JP6846315B2 - Underwater installation type undulating gate - Google Patents

Description

The present invention relates to a bottom-mounted undulating gate.

Conventionally, in order to prevent a tsunami or a storm surge from flowing into a harbor or the like, an undulating gate is provided on the bottom of the entrance or exit of the harbor or the like. In the water bottom installation type undulating gate, by supplying air to the inside of the door body lying down on the water bottom, the door body rotates around the rotation axis provided on the water bottom and stands up.

For example, in Patent Document 1, a door body in which a plurality of sets of door body blocks are arranged side by side in the width direction stands up by the buoyancy of an air chamber provided at the tip of the door body, and a undulating gate type breakwater and the undulating gate type breakwater. The mooring device for mooring the door body is described.

Here, in the undulating gate type breakwater provided with the mooring device of Patent Document 1, since the air chamber is provided at the tip of the door body, the amount of air required to erect the door body can be relatively reduced. it can.

In addition, the laid-down door body is in a state where it can stand up due to the buoyancy of the air chamber, and the laid-down state is maintained by the mooring device. Therefore, when the mooring by the mooring device is released, the door body stands up due to the buoyancy of the air chamber.

Japanese Unexamined Patent Publication No. 2010-13309

By the way, in the undulating gate type breakwater of Patent Document 1, when the door body is once laid down for operation check or the like, in order for the laid-down door body to be able to stand up again, air is blown from the air supply device into the air chamber. It is necessary to supply and drain the water in the air chamber. The time required to supply the air chamber with the amount of air required for the door body to stand up depends on the air supply capacity of the air supply device.

Therefore, if the capacity of the air supply device is sufficiently increased, the time required for supplying air to the air chamber can be shortened. On the other hand, from an economic point of view, there is also a demand to reduce the capacity of the air supply device as much as possible.

The present application has been made in view of the above situation, and even when the capacity of the air supply device for supplying air to the air chamber inside the door body is not so high, the fallen door body can be quickly set up. The main purpose is to do.

The invention according to claim 1 includes a door body that stands up and falls down by rotating a movable end portion with a support end portion arranged on the water bottom as a fulcrum, and a mooring portion that moored the door body to the water bottom. A water bottom-mounted undulating gate in which the door body is located between a first buoyancy chamber arranged between the movable end portion and the support end portion, and between the first buoyancy chamber and the support end portion. A second buoyancy chamber arranged in the buoyancy chamber and a buoyancy chamber connecting portion for openly connecting the first buoyancy chamber and the second buoyancy chamber are provided, and the door body is moored to the mooring portion. The buoyancy chamber connection portion is opened in the overly laid state.

The invention according to claim 2 includes a door body that stands up and falls down by rotating the movable end portion with a support end portion arranged on the water bottom as a fulcrum, and a mooring portion that moored the door body to the water bottom. A water bottom-mounted undulating gate in which the door body is located between a first buoyancy chamber arranged between the movable end portion and the support end portion, and between the first buoyancy chamber and the support end portion. A second buoyancy chamber arranged in the above, and a buoyancy chamber connecting portion for connecting the first buoyancy chamber and the second buoyancy chamber so as to be openly provided. By replacing the air with water, the door body shifts from the moored state moored to the mooring portion to the overly laid state, and the door body becomes the overly laid state, so that the buoyancy The chamber connection portion is opened, and a part of the air in the second buoyancy chamber moves to the first buoyancy chamber via the buoyancy chamber connection portion, and the door body changes from the overturned state to the mooring state. The transition closes the buoyancy chamber connection.

The invention according to claim 3 is the bottom-mounted undulating gate according to claim 1 or 2, further comprising a door body contact portion installed on the water bottom, and the buoyancy chamber connecting portion is the first buoyancy. A partition wall opening provided in the partition wall between the chamber and the second buoyancy chamber and a partition wall gate that overlaps the partition wall opening and closes the partition wall opening are provided, and the door body is in the overturned state. The door body contact portion comes into contact with the partition wall gate to move the partition wall gate from a position overlapping the partition wall opening, and the buoyancy chamber connection portion is opened.

The invention according to claim 4 is the bottom-mounted undulating gate according to any one of claims 1 to 3, wherein the door body is in the overturned state and the buoyancy chamber connection portion is opened. As a result, the door body shifts from the overturned state to the moored state.

The invention according to claim 5 is the water bottom-mounted undulating gate according to any one of claims 1 to 4, wherein air is stored below the door body in the overturned state. A storage unit is further provided, and the air stored in the underwater storage unit is used to replenish the air in the second buoyancy chamber.

The invention according to claim 6 is the bottom-mounted undulating gate according to any one of claims 1 to 5, further comprising a buoyancy measuring unit for measuring the buoyancy force of the door body in the moored state. When the buoyancy force of the door body is less than a predetermined threshold value, air is supplied to the first buoyancy chamber.

The invention according to claim 7 is the bottom-mounted undulating gate according to any one of claims 1 to 6, further comprising an air supply unit for supplying air to the second buoyancy chamber, and said the first aspect. 1 The buoyancy chamber has a first opening that opens to the lower surface of the door body, the second buoyancy chamber has a second opening that opens to the lower surface of the door body, and the lower surface of the door body has the said A guide portion from the second opening to the first opening is provided, and the air supplied from the air supply portion to the second buoyancy chamber overflows downward from the second opening and is guided to the guide portion. It is supplied from the first opening to the first buoyancy chamber.

The invention according to claim 8 is the bottom-mounted undulating gate according to any one of claims 1 to 7, wherein the first buoyancy chamber in the upright door body has the first buoyancy chamber. An exhaust unit is provided to openly connect the buoyancy chamber and the outside of the door body, and the position of the exhaust port of the exhaust unit in the first buoyancy chamber is variable with respect to the thickness direction of the door body.

The invention according to claim 9 is a bottom-mounted undulating gate, which includes a door body that stands up and falls down by rotating a movable end portion with a support end portion arranged on the water bottom as a fulcrum, and the door body. A state in which the door body is provided with a buoyancy chamber arranged between the movable end portion and the support end portion, and the air supply portion is provided with an air supply pipe and an inverted state. than the door body is arranged on the lower side, the sheet advance reservoir to that of water in reservoir air of a predetermined amount supplied from the trachea, comprising a release air that is pre-stored in the water reservoir By doing so, the air stored in the underwater storage unit is supplied to the buoyancy chamber of the door body in the collapsed state, whereby air is pumped from the land equipment to the buoyancy chamber via the air supply pipe. Air is replenished to the buoyancy chamber more quickly than in the case of the above .

