JP2019044420A - Flap gate - Google Patents

Abstract

To provide a flap gate that is less likely to cause troubles due to drift even if water in a main flow path is increased.SOLUTION: The flap gate comprises a support girder 2 having an extension portion 21, a gate main body 3 disposed below the extension portion 21 of the support girder 2, a float 4 provided at the lower end portion of the gate main body 3, and a link mechanism 5 including a balance weight 56 and swingably supporting the gate main body 3 on the extension portion 21 of the support girder 2. The link mechanism 5 is configured such that the whole including the balance weight 56 is located below a slope 10a and the balance weight 56 is located above a branch flow path 11 over the entire movable range of the gate main body 3.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a flap gate that prevents backflow or the like to a tributary by opening and closing a drainage port of a tributary such as a canal joining a main channel such as a river or an estuary in accordance with the flow rate of each channel.

  Conventionally, a flap gate is known that prevents backflow from the main flow path to the branch flow path by opening and closing the drainage port of the tributary flow path such as a canal that joins the main flow path such as a river according to the flow rate of each flow path. The applicant has also developed and proposed a flap gate as disclosed in Patent Document 1.

  As shown in FIG. 5, the flap gate 100 disclosed in Patent Document 1 includes a support girder including an extending portion 102 that protrudes and extends in the drainage direction (X direction) from the position of the drainage port 111 a of the branch channel 111. 101, a gate body 103 provided with a float 104, which is disposed below the extending portion 102, and a link for supporting the gate body 103 on the extending portion 102 so that the gate body 103 can swing. And a mechanism.

  The link mechanism includes a first link 106 swingably supported by the support girder 101, and a second link 107 swingably supported by the support girder 101 at a position closer to the drainage direction than the first link 106. In the parallel link mechanism, the gate body 103 is supported at the lower ends of both the links 106 and 107. The first link 106 is provided with an upwardly extending piece 106b that extends upward and toward the second link 107, that is, toward the main flow channel 110, and the balance weight 105 is held by the tip (upper end) of the upwardly extending piece 106b. There is. With this configuration, when the water flow in the main flow passage 110 and the tributary flow passage 111 is less than the predetermined water amount, the weight of the balance weight 105 causes the gate to move to the middle swing position B1 (position shown by solid line) separated from the drainage port 111a by the predetermined gap t2. When the main body 103 is held and the amount of water in the main flow passage 110 becomes equal to or more than the predetermined amount of water, the gate main body 103 is lifted by the buoyancy of the float 104 to close the drainage port 111a. Is to be placed.

Patent No. 6114169 gazette

  However, in the flap gate of Patent Document 1, the first link 106 is provided with the upwardly extending piece 106b extending upward and toward the main flow passage 110, and the balance weight 105 is held at the tip of the upwardly extending piece 106b. When actually implemented, the balance weight 105 protrudes outward from the slope 113 of the main flow channel 110, and for example, when the main flow channel 110 is flooded, the drifting material flowing in the main flow channel 110 is the balance weight 105 The link mechanism may be damaged, or a drifting object may be attached to the balance weight 105 to cause malfunction. In addition, it is possible that the balance weight 105 is noticeable and becomes a target of mischief.

  The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a flap gate which is less likely to cause a trouble due to a drift even when the main flow path is increased.

  In order to solve the above-mentioned subject, the present invention is the flap gate which opens and closes the outlet of the tributary which joins with the main channel which had a slope according to the flow of each of the above-mentioned channels, A support girder provided with an extending portion which is provided at a position above and lower than the slope and which protrudes from the position of the drainage port so as to project in the drainage direction, and the lower portion of the extending portion of the support girder And a float provided at the lower end of the gate body, and a balance weight, the gate body swings between a closed position for closing the outlet and an open position for opening the outlet. In order to be movable, and when the water flow in each of the flow paths is less than a predetermined amount of water, the weight of the balance weight makes the gate main body at a predetermined intermediate swing position between the closed position and the open position. Said gate to be held And a link mechanism for supporting the body on the support girder, wherein the link mechanism is configured to be located below the slope over the entire movable range of the gate body. Provide a gate.

