JP2011202474A - Floating body connection type flap gate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a floating body connection type flap gate which can prevent the shaking of the door body from becoming large when it is erected and which can prevent the door body block on the tip side from bending inside when it is laid low.SOLUTION: The floating body type flap gate 1 blocks the opening when water w flows in. The door body blocks 2a to 2c which constitute the door body 2 and which are divided in the height direction are connected to each other so that they can freely rotate within the plane in the height direction. The parts of the adjacent door body blocks 2a, 2b and 2b, 2c which are positioned lower than the rotation sections 3a, 3b when laid low are connected to each other by first cylinders 4a, 4b, and the part of the door body block 2c on the base end side which is positioned lower when laid low and the concave surface s1 are connected to each other by a second cylinder 4c. All of the cylinders 4a to 4c are connected to each other by piping 5 so that a fluid can move freely between the first and the second cylinders 4a to 4c. The door body does not shake on a large scale regardless of the water level of the water flowing in from the opening. Furthermore, when the door body is laid low, the door body block on the tip side bends inward, and does not prevent the door body from being laid low.

Description

  The present invention relates to a floating body-connected flap gate that is installed, for example, in an opening portion of a tide wall and raises a door body to block the opening portion so that the increased water does not flow into public space when the water volume increases. In particular, when falling from an upright state, the top door block (hereinafter referred to as the front-end door block) is bent in the falling direction (hereinafter referred to as the inner side) and hinders lodging. It is to prevent becoming.

  In order to prevent the increased water from flowing into the public space at the time of water increase, a floating flap gate that blocks the opening may be installed at the opening of the tide wall (for example, Patent Documents 1 and 2).

  This type of floating-type flap gate has a single large floating body in the door body, and uses the water pressure flowing from the opening of the tide wall and the buoyancy of the door body itself to stand up and open the door body. The part is cut off.

  However, the door body of the conventional floating flap gate is integrally formed in the height direction. Therefore, as shown in FIG. 11, the door body as a whole stands up at a time when the water level reaches a certain height, so that there is a problem that the door body is greatly shaken and has a high risk. In addition, d in FIG. 11 is the opening part of a tide wall, G is the door body of the floating-type flap gate installed in the opening part, and w is water.

  In addition, at the initial stage of the inflow of water into the opening, the door body does not stand up following the inflow of water, and stands up behind the inflow of water, so that water enters from the opening until it stands up. There is also a problem.

  Furthermore, when water with a large fluid force (rapid flow or rapid flow) flows in when the door is standing, there is a problem that a large impact force is generated in the door when the standing is completed, and the door is damaged.

JP 2001-214425 A JP 2003-253912 A

  The problem to be solved by the present invention is that the conventional floating-type flap gate has a large risk of shaking the door body because the whole door body stands up at once when the water level reaches a certain height. Is a point. Moreover, since the door body stands up with a delay from the inflow of water at the initial stage of inflow of water into the opening, water leakage occurs. Furthermore, when water with a large fluid force flows while standing, the door body is damaged.

Floating body connected flap gate of the present invention,
To prevent the door body from shaking when standing up, and the door block on the tip side to bend inward when falling from the standing state,
A floating flap gate that is installed on the road surface of the opening and blocks the opening when water flows in from the opening,
A door body is composed of a plurality of door body blocks divided in the height direction,
These door blocks are connected so that they can rotate freely in a plane in the height direction,
The portions of the adjacent door block located below the rotating portion when lying down are the first cylinder, which is the lowermost door block (hereinafter referred to as the base-end door block). The main part is that all the cylinders are connected with piping so that the fluid can move between the first and second cylinders by connecting the part located below and the road surface with the second cylinder. It is a feature.

  In the present invention, the door block rises stepwise from the base door block according to the water level of the inflowing water, so even when a rapid or turbulent flow with a large fluid force flows, A large impact force is generated on the door body and the door body is not damaged.

  In addition, fluid in all cylinders that connect between adjacent door block and the door block on the base end side and the road surface can flow freely between each cylinder, so when falling from an upright state In addition, the door block on the tip side does not bend inward and prevent lodging.

  In the present invention, the first cylinder that connects adjacent door blocks is in an extended state, and the second cylinder that connects the base end side door block and the road surface is in a compressed state. When a third cylinder in an extended state containing a cylinder is added to the system connected by piping, the door block on the distal end side can also stand up.