In the present invention, the fallen door body can be quickly returned to the moored state.

It is a vertical cross-sectional view of the undulating gate which concerns on one Embodiment. It is a perspective view which shows a part of the 2nd main surface of a door body. It is a perspective view which shows the vicinity of the movable end portion of a door body. It is a vertical sectional view of an undulating gate. It is a vertical sectional view of an undulating gate. It is a vertical sectional view of an undulating gate. It is a vertical sectional view of an undulating gate. It is a vertical sectional view of an undulating gate.

FIG. 1 is a vertical cross-sectional view showing an undulating gate 1 according to an embodiment of the present invention. The undulation gate 1 is a bottom-mounted undulation gate provided at the bottom of the entrance / exit of a harbor or a waterway in order to prevent a tsunami or a storm surge from flowing into the harbor or a waterway. In FIG. 1, parallel diagonal lines are omitted in a part of the configuration of the undulating gate 1. The same applies to FIGS. 4 to 8 described later.

In the following description, the side of the undulating gate 1 where water flows in during flooding (that is, the upstream side in the water inflow direction, for example, the offshore side of the undulating gate 1) is referred to as the "front side", and the undulating gate. The downstream side in the inflow direction of water in No. 1 (for example, the land side from the undulating gate 1) is referred to as "rear side". That is, the left-right direction in FIG. 1 is the "front-back direction", and the left and right sides in FIG. 1 are the "front side" and the "rear side", respectively. Further, the direction perpendicular to the paper surface in FIG. 1 is referred to as a "width direction". The width direction is perpendicular to the front-back direction, and the front-back direction and the width direction are vertical to the up-down direction. The vertical direction in FIG. 1 is substantially parallel to the gravitational direction.

The undulating gate 1 includes a box body 11, a door body 2, a mooring unit 31, a levitation force measuring unit 32, a door body contact unit 4, and an air supply unit 5. The box 11 is a structure having a recess 12 on the upper surface, and is embedded in the bottom of the water. The upper surface of the box 11 is located at substantially the same height as the bottom of the water. A door body 2, a mooring portion 31, a levitation force measuring portion 32, a door body contact portion 4, and the like are arranged in the recess 12 of the box body 11. The mooring unit 31 and the levitation force measuring unit 32 are installed, for example, on the front side surface of the recess 12. The door body contact portion 4 is installed, for example, on the bottom surface (that is, the bottom of the water) of the recess 12.

The door body 2 is a member having a substantially rectangular parallelepiped shape. The door body 2 stands up and falls down by rotating the movable end portion 24 with the rotation shaft J1 of the support end portion 23 arranged in the recess 12 (that is, on the bottom of the water) as a fulcrum. In the example shown in FIG. 1, the support end portion 23 is the rear end portion of the door body 2, and the movable end portion 24 is the front end portion of the door body 2. In FIG. 1, a state in which the door body 2 is laid down in water and moored by the mooring portion 31 is shown by a solid line. In the following description, the direction perpendicular to the width direction and connecting the support end portion 23 and the movable end portion 24 of the door body 2 is referred to as the "longitudinal direction" of the door body 2.

Further, in the following description, the state of the door body 2 shown by the solid line in FIG. 1 (that is, the posture of the door body 2) is referred to as a “mooring state”. In the moored door body 2, the longitudinal direction of the door body 2 is the same as the front-rear direction. Further, the state of the door body 2 indicated by the alternate long and short dash line in FIG. 1 is referred to as an "standing state". The moored door body 2 is brought into an upright state by rotating clockwise in FIG. 1 around a rotation axis J1 extending substantially parallel to the width direction when the mooring by the mooring portion 31 is released. When there is no difference in water level between the front and rear of the door body 2, the door body 2 is maintained in an upright state by the balance between its own weight and buoyancy. When the water levels before and after the door body 2 are different, the upright door body 2 is supported by, for example, a door body stopper or a tension rod (not shown). The angle formed by the upright door body 2 and the horizontal plane may be appropriately set within a range of more than 0 degrees and 90 degrees or less.

The moored door body 2 spreads in the front-rear direction and the width direction. As described above, the moored door body 2 is housed in the recess 12 of the box body 11. The vertical position of the upper surface of the moored door body 2 (hereinafter referred to as "first main surface 21") is substantially the same as the vertical position of the upper surface of the box 11 around the recess 12, for example. is there. The lower surface of the moored door body 2 (hereinafter, referred to as “second main surface 22”) is separated upward from the bottom surface of the recess 12. In the example shown in FIG. 1, the first main surface 21 and the second main surface 22 of the door body 2 are substantially flat plate-shaped members that are substantially vertical in the vertical direction.

The door body 2 includes a first buoyancy chamber 25, a second buoyancy chamber 26, a buoyancy chamber connection portion 27, and an exhaust portion 28. The first buoyancy chamber 25 is arranged between the movable end portion 24 and the support end portion 23 of the door body 2. The second buoyancy chamber 26 is arranged between the first buoyancy chamber 25 and the support end portion 23. The first buoyancy chamber 25 and the second buoyancy chamber 26 are formed by dividing the space between the first main surface 21 and the second main surface 22 by a partition wall 270 extending in the width direction. In the moored door body 2, the surface of the partition wall 270 on the first buoyancy chamber 25 side is inclined from the support end 23 to the movable end 24 as it goes from the first main surface 21 to the second main surface 22. It is a face.

The buoyancy chamber connecting portion 27 is arranged between the first buoyancy chamber 25 and the second buoyancy chamber 26, and connects the first buoyancy chamber 25 and the second buoyancy chamber 26 so as to be openable. When the door body 2 is in a moored state, an upright state, and a state between the moored state and the upright state, the buoyancy chamber connection portion 27 is closed, and the first buoyancy chamber 25 and the second buoyancy chamber 26 are Not in communication. When the door body 2 is in an overturned state, which will be described later, the buoyancy chamber connecting portion 27 is opened, and the first buoyancy chamber 25 and the second buoyancy chamber 26 communicate with each other via the buoyancy chamber connecting portion 27.

In the example shown in FIG. 1, the buoyancy chamber connecting portion 27 is provided on the partition wall 270 between the first buoyancy chamber 25 and the second buoyancy chamber 26. The buoyancy chamber connection portion 27 includes a partition wall opening 271 and a partition wall gate 272. The partition wall opening 271 is an opening provided in the partition wall 270. The partition gate 272 is, for example, a plate-shaped member larger than the partition opening 271 and overlaps the partition opening 271 to close the partition opening 271. The partition gate 272 is attached to the surface of the partition 270 on the first buoyancy chamber 25 side. The partition gate 272 is rotatable about a rotation shaft provided at the upper end portion. The lower end of the partition gate 272 is a movable end that can be separated from the partition 270. That is, the partition gate 272 is an upper hinge type flap gate.