  According to the configuration of the flap gate, since the link mechanism is configured to be located below the slope over the entire movable range of the gate body, even if the main flow path is flooded, the drifting object is a balance weight It is difficult to collide with or attach to each part of the link mechanism. In addition, since the balance weight is positioned below the slope, it is difficult to be noticeable and to be a target of mischief.

  Preferably, in the flap gate, the link mechanism is configured such that the balance weight is located above the branch flow path.

  According to this configuration, it is possible to favorably secure a space in which the balance weight is displaced above the support girder without causing the balance weight to protrude outward from the slope. Therefore, it is advantageous to construct the above-mentioned crank mechanism which is located below the slope over the entire movable range of the gate body.

  More specifically, in the flap gate, the link mechanism is disposed on the side of the drainage direction of the first link pivotally supported by the support girder and swayed to the support girder. A second link supported movably, a third link opposite to the second link with the first link interposed therebetween, and a third link pivotally supported by the support girder, and the first link And a fourth link connecting the third link, wherein the first link extends from the supporting position upward and toward the third link from the supporting position of the gate main body extending downward from the supporting position by the supporting girder. And a fourth link connecting piece, wherein the second link extends downward from a position supported by the support girder and is parallel to the gate main body supporting piece in a state where the gate main body is disposed at the intermediate swing position. Arranged as A third link support rotatably supported by the support girder such that the third link is located between one end and the other end and the other end is located above the branch flow path The fourth link is rotatably coupled to each of the fourth link connection piece of the first link and the one end of the third link, and the gate body is disposed at the intermediate swing position The lower end of the gate main body support piece of the first link and the first link so that the third link is displaced to the closing position as the third link swings in one direction around the third link support from the state of The lower end of the second link is rotatably supported, and the balance weight is held at the other end of the third link.

  According to this configuration, while the link mechanism is configured to be located below the slope over the entire movable range of the gate body, the gate body can be favorably swung between the closed position and the open position. It becomes possible.

  In this case, in a state where the gate main body is in the intermediate rocking position, in a direction opposite to a rocking direction of the first link when the gate main body is rocked from the intermediate rocking position to the closed position. A link rocking restriction member is provided which restricts rocking of the first link, and the second link is rotatably connected to the support girder and movably connected to the support girder. Is preferred.

  According to this configuration, for example, when the pressing force in the drainage direction is applied to the gate body in the intermediate swing position with the branch flow path increasing, the first, third, and fourth links are restricted from swinging. The upper end of the two links moves relative to the support girder. As a result, the gate body swings around the connection between the first link and the gate body support piece and is displaced to the open position. Therefore, it is possible to swing the gate body more largely while restricting the movable range of the link mechanism as much as possible, that is, without adopting a configuration that causes the link mechanism to protrude outward from the slope.

  The link swing restricting member is provided with a third link stop portion that contacts the third link to limit the swing of the third link in the other direction opposite to the one direction. Is preferred.

  The link rocking regulating member may be in direct contact with the first link to regulate the rocking, but according to the above configuration, due to the relationship with the position of the slope, the relatively loose margin around the third link It is possible to provide the link swing restricting member by utilizing a space having a

  According to the present invention, it is possible to provide a flap gate which is less likely to cause a trouble due to a drift even when the main flow path is increased.

It is a side view of a flap gate of the present invention. It is a front view of the said flap gate. It is a side view in the state where a gate body is in a closed position which closed a drainage. It is a side view when a gate body opens a drainage port. It is a side view of the conventional flap gate.

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

  FIG. 1 is a side view of the flap gate of the present invention, and FIG. 2 is a front view of the flap gate.

  The flap gate 1 of the present invention opens and closes the outlet 12 of the tributary 11 such as a canal which joins the main channel 10 such as a river or an estuary according to the flow rate of each of the channels 10 and 11. The backflow to the branch flow path 11 is prevented. The main flow passage 10 has a slope 10a, and in this embodiment, the outlet 12 of the branch flow passage 11 has a rectangular shape.

