TWI842964B - Gate - Google Patents

Abstract

The undulating gate 1 of the present invention includes: a gate body 10 for opening and closing an opening 91; a closing mechanism 30 for closing the opening 91 of the gate body 10; and a float 54 for detecting a water level. The gate body 10 is configured in such a manner that the opening 91 is opened in normal times to allow water to flow between the first water area A and the second water area B, and the opening 91 is closed in an emergency when the water level of the first water area A increases and it is necessary to prevent the flow of water from the first water area A to the second water area B. When the closing mechanism 30 prevents the flow of water from the first water area A to the second water area B in an emergency, the opening 91 is closed by setting the gate body 10 to a closed state when the water level detected by the float 54 rises and reaches a predetermined water level. The buoy 54 detects the water level of the second water area B by detecting the water level of a water area in the second water area B that is separated from the water area formed by extending the opening 91 .

Description

Gate

The technology disclosed herein is related to a gate arranged at an opening that connects a first water area with a second water area.

A gate that is disposed at an opening and opens and closes the opening has been known for a long time. For example, Patent Document 1 discloses a gate that opens and closes a drainage passage. The gate is constructed in a manner that opens and closes based on the water level difference between the upstream side and the downstream side of the gate.

[Prior art literature]

[Patent Literature]

[Patent document 1] Japanese Patent Publication No. 2-80708

In a gate that opens and closes an opening, it is necessary to accurately determine the necessity of closing the opening. Furthermore, the criteria for opening and closing the gate differ depending on the use of the gate. For example, sometimes the gate is opened and closed based only on the water level of a certain water area, not based on the water level difference between the upstream and downstream of the gate.

The technology disclosed here is completed in view of the above aspects, and its purpose is not to close the opening according to the water level difference between the upstream and downstream of the gate, but only according to the water level, and accurately determine the necessity of closing the opening.

The object of the technology disclosed here is a gate installed at an opening that connects a first water area with a second water area. The gate includes: a door body that opens and closes the opening; a closing mechanism that causes the door body to close the opening; and a water level detection unit that detects the water level, and the door body is constructed in the following manner: in normal times, the opening is opened to allow water to flow between the first water area and the second water area, and on the other hand, when the water level of the first water area increases and it is necessary to prevent the flow of water from the first water area to the second water area, the door body is in an open state to open the opening to allow water to flow between the first water area and the second water area. The closing state of the opening is closed. When the closing mechanism prevents the flow of water from the first water area to the second water area in the emergency, when the water level detected by the water level detection unit rises and reaches a specified water level, the opening is closed by setting the door body to the closed state. The water level detection unit detects the water level of the second water area by detecting the water level of the water area that deviates from the water area formed by extending the opening in the second water area.

According to the gate, the opening can be closed based on the water level instead of the water level difference between the upstream and downstream of the gate, and the necessity of closing the opening can be accurately determined.

1: Up and down gate (gate)

3: Closing mechanism

9: Embankment

10: Door body

11: Rotation axis

13: Snap-fit section

20: Storage Department

30: Retention institution

31: Hook (engagement part)

32: Sales

33: Axis

34: Heavy Hammer

35: Hydraulic cylinder

35a: Piston rod

40: Delivery mechanism

41: First shot

42: Second shot

43: Third pole

44: First connecting rod

45: Second connecting rod

46: Rope

47: Pulley (movable pulley)

48: Spring mechanism

50: Hydraulic circuit

51: First valve

52: Second valve

53: Check valve

54: buoy (water level detection unit)

55: Supply pipe

56: First discharge pipe

57: Second discharge pipe

58: Combined pipe

59: Control Department

61: First side wall

62: Second side wall

63: Machinery room

64: Water storage room

65: Aqueduct

91: Open mouth

100: Heaving gate breakwater

A: The first water area

B: Second water area

b1: The water area formed by extending the opening

b2: The water area that deviates from the water area formed by extending the opening

b3: The water area on the opposite side of the gate

Figure 1 is an overview of a port with a heaving gate breakwater.

Figure 2 is a schematic cross-sectional view of the heave gate in a fallen state.

FIG3 is a diagram showing the schematic structure of the closing mechanism.

