JP4987750B2 - Flap gate - Google Patents

Description

  The present invention relates to a flap gate provided as a breakwater in a port, a waterway or the like in order to prevent damage caused by a tsunami or storm surge.

  A flap gate that functions as a breakwater is provided to prevent a tsunami or storm surge from flowing in from a port or waterway entrance when a tsunami or storm surge occurs.

  The flap gate becomes a large-scale device, and extremely large power is required to open and close the flap gate.

  For this reason, as shown in Patent Document 1, the door of the flap gate has a sealed hollow structure, and when the flap gate is closed, the inside of the door is filled with air from the supply device outside the door, When the door body is erected by buoyancy and the flap gate is opened, the inside of the door body is replaced with air from water, and the door body is laid down without buoyancy.

  A conventional flap gate will be described with reference to FIG.

  A box 2 for supporting and storing the door body 1 on the sea floor is constructed.

  In the box 2, a door body storage portion 3 is recessed according to the shape of the door body 1, and a door bottom storage recess 4 is continuously formed in the door body storage portion 3. A rotation support portion 5 is provided on the bottom surface of the door body storage portion 3, and the door body 1 is rotatably supported by the rotation support portion 5.

  The door butt portion of the door body 1 is rotated in the door butt storage recess 4 by the rotation of the door body 1, and the door body 1 is brought into contact with the flange portion 10 protruding above the door butt storage recess 4. The rotation is constrained by contact.

  A skin plate is provided on the entire lower surface of the door body 1 (the surface outside the bay in the standing state), and the upper surface of the door body 1 is constituted by a frame material and is open. Further, a buoyancy chamber 6 which is an airtight space is formed at the tip of the door body 1.

  An air / water storage chamber 7 is formed inside the box 2, and the air / water storage chamber 7 and the buoyancy chamber 6 are connected by an air pipe 8 and a water pipe 9.

  The base end of the air pipe 8 opens to the upper part of the air / water storage chamber 7, and the tip opens to the uppermost position of the buoyancy chamber 6 or the vicinity thereof. The proximal end of the water pipe 9 opens to the lower part of the air / water storage chamber 7, and the distal end opens to the lowest position of the buoyancy chamber 6 or in the vicinity thereof.

  The air pipe 8 is provided with a first on-off valve 11, and the water pipe 9 is provided with a second on-off valve 12 and a third on-off valve 13. The first on-off valve 11, the second on-off valve 12, and the third on-off valve 13 are remotely operated solenoid valves, electric valves, air operated valves, and the like. The third on-off valve 13 opens and closes the branch of the water pipe 9 to communicate with external water.

  The opening / closing operation of the flap gate will be described with reference to FIGS.

  FIG. 11 shows a standby state, in which the buoyancy chamber 6 is filled with water and the air / water storage chamber 7 is filled with air. In order to fill the air / water storage chamber 7 with air, the water in the air / water storage chamber 7 is drained by a drainage means such as a pump and replenished with air from outside.

  In order to float the door body 1, the first on-off valve 11 and the second on-off valve 12 are opened with the third on-off valve 13 closed.

  Due to the water head difference, the water in the buoyancy chamber 6 flows down to the air / water storage chamber 7 through the water pipe 9, and at the same time, the air in the air / water storage chamber 7 passes through the air pipe 8. It flows into the buoyancy chamber 6. Thus, the water in the buoyancy chamber 6 is replaced with air, and buoyancy is applied to the tip of the door body 1, that is, the rotational force in the standing direction of the door body 1 is applied. The part floats on the water surface (FIG. 12).

  In the state where the door body 1 is lifted, the first on-off valve 11 and the second on-off valve 12 are closed to enclose air in the buoyancy chamber 6 (FIG. 12).

  Next, when the water level rises, the buoyancy chamber 6 rises following the rise of the water level, and the door body 1 rises to prevent water from flowing beyond the front end of the door body 1 (FIG. 13).