  As shown in FIGS. 1 and 2, the flap gate 1 opens and closes a pair of left and right support beams 2 provided above the branch flow path 11 and lower than the slope 10 a, and a gate that opens and closes the drainage port 12. It comprises a main body 3, a float 4 for giving buoyancy to the gate main body 3, and a link mechanism 5 for supporting the gate main body 3 on the support girder 2.

  Each support girder 2 includes an inner and outer pair of outer support girder 2a and an inner support girder 2b. The outer support girder 2a and the inner support girder 2b are disposed at predetermined intervals.

  The outer support girder 2 a and the inner support girder 2 b are provided with an extending portion 21 which protrudes and extends from the position of the drainage port 12 in the drainage direction (X direction).

  The gate main body 3 is provided with a rectangular main body portion 31 having a size capable of closing the drainage port 12 and suspension brackets 32 provided on the left and right ends of the upper end portion of the main body portion 31.

  The gate body 3 can swing between a closed position A2 (the position shown by the solid line in FIG. 3) closing the drainage port 12 and an open position A3 (the position shown by the one-dot chain line in FIG. 4) opening the drainage port 12 As described above, when the water flow in each of the flow paths 10 and 11 is less than the predetermined water amount, the weight of the balance weight 56 described later causes the gate body 3 to move in the predetermined intermediate swing position A1 between the closed position A2 and the open position A3. It is held at (the position shown in FIG. 1). The intermediate rocking position A1 is a position where the gate body 3 is separated from the drainage port 12 by a predetermined gap t1, that is, a position separated from the closing position A2 by a predetermined gap t1. Therefore, when the gate body 3 is in the middle swing position A1, the drainage port 12 is opened, whereby flowing water of the branch flow path 11 flows into the main flow path 10 through the drainage port 12.

  The float 4 is disposed at the lower end portion of the gate body 3 over the entire width from the left end to the right end.

  The link mechanism 5 includes a first V-shaped first link 51, a linear second link 52 disposed on the side of the first link 51 in the drainage direction (X direction), and a second link 51 sandwiching the first link 51. Regulating the swing of the third link 53, which is a straight third link 53 disposed on the opposite side of the link 52, the fourth link 54 which connects the first link 51 and the third link 53, and the third link 53 A link swing restricting member 55 and a balance weight 56 are provided, and are arranged below the slope 10a over the entire movable range of the gate body 3.

  The first link 51 is rotatably supported by the gate main body support piece 511, the fourth link connection piece 512 substantially perpendicular to the gate main body support piece 511, and the extending portion 21 of the support girder 2 And a support portion 513. The first link support portion 513 is provided at a position between the gate body support piece 511 and the fourth link connection piece 512.

  The gate main body support piece 511 extends from the position of the first link support portion 513 (that is, the support position by the support girder 2) to the lower side of the support girder 2, and pivots with the suspension bracket 32 of the gate main body 3 at the lower end. A gate main body connecting portion 511a to be connected is provided. The fourth link connection piece 512 extends from the position of the first link support 513 toward the upper side of the support girder 2 and the third link 53 side.

  The second link 52 is formed to have substantially the same length as the gate main body support piece 511 of the first link 51, and becomes parallel to the gate main body support piece 511 in the state where the gate main body 3 is at the intermediate swing position A1. Arranged as. At an upper end portion of the second link 52, a second link connecting portion 521 which is an elongated hole extending in the longitudinal direction of the link is provided. The second link 52 is rotatably supported relative to the extending portion 21 of the support girder 2 by the second link 52 being supported by the support shaft on the extending portion 21 side via the second link connecting portion 521. And, it is connected so as to be movable relatively in the longitudinal direction of the link.

  The lower end portion of the second link 52 is rotatably connected to the suspension bracket 32 of the gate body 3.

  The third link 53 is provided with a third link support portion 531 rotatably supported by the support girder 2 at an intermediate portion between the one end portion 532 and the other end portion 533. The one end 532 of the third link 53 is disposed on the first link 51 side, and the other end 533 of the third link 53 is disposed on the opposite side of the first link 51 with the third link support 531 interposed therebetween. There is.

