Floating type undulating gate

Abstract

To suppress oscillation of a door body in standing.SOLUTION: A floating body type derricking gate 1 comprises: a door body 10 rotating around a base end side by buoyance generated by infiltration water to stand; and a restraint member 51 disposed at a lower face side of the door body 10 in a lying state, rotating by the buoyance to stand along with a standing operation of the door body 10, and restraining a lying operation of the door body 10 since the door body 10 to lie hits a second end face 51b.SELECTED DRAWING: Figure 17

Description

[Technical field]

[0001] The technology of this disclosure relates to floating relief gates. [Background technology]

[0002] As a type of elevation gate for preventing inundation due to floods and tsunamis, a floating elevation gate in which the gate body rotates and stands up due to the buoyancy generated by the infiltrating water, as disclosed in Patent Document 1, for example, has been known. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5948206 Summary of the Invention [Problem to be solved by the invention]

[0004] In the floating-type elevation gate described above, the gate body may swing due to waves generated during flooding. In other words, the gate body may alternate between rising and lowering. When the gate body swings, the amount of overtopping increases, especially when the water level is low (i.e., when the inclination angle of the gate body relative to the horizontal plane is small).

[0005] The technology disclosed herein has been made in consideration of such circumstances, and its purpose is to provide a floating-type rise-and-fall gate that can suppress the swinging of the door body when raised. [Means for solving the problem]

[0006] The floating-type rise-and-fall gate of the present disclosure includes a door body and a stopper member. The door body rotates around the base end side and stands up due to buoyancy caused by intrusion of water. The stopper member is disposed on the underside of the door body in a collapsed state, rotates and stands up as the door body stands up, and stops the collapse of the door body by hitting the upper end of the door body that is about to collapse. Effect of the Invention

[0007] According to the above-mentioned floating type rise-and-fall gate, the swinging of the gate body during raising can be suppressed. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a diagram showing a schematic configuration of a floating elevation gate when it is lowered, as viewed from the side. [Diagram 2] FIG. 2 is a plan view showing the schematic configuration of the floating elevation gate when it is lowered. [Diagram 3] FIG. 3 is a graph showing the relationship between flood depth and the opening angle of the gate body. [Figure 4] FIG. 4 is a graph showing the overturning moment acting on the door body according to the erection angle. [Diagram 5] FIG. 5 is a view equivalent to FIG. 1, showing one state of the floating elevation gate during its elevation. [Figure 6] FIG. 6 is a view equivalent to FIG. 1, showing one state of the floating elevation gate during its elevation. [Figure 7] FIG. 7 is a view equivalent to FIG. 1, showing one state of the floating elevation gate during its elevation. [Figure 8] FIG. 8 is a view equivalent to FIG. 1 showing the floating elevation gate in its completed erection state. [Figure 9] FIG. 9 is a view equivalent to FIG. 1, showing one state of the floating elevation gate during its lowering. [Figure 10] FIG. 10 is a view equivalent to FIG. 1, showing one state of the floating elevation gate during its lowering. [Figure 11] FIG. 11 is a view corresponding to FIG. 1, showing a state during a forced standing-up operation. [Figure 12] FIG. 12 is a view showing a state during a forced standing-up operation as viewed from the upstream side. [Figure 13] FIG. 13 is a view showing the state when the forced standing-up operation is completed, as viewed from the upstream side. [Figure 14] FIG. 14 is a view corresponding to FIG. 1, illustrating a state when the forced standing-up operation is completed. [Figure 15] FIG. 15 is a diagram showing a schematic configuration of the falling prevention mechanism as viewed from the side. [Figure 16] FIG. 16 is a diagram showing a schematic configuration of the falling-down prevention mechanism as viewed from the upstream side. [Figure 17] FIG. 17 is a diagram showing a state in which the restraining member of the falling-down restraining mechanism is raised. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Exemplary embodiments will now be described in detail with reference to the accompanying drawings.