In the moored door body 2, the surface of the partition wall 270 on the first buoyancy chamber 25 side is inclined as described above, so that the partition wall gate 272 comes into contact with the surface of the partition wall 270 on the first buoyancy chamber 25 side due to its own weight. Then, the partition wall opening 271 is closed. When the partition gate 272 rotates clockwise in FIG. 1 and separates from the partition 270, the partition gate 272 releases the partition opening 271 and the buoyancy chamber connection portion 27 is opened.

The first buoyancy chamber 25 has a first opening 251 that opens into the second main surface 22. The first opening 251 is arranged in the vicinity of the partition wall 270. In other words, the first opening 251 is provided on the second main surface 22 at the lower end of the first buoyancy chamber 25 in the upright door body 2. The first buoyancy chamber 25 has an airtight structure except for the first opening 251. In the example shown in FIG. 1, in the moored door body 2, the partition gate 272 of the buoyancy chamber connecting portion 27 is located above the first opening 251. In the door body 2, the buoyancy chamber connecting portion 27 can be accessed through the first opening 251.

The second buoyancy chamber 26 has a second opening 261 that opens into the second main surface 22. The second opening 261 is arranged in the vicinity of the support end portion 23. In other words, the second opening 261 is provided on the second main surface 22 at the lower end of the second buoyancy chamber 26 in the upright door body 2. In other words, the second opening 261 is provided at the end of the second buoyancy chamber 26 in the longitudinal direction opposite to the first buoyancy chamber 25. The second buoyancy chamber 26 has an airtight structure except for the second opening 261.

FIG. 2 is a perspective view showing a part of the second main surface 22 of the door body 2. FIG. 2 shows parts of the second main surface 22 in the vicinity of the first opening 251 and the second opening 261. Further, in FIG. 2, parallel diagonal lines are attached to the first opening 251 and the second opening 261. The first opening 251 and the second opening 261 are located, for example, at the center of the door body 2 in the width direction. The first opening 251 and the second opening 261 are, for example, substantially rectangular openings, respectively. The shapes of the first opening 251 and the second opening 261 may be changed in various ways.

A guide portion 221 from the first opening 251 to the second opening 261 is provided on the second main surface 22 of the door body 2 (that is, the lower surface of the door body 2 in the moored state). The guide portion 221 includes a pair of first guide members 222 and a pair of second guide members 223. The first guide member 222 and the second guide member 223 are plates that project substantially vertically downward from the second main surface 22 (that is, project toward the outside of the door body 2) in the moored door body 2, respectively. It is a member of the shape. In addition, in FIG. 1 and FIGS. 4 to 8 described later, the guide portion 221 is not shown.

The pair of first guide members 222 are arranged on both sides of the first opening 251 and the second opening 261 in the width direction, and extend substantially parallel to the longitudinal direction. The pair of guide portions 221 extend substantially parallel to the longitudinal direction from the front end of the first opening 251 to the rear end of the second opening 261 in the moored door body 2. The pair of second guide members 223 extend substantially parallel to the width direction. In the moored door body 2, one second guide member 223 is arranged along the front edge of the first opening 251 and the other second guide member 223 is along the rear edge of the second opening 261. Be placed. In other words, the pair of first guide members 222 and the pair of second guide members 223 surround a region extending in the longitudinal direction from the first opening 251 to the second opening 261 on the second main surface 22. In the guide unit 221, the pair of second guide members 223 may be omitted.

FIG. 3 is a perspective view showing the vicinity of the movable end 24 of the door body 2. In FIG. 3, a part of the first main surface 21 of the door body 2 is not shown. An exhaust portion 28 is provided at the movable end portion 24 of the door body 2 (that is, the upper end portion of the first buoyancy chamber 25 in the upright door body 2). The exhaust unit 28 connects the first buoyancy chamber 25 and the space outside the door body 2 so as to be openable. In the moored door body 2, the exhaust unit 28 is closed. In the example shown in FIG. 3, the exhaust unit 28 includes an exhaust pipe 281 and an exhaust valve 282.

The exhaust pipe 281 includes a first portion 283 extending in the longitudinal direction of the door body 2 and a second portion 284 extending in a direction substantially perpendicular to the first portion 283 from the end portion of the first portion 283. In other words, the exhaust pipe 281 is a substantially L-shaped pipe. The second portion 284 is arranged in the first buoyancy chamber 25. The second portion 284 shown by the broken line in FIG. 3 extends in the width direction substantially parallel to the first main surface 21 of the moored door body 2. The end opening of the second portion 284 is an exhaust port 285 in the first buoyancy chamber 25 of the exhaust portion 28. The first portion 283 penetrates the front end wall of the first buoyancy chamber 25 in the moored door body 2 and projects from the inside of the first buoyancy chamber 25 to the outside of the door body 2. The first portion 283 and the movable end portion 24 are hermetically and airtightly sealed.

The exhaust valve 282 is provided at the first portion 283 of the exhaust pipe 281, for example, outside the first buoyancy chamber 25. When the exhaust valve 282 is opened, the first buoyancy chamber 25 and the space outside the door body 2 communicate with each other via the exhaust pipe 281. When the exhaust valve 282 is closed, the first buoyancy chamber 25 and the space outside the door body 2 are not communicated with each other in the exhaust portion 28.

The exhaust pipe 281 is rotatable around the first portion 283 from the position indicated by the solid line and the broken line in FIG. 3 to the position indicated by the alternate long and short dash line. The second portion 284 indicated by the alternate long and short dash line in FIG. 3 extends in a direction away from the first main surface 21 of the moored door body 2 (that is, downward). In the exhaust unit 28, by rotating the exhaust pipe 281, the direction is perpendicular to the thickness direction of the door body 2 (that is, the longitudinal direction and the width direction of the door body 2, and the vertical direction in the moored door body 2). ), The position of the exhaust port 285 is changed.