  The other end 533 of the third link 53 is disposed above the branch flow path 11. In this embodiment, the other end 533 of the third link 53 and the third link support 531 are disposed above the branch flow path 11, but the present invention is not limited to this. May be disposed above the branch flow passage 11 and can be changed as appropriate.

  The fourth link 54 is rotatably connected to the fourth link connection piece 512 of the first link 51 and the one end 532 of the third link 53, respectively.

  When the third link 53 swings around the third link support 531 due to the configuration of the link mechanism 5 as described above, specifically, clockwise in FIG. 1 (one side of the present invention, the Z1 direction in FIG. 3), the gate body 3 is swung from the intermediate swing position A1 to the closing position A2 shown by the solid line in FIG. 3 via the fourth link 54 and the first and second links 51 and 52.

  The third link 53 is turned counterclockwise in FIG. 1 (in the other direction side of the present invention, in the Z2 direction side in FIG. 1) in the state where the gate body 3 is at the intermediate rocking position A1. It is to regulate swinging. The link swing restricting member 55 is fixedly fixed to the support girder 2, and includes a third link contact stop 551 that contacts the third link 53 to restrict the swing of the third link 53. . The third link contact / stopper 551 abuts on the third link 53 from the upper side in the state where the gate main body 3 is in the intermediate swing position A1.

  The balance weight 56 is held by the third link 53 in a state of being bridged to the other end 533 of the left and right third links 53, that is, the end opposite to the first link 51. Thus, the balance weight 56 is disposed above the branch flow channel 11.

  In the link mechanism 5 configured in this way, when the water flow in each of the flow paths 10 and 11 is less than the predetermined water amount, the weight of the balance weight 56 makes the gate main body 3 intermediate between the closed position A2 and the open balance weight position A3. It is set to be held at the swinging position A1.

  Specifically, as shown in FIG. 1, with the gate main body 3 in the intermediate swing position A1, the horizontal distance from the first link support portion 513 of the first link 51 to the gate main body connecting portion 511a is a, The horizontal distance from the link support portion 513 to the connection portion between the fourth link connection piece 512 and the fourth link 54 is d, and the third link support portion 531 of the third link 53 to the third link 53 and the fourth link 54 Assuming that the horizontal distance to the connecting part is e, the horizontal distance from the third link support 531 to the center of the balance weight 56 is b, the weight of the gate main body 3 is Wg, and the weight of the balance weight 56 is Wb, The opening moment M1 (clockwise in FIG. 1) around the first link support 513 acting on the gate body 3 by the weight Wg and the weight Wb of the balance weight 56 The first link supporting part 513 around a closed moment M2 acting on the body 3 (the counterclockwise moment in FIG. 1) is represented by the following formula.

M1 = Wg × a
M2 = Wb × b × (d / e)
And in this embodiment, the horizontal distances a, b, d, e and weights Wg, Wb are set so that M1 = M2.

  With this configuration, when the water flow in each of the flow paths 10 and 11 is less than the predetermined water amount (the state in FIG. 1), the weight of the balance weight 56 holds the gate main body 3 at the intermediate swing position A1.

  Next, the operation of the flap gate 1 of this embodiment will be described. From the state of FIG. 1, when the water level of the main flow passage 10 rises, the buoyancy F of the float 4 acts on the gate body 3 and thereby the closing moment M3 around the first link support 513 on the gate body 3 (FIG. Then the counterclockwise moment) works.

  Specifically, assuming that the buoyancy of the float 4 is F and the distance from the first link support 513 to the center of the float 4 is c, the gate body 3 further includes the closing moment M3 = F in addition to the moments M1 and M2. X c works. As a result, the relationship of moments M1 to M3 around the first link support 513 of the gate main body 3 is M1 <M2 + M3. As shown by the solid line in FIG. 3, the gate main body 3 is closed from the intermediate swing position A1 to the closed position A2. Swing to As a result, the drainage port 12 is closed by the gate body 3, and backflow of water from the main flow passage 10 to the tributary flow passage 11 is prevented.