  Next, when the door body 1 is laid down (sedged), the second on-off valve 12 is closed, the first on-off valve 11 and the third on-off valve 13 are opened, and the air / water storage chamber 7 is opened. It communicates with the atmosphere by piping or the like (not shown) (FIG. 14).

  Air in the buoyancy chamber 6 is released to the atmosphere through the air pipe 8 and the air / water storage chamber 7, and the buoyancy chamber 6 has ambient water through the third on-off valve 13 and the water pipe 9. Flows in. Eventually, the buoyancy chamber 6 is filled with water, and the door body 1 sinks.

  As described above, the water stored in the air / water storage chamber 7 drains the water in the air / water storage chamber 7 by a draining means such as a pump. At the same time, air is replenished from the outside, and the air / water storage chamber 7 is filled with air to enter a standby state.

  The flap gate has a structure in which air necessary for the floating operation of the door body 1 is stored in the air / water storage chamber 7 in the box 2, so that the air / water storage chamber 7 is stored in the box 2. Therefore, there is a problem that the construction becomes large and the construction cost becomes high.

JP 2003-201710 A

  In view of such a situation, the present invention simplifies the flap gate and the accompanying structure without giving the box an accompanying function such as an air chamber, and reduces the cost.

  The present invention rotatably supports a door body on the bottom of the water, provides a buoyancy chamber on the distal end side from the rotation center of the door body, and provides an air storage container on the base end side from the buoyancy chamber. By connecting the buoyancy chamber with an air pipe having an open / close valve, the buoyancy chamber is filled with water, the door body is in a collapsed state, and the open / close valve is opened to communicate the buoyancy chamber with the air storage container. The flap gate is configured such that air flows into the buoyancy chamber from the air storage container, the buoyancy chamber is replaced with air, and the door body is erected.

  According to the present invention, the door body has a hollow structure at least at the tip, the buoyancy chamber is formed at the tip, and the air storage container is a pressure accumulation tank provided at the base of the door. It concerns the flap gate.

  Further, in the present invention, the door body has at least a distal end portion and a proximal end portion having a hollow structure, the buoyancy chamber is formed at the distal end portion, and the air storage container is formed by the proximal end portion. It is related to.

  Further, the present invention relates to a flap gate in which at least the middle part of the door body has a hollow structure, and the buoyancy chamber is formed in the middle part.

  The present invention also relates to a flap gate in which a release valve is provided in the buoyancy chamber, the air in the buoyancy chamber can be discharged through the release valve, and the buoyancy chamber can be refilled with water. Is.

  According to the present invention, the door body is rotatably supported on the bottom of the water, the buoyancy chamber is provided on the distal end side from the rotation center of the door body, and the air storage container is provided on the proximal end side from the buoyancy chamber, the air storage container And the buoyancy chamber are connected by an air pipe having an on-off valve, and the buoyancy chamber is filled with water and the door body is in a lying state, and the on-off valve is opened to communicate the buoyancy chamber and the air storage container. Thus, since air flows into the buoyancy chamber from the air storage container, the buoyancy chamber is replaced with air, and the door body is configured to stand up, there is no need to provide the air storage container in the box, It is possible to reduce the construction scale of the box and achieve the excellent effect of reducing the construction cost.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  A first embodiment of the present invention will be described with reference to FIGS.

  First, the configuration of the flap gate according to the first embodiment will be described with reference to FIG. 1 to 5, the same components as those shown in FIG. 11 are denoted by the same reference numerals.

  The box body 2 constructed on the sea floor is provided with a door body storage portion 3 and a door bottom storage recess 4 continuous to the door body storage portion 3, and a rotation support portion 5 is provided on the bottom surface of the door body storage portion 3. The door body 1 is rotatably supported by the rotation support portion 5. An inspection gallery 18 is provided on the bottom surface of the box 2 along the rotation support portion 5.

  The door body 1 has the same configuration as that described with reference to FIG. 11, a skin plate is provided over the entire lower surface, and an airtight buoyancy chamber 6 is formed at the tip.