Below, the exemplary implementation form is described in detail based on the drawings. FIG. 1 is an overview of a port equipped with a heaving gate breakwater 100. FIG. 2 is a schematic cross-sectional view of the heaving gate 1 in a fallen state. FIG. 3 is a diagram showing the schematic structure of the closing mechanism 3.

For example, the heaving gate breakwater 100 is installed in the ocean, more specifically in a harbor, as a countermeasure against tsunamis or high tides. The heaving gate breakwater 100 is configured to separate the first water area A from the second water area B. For example, the second water area B is a closed water area surrounded by land and the like. When the heaving gate breakwater 100 is installed in a harbor, the water area outside the harbor is the first water area A, and the water area inside the harbor is the second water area B.

The undulating gate type breakwater 100 includes: an undulating gate 1, and a dam body 9.

The dike body 9 is formed with an opening 91 that connects the first water area A and the second water area B. The fluctuating gate 1 is disposed at the opening 91.

As shown in Figures 2 and 3, the fluctuating gate 1 includes: a door body 10, which opens and closes the opening 91; a closing mechanism 3, which closes the opening 91 with the door body 10; and a float 54, which detects the water level. As shown in Figure 1, the fluctuating gate 1 may further include a first side wall 61 and a second side wall 62, which are arranged in a manner facing each other and divide the opening 91. The fluctuating gate 1 is an example of a gate, and the float 54 is an example of a water level detection unit.

As shown in FIG1 , the door body 10 is disposed between the first side wall 61 and the second side wall 62. The number of door bodies 10 can be set arbitrarily. In the example, the up-and-down gate 1 has four door bodies 10. The four door bodies 10 are arranged between the first side wall 61 and the second side wall 62.

As shown in FIG2 , the door body 10 is configured to rotate between a lying state (see solid line) in which the opening 91 is opened and an erected state (see one-point chain line) in which the opening 91 is closed. Specifically, the door body 10 has a rotation axis 11. For example, the door body 10 is formed into a substantially rectangular flat plate. The rotation axis 11 is disposed in a portion of the door body 10 corresponding to one side of the rectangle. The door body 10 rotates around the rotation axis 11, rotating between a lying state and an erected state. The rotation axis 11 is disposed in the water (i.e., in the sea). As shown in FIG1 , a plurality of (four) door bodies 10 are arranged in a manner that the rotation axis 11 is arranged side by side in a straight line.

In the fallen state, the entire door body 10 is submerged in the water. In the fallen state, the door body 10 is fallen in a manner such that the rotation axis 11 in the door body 10 is on the second water area B side, and the end of the door body 10 on the opposite side to the rotation axis 11 is on the first water area A side (see Figure 1). In the upright state, the door body 10 is partially protruding above the water (see Figure 2) and the opening 91 is closed. An air chamber (not shown) is formed inside the door body 10. The door body 10 rotates from the fallen state to the upright state by the buoyancy exerted on the door body 10.

As shown in FIG. 2 , a storage section 20 for storing the door body 10 in a fallen state is formed at the bottom of the water (i.e., the seabed). The storage section 20 is formed in a box shape with an opening at the top. The plane shape of the storage section 20 is roughly rectangular and slightly larger than the door body 10. In the example described, a common storage section 20 is provided for four door bodies 10.

When the water level detected by the buoy 54 reaches a predetermined water level, the closing mechanism 3 causes the door body 10 to close the opening 91 while preventing the water from flowing from the first water area A to the second water area B. In the example described above, the closing mechanism 3 includes: a retention mechanism 30 for retaining the door body 10 in a fallen state; and a hydraulic circuit 50 for operating the retention mechanism 30. That is, the closing mechanism 3 retains the door body 10 in a fallen state, and on the other hand, by releasing the retention, the door body 10 rotates to an upright state by buoyancy, thereby closing the opening 91. Furthermore, in addition to the water level detected by the buoy 54, the closing mechanism 3 also causes the door body 10 to close the opening 91 based on external notifications or operator operations.