In the state where the gate body 3 is in the closing position A2, as shown in FIG. 3, the horizontal distance from the first link support portion 513 to the connecting portion of the fourth link connecting piece 512 and the fourth link 54 is d1, The horizontal distance from the third link support 531 of the third link 53 to the connection between the third link 53 and the fourth link 54 is e1, and the horizontal distance from the third link support 531 to the center of the balance weight 56 is b1. When the horizontal distance from the first link support 513 to the center of the float 4 is c1, the moments M1 to M3 around the first link support 513 of the gate main body 3 are
M1 = Wg × a1
M2 = Wb × b1 × (d1 / e1)
M3 = F1 × c1
It becomes. Therefore, the relationship of moments M1 to M3 around the first link support portion 513 of the gate main body 3 is M1 <M2 + M3, and the gate main body 3 is pressed from the main flow path 10 side to the branch flow path 11 at the closing position A2. Become.

  Next, when the water level of the branch flow channel 11 becomes high from the state of FIG. 1, the gate body 3 is pressed toward the main flow channel 10 by the water pressure of the branch flow channel 11. By the pressing force, the third link 53 receives a force so as to swing counterclockwise in FIG. 1 (the Z2 direction side in FIG. 1) via the first and fourth links 51 and 54. However, in the third link 53, the link swing restricting member 55 restricts the counterclockwise swing, so that the swing of the first and fourth links 51 and 54 is also limited.

  Therefore, when the gate main body 3 is pressed toward the main flow passage 10 by receiving the pressing force, the gate main body 3 is swung around the gate main body connecting portion 511a. At this time, as shown in FIG. 4, the second link 52 moves in the longitudinal direction of the link while rotating with respect to the extending portion 21 of the support girder 2, whereby the swing of the gate main body 3 is allowed. Ru. Thus, the gate body 3 swings to the half open position A4 shown by the solid line in FIG. 4 and further to the open position A3 shown by the one-dot chain line according to the pressure, that is, according to the flow rate of the support channel 11. Become. Thus, the water smoothly flows from the branch flow passage 11 to the main flow passage 10, and the back flow from the main flow passage 10 to the branch flow passage 11 is prevented.

  In addition, even when the gate main body 3 swings to the open position A3 in this manner, the length of the second link 52 and the second link connection are connected so that the second link 52 does not protrude outward from the slope 10a. The dimensions of the part 521 are set.

  As described above, according to the flap gate 1 of the present invention, the link mechanism 5 is configured such that the entire mechanism including the balance weight 56 is positioned below the slope 10a over the entire movable range of the gate body 3 Even if the main flow path 10 is increased in water, it is difficult for the drifting object to collide with the link mechanism 5 or to adhere to each part of the link mechanism 5. In particular, since the balance weight 56 is disposed above the branch flow path 11, there is little possibility that the drifting object collides with or adheres to the balance weight 56. Therefore, according to the flap gate 1, a drifting object collides with the balance weight 56 to damage the link mechanism 5 or a drifting material adheres to the balance weight 56 and other parts to cause malfunction of the gate main body 3. It is less likely to cause troubles due to drifting things such as triggering. In addition, since the balance weight 56 is positioned below the slope 10a, the link mechanism 5 is less noticeable, and thus, it is difficult to be a target of mischief.

  Further, according to the flap gate, when the branch flow path 11 is increased while the gate main body 3 is in the middle swing position A1, when pressure is applied to the gate main body, the first, third and fourth The swinging of the links 51, 53, 54 is restricted, and the gate body 3 swings around the gate body connection portion 511a of the first link 51 according to the magnitude of the pressing force. That is, the gate body 3 swings to the half open position A4 and further to the open position A3. Therefore, it is possible to swing the gate body 3 more largely while restricting the movable range of the link mechanism 5 as much as possible, that is, without making the link mechanism 5 protrude outward from the slope 10a.

