Flap gate

Abstract

A flap gate 100 comprises: a door body 10 that rotates around a predetermined rotation axis X between a fallen state fallen in water and a standing state standing from the water; a mooring device 1 that moors the door body 10 in the fallen state; an air chamber 70 that is disposed in the water and is airtightly partitioned; and a communication chamber 73 that is disposed adjacent to the air chamber 70 via a partition wall 71, and has a lower part opened in the water and an upper part in which an air reservoir 74 is formed. The mooring device 1 includes: a hook 2 which is switched between an engaged state of being engaged with the door body 10 in the fallen state and a release state of releasing the engagement with the door body 10; an actuator 3 for generating a driving force; and a transmission mechanism 4 for transmitting the driving force of the actuator 3 to the hook 2. The hook 2 is disposed in water. The actuator 3 is disposed in the air chamber 70. The transmission mechanism 4 is disposed from the air chamber 70, passing through the partition wall 71, to the hook 2 through the air reservoir 74.

Description

Undulating gate

[0001] The technology disclosed herein relates to a relief gate.

[0002] Conventionally, a retractable gate has been known that includes a gate body that rotates between a lying-down state in which it is lying down in water and an upright state in which it is raised out of water, and a mooring device that moor the gate body in the lying-down state. The mooring device includes a hook that engages with the gate body. The hook is driven by an actuator. The driving force of the actuator is transmitted from the actuator to the hook via a transmission mechanism. The actuator is disposed above water. The transmission mechanism is disposed between the actuator above water and the hook in water.

[0003] JP 2011-111722 A

[0004] In the above-mentioned undulating gate, if the distance from the actuator to the hook is long, the transmission mechanism is placed over a long distance, which reduces the efficiency of the driving force transmission. Therefore, it is difficult to place the hook far from the actuator. As a result, the size of the gate body, the placement of the gate body, and the number of gate bodies when multiple gate bodies are installed may be restricted.

[0005] The technology disclosed herein has been made in view of the above points, and its purpose is to reduce the influence that the distance between the hook and the actuator has on the configuration of the undulating gate.

[0006] The elevation gate disclosed herein comprises a door body that rotates around a predetermined rotation axis between a lying-down state in which it is lying down underwater and an upright state in which it is upright out of the water, a mooring device that moor the door body in the lying-down state, an airtightly partitioned air chamber that is placed underwater, and a communication chamber that is placed adjacent to the air chamber via a partition wall, with its lower part open to the water and its upper part having an air reservoir formed therein, the mooring device having a hook that switches between an engagement state in which it engages with the door body in the lying-down state and a release state in which it releases the engagement with the door body, an actuator that generates a driving force, and a transmission mechanism that transmits the driving force of the actuator to the hook, the hook being placed underwater and the actuator being placed in the air chamber, and the transmission mechanism being placed from the air chamber through the partition wall and the air reservoir to the hook.

[0007] According to the above-described undulating gate, the influence of the distance between the hook and the actuator on the structure of the undulating gate can be reduced.

[0008] Fig. 1 is an overview of a port where a hoisting gate is installed. Fig. 2 is a schematic cross-sectional view of the hoisting gate in a collapsed state. Fig. 3 is a side view showing the schematic configuration of a mooring device. Fig. 4 is a plan view showing the schematic configuration of a mooring device. Fig. 5 is a longitudinal cross-sectional view of a shaft in a through hole. Fig. 6 is a side view showing the schematic configuration of a mooring device with the door body disengaged. Fig. 7 is a side view showing the schematic configuration of a mooring device in the middle of mooring the door body. Fig. 8 is a side view showing the schematic configuration of a mooring device according to a modified example.

[0009] An exemplary embodiment will be described in detail below with reference to the drawings. Figure 1 is a schematic view of a port where a relief gate 100 is installed. Figure 2 is a schematic cross-sectional view of the relief gate 100 in a collapsed state.

[0010] The relief gate 100 is a facility for holding back water. For example, the relief gate 100 is installed in the ocean, more specifically, in a port, as a measure against tsunamis and high tides. For example, the relief gate 100 is placed in an opening 91 formed in a bank body 9. The relief gate 100, together with the bank body 9, constitutes a breakwater.

[0011] As shown in Figure 2, the elevation gate 100 comprises a door body 10 that rotates around a predetermined rotation axis X between a lying-down state in which it is lying down in the water and an upright state in which it is standing up out of the water, a mooring device 1 that moor the door body 10 in the lying-down state, and a storage chamber 7 that houses the mooring device 1.

[0012] The door body 10 is formed in a plate shape extending in a plane formed by a horizontal direction coincident with the direction of the rotation axis X and a vertical direction perpendicular to the horizontal direction. Specifically, the door body 10 is formed in a substantially rectangular plate shape. The rotation axis X is located at a portion of the door body 10 corresponding to one side of the rectangle. In this example, as shown in FIG. 1 , the elevation gate 100 includes four door bodies 10. The four door bodies 10 are arranged so that their respective rotation axes X are aligned in a straight line. The four door bodies 10 are disposed in the opening 91. In the lying-down state, the door body 10 is submerged in water. In the upright state, the door body 10 partially protrudes above the water and closes the opening 91. An air chamber (not shown) is formed inside the door body 10. The door body 10 rotates from a lying-down state to an upright state due to the buoyancy of the door body 10.

[0013] As shown in Figure 2, the elevation gate 100 includes a box body 8 having a storage space 81 formed therein for storing the door bodies 10 in a collapsed state. The box body 8 is placed underwater. The box body 8 is formed in a box shape that opens upward. The internal space of the box body 8 is the storage space 81. The planar shape of the storage space 81 is approximately rectangular, and is slightly larger than the door bodies 10. In this example, one common storage space 81 is provided for the four door bodies 10.

