JP2016065447A - Flap gate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flap gate capable of completely closing a door body when a water level rises, and capable of smoothly draining water by reducing a hindrance of a water flow to the external water side from the internal water side when draining the water, even when requiring large initial opening like a water passage having no laying step difference.SOLUTION: A flap gate comprises a door body 2 that can freely swing around a door body rotary shaft 21 provided above an opening part 61 and is supported by a weight balance for closing the opening part 61, an external float 3 for vertically floating in response to lifting of an external water side water level and door body opening-closing control means 4 for acting so as to open the opening part 61 when this external float 3 descends, acting so as to close the opening part 61 when the external float 3 rises by buoyancy and acting so as to open the opening part 61 by rotating the door body 3 in the opening direction by a water flow from the internal water side when a drainage quantity from the internal water side increases.SELECTED DRAWING: Figure 1

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, flap gates have been provided at Xiamen and Sluice Gates to prevent tides in river mouths and backflow of rivers.

  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 attached to the swinging arm at a predetermined angle with respect to the swinging arm. The door body, a balance weight provided on the opposite side of the door body across the rotation shaft, for adjusting the swing of the door body, and an adjustment arm provided on the outside water side of the rotation shaft; The adjustment arm is movably provided, and is provided with an adjustment weight for adjusting the rotational moment of the door body, and an inner lower portion of the door body, and the floating center is located inside the center of gravity of the door body. Flapge made of float Bets 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.

  In addition, unlike a flap gate, there is a gate that opens and closes an open end of a water channel by moving a sluice vertically. For example, Japanese Patent Laid-Open No. 2014-15710 discloses a cutoff gate that can be moved up and down on the side wall portion and that can open and close a water intake, a float that can be moved up and down following fluctuations in the water level upstream of the water intake dam, There has been proposed a water intake control device that includes a connection mechanism that connects a float and a shut-off gate to follow the rise or fall of the float and lowers or raises the shut-off gate (Patent Document 2).

JP 2012-57322 A JP 2014-15710 A

  However, as shown in FIG. 20, the conventional flap gate including the flap gate described in Patent Document 1 has a structure in which the door body swings back and forth around the upper rotation shaft to close the opening. A step called a floor step is provided at the bottom of the water channel below the opening. Since there is this floor step, even if the opening degree (initial opening degree) of the door body is slight, a sufficient gap between the water channel and the door body is secured, and the slight drainage from the inside water side is not hindered. However, as shown in FIG. 21, in an existing water channel without a level difference or a water channel that is not provided with a level difference due to hydraulic limitations, the water from the internal water side to the external water side In order not to impede the flow of the door, it is necessary to increase the initial opening of the door body.

  Specifically, when a conventional flap gate is installed in a water channel without a level difference, the lower end of the door body draws an arc-shaped trajectory, so a certain amount of clearance is required between the lower end of the door body and the bottom surface of the water channel. Become. Without this gap, the lower end of the door body comes into contact with the bottom surface of the water channel and stops before the door body is completely closed, and the door body cannot be closed to the end. On the other hand, providing the gap ensures a watertight state. The problem of being unable to do so occurs.

  In addition, as shown in FIG. 22, where deposits such as earth and sand often accumulate on the bottom surface of the water channel, the door blocks rocking by the deposits, and thus the door can be completely blocked. It becomes impossible.

  Moreover, in the invention described in Patent Document 2, even if the channel has no floor level difference, it is possible to open and close the lock gate or the like according to the water level of the channel, and thus backflow can be prevented. However, since the opening and closing of the shut-off gate depends only on the water level of the water channel, when the water level rises and the shut-off gate closes, the water cannot be drained even if there is a water flow from the intake dam side. Therefore, there is a problem that the water on the intake dam side overflows.

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

  A flap gate according to the present invention is a flap gate that opens and closes an opening in a structure such as a lock gate, and is swingable around a rotation axis of a door provided above the opening, and the opening is opened. The door body supported by the weight balance to be closed, the external float that floats up and down in response to the elevation of the water level on the outside water side of the opening, and the weight lifts the door body when the external float descends When the external float is lifted by buoyancy, the door body is rotated in the closing direction by its own weight according to the rise, and the opening is closed. When the amount of drainage from the internal water side increases, the door body opens and closes to open the opening by rotating the door body in the opening direction by the water flow from the internal water side And a control means.