  In this case, as described above, the link rocking restriction member 55 restricts the rocking of the third link 53 by coming into contact with the third link 53. There is an advantage that the link swing restricting member 55 can be provided utilizing a relatively large space around the link 53. That is, by providing the link swinging restricting member 55 around the third link 53 having a sufficient space, it is possible to prevent the link swinging restricting member 55 from jumping outward from the slope 10a.

  The flap gate described above is an illustration of a preferred embodiment of the flap gate according to the present invention, and the specific configuration can be changed without departing from the scope of the present invention. For example, the following configuration may be employed.

  In the above embodiment, the link rocking restriction member 55 is configured to regulate rocking of the third link 53, but the present invention is not limited to this form, and can be changed as appropriate. For example, the link swing control member 55 may limit the swing of the first link 51 and the fourth link 54. Also, with the gate main body 3 in the intermediate swing position A1, the third link 53 supports the third link 53 by the one end 532 of the third link 53 coming into contact with the branch channel forming portion forming the branch channel 11 It may be configured such that it can not swing around the portion 531 in the other direction. In short, in the state where the gate body 3 is in the intermediate swing position A1, the link swing restricting member 55 swings the first link 51 when the gate body 3 swings from the intermediate swing position A1 to the closing position A2. It is sufficient that the swing of the first link 51 in the direction opposite to the moving direction can be regulated directly or indirectly.

DESCRIPTION OF SYMBOLS 1 flap gate 2 support girder 3 gate main body 4 float 5 link mechanism 10 main flow path 10a slope 11 tributary flow path 12 drainage port 51 1st link 52 2nd link 53 3rd link 54 4th link 55 link rocking regulation member 56 balance weight

Claims (5)

It is a flap gate which opens and closes the drainage port of the tributary channel which joins to the main channel having a slope according to the flow rate of each channel,
A support girder provided with an extension portion which is provided above the branch flow channel and lower than the slope and which protrudes from the position of the drainage port in the drainage direction;
A gate body disposed below the extension of the support girder;
A float provided at the lower end of the gate body,
The balance body includes a balance weight so that the gate body can swing between a closed position for closing the drainage port and an open position for opening the drainage port, and when the water flow of each flow path is less than a predetermined water amount A link mechanism for supporting the gate main body on the support girder such that the weight of the balance weight holds the gate main body at a predetermined intermediate swing position between the closed position and the open position. Equipped
The flap gate, wherein the link mechanism is configured to be located below the slope over the entire movable range of the gate body. In the flap gate according to claim 1,
The flap gate, wherein the link mechanism is configured such that the balance weight is located above the branch flow path. In the flap gate according to claim 1 or 2,
The link mechanism includes a first link swingably supported by the support girder, and a second link disposed on the drainage direction side of the first link and swingably supported by the support girder. A third link arranged on the opposite side of the second link with the first link interposed therebetween and pivotally supported by the support girder, and a fourth link connecting the first link and the third link Equipped with
The first link includes a gate main body support piece extending downward from a support position by the support girder, and a fourth link connection piece extending from the support position upward and toward the third link.
The second link extends downward from a support position by the support girder, and is disposed parallel to the gate body support piece when the gate body is disposed at the intermediate swing position.
A third link support rotatably supported by the support girder such that the third link is located between one end and the other end and the other end is located above the branch flow path Equipped with
The fourth link is rotatably connected to each of a fourth link connection piece of the first link and the one end of the third link.
The first link is displaced such that the gate body is displaced to the closing position as the third link pivots in one direction around the third link support from the state in which the intermediate pivoting position is located. Rotatably supported at the lower end of the gate body support piece and the lower end of the second link,
The flap gate, wherein the balance weight is held at the other end of the third link. In the flap gate according to claim 3,
In a state where the gate body is in the intermediate rocking position, the first in the direction opposite to the rocking direction of the first link when the gate body is rocked from the intermediate rocking position to the closed position. A link swing restricting member for restricting the swing of the link;
The flap gate, wherein the second link is rotatably connected to the support girder and movable relative to the support girder. In the flap gate according to claim 4,
The link swing restricting member includes a third link stop portion that contacts the third link to limit the swing of the third link in the other direction opposite to the one direction. A flap gate characterized by

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