[0014] An engagement portion 13 is provided on the edge of the door body 10 opposite to the rotation axis X. A hook 2 of the mooring device 1, which will be described later, engages with the engagement portion 13, so that the door body 10 is moored in a laid-down state.

[0015] Fig. 3 is a side view showing a schematic configuration of the mooring device 1. Fig. 4 is a plan view showing a schematic configuration of the mooring device 1. Fig. 5 is a longitudinal cross-sectional view of the shaft 41 at the through hole 72. Note that the door body 10 is omitted from Fig. 4. The storage chamber 7 includes an air chamber 70 that stores a part of the mooring device 1 and a communication chamber 73 that stores another part of the mooring device 1. The air chamber 70 and the communication chamber 73 are formed in the case body 8. More specifically, the air chamber 70 and the communication chamber 73 are formed inside one side wall of the case body 8. The air chamber 70 and the communication chamber 73 are arranged in a position that is aligned vertically with the door body 10 in the laid-down state and facing the edge of the door body 10 opposite the rotation axis X.

[0016] The air chamber 70 is disposed underwater and is partitioned airtight. The air chamber 70 is disposed underwater adjacent to the door body 10 in the laid-down state. More specifically, the air chamber 70 is disposed alongside the door body 10 in the laid-down state in the vertical direction of the door body 10. The air chamber 70 is partitioned airtight.

[0017] The air pressure in the air chamber 70 is controlled to a predetermined target pressure. The target pressure is a pressure higher than atmospheric pressure, for example, a pressure equivalent to the water depth of the air chamber 70. The water depth of the air chamber 70 is set based on the standard water level of the water area where the mooring device 1 is located. Although not shown, the air chamber 70 is connected to an air supply source via an air pipe. A pressure reducing valve is provided in the air pipe. The pressure of air from the air supply source is adjusted by the pressure reducing valve and supplied to the air chamber 70.

[0018] A buffer chamber 77 is disposed adjacent to the air chamber 70. A first hatch 78 is provided between the air chamber 70 and the buffer chamber 77. When the first hatch 78 is open, the air chamber 70 and the buffer chamber 77 communicate with each other. When the first hatch 78 is closed, the air chamber 70 and the buffer chamber 77 are airtightly isolated from each other. A second hatch 79 is also provided in the buffer chamber 77. When the second hatch 79 is open, the buffer chamber 77 communicates with the space outside the buffer chamber 77. When the second hatch 79 is closed, the buffer chamber 77 and the space outside the buffer chamber 77 are airtightly isolated from each other.

[0019] The communication chamber 73 is arranged adjacent to the air chamber 70 via a partition wall 71. The communication chamber 73 is arranged adjacent to the air chamber 70 underwater. One wall that divides the air chamber 70 is the partition wall 71 that separates the air chamber 70 from the communication chamber 73. In relation to the door body 10, the communication chamber 73 is arranged adjacent to the door body 10 in the laid-down state. More specifically, the communication chamber 73 is arranged alongside the door body 10 in the laid-down state in the vertical direction of the door body 10. The lower part of the communication chamber 73 is open to the water, and an air reservoir 74 is formed above the communication chamber 73. In other words, the lower part of the communication chamber 73 is water-sealed, and the air reservoir 74 is formed above the communication chamber 73.

[0020] The air pressure in the air reservoir 74 is controlled to a predetermined target pressure. The target pressure is a pressure higher than atmospheric pressure, for example, a pressure equivalent to that of the air chamber 70. More specifically, a first air pipe 75 is connected to the air reservoir 74. The first air pipe 75 is connected to the air chamber 70 via a check valve 75b. An electric valve 75a is provided in the first air pipe 75. When the electric valve 75a opens, air is supplied from the air chamber 70 to the air reservoir 74 in accordance with the pressure difference between the air chamber 70 and the air reservoir 74. Specifically, when the pressure in the air reservoir 74 is lower than the pressure in the air chamber 70, air is supplied from the air chamber 70 to the air reservoir 74, and the pressure in the air reservoir 74 becomes equal to that of the air chamber 70. For example, the target pressure of the air chamber 70 is set corresponding to the standard water level of the water area in which the mooring device 1 is located. A standard water level for the communication chamber 73 is set corresponding to the standard water level of the water area where the mooring device 1 is located. The standard water level for the communication chamber 73 is higher than the lower opening end of the communication chamber 73 (i.e., the lower end of the side wall that defines the communication chamber 73 so that it opens downward) by a predetermined water level difference (this water level difference is referred to as the "standard water level difference"). When the water level of the water area where the mooring device 1 is located is equal to or higher than the standard water level of the water area minus the standard water level difference for the communication chamber 73, the electric valve 75a is opened. On the other hand, when the water level of the water area where the mooring device 1 is located is lower than the standard water level of the water area minus the standard water level difference for the communication chamber 73, the solenoid valve 75a is closed. When the water level of the water area where the mooring device 1 is located is at the standard water level, the pressure in the air reservoir 74 is normally equal to the pressure corresponding to the water depth from the standard water level. However, if air leaks from air reservoir 74 to air chamber 70 due to water level fluctuations or the like and the amount of air in air reservoir 74 decreases, the water level in communication chamber 73 may rise and the pressure in air reservoir 74 may not reach the pressure corresponding to the water depth from the standard water level. In such a case, air can be supplied from air chamber 70 to air reservoir 74 via check valve 75b by opening motor-operated valve 75a.

[0021] A second air pipe 76 may be connected to the air chamber 70. The second air pipe 76 is in communication with the air chamber 70. A manual valve 76a is provided in the second air pipe 76. The manual valve 76a is manually operated by the user. When the manual valve 76a is opened, the air chamber 70 and the air reservoir 74 are in communication. When the pressure in the air reservoir 74 is lower than the pressure in the air chamber 70, air is supplied from the air chamber 70 to the air reservoir 74, and the pressure in the air reservoir 74 becomes equal to the pressure in the air chamber 70. When the manual valve 76a is closed, the second air pipe 76 is shut off.