As shown in FIG3 , the tie-down mechanism 30 includes: a hook 31 that engages with the door body 10 in the fallen state; and a hydraulic cylinder 35 that drives the hook 31. Furthermore, the tie-down mechanism 30 includes a transmission mechanism 40 that transmits the power of the hydraulic cylinder 35 to the hook 31. The hook 31 is driven by the hydraulic cylinder 35 via the transmission mechanism 40. The hook 31 is an example of an engaging portion.

A pin 32 is provided on the hook 31. The hook 31 has a shaft 33 and is rotatably provided around the shaft 33. The hook 31 is engaged with the engaging portion 13 provided on the door body 10 by rotating. Specifically, the hook 31 rotates in one direction (clockwise in FIG. 3, hereinafter referred to as the "engaging direction") of the circumferential direction around the shaft 33, and engages with the engaging portion 13 of the door body 10 in the fallen state from above. A counterweight 34 is provided on the hook 31 to rotate the hook 31 in the other direction (counterclockwise in FIG. 3, hereinafter referred to as the "releasing direction") of the circumferential direction around the shaft 33.

The transmission mechanism 40 has: a first rod 41, a second rod 42, a third rod 43, a first link 44, a second link 45, a wire 46, a pulley 47 (movable pulley), and a spring mechanism 48.

One end of the first rod 41 is connected to the pin 32 of the hook 31. The hook 31 rotates in the engagement direction by being pulled by the first rod 41.

The other end of the first rod 41 is connected to the first link 44. One end of the second rod 42 is also connected to the first link 44. The other end of the second rod 42 is connected to the second link 45. One end of the third rod 43 is also connected to the second link 45. A rope 46 is connected to the other end of the third rod 43. The other end of the rope 46 is connected to the spring mechanism 48. The rope 46 is wound around the pulley 47. That is, the first rod 41, the first link 44, the second rod 42, the second link 45, the third rod 43, the rope 46 and the spring mechanism 48 are connected to the hook 31 in order. In the example of FIG. 3, the first rod 41 and the third rod 43 are arranged so as to extend in a substantially vertical direction. The second rod 42 is arranged to extend in a substantially horizontal direction. The first link 44 and the second link 45 are formed in a bell crank shape.

The pulley 47 is mounted on the front end of the piston rod 35a of the hydraulic cylinder 35, and moves in accordance with the forward and backward movement of the piston rod 35a. In the example of FIG. 3 , the piston rod 35a is configured to move forward and backward in the vertical direction.

The hydraulic cylinder 35 is connected to a hydraulic circuit 50, through which oil is supplied or discharged.

A portion of the closing mechanism 3 is disposed in a mechanical chamber 63 provided in the first side wall 61. Specifically, at least the hydraulic cylinder 35, the pulley 47, the spring mechanism 48 and the hydraulic circuit 50 are disposed in the mechanical chamber 63.

In the closing mechanism 3 thus constructed, when oil is supplied to the hydraulic cylinder 35, the piston rod 35a advances (moves upward). The pulley 47 also moves in conjunction with the piston rod 35a, and the hook 31 rotates in the engagement direction via the first rod 41, the second rod 42, the third rod 43, the first connecting rod 44, the second connecting rod 45, and the rope 46. Thereby, the hook 31 is engaged with the engaging portion 13 of the door body 10 in the fallen state. By the hook 31 being engaged with the engaging portion 13, the door body 10 is tied in the fallen state. On the other hand, when the pressure of the hydraulic cylinder 35 is released, the pulling force on the hook 31 is released. Thereby, the door body 10 is continuously rotated toward the upright state by the buoyancy. At this time, as the door body 10 rotates, the engagement of the hook 31 with the engagement portion 13 is released.

