JP7599397B2 - Floating type undulating gate - Google Patents

Description

The technology disclosed herein relates to a floating lift gate.

As a type of hoisting gate for preventing inundation due to floods and tsunamis, a floating hoisting gate in which the gate body rotates and stands up due to the buoyancy caused by the ingress of water, as disclosed in Patent Document 1, for example, has been known.

Patent No. 5948206

However, 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 falling. 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).

The technology disclosed herein has been developed in light of these circumstances, and its purpose is to provide a floating-type rise-and-fall gate that can suppress the swinging of the gate body when raised.

The floating-type rise-and-fall gate of the present disclosure comprises a door body and a stopper member. The door body rotates around the base end side and stands up due to the buoyancy caused by the 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 door body from collapsing by hitting its upper end against the door body that is about to collapse.

The floating-type rise-and-fall gate described above can suppress the swinging of the gate body when raised.

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

An exemplary embodiment is described in detail below with reference to the drawings.

The floating elevation gate 1 of this embodiment (hereinafter also simply referred to as elevation gate 1) is installed on road surface R (on 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 elevation gate 1 automatically performs raising and lowering movements by utilizing water that attempts to enter.

As shown in Figures 1 and 2, the rise-and-fall gate 1 comprises 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 the fall 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.

The door body 10 rotates and stands up due to the 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 that is 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 Figure 1).

The door body 10 stands up by rotating around the base end. Specifically, the door body 10 has a rotation shaft 11 on the base end 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) due to the buoyancy generated by the entering water. In other words, the door body 10 uses the entering water to start its standing up action.

In Fig. 1, water will infiltrate from the left side. In the following description, the "upstream side" and "downstream side" are defined as the upstream side (left side in Fig. 1) and downstream side (right side in Fig. 1) in the direction of water infiltration, and the "left-right direction" is defined as the right side facing downstream in the direction of water infiltration 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.

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

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 (more specifically, the skin plate 10b) in the lowered state constitutes 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.

The auxiliary drive unit 30 assists the door body 10 in standing up due to the buoyancy caused by the intrusion of water. More specifically, the auxiliary drive unit 30 has a function of assisting the door body 10 in standing up, and a function of mitigating the impact when standing up is completed and suppressing the door body 10 from suddenly falling down 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 standing angle of the door body 10.

Specifically, the auxiliary drive unit 30 has a counterweight 31, a wire rope 32, and a pair of fixed pulleys 33, 34. The auxiliary drive 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).

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

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 its lowest point when the inclination angle of the door body 10 relative to the horizontal plane reaches a predetermined angle (e.g., 45 degrees). The wire rope 32 is wound around the fixed pulley 33 and then the fixed pulley 34 from one end side (i.e., the door body 10 side).

As shown by the solid line graph in FIG. 3, when the door body 10 is raised, the counterweight 31 pulls the door body 10 in the raising direction to assist the raising operation until the inclination angle of the door body 10 reaches the specified 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 specified 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.

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 door body 10 is prevented from suddenly lowering, compared to when the auxiliary drive unit is not provided. Then, when the inclination angle of the door body 10 falls below the predetermined angle θa, the counterweight 31 acts as a resistance to the lowering motion of the door body 10, so the door body 10 lands later than when the auxiliary drive unit is not provided.

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.

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

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.

The first end 41a of each of the two wire ropes 41 is connected to both ends of the width of the door body 10. 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 width of the door body 10 in the collapsed state when the door body 10 is forced to stand up. More specifically, a connecting portion 14 is provided on the upper surface of the door body 10 in the collapsed 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 standing mechanism 40 forcibly stands up 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.

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 width of the door body 10. 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 that they can rotate freely. The pulley block 43 is an example of a redirecting pulley.

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, etc. 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.

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 the worker 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 up inside 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 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 inside the main body 44a by pulling the other hand chain 44e, and the hook distance is lengthened.

The forced standing mechanism 40 is disposed downstream of the door body 10. Specifically, the two fixed pulleys 42 and the two pulley blocks 43 are each 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 disposed below the fixed pulley 42.

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.

Next, the raising operation of the door body 10 when flooded will be described with reference to Figures 5 to 8. The forced raising mechanism 40 is not shown in Figures 5 to 8.

When water seeps into the door body 10 in the down position, the buoyancy caused by the inflowing water causes the door body 10 to start rising. At that time, as shown in FIG. 5, the door body 10 is subjected to a lifting force by the counterweight 31, so the door body 10 is pulled in the rising direction by the lifting force, assisting the rising motion. 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, assisting the rising motion. 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.