[0022] The elevation gate 100 is equipped with mooring devices 1 in the same number as the door bodies 10. In this example, the elevation gate 100 is equipped with four mooring devices 1. In other words, one mooring device 1 is provided for each door body 10. The mooring device 1 has a hook 2, an actuator 3 that generates a driving force, and a transmission mechanism 4 that transmits the driving force of the actuator 3 to the hook 2. In this example, the mooring device 1 has two hooks 2. The mooring devices 1 are arranged in a vertical line with respect to the door body 10 in the collapsed state.

[0023] The hook 2 switches between an engagement state in which it engages with the door body 10 in the laid-down state and a release state in which it releases the engagement with the door body 10. The hook 2 is arranged near the door body 10. More specifically, it is arranged underwater near the engagement portion 13 of the door body 10 in the laid-down state. The hook 2 is arranged outside the air chamber 70 and the communication chamber 73.

[0024] The hook 2 is non-rotatably attached to the shaft 21. The shaft 21 is supported rotatably around the rotation axis A. The rotation axis A is approximately parallel to the rotation axis X. The hook 2 extends from the shaft 21 in the radial direction of the rotation axis A. The shaft 21 is placed in water. The hook 2 is positioned on the engagement portion 13 of the door body 10 in the laid-down state at a predetermined rotation position around the rotation axis A. In this state, the hook 2 engages with the engagement portion 13. This position is referred to as the "engagement position." The state in which the hook 2 engages with the engagement portion 13 is referred to as the "engagement state."

[0025] A counterweight 23 is provided on the shaft 21 to rotate the hook 2 in the circumferential direction around the rotation axis A. Specifically, the shaft 21 has a first arm 21a and a second arm 21b extending in the radial direction of the rotation axis A. The second arm 21b is disposed at a position approximately 180 degrees apart from the hook 2 about the rotation axis A. The counterweight 23 is suspended from the second arm 21b. The counterweight 23 generates a rotational moment in a direction that moves the hook 2 upward from the engaged position. A transmission mechanism 4 is connected to the first arm 21a, as will be described in detail later.

[0026] The actuator 3 includes a hydraulic cylinder 31 and a sensor 35 that detects the stroke amount of the hydraulic cylinder 31. The hydraulic cylinder 31 includes a cylinder tube 32 and a piston rod 33 that moves forward and backward relative to the cylinder tube 32. A hydraulic circuit is connected to the hydraulic cylinder 31, and oil is supplied to and discharged from the hydraulic circuit via the hydraulic circuit. The sensor 35 is a so-called stroke sensor that detects the displacement of the piston rod 33 relative to the cylinder tube 32. For example, the sensor 35 is a magnetostrictive stroke sensor.

[0027] The actuator 3 (i.e., the hydraulic cylinder 31 and the sensor 35) is disposed in the air chamber 70. The cylinder tube 32 is supported so as to be rotatable about a rotation axis B. In this example, the hydraulic cylinder 31 is disposed so that the piston rod 33 protrudes downward from the cylinder tube 32.

[0028] The transmission mechanism 4 is disposed from the air chamber 70 through the partition wall 71 and the air reservoir 74 to the hook 2. The transmission mechanism 4 includes a shaft 41 that is driven to rotate about an axis C by the actuator 3. The shaft 41 penetrates the partition wall 71 in the direction of the axis C and extends inside both the air chamber 70 and the air reservoir 74. As shown in FIG. 5 , a through-hole 72 through which the shaft 41 passes is formed in the thickness direction of the partition wall 71. The axis C extends in the direction of the rotation axis X of the door body 10. That is, the axis C is approximately parallel to the rotation axis X.

[0029] The shaft 41 is supported by bearings 42 so as to be rotatable around the axis C. In this example, the shaft 41 is supported by two bearings 42. One of the bearings 42 is disposed in the partition wall 71. The other bearing 42 is disposed in a side wall 710 that faces the partition wall 71 and that defines the communication chamber 73.

[0030] The shaft 41 is rotatably sealed in a through hole 72 of the partition wall 71. More specifically, as shown in Fig. 5, the partition wall 71 is provided with a rotary seal 43 that comes into contact with the outer circumferential surface of the shaft 41. The rotary seal 43 is disposed closer to the communication chamber 73 than the bearing 42 provided in the partition wall 71. The shaft 41 is slidable relative to the rotary seal 43.

[0031] In this example, two more rotary seals 43 are provided. Specifically, the rotary seal 43 is provided on the partition wall 71 closer to the air chamber 70 than the bearing 42. The rotary seal 43 is provided on the side wall 710 closer to the communication chamber 73 than the bearing 42.

[0032] The transmission mechanism 4 further includes a first transmission mechanism 5 that connects the actuator 3 and the shaft 41 , and a second transmission mechanism 6 that connects the shaft 41 and the hook 2 .

[0033] The first transmission mechanism 5 is disposed in the air chamber 70. The first transmission mechanism 5 includes a lever 51 connected to the actuator 3 and a first link rod 52 connected to the lever 51. The lever 51 has a first end 51a which is one end in the longitudinal direction and a second end 51b which is the other end in the longitudinal direction. The first link rod 52 has a first end 52a which is one end in the longitudinal direction and a second end 52b which is the other end in the longitudinal direction.

[0034] The lever 51 is supported at a first end 51a in the air chamber 70 so as to be rotatable around a rotation axis E. A first link rod 52 is connected to a second end 51b of the lever 51 via a spring cylinder 53. Specifically, the second end 51b is connected to a cylinder tube 53a of the spring cylinder 53 so as to be rotatable around a rotation axis F. A first end 52a of the first link rod 52 is connected to a piston rod 53b of the spring cylinder 53.