  A pressure accumulation tank 19 is provided as an air storage container inside the base portion of the door body 1, and compressed air is enclosed in the pressure accumulation tank 19, and the filled air pressure is applied to the buoyancy chamber 6. It is sufficiently larger than the water pressure, and the amount of air is sufficient to fill the accumulator tank 19.

  An air pipe 8 connecting the buoyancy chamber 6 and the pressure accumulating tank 19 is provided along the upper surface, and the tip of the air pipe 8 is open to the inside of the buoyancy chamber 6. Further, a water pipe 9 is provided at the lowest position of the buoyancy chamber 6 and along the lower surface of the door body 1, and the tip of the water pipe 9 opens near the lowest position of the buoyancy chamber 6. The base end is opened in water through the side plate of the door body 1 or the skin plate.

  The air pipe 8 is provided with a first air valve 21, and a discharge pipe (not shown) communicates with the uppermost position of the buoyancy chamber 6 and in the vicinity thereof, and a second air valve that is a release valve connected to the discharge pipe. 22 is provided. The water pipe 9 is provided with a first liquid valve 23. The first air valve 21, the second air valve 22, and the first liquid valve 23 are a remotely operable electromagnetic valve, an electric valve, an air operated valve, and the like.

  As a method for enclosing compressed air in the accumulator tank 19, a compression pump is provided in the inspection gallery 18, the compression pump and the accumulator tank 19 are connected, and compressed air is enclosed in the accumulator tank 19. Also good. When the compressed air is sealed in the pressure accumulating tank 19, it may take a long time in a steady state, so the capacity of the compression pump may be small.

  In addition, as another method for filling the pressure accumulating tank 19 with compressed air, a compressor of a barge may be used. For example, a compressor of a trolley is connected to the accumulator tank 19 and compressed air is sealed in the accumulator tank 19.

  The operation of the flap gate will be described with reference to FIGS.

  FIG. 1 shows a standby state in which the buoyancy chamber 6 is filled with water, and the accumulator tank 19 is filled with compressed air. The first air valve 21, the second air valve 22, and the first liquid valve 23 are closed. Although the buoyancy due to the air of the pressure accumulating tank 19 acts on the door body 1, since the buoyancy center is in the vicinity of the hinge pin, the moment to stand is smaller than the moment to fall on the door body due to its own weight. , Never surface.

  When the door 1 is floated, the first air valve 21 and the first liquid valve 23 are opened with the second air valve 22 closed.

  The air in the pressure accumulating tank 19 flows into the buoyancy chamber 6 through the air pipe 8. The water in the buoyancy chamber 6 flows out into the water through the water pipe 9 and the first liquid valve 23. The buoyancy chamber 6 is replaced with air from water, and buoyancy is generated. Eventually, the buoyancy standing moment becomes larger than the falling moment of the door body's own weight, and the buoyancy chamber 6 rotates in the standing direction (see FIG. 2).

  When the buoyancy chamber 6 is completely replaced with air, the door 1 stands up so that the tip of the door 1 is exposed from the water surface (see FIG. 3). In addition, when the water level is low, it is not a complete standing state, but as shown in FIG. 4, when the water level rises, it rises following the rising water level to prevent overflow. When the door body 1 is fully upright, the upper surface of the door body 1 abuts against the flange portion 10 and the base end of the door body 1 abuts against the wall surface of the door bottom housing recess 4 opposite to the flange portion 10. In contact therewith, the door 1 is supported by the rotational force when water pressure from outside the bay acts (see FIG. 4).

  Next, referring to FIG. 5, a case where the flap gate is closed and the door body 1 is laid down (sinked) will be described.

  With the first air valve 21 closed, the second air valve 22 and the first liquid valve 23 are opened. Air in the buoyancy chamber 6 is released through the second air valve 22, and at the same time, water flows from the water into the buoyancy chamber 6 through the first liquid valve 23 and the water pipe 9. Buoyancy decreases and the door body 1 sinks.

  When the air in the buoyancy chamber 6 is completely released, the buoyancy chamber 6 is filled with water, and the door 1 is completely laid down. The first liquid valve 23 is closed, and compressed air is sealed in the pressure accumulating tank 19 to complete the standby state.