  That is, by providing the third cylinder, a shortage of fluid can be supplied to the first cylinder that connects the front-end door block that is in a compressed state when standing. At that time, if a compression resistance is increased by installing a spring in the third cylinder, when the door block other than the front end door block is erected, the first cylinder and the second cylinder are connected. Fluid supply to the cylinder can be prevented.

  The cylinder capacity of the first cylinder connecting the door block on the front end side is increased, and a fourth cylinder capable of supplying the increased volume of fluid is added to the system in addition to the third cylinder. In this case, the follow-up performance of the standing operation with respect to the rising water level is improved.

  That is, when the inflowing water level rises, the fluid required for the extension operation of the first cylinder connecting the front door block can be supplied in advance from the fourth cylinder, so that the front door block Stands up ahead of the inflow of water. Therefore, the water that flows into the lower side of the door block in the fallen state is guided and the water pressure is applied to the slope on the lower side of the door block on the tip side, so that the door body floats at the initial stage of the water flow into the opening. Becomes faster and the followability is improved.

  In the present invention, the surface rises while rotating stepwise from the door block on the base end side according to the water level of the inflowing water. A large impact force is not generated and the door body is not damaged. In this case, since a power device such as a pump is not necessary, the device can be simplified, and the maintenance burden can be reduced.

  Further, when the door body falls from the standing state, it is possible to prevent the door body block on the distal end side from being bent inward and obstructing the lodging.

It is the figure which looked at the floating body connection type flap gate of 1st this invention from the side, (a) is a figure of a lying state, (b) is the figure which showed the state in which the door body block of the base end side stood up, (c) ) Is a view showing a state in which the base end side and the intermediate door block are erected. It is a figure explaining a 1st rotation part, (a) is an enlarged view, (b) is a figure when it rotates only a predetermined angle to the direction of the water which flows in from an opening part. It is a figure explaining the 2nd rotation part, (a) is the enlarged view which looked at the state before connection from the side, (b) is the side view of (a), (c) is the direction of the water which flows in from an opening part It is a figure when it rotates only a predetermined angle. It is a figure explaining the 3rd rotation part, (a) is the figure which looked at the state before connection from the side, and is the figure which showed the lying state in (b). It is a figure explaining the point which can be improved by 1st this invention. It is the figure which looked at the floating body connection type flap gate of the 2nd present invention from the side, (a) is a figure of a lying state, (b) is a figure showing the state where the base end side and the middle door body block stood up, (C) is the figure which showed the state in which all the door body blocks stood up. It is the figure which looked at the floating body connection type | mold flap gate of 3rd this invention from the side surface, (a) is the figure which showed the lying state, (b) is the figure which the front side door body block floated ahead. It is a figure explaining the 5th cylinder used for the floating body connection type flap gate of the 4th present invention. It is the figure which looked at the floating body connection type flap gate of 4th this invention from the side, (a) is the figure which showed the lying state, (b) is the figure which the front-end side door body block floated ahead, (c) ) Is a diagram showing a state in which all door blocks are upright. (A)-(c) is a figure explaining the other example of the floating body connection type flap gate of this invention. (A)-(e) is a figure explaining the standing state of the conventional floating body type flap gate later on.

  In the present invention, a plurality of door blocks divided in the height direction are connected so as to be freely rotatable in a plane in the height direction in order to prevent the swing of the door body from becoming large when standing. It was realized.

  In addition, when falling from an upright state, the door block on the front end side is bent inward so that it does not hinder the lodging, and the adjacent door block and the door block on the base side and the road surface This is realized by connecting the first and second cylinders connecting the two by piping.

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to FIGS.
1 to 5 are explanatory diagrams of a floating body-coupled flap gate according to the first aspect of the present invention, FIG. 6 is an explanatory view of a floating body-coupled flap gate according to the second aspect of the present invention, and FIG. 7 is a floating body coupling of the third aspect of the present invention. FIG. 8 and FIG. 9 are explanatory views of a floating body connected flap gate according to the fourth aspect of the present invention.

(First Invention Example: FIGS. 1 to 5)
Reference numeral 1 denotes, for example, a floating-body-connected flap gate of the present invention installed on the road surface s of the opening portion of the tide wall. When the water w is about to flow into the public space (road surface) from the opening (left direction in FIG. 1), the floating body connected flap gate 1 is configured to reduce the water pressure of the flowing water w and the buoyancy of the door body 2. The door body 2 is erected by using the base end side as a fulcrum to block the opening.