  Further, as one aspect of the present invention, the door body opening / closing control means is capable of swinging up and down with a float receiving arm that is pivotably supported integrally with the door body around the rotation axis of the door body. You may make it have the float support arm which hold | maintains the said external float in the one end part, and supports the said float receiving arm in the other end part so that isolation | separation is possible while being pivotally supported.

  Furthermore, as one aspect of the present invention, the float support arm may be supported so as to be swingable up and down along the water channel wall surface on the outside water side.

  Further, as one aspect of the present invention, when the structure has a lateral wall extending in a lateral direction on the outside water side along the door contact surface of the opening, the float support arm swings up and down along the lateral wall. It may be movably supported.

  Furthermore, as one aspect of the present invention, the door body opening / closing control means includes a float receiving arm that is pivotally supported integrally with the door body around the rotation axis of the door body, and above the external float. You may make it have a pulley provided and the wire which connects the said external float and the said float receiving arm via this pulley.

  Furthermore, as one aspect of the present invention, a pit communicated with a water channel on the outside water side by a water conduit is provided outside the water channel, and the external float is disposed in the pit so that the water level in the pit is You may make it float up and down according to a fluctuation | variation.

  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 side view showing a first embodiment of a flap gate according to the present invention. It is a front view which shows the flap gate of this 1st embodiment. It is a side surface enlarged view which shows the support state of the float receiving arm and float support arm in this 1st embodiment. It is a front enlarged view which shows the support state of the float receiving arm and float support arm in this 1st embodiment. It is a side view which shows the state which contact | abutted to the opening part from the lower end part of the door main body, when the door main body in the flap gate of this 1st embodiment obstruct | occludes an opening part. It is a side view which shows other embodiment which fixed the door main body with respect to the rocking | swiveling arm while installing the flap gate which concerns on this invention in the inclined opening part. In the first embodiment, when the float support arm rotates following the rise of the external float, the float receiving arm can be rotated in the door closing direction. In the first embodiment, the float support arm rotates following the rise of the external float and the float receiving arm is separated from the float support arm. The state which the opening part was completely closed by the flap gate of this 1st embodiment is shown. In this 1st embodiment, the state which rotates the said door body in the open direction by the water flow from the inside water side, and has opened the opening part is shown. It is a side view which shows 2nd embodiment of the flap gate which concerns on this invention. It is a front view which shows the flap gate of this 2nd embodiment. The state which the opening part was completely closed by the flap gate of this 2nd embodiment is shown. In this 2nd embodiment, the state which rotates the door body to the open direction by the water flow from the inside water side, and has opened the opening part is shown. It is a front view which shows 3rd embodiment of the flap gate which concerns on this invention. It is a side view which shows the flap gate of this 3rd embodiment. It is a schematic diagram which shows the state which the float support arm and the float receiving arm in this 3rd embodiment cross | intersect. It is a front view which shows the state which the float support arm in this 3rd embodiment rotated with the buoyancy of the external float. It is a front view which shows other embodiment of the flap gate which concerns on this invention. It is the side view and enlarged view of a lower end part which show the conventional type flap gate installed in the waterway which has a spreading | diffusion level | step difference. It is a figure which shows the rocking | fluctuation locus | trajectory of a door body at the time of installing the conventional type flap gate in the waterway without a level | step difference. It is a side view which shows the relationship between a door body and a deposit in the case of installing a conventional type flap gate in a waterway without a floor step.

  Hereinafter, a first embodiment of a flap gate according to the present invention will be described 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 embodiment described later, the flap gate according to the present invention is applied to a water channel without a step, but the present invention is not limited to this configuration, and can be applied to a water channel with a step. is there.

  The flap gate 1A of the first embodiment opens and closes an opening 61 in a structure 6 such as a lock gate, and is provided above the opening 61 as shown in FIGS. The door body 2 supported by the door body rotating shaft 21, the external float 3 that floats up and down as the water level on the outside water side of the opening 61 rises and lowers, and the weight of the external float 3 in the direction of lifting the door body 2 Door body opening / closing control means 4 for transmitting as force.