[0035] The lever 51 is disposed below the rotation axis B. The actuator 3 is connected to a portion of the lever 51 between the first end 51 a and the second end 51 b (hereinafter referred to as the “middle portion”). Specifically, the tip of the piston rod 33 of the hydraulic cylinder 31 is connected to the middle portion of the lever 51 so as to be rotatable around the rotation axis D.

[0036] The second end 52b of the first link rod 52 is connected to the shaft 41. More specifically, the shaft 41 has a first arm 41a extending in the radial direction of the axis C. The first arm 41a is disposed within the air chamber 70. The second end 52b is connected to the first arm 41a so as to be rotatable around the rotation axis G.

[0037] The second transmission mechanism 6 is disposed in the communication chamber 73 and underwater. The second transmission mechanism 6 has a plurality of links connecting the shaft 41 and the hook 2. Specifically, the second transmission mechanism 6 includes a second link rod 61 connected to the shaft 41, a third link rod 63 connected to the shaft 21 of the hook 2, and a rotation link 62 connected to both the second link rod 61 and the third link rod 63. The second link rod 61 has a first end 61a that is one end in the longitudinal direction and a second end 61b that is the other end in the longitudinal direction. The third link rod 63 has a first end 63a that is one end in the longitudinal direction and a second end 63b that is the other end in the longitudinal direction. The second link rod 61, the rotation link 62, and the third link rod 63 are connected to each other so as to be rotatable around an axis extending in the direction of the rotation axis X.

[0038] Specifically, a first end 61a of the second link rod 61 is connected to the shaft 41. Specifically, the shaft 41 has a second arm 41b extending in the radial direction of the axis C. The second arm 41b is disposed in an air reservoir 74 of the communication chamber 73. The first end 61a is connected to the second arm 41b so as to be rotatable around a rotation axis H.

[0039] The second end 61b of the second link rod 61 is connected to the rotation link 62. More specifically, the rotation link 62 is non-rotatably attached to the shaft 64. The shaft 64 is supported rotatably around the rotation axis I. The rotation link 62 and the shaft 64 are disposed underwater. The rotation link 62 has a first arm 62a and a second arm 62b extending in the radial direction of the rotation axis I. The second end 61b is connected to the first arm 62a rotatably around the rotation axis J. A portion of the second link rod 61 is disposed in the air reservoir 74, and the remaining portion of the second link rod 61 is disposed underwater.

[0040] The third link rod 63 is disposed in water. A first end 63 a of the third link rod 63 is connected to the rotation link 62. More specifically, the first end 63 a is connected to the second arm 62 b so as to be rotatable around the rotation axis K.

[0041] A second end 63b of the third link rod 63 is connected to the shaft 21. More specifically, the second end 63b is connected to the first arm 21a so as to be rotatable around the rotation axis L.

[0042] Rotation axis A, rotation axis B, axis center C, rotation axis D, rotation axis E, rotation axis F, rotation axis G, rotation axis H, rotation axis I, rotation axis J, rotation axis K, and rotation axis L extend in the direction of rotation axis X, that is, are approximately parallel to rotation axis X.

[0043] Next, the operation of the mooring device 1 will be described. Figure 6 is a side view showing a schematic configuration of the mooring device 1 with the door body 10 disengaged. Figure 7 is a side view showing a schematic configuration of the mooring device 1 during the process of mooring the door body 10. The control device controls the actuator 3. When the actuator 3 operates, the driving force of the actuator 3 is transmitted to the hook 2 via the transmission mechanism 4, causing the hook 2 to rotate. The control device controls the rotational position of the hook 2 by adjusting the displacement of the piston rod 33 based on the detection result of the sensor 35.

[0044] First, the operation of the mooring device 1 when the hook 2 is released from the door body 10 will be described. In the mooring state, as shown in FIG. 3 , the hook 2 is located at the engagement position and is engaged with the engagement portion 13 of the door body 10 in the collapsed state. From this state, the actuator 3 retracts the piston rod 33. The retraction of the piston rod 33, i.e., its upward movement, causes the lever 51 to rotate upward about the rotation axis E. The upward movement of the second end 51 b of the lever 51 causes the first link rod 52 to move upward. The upward movement of the first link rod 52 causes the shaft 41 to rotate around the axis C. The shaft 41 rotates counterclockwise in FIG. 6 . For ease of explanation, this direction of rotation of the shaft 41, i.e., counterclockwise rotation in FIG. 6 , is referred to as "reverse rotation." When the shaft 41 rotates reversely, the second link rod 61 moves downward. The downward movement of the second link rod 61 causes the rotation link 62 to rotate around the rotation axis I. The rotation link 62 rotates counterclockwise in FIG. 6 . For ease of explanation, rotation of the rotation link 62 in this direction, i.e., counterclockwise rotation in FIG. 6 , is referred to as "reverse rotation." When the rotation link 62 rotates reversely, the third link rod 63 moves upward. The upward movement of the third link rod 63 causes the shaft 21 and hook 2 to rotate around the rotation axis A. The shaft 21 and hook 2 rotate counterclockwise in FIG. 6 . For ease of explanation, rotation of the shaft 21 and hook 2 in this direction, i.e., counterclockwise rotation in FIG. 6 , is referred to as "reverse rotation." The actuator 3 moves the hook 2 upward from the engagement position to a position where it does not interfere with the trajectory of the engagement portion 13 when the door body 10 rotates. More specifically, the control device controls the actuator 3 based on the detection result of the sensor 35 to move the hook 2 out of the path of the engaging portion 13. This causes the hook 2 to disengage from the engaging portion 13. At this time, the counterweight 23 encourages the reverse rotation of the hook 2. When the hook 2 disengages from the engaging portion 13, the door body 10 rotates to an upright position due to buoyancy.