[0010] The floating-type rise-and-fall gate 1 of this embodiment (hereinafter also simply referred to as the rise-and-fall gate 1) is installed on the road surface R (land) and prevents water from entering living spaces or underground spaces due to floods, tsunamis, or heavy rain, and is sometimes called a floating flap gate. The rise-and-fall gate 1 automatically performs rising and lowering movements by utilizing water that is trying to enter.

[0011] As shown in Figures 1 and 2, the rise-and-fall gate 1 includes a door body 10, a storage section 18, a door stopper 20, an auxiliary drive section 30, and a forced rise mechanism 40. Note that a collapse prevention mechanism 50, which will be described later, is not shown in Figures 1 and 2. The same applies to Figures 3 to 8, which will be described later.

[0012] The door body 10 rotates and stands up due to buoyancy caused by the intrusion of water. Specifically, the door body 10 has a main body 10a and a skin plate 10b. The main body 10a is formed into a slightly flattened, approximately rectangular body. The skin plate 10b is a plate-like member provided on the upper surface of the main body 10a when the door body 10 is in a laid-down state (i.e., the state shown in FIG. 1).

[0013] The door body 10 stands up by rotating around the base end side. Specifically, the door body 10 has a rotation shaft 11 on the base end side and is provided so as to be freely rotatable around the rotation shaft 11. The door body 10 stands up by rotating clockwise in FIG. 1 and falls down by rotating counterclockwise in FIG. 1. The door body 10 is normally in a lying down state, and is configured to stand up by rotating from the lying down state in an emergency (i.e., when water has entered). In other words, the door body 10 starts the standing up action by utilizing the entering water.

[0014] In Fig. 1, water infiltrates from the left side. In addition, the "upstream side" and "downstream side" described below are defined as the upstream side (left side in Fig. 1) and downstream side (right side in Fig. 1) in the water infiltration direction, and the "left-right direction" is defined as the right side facing downstream in the water infiltration direction as the "right" and the left side as the "left". In addition, the "width direction" of the door body 10 is defined as the left-right direction of the door body 10.

[0015] When the door body 10 is in a laid-down state, the upstream end becomes the tip portion 12. The door stop 20 is provided on both sides (i.e., the left side and the right side) of the door body 10. The door body 10 has a watertight rubber (not shown) attached to the side portion that faces the door stop 20. The rise-and-fall gate 1 is made watertight by the watertight rubber of the door body 10 coming into contact with the door stop 20.

[0016] The storage section 18 stores the door body 10 when it is lowered. The storage section 18 is a recess formed in the road surface R, and is formed into a rectangle larger than the door body 10 in a plan view. When the door body 10 is stored in the storage section 18, i.e., when the door body 10 is lowered, the upper surface of the door body 10 and the road surface R are approximately flush with each other. In other words, the door body 10 in the lowered state (more specifically, the skin plate 10b) constitutes a part of the road surface R. In the door body 10 in the lowered state, the skin plate 10b protrudes upstream relative to the main body 10a.

[0017] The auxiliary drive unit 30 assists the rising action of the door body 10 due to buoyancy caused by the intrusion of water. More specifically, the auxiliary drive unit 30 has a function of assisting the rising action of the door body 10 and a function of mitigating the impact when the rising is completed and suppressing the sudden collapse of the door body 10 when the water level drops by changing the correlation between the water level balance angle of the door body 10 (i.e., the inclination angle of the door body 10 at which the moment due to the water pressure and the moment due to the weight of the door body 10 are equal) and the flood depth. The inclination angle of the door body 10 is the inclination angle of the door body 10 with respect to the horizontal plane, and is the rising angle of the door body 10.

[0018] Specifically, the auxiliary driving unit 30 has a counterweight 31, a wire rope 32, and a pair of fixed pulleys 33, 34. The auxiliary driving units 30 are arranged in pairs on the upstream side of the door body 10 at positions corresponding to both ends of the door body 10 in the width direction (see FIG. 2).