  The door body 2 mainly includes a door body rotating shaft 21 that is rotatably supported upward, a pair of swing arms 22 that are fixed to the door body rotating shaft 21 and are swingably supported, and a structure 6. A door main body 23 capable of opening and closing the opening 61, and a balance weight 24 for adjusting the open / close balance of the door main body 23.

  As shown in FIGS. 1 and 2, the door rotating shaft 21 is for swingably supporting a door body 23 via a swing arm 22. In the first embodiment, the door rotating shaft 21 is formed in a columnar shape and is supported by a pair of bearings 25 installed on the top of the structure 6 so as to be rotatable in a substantially horizontal direction. In addition, a pair of swing arms 22 are fixed to the door body rotation shaft 21 in a state where the pair of swing arms 22 is penetrated. Further, as shown in FIG. 1, the pair of bearings 25 is fixed to the structure via a bearing fixture 26 provided above the opening 61.

  The pair of swing arms 22 are formed in the same shape, and are fixed in the same posture with respect to the door body rotating shaft 21 penetrating through a substantially middle portion. For this reason, the pair of swing arms 22 are supported so as to be swingable around the door body rotation shaft 21. A door body 23 is attached to the lower end of each swing arm 22, and a balance weight 24 is attached to the upper end of each swing arm 22.

  The door main body 23 is for opening and closing the opening 61 of the structure 6 and is formed in a size capable of closing the opening 61. Further, as shown in FIG. 1, the door main body 23 in the first embodiment is swingably supported at each lower end portion of the pair of swing arms 22 via a door main body hinge 27. For this reason, the door main body 23 swings around the door body rotation shaft 21 and also swings around the door body hinge 27. Further, as shown in FIG. 5, when the door body 23 closes the opening 61, the door body 23 is supported in an inclined state that can come into contact with the opening 61 from the lower end of the door body 23.

  Further, as shown in FIG. 1, the shaft hole 28 of the door hinge 27 that supports the door body 23 is formed in an elongated hole shape that is longer in the vertical direction than the diameter of the hinge shaft 29. When it contacts the lower surface 63 of the water channel 62, it can be displaced in the vertical direction.

  Note that the door main body 23 is not limited to one that is swingably supported with respect to the swing arm 22, and in order to reduce the manufacturing cost, as shown in FIG. It may be fixed to the swing arm 22 without using the body hinge 27. Further, the opening 61 is not limited to the one having a vertical door contact surface, and is inclined downward toward the outside water according to the fixing angle between the door main body 23 and the swing arm 22. The water may be stopped by eliminating the gap between the lower end portion of the door main body 23 and the lower surface 63 of the water channel 62 when closed.

  The balance weight 24 is for adjusting the open / close balance of the entire door body 2 and is attached so as to straddle the upper ends of the pair of swing arms 22 as shown in FIGS. 1 and 2. With this configuration, due to the rotational moment in the closing direction of the center of gravity of the door body 23 and the rotational moment in the opening direction of the center of gravity of the balance weight 24 via the door body rotation shaft 21, the weight of the external float 3 as will be described later The weight is adjusted so that the door main body 23 has a weight balance for closing the opening 61 when it is not subjected to a lifting force or water pressure due to a water flow.

  The external float 3 floats as the water level on the outside water side of the opening 61 rises and lowers, and has a structure in which air, foamed urethane, or the like is sealed with a steel plate, synthetic resin, or the like to generate buoyancy. Further, as will be described later, the external float 3 serves as a weight for lifting the door body 2 to an open state, and has a weight capable of lifting the door body 2 to an open state via the door body opening / closing control means 4. have. In the first embodiment, as shown in FIGS. 1 and 2, a protective cover 31 is provided so as to cover the external float 3 and the door body opening / closing control means 4, and the external float 3 and the door body opening / closing are provided. The control means 4 prevents dust and the like from adhering to malfunction. The external float 3 in the first embodiment is formed in a substantially disk shape as shown in FIG. 1, but is not limited to this, and a shape that easily floats up and down in the protective cover 31. Can be appropriately selected.

  The door body opening / closing control means 4 transmits the weight of the external float 3 as a force in the direction of lifting the door body 2. That is, as shown in FIG. 1, in the first embodiment, the float receiving arm 41 fixed to the door rotating shaft 21, and the float receiving arm 41 is used for the weight of the external float 3 by the lever principle. And a float support arm 42 that transmits the force in the direction of lifting the body 2.

