an arc shape in a cross-sectional view perpendicular to the pivot.

6. In the automatic tilting gate according to claim 3, An automatic tipping gate, wherein the tipping force adjustment unit is configured to adjust the tipping force acting on the door body by adjusting at least one of the relative position of the weight portion with respect to the door body, the shape of the weight portion, and the weight of the weight portion.

7. In the automatic tilting gate according to claim 2, The tipping force generating mechanism is an automatic tipping gate having an auxiliary tipping force generating unit that accepts the intrusion of water from the upstream element and generates an auxiliary tipping force for the gate body to be displaced from the upright position to the tilted position.

8. In the automatic tilting gate according to claim 7, The auxiliary tilting force generating unit is arranged on the gate body and includes a water intake that receives water from the upstream element when the water level of the upstream element reaches the set water level, and has a water intake that applies a force to the gate body that displaces it to the tilted position due to the water received from the water intake.

9. In the automatic tilting gate according to claim 8, The water intake section includes an automatic tilting gate, which is installed on the wall surface on the downstream side of the gate body to receive water flowing in from the water intake.

10. In the automatic tilting gate according to claim 9, The water collection container is an automatic tilting gate, which is equipped with a drain hole that allows the door body to drain the water inside the water collection container when it is in the upright position.

11. In the automatic tilting gate according to claim 8, The water intake section includes a guide pipe for guiding the water received from the water intake between the lower end of the gate body and the main body, and is an automatic tilting gate.

12. In the automatic tilting gate according to claim 1 or 2, The aforementioned upstream element is a river, The downstream element is a regulating reservoir located adjacent to the river. The structure has a trapezoidal cross-section having a pair of sloping sections provided on the river side and the regulating reservoir side, respectively, and an upper surface section positioned between the pair of sloping sections, and includes an overflow weir section formed in a recess shape on the upper surface section. An automatic tilting gate, wherein the gate body is positioned within the recessed overflow weir section, and in the tilted position, the wall portion of the gate body is stored within the recess so as to connect with the upper portion.

13. A method for adjusting the tilting force of an automatic tilting gate, which is provided between an upstream element and a downstream element and opens and closes the gate according to the water level of the upstream element, The aforementioned automatic tilting gate is prepared by providing a frame and a door body having a door body and a weight portion positioned at the lower end of the door body in an upright position, The door body is rotatably supported on the building structure via a pivot at a position between the middle and lower end of the door body in the vertical direction, so that the door body can be displaced between an upright position that closes the gate and a reclined position that opens the gate. The gate body maintains its upright position until the water level in the upstream element reaches a set water level, and when the water level in the upstream element exceeds the set water level, it is displaced from the upright position to the reclined position by water pressure, allowing water to flow from the upstream element to the downstream element. At the same time, when the water level difference between the upstream and downstream elements becomes smaller than a predetermined water level difference while in the reclined position, the weight of the counterweight is set such that it rotates around the pivot by its own weight and changes back to the upright position. Furthermore, the center of gravity of the gate body is set to always be located on the side of the upstream element with respect to the vertical line passing through the pivot in all positions from the upright position to the reclined position. A method for adjusting the tipping force of an automatic tipping gate, which includes the above.

14. A method for adjusting the tipping force of an automatic tipping gate according to claim 13, A method for adjusting the tipping force of an automatic tipping gate, further comprising adjusting the tipping force acting on the door body by adjusting at least one of the relative position of the weight portion with respect to the door body, the shape of the weight portion, and the weight of the weight portion.

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