[0019] Two wire ropes 32 are attached to the tip 12 of the door body 10. More specifically, one ends of the two wire ropes 32 are attached to both ends of the tip 12 in the width direction of the door body 10. Specifically, connecting parts 13 are provided at both ends of the tip 12 in the width direction of the door body 10, and one end of the wire rope 32 is connected to the connecting parts 13. The counterweight 31 is connected to the other ends of each of the two wire ropes 32.

[0020] The pair of fixed pulleys 33, 34 is the lower fixed pulley 33 and the upper fixed pulley 34. The wire rope 32 is wound around the pair of fixed pulleys 33, 34 so that the counterweight 31 reaches the lowest point when the inclination angle of the door body 10 with respect to the horizontal plane reaches a predetermined angle (for example, 45 degrees). The wire rope 32 is wound around the fixed pulley 33 and the fixed pulley 34 in this order from one end side (i.e., the door body 10 side).

[0021] According to the auxiliary drive unit 30 configured in this manner, as shown by the solid line graph in Fig. 3, during the raising operation of the door body 10, the door body 10 is pulled in the raising direction by the counterweight 31 and the raising operation is assisted until the inclination angle of the door body 10 reaches the predetermined angle θa, so the door body 10 starts to rise at a stage when the flood depth is low compared to when the auxiliary drive unit is not provided (graph shown by the dashed line in Fig. 3). Then, when the inclination angle of the door body 10 exceeds the predetermined angle θa, the counterweight 31 acts as a resistance to the raising operation of the door body 10, so the door body 10 is prevented from rising suddenly compared to when the auxiliary drive unit is not provided.

[0022] On the other hand, when the door body 10 is lowered, the counterweight 31 pulls the door body 10 in the lowering direction to promote the lowering motion until the inclination angle of the door body 10 reaches the predetermined angle θa, so that the door body 10 starts lowering from the early stage of the water level drop and the sudden lowering of the door body 10 is suppressed, compared to the case where the auxiliary drive unit is not provided. Then, when the inclination angle of the door body 10 becomes less than the predetermined angle θa, the counterweight 31 acts as a resistance to the lowering motion of the door body 10, so that the door body 10 lands on the floor later than the case where the auxiliary drive unit is not provided.

[0023] In other words, as shown in Fig. 4, with the auxiliary drive unit 30, the overturning moment acting on the door body 10 (graph shown by solid line) is the sum of the overturning moment due to the door body 10's own weight (graph shown by dashed line) and the overturning moment due to the counterweight 31's own weight (graph shown by dashed line), and increases as the inclination angle (standing angle) of the door body 10 increases. Here, the overturning moment is the moment that rotates the door body 10 in the falling direction.

[0024] The forced standing mechanism 40 is a mechanism that forcibly stands the door body 10, not by buoyancy caused by intrusion of water. For example, the door body 10 is forced to stand when inspecting it or when it is desired to have the door body 10 standing before flooding occurs. The forced standing mechanism 40 of this embodiment forcibly stands the door body 10 manually.

[0025] More specifically, the forced erection mechanism 40 has two wire ropes 41 , two fixed pulleys 42 , two pulley blocks 43 , and one chain block 44 .

[0026] The first end 41a of each of the two wire ropes 41 is connected to both ends of the door body 10 in the width direction. More specifically, the first end 41a of each of the two wire ropes 32 is connected to the upper surface of both ends of the door body 10 in the width direction in the fallen state when the door body 10 is forcibly erected. More specifically, a connecting portion 14 is provided on the upper surface of the door body 10 in the fallen state, and the first end 41a of the wire rope 32 is connected to the connecting portion 14. Each of the two wire ropes 41 is wound around the two fixed pulleys 42. The forced erection mechanism 40 forcibly erects the door body 10 by pulling the second end 41b, which is the other end of the two wire ropes 41. The wire rope 41 is an example of a first cord-like member.

[0027] The two pulley blocks 43 redirect each of the two wire ropes 41 so that the second end 41b of the wire rope 41 extending from the fixed pulley 42 faces the center of the door body 10 in the width direction. The pulley block 43 has a pulley portion 43a around which the wire rope 41 is wound, and an attachment portion 43b for attachment to another member. The pulley portion 43a and the attachment portion 43b are connected to each other so as to be freely rotatable. The pulley block 43 is an example of a redirecting pulley.

