JP5476209B2 - Floating flap gate - Google Patents

Description

  The present invention relates to a floating flap gate installed on the seabed of a harbor as a countermeasure for storm surges, for example.

  As a means of supplying air to the door body of a floating flap gate that raises and lowers the door body by buoyancy, there is an air pipe that extends from a water storage tank installed near the rotation support position of the door body to the inside of the door body. (For example, patent document 1).

  In such a floating flap gate, when a storm surge occurs, the air in the water storage tank is supplied into the door body through the air pipe, so that the buoyancy generated in the door body gradually increases and rises.

  However, when air is supplied to the door body through the air pipe, it is necessary to perform maintenance management so that dust is not clogged in the air pipe. However, maintenance management of the air pipe inside the door body is complicated and easy. Can not do.

  Further, in the case of the air supply means, a door is provided by providing a swivel joint (not shown) in the rotation support portion of the door body or by interposing a flexible hose in the vicinity of the rotation support portion of the door body (see FIG. 6). The inside and outside of the body are connected, but maintenance of these is also necessary. In FIG. 6, 1 is a door body, 2 is an air pipe, and 3 is a flexible hose.

  In addition, when a flexible hose is employed, the life of the flexible hose is short, so the frequency of maintenance work increases.

JP 2003-201710 A

  The problem to be solved by the present invention is that the maintenance and management of the air pipe in the door body is complicated in the floating flap gate that supplies air by providing the air pipe in the door body. In addition, when a swivel joint is provided in the rotation support part of the door body, or when the inside and outside of the door body are connected by interposing a flexible hose in the vicinity of the rotation support part of the door body, it is necessary to maintain and manage these. When a short flexible hose is employed, the frequency of maintenance work increases.

The floating flap gate of the present invention is
In order to solve the problem of supplying air by installing an air pipe in the door body,
A floating flap gate that erects the door body by supplying air to the door body that is installed to swing up and down on the distal end side with the rotation shaft on the base end side as a fulcrum,
In the door body,
A buoyancy chamber provided with an opening on the lower side when in the standing state on the lower surface side when in the lying state, is formed on the top side,
An air guide groove communicating with the opening is provided at a position below the opening in the standing state on the lower surface side in the lying state,
The most important feature is that the air supply pipe is installed so that the discharge port is positioned vertically below the air guide groove when the door body is in a lying state.

  In the present invention, since the air pipe is not provided in the door body, clogging of the air pipe and complicated maintenance work for the air pipe in the door body are not required. Further, since there is no movable part in the air supply pipe, maintenance management of the swivel joint provided in the movable part and the flexible hose is also unnecessary.

  In the present invention, when the air supply pipe is provided so that the discharge port faces vertically downward, it is possible to prevent dust and the like from flowing into the air supply pipe together with seawater.

  In the present invention, there is no air pipe in the door body, and there is no movable part in the air supply pipe, so that maintenance management is easy. In addition, since the air guide groove communicating with the opening of the buoyancy chamber is provided at the lower position when the door body is in the standing state, air can be supplied to the buoyancy chamber regardless of the standing angle of the door body, Air can be replenished even after the ascent starts.

(A) is the schematic explaining the standing state at the time of wave pushing of the floating-type flap gate of this invention, (b) is the schematic explaining the standing state at the time of wave drawing similarly, (c) is the same at the time of storing FIG. (A) is the figure which looked at the door body block which comprises the door body of the floating type flap gate of this invention from the lower surface side, (b) is the figure seen similarly from the side surface side. It is a figure explaining the relationship between the floating moment of the floating body type flap gate of this invention, and a lodging moment. It is a figure explaining the air supply state of the floating type flap gate of this invention, (a) is the figure at the time of the air supply at the time of landing when the door body is in a lying state, (b) is at the time of air supply while the door body is standing FIG. It is a figure explaining the desirable installation aspect of the discharge port of the air supply piping of the floating type flap gate of this invention. It is a figure explaining the conventional floating body type flap gate at the time of interposing a flexible hose in the rotation support part vicinity of a door body.

  In the present invention, for the purpose of solving the problem caused by the air pipe provided in the door body, an air guide groove communicating with the opening of the buoyancy chamber is provided at a lower position of the door body in an upright state so that the door body falls down. This is realized by installing an air supply pipe so that the discharge port is positioned vertically below the air guide groove in the state.