  In the present invention, since the pressure accumulating tank 19 is provided at the base of the door body 1, it is not necessary to form the air / water storage chamber 7 in the box body 2, the box body 2 is downsized, and construction is easy. Become. Further, the installation of the air pipe 8 and the water pipe 9 between the buoyancy chamber 6 and the pressure accumulating tank 19 may be performed only inside the door body 1, the structure is simplified, and the workability is improved.

  A second embodiment of the present invention will be described with reference to FIGS.

  First, the configuration of the flap gate according to the second embodiment will be described with reference to FIG. 6 to 10, the same components as those shown in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the second embodiment, the pressure accumulation tank 19 is omitted, and an air chamber 25 that functions as an air storage container is formed in the base of the door body 1. The volume of the air chamber 25 is set to be at least the same as the volume of the buoyancy chamber 6 or preferably sufficiently larger than the volume of the buoyancy chamber 6. Although the buoyancy due to the air in the air chamber 25 works, since the buoyancy center is in the vicinity of the hinge pin, the moment to rise is smaller than the moment to fall over due to the weight of the door body. Absent.

  The air chamber 25 and the buoyancy chamber 6 are connected by an air pipe 8, and a first air valve 21 is provided in the air pipe 8. The position at which the base end of the air pipe 8 opens into the air chamber 25 is at the top or near the top of the air chamber 25, and the tip of the air pipe 8 opens into the buoyancy chamber 6. The position is the top of the buoyancy chamber 6 or the vicinity of the top.

  The air chamber 25 and the buoyancy chamber 6 are connected by a water pipe 9, and the position where the base end of the water pipe 9 opens into the air chamber 25 is the lowest position of the wall portion on the front end side of the air chamber 25. The position where the tip of the water pipe 9 opens to the buoyancy chamber 6 is the lowest position or the lowest vicinity of the buoyancy chamber 6.

  The water pipe 9 is provided with a branch pipe 26 that branches and opens into the water. The water pipe 9 is provided with a first liquid valve 23 and the branch pipe 26 is provided with a second liquid valve 27. Further, a drain valve 28 is provided at the lowest position of the air chamber 25. The drain valve 28 is closed except when the air chamber 25 is filled with air. The opening position of the branch pipe 26 is the side surface of the door body 1 or a skin plate.

  The operation of the flap gate according to the second embodiment will be described with reference to FIGS.

  FIG. 6 shows a standby state in which the buoyancy chamber 6 is filled with water and the air chamber 25 is filled with air. The first air valve 21, the second air valve 22, the first liquid valve 23, and the second liquid valve 27 are closed.

  When the door body 1 is lifted, the first air valve 21 and the first liquid valve 23 are opened with the second air valve 22 and the second liquid valve 27 closed.

  The air in the air chamber 25 flows into the buoyancy chamber 6 through the air pipe 8. The water in the buoyancy chamber 6 flows into the air chamber 25 through the water pipe 9 and the first liquid valve 23. The buoyancy chamber 6 is replaced with air from water, and buoyancy is generated. Eventually, the buoyancy rising moment becomes larger than the falling moment of the door body's own weight, and the buoyancy chamber 6 rotates in the standing direction of the door body 1. As the door body 1 rotates, the buoyancy chamber 6 is positioned above the air chamber 25, and the inflow of air into the buoyancy chamber 6 and the discharge of water are performed rapidly. Further, the water in the buoyancy chamber 6 accumulates in the air chamber 25, so that the standing state of the door body 1 is stabilized.

  Moreover, it is the same as that of 1st Embodiment that the standing state of this door body 1 follows a water level (refer FIG. 9).

  Next, referring to FIG. 10, the case where the flap gate is closed and the door 1 is laid down will be described.

  The second air valve 22 and the second liquid valve 27 are opened while the first air valve 21 and the first liquid valve 23 are closed. Since the water level outside the port is located above the lowest position of the buoyancy chamber 6, water flows from the water into the buoyancy chamber 6 through the second liquid valve 27 and the water pipe 9, and at the same time, the buoyancy The air in the chamber 6 is released through the second air valve 22, the buoyancy is reduced, and the door body 1 sinks.