[0028] The chain block 44 has a main body 44a, two hooks (i.e., a first hook 44b and a second hook 44c), a load chain 44d, and a hand chain 44e. Gears, mechanical brakes, and the like are housed in the main body 44a. The first hook 44b is fixed to the main body 44a. The second hook 44c is connected to the main body 44a via the load chain 44d. In other words, the load chain 44d extends from the main body 44a and is connected to the second hook 44c. Two hand chains 44e extend from the main body 44a.

[0029] In the chain block 44, when the door body 10 is forced to stand, the second end 41b of each of the two wire ropes 41 is connected to the first hook 44b and the second hook 44c. The hand chain 44e is pulled by an operator to bring the first hook 44b and the second hook 44c closer to each other. More specifically, in the chain block 44, by pulling one of the two hand chains 44e, the load chain 44d is wound in the main body 44a, and the distance between the first hook 44b and the second hook 44c (hereinafter also referred to as the hook distance) is shortened. As a result, the second end 41b of the two wire ropes 41 is pulled toward the center of the width direction of the door body 10, and the door body 10 is forced to stand. In addition, when the door body 10 is to be lowered, the load chain 44d is unwound from the main body 44a by pulling the other hand chain 44e, and the hook distance is lengthened.

[0030] The forced standing mechanism 40 is disposed on the downstream side of the door body 10. Specifically, the two fixed pulleys 42 and the two pulley blocks 43 are respectively attached to the door stop 20, which is a structure provided on both sides of the door body 10. More specifically, the fixed pulley 42 is fixed to the surface of the door stop 20 facing the door body 10. The pulley block 43 has an attachment portion 43b detachably attached to the surface of the door stop 20 facing the door body 10. The pulley block 43 is provided below the fixed pulley 42.

[0031] When the door body 10 is not forcibly raised, each of the two wire ropes 41 is wound around the fixed pulley 42 and the pulley portion 43a of the pulley block 43, and both ends of the wire rope 41 are detachably attached to the door stop 20. More specifically, each of the first end 41a and the second end 41b of the wire rope 41 is detachably attached to a pin 45 provided on the surface of the door stop 20 facing the door body 10. The chain block 44 is detachably attached to one of the door stops 20. More specifically, the first hook 44b of the chain block 44 is detachably attached to a pin 46 provided on the surface of the door stop 20 facing the door body 10.

[0032] Next, the raising operation of the door body 10 when water enters will be described with reference to Figures 5 to 8. In Figures 5 to 8, the forced raising mechanism 40 is omitted.

[0033] When water infiltrates into the door body 10 in the down position, the buoyancy caused by the infiltrating water causes the door body 10 to start rising. At that time, as shown in FIG. 5, a lifting force by the counterweight 31 acts on the door body 10, so the door body 10 is pulled in the rising direction by the lifting force, and the rising action is assisted. The counterweight 31 descends as the door body 10 rises. As the door body 10 rises, water accumulates on the upstream side of the door body 10 and the water level rises. Therefore, the door body 10 is pushed in the rising direction by the water pressure, and the rising action is assisted. As the inclination angle θ of the door body 10 increases, the lifting force by the counterweight 31 decreases, and the overturning moment acting on the door body 10 increases accordingly.

[0034] Then, as shown in FIG. 6, when the inclination angle θ of the door body 10 reaches a predetermined angle θa (for example, 45 degrees), the wire rope 32 extending from the fixed pulley 33 to the door body 10 and the door body 10 become in a straight line, and the counterweight 31 reaches the lowest point. Then, as shown in FIG. 7, when the inclination angle θ of the door body 10 exceeds the predetermined angle θa, the counterweight 31 rises as the door body 10 rises. Then, as shown in FIG. 8, when the inclination angle θ of the door body 10 reaches a rising completion angle (for example, 75 degrees), the door body 10 is in a completely rising state and the rising operation is completed. Thus, when the counterweight 31 is rising, the counterweight 31 becomes a resistance to the rising operation of the door body 10, so the overturning moment acting on the door body 10 increases. Therefore, it is possible to mitigate the impact generated when the rising operation of the door body 10 is completed.