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 aligned in a straight line, and the counterweight 31 reaches its lowest point. 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. As shown in FIG. 8, when the inclination angle θ of the door body 10 reaches the rise completion angle (for example, 75 degrees), the door body 10 is in a completely risen state and the rise operation is completed. Thus, when the counterweight 31 is rising, the counterweight 31 acts as a resistance to the rise operation of the door body 10, and the overturning moment acting on the door body 10 increases. Therefore, the impact generated when the rise operation of the door body 10 is completed can be mitigated.

Next, the lowering operation of the gate body 10 when the water level drops will be described with reference to Figures 9 and 10. The forced standing mechanism 40 is not shown in Figures 9 and 10.

As shown in Figure 9, the door body 10 in an upright state begins to collapse as 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 in response to the falling 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.

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. 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 its 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, the door body 10 can be prevented from falling suddenly, and the impact generated when the falling motion is completed can be mitigated.

Next, the forced opening operation of the door body 10 will be explained with reference to Figures 11 to 14.

First, as shown in FIG. 11, the 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.

Then, the worker removes the chain block 44 from the pin 46. Then, as shown in FIG. 12, the worker connects the second ends 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 ends 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 where it is closer to the wire rope 41 connected to the first hook 44b than to the center of the width of the door body 10.

The worker then 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. In other words, the distance between the hooks is shortened. As a result, equal tension acts on the two wire ropes 41, and each of the two wire ropes 41 is pulled toward the center of the width of the door body 10. As a result, equal pulling forces act on the door body 10 from the two wire ropes 41. In other words, the door body 10 is pulled in the standing direction by the two wire ropes 41 and stands up. As the distance between the hooks is shortened, the main body 45a of the chain block 44 moves toward the center of the width of the door body 10.

Then, as shown in FIG. 13, 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, the door body 10 rises to the complete rise angle as shown in FIG. 14, and the forced rise operation is completed.

<Configuration and operation of the collapse prevention mechanism>
As shown in Figures 15 and 16, the rise-and-fall gate 1 further includes a fall-prevention mechanism 50. The fall-prevention mechanism 50 prevents the door body 10 from turning in the fall direction once it has turned in the upright direction during the rise-up operation of the door body 10. Note that the connecting parts 13 and 14 are not shown in Figures 15 and 16.

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

The stopping member 51 is disposed on the underside of the door body 10 in the collapsed state, and rotates and stands up as the door body 10 stands up, stopping the door body 10 from collapsing by hitting the second end surface 51b, which is the upper end, when the door body 10 tries to collapse.

Specifically, the stopping member 51 rotates and stands up due to the 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 underside of the door body 10 in the collapsed state. As shown in FIG. 15, the stopping member 51 is disposed in a collapsed state in the storage section 18. In other words, the stopping member 51 is disposed in a state in which it extends in the upstream and downstream directions (i.e., the direction in which water seeps in). In this embodiment, the stopping member 51 is made of wood.

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 the connection between the first end face 51a and the 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.

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 due to the buoyancy caused by the entering water (see FIG. 17). In other words, the stopping member 51, like the door body 10, starts its upright motion by using the entering water. Since the stopping member 51 is disposed on the underside of the door body 10, the upright 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 essentially stands up in conjunction with the upright motion of the door body 10.

As shown in FIG. 17, when the stopping member 51 is in an upright position, the first end surface 51a is the lower end and the second end surface 51b is the upper end. In other words, when the stopping member 51 is upright, 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 hits (i.e., comes into contact with) the second end surface 51b of the upright stopping member 51, thereby preventing the door body 10 from falling.

More specifically, the door body 10 that has risen to an inclination angle θ equal to or greater than the predetermined angle θb comes into contact with 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). In other words, when the door body 10 is rising up, 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 swinging of the door body 10 that has risen up 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.

In addition, in this embodiment, the second end surface 51b of the erected stopping member 51 abuts against the underside 10c of the skin plate 10b of the door body 10 that is about to collapse. More specifically, the stopping member 51 is disposed at a position where the tip 12 of the door body 10 that is about to collapse abuts against it. That is, the underside 10c of the tip 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 abuts against the door body 10 is reduced, compared to when the stopping member 51 abuts against a portion of the door body 10 closer to the base end side, for example.

Next, the return operation of the door body 10 that has been raised due to water intrusion 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 Figure 17). At this point, the return operation of the door body 10 is performed.

In this return operation, first, the door body 10 is forced to stand up as described above. That is, the worker connects the first ends 41a of the two wire ropes 41 to the connecting portion 14 of the door body 10, and connects the second ends 41b of the two wire ropes 41 to the first hook 44b and the second hook 44c of the chain block 44. The worker then manually operates the chain block 44 to force the door body 10 to stand up to the specified inclination angle θ.

