JP5503072B1 - Flap gate - Google Patents

Abstract

[PROBLEMS] To close a door completely when the water level rises, even when a large initial opening is required, such as a waterway without a level difference, and when it is drained, Provided is a flap gate that can reduce water flow obstruction to the water side and drain smoothly.
A flap gate 1A that opens and closes a door body 4 with respect to an opening 91 in a structure 9 such as a lock gate, and the door body 4 is provided on the back surface of the door body 4 in accordance with a rise in water level. A moving float 6A is provided that moves in a direction away from the door and moves in a direction approaching the door body due to a water flow during drainage.
[Selection] Figure 3

Description

  The present invention relates to a flap gate that opens and closes an opening of a structure, and particularly relates to a flap gate suitable for opening and closing a lock gate, a sluice gate, and the like.

  Conventionally, sluice gates and sluice gates have been provided with flap gates to prevent river tides and river backflow.

  As such a flap gate, for example, Japanese Patent Application Laid-Open No. 2012-57322 is a flap gate including a door body that swings due to a difference in internal and external water pressure at an opening end of a water channel at a confluence of the internal water side and the external water side. A rotating shaft provided on the upper outer side of the opening end, a swinging arm provided on the lower part of the rotating shaft, and tilting at a predetermined angle with respect to the swinging arm. The attached door body, a balance weight for adjusting the swing of the door body provided on the opposite side of the door body across the rotation shaft, and an adjustment provided on the outside water side of the rotation shaft An arm, an adjustment weight that is movably provided on the adjustment arm, and an adjustment weight for adjusting the rotational moment of the door body; A flap game consisting of a float There has been disclosed (Patent Document 1).

  According to this flap gate, the balance of the moment of the entire gate can be finely adjusted, the door body is supported with a sufficient gap between the open end, and it responds well to fluctuations in the water level even at low water levels It is said that a flexible flap gate can be provided.

JP 2012-57322 A

  As shown in FIG. 8, the conventional flap gate including the flap gate described in Patent Document 1 has a structure in which the door body 4 swings back and forth around the upper rotation shaft 2 to close the opening 91. Therefore, a step called a floor step 10 is provided at the bottom of the water channel below the opening 91. Since there is this laying step 10, even if the opening degree (initial opening degree) of the door body 4 is slight, a sufficient gap between the water channel and the door body 4 is secured, and slight drainage from the inside water side is not hindered. However, as shown in FIG. 9, in an existing water channel without a floor step 10 or a water channel that is not provided with a floor step 10 due to hydraulic restrictions even from a newly constructed water channel, from the inside water side to the outside water side. In order not to obstruct the flow of water, it is necessary to increase the initial opening of the door body 4.

  Further, as shown in FIG. 10, a conventional automatic open / close flap gate is provided with a float 11 attached to the back surface of the door body 4 so as to be opened and closed by a change in buoyancy associated with rising and falling of the water level. For this reason, in the water channel with the spread step 10, the initial opening degree of the door body 4 may be small. Therefore, even if the float 11 is small, sufficient buoyancy that causes the door body 4 to generate a rotational moment in the closing direction can be obtained. it can.

  On the other hand, in the water channel without the spread step 10, the initial opening degree of the door body 4 must be increased as described above. For this reason, in order to generate a moment in the closing direction in the door body 4 due to the buoyancy of the float 11, as shown in FIG. 11, it is necessary to largely project the float 11 to the inside water side. However, in this structure, as shown in FIG. 12, there is a problem that the float 11 impedes the drainage during drainage such as an emergency when the drainage amount from the inside water side to the outside water side increases.

  The present invention has been made in order to solve such problems, and even when a large initial opening is required, such as a water channel without a level difference, a door is required when the water level rises. An object of the present invention is to provide a flap gate that can completely close the body and that can prevent water flow from the inner water side to the outer water side during drainage and can drain smoothly.

  The flap gate which concerns on this invention is a flap gate which opens and closes a door body with respect to the opening part in structures, such as a lock gate, Comprising: The back surface of the said door body leaves | separates from the said door body according to the rise of a water level. A moving float is provided that moves in the direction and moves in a direction approaching the door body by the water flow during drainage.

  Further, as one aspect of the present invention, a bracket fixed to the back surface of the door body and a float arm whose base end is swingably supported by the bracket, the movable float has a floating center However, you may fix to the front-end | tip part of the said float arm in the state eccentric to the inner water side rather than the synthetic gravity center of the said float arm and the said movement float.

  Furthermore, as one aspect of the present invention, there is provided a stopper abutting portion provided at a base end portion of the float arm, and an arm stopper that abuts on the stopper abutting portion and regulates the swing range of the float arm. The arm stopper may abut on the stopper abutting portion at a position where the buoyancy of the moving float swings to the inside water side with respect to the rotating shaft.