  There are two types of installation modes of the floating body-connected flap gate 1 on the road surface s of the opening of the tide barrier wall, the embedded type shown in FIG. 1 and the mounting type not shown in the figure. May be.

  The road surface embedding type forms a concave surface s1 (embedded pit) on the road surface s of the opening constructed at a position lower than the road surface, and accommodates the floating body-connected flap gate 1 (in a collapsed state) in the concave surface s1. . In this road surface embedding type, a drainage channel for discharging water from the concave surface s1 to the ocean side (river side) is provided.

  On the other hand, the road surface mounting type mounts the floating body connected flap gate 1 (in a lying state) on the road surface of the opening constructed at the same position as the road surface.

  In this invention, it is the structure which divided | segmented the door body 2 which comprises this floating body connection type flap gate 1 into three door body blocks 2a-2c which are the hollow structures made from steel, for example in the height direction. Hereinafter, these three door body blocks 2a to 2c are referred to as a distal end side door body block 2a, an intermediate door body block 2b, and a proximal end side door body block 2c from the upper side in the standing state.

  And between these door body blocks 2a-2c and the door body block 2c and the road surface s on the base end side are directed in the direction of water w to flow from the opening in a plane in the height direction. For example, they are connected by rotating parts 3a to 3c that can freely rotate at a predetermined angle.

  Hereinafter, the rotating part connecting the front door block 2a and the intermediate door block 2b is the first rotating part 3a, and the rotating part connecting the intermediate door block 2b and the base door block 2c is the rotating part. This is called the second rotating unit 3b. Moreover, the rotation part which connects the door body block 2c of the base end side and the road surface s is called the 3rd rotation part 3c.

These rotation parts 3a-3c are comprised, for example with the following structures.
For example, the first rotating portion 3a is provided with, for example, two arcuate guide holes 3aa and 3ab at different radial positions in the adjacent end portion of the intermediate door body block 2b and the door body block 2a on the front end side. On the other hand, a pin 3ac that moves while being guided by the guide holes 3aa and 3ab at the same radial position as the arcuate guide holes 3aa and 3ab at the end adjacent to the intermediate door body block 2b of the door block 2a on the front end side. , 3ad are provided.

  Similarly, the second rotating portion 3b is provided with two arcuate guide holes 3ba and 3bb at different radial positions in the adjacent end portion of the door body block 2c on the base end side with respect to the intermediate door body block 2b. . On the other hand, a pin 3bc that moves while being guided by the guide holes 3ba and 3bb at the same radial position as the guide holes 3ba and 3bb at the end adjacent to the door body block 2c on the base end side of the intermediate door body block 2b. 3bd is provided.

  The third rotating portion 3c is provided with two arcuate guide holes 3ca and 3cb at different radial positions on the road surface s adjacent to the base end side door block 2c. On the other hand, pins 3cc and 3cd that are guided and moved by the guide holes 3ca and 3cb are provided at the same radial positions as the guide holes 3ca and 3cb at the end adjacent to the road surface s of the door block 2c on the base end side. is there.

  In the case of such rotating parts 3a to 3c, the door blocks 2a and 2b, 2b and 2c, and the road surface s are centered on the center of the radius of the arcuate guide holes 3aa, 3ab, 3ba, 3bb, 3ca, 3cb. On the other hand, the door block 2c on the base end side rotates.

  At that time, by determining the arcuate lengths of the arcuate guide holes 3aa, 3ab, 3ba, 3bb, 3ca, 3cb optimally, the base ends of the door blocks 2a and 2b, 2b and 2c, and the road surface s The rotatable angle of the side door block 2c is determined.

  4a is the adjacent door body block 2a and the intermediate door body block 2b adjacent to each other, 4b is the intermediate door body block 2b and the base door side block 2c of the same, when lying more than the rotating parts 3a and 3b. It is the 1st cylinder which connects the parts located below. Reference numeral 4c denotes a second cylinder that connects a portion of the door block 2c on the base end side that is located below the rotating portion 3c when lying down and a concave surface s1 on which the floating body-connected flap gate 1 of the present invention is installed. It is.