  As shown in FIGS. 3 and 4, the float receiving arm 41 includes a pair of arm side plates 43 and a roller 44 provided on the distal end side of these arm side plates 43. The pair of arm side plates 43 are formed in the same substantially elliptical shape, and the base end portion is fixed to the door body rotating shaft 21. For this reason, the pair of arm side plates 43 is configured to swing integrally with the door body 2 via the door body rotating shaft 21. The roller 44 is supported by the float support arm 42 so as to be separable and makes the float support arm 42 easy to slide according to the inclination angle of the door body 2. In the first embodiment, It is formed in a cylindrical shape and is rotatably provided at the distal end side of the pair of arm side plates 43.

  The float support arm 42 transmits the weight of the external float 3 to the float receiving arm 41. In the first embodiment, the float support arm 42 moves along the water channel wall surface 64 by the float rotation shaft 45 provided on the water channel wall surface 64. It is pivotally supported so that it can swing up and down. Further, as shown in FIG. 1, the external float 3 is provided at one end of the float support arm 42, and the float support arm 42 swings following the movement of the external float 3. It has become.

  Further, the other end of the float support arm 42 supports the float receiving arm 41 so as to be lifted from below as shown in FIGS. For this reason, the float support arm 42 opens the door body 2 to the float receiving arm 41 in the opening direction (FIG. 3) with respect to a rotational moment that rotates in the closing direction (counterclockwise direction in FIG. 3) due to its own weight. (Clockwise direction) is applied, and the door body 2 is lifted so as not to be closed and the initial opening degree is maintained. On the other hand, since the float support arm 42 supports the float receiving arm 41 so as to be separable, the door body 2 can be freely rotated in the opening direction. Therefore, when the water flow from the inside water side increases and the door body 2 opens more than the initial opening degree, the float support arm 42 does not exert any restrictive action.

  Further, as shown in FIGS. 1, 5, 9, and 10, a lower limit stopper 46 and an upper limit stopper 47 are provided at the lower limit position and the upper limit position on the orbit where the external float 3 floats up and down, respectively. As shown in FIG. 1, the lower limit stopper 46 determines the initial opening degree of the door body 2, and at a position where the door body 2 is lifted to a predetermined angle in the opening direction, the external float 3 is below its height. The external float 3 is received so as not to descend. The initial opening can be arbitrarily determined, and as shown in FIG. 1, the initial opening can be set large in a water channel having no floor level difference. On the other hand, the upper limit stopper 47 prevents the external float 3 from jumping out of the water channel 62 while allowing the door body 2 to be fully closed by raising the external float 3. Then, it is provided slightly above the height at which the door 2 can be fully closed.

  Next, the operation of each component in the flap gate 1A of the first embodiment will be described.

  First, in a state where the door body 2 is not affected by the water flow, as shown in FIG. 1, the weight of the external float 3 is transmitted as the lifting force of the door body 2, and the door body 2 rotates in the opening direction. It is stationary at the position of the initial opening. In the first embodiment, since the initial opening is greatly opened, the gap between the door body 2 and the bottom surface of the water channel 62 can be kept large. Thereby, even if it is a waterway without a level | step difference, a water flow can be appropriately drained from the inside water side to the outside water side, without interfering with the door body 2. FIG.

  In addition, when the door body 2 is rotating in the opening direction such as maintaining the initial opening position, when the wind blows from the outside water side to the inside water side, the door body 2 is A rotational moment is generated that attempts to close. However, since the door body 2 is lifted in the opening direction by the weight of the external float 3, the door body 2 is not easily closed. Therefore, the door body 2 does not make noise or break due to collision with a lock gate or the like.

  Next, as shown in FIG. 5, when the water level on the external water side rises and buoyancy acts on the external float 3, the external float 3 rises according to the water level. The float support arm 42 follows the floating of the external float 3 and rotates in the clockwise direction in FIG. 7 about the float rotation shaft 45, and lowers the other end. When the other end portion of the float support arm 42 is lowered in this way, the support position of the float receiving arm 41 is lowered, so that the door body 2 is closed in the closing direction due to the rotational moment in the closing direction (counterclockwise direction in FIG. 7) due to its own weight. To turn.