  Further, as one aspect of the present invention, a guide rail that is inclined upward and away from the door body is fixed to the back surface of the door body, and the movable float slides along the guide rail. It may be movably attached.

  According to the present invention, even when a large initial opening is required, such as a channel without a level difference, the door can be completely closed when the water level rises, The obstruction of the water flow from the side to the outside water side can be reduced and the water can be drained smoothly.

It is a front view which shows 1st Embodiment of the flap gate which concerns on this invention. It is a rear view which shows the flap gate of this 1st Embodiment. It is a flap gate of this 1st Embodiment, Comprising: It is a side view which shows the use condition at the normal time. It is a flap gate of the first embodiment, and is a side view showing a state in which a door body starts to swing in a closing direction. It is a flap gate of this 1st Embodiment, Comprising: It is a side view which shows the state by which the door body was obstruct | occluded. It is a flap gate of this 1st Embodiment, Comprising: It is a side view which shows the state by which the door body was open | released. It is a side view which shows the flap gate of this 2nd Embodiment. It is a side view which shows the initial stage opening degree of the door body in the conventional flap gate installed in the waterway which has a spreading | diffusion level | step difference. It is a side view which shows the initial opening degree of a door body required when the conventional type flap gate is installed in the waterway without a level | step difference. It is a side view which shows the state provided with the float in the conventional flap gate installed in the waterway which has a spreading | diffusion level | step difference. It is a side view which shows the state provided with the fixed float required in order to fully close a door body, when installing the conventional type flap gate in the waterway without a level | step difference. In the flap gate shown in FIG. 11, it is a side view which shows the state in the case of draining from the inside water side to the outside water side.

  Embodiments of a flap gate according to the present invention will be described below with reference to the drawings. In addition, the flap gate which concerns on this invention is applicable to all the structures which have an opening part which needs opening and closing of a water channel like a lock gate, a sluice gate, and a valve, disaster prevention equipment. Further, in each of the embodiments described later, the flap gate according to the present invention is applied to a water channel without a step 10, but the present invention is not limited to this configuration, and can be applied to a water channel having a floor step 10. Is.

  A flap gate 1A according to the first embodiment opens and closes a door body 4 with respect to an opening 91 in a structure 9 such as a lock gate. As shown in FIGS. A rotary shaft 2 rotatably supported above the body 4, a pair of swing arms 3 and 3 fixed to the rotary shaft 2 and swingably supported, and an opening 91 of the structure 9 can be opened and closed. The door body 4, a balance weight 5 for adjusting the opening / closing balance of the door body 4, and a movable float 6 </ b> A movable with respect to the door body 4. Hereinafter, each configuration will be described in detail.

  As shown in FIGS. 1 to 6, the rotary shaft 2 is for swingably supporting the door body 4 via the swing arms 3 and 3. In the first embodiment, the rotating shaft 2 is formed in a columnar shape, and is supported by a pair of bearings 71 and 71 installed on the top of the structure 9 so as to be rotatable in a substantially horizontal direction. In addition, a pair of swing arms 3 and 3 are fixed to the rotary shaft 2 in a penetrating manner. As shown in FIGS. 1 and 2, the pair of bearings 71, 71 are provided in the vicinity of both ends of the rotating shaft 2, and are fixed to the structure 9 via the bearing fixture 72.

  As shown in FIGS. 1 to 6, the pair of swing arms 3 and 3 are formed in the same shape, and are fixed in the same posture with respect to the rotary shaft 2 penetrating through the substantially intermediate portion. Therefore, the pair of swing arms 3 and 3 are supported so as to be swingable around the rotation shaft 2. A door body 4 is attached to the lower end of each swing arm 3, 3, and a balance weight 5 is attached to the upper end of each swing arm 3, 3.

  The door body 4 is for opening and closing the opening 91 of the structure 9, and as shown in FIGS. 1 to 6, the door 4 is formed in a size capable of closing the opening 91. The door body 4 is fixed to each lower end of the pair of swing arms 3 and 3 and is supported so as to be swingable around the rotation shaft 2. Furthermore, a watertight rubber 41 is provided on the inner water side surface of the door body 4 along the peripheral edge portion to maintain a watertight state with a door fitting provided in the opening 91.

  In the first embodiment, the door body 4 and the swing arms 3 and 3 are formed as separate bodies and are integrally fixed by bolts or the like. However, the present invention is not limited to this configuration. The body 4 and the swing arms 3 and 3 may be fixed by welding or the like, or the door body 4 and the swing arms 3 and 3 may be integrally formed by casting or forging. Moreover, the fixing method of the rotating shaft 2 and the swing arms 3 and 3 is also selected as appropriate, and may be fixed by welding or the like.