Furthermore, the force caused by waves that causes the door body 10 to swing up and down can act on the door body 10 in the fallen state. When the door body 10 is moored in the fallen state, the mooring mechanism 30 allows the door body 10 to swing due to waves within the range of not releasing the mooring of the door body 10 by the expansion and contraction action of the spring mechanism 48. For example, when the water level is lowered by waves, the door body 10 wants to rotate upward. At this time, the spring mechanism 48 is extended, and the first rod 41, the second rod 42, the third rod 43, the first connecting rod 44, the second connecting rod 45 and the rope 46 are displaced in the direction shown by the solid arrow in Figure 3. As a result, the door body 10 can rotate upward. On the other hand, when the water level rises due to waves, the door body 10 wants to rotate downward. Since the hook 31 only restricts the upward rotation of the door body 10, the door body 10 rotates downward. At this time, the spring mechanism 48 contracts, and the first rod 41, the second rod 42, the third rod 43, the first connecting rod 44, the second connecting rod 45 and the rope 46 are displaced in the direction indicated by the dotted arrow in Figure 2. In this way, the slack of the rope 46 is absorbed, and the hook 31 is kept engaged with the engaging portion 13. The extension and contraction range of the spring mechanism 48 is set to a range that does not release the hook 31 from the engaging portion 13. Therefore, even if the door body 10 swings, the door body 10 is still kept.

The hydraulic circuit 50 is further described. The hydraulic circuit 50 includes at least a first valve 51 and a second valve 52. Specifically, the hydraulic circuit 50 includes a supply pipe 55, a first discharge pipe 56, a second discharge pipe 57, and a confluence pipe 58. The supply pipe 55 and the first discharge pipe 56 are connected to the confluence pipe 58. The second discharge pipe 57 and the confluence pipe 58 are connected to the hydraulic cylinder 35. A check valve 53 is provided on the supply pipe 55, and the check valve 53 allows oil to flow to the confluence pipe 58 and blocks the flow of oil from the confluence pipe 58. The first valve 51 and the second valve 52 are configured to be switchable between a closed state that blocks the discharge of oil from the hydraulic cylinder 35 and an open state that allows the discharge of oil from the hydraulic cylinder 35. When the first valve 51 and the second valve 52 are in the closed state, the discharge of oil from the hydraulic cylinder 35 is stopped. The first valve 51 and the second valve 52 are set to the closed state, and the oil is supplied to the hydraulic cylinder 35 through the supply pipe 55 and the confluence pipe 58, so that the piston rod 35a advances. When at least one of the first valve 51 and the second valve 52 is in the open state, the oil can be discharged from the hydraulic cylinder 35. Thereby, the pulling force on the hook 31 through the rope 46 and the like is released. The hook 31 rotates in the release direction due to the buoyancy of the door body 10, and the piston rod 35a moves backward accordingly.

The condition for the first valve 51 to switch from the closed state to the open state (hereinafter referred to as the "first switching condition") is different from the condition for the second valve 52 to switch from the closed state to the open state (hereinafter referred to as the "second switching condition")

For example, the first valve 51 is a valve generally used for the release operation of the hook 31, and is controlled by the control unit 59. For example, the first valve 51 is an electromagnetic shut-off valve, and operates based on an instruction from the control unit 59. The control unit 59 receives a notification from the outside or an operation by an operator and outputs an instruction to the first valve 51. That is, the first switching condition is an instruction to switch to the open state input from the control unit 59.

For example, the second valve 52 is a backup valve for the first valve 51. The second valve 52 operates independently of the first valve 51. For example, the second valve 52 is a mechanical shut-off valve. The second valve 52 is mechanically driven according to the water level of the specified water area. The so-called "mechanical" and "mechanically" mean a component that is not driven by electricity. The second valve 52 is mechanically connected to the float 54 via one or more levers or connecting rods. The second valve 52 is linked to the displacement of the float 54 to mechanically switch the closed state and the open state.

The buoy 54 detects the water level of the second water area B. For example, the buoy 54 is arranged in the water storage chamber 64 in the first side wall 61. A water pipe 65 is connected to the water storage chamber 64. As shown in FIG1 , one end of the water pipe 65 (the end on the opposite side to the water storage chamber 64) opens toward the second water area B. In addition, the water storage chamber 64 is open to the atmosphere. In the water storage chamber 64, water is introduced from the water area where one end of the water pipe 65 is located. The water level of the water storage chamber 64 is roughly the same as the water level of the water area where one end of the water pipe 65 opens. That is, the buoy 54 detects the water level of the second water area B (specifically, the water area b2, more specifically, the water area b3). That is, water from the water area of the detection object detected by the buoy 54 is introduced into the water storage chamber 64.