[0045] Next, the operation of the mooring device 1 when the hook 2 is engaged with the door body 10 will be described. When the door body 10 is not moored, the door body 10 is in an upright position. At this time, the hook 2 may be in any position. In this description, the hook 2 is assumed to be located above the engagement position and outside the trajectory of the engagement portion 13 (see the two-dot chain line in Figure 7).

[0046] From this state, the actuator 3 advances the piston rod 33. The advancement of the piston rod 33, i.e., downward movement, causes the lever 51 to rotate downward about the rotation axis E. The downward movement of the second end 51b of the lever 51 causes the first link rod 52 to move downward. The downward movement of the first link rod 52 causes the shaft 41 to rotate around the axis C. The shaft 41 rotates clockwise in FIG. 7. For ease of explanation, this direction of rotation of the shaft 41, i.e., clockwise rotation in FIG. 7, is referred to as "forward rotation." When the shaft 41 rotates forward, the second link rod 61 moves upward. The upward movement of the second link rod 61 causes the rotation link 62 to rotate around the rotation axis I. The rotation link 62 rotates clockwise in FIG. 7. For ease of explanation, this direction of rotation of the rotation link 62, i.e., clockwise rotation in FIG. 7, is referred to as "forward rotation." When the rotation link 62 rotates forward, the third link rod 63 moves downward. The downward movement of the third link rod 63 causes the shaft 21 and hook 2 to rotate around the rotation axis A. The shaft 21 and hook 2 rotate clockwise in FIG. 7 . For ease of explanation, this rotation of the shaft 21 and hook 2, i.e., clockwise rotation in FIG. 7 , is referred to as "forward rotation." At this time, the actuator 3 moves the hook 2 to a position below the engagement position and outside the trajectory of the engagement portion 13. More specifically, the control device controls the actuator 3 based on the detection result of the sensor 35 to move the hook 2 to a position outside the trajectory of the engagement portion 13. The door body 10 is then lowered. Because the hook 2 is positioned outside the trajectory of the engagement portion 13, the engagement portion 13 does not interfere with the hook 2. The door body 10 is lowered until the engagement portion 13 reaches a position below the hook 2. More specifically, the door body 10 is lowered until the engagement portion 13 moves outside the rotation trajectory of the hook 2.

[0047] When the engaging portion 13 moves below the hook 2, the actuator 3 retracts the piston rod 33. The hook 2 rotates in the reverse direction by the same operation as when disengaging the hook 2 described above. The actuator 3 moves the hook 2 to the engaging position and maintains it in the engaged position. With the hook 2 in the engaged position, the door body 10 is rotated upward. When the door body 10 rotates upward, the engaging portion 13 engages with the hook 2 from below. This completes the engagement between the engaging portion 13 and the hook 2.

[0048] In the mooring device 1, the lever 51 is suspended from the piston rod 33 of the actuator 3. Therefore, the weight of the lever 51 acts on the advancing side of the piston rod 33. In other words, the weight of the lever 51 generates a forward rotation moment on the hook 2, making it easier to return the hook 2 from the released state to the engaged state.

[0049] In the thus configured wave-rising gate 100, the actuator 3 is disposed in the air chamber 70 that is disposed underwater. The air chamber 70 is configured to be airtight, thereby preventing the actuator 3 from being submerged in water. Furthermore, the sensor 35 is also disposed in the air chamber 70, thereby preventing the sensor 35 from being submerged in water. This ensures proper operation of the actuator 3 and the sensor 35.

[0050] Since the actuator 3 is disposed in the underwater air chamber 70, the actuator 3 can be disposed near the door body 10 that is in a lying down state underwater. As a result, the distance from the actuator 3 to the hook 2 can be shortened. This reduces the influence, i.e., the constraints, that are imposed by the distance between the hook 2 and the actuator 3 on the size and arrangement of the door body 10 and the number of door bodies 10 when they are installed side by side.

[0051] For example, when multiple gate bodies 10 are arranged as shown in FIG. 1 , the gate bodies 10 at both ends in the arrangement direction are located near onshore structures such as embankments 9, while the gate body 10 on the inner side in the arrangement direction is located farther from the onshore structure. When the actuator 3 is located on the onshore structure, the distance from the actuator 3 to the hook 2 corresponding to the gate body 10 on the inner side in the arrangement direction is long. If the distance between the hook 2 and the actuator 3 is long, it may be difficult to arrange a transmission mechanism for transmitting the driving force, and the loss during transmission of the driving force will also be large. This problem is not limited to when multiple gate bodies 10 are arranged. If the lateral dimension of the gate body 10 is large, depending on the position of the hook 2, the distance from the onshore structure to the hook 2 will be long, resulting in a long distance between the hook 2 and the actuator 3.

[0052] However, in the undulating gate 100, the actuator 3 is disposed in an air chamber 70 underwater. When multiple door bodies 10 are arranged, an air chamber 70 is formed near each door body 10 in a laid-down state underwater, and the actuator 3 corresponding to each door body 10 can be disposed in the air chamber 70. This allows the actuator 3 corresponding to each door body 10 to be disposed near each door body 10, thereby shortening the distance between the hook 2 and the actuator 3. Furthermore, even in the case of a door body 10 with a large lateral dimension, an air chamber 70 is formed near the hook 2 underwater, and the actuator 3 can be disposed in the air chamber 70. This allows the actuator 3 to be disposed near the door body 10, thereby shortening the distance between the hook 2 and the actuator 3.