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to FIGS.
FIG. 1 is a diagram for explaining a floating flap gate according to the present invention. FIG. 1 (a) is an explanatory diagram of a standing state at the time of pushing wave, FIG. 1 (b) is an explanatory diagram of a standing state at the time of wave drawing, and FIG. It is explanatory drawing at the time of storage. 2A and 2B are diagrams for explaining a door body block constituting the door body. FIG. 2A is a view of the door body block as viewed from the lower surface side, and FIG. 2B is a view of the door body block as viewed from the side surface side.

  In FIG. 1, reference numeral 11 denotes a floating flap gate of the present invention installed in a harbor, for example, a door body 12 whose top side undulates and swings with a rotating shaft 12a on the base end side as a fulcrum, and an operation of raising the door body 12 An air supply unit (not shown) for supplying air to the door body 12 is provided.

  The door body 12 includes a plurality of sets of door body blocks B arranged in the width direction, and connects adjacent door body blocks B with a rope. As shown in FIG. 2, in the door block B, intermediate stringers B2 are arranged in parallel at predetermined intervals between the end stringers B1 arranged at both ends in the width direction, and these are in the stored state. The plate B3 is attached to the upper surfaces of the end stringer B1 and the intermediate stringer B2.

When the door 12 is stored, the distance from the tip mooring portion 12d to the position where the buoyancy F is generated is L1, the distance from the rotary shaft 12a to the position where the gravity G is applied is L3, and the position where the buoyancy F is generated to the position where the gravity G is applied Is L2 (see FIG. 3), the levitation moment MF and self-weight moment MG with the tip anchoring portion 12d and the rotating shaft 12a as fulcrums, and the reaction forces R _A and R _B of the tip anchoring portion 12d and the rotating shaft 12a are It can be calculated as follows.

If the vertical downward reaction force is + and the clockwise moment is +,
・ Moment with rotating shaft 12a as fulcrum B Levitation moment: MF _B = F × (L2 + L3)
Self-weight moment: MG _B = G × L3

・ Moment with tip mooring part 12d as fulcrum A Levitation moment: MF _A = F × L1
Self-weight moment: MG _A = G × (L1 + L2)

-Reaction force of the tip mooring part 12d: R _A = (MF _B + MG _B ) / (L 1 + L 2 + L 3)
-Reaction force of rotating shaft 12a: R _B = F _B + G _B -R _A

When considering the moment with the rotating shaft 12a as the fulcrum B, the door body 12 is lifted if MF _B + MG _B <0. When considering the moment with the tip mooring part 12d as the fulcrum A, if MF _A + MG _A > 0, no upward force acts on the rotating shaft 12a. Further, the reaction force R _A tip anchoring portion 12d is -, upward force is applied to the distal anchoring portion 12d, when the reaction force R _B of the rotary shaft 12a is +, downward force to the rotary shaft 12a of action To do.

However, if such an upward force on the rotary shaft 12a does not occur, i.e. if as a reaction force R _B of the rotary shaft 12a is +, it may not support the entire circumference of the rotary shaft 12a, The structure of the support portion is simplified and can be small.

Therefore, regardless of the amount of air in the buoyancy chamber 12b, to upward force to the rotation shaft 12a is prevented from action it is necessary to ensure that the reaction force R _B of the rotating shaft 12a has a positive, For this purpose, the distance L2 is required to some extent. That is, it is not desirable that the entire door body 12 be the buoyancy chamber 12b.

  Therefore, in the present invention, even when the buoyancy chamber 12b is filled with air, the vertical girder on the top side (the tip mooring portion side) of the door body 12 is prevented so that upward force does not act on the rotary shaft 12a. A buoyancy chamber 12b is provided in each (between one and the other end stringers B1 and intermediate stringers B2). This buoyancy chamber 12b is provided with an opening 12ba on the lower surface side when it is in the stowed stowed (landing) state shown in FIG. 1 (c) and on the lower side when it is in the standing state shown in FIG. 1 (a). It communicates with the outside (see FIG. 2).

  In addition, in the present invention, the lower side of the door body 12 in the retracted state, a position below the opening 12ba in the standing state, that is, between the vicinity of the rotating shaft 12a and the opening 12ba. In addition, an air guide groove 12c is provided on the lower surface side of the intermediate string B2 in the retracted state.

  By installing the air guide groove 12c at the position, the door body 12 is rotated with little change in the position of the door body 12 at any position from the retracted state of FIG. 1C to the lifted state of FIG. 1B. A discharge port 13a of the air supply pipe 13 can be installed in the vicinity of the shaft 12a. The air supply pipe 13 is installed so that the discharge port 13a is positioned vertically below the lower opening 12ca of the air guide groove 12c in the retracted state. Further, an upper opening 12cb is provided on the upper side of the air guide groove 12c in the standing state, and communicates with the buoyancy chamber 12b.