Preferably, the buoy 54 detects the water level of the water area b2 in the second water area B that deviates from the water area b1 formed by extending the opening 91 (the water area enclosed by a one-point chain in FIG1 ). In the example of FIG3 , the buoy 54 detects the water level of the water area b3 in the second water area B that is on the opposite side of the first side wall 61 and the door body 10 .

Specifically, one end of the water pipe 65 opens in the second water area B toward the water area b2 which is away from the water area b1 formed by extending the opening 91. More specifically, one end of the water pipe 65 opens in the second water area B toward the water area b3 which is on the opposite side of the first side wall 61 and the door body 10. That is, the water level of the water storage chamber 64 is roughly the same as the water level of the second water area B (specifically, the water area b2, more specifically, the water area b3).

The buoy 54 is located above the water surface of the water storage chamber 64 at normal times, that is, at normal tides, and is not immersed in the water surface. When the water level of the water storage chamber 64 reaches a prescribed water level exceeding the normal high tide, the buoy 54 is immersed in the water surface of the water storage chamber 64 and floats up with the rise of the water level. When the water level of the water storage chamber 64 reaches a prescribed water level that requires the opening 91 to be closed, the buoy 54 mechanically drives the second valve 52 to set the second valve 52 to an open state. That is, the second switching condition is that the water level detected by the buoy 54 reaches a prescribed water level.

The operation of the thus constructed up-and-down gate 1 is explained.

Normally, the door body 10 is locked by the locking mechanism 30 in a fallen state. The opening 91 is opened, and water (i.e., seawater) flows between the first water area A and the second water area B through the opening 91. Here, the so-called normal time means a situation where the opening 91 does not need to be closed, such as a situation where a normal tide is generated.

Specifically, the door body 10 is in a fallen state, and oil is supplied to the hydraulic cylinder 35 through the hydraulic circuit 50. At this time, the first valve 51 and the second valve 52 are in a closed state. The piston rod 35a of the hydraulic cylinder 35 advances (moves upward) by the supply of oil, and accordingly, the hook 31 rotates in the engagement direction through the transmission mechanism 40. The hook 31 engages with the engagement portion 13 of the door body 10 in the fallen state. As a result, the door body 10 is tied in a fallen state.

On the other hand, in an emergency such as a high tide or a tsunami, when the opening 91 needs to be closed, the control unit 59 releases the mooring implemented by the mooring mechanism 30, so that the door body 10 changes from a collapsed state to an up-and-down state. Specifically, when a tsunami or a high tide occurs, the control unit 59 receives a notification from the outside. Based on the notification from the outside, the control unit 59 outputs a command to the first valve 51 to switch the first valve 51 from a closed state to an open state. Alternatively, in the event of a tsunami or a high tide, the operator operates the control unit 59. Based on the operator's operation, the control unit 59 outputs a command to the first valve 51 to switch the first valve 51 from a closed state to an open state.

When the first valve 51 is in the open state, the pressure of the hydraulic cylinder 35 is released. Thus, the pulling force on the hook 31 through the transmission mechanism 40 is released. The door body 10 continuously rotates toward the upright state by buoyancy. Along with this, the hook 31 rotates in the release direction, and the engagement of the hook 31 with the engagement part 13 is released. Finally, the door body 10 closes the opening 91, preventing the flow of water from the first water area A to the second water area B.

The above is the basic operation of the undulating gate 1. However, the following situation may occur: although it is necessary to prevent the flow of water from the first water area A to the second water area B, the mooring of the gate body 10 is not released by the control unit 59. For example, in the case where it is necessary to prevent the flow of water from the first water area A to the second water area B due to an event other than the pre-conceived event such as a tsunami or a high tide, a notification from the outside may not be sent to the control unit 59. Similarly, a notification from the outside may not be sent to the operator. Or, when a malfunction occurs in the control unit 59, the mooring of the gate body 10 implemented by the control unit 59 cannot be released.