  Next, the balance weight 5 is for adjusting the opening / closing balance of the door body 4, and is attached so as to straddle the upper ends of the pair of swing arms 3 and 3, as shown in FIGS. It has been. With this configuration, the rotating body 2 stops at a position where the rotational moment in the closing direction of the center of gravity of the door body 4 and the rotational moment in the opening direction of the center of gravity of the balance weight 5 are balanced via the rotating shaft 2. Is the initial opening.

  In the first embodiment, the swinging arm 3, the door body 4, the balance weight 5, and the balance body 5 are arranged so that the door body 4 at the initial opening does not hinder drainage at a slight water depth where no water pressure is generated. A mobile float 6A and the like are designed. In the first embodiment, since the flap gate 1A is installed in the water channel without the level difference 10, the initial opening needs to be larger than the case where it is installed in the water channel with the level difference 10. .

  The moving float 6A is for giving a rotational moment in the closing direction to the door body 4, and is formed in a cylindrical shape by urethane foam or the like that easily generates buoyancy. The shape of the moving float 6A is not limited to a cylindrical shape, and may be an elliptical column shape, a rectangular column shape, or the like. In the first embodiment, the movable float 6A is provided so as to be movable with respect to the back surface of the door body 4 and moves away from the door body 4 as the water level rises. It is comprised so that it may move to the direction approaching the door body 4. FIG.

  Specifically, as shown in FIGS. 2 and 3, a pair of brackets 81, 81 fixed to the back surface of the door body 4, and a pair whose base end portions are swingably supported by the brackets 81, 81. And the arm stopper 83 for regulating the swing range of each of the float arms 82 and 82. As shown in FIG. 3, the moving float 6 </ b> A has a floating center at the tip of the floating arms 82 and 82 in a state where the floating center is eccentric to the inner water side of the combined center of gravity of the floating arms 82 and 82 and the moving float 6 </ b> A. It is fixed.

  Further, as shown in FIGS. 3 and 4, the arm stopper 83 abuts against a stopper abutting portion 82 a provided at the base end portion of the float arm 82 and regulates the swing range of the float arm 82. ing. Specifically, the arm stopper 83 is fixed to the bracket 81 so as to come into contact with the stopper contact portion 82a of the float arm 82 at a position where the float of the moving float 6A swings to the inside water side with respect to the rotating shaft 2. Has been.

  As described above, in the first embodiment, the floating float 6A is attached to the tip of the swingable float arms 82 and 82 so that the floating center of the movable float 6A can be moved in the horizontal direction. . With this configuration, as shown in FIG. 4, the moving float 6 </ b> A moves in a direction away from the door body 4 in order to rotate the float arm 82 toward the inside water by buoyancy obtained when the water level rises. When the stopper contact portion 82 a of the float arm 82 contacts the arm stopper 83, a moment due to the buoyancy of the moving float 6 </ b> A is transmitted to the float arm 82 and the bracket 81. For this reason, as shown in FIG. 5, a rotational moment is generated in the closing direction of the door body 4 with respect to the rotating shaft 2 so as to be completely closed.

  On the other hand, when the amount of drainage from the inside water side to the outside water side increases, as shown in FIG. 6, the moving float 6A rotates the float arm 82 toward the door body 4 by the water flow during drainage, and the door body 4 Move in the direction approaching. For this reason, the moving float 6A is attracted to the back surface of the door body 4, and the inhibition of drainage is reduced.

  Next, the operation of the flap gate 1A according to the first embodiment will be described.

  First, in a state where the door body 4 is not affected by the water flow, as shown in FIG. 3, the rotational moment in the closing direction of the center of gravity of the door body 4 or the like and the center of gravity of the balance weight 5 with respect to the rotating shaft 2. The flap gate 1A stops at a position where the rotational moment in the opening direction is balanced. In this stationary position, the door body 4 maintains a balance at a predetermined initial opening, so that even if the door body 4 is not affected by the water flow, the drainage can flow from the gap between the door body 4 and the bottom of the water channel to the outside water side. It is discharged towards.

  Next, when the water level on the inner water side gradually rises with the rise in the water level on the outer water side, as shown in FIGS. 4 and 5, the movable float 6A has a float arm in accordance with the rise in the water level due to its buoyancy. 3 is swung to move away from the door body 4. As a result, the floating center of the moving float 6 </ b> A moves to the inner water side from the rotating shaft 2, so that a rotational moment in the closing direction is generated in the door body 4. When the stopper contact portion 82 a of the float arm 82 contacts the arm stopper 83, the rotational moment is transmitted to the float arm 82 and the bracket 81. As a result, the door 4 automatically closes the opening 91 completely without any power, so that the water on the outside water side is prevented from flowing back into the water channel during a disaster such as flood or storm surge.