The mooring portion 31 shown in FIG. 1 anchors the door body 2 to the bottom of the water by locking the movable end portion 24 of the door body 2 with a hook member or the like. In the moored door body 2 illustrated in FIG. 1, water exists on the bottom of the first buoyancy chamber 25 (that is, on the second main surface 22) up to about half the thickness of the door body 2. About half the capacity of the 1 buoyancy chamber 25 is stored in the upper part of the 1st buoyancy chamber 25. Further, a small amount of water is present on the bottom of the second buoyancy chamber 26 (that is, on the second main surface 22), and air is stored in almost the entire second buoyancy chamber 26.

In this way, in the moored door body 2, since air is stored in the first buoyancy chamber 25 and the second buoyancy chamber 26, the direction in which the door body 2 is levitated like the buoyancy of the door body 2. The force acting on the door body 2 is larger than the force acting in the direction of sinking the door body 2 such as the weight of the door body 2. In the following description, the force acting in the direction of ascending the door body 2 minus the force acting in the direction of sinking the door body 2 is referred to as "levitation force". In the moored door body 2, the levitation force generates a moment (hereinafter, referred to as “standing moment”) that acts in the direction in which the door body 2 stands up.

The levitation force measuring unit 32 measures the levitation force of the moored door body 2 by, for example, measuring the force applied from the door body 2 to the mooring unit 31. In the levitation force measuring unit 32, for example, the levitation force of the door body 2 is indirectly increased by estimating the force applied from the door body 2 to the mooring unit 31 based on the state of the mooring unit 31 (tilt of the hook member, etc.). It may be measured.

The door body contact portion 4 is arranged in a space below the moored door body 2 between the second main surface 22 of the door body 2 and the bottom surface of the recess 12. The door body contact portion 4 is, for example, a substantially cylindrical or substantially rectangular columnar member that projects substantially vertically upward from the bottom surface of the recess 12. The upper end of the door body contact portion 4 is located below the second main surface 22 of the moored door body 2, and the door body contact portion 4 is not in contact with the moored door body 2. The door body contact portion 4 is located below the first opening 251 of the moored door body 2. In other words, the door body contact portion 4 projects from the bottom surface of the recess 12 toward the first opening 251 of the moored door body 2. In other words, the door body contact portion 4 overlaps with the first opening 251 of the moored door body 2 in a plan view. In a plan view, the door body contact portion 4 is smaller than the first opening 251 of the moored door body 2.

The air supply unit 5 supplies air to the door body 2. The air supply unit 5 includes an underwater storage unit 51, a compressor 52, a pressure gauge 53, and an air supply pipe 54. The compressor 52 and the pressure gauge 53 are arranged on land. In FIG. 1, for convenience, the compressor 52 and the pressure gauge 53 are drawn above the water surface 91 outside the door body 2. The underwater storage portion 51 is arranged in the space between the second main surface 22 of the door body 2 and the bottom surface of the recess 12 below the door body 2 in the moored state (that is, the door body 2 in the collapsed state). .. The underwater storage portion 51 is fixed to the bottom surface of the recess 12. The upper end of the underwater storage portion 51 is located below the second main surface 22 of the moored door body 2. The underwater storage unit 51 is in non-contact with the moored door body 2. The air supply pipe 54 connects the compressor 52 and the underwater storage unit 51. In the air supply unit 5, by driving the compressor 52, air is supplied to the underwater storage unit 51 via the air supply pipe 54 and stored in the underwater storage unit 51.

The underwater storage portion 51 is a covered tubular member extending in the vertical direction, and opens downward. In the example shown in FIG. 1, the underwater storage unit 51 is a member having a substantially cylindrical shape with a lid. The air supplied from the compressor 52 to the underwater storage section 51 is stored in a space surrounded by the canopy portion and the side wall portion of the underwater storage section 51. The pressure gauge 53 is connected to, for example, the air supply pipe 54 and measures the pressure in the underwater storage unit 51.

The air supply unit 5 determines whether or not a predetermined amount of air is stored in the underwater storage unit 51 based on the value measured by the pressure gauge 53. When the amount of air in the underwater storage unit 51 is less than a predetermined amount, the compressor 52 is driven and air is supplied to the underwater storage unit 51. When the amount of air in the underwater storage section 51 reaches a predetermined amount, the compressor 52 is stopped. In the air supply unit 5, when the amount of air in the underwater storage unit 51 is less than a predetermined amount due to unintentional leakage of air from the underwater storage unit 51, the compressor 52 is based on the value measured by the pressure gauge 53. Is driven and air is supplied to the underwater storage section 51. As a result, it is possible to maintain a state in which a predetermined amount of air is stored in the underwater storage unit 51.

The underwater storage unit 51 is located below the second opening 261 of the moored door body 2. In other words, the underwater storage portion 51 projects from the bottom surface of the recess 12 toward the second opening 261 of the moored door body 2. The canopy of the underwater storage section 51 is provided with an air discharge port that releases the air inside the underwater storage section 51 by opening the canopy. The air outlet overlaps with the second opening 261 of the moored door body 2 in a plan view. The air stored in the underwater storage unit 51 is used to replenish the air in the second buoyancy chamber 26, as will be described later.

Next, the state of standing up and falling down of the door body 2 will be described with reference to FIGS. 4 to 8. As described above, in the moored state shown in FIG. 1, the door body 2 in which the standing moment acts due to the air or the like in the first buoyancy chamber 25 and the second buoyancy chamber 26 is moored by the mooring portion 31. In other words, the door body 2 shown by the solid line in FIG. 1 is in a standing standby state. At the undulating gate 1, when the mooring portion 31 releases the mooring of the door body 2, the door body 2 rotates clockwise in FIG. 1 and stands up as shown in FIG. The upper portion of the upright door body 2 projects upward from the water surface 91 outside the door body 2. The water surface 91 is located above the first opening 251 of the door body 2. As described above, the upright door body 2 is supported from the front by the door body stopper (not shown) that stands up on the front side of the door body 2.

In the upright door body 2, water exists in the lower part of the first buoyancy chamber 25 up to about half the length of the first buoyancy chamber 25 in the longitudinal direction, which is about half the capacity of the first buoyancy chamber 25. Air is stored in the upper part of the first buoyancy chamber 25. Further, in the lower part of the second buoyancy chamber 26, for example, a small amount of water exists up to the vicinity of the upper end of the second opening 261, and almost the entire second buoyancy chamber 26 (specifically, the upper end of the second opening 261). Air is stored in the area above the neighborhood. The bulkhead gate 272 of the buoyancy chamber connecting portion 27 is placed on the bulkhead 270 by its own weight and overlaps the bulkhead opening 271. Therefore, the buoyancy chamber connection portion 27 is closed, and the air in the second buoyancy chamber 26 does not move to the first buoyancy chamber 25. The partition gate 272 is not lifted by the pressure of the air in the second buoyancy chamber 26.