In order to cope with such a situation, the ups and downs gate 1 includes a second valve 52 as a backup valve. The second valve 52 switches from a closed state to an open state according to the water level of the second water area B. The water level for switching to the open state is a water level at which it can be determined that the opening 91 needs to be closed, for example, a water level slightly lower than a water level at which damage may occur in the second water area B or the land connected to the second water area B. Specifically, the buoy 54 detects the water level of the second water area B, and when the water level reaches a specified water level, the second valve 52 switches to the open state. Thereby, the oil in the hydraulic cylinder 35 can be discharged, and the pulling force on the hook 31 can be released. The hook 31 is released from the door body 10, and the door body 10 is continuously rotated to the upright state by buoyancy. The second valve 52 works independently of the first valve 51. That is, even if the first valve 51 is in a closed state, when the water level reaches a specified level, the second valve 52 will also be in an open state.

In this way, even if the mooring release is not executed under the control of the control unit 59, when the second water area B reaches the specified water level, the second valve 52 is switched to the open state, and the opening 91 is closed by the door body 10.

At this time, the second valve 52 switches from the closed state to the open state according to the water level of the second water area B, not according to the water level of the first water area A. In determining whether it is necessary to prevent the flow of water from the first water area A to the second water area B, at first glance, it would be better to monitor the water level of the upstream side, that is, the first water area A, so that it can be dealt with earlier. However, the first water area A is more upstream than the second water area B and before passing through the opening 91, so although the change in water level (specifically, the rise) appears earlier, the change range is large, and it is difficult to accurately determine the necessity of closing the opening 91. In contrast, the water surface of the second water area B after passing through the opening 91 is more stable than that of the first water area A, so it is easy to accurately detect the water level. In addition, what is intended to be protected by closing the opening 91 is the second water area B or the land connected to the second water area B. Therefore, the necessity of protection can be accurately determined by monitoring the water level of the second water area B instead of the first water area A.

Furthermore, the second valve 52 is switched to an open state according to the water level of the water area b2 in the second water area B, which is separated from the water area b1 formed by extending the opening 91. The water area b1 formed by extending the opening 91 in the second water area B has a tendency that the flow rate of water flowing from the first water area A into the second water area B is fast and the water level is lowered. That is, the water area b2 separated from the water area b1 is more stable than the water area b1. By monitoring the water level of the water area b2, the necessity of protection can be determined more accurately.

More specifically, the second valve 52 switches to an open state according to the water level of the water area b3 on the opposite side of the first side wall 61 and the door body 10 in the water area b2. The first side wall 61 is partially divided into an opening 91, and the side of the door body 10 opposite to the first side wall 61 is the opening 91. The first side wall 61 prevents the water flowing in the opening 91 from flowing into the water area b3 on the opposite side of the door body 10. In order to flow into the water area b3 on the opposite side of the first side wall 61 and the door body 10, the water flowing in the opening 91 must bypass the first side wall 61. The water area b3 is not easily affected by the water flowing in the opening 91. That is, the water area b3 is relatively stable even in the water area b2. Therefore, by monitoring the water level of the water area b3, the necessity of protection can be more accurately determined.

Furthermore, by providing the first valve 51 and the second valve 52, the conditions for switching the first valve to the open state can be different from the conditions for switching the second valve 52 to the open state. For example, even when the first valve 51 does not release the door body 10, if the second switching condition of the second valve 52 is satisfied, the second valve 52 can release the door body 10 and use the door body 10 to close the opening 91. That is, more phenomena can be captured, and the opening 91 can be closed according to the phenomena.

Furthermore, the second valve 52 is mechanically driven in response to the water level detected by the float 54. Therefore, even if a power outage or a malfunction of the control unit 59 occurs, the second valve 52 can still operate normally, and the door body 10 can be used to close the opening 91.

As described above, the fluctuating gate 1 includes: a gate body 10, which opens and closes the opening 91; a closing mechanism 3, which closes the opening 91 by the gate body 10; and a buoy 54 (water level detection unit) which detects the water level. When the closing mechanism 3 prevents the flow of water from the first water area A to the second water area B, when the water level detected by the buoy 54 reaches a specified water level, the gate body 10 closes the opening 91, and the buoy 54 detects the water level of the second water area B.

