JP2013068015A - Flap gate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily open a gate body even in the case where a foreign substance is mixed or drain water is a little, and to close the gate body even in the case where a water level of a river is stagnant or the water level rises slowly.SOLUTION: In a flap gate 1, a balancing member 3 to which a suspension member 7 is connected is integrally fixed on an outer surface on a side opposed to a drain hole 21 in a gate body 2, and specific weights of the gate body 2 and the balancing member 3 are made different from each other. When the specific weight of the balancing member 3 is defined as a, its cubic volume is defined as c, the specific weight of the gate body 2 is defined as b and its cubic volume is defined as d, the specific weights and the cubic volumes are determined in such a manner that a predetermined relation is established.

Description

  The present invention relates to a flap gate that prevents a backflow from a drainage hole at the time of river increase or high tide.

Conventionally, a flap gate has a structure that allows one side of a door to be suspended and swings only in one direction. When the water level in the internal water is high, the door is pushed open by water pressure and drained. It is known that the door body is blocked by water pressure at the time of water increase or at high tide.
However, in such a flap gate, it is possible to discharge the internal water, but when the accumulation of miscellaneous matter or driftwood etc. is mixed in the gap between the door body and the drain hole, the blockage becomes incomplete. As a result, there was a problem of backflow from the river to the inland water.

  On the other hand, the arm bent in the shape of a side face connecting the floating door body is provided so as to be able to swing around a fulcrum located on the downstream side, and the downstream water level reaches the predetermined water level inside the bank. Then, the buoyancy moment centered on the fulcrum becomes larger than the moment due to the total weight of the floating door body and arm, so that the buoyancy position is located in front of the fulcrum (opening edge side) and the floating door body is A lock gate / pipe gate (flap gate) is known (Patent Document 1).

JP 2001-164541 A

  However, in the flap gate of Patent Document 1, even when foreign matter is mixed in the gap between the door body and the opening edge, the door body is completely closed, but the floating door body is open. When it is installed, or when the water level of the river is stagnant or the water level rises slowly, there is a problem that the floating door body does not block.

  Therefore, the present invention is such that the door body is easy to open even when foreign matter is mixed in or the amount of drainage is low, and the door body is blocked even when the water level is stagnant or the water level rises slowly. It is to provide a flap gate that can be made possible.

In order to achieve the above object, the invention according to claim 1 of the present invention is attached to a wall surface provided with a drainage hole that opens to a river side, and is hinged to the wall surface above the drainage hole. A flap gate comprising a suspension member swingable back and forth with respect to the drain hole, and a door body connected to a lower end of the suspension member and capable of opening and closing the drain hole,
A balance member connected to the suspension member is integrally fixed to an outer surface of the door body opposite to the drainage hole, and the balance member is made different in specific gravity between the door body and the balance member. The specific gravity and volume are determined so that the relationship of the following formula (1) is established, where a is the specific gravity of a, c is the volume, b is the specific gravity of the door body, and d is the volume. In a state where the water level does not reach the door body, the center of gravity of the door body and the balance member is positioned in the front-rear direction and closer to the drainage hole side than the hinge coupling position, and the door body is placed in the drainage hole. In the state in which the water level of the river reaches above the lower end of the door body, the position of the center of gravity is located on the opposite side of the drainage hole from the hinge coupling position in the front-rear direction. The drainage hole Characterized in that the fort to the standing position.

According to a second aspect of the present invention, in the flap gate according to the first aspect, the suspension member and the balance member are hinge-coupled.
According to a third aspect of the present invention, in the flap gate according to the first or second aspect, the hinge coupling position between the wall surface and the suspension member can be adjusted in the front-rear direction.
According to a fourth aspect of the present invention, in the flap gate according to the second or third aspect, the hinge coupling position between the suspension member and the balance member can be adjusted in the front-rear direction.