  Then, as shown in FIGS. 8 and 9, when the external float 3 is raised to the extent that it abuts on the upper limit stopper 47, the other end of the float support arm 42 is separated from the roller 44 of the float receiving arm 41. In such a state, since the weight of the external float 3 cannot be transmitted to the door body 2 via the float support arm 42, the door body 2 is fully closed by a rotational moment in the closing direction due to its own weight. At this time, in the door body 2, the center of gravity of the balance weight 4 is in the closing direction (counterclockwise direction in FIG. 9) due to being located on the outside water side from the door body rotating shaft 21 as shown in FIG. A rotational moment and a rotational moment in the closing direction due to a hydraulic load are applied. Therefore, the opening 61 is completely closed by the door body 2.

  In the first embodiment, the door hinge 27 is held in an inclined state in contact with the opening 61 from the lower end of the door body 23 as shown in FIG. First, it comes into contact with the opening 61 from the lower end. After the lower end portion of the door main body 23 comes into contact with the opening 61, when the door body 2 further rotates in the closing direction, the lower end portion of the door main body 23 receives a reaction force from the opening 61. As a result, the door body 23 swings around the door hinge 27 so that the back surface (surface on the inner water side) is in a substantially vertical direction, so that the lower end portion of the door body 23 is lowered. At this time, the door hinge 27 moves further downward along the swing locus of the swing arm 22. Therefore, the lower end portion of the door main body 23 extends along the opening 61 by a downward stroke that is a sum of the downward amount of the door body hinge 23 relative to the door body rotation shaft 21 in addition to the downward amount of the door body hinge 27. It will descend vertically downward. Therefore, even if the flap gate 1A of the first embodiment is installed in the water channel 62 or the like without a level difference, as shown in FIG. 9, the door main body 23 automatically shuts the opening 61 completely without power. In addition, the water on the outside water side is prevented from flowing back into the waterway at the time of disasters such as floods and storm surges.

  In addition, even if there is a deposit on the bottom surface 63 of the water channel 62 that cannot be pushed away by the door body 2, in the first embodiment, the lower end of the door body 23 abuts the deposit, When the lowering is prevented, the hinge shaft 29 moves downward in the shaft hole 28 and absorbs the remaining downward stroke. As a result, the swinging motion of the swinging arm 22 is not restricted, and the door body 23 swings around the door hinge 27, so that the opening 61 is closed by the door body 23 and the watertight state is maintained. Secure and completely occluded.

  On the other hand, since the door body 2 is not restricted at all by the external float 3 or the door body opening / closing control means 4 with respect to rotation in the opening direction, it can freely rotate in the opening direction regardless of the floating position of the external float 3. Can move. Therefore, the door body 2 can freely rotate in the opening direction by the water flow flowing from the inner water side to the outer water side, and can be appropriately drained from the inner water side to the outer water side.

  In particular, as shown in FIG. 10, when the external float 3 is raised to the upper limit position where it abuts on the upper limit stopper 47 following the rise in the water level on the outside water side, the water intake described in Patent Document 2 as described above. In the conventional gate that automatically opens and closes following the float of the float, including the volume control device, the water intake and the like are kept closed and cannot be drained, whereas the flap of this first embodiment The door body 2 in the gate 1A is rotated in the opening direction (clockwise direction in FIG. 10) by flowing water from the inside water side to the outside water side, buoyancy acting on the door body 2, and the like, from the inside water side to the outside water side. It can drain properly.

According to the first embodiment as described above, the following effects can be obtained.
1. Since the opening degree of the door body 2 can be increased by lifting the door body 2 using the weight of the external float 3, the effect can be exhibited in a sluice or the like having no floor level difference.
2. The angle at which the door body 2 is lifted can be automatically adjusted by floating the external float 3 up and down following the water level fluctuation on the outside water side.
3. When the external float 3 rises to the upper limit position, the float receiving arm 41 is separated from the float support arm 42, and the door body 2 can fully close the opening 61. Backflow can be prevented.
4). When the door body 2 rotates in the opening direction due to the water flow from the internal water side, the external float 3 does not cause any restrictive action, so even if the external float 3 rises to the upper limit position. The door body 2 can be opened and drained reliably.