[0035] Next, the lowering operation of the door body 10 when the water level drops will be described with reference to Figures 9 and 10. In Figures 9 and 10, the forced standing mechanism 40 is omitted.

[0036] As shown in Figure 9, the door body 10 in the upright state starts to collapse when the water level drops. At that time, the door body 10 is pulled in the collapse direction by the counterweight 31, facilitating the collapse. In this way, the door body 10 collapses following the lowering water level. The counterweight 31 descends as the door body 10 collapses. As the inclination angle θ of the door body 10 decreases, the pulling force by the counterweight 31 decreases, and the overturning moment acting on the door body 10 decreases accordingly.

[0037] Then, as shown in FIG. 10, when the inclination angle θ of the door body 10 becomes smaller than a predetermined angle θa (45 degrees), the counterweight 31 rises as the door body 10 falls. Then, as shown in FIG. 1, when the inclination angle θ of the door body 10 reaches 0 degrees, the door body 10 is completely in a fallen state and the falling motion is completed. In other words, the door body 10 is stored in the storage section 18. At this time, the counterweight 31 reaches the uppermost point. Thus, when the counterweight 31 is rising, the counterweight 31 acts as a resistance to the falling motion of the door body 10, so the tipping moment acting on the door body 10 is reduced. Therefore, it is possible to suppress the sudden fall of the door body 10 and to mitigate the impact generated when the falling motion is completed.

[0038] Next, the forced raising operation of the door body 10 will be described with reference to Figs.

[0039] 11, a worker removes the first end 41a and the second end 41b of each of the two wire ropes 41 from the pin 45. Then, the worker connects the first end 41a of the wire rope 41 to the connecting portion 14 of the door body 10, while directing the second end 41b of the wire rope 41 from the pulley block 43 toward the center of the door body 10 in the width direction.

[0040] Next, the worker removes the chain block 44 from the pin 46. Then, as shown in FIG. 12, the worker connects the second end portions 41b of the two wire ropes 41 to the first hook 44b and the second hook 44c of the chain block 44. At this time, since the distance between the second end portions 41b of the two wire ropes 41 is long, the distance between the hooks in the chain block 44 is also long accordingly. In addition, the main body 45a of the chain block 44 is in a state in which it is closer to the wire rope 41 connected to the first hook 44b than to the center of the width direction of the door body 10.

[0041] Next, the worker pulls the hand chain 44e of the chain block 44 to bring the first hook 44b and the second hook 44c closer to each other. That is, the distance between the hooks is shortened. Therefore, the two wire ropes 41 are subjected to equal tension, and each of the two wire ropes 41 is pulled toward the center of the width of the door body 10. As a result, the two wire ropes 41 apply equal pulling forces to the door body 10. That is, the door body 10 is pulled in the erecting direction by the two wire ropes 41 and erects. The main body 45a of the chain block 44 moves toward the center of the width of the door body 10 as the distance between the hooks is shortened.

[0042] Then, when the hand chain 44e is pulled until the main body 44a of the chain block 44 moves to the center of the width of the door body 10 as shown in Figure 13, the door body 10 rises to the complete raising angle as shown in Figure 14, and the forced raising operation is completed.

[0043] <Configuration and operation of the collapse prevention mechanism> As shown in Fig. 15 and Fig. 16, the rise-and-fall gate 1 further includes a fall-prevention mechanism 50. The fall-prevention mechanism 50 prevents the door body 10, which has once rotated in the standing direction, from rotating in the falling direction during the standing operation of the door body 10. Note that the connecting parts 13 and 14 are not shown in Fig. 15 and Fig. 16.