  On the other hand, when the amount of drainage from the internal water side to the external water side increases, the door body 4 swings in the opening direction due to the hydraulic load on the internal water side, and the mobile float 6A moves to the external water side due to the water flow during drainage. Is pushed. For this reason, the moving float 6 </ b> A swings the float arm 82 in the reverse direction and moves in a direction approaching the back surface of the door body 4. Thereby, as shown in FIG. 6, the moving float 6 </ b> A is drawn toward the back side of the door body 4, so that the obstruction of the water flow from the inner water side to the outer water side is reduced and can be drained smoothly.

According to the flap gate 1A of the first embodiment as described above, the following effects can be obtained.
1. Even when a large initial opening is required, such as a water channel without a laying step 10, when the water level rises, a rotating moment in the closing direction can be generated to completely close the door body 4.
2. At the time of drainage, the mobile float 6A can be housed on the back surface of the door body 4 to reduce the hindrance of the water flow from the inside water side to the outside water side and drain smoothly.
3. Even in a water channel without a laying step 10, an automatic opening / closing flap gate that can be opened and closed automatically without requiring external power such as a power source can be installed.
4). A compact movable float 6A can be adopted for an automatic open / close flap gate that is installed in a water channel having no floor 10.

  Next, a second embodiment of the flap gate according to the present invention will be described. Note that, among the configurations of the flap gate 1B according to the second embodiment, the same or corresponding components as those of the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 7, the flap gate 1 </ b> B according to the second embodiment has a pair of guide rails 84, 84 that are inclined upwardly away from the door body 4 on the back surface of the door body 4. ing. The movable float 6B is slidably attached along the guide rails 84, 84. Specifically, guide rollers may be provided at both ends of the movable float 6B, and the guide rollers may be configured to be slidable along the guide rails 84 and 84.

  With the above configuration, when the water level on the inner water side gradually rises as the water level on the outer water side rises, the moving float 6B moves upward along the guide rails 84 and 84 in accordance with the rise of the water level due to its buoyancy. It slides and moves in a direction away from the door body 4. As a result, the float of the moving float 6 </ b> B moves closer to the inner water side than the rotating shaft 2, so that a rotational moment in the closing direction is generated in the door body 4. Due to this rotational moment, the door body 4 automatically closes the opening 91 completely without any power, so that the water on the outside water side is prevented from flowing back into the water channel in the event of a disaster such as flood or storm surge.

  On the other hand, when the amount of drainage from the internal water side to the external water side increases, the door body 4 swings in the opening direction due to the hydraulic load on the internal water side, and the movable float 6B moves to the external water side due to the water flow during drainage. Is pushed. For this reason, the moving float 6 </ b> B slides downward along the guide rails 84, 84 and moves in a direction approaching the back surface of the door body 4. As a result, the moving float 6B is drawn toward the back side of the door body 4 as shown in FIG. it can.

  According to the flap gate 1B of the second embodiment as described above, the same effects as the flap gate 1A according to the first embodiment can be obtained.

  In addition, the flap gate which concerns on this invention is not limited to the structure of each embodiment mentioned above, It can change suitably.

  For example, in each of the above-described embodiments, the movable floats 6A and 6B are moved by the water level and buoyancy in order to automatically open and close the flap gate without power. However, the present invention is not limited to this configuration. It should just move in the direction away from door 4 and move to the outside water side at the time of drainage. For example, the water level may be monitored by a water level sensor, and the movable floats 6A and 6B may be moved by a drive motor or the like controlled by an output signal from the water level sensor.

1A, 1B Flap gate 2 Rotating shaft 3 Swing arm 4 Door body 5 Balance weight 6A, 6B Moving float 41 Watertight rubber 71 Bearing 72 Bearing fixture 81 Bracket 82 Float arm 82a Stopper contact part 83 Arm stopper 84 Guide rail 9 Structure Object 91 Opening 10 Laying step 11 Float

Claims (4)

A flap gate that opens and closes a door body with respect to an opening in a structure such as Xiamen,
A flap gate is provided on the back surface of the door body, which is provided with a moving float that moves in a direction away from the door body as the water level rises and moves in a direction approaching the door body due to a water flow during drainage.   A bracket fixed to the back surface of the door body, and a float arm whose base end is swingably supported by the bracket; and the floating float has a floating center, the float arm and the movable float The flap gate according to claim 1, wherein the flap gate is fixed to a distal end portion of the float arm in a state eccentric to the inner water side of the synthetic center of gravity.   A stopper abutting portion provided at a base end portion of the float arm; and an arm stopper that abuts against the stopper abutting portion and regulates a swing range of the float arm, and the arm stopper includes the moving float. The flap gate according to claim 2, wherein the buoyant core comes into contact with the stopper contact portion at a position where the buoyancy is swung to the inner water side with respect to the rotating shaft. A guide rail that is inclined so as to be separated from the door body upward is fixed to a rear surface of the door body, and the movable float is slidably attached along the guide rail. Item 2. The flap gate according to Item 1.

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