When the upright door body 2 falls down, first, the above-mentioned door body stopper separates from the door body 2 and falls down on the bottom surface of the recess 12. Subsequently, when the exhaust unit 28 is opened, water flows into the first buoyancy chamber 25 from the first opening 251 located below the water surface 91, and the air in the first buoyancy chamber 25 is exhausted from the exhaust unit 28. It is discharged to the outside of the door body 2 via. In other words, the air in the first buoyancy chamber 25 is replaced with water. As described above, since the buoyancy chamber connecting portion 27 is closed, the water in the first buoyancy chamber 25 does not flow into the second buoyancy chamber 26 via the buoyancy chamber connecting portion 27.

In the upright door body 2, the air in the first buoyancy chamber 25 is replaced with water, so that the weight of the door body 2 becomes larger than the buoyancy acting on the door body, and the door body 2 starts to fall down. .. As shown in FIG. 5, the door body 2 falls down toward the bottom of the water in a state where most of the air in the first buoyancy chamber 25 is released, and the position shown in FIG. 1 (hereinafter, also referred to as “mooring position”). After passing.), As shown in FIG. 6, the state shifts from the moored state to the lodging state (hereinafter, referred to as “over-lying state”). The predetermined amount of air is stored in advance in the underwater storage unit 51 located below the door body 2 in the overturned state.

In the door body 2 in the overturned state, a small amount of air remains in the upper part of the first buoyancy chamber 25, and water is present in most of the first buoyancy chamber 25. Further, a small amount of water exists on the bottom of the second buoyancy chamber 26, and air is stored in almost the entire second buoyancy chamber 26. While the door body 2 is lying down, in the first buoyancy chamber 25, air in the first buoyancy chamber 25 passes through the exhaust portion 28 until the exhaust port 285 (see FIG. 3) of the exhaust portion 28 is submerged. It flows out to the outside of the door body 2. Therefore, the amount of air remaining in the first buoyancy chamber 25 in the overturned door body 2 is adjusted by changing the position of the exhaust port 285. The exhaust valve 282 (see FIG. 3) of the exhaust unit 28 is closed before the door body 2 is in the overturned state or at the same time when the door body 2 is in the overturned state. The exhaust valve 282 is closed, for example, before the door body 2 passes the mooring position and becomes overturned.

When the door body 2 is in the overturned state, the upper end portion of the door body contact portion 4 enters the first buoyancy chamber 25 through the first opening 251. The upper end portion of the door body contact portion 4 contacts the lower end portion of the partition wall gate 272 in the first buoyancy chamber 25, and the lower end portion of the partition wall gate 272 moves upward. As a result, the partition gate 272 rotates clockwise in FIG. 6 about the rotation axis of the upper end portion, and moves from a position overlapping the partition opening 271 to a position away from the partition opening 271. As a result, the buoyancy chamber connecting portion 27 is automatically opened in the overturned door body 2.

When the buoyancy chamber connection portion 27 is opened, a part of the air in the second buoyancy chamber 26 moves to the first buoyancy chamber 25 through the partition wall opening 271 of the buoyancy chamber connection portion 27. In the first buoyancy chamber 25, an amount of water corresponding to the inflow of air from the second buoyancy chamber 26 flows out from the first opening 251 and the partition wall opening 271. In the second buoyancy chamber 26, an amount of water corresponding to the amount of air that has moved to the first buoyancy chamber 25 flows into the second buoyancy chamber 26 from the partition wall opening 271 and the second opening 261.

As a result, as shown in FIG. 7, about half the capacity of the first buoyancy chamber 25 is stored in the upper part of the first buoyancy chamber 25. Further, on the bottom of the first buoyancy chamber 25, water exists up to about half the thickness of the door body 2. In the second buoyancy chamber 26, water exists on the bottom up to about half the thickness of the door body 2, and about half the capacity of the second buoyancy chamber 26 is stored in the upper part of the second buoyancy chamber 26. ing.

As the air moves from the second buoyancy chamber 26 to the first buoyancy chamber 25, the standing moment acting on the door body 2 increases, and the door body 2 rotates from the overturned state to the mooring position shown in FIG. And move. The door body 2 that has moved to the mooring position is moored by the mooring unit 31 and is in a moored state. The moored door body 2 shown in FIG. 8 has a levitation force and is in a standby state in which it can stand up.

As the door body 2 shifts from the overturned state to the moored state, the door body contact portion 4 separates from the partition wall gate 272. As a result, the partition gate 272 rotates due to its own weight and returns to a position where it overlaps with the partition opening 271 and closes the partition opening 271. As a result, the buoyancy chamber connection 27 is automatically closed.

After that, when the air discharge port of the underwater storage unit 51 is opened, the air previously stored in the underwater storage unit 51 flows out upward and is supplied to the second buoyancy chamber 26 through the second opening 261. Will be done. As a result, the levitation force of the door body 2 increases. The amount of air supplied from the underwater storage unit 51 to the second buoyancy chamber 26 is, for example, the air that has moved from the second buoyancy chamber 26 to the first buoyancy chamber 25 with the buoyancy chamber connection portion 27 open. (Hereinafter referred to as "moving air amount"). A predetermined amount of air equal to or larger than the amount of moving air is stored in advance in the underwater storage unit 51.

In the second buoyancy chamber 26, an amount of water corresponding to the inflow amount of air from the underwater storage section 51 flows out from the second opening 261. As a result, as shown in FIG. 1, air is stored in almost the entire second buoyancy chamber 26. A small amount of water is present on the bottom of the second buoyancy chamber 26. As described above, since the buoyancy chamber connecting portion 27 is closed, the air in the second buoyancy chamber 26 does not move to the first buoyancy chamber 25 via the buoyancy chamber connecting portion 27.

At the undulating gate 1, the levitation force of the door body 2 is continuously measured by the levitation force measuring unit 32. When the door body 2 has a predetermined buoyancy force by replenishing the second buoyancy chamber 26 with air from the underwater storage section 51 as described above, the door is based on the output from the buoyancy force measuring section 32. It is determined that the body 2 is in a moored state having a predetermined buoyancy. When the door body 2 is in a moored state having a predetermined buoyancy force, the supply of air from the underwater storage unit 51 to the second buoyancy chamber 26 is stopped. Further, air is supplied to the underwater storage unit 51 by the compressor 52 of the air supply unit 5 and stored in the underwater storage unit 51. Even after the door body 2 is in a moored state having a predetermined buoyancy force, the air discharge port of the underwater storage unit 51 is slightly opened, and the air slowly leaking from the underwater storage unit 51 is the second buoyancy chamber 26. May be continuously supplied to.