[0044] The falling-down prevention mechanism 50 has a prevention member 51 and a rotating shaft 52. In this embodiment, a pair of the falling-down prevention mechanisms 50 is provided at each end in the width direction of the door body 10. The falling-down prevention mechanisms 50 are provided on the underside of the door body 10 in the fallen state.

[0045] The stopping member 51 is positioned on the underside of the door body 10 in the fallen state, and rotates and stands up as the door body 10 stands up, stopping the falling movement of the door body 10 by the door body 10 hitting the second end face 51b, which is the upper end.

[0046] Specifically, the stopping member 51 rotates and stands up due to buoyancy caused by the intrusion of water as the door body 10 stands up. The stopping member 51 is formed in a columnar shape, more specifically, a rectangular columnar shape. The stopping member 51 is disposed on the bottom surface 18a of the storage section 18, which is the lower surface side of the door body 10 in the lying down state. As shown in FIG. 15, the stopping member 51 is disposed in a lying down state in the storage section 18. That is, the stopping member 51 is disposed in a state extending in the upstream and downstream directions (i.e., the water intrusion direction). In this embodiment, the stopping member 51 is made of wood.

[0047] The pivot shaft 52 is provided at the upstream end of the stopping member 51. More specifically, the pivot shaft 52 extends in the width direction of the door body 10. The pivot shaft 52 is provided at a connection between a first end face 51a and a side face 51c in the upstream / downstream direction of the stopping member 51. The first end face 51a is the upstream end face of the stopping member 51. The downstream end face of the stopping member 51 is the second end face 51b.

[0048] The stopping member 51 is provided so as to be rotatable about a rotating shaft 52. The stopping member 51 performs an upright motion by rotating counterclockwise in FIG. 15 (i.e., toward the upstream side), and performs a downright motion by rotating clockwise in FIG. 15 (i.e., toward the downstream side). The stopping member 51 is normally in a downright state (see FIG. 15), and in an emergency (i.e., when water has entered), it rotates from the downright state to stand up by the buoyancy generated by the entering water (see FIG. 17). That is, the stopping member 51 starts a standing up motion by utilizing the entering water, similar to the door body 10. Since the stopping member 51 is disposed on the lower surface side of the door body 10, the standing up motion of the stopping member 51 is limited within the lower area of ​​the door body 10 that is rising. Therefore, the stopping member 51 is practically raised up along with the standing up motion of the door body 10.

[0049] 17, when the stopping member 51 is in an upright state, the first end surface 51a is the lower end and the second end surface 51b is the upper end. That is, in the upright stopping member 51, the first end surface 51a is in surface contact with the bottom surface 18a of the storage section 18. When the door body 10 attempts to fall, it abuts (i.e., comes into contact with) the second end surface 51b of the upright stopping member 51, and the falling motion of the door body 10 is stopped.

[0050] More specifically, the door body 10 that has risen to an inclination angle θ equal to or greater than the predetermined angle θb hits the second end surface 51b of the rising stopping member 51, and is prevented from falling down to an inclination angle θ less than the predetermined angle θb (see FIG. 17). That is, during the rising operation of the door body 10, the door body 10 is prevented from falling down when the inclination angle θ falls from equal to or greater than the predetermined angle θb to less than the predetermined angle θb. Therefore, the swing of the door body 10 that has risen to an inclination angle θ equal to or greater than the predetermined angle θb and close to the predetermined angle θb is suppressed. The predetermined angle θb is set to a small value, for example, 5 degrees to 10 degrees.

[0051] In this embodiment, the lower surface 10c of the skin plate 10b of the door body 10 that is about to fall abuts against the second end surface 51b of the erected stopping member 51. More specifically, the stopping member 51 is disposed at a position where the tip portion 12 of the door body 10 that is about to fall abuts against it. That is, the lower surface 10c of the tip portion 12 of the skin plate 10b abuts against the second end surface 51b of the stopping member 51. As a result, the load that the stopping member 51 receives from the door body 10 when it hits against the door body 10 is reduced, compared to when the stopping member 51 hits a portion of the door body 10 that is closer to the base end side, for example.