  These first and second cylinders 4a, 4b, and 4c have a piston rod attached integrally with a piston that slides in the cylinder, and a single unit that allows fluid to enter and exit only on the side of the cylinder that does not contain the piston rod. This is a dynamic cylinder. In addition, although oil is used as the fluid entering and exiting the first and second cylinders 4a, 4b, and 4c, water may be used as long as it is an incompressible fluid.

  The first cylinder 4a connecting the front door block 2a and the intermediate door block 2b has a piston rod attached to the front door block 2a and a cylinder attached to the intermediate door block 2b. Yes.

  The first cylinder 4b connecting the intermediate door block 2b and the proximal door block 2c has a piston rod attached to the intermediate door block 2b and a cylinder attached to the proximal door block 2c. It has been.

  Further, in the second cylinder 4c that connects the door block 2c on the base end side and the concave surface s1, the piston rod is attached to the door block 2c on the base end side, and the cylinder is attached to the concave surface s1.

  These first and second cylinders 4a, 4b and 4c are connected by a pipe 5, and the fluid sealed on the side where the piston rods in the first and second cylinders 4a, 4b and 4c are not stored is It can move freely between the first and second cylinders 4a, 4b, 4c.

  The pipe 5 is provided between the front door block 2a and the intermediate door block 2b, between the intermediate door block 2b and the proximal door block 2c, the proximal door block 2c and the concave surface s1. Between and the connecting portion to each cylinder are connected by a flexible hose 5a having no elasticity.

  Hereinafter, in the first invention example, as described below, according to the water level at the time of water increase from the overlaid accommodation state shown in FIG. 1 (a), to FIG. 1 (b) and FIG. 1 (c). Stand up to the state shown.

(1-1) In a situation where a disaster such as a tsunami has not occurred, the floating body-connected flap gate 1 is accommodated in a concave surface s1 formed on the road surface s as shown in FIG. When the concave surface s1 is not formed, it is accommodated on the road surface s.

 (1-2) In the case of a tsunami, when water has increased in the overlaid accommodation state shown in FIG. 1 (a), buoyancy and water pressure are applied to the lying door body 2 by the increased water w. Due to the buoyancy and the water pressure, the door block 2c on the base end side starts to rise by turning upward in the direction opposite to the opening with the third rotating portion 3c as the center. At the same time, the fluid in the extended first cylinder 4b moves to the second cylinder 4c, and the second rotating portion 3b bends. Subsequently, the second cylinder 4c extends and the proximal-end door block 2c stands.

  In this state, as shown in FIG. 1 (b), the two door body blocks 2a and 2b except the door block 2c on the base end side are in a state of floating on the water surface, and the door body block 2a on the distal end side. And the side surface of the door block 2c on the base end side serve as a wall that prevents water from entering.

(1-3) When water further increases from the state shown in FIG. 1B, buoyancy and water pressure act on the lying door blocks 2a and 2b due to the increased water. Due to this buoyancy and water pressure, the intermediate door block 2b starts to rise by turning upward in the direction opposite to the opening with the second rotating portion 3b as the center. At the same time, the fluid in the extended first cylinder 4a moves to the first cylinder 4b, and the first rotating portion 3a starts to bend. Subsequently, the first cylinder 4b extends and the intermediate door block 2b stands up.

  In this state, as shown in FIG. 1 (c), only the first rotating portion 3a is bent, and the door block 2a on the distal end side floats on the water surface. The top surface of 2a and the side surfaces of the intermediate door body block 2b and the proximal end door body block 2c serve as walls that prevent water from entering.

  Next, a description will be given of a lying down operation when the floating body connected flap gate 1 of the present invention is laid down from the standing state shown in FIG. 1C to the road surface s of the opening shown in FIG.

(2-1) The situation shown in Fig. 1 (c) is the situation before the tsunami and other disasters were settled. In the case of this situation, the floating-body-coupled flap gate 1 is in a state where the intermediate door body block 2b and the base-end-side door body block 2c are erected.

(2-2) In the state where the intermediate door body block 2b and the base end side door body block 2c shown in FIG. 1C are erected, for example, when the water level falls, the intermediate door body block 2b and the base door block 2b in the erected state The water pressure acting on the end door block 2c is reduced. Due to the decrease in the water pressure, the intermediate door block 2b pivots downward toward the opening centering on the second rotating portion 3b and begins to fall down. At the same time, the fluid in the extended first cylinder 4b moves to the first cylinder 4a, and the second rotating portion 3b starts to bend. Subsequently, the first cylinder 4a extends and the intermediate door block 2b falls.