  Next, a second embodiment of the flap gate according to the present invention will be described with reference to FIGS. In the flap gate 1B of the second embodiment, a description of the same or equivalent configuration as that of the above-described first embodiment will be omitted.

  The features of the flap gate 1B of the second embodiment are that, in the configuration of the first embodiment, the external float 3 is provided in the pit 5 provided outside the water channel 62, and the door body opening / closing control. The means 4 is composed of a pulley 48, a wire 49 and the like. Hereinafter, a configuration based on each feature will be described.

  As shown in FIGS. 11 and 12, the external float 3 in the second embodiment is provided in the pit 5, and is configured to be able to float up and down according to the water level fluctuation in the pit 5. The pit 5 is a vertical hole-shaped space formed by a steel pipe, a concrete wall, or the like outside the water channel 62, and is communicated with the water channel 62 on the outside water side by the water conduit 51. Therefore, water can flow into the pit 5 from the outside water side, and the water level in the pit 5 varies in conjunction with the water level on the outside water side. Further, a filter such as a wire mesh 52 is provided at a portion where water is introduced into the water conduit 51 in the second embodiment so that dust or the like flowing through the water channel does not enter the pit 5.

  The door body opening / closing control means 4 in the second embodiment includes a float receiving arm 41 fixed to the door body rotating shaft 21, a pulley 48 provided above the external float 3, and the external float via the pulley 48. 3 and the wire 49 for connecting the float receiving arm 41.

  The pulley 48 converts the weight of the external float 3 in the direction of gravity into a direction in which the door body 2 is lifted. In the second embodiment, as shown in FIG. 12, two pulleys 48, 48 are rotatably provided above the external float 3 and above the float receiving arm 41, respectively. It is connected by a pulley connecting shaft 50. The number of pulleys 48 is not limited.

  The wire 49 is for transmitting the weight of the external float 3 as a force in the direction of lifting the door body 2. One end of the wire 49 is connected to the external float 3, and the other end is connected to the roller 44 of the float receiving arm 41 via the pulley 48.

  Further, the other end of the wire 49 has a shaft hole 50 formed in an elongated hole shape that is longer in the vertical direction than the diameter of the roller 44, and the door body 23 is rotated in the opening direction. The roller 44 can slide up and down the shaft hole 53 in accordance with the vertical displacement of the wire 49.

  With the above configuration, the external float 3 floats up and down according to the water level in the pit 5 that fluctuates in conjunction with fluctuations in the water level on the outside water side, and opens and closes the door body 2 by the same action as in the first embodiment described above. Control. That is, the door body 2 is kept open at the initial opening degree by the weight of the external float 3 in the pit 5, and when the water level in the pit 5 rises, the external float 3 is raised to move the door body 2. On the other hand, when draining from the inside water side, the door body 2 is rotated in the opening direction by the water flow from the inside water side and drained. At this time, since the wire 49 moves in the direction of releasing the tension (the direction of slackening), the external float 3 does not disturb the opening operation. Further, in the second embodiment, since dust or the like flowing through the water channel 62 does not enter the pit 5, dust or the like is not caught on the external float 3, and maintenance is easy. Therefore, an unnecessary rotational moment due to the weight of dust or the like is not added to the rotational moment for opening the door body 2 caused by the weight of the external float 3, and the door body according to the planned balance and vertical position. 2 can be controlled to open and close. Further, since the external float 3 is outside the water channel, it does not obstruct the drainage.

  Moreover, in the door body opening / closing control means 4 in the second embodiment, the weight of the external float 3 is transmitted as a force in the direction of lifting the door body 2 by the wire, and the door body 2 is held at a predetermined initial opening degree. Yes. When the external float 3 rises as the water level in the pit 5 rises, the wire 49 of the external float 3 rises and the wire 49 on the float receiving arm 41 side descends. Therefore, the door body 2 rotates in the closing direction by its own weight as in the flap gate 1A of the first embodiment as shown in FIG. 13, and automatically closes the opening 61 without power. Can do.