[0052] Next, the return operation of the door body 10 that has been raised due to the intrusion of water will be described. The return operation of the door body 10 is an operation for returning the door body 10 to its normal fallen state. As described above, the raised door body 10 starts to fall as the water level drops. The falling door body 10 eventually hits the second end surface 40b of the stopping member 51 in the raised state, and the falling operation is stopped (the state shown in FIG. 17). Here, the return operation of the door body 10 is performed.

[0053] In this return operation, first, the above-mentioned forced erection operation of the door body 10 is performed. That is, the worker connects the first end portions 41a of the two wire ropes 41 to the connecting portion 14 of the door body 10, and connects the second end portions 41b of the two wire ropes 41 to the first hook 44b and the second hook 44c of the chain block 44. Then, the worker manually operates the chain block 44 to forcibly erect the door body 10 to a predetermined inclination angle θ.

[0054] Next, the condition of the storage section 18 (i.e., the area below the door body 10 that is to be lowered) is checked by an operator. Specifically, the operator checks whether there is any soil or driftwood that has flowed into the storage section 18 due to flooding. If there is soil or driftwood that may affect the lowering operation of the door body 10, the operator performs work to remove the soil, etc. Therefore, in the forced raising operation of the door body 10 that was performed earlier, the door body 10 is raised to an inclination angle θ at which work to remove the soil, etc. can be performed.

[0055] Next, the operation of lowering the stopping member 51 is performed. Specifically, the worker manually lowers the stopping member 51 to the downstream side. Next, the operation of lowering the door body 10 is performed. Specifically, the worker manually operates the chain block 44 to lower the door body 10 to its normal lowered state (the state shown in FIG. 1). That is, the worker pulls one of the two hand chains 44e, which is different from the hand chain 44e used when forcibly raising the door body 10, thereby lowering the door body 10. This completes the return operation of the door body 10.

[0056] As described above, the floating type rise-and-fall gate 1 of the embodiment includes the door body 10 and the stopping member 51. The door body 10 rotates around the base end side and stands up due to buoyancy caused by infiltrating water. The stopping member 51 is disposed on the underside of the door body 10 in the collapsed state, rotates and stands up due to the buoyancy as the door body 10 stands up, and stops the collapse of the door body 10 by hitting the second end surface 51b (upper end) of the door body 10 that is about to collapse.

[0057] According to the above-mentioned configuration, when the door body 10 is raised, the lowering motion of the door body 10 is restricted. Therefore, the swinging motion of the door body 10 when the door body 10 is raised can be restricted. Specifically, when the door body 10 is raised, the lowering motion of the door body 10 where the inclination angle θ is from a predetermined angle θb or more to less than the predetermined angle θb is restricted. Therefore, the swinging motion of the door body 10 raised to an inclination angle θ that is equal to or more than the predetermined angle θb and close to the predetermined angle θb can be restricted. As a result, the amount of overtopping during the raising motion of the door body 10 can be restricted.

[0058] Moreover, the stopping member 51 rotates and stands up due to buoyancy (i.e., buoyancy caused by intrusion of water) accompanying the standing operation of the door body 10. Therefore, the stopping member 51 can be easily and automatically set up, and the swinging of the door body 10 when it stands up can be easily and automatically suppressed.

[0059] Moreover, the amount of overtopping tends to be large when the water level is low (i.e., when the inclination angle θ of the door body 10 is small). In the above embodiment, the predetermined angle θb is set to a small value (e.g., 5 degrees to 10 degrees), so that the swing of the door body 10 when the water level is low can be suppressed. Therefore, the amount of overtopping can be effectively suppressed.

[0060] In the floating-type rise-and-fall gate 1 of the embodiment, the stopping member 51 is disposed at a position where it will come into contact with the tip portion 12 of the door body 10 that is about to fall down.