According to the first aspect of the present invention, the door body is easy to open even when foreign matter is mixed in or the amount of drainage is low, the river water level is stagnant, or the water level rises slowly. Even in such a case, the door can be reliably closed.
According to the second aspect of the present invention, the distance between the center of gravity and the hinge connection can be reduced, so that the initial opening angle of the door body can be increased.
In addition, according to the third aspect of the present invention, the front-rear position of the door body can be adjusted according to the field situation.
Further, according to the invention described in claim 4, since the position of the hinge can be adjusted, the initial opening angle of the door body or the height at which the door body starts to close can be adjusted.

(A) is explanatory drawing which shows the structure of the plane of a flap gate, (b) is explanatory drawing which shows the structure of a side surface. (A) is explanatory drawing which shows the state which the flap gate closed, (b) is explanatory drawing which shows the state which opened the flap gate. (A) (b) is explanatory drawing which shows the example of a change of a door. It is explanatory drawing which shows the example of a change of a flap gate.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1A shows the overall configuration of the flap gate 1, and FIG. 1B shows a side view.
First, as shown in FIG. 2, the flap gate 1 of the present invention is attached to a wall surface 20 having a drain hole 21 that opens to the river side, and is connected to the upper wall surface of the drain hole 21 by a hinge 15. The suspension member 7 is swingable forward and backward with respect to the drain hole 21 (the left side in FIG. 1B and FIG. 2 is the front side), and is connected to the lower end of the suspension member 7 to connect the drain hole 21. It is the structure provided with the door body 2 which can be opened and closed.

Of these, the door 2 is a rectangular plate made of synthetic resin such as fiber reinforced foamed urethane (FFU-74) having a specific gravity of about 0.74. As shown in FIG. The water-stopping rubber 12 made of chloroprene rubber is attached to the peripheral edge of the rear side 2, and the drain hole 21 is closed at the time of closing to prevent the water from flowing down.
On the other hand, on the water level 22 side of the door body 2 (the front side of the door body 2), there is a balance member 3 formed in an inverted L shape with stainless steel having a specific gravity of about 7.93 via left and right hanging metal fittings 4 and 4. Attached to the surface.

Then, when the specific gravity of the balance member is a, the volume is c, the specific gravity of the door body is b, and the volume is d, the specific gravity and the volume are determined so that the following formula (1) is satisfied. .

Next, in the hinge 15, the mounting plate 8 is provided with suspension brackets 11, 11 on the left and right in the longitudinal direction. The suspension bracket 11 is provided with a hole through which a cylindrical suspension rod 9 can be inserted. Has been. In addition, a hole through which the suspension rod 9 can be inserted is formed in one end of the suspension member 7. Then, by inserting the suspension rod 9 into one hole at the tip of the suspension member 7 and the hole of the suspension fitting 11, one end of the suspension member 7 can be swung with respect to the mounting plate 8.
In addition, split pins 10 and 10 for preventing the suspension rod 9 from coming off the suspension fitting 11 and the suspension member 7 are inserted at both ends of the suspension rod 9.

On the other hand, here, the suspension members 7 and 7 and the balance member 3 are also connected by the hinge 16.
In the hinge 16, a hole that allows the column-shaped suspension rod 5 to be inserted is formed in the suspension fitting 4 of the door body 2. In addition, a hole through which the suspension bar 5 can be inserted is formed in the other end of the suspension member 7. The other end of the suspension member 7 can be swung with respect to the door body 2 by inserting the suspension bar 5 into the other hole at the end of the suspension member 7 and the hole of the suspension fitting 4.
That is, the hinge 15 and the hinge 16 employ a double hinge having two swinging portions. Note that split pins 6 and 6 that prevent the suspension rod 5 from coming off the suspension fitting 4 and the suspension member 7 are also inserted at both ends of the suspension rod 5.