According to the structure, the door body 10 closes the opening 91 based on the water level of the second water area B instead of the water level of the first water area A. The second water area B after passing through the opening 91 is more stable than the first water area A before passing through the opening 91. Therefore, by monitoring the water level of the second water area B, the necessity of closing the opening 91 can be accurately determined.

In addition, the buoy 54 detects the water level of the water area b2 which is separated from the water area b1 formed by extending the opening 91 in the second water area B.

According to the structure, even in the second water area B, the closing of the opening 91 is determined based on the water level of the more stable water area. That is, in the water area b1 formed by extending the opening 91 in the second water area B, water flows from the first water area A into the second water area B. The water surface of the water area b1 changes according to the flow rate. Therefore, the water area b2 deviating from the water area b1 is more stable than the water area b1. By monitoring the water level of the water area b2, the necessity of closing the opening 91 can be determined more accurately.

Furthermore, the fluctuating gate 1 further includes a first side wall 61 and a second side wall 62 arranged in a manner facing each other and demarcating the opening 91, the gate body 10 is arranged between the first side wall 61 and the second side wall 62, and the buoy 54 detects the water level of the water area b3 in the second water area B which is on the opposite side of the first side wall 61 and the gate body 10.

According to the above structure, the closing of the opening 91 is determined based on the water level of the more stable water area in the second water area B. That is, the water area b3 is not easily affected by the water flowing in the opening 91. Therefore, by monitoring the water level of the water area b3, the necessity of closing the opening 91 can be determined more accurately.

Furthermore, the door body 10 is configured to rotate between a lying state with the opening 91 opened and an upright state with the opening 91 closed, and the door body 10 rotates from the lying state to the upright state due to the buoyancy received by the door body 10.

According to the structure, the fluctuating gate 1 is a type of gate that rotates from a fallen state to an upright state by the buoyancy of the door body 10. Compared with a slide gate or a roller gate, the fluctuating gate 1 closes the opening 91 faster. Therefore, the timing of determining the closing of the opening 91 can be postponed. In this way, the necessity of closing the opening 91 can be determined more accurately.

In addition, the closing mechanism 3 comprises: a retention mechanism 30, which retains the door body 10 in the inverted state; and a hydraulic circuit 50, which operates the retention mechanism 30. The retention mechanism 30 comprises: a hook 31 (engaging portion), which engages with the door body 10 in the inverted state; and a hydraulic cylinder 35, which drives the hook 31. The hydraulic circuit 50 comprises: a first valve 51, which is controlled by a control unit 59 and can be automatically The hydraulic cylinder 35 discharges oil; and the second valve 52 is mechanically driven according to the water level detected by the float 54, and can discharge oil from the hydraulic cylinder 35. When the water level detected by the float 54 reaches a specified water level, the second valve 52 can discharge oil from the hydraulic cylinder 35 to release the engagement of the hook 31 with the door body 10, thereby rotating the door body 10 from the inverted state to the upright state.

According to the structure, the closing mechanism 3 closes the opening 91 of the door body 10 by releasing the engagement of the hook 31 with the door body 10. In detail, the closing mechanism 3 has two valves, namely, the first valve 51 and the second valve 52, for releasing the engagement of the hook 31 with the door body 10. The first valve 51 is controlled by the control unit 59. On the other hand, the second valve 52 is mechanically driven according to the water level detected by the float 54. Therefore, the second valve 52 functions as a backup valve for the first valve 51. That is, even if the first valve 51 does not work for some reason, when the water level reaches a specified water level, the second valve 52 releases the engagement of the hook 31 with the door body 10. As a result, the opening 91 can be closed using the door body 10 according to various conditions.

《Other implementation forms》

As described above, the implementation form is described as an example of the technology disclosed in this application. However, the technology disclosed in this application is not limited to this, and can also be applied to implementation forms that have been appropriately changed, replaced, added, omitted, etc. In addition, the various components described in the implementation form can also be combined to form a new implementation form. In addition, the components recorded in the attached drawings and detailed descriptions include not only components necessary to solve the problem, but also components that are not necessary to solve the problem in order to illustrate the technology. Therefore, it should not be immediately recognized that the non-essential components are necessary because they are recorded in the attached drawings or detailed descriptions.