[0061] According to the above-mentioned configuration, the tip portion 12 of the door body 10 abuts against the second end surface 51b (upper end) of the erected stopping member 51. Therefore, compared to the case where the stopping member 51 abuts against a portion of the door body 10 closer to the base end side, for example, it is possible to reduce the load that the stopping member 51 receives from the door body 10 when the stopping member 51 abuts against the door body 10. Therefore, the strength required for the stopping member 51 can be reduced.

[0062] In the floating rise and fall gate 1 of the embodiment, the restraining member 51 is made of wood.

[0063] According to the above-mentioned configuration, the specific gravity of the stopping member 51 is relatively small, so that the stopping member 51 can be easily erected by buoyancy. Also, since the stopping member 51 is made of wood, it can be manufactured at a lower cost than, for example, a steel stopping member.

[0064] Other Embodiments As described above, the above embodiment has been described as an example of the technology disclosed in this application. However, the technology in this disclosure is not limited to this, and can be applied to embodiments in which modifications, replacements, additions, omissions, etc. are appropriately performed. In addition, it is also possible to combine the components described in the above embodiment to form a new embodiment. In addition, among the components described in the attached drawings and detailed description, not only components essential for solving the problem but also components that are not essential for solving the problem in order to exemplify the technology may be included. Therefore, the fact that these non-essential components are described in the attached drawings and detailed description should not immediately be taken to mean that these non-essential components are essential.

[0065] For example, although the stopping member 51 stands up by rotating counterclockwise in FIG. 15 (i.e., toward the upstream side), instead, it may stand up by rotating clockwise in FIG. 15 (i.e., toward the downstream side). Also, the stopping member 51 may stand up by rotating toward one side in the width direction of the door body 10. In this case, the stopping member 51 is disposed in a state extending in the width direction of the door body 10. In this way, the rotating direction of the stopping member 51 is not important as long as the stopping member 51 can stand up by rotating due to buoyancy generated by the infiltrating water.

[0066] Furthermore, the stopping member 51 is not limited to the shape described above, and may be formed, for example, in the shape of a polygonal column other than a rectangle, or in the shape of a circular column or an elliptical column.

[0067] Furthermore, in the falling prevention mechanism 50, the preventing member may be erected by a method other than buoyancy. For example, the falling prevention mechanism 50 may have a biasing member that biases the preventing member 51 in the rising direction. The preventing member 51 rotates in the rising direction and rises due to the biasing force of the biasing member. The preventing member 51 is disposed in a state in which it is rotated in the falling direction by the door body 10 against the biasing force of the biasing member. In other words, the rising operation of the preventing member 51 is restrained by the door body 10. Then, the preventing member 51 rotates and rises due to the biasing force of the biasing member in accordance with the rising operation of the door body 10.

[0068] Furthermore, the number of the anti-falling mechanisms 50 is not limited to that described above.

[0069] Moreover, the stopping member 51 may be made of resin (for example, hard polyurethane resin) or steel. [Industrial Applicability]

[0070] As described above, the technology of the present disclosure is useful for a floating relief gate. [Explanation of symbols]

[0071] 1. Floating boom gate 10 Door body 12 Tip 51 Restraining member 51b 2nd end surface (upper end)

Claims

1. A door body that is stored in a storage section in a collapsed state and that rotates and stands up around its base end due to buoyancy caused by ingress of water; a stopper member that is disposed on the underside of the door body in the collapsed state in the storage section, rotates and stands up due to the buoyancy as the door body stands up, and stops the collapse of the door body by hitting the door body that is about to collapse at an upper end thereof; The stopping member has an end surface that contacts the bottom of the storage section during a standing operation to restrict the rotation of the stopping member, and in a state in which the end surface contacts the bottom of the storage section and stands up, the door body comes into contact with the upper end, thereby restricting the collapse of the door body. A floating undulating gate characterized by:

2. The floating undulating gate according to claim 1, The stopping member is disposed at a position where the tip of the door body that is about to fall will come into contact with the stopping member. A floating undulating gate characterized by:

3. In the floating undulating gate according to claim 1 or 2, The restraining member is made of wood. A floating undulating gate characterized by:

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