A process in which the water at the water level 23 flows down from the drain hole 21 to the water level 22 of the river in front of the door body 2 by the flap gate 1 configured as described above will be described.
First, as shown in FIG. 2A, in the state where the water level 22 does not reach the door body 2, the center-of-gravity position G obtained by combining the center of gravity position of the door body 2 and the center of gravity position of the balance member 3 is Thus, a moment in the clockwise direction around the suspension bar 5 is generated because it is located on the drain hole 21 side behind the position of the suspension bar 5 of the hinge 16. Therefore, the door body 2 is inclined to open the drain hole 21, and the water on the water level 23 side flows down to the water level 22 side.

Here, since the specific gravity differs between the door body 2 and the balance member 3, the horizontal gravity center position G in a state where the gravity center position of the door body 2 and the gravity center position of the balance member 3 overlap each other is a cross-section of the balance member 3. When the primary moment is Sy1, the volume is A1, the specific gravity is B1, the cross-sectional primary moment of the door body 2 is Sy2, the volume is A2, and the specific gravity is B2, it can be obtained from the following relational expression.

  In this case, the center of gravity in a state where the water level 22 does not reach the door body 2 is lower than the center of gravity in the state where the water level 22 reaches above the lower end of the door body 2, and the initial inclination of the door body 2 increases as the difference increases. Since the posture (angle) is increased, it is possible to increase the rotational moment generated when the door body 2 is in the standing posture when the water level 22 rises.

Thereafter, as shown in FIG. 2 (b), when the water level 22 reaches above the lower end of the door body 2, the underwater weight of the door body 2 decreases, so that the gravity center position G moves forward from the suspension bar 5. Thus, the door body 2 rotates counterclockwise. Therefore, the door body 2 is in a standing posture in which the drain hole 21 is closed.
When the water level 22 further rises, the water at the water level 22 presses the door body 2, so that the periphery of the drain hole 21 is more tightly closed by the door body 2, and the water at the water level 23 side flows down to the water level 22 side. There is nothing to do.

The flap gate 1 configured in this way integrally fixes the balance member 3 to which the suspension member 7 is connected to the outer surface of the door body 2 opposite to the drain hole 21, and the door body 2 and the balance member 3. When the specific gravity of the balance member 3 is a, the volume is c, the specific gravity of the door body 2 is b, and the volume is d, the relationship of the above formula (1) is established. Determine the specific gravity and volume.
Thereby, in a state where the water level 22 of the river does not reach the door body 2, the center of gravity position G of the door body 2 and the balance member 3 is located in the front-rear direction and closer to the drainage hole 21 than the position of the hinge 15. In a state where the body 2 is inclined to open the drain hole 21 and the water level 22 of the river reaches above the lower end of the door body 2, the center of gravity position G is in the front-rear direction and on the opposite side of the drain hole 21 from the position of the hinge 15. By positioning the door body 2 in an upright posture that closes the drain hole 21, the door body 2 can be easily opened even when foreign matter is mixed in or when there is little drainage, and the water level 22 of the river stays. Even if the water level rises slowly, the door body 2 can be reliably closed.

In addition, the structure of the flap gate of the present invention is not limited to the aspect of the above-described embodiment. If the position of the center of gravity of the door body moves back and forth due to fluctuations in the water level, the flap gate can be opened and closed. The present invention can be changed as necessary without departing from the spirit of the invention.
For example, the shape of the balance member 3 does not necessarily have an inverted L shape, and can be changed as appropriate.

  In addition, the hinge coupling may employ a single hinge having one swinging position and can be changed as appropriate. That is, the suspension metal fitting 4 and the lower end portion of the suspension member 7 are integrally formed so that the upper end portion of the suspension member 7 can swing with respect to the suspension fitting 11. As a result, the swinging locus of the door body 2 draws a constant arc so that the door body 2 is not affected by the friction of the drain hole 21 when the drain hole 21 is closed. In this case, the center of gravity position moves back and forth with respect to the single hinge.