  When the air in the buoyancy chamber 6 is completely released, the buoyancy chamber 6 is filled with water, and the door 1 is completely laid down.

  When the air chamber 25 is filled with air, the first air valve 21 and the first liquid valve 23 are closed, the drain valve 28 is opened, and air is supplied from the inspection gallery 18 to the air chamber 25. Supply. When the air chamber 25 is completely drained and the drain valve 28 is closed, the standby state is completed.

  Note that a compression pump of a carriage may be connected to the air chamber 25, air may be pumped into the air chamber 25, and water in the air chamber 25 may be discharged from the drain valve 28 by air pressure.

  In the second embodiment, since compressed air is not sealed in the air chamber 25, the air chamber 25 does not need to have a pressure-resistant structure, and the structure is simplified.

  In the above embodiment, the buoyancy chamber 6 is provided at the tip, but the position to be provided is not limited to the tip of the door 1, and may be an intermediate portion of the door 1. When the buoyancy chamber 6 is provided on the base end side, the standing angle is increased even at a low water level, and the effect of suppressing the inflow of water is increased.

It is sectional drawing of the flap gate which concerns on the 1st Embodiment of this invention. It is operation | movement explanatory drawing which shows the water surface floating process of this 1st Embodiment. It is operation | movement explanatory drawing which shows the water surface floating state of this 1st Embodiment. It is operation | movement explanatory drawing which shows the standing state of this 1st Embodiment. It is operation | movement explanatory drawing which shows the sedimentation process of this 1st Embodiment. (A) is sectional drawing of the flap gate which concerns on the 2nd Embodiment of this invention, (B) is A arrow directional view of FIG. 6 (A). It is operation | movement explanatory drawing which shows the water surface floating process of this 2nd Embodiment. It is operation | movement explanatory drawing which shows the water surface floating state of this 2nd Embodiment. It is operation | movement explanatory drawing which shows the standing state of this 2nd Embodiment. It is operation | movement explanatory drawing which shows the sedimentation process of this 2nd Embodiment. It is sectional drawing of the conventional flap gate. It is operation | movement explanatory drawing which shows the water surface floating state of this flap gate. It is operation | movement explanatory drawing which shows the standing state of this flap gate. It is operation | movement explanatory drawing which shows the sedimentation process of this flap gate.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Door body 2 Box 5 Rotation support part 6 Buoyancy chamber 8 Air piping 9 Water piping 19 Accumulation tank 21 1st air valve 22 2nd air valve 23 1st liquid valve 25 Air chamber 26 Branch pipe 27 2nd liquid valve 28 Waste water valve

Claims (5)

  A door body is rotatably supported on the bottom of the water, a buoyancy chamber is provided on the distal end side from the rotation center of the door body, an air storage container is provided on a proximal end side from the buoyancy chamber, and the air storage container and the buoyancy chamber are provided. An air pipe having an open / close valve is connected, and the buoyancy chamber is filled with water and the door body is in a lying state, and the open / close valve is opened to communicate the buoyancy chamber with the air storage container. A flap gate characterized in that air flows into a buoyancy chamber from a container, the buoyancy chamber is replaced with air, and the door body is erected.   2. The flap according to claim 1, wherein the door body has a hollow structure at least at a distal end portion, the buoyancy chamber is formed at the distal end portion, and the air storage container is a pressure accumulation tank provided at a base portion of the door body. Gate.   The flap gate according to claim 1, wherein the door body has a hollow structure at least at a distal end portion and a proximal end portion, the buoyancy chamber is formed at the distal end portion, and the air storage container is formed by the proximal end portion.   The flap gate according to claim 1, wherein at least an intermediate part of the door body has a hollow structure, and the buoyancy chamber is formed in the intermediate part.   The buoyancy chamber is provided with a release valve, through which the air in the buoyancy chamber can be discharged, and the buoyancy chamber can be refilled with water. Or one flap gate.

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