As described above, the undulating gate 1 includes a door body 2 and a mooring portion 31. The door body 2 stands up and falls down by rotating the movable end portion 24 with the support end portion 23 arranged on the bottom of the water as a fulcrum. The mooring unit 31 moored the door body 2 to the bottom of the water. The door body 2 includes a first buoyancy chamber 25, a second buoyancy chamber 26, and a buoyancy chamber connecting portion 27. The first buoyancy chamber 25 is arranged between the movable end portion 24 and the support end portion 23. The second buoyancy chamber 26 is arranged between the first buoyancy chamber 25 and the support end portion 23. The buoyancy chamber connecting portion 27 connects the first buoyancy chamber 25 and the second buoyancy chamber 26 so as to be openable. The buoyancy chamber connecting portion 27 is opened in an overly laid state in which the door body 2 is laid down more than in the moored state in which the door body 2 is moored to the mooring portion 31.

As a result, the door body 2 that has fallen down from the standing state can be quickly returned to the mooring state (that is, the standing standby state). As a result, the function loss period of the undulating gate 1 (that is, the period during which the door body 2 cannot be erected) can be shortened, and the safety of the port or the like where the undulating gate 1 is installed can be improved.

As described above, in the undulating gate 1, the door body 2 in the upright state is more than the moored state in which the door body 2 is moored in the mooring portion 31 by replacing the air in the first buoyancy chamber 25 with water. It shifts to the overly depressed state. When the door body 2 is in an overturned state, the buoyancy chamber connection portion 27 is opened, and a part of the air in the second buoyancy chamber 26 moves to the first buoyancy chamber 25 via the buoyancy chamber connection portion 27. To do. Then, the door body 2 moves from the overturned state to the moored state, so that the buoyancy chamber connecting portion 27 is closed. As a result, as described above, the door body 2 that has fallen down from the standing state can be quickly returned to the mooring state. As a result, the period of loss of function of the undulating gate 1 can be shortened, and the safety of the port or the like where the undulating gate 1 is installed can be improved.

The undulating gate 1 further includes a door body contact portion 4 installed on the bottom of the water. The buoyancy chamber connection portion 27 includes a partition wall opening 271 and a partition wall gate 272. The partition wall opening 271 is provided in the partition wall 270 between the first buoyancy chamber 25 and the second buoyancy chamber 26. The bulkhead gate 272 overlaps the bulkhead opening 271 and closes the bulkhead opening 271. When the door body 2 is in an overturned state, the door body contact portion 4 comes into contact with the partition wall gate 272 and moves the partition wall gate 272 from a position overlapping the partition wall opening 271. As a result, the buoyancy chamber connection portion 27 is opened. As described above, in the undulating gate 1, the buoyancy chamber connecting portion 27 can be automatically opened without power by utilizing the change in the posture of the door body 2. As a result, the structure of the undulating gate 1 can be simplified as compared with the case where the opening mechanism of the buoyancy chamber connecting portion 27 is remotely driven by electric power or the like. It is also possible to reduce the failure rate of the undulating gate 1.

At the undulating gate 1, the door body 2 is in an overly laid state and the buoyancy chamber connecting portion 27 is opened, so that the door body 2 shifts from the overly laid state to the moored state. As described above, in the undulating gate 1, the door body 2 can be quickly returned to the moored state without supplying air from the outside to the door body 2 in the overly laid state.

The undulating gate 1 further includes an underwater storage unit 51 that stores air below the overly laid door body 2. The air stored in the underwater storage unit 51 is used to replenish the air in the second buoyancy chamber 26. In this way, since the air can be supplied to the second buoyancy chamber 26 only by discharging the air stored in the underwater storage unit 51 into the water, the second buoyancy chamber 26 is compared with the case where the air is pumped from the land equipment or the like. The buoyancy chamber 26 can be quickly replenished with air. Further, the underwater storage portion 51 is in the shape of a covered cylinder and opens downward. As a result, the required amount of air can be easily stored in the underwater storage unit 51 while simplifying the structure of the underwater storage unit 51.

In the undulating gate 1, an exhaust unit 28 is provided at the upper end of the first buoyancy chamber 25 in the upright door body 2 to openly connect the first buoyancy chamber 25 and the outside of the door body 2. The position of the exhaust port 285 in the first buoyancy chamber 25 of the exhaust unit 28 is variable with respect to the thickness direction of the door body 2. Thereby, the amount of air remaining in the first buoyancy chamber 25 when the door body 2 falls down can be easily adjusted. In other words, the amount of water flowing into the first buoyancy chamber 25 when the door body 2 falls down can be adjusted. As a result, an appropriate amount of air required for the door body 2 to quickly return to the moored state can be left in the first buoyancy chamber 25 of the door body 2 in the overturned state. Further, by leaving an appropriate amount of air in the first buoyancy chamber 25, the lodging speed of the door body 2 when the door body 2 is in an overly laid state (that is, when the door body 2 is landed on the water bottom) is determined. It can be suppressed and the impact applied to the door body 2 at the time of landing can be reduced.

At the undulating gate 1, for example, it is conceivable that earth and sand carried by the water stream accumulate on the moored door body 2 to reduce the levitation force of the door body 2. In this case, the measured value of the levitation force of the door body 2 output from the levitation force measuring unit 32 decreases. When the measured value becomes less than a predetermined threshold value, air is supplied from the air supply unit 5 to the first buoyancy chamber 25. Specifically, the air discharge port of the underwater storage unit 51 is opened, and first, air is supplied to the second buoyancy chamber 26. As a result, a small amount of water remaining in the second buoyancy chamber 26 flows out through the second opening 261 and the second buoyancy chamber 26 is filled with air. Then, the air that overflows downward from the second opening 261 (that is, the air that overflows from the inside of the second buoyancy chamber 26 through the second opening 261 and can flow into the second buoyancy chamber 26 from the second opening 261). The air that was not present) is guided to the first opening 251 along the second main surface 22 by the guide portion 221 and is supplied from the first opening 251 to the first buoyancy chamber 25. As a result, the levitation force of the door body 2 increases. When the measured value of the levitation force by the levitation force measuring unit 32 becomes equal to or higher than the above threshold value, the supply of air from the underwater storage unit 51 is stopped.