[0053] For example, the mooring device 1 is arranged in a position aligned vertically with the door body 10 in its laid-down state. The door body 10 is usually arranged so as to block water flowing in a direction intersecting the rotation axis X. In other words, in the water area where the door body 10 is installed, water tends to flow along the vertical direction of the door body 10. Even if the mooring device 1 and the door body 10 are arranged vertically, the mooring device 1 is arranged below the water surface. Because above-water structures such as machinery rooms are not arranged vertically with the door body 10, the mooring device 1 can be arranged near the laid-down door body 10 without obstructing the flow of water or the passage of ships and the like.

[0054] When the distance between the hook 2 and the actuator 3 is short, the length of each link included in the transmission mechanism 4 can be shortened, thereby improving the strength of each link against buckling.

[0055] Furthermore, the transmission mechanism 4 does not include a flexible connecting element and transmits both pulling and pushing forces. Therefore, the actuator 3 can rotate the hook 2 in both directions in the circumferential direction around the rotation axis A. As a result, the actuator 3 can control both the operation of engaging the hook 2 with the door body 10 and the operation of releasing the engagement of the hook 2 with the door body 10.

[0056] A communication chamber 73 is formed adjacent to the air chamber 70 via a partition wall 71, and the shaft 41 of the transmission mechanism 4 passes through the partition wall 71 and extends into both the air chamber 70 and the communication chamber 73. The driving force of the actuator 3 is transmitted from the air chamber 70 side to the communication chamber 73 side via the shaft 41. The shaft 41 is sealed by a rotary seal 43 at a through-hole 72 in the partition wall 71. The rotary seal 43 prevents water from entering the air chamber 70 from the through-hole 72. This ensures the airtightness of the air chamber 70.

[0057] In addition, an air reservoir 74 is formed above the communication chamber 73, and the shaft 41 is disposed in the air reservoir 74 in the communication chamber 73. This prevents the shaft 41 from becoming submerged. Furthermore, the through-hole 72 in the partition wall 71 is located at a position higher than the air reservoir 74, i.e., the water surface in the communication chamber 73. As a result, the possibility of water entering the air chamber 70 through the through-hole 72 is further reduced.

[0058] The through-hole 72 of the partition wall 71 is sealed by the rotary seal 43, reducing the flow of air between the air chamber 70 and the air reservoir 74. Even if the water pressure in the communication chamber 73 fluctuates due to fluctuations in the water level of the body of water in which the air chamber 70 is located, the air reservoir 74 can be maintained. This prevents the shaft 41 and the through-hole 72 in the communication chamber 73 from becoming submerged in water.

[0059] Furthermore, the air pressure in the air chamber 70 is controlled to a pressure equivalent to the water depth relative to the standard water level of the body of water in which the air chamber 70 is located, which also reduces the flow of air between the air chamber 70 and the air reservoir 74.

[0060] In addition, the air pressure in the air reservoir 74 is adjusted to a pressure higher than atmospheric pressure, for example, the same pressure as that of the air chamber 70. This suppresses fluctuations in the water surface in the communication chamber 73.

[0061] <Modifications> Next, a mooring device 201 according to a modification will be described. Figure 8 is a side view showing the schematic configuration of the mooring device 201 according to the modification. The mooring device 201 differs from the mooring device 1 in that the weight of the lever 51 acts on the retracting side of the piston rod 33. The following description will focus on the configuration of the mooring device 201 that differs from the mooring device 1. The same components of the mooring device 201 as those of the mooring device 1 will be assigned the same reference numerals and will not be described again.

[0062] Specifically, the configurations of the actuator 3 and the first transmission mechanism 205 of the mooring device 201 are different from those of the mooring device 1. The configuration of the second transmission mechanism 6 of the mooring device 201 is the same as that of the mooring device 1.

[0063] The actuator 3 is disposed in the air chamber 70. The cylinder tube 32 is supported so as to be rotatable about a rotation axis B. In the mooring device 201, the hydraulic cylinder 31 is disposed so that the piston rod 33 protrudes obliquely upward from the cylinder tube 32.

[0064] The first transmission mechanism 205 is disposed in the air chamber 70. The first transmission mechanism 205 includes a lever 51 connected to the actuator 3 and a first link rod 52 connected to the lever 51. The lever 51 is supported in the air chamber 70 at a first end 51a so as to be rotatable around a rotation axis E. The lever 51 is disposed at an incline so that a second end 51b is positioned diagonally above the first end 51a. The first link rod 52 is connected to the second end 51b via a spring cylinder 53.

[0065] The actuator 3 is connected to the middle portion of the lever 51. Specifically, the tip of the piston rod 33 of the hydraulic cylinder 31 is connected to the middle portion of the lever 51 so as to be rotatable around a rotation axis D. The actuator 3 is connected to the lever 51 so as to support the inclined lever 51 from diagonally below.

[0066] First, the operation of the mooring device 201 when the hook 2 is released from the door body 10 will be described. From the engaged state of the hook 2, the actuator 3 retracts the piston rod 33. The retraction of the piston rod 33, i.e., its diagonally downward movement, causes the lever 51 to rotate diagonally downward about the rotation axis E. The diagonally downward movement of the second end 51b of the lever 51 causes the first link rod 52 to move diagonally downward. The diagonally downward movement of the first link rod 52 causes the shaft 41 to rotate in the reverse direction about the axis C, i.e., counterclockwise in FIG. 8 . The operation of the second transmission mechanism 6 when the shaft 41 rotates in the reverse direction is the same as that of the mooring device 1. As a result, the shaft 21 and the hook 2 rotate in the reverse direction about the rotation axis A, i.e., counterclockwise in FIG. 8 , and the hook 2 is released from engagement with the engagement portion 13.