For example, the gate is not limited to being installed in a harbor. The gate can also be installed in a river or an estuary. In addition, the gate may not form a gate-type breakwater together with the dike 9. That is, the gate is not installed in the opening of the dike, but in the river or the estuary, it is installed in an opening divided by the opposite side walls such as the first side wall and the second side wall.

The gate is not limited to a gate that rotates between a lying state and an upright state, i.e., a lifting gate. The gate may also be a sliding gate or a roller gate, etc.

The lifting gate 1 has four door bodies 10, but the number of door bodies 10 is not limited thereto. The number of door bodies 10 may also be one, two, three, or more than five.

The water level detection unit is not limited to the buoy 54. The water level detection unit may also be a water level sensor, for example. The water level detection unit is not limited to detecting the water level of the water storage chamber 64. The water level detection unit (for example, the buoy 54) may also be directly configured in the second water area B (for example, water area b3).

The water area where the water level detection unit detects the water level is not limited to the water area b3. The water area where the water level detection unit detects the water level can be the second water area B. However, from the perspective of detecting the water level in a water area with small water level changes, the water area b2 is preferred, and the water area b3 is more preferred.

The closing mechanism 3 is not limited to the above-mentioned structure. For example, the transmission mechanism 40 can be set to any structure as long as it can transmit the power of the hydraulic cylinder 35 to the hook 31. In addition, the driving source of the hook 31 is not limited to the hydraulic cylinder 35, but can also be a motor. In addition, as long as the door body 10 can be tied and untied, any component can be used to replace the hook 31. In addition, as described above, when the gate is a sliding gate or a roller gate, a closing mechanism corresponding to the gate type is used. In addition, the closing mechanism only needs to have the function of making the door body 10 close the opening 91, and the function of keeping the door body 10 in the open state of the opening 91 is not necessary for the closing mechanism.

Furthermore, the first valve 51 may not be provided on the gate. That is, the closing mechanism 3 may not have the first valve 51 but only have the second valve 52. In this case, the door body 10 operates in a manner that closes the opening 91 based on the water level detected by the water level detection unit, rather than based on external notification or operator operation.

[Industrial availability]

As described above, the technology disclosed herein is useful for gates.

1: Up and down gate (gate)

9: Embankment

10: Door

11: Rotation axis

61: First side wall

62: Second side wall

64: Water storage room

65: Aqueduct

91: Open

100: Heaving Gate Breakwater

A: First Water Area

B: Second Water Area

b1: Water area formed by extending the opening

b2: The water area that deviates from the water area formed by extending the opening

b3: The water area on the opposite side of the gate

Claims (3)

A gate is provided at an opening that connects a first water area with a second water area, and comprises: a door body that opens and closes the opening; a closing mechanism that closes the door body; a water level detection unit that detects the water level; and a first side wall and a second side wall that are arranged in a manner facing each other, and the opening is divided between the first side wall and the second side wall by the mutually facing wall surfaces of the first side wall and the second side wall, and the door body is arranged between the first side wall and the second side wall, and is configured such that: the opening is normally opened so that water can flow between the first water area and the second water area, and the water level in the first water area increases and needs to be blocked. In an emergency to stop the flow of water from the first water area to the second water area, the opening is closed. When the closing mechanism stops the flow of water from the first water area to the second water area in the emergency, when the water level detected by the water level detection unit rises and reaches a predetermined water level, the opening is closed by setting the door body to the closed state. The water level detection unit detects the water level of the deviated water area in the second water area by detecting the water level of the water introduced into the water storage chamber from the water area deviated from the water area formed by extending the wall surface of the opening divided by the first side wall and the second side wall to the second water area. The gate as claimed in claim 1, wherein the first side wall, the second side wall and the opening are arranged on a dike separating the first water area and the second water area, the first side wall extends from the dike to the second water area, and the water level detection unit detects the water level of the second water area by detecting the water level introduced into the water storage chamber from a water area on the opposite side of the first side wall and the gate body in the second water area. A gate as described in claim 1 or claim 2, wherein the gate body is configured to rotate between a lying state in which the opening is opened and an upright state in which the opening is closed, and the gate body rotates from the lying state to the upright state by the buoyancy exerted on the gate body.

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