As described above, the undulating gate 1 further includes a levitation force measuring unit 32 for measuring the levitation force of the moored door body 2. Thereby, it is possible to confirm whether or not the door body 2 is in a state in which the door body 2 can stand up without actually standing up. Further, in the undulating gate 1, when the buoyancy force of the door body 2 is less than a predetermined threshold value, air is supplied to the first buoyancy chamber 25. As a result, even when the levitation force of the door body 2 is reduced due to the earth and sand accumulated on the door body 2, the levitation force of the door body 2 can be easily and quickly recovered.

As described above, the undulating gate 1 further includes an air supply unit 5 that supplies air to the second buoyancy chamber 26. The first buoyancy chamber 25 has a first opening 251 that opens to the second main surface 22 of the door body 2 (that is, the lower surface of the door body 2 in a prone state). The second buoyancy chamber 26 has a second opening 261 that opens into the second main surface 22 of the door body 2. A guide portion 221 from the second opening 261 to the first opening 251 is provided on the second main surface 22 of the door body 2. Then, the air supplied from the air supply unit 5 to the second buoyancy chamber 26 overflows downward from the second opening 261 and is guided by the guide unit 221 to be supplied from the first opening 251 to the first buoyancy chamber 25. .. As a result, air can be supplied to the first buoyancy chamber 25 by a simple structure by utilizing a mechanism for supplying air to the second buoyancy chamber 26 (that is, an underwater storage unit 51 or the like).

Various changes can be made in the above-mentioned undulating gate 1.

For example, in the exhaust unit 28, the structure for changing the position of the exhaust port 285 with respect to the thickness direction of the door body 2 may be changed in various ways. For example, in the first buoyancy chamber 25, a plurality of exhaust ports 285 are provided at different positions in the thickness direction of the door body 2, and one of the plurality of exhaust ports 285 is selectively used. Thereby, the position of the exhaust port 285 with respect to the thickness direction of the door body 2 may be made variable. In the undulating gate 1, the position of the exhaust port 285 does not necessarily have to be variable and may be fixed.

The partition gate 272 does not necessarily have to be an upper hinge type flap gate, and may be a gate having various structures. For example, the bulkhead gate 272 may be a slide gate that slides along the bulkhead 270. Alternatively, the partition gate 272 may be a roller gate in which rollers are attached to both sides in the width direction and the rollers move along the partition 270 as the rollers rotate.

The amount of air supplied from the underwater storage unit 51 to the second buoyancy chamber 26 after the door body 2 shifts from the overturned state to the moored state is the first amount of air supplied from the second buoyancy chamber 26 to the second buoyancy chamber 26 via the buoyancy chamber connection portion 27. It may be larger than the amount of air that has moved to the buoyancy chamber 25 (that is, the amount of moving air). In this case, the air overflowing downward from the second opening 261 is guided to the first opening 251 along the second main surface 22 by, for example, the guide portion 221 and from the first opening 251 to the first buoyancy chamber 25. Be supplied.

In the above example, in the door body 2 in the overturned state, a part of the air in the second buoyancy chamber 26 moves to the first buoyancy chamber 25 via the buoyancy chamber connection portion 27, so that the door body 2 is moored. Although the door body 2 shifts to the moored state, the door body 2 does not necessarily have to shift to the moored state only by the movement of air between the buoyancy chambers. For example, even after a part of the air in the second buoyancy chamber 26 moves to the first buoyancy chamber 25 via the buoyancy chamber connecting portion 27, the door body 2 may be maintained in the overturned state. In this case, the door body 2 shifts from the overly laid state to the moored state by supplying air from the underwater storage unit 51 to the second buoyancy chamber 26 of the overly laid door body 2. Alternatively, after air is supplied from the underwater storage unit 51 to the second buoyancy chamber 26 of the door body 2 in the overturned state and the second buoyancy chamber 26 is filled with air, the air overflowing downward from the second opening 261 is generated. The door body 2 may shift from the overturned state to the moored state by being guided by the guide portion 221 and being supplied from the first opening 251 to the first buoyancy chamber 25.

The structure of the guide portion 221 that guides the air overflowing downward from the second opening 261 to the first opening 251 may be changed in various ways. For example, a substantially semi-cylindrical member extending in the longitudinal direction may be attached to the second main surface 22 of the door body 2 as a guide portion 221 extending from the second opening 261 to the first opening 251. In this case, the air overflowing downward from the second opening 261 passes through a substantially semi-cylindrical space between the substantially semi-cylindrical member and the second main surface 22, and is guided to the first opening 251. , Is supplied to the first buoyancy chamber 25 through the first opening 251.

The supply of air from the air supply unit 5 to the first buoyancy chamber 25 does not necessarily have to go through the guide unit 221. For example, another underwater storage unit 51 is provided below the first opening 251 of the moored door body 2, and air is directly supplied from the other underwater storage unit 51 to the first buoyancy chamber 25. You may. In this case, the guide unit 221 may be omitted.

The shape of the underwater storage portion 51 does not necessarily have to be a covered cylinder that opens downward, and may be changed in various ways. For example, the underwater storage unit 51 may be an airtight tank that does not open to the outside. Further, the air supply from the air supply unit 5 to the second buoyancy chamber 26 does not necessarily have to go through the underwater storage unit 51. For example, the air delivered from the compressor 52 may be directly supplied to the second buoyancy chamber 26 via a pipe connecting the compressor 52 and the second buoyancy chamber 26.

The structure of the buoyancy chamber connection portion 27 may be changed in various ways. The buoyancy chamber connecting portion 27 may include, for example, a pipe connecting the first buoyancy chamber 25 and the second buoyancy chamber 26, and a valve provided in the pipe. In this case, when the door body 2 is in an overturned state, the door body contact portion 4 comes into contact with the drive portion of the valve to open the valve. As a result, a part of the air in the second buoyancy chamber 26 moves to the first buoyancy chamber 25. Then, when the door body 2 shifts from the overturned state to the moored state, the door body contact portion 4 is separated from the driving portion of the valve, and the valve is closed.

Further, the opening and closing of the buoyancy chamber connecting portion 27 does not necessarily have to be performed by the contact and separation of the door body contact portion 4. For example, a sensor for detecting whether or not the door body 2 is in the overturned state is provided in the box 11 or the like, and when the sensor detects that the door body 2 is in the overturned state, the valve described above is used. The drive unit (eg, an electric valve) may be driven based on the output from the sensor to open the valve. Then, when the door body 2 shifts from the overturned state to the moored state, the drive unit of the valve is driven based on the output from the sensor, and the valve is closed.