  Moreover, the shape of the door body 2 does not necessarily need to be a square, and a circular plate material shown in FIG. 3A or a lower circular plate material shown in FIG. 3B may be used. Furthermore, as long as the drain hole 21 is closed and the flow of water is controlled, it may be changed to another shape, and can be changed as appropriate.

In addition, as shown in FIG. 4, the holes drilled in the hanging bracket 11 have the through-holes of the suspension rod 9 as the long holes 25 in the front-rear direction and the through-holes of the suspension bar 5 as the lengths in the front-rear direction. It may be changed to the hole 28 and can be changed as appropriate.
Therefore, by enabling the position of the hinge 15 between the wall surface 20 and the suspension member 7 to be adjusted in the front-rear direction by the long hole 25, the front-rear position of the door body 2 can be adjusted according to the field situation. In this case, the hinge 15 is positioned and fixed by welding the heads of the bolts 26 to the left and right in the longitudinal direction of the surface of the mounting plate 8, and sandwiching the suspension rod 9 with nuts 27 and 27 screwed onto the bolts 26. The suspension rod 9 is moved back and forth by screw feed of the nuts 27 and 27.

  Further, since the position of the hinge 16 between the suspension member 7 and the balance member 3 can be adjusted in the front-rear direction by the long hole 28, the distance between the center of gravity and the hinge 16 can be reduced. Since the position 16 can be adjusted, the initial opening angle of the door body 2 or the height at which the door body starts to close can be adjusted. In this case, the position adjustment and fixing of the hinge 16 is performed by screwing the bolt 29 from the front to the nut 30 welded to the inside of the hanging metal fitting 4 and pressing the suspension bar 5 backward by screw feed by rotation of the bolt 29.

  1 ・ ・ Flap gate 2 ・ ・ Door body 3 ・ ・ Balance member 4 ・ ・ Hanging bracket 5 ・ ・ Hanging rod 6 ・ ・ Split pin 7 ・ ・ Hanging member 8 ・ ・ Mounting plate 9 ..Hanging rod, 10 .. Split pin, 11 ..Hanging bracket, 12 ..Waterproof rubber, 15 ..Hinge (mounting plate side), 16 ..Hinge (hanging bracket side), 20.・ ・ Drain hole, 22 ・ ・ Water level (front side of door), 23 ・ ・ Water level (back side of door), 25 ・ ・ Long hole (mounting plate side), 26 ・ ・ Bolt (mounting plate side), 27..Nut, 28..Long hole (hanging bracket side), 29..Bolt (hanging bracket side), 30..Nut.

Claims (4)

A suspension member attached to a wall surface having a drainage hole that opens to the river side, hinged to the wall surface above the drainage hole and swingable back and forth with respect to the drainage hole, and a suspension member A flap gate connected to a lower end and provided with a door body capable of opening and closing the drain hole,
A balance member connected to the suspension member is integrally fixed to an outer surface of the door body opposite to the drainage hole, and the balance member is made different in specific gravity between the door body and the balance member. The specific gravity and volume are determined so that the relationship of the following formula (1) is established, where a is the specific gravity of a, c is the volume, b is the specific gravity of the door body, and d is the volume. In a state where the water level does not reach the door body, the center of gravity of the door body and the balance member is positioned in the front-rear direction and closer to the drainage hole side than the hinge coupling position, and the door body is placed in the drainage hole. In the state in which the water level of the river reaches above the lower end of the door body, the position of the center of gravity is located on the opposite side of the drainage hole from the hinge coupling position in the front-rear direction. The drainage hole Flap gate which is characterized in that the fort to the standing position.

  The flap gate according to claim 1, wherein the suspension member and the balance member are hinge-coupled.   The flap gate according to claim 1 or 2, wherein a hinge coupling position between the wall surface and the suspension member can be adjusted in the front-rear direction.   The flap gate according to claim 2 or 3, wherein a hinge coupling position between the suspension member and the balance member can be adjusted in the front-rear direction.

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