  In this state, as shown in FIG.1 (b), only the 2nd rotation part 3b is bent, and the door body block 2a of the front end side and the intermediate door body block 2b are in the state which floated on the water surface. .

(2-3) When the water level is further lowered from FIG. 1 (b), the water pressure acting on the standing base end side door block 2c further decreases, and the base end side door block 2c is third. The rotary part 3c is pivoted down toward the opening and starts to fall down. At the same time, the fluid in the extended second cylinder 4c moves to the first cylinder 4b, and the third rotating portion 3c starts to bend. Subsequently, the first cylinder 4b extends to cause the base body side door block 2c to fall, and as shown in FIG. 1A, all the door blocks 2a to 2c are accommodated in the concave surface s1. Complete.

  As described above, when the water w flows from the lying down state of FIG. 1 (a), the floating body-connected flap gate 1 of the present invention has a basic structure as shown in FIGS. 1 (b) and 1 (c). The door block 2c on the end side and the intermediate floating body block 2b rise in a stepwise manner and prevent water w from entering.

  At that time, the base end side door block 2c pulls the intermediate door block 2b by the fluid force applied to the base end side door block 2c before the base end side door block 2c is completely raised. Lift up from the surface in the same way. Accordingly, the standing speed of the door block 2c on the base end side is reduced immediately before the completion of standing up, and the impact force is softened, and the door body 2 is damaged even if water w having a large fluid force flows during standing up. Disappears.

  Further, since the fluid in all the cylinders 4a, 4b, 4c flows freely between the cylinders 4a, 4b, 4c, the door block 2a on the distal end side when falling down from the standing state is as shown in FIG. In addition, it does not interfere with lodging by bending inside.

(Second Invention Example: FIG. 6)
Reference numeral 6 denotes a third cylinder, which incorporates a spring 6a. As shown in FIG. 6A, the third cylinder 6 is installed in the system connected by the pipe 5 so as to be extended by the spring 6a when the door body 2 is lying down. When the door body 2 is lying down, the first cylinders 4a and 4b connecting the adjacent door body blocks 2a and 2b, 2b and 2c are in an extended state, and the base body side door body block 2c and the concave surface s1 are connected. The second cylinder 4c to be compressed is in a compressed state.

  By the way, in the case of the first invention example, when the fallen door body 2 stands, the first cylinder 4a that finally connects the intermediate door body block 2b and the front door block 2a is compressed. The door 2a on the distal end side cannot stand up (FIG. 1 (c)).

  However, in the case of the second example of the present invention, when the water level further rises from the state of FIG. 6 (b), the door block 2a on the distal end side is lifted and the first cylinder 4a is extended and the third cylinder 4a is extended. The fluid in the cylinder 6 is sent into the first cylinder 4a against the spring 6a, and the third cylinder 6 is compressed. Accordingly, the door block 2a on the distal end side can also stand up (FIG. 6C).

  On the other hand, when the door body 2 in the standing state falls, when the first cylinder 4a that connects the door block 2a on the distal end side is compressed during the fall, the spring 6a in the third cylinder 6 opens, The fluid in one cylinder 4a moves to the third cylinder 6 and the third cylinder 6 extends. Then, the first cylinder 4b connecting the intermediate door block 2b and the base end side door block 2c, and the second cylinder 4c connecting the base end side door block 2c and the concave surface s1 are sequentially compressed. .

(Third invention example: FIG. 7)
7 is a fourth cylinder, and as shown in FIG. 7, when the door body 2 is stowed, the system connected by the pipe 5 so that the fluid is supplied to the anti-piston rod side. Installed inside.

  In the case of this third invention example, the cylinder capacity of the first cylinder 4a is increased by the same capacity as the capacity of the fluid supplied to the anti-piston rod side in the fourth cylinder 7, and the door block 2a on the front end side is increased. Is rotated about 15 ° further to the standing side than the lying state shown in FIG.

  Accordingly, when the water w flows into the lower side of the door body 2 in the fallen state, the door body block 2a on the front end side starts to rise up earlier by the water pressure acting on the lower side of the door body 2, and the fourth cylinder 7 is supplied to the first cylinder 4a, and the front door block 2a is rotated about 15 ° to the upright side.

  By turning the door block 2a on the leading end side to the upright side, water pressure can be applied to the lower slope of the door block 2a on the leading end side, and the door body in the initial inflow of water w into the opening. The levitation movement of No. 2 becomes faster and the followability is improved.