[0067] Next, the operation of the mooring device 201 when the hook 2 is engaged with the door body 10 will be described. For example, when the hook 2 is located above the engagement position and outside the path of the engagement portion 13, the actuator 3 advances the piston rod 33. The advancement of the piston rod 33, i.e., its diagonally upward movement, causes the lever 51 to rotate diagonally upward about the rotation axis E. The diagonally upward movement of the second end 51 b of the lever 51 causes the first link rod 52 to move diagonally upward. The diagonally upward movement of the first link rod 52 causes the shaft 41 to rotate forward about the axis C, i.e., clockwise in FIG. 8 . The operation of the second transmission mechanism 6 when the shaft 41 rotates forward is the same as that of the mooring device 1. As a result, the shaft 21 and the hook 2 rotate forward about the rotation axis A, i.e., clockwise in FIG. 8 , and the hook 2 moves to a position below the engagement position and outside the path of the engagement portion 13. Next, the door body 10 is lowered until the engaging portion 13 reaches a position below the hook 2. Thereafter, the actuator 3 retracts the piston rod 33. The hook 2 rotates in the reverse direction by the same operation as when disengaging the hook 2 described above. The actuator 3 moves the hook 2 to the engaging position and maintains it in the engaged position. With the hook 2 in the engaged position, the door body 10 is rotated upward. When the door body 10 rotates upward, the engaging portion 13 engages with the hook 2 from below. This completes the engagement between the engaging portion 13 and the hook 2.

[0068] In the mooring device 201, the piston rod 33 supports the lever 51 from diagonally below. Therefore, the weight of the lever 51 acts on the retracting side of the piston rod 33. In other words, the weight of the lever 51 generates a reverse rotation moment on the hook 2, making it easier to maintain the hook 2 in a position outside the trajectory of the engaging portion 13 in the released state.

[0069] Other Embodiments As described above, the above-described embodiments have been described as examples of the technology disclosed in the present application. However, the technology of the present disclosure is not limited to these embodiments and can be applied to embodiments in which modifications, substitutions, additions, omissions, etc. are made as appropriate. Furthermore, the components described in the above-described embodiments can be combined to create new embodiments. Furthermore, the components described in the accompanying drawings and detailed description may include 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. Therefore, the fact that these non-essential components are described in the accompanying drawings or detailed description should not be interpreted as immediately determining that these non-essential components are essential.

[0070] For example, the undulating gate 100 is not limited to being installed in a port. The gate may be installed in a river or estuary, etc. Furthermore, the undulating gate 100 does not have to form a gate-type breakwater together with the embankment 9. That is, the undulating gate 100 may be installed not in an opening in an embankment, but in an opening defined by opposing side walls, such as a first side wall and a second side wall, at the mouth of a river or estuary.

[0071] The elevation gate 100 has four door bodies 10, but the number of door bodies 10 is not limited to this. The number of door bodies 10 may be one, two, three, five or more.

[0072] When multiple door bodies 10 are provided, a mooring device 1 or 201 is provided for each door body 10. In this case, an air chamber 70 corresponding to each of the multiple mooring devices 1 or 201 may be provided individually, or a common air chamber 70 may be provided corresponding to the multiple mooring devices 1 or 201. However, when a common air chamber 70 is provided, an air reservoir 74, i.e., a communication chamber 73, is provided individually corresponding to each of the multiple mooring devices 1 or 201.

[0073] Any configuration may be adopted for the actuator 3 as long as it generates a driving force for the hook 2. For example, the actuator 3 may be an electric motor or an air cylinder.

[0074] The transmission mechanism 4 is not limited to the above-described configuration. Any configuration may be adopted for the transmission mechanism 4 as long as it is arranged from the air chamber 70 through the partition wall 71 and the air reservoir 74 to the hook 2. For example, the transmission mechanism 4 may include transmission elements other than links. For example, the transmission mechanism 4 may include various transmission elements such as a belt, a chain, a lead screw, and a rack and pinion. The configuration, arrangement, number, etc. of the multiple links included in the transmission mechanism 4 may be set as desired.

[0075] This embodiment is a specific example of the following aspects.

[0076] [Mode 1] A rise-and-fall gate 100 includes a door body 10 that rotates around a predetermined rotation axis X between a lying-down state in which it is lying down in water and an upright state in which it is upright out of water, a mooring device 1, 201 that moor the door body 10 in the lying-down state, an air chamber 70 that is disposed underwater and airtightly partitioned, and a communication chamber 73 that is disposed adjacent to the air chamber 70 via a partition 71, with its lower part open to water and its upper part having an air reservoir 74 formed therein. The mooring device 1, 201 has a hook 2 that switches between an engagement state in which it engages with the door body 10 in the lying-down state and a release state in which it releases the engagement with the door body 10, an actuator 3 that generates a driving force, and a transmission mechanism 4 that transmits the driving force of the actuator 3 to the hook 2, the hook 2 being disposed underwater, the actuator 3 being disposed in the air chamber 70, and the transmission mechanism 4 being disposed from the air chamber 70 through the partition 71 and the air reservoir 74 to the hook 2.

[0077] According to this configuration, the actuator 3 is placed in the air chamber 70, which prevents the actuator 3 from being submerged in water. Therefore, the actuator 3 can be placed near the door body 10 in a laid-down state underwater, and further, the distance between the hook 2 and the actuator 3 can be shortened. Because the distance over which the transmission mechanism 4 transmits the driving force is shortened, the transmission mechanism 4 can be made smaller, and loss during transmission of the driving force is reduced.

[0078] [Mode 2] In the undulating gate 100 described in [Mode 1], the transmission mechanism 4 has a shaft 41 that is driven to rotate around the axis C by the actuator 3, and the shaft 41 penetrates the partition 71 in the direction of the axis C and extends inside both the air chamber 70 and the air reservoir 74.