Next, the worker checks the condition of the storage section 18 (i.e., the area below the door body 10 that is to be lowered). Specifically, the worker 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 could affect the lowering operation of the door body 10, the worker removes the soil, etc. For this reason, 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 the soil, etc. can be removed.

Then, the stopping member 51 is lowered. Specifically, the worker manually lowers the stopping member 51 toward the downstream side. Next, the door body 10 is lowered. 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, to lower the door body 10. This completes the return operation of the door body 10.

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 the buoyancy caused by the intrusion of water. The stopping member 51 is disposed on the underside of the door body 10 in the collapsed state, and rotates and stands up due to the buoyancy as the door body 10 stands up, stopping 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.

According to the above configuration, when the door body 10 is raised, the door body 10 is prevented from falling down. Therefore, the swinging of the door body 10 when it is raised can be suppressed. Specifically, when the door body 10 is raised, the door body 10 is prevented from falling down when the inclination angle θ becomes less than the predetermined angle θb from a predetermined angle θb or more. Therefore, the swinging of the door body 10 that is raised to an inclination angle θ that is equal to or greater than the predetermined angle θb and close to the predetermined angle θb can be suppressed. As a result, the amount of overtopping can be suppressed when the door body 10 is raised.

In addition, the stopping member 51 rotates and stands up due to buoyancy (i.e., buoyancy caused by water intrusion) as the door body 10 stands up. 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.

In addition, the amount of overtopping tends to be greater when the water level is low (i.e., when the inclination angle θ of the gate body 10 is small). In the above embodiment, the specified angle θb is set to a small value (e.g., 5 degrees to 10 degrees), so that the swinging of the gate body 10 when the water level is low can be suppressed. Therefore, the amount of overtopping can be effectively suppressed.

In addition, in the floating elevation gate 1 of the above embodiment, the stopping member 51 is positioned at a position where it will come into contact with the tip 12 of the door body 10 that is about to collapse.

According to the above configuration, the tip 12 of the door body 10 abuts against the second end surface 51b (upper end) of the erected stopping member 51. Therefore, the load received from the door body 10 when the stopping member 51 abuts against the door body 10 can be reduced, compared to when the stopping member 51 abuts against a portion of the door body 10 closer to the base end side, for example. Therefore, the strength required for the stopping member 51 can be reduced.

In addition, in the floating elevation gate 1 of the above embodiment, the restraining member 51 is made of wood.

With the above-mentioned configuration, the specific gravity of the stopping member 51 is relatively small, so the stopping member 51 can be easily erected by buoyancy. In addition, since the stopping member 51 is made of wood, it can be manufactured more inexpensively than, for example, a stopping member made of steel.

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.

For example, while the stopping member 51 stands up by rotating counterclockwise in FIG. 15 (i.e., toward the upstream side), it may instead stand up by rotating clockwise in FIG. 15 (i.e., toward the downstream side). The stopping member 51 may also 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 that extends in the width direction of the door body 10. In this way, as long as the stopping member 51 can stand up by rotating due to the buoyancy generated by the infiltrating water, the rotation direction of the stopping member 51 is not important.

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 square, or in the shape of a circular cylinder or an elliptical cylinder.

In addition, in the collapse prevention mechanism 50, the prevention member may be erected by a method other than buoyancy. For example, the collapse prevention mechanism 50 may have a biasing member that biases the prevention member 51 in the erecting direction. The prevention member 51 rotates in the erecting direction and stands up due to the biasing force of the biasing member. The prevention member 51 is arranged in a state in which it is rotated in the collapsed direction by the door body 10 against the biasing force of the biasing member. In other words, the erecting movement of the prevention member 51 is restrained by the door body 10. Then, the prevention member 51 rotates and stands up due to the biasing force of the biasing member as the door body 10 stands up.

In addition, the number of fall prevention mechanisms 50 is not limited to that described above.

The stopping member 51 may be made of resin (e.g., hard polyurethane resin) or steel.

As explained above, the technology disclosed herein is useful for floating elevation gates.

1 Floating type rise and fall gate 10 Gate body 12 Tip portion 51 Stop member 51b Second end surface (upper end)

Claims (3)

A door body that is stored in a storage section in a collapsed state and that rotates and stands up around a base end side 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: The floating undulating gate according to claim 1,
A floating rise and fall gate characterized in that the restraining member is arranged at a position where the tip of the door body will hit when it is about to collapse. In the floating undulating gate according to claim 1 or 2,
A floating undulating gate, characterized in that the restraining member is made of wood.

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