The structure of the air supply unit 5 described above can be applied to any bottom-mounted undulating gate having one or more buoyancy chambers inside the door. The bottom-mounted undulating gate includes a door body that stands up and falls down by rotating the movable end portion with a support end portion arranged on the water bottom as a fulcrum, and an air supply unit that supplies air to the door body. .. The door body includes a buoyancy chamber arranged between the movable end and the support end. The air supply unit includes an underwater storage unit that has a lid and is cylindrical and opens downward to store air below the door body in a collapsed state. Then, the air stored in the underwater storage unit is supplied to the buoyancy chamber of the door body in the collapsed state.

In this way, the bottom-mounted undulating gate can supply air to the buoyancy chamber simply by discharging the air stored in the underwater storage section into the water, so compared to the case where air is pumped from land equipment or the like. Therefore, air can be quickly supplied to the fallen door body. In addition, the required amount of air can be easily stored in the underwater storage unit while simplifying the structure of the underwater storage unit. The bottom-mounted undulating gate may or may not be provided with a mooring portion for mooring the door body. Further, the number of buoyancy chambers may be one or two or more.

The above-described embodiment and the configurations in each modification may be appropriately combined as long as they do not conflict with each other.

1 Undulating gate 2 Door body 4 Door body contact part 5 Air supply part 22 (of the door body) 2nd main surface 23 Support end part 24 Movable end part 25 1st buoyancy chamber 26 2nd buoyancy chamber 27 Buoyancy chamber connection part 28 Exhaust Part 31 Mooring part 32 Buoyancy measuring part 51 Underwater storage part 221 Guide part 251 First opening 261 Second opening 270 Partition 271 Partition opening 272 Partition gate 285 Exhaust port

Claims (9)

A door body that stands up and falls down when the movable end rotates around the support end arranged on the bottom of the water as a fulcrum.
A bottom-mounted undulating gate provided with a mooring portion for mooring the door body to the bottom of the water.
The door body
A first buoyancy chamber arranged between the movable end and the support end,
A second buoyancy chamber arranged between the first buoyancy chamber and the support end portion,
A buoyancy chamber connecting portion that connects the first buoyancy chamber and the second buoyancy chamber so as to be openly
With
A bottom-mounted undulating gate characterized in that the buoyancy chamber connection portion is opened in an overly laid state in which the door body is laid down more than in a moored state in which the door body is moored at the mooring portion. A door body that stands up and falls down when the movable end rotates around the support end arranged on the bottom of the water as a fulcrum.
A bottom-mounted undulating gate provided with a mooring portion for mooring the door body to the bottom of the water.
The door body
A first buoyancy chamber arranged between the movable end and the support end,
A second buoyancy chamber arranged between the first buoyancy chamber and the support end portion,
A buoyancy chamber connecting portion that connects the first buoyancy chamber and the second buoyancy chamber so as to be openly
With
By replacing the air in the first buoyancy chamber with water in the upright door body, the door body shifts to an overly laid state in which the door body is more depressed than the moored state moored in the mooring portion.
When the door body is in the overturned state, the buoyancy chamber connection portion is opened, and a part of the air in the second buoyancy chamber moves to the first buoyancy chamber via the buoyancy chamber connection portion. ,
A bottom-mounted undulating gate characterized in that the buoyancy chamber connection portion is closed when the door body shifts from the overturned state to the moored state. The bottom-mounted undulating gate according to claim 1 or 2.
Further equipped with a door contact part installed on the bottom of the water,
The buoyancy chamber connection part
A partition wall opening provided in the partition wall between the first buoyancy chamber and the second buoyancy chamber,
A bulkhead gate that overlaps the bulkhead opening and closes the bulkhead opening,
With
When the door body is in the overturned state, the door body contact portion comes into contact with the partition wall gate to move the partition wall gate from a position overlapping the partition wall opening, and the buoyancy chamber connection portion is opened. A bottom-mounted undulating gate featuring. The bottom-mounted undulating gate according to any one of claims 1 to 3.
A bottom-mounted undulating gate characterized in that the door body shifts from the overly laid state to the moored state when the door body is in the overturned state and the buoyancy chamber connection portion is opened. The bottom-mounted undulating gate according to any one of claims 1 to 4.
An underwater storage unit for storing air below the overturned door body is further provided.
A bottom-mounted undulating gate characterized in that the air stored in the underwater storage unit is used to replenish the air in the second buoyancy chamber. The bottom-mounted undulating gate according to any one of claims 1 to 5.
A levitation force measuring unit for measuring the levitation force of the door body in the moored state is further provided.
A bottom-mounted undulating gate characterized in that air is supplied to the first buoyancy chamber when the buoyancy force of the door body is less than a predetermined threshold value. The bottom-mounted undulating gate according to any one of claims 1 to 6.
An air supply unit for supplying air to the second buoyancy chamber is further provided.
The first buoyancy chamber has a first opening that opens to the lower surface of the door body.
The second buoyancy chamber has a second opening that opens to the lower surface of the door body.
A guide portion from the second opening to the first opening is provided on the lower surface of the door body.
The air supplied from the air supply unit to the second buoyancy chamber overflows downward from the second opening and is guided by the guide unit to be supplied from the first opening to the first buoyancy chamber. A characteristic undulating gate installed on the bottom of the water. The bottom-mounted undulating gate according to any one of claims 1 to 7.
An exhaust unit is provided at the upper end of the first buoyancy chamber in the upright door body to openly connect the first buoyancy chamber and the outside of the door body.
A bottom-mounted undulating gate characterized in that the position of the exhaust port of the exhaust portion in the first buoyancy chamber is variable with respect to the thickness direction of the door body. It is a bottom-mounted undulating gate
A door body that stands up and falls down when the movable end rotates around the support end arranged on the bottom of the water as a fulcrum.
An air supply unit that supplies air to the door body and
With
The door body includes a buoyancy chamber arranged between the movable end portion and the support end portion.
The air supply unit
Air supply pipe and
Disposed on the lower side of the door body of the laid-down state, the water in the reservoir you previously storing the supplied predetermined amount of air from the supply pipe,
With
By releasing the air stored in advance in the underwater storage unit, the air stored in the underwater storage unit is supplied to the buoyancy chamber of the door body in the collapsed state, whereby the air stored in the underwater storage unit is supplied from the land equipment. A bottom-mounted undulating gate characterized in that air is quickly replenished to the buoyancy chamber as compared with the case where air is pumped to the buoyancy chamber via the air supply pipe.

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