[0079] With this configuration, the driving force is transmitted between the air chamber 70 and the communication chamber 73 via the shaft 41. The shaft 41 extends from the air chamber 70 through the partition wall 71 and into the air reservoir 74 of the communication chamber 73. In other words, the shaft 41 is not submerged. This prevents water from entering the through-hole 72 of the partition wall 71. As a result, water is prevented from entering the air chamber 70, and the actuator 3 is prevented from becoming submerged.

[0080] [Aspect 3] In the undulating gate 100 according to [Aspect 1] or [Aspect 2], the shaft 41 is rotatably sealed in the through-hole 72 of the partition wall 71 .

[0081] With this configuration, even if water in the communication chamber 73 reaches the through-hole 72 via the shaft 41, the water is prevented from entering the air chamber 70 via the through-hole 72. This further prevents water from entering the air chamber 70. Furthermore, by sealing the gap between the shaft 41 and the through-hole 72, the airtightness of the air chamber 70 is further ensured.

[0082] [Aspect 4] In the elevation gate 100 described in any one of [Aspect 1] to [Aspect 3], the axis C of the shaft 41 extends in the direction of the rotation axis X of the door body 10, and the transmission mechanism 4 includes a plurality of links, such as a second link rod 61, a rotation link 62, and a third link rod 63, that connect the shaft 41 and the hook 2, and the plurality of links are connected to each other so as to be rotatable around axes extending in the direction of the rotation axis X.

[0083] According to this configuration, the multiple links of the transmission mechanism 4 are arranged parallel to a plane perpendicular to the rotation axis X. This simplifies the arrangement of the multiple links, shortening the distance over which the driving force is transmitted by the multiple links and improving the efficiency of transmission of the driving force.

[0084] [Aspect 5] In the elevation gate 100 according to any one of [Aspect 1] to [Aspect 4], the transmission mechanism 4 transmits both a pulling force and a pushing force.

[0085] With this configuration, the transmission mechanism 4 can appropriately transmit the driving force of the actuator 3 so that the hook 2 can be changed to either the engaged state or the released state. As a result, the hook 2 can be intentionally controlled to be in the engaged state or the released state, rather than being controlled by chance.

[0086] [Aspect 6] In the elevation gate 100 according to any one of [Aspect 1] to [Aspect 5], the actuator 3 includes a hydraulic cylinder 31 and a sensor 35 that detects the stroke amount of the hydraulic cylinder 31.

[0087] According to this configuration, the hydraulic cylinder 31 and the sensor 35 are protected from submersion in water because they are disposed in the air chamber 70. As a result, proper operation of the hydraulic cylinder 31 and the sensor 35 is ensured.

[0088] [Aspect 7] In the elevation gate described in any one of [Aspect 1] to [Aspect 6], the door body 10 is formed in a plate shape extending within a plane formed by a horizontal direction that coincides with the direction of the rotation axis X and a vertical direction that is perpendicular to the horizontal direction, and the mooring device 1, 201 is arranged in a position that is aligned in the vertical direction with the door body 10 in the collapsed state.

[0089] The door body 10 is usually arranged so as to block water flowing in a direction intersecting the rotation axis X. That is, in the water area where the door body 10 is installed, water tends to flow along the vertical direction of the door body 10. Even if the mooring device 1, 201 and the door body 10 are arranged vertically, the mooring device 1, 201 is arranged below the water surface. Because above-water structures such as machinery rooms are not arranged vertically next to the door body 10, the mooring device 1, 201 can be arranged near the door body 10 in its collapsed state without obstructing the flow of water or the passage of ships and the like.

[0090] REFERENCE SIGNS LIST 100: Hoisting gate 1, 201: Mooring device 2: Hook 3: Actuator 31: Hydraulic cylinder 35: Sensor 4: Transmission mechanism 41: Shaft 61: Second link rod (link) 62: Rotating link (link) 63: Third link rod (link) 10: Gate body C: Axis center X: Rotating axis

Claims

1. A rise-and-fall gate comprising: a door body that rotates around a predetermined rotation axis between a lying down state in water and an upright state in water; a mooring device that moor the door body in the lying down state; an air chamber that is disposed underwater and airtightly partitioned; and a communication chamber that is disposed adjacent to the air chamber via a partition wall, with a lower part open to the water and an upper part having an air pool, the mooring device having a hook that switches between an engagement state that engages with the door body in the lying down state and a release state that releases the engagement with the door body, an actuator that generates a driving force, and a transmission mechanism that transmits the driving force of the actuator to the hook, the hook being disposed underwater, the actuator being disposed in the air chamber, and the transmission mechanism being disposed from the air chamber through the partition wall and through the air pool to the hook.

2. A waving gate as described in claim 1, wherein the transmission mechanism has a shaft that is driven to rotate about its axis by the actuator, and the shaft passes through the partition in the direction of the axis and extends inside both the air chamber and the air reservoir.

3. A relief gate according to claim 2, wherein said shaft is rotatably sealed in a through hole in said bulkhead.

4. A rise-and-fall gate as described in claim 2 or 3, wherein the axis of the shaft extends in the direction of the rotation axis of the gate body, the transmission mechanism includes a plurality of links connecting the shaft and the hook, and the plurality of links are connected to each other so as to be rotatable around an axis extending in the direction of the rotation axis.

5. A lift gate according to any one of claims 1 to 3, wherein the transmission mechanism transmits both a pulling force and a pushing force.

6. A lift gate according to any one of claims 1 to 3, wherein the actuator includes a hydraulic cylinder and a sensor for detecting the stroke amount of the hydraulic cylinder.

7. A rise-and-fall gate as claimed in any one of claims 1 to 3, wherein the door body is formed in the shape of a plate extending within a plane formed by a horizontal direction coinciding with the direction of the rotation axis and a vertical direction perpendicular to the horizontal direction, and the mooring device is arranged in a position aligned in the vertical direction with respect to the door body in the collapsed state.

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