  In addition, when the door block 2a on the front end side starts to stand up first, the fourth cylinder 7 without a built-in spring has no resistance at the time of compression. The spring 6a of the third cylinder 6 is not compressed.

(Fourth Invention Example: FIGS. 8 and 9)
FIG. 8 is a view for explaining a fifth cylinder 8 used in the fourth invention example. The fifth cylinder 8 gives the role of the third cylinder 6 and the role of the fourth cylinder 7 as one cylinder.

  That is, when the capacity of the third cylinder 6 is A and the capacity of the fourth cylinder is B, the fifth cylinder 8 has the capacity of the third cylinder A + B, and this increased capacity. The stroke movement for B is configured such that compression of the spring 8a is unnecessary.

  In the fourth example of the invention, when the water flows up and stands from the lying state shown in FIG. 9A, the piston of the fifth cylinder 8 does not compress the spring 8a until the end of the spring 8a. Retract and supply the fluid to the first cylinder 4a to stand up the door block 2a on the front end side in advance (FIG. 9B).

  When the water level rises and the base end side door body block 2c and the intermediate door body block 2b stand up and the front end side door body block 2a is lifted, the first cylinder 4a expands to The fluid in the cylinder 8 is sent into the first cylinder 4a against the spring 8a and compressed (FIG. 9C).

  The present invention is not limited to the above examples, and it goes without saying that the embodiments may be changed as appropriate within the scope of the technical idea described in each claim.

  For example, in the above-described example, the rotation unit capable of rotating at a predetermined angle is shown, but the rotation angle may be determined by the stroke end of the cylinder. In this case, the rotating part may be a rotatable part such as a pin and a bush, so that the structure becomes simple.

  Further, it is desirable that the intermediate door body block 2b excluding the distal end side door body block 2a and the proximal side door body block 2c are operated gently in order to reduce the impact force when the operation stops.

  Therefore, in order to adjust the speed at which the cylinders 2b and 2c connected to the intermediate door block 2b and the base door block 2c expand and contract, the connecting piping between the piping 5 and the cylinders 2b and 2c It is conceivable to increase the flow resistance by reducing the size (FIG. 10 (a)), making it tapered (FIG. 10 (b)), or providing a valve 9 (FIG. 10 (c)).

  In the above example, the door body 2 is formed by the three door body blocks 2a to 2c. However, the number of door body blocks forming the door body 2 is not limited to three, but two or four or more. There may be.

  The floating body-coupled flap gate of the present invention does not use a power unit, but can be applied to a floating body-coupled flap gate that is mechanically erected by press-fitting a fluid into the cylinder system from the outside.

DESCRIPTION OF SYMBOLS 1 Floating body connection type flap gate 2 Door body 2a-2c Door body block 3a-3c Rotating part 4a, 4b 1st cylinder 4c 2nd cylinder 5 Piping 6 3rd cylinder 7 4th cylinder 8 5th cylinder

Claims (4)

A floating flap gate that is installed on the road surface of the opening and blocks the opening when water flows in from the opening,
A door body is composed of a plurality of door body blocks divided in the height direction,
These door blocks are connected so that they can rotate freely in a plane in the height direction,
The portions of the adjacent door block located below the rotating portion when lying down are the first cylinders, and the portion of the door block located on the lowermost side when standing is placed below the road surface and the portion located below. A floating body connected flap gate characterized in that all cylinders are connected by piping so that fluid can freely move between the first and second cylinders.   When the door cylinder block is in a compressed state, the first cylinder connecting the adjacent door body blocks is in an extended state, and the door cylinder block that is the lowermost when standing up and the second cylinder connecting the base are in a compressed state 2. The floating body-connected flap gate according to claim 1, wherein an extended third cylinder having a spring built therein is added to the system connected by the pipe.   The cylinder capacity of the first cylinder that connects the uppermost door block at the time of standing is increased, and a fourth cylinder capable of supplying the increased volume of fluid is further added to the system. The floating body connection type flap gate according to claim 2.   The cylinder capacity of the first cylinder that connects the uppermost door block when standing up is increased, the capacity of the third cylinder is increased by this increased capacity, and the stroke movement by this increased capacity is 3. The floating body-connected flap gate according to claim 2, wherein compression of the spring is unnecessary.

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