  Therefore, regardless of whether the door 12 is in the retracted position, the lift completion position, or any position between the storage position and the lift completion position, as shown in FIG. The 12 buoyancy chambers 12b can be supplied with air.

  At that time, as shown in FIG. 5, if the discharge port 13a is directed vertically downward, it is possible to prevent dust and the like from flowing into the air supply pipe 13 together with seawater. Note that the vertical installation position of the air supply pipe 13 is preferably set such that the angle θ formed by the center of the discharge port 13a and the front end surface of one side wall of the air guide groove 12c is 5 ° or more. . This is because when the angle θ is smaller than 5 °, the ratio of the air discharged from the discharge port 13a to be scattered outside the air guide groove 12c increases.

  By the way, for example, when a diver enters the lower side of the door body 12 and performs maintenance and inspection, it is assumed that air accompanying breathing accumulates on the rotating shaft 12a side of the door body 12. In this case, in order not to apply an upward force to the rotating shaft 12a of the door body 12, even if the buoyancy chamber 12b is provided on the top side (the tip mooring portion side) of the door body 12, the rotating shaft 12a of the door body 12 is provided. There is a possibility of air accumulation in the vicinity.

  Accordingly, in order to prevent the occurrence of such air accumulation, the air is released so that the air accumulated in the base end side (rotary shaft 12a side) of the door body 12 does not generate air accumulation and escapes. It is desirable to provide

  In addition, 14 in FIG. 1 is a tension rod provided outside the harbor so that the door body 12 does not fall when the door body 12 stands, and 15 is a door body 12 that is in a floating state at the time of pulling up to a predetermined angle. This is a stopper device that supports the door body 12 when it falls down. Reference numeral 16 denotes a mooring device for mooring the door body 12 during storage.

  The floating-type flap gate 11 of the present invention having the above-described configuration has the air guide groove 12c from the discharge port 13a of the air supply pipe 13 through the lower opening 12ca of the air guide groove 12c in the retracted state shown in FIG. To the buoyancy chamber 12b from the air guide groove 12c through the upper opening portion 12cb of the air guide groove. In this air supply, the floating flap gate 11 of the present invention can supply air to the buoyancy chamber 12b regardless of the rising angle of the door body 12, so that air can be supplied even after the start of ascent.

  When standing up is completed, as shown in FIGS. 1A and 1B, the standing state is maintained at a position where the tip of the door body 12 slightly protrudes from the water surface. In this state, when a tsunami or storm surge occurs, the door body rises to an upright state shown in FIG. 1A due to a push wave (difference in water level between the outside of the port and the inside of the port). When the tsunami and storm surges are settled, the water level outside the port decreases and the water level difference from the inside of the port disappears, so the position returns to the position shown in FIG.

  For example, if the exhaust valve (not shown) installed in the buoyancy chamber 12b of the door body 12 is opened, the air in the buoyancy chamber 12b is exhausted due to the pressure difference caused by the water pressure, and the opening operation from the standing state is performed. Further, water enters the buoyancy chamber 12b, and the door body 12 loses buoyancy and falls down.

  The present invention is not limited to the examples described with reference to FIGS. 1 to 5. Needless to say, the embodiments may be changed as appropriate within the scope of the technical idea described in each claim.

  For example, the structure of the mooring device 16 installed in the floating flap gate 11 of the present invention is not particularly limited. Further, the tension rod 14 and the stopper device 15 are not necessarily installed.

  The present invention can be installed not only in a harbor but also in a river. It can also be installed near a mooring place.

DESCRIPTION OF SYMBOLS 11 Floating body type flap gate 12 Door body 12a Rotating shaft 12b Buoyancy chamber 12ba Opening 12c Air guide groove 13 Air supply piping 13a Discharge port

Claims (2)

A floating flap gate that erects the door body by supplying air to the door body that is installed to swing up and down on the distal end side with the rotation shaft on the base end side as a fulcrum,
In the door body,
A buoyancy chamber provided with an opening on the lower side when in the standing state on the lower surface side when in the lying state, is formed on the top side,
An air guide groove communicating with the opening is provided at a position below the opening in the standing state on the lower surface side in the lying state,
A floating flap gate, characterized in that an air supply pipe is installed so that a discharge port is positioned vertically below the air guide groove when the door body is in a lying state.   The floating flap gate according to claim 1, wherein the air supply pipe is provided with a discharge port directed vertically downward.

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