  Furthermore, since the roller 44 can slide in the shaft hole 50 in the vertical direction, the door body 2 flows from the inside water side to the outside water side as shown in FIG. 14 as with the flap gate 1A of the first embodiment. It can freely rotate in the opening direction (clockwise direction in FIG. 14) by water flow or the like, and can be appropriately drained from the inside water side to the outside water side.

  As described above, according to the flap gate 1B of the second embodiment, the same effect as that of the flap gate 1A of the first embodiment can be obtained by using the pulley 48, the wire 49, and the like.

  Next, a third embodiment of the flap gate according to the present invention will be described with reference to FIGS. In addition, about the structure equivalent to or equivalent to the structure of 1st embodiment and 2nd embodiment which were mentioned above among 1 C of flap gates of this 3rd embodiment, description for the second time is abbreviate | omitted.

  A feature of the flap gate 1 </ b> C of the third embodiment is that, in the configuration of the first embodiment, the float support arm 42 of the door body opening / closing control means 4 is formed along the door contact surface 61 of the opening 61. It is a point provided in. Hereinafter, a configuration based on the features of the third embodiment will be described.

  As shown in FIGS. 15 and 16, the flap gate 1 </ b> C of the third embodiment is provided in a structure 6 such as a coastal bank. The structure 6 is not provided with a so-called linear water channel wall surface 64 on the outside water side, but is provided with a lateral wall 65 extending in the lateral direction on the outside water side along the door contact surface 61 of the opening 61. ing.

  The door body opening / closing control means 4 in the third embodiment includes a float receiving arm 41 fixed to the door body rotating shaft 21 and a float support arm 42 as in the first embodiment. However, in the third embodiment, the float support arm 42 cannot be provided on the water channel wall surface 64 as in the first embodiment. Therefore, the float support arm 42 in the third embodiment is provided on the horizontal wall 65 along the door contact surface 61 of the opening 61.

  As shown in FIG. 17, the float receiving arm 41 according to the third embodiment is made of a cylindrical bar, and is provided at a substantially right angle with respect to the door rotating shaft 21 toward the outside water side.

  The float support arm 42 is pivotally supported by a float rotation shaft 45 provided on the horizontal wall 65 so as to be swingable up and down along the horizontal wall 65. One end of the float support arm 42 is provided with the external float 3 as in the first embodiment, and swings following the movement of the external float 3.

  Further, as shown in FIG. 17, the other end portion of the float support arm 42 is substantially orthogonal to the float receiving arm 41 and is disposed below the float receiving arm 41. Therefore, like the first embodiment, the other end portion is configured to be able to be separated from the float receiving arm 41 and can lift the float receiving arm 41 from below.

  Next, the operation of each component in the flap gate 1C of the third embodiment will be described.

  In the third embodiment, when the water level of the water channel 62 and the outside water side is low and the door body 2 is not affected by the water flow, the float support arm 42 is provided with the external float 3 as shown in FIGS. 15 and 16. Is transmitted as the lifting force of the door body 2, and the door body 2 is stopped at the position of the initial opening. Specifically, the float support arm 42 transmits the weight of the external float 3 to the other end using a float rotation shaft 45 provided on the horizontal wall as a fulcrum, and the other end transmits the weight of the transmitted external float 3. To lift the float receiving arm 41 from below. The door body 2 is held at a predetermined initial opening degree that is not completely closed by the lifting force from the other end.

  On the other hand, when the water level on the outside water side rises, buoyancy acts on the external float 3 and rises according to the water level. As shown in FIG. 18, the float support arm 42 rotates along the horizontal wall 65 around the float rotation shaft 45 following the floating of the external float 3, and the other end is lowered. The float receiving arm 41 is lowered as the other end portion is lowered, and the door body 2 is rotated in the closing direction by a rotating moment in the closing direction due to its own weight.

  Moreover, since the door body 2 can be separated as in the first embodiment, it can freely rotate in the opening direction regardless of the floating position of the external float 3. Therefore, the door body 2 can freely rotate in the opening direction by the water flow flowing from the inside water side to the outside water side, and can appropriately drain from the inside water side to the outside water side.

  As described above, according to the flap gate 1C of the third embodiment, even if there is no water channel wall surface 64 on the outside water side and the opening 61 is provided along the lateral wall 65 extending in the lateral direction, By installing the support arm 42 on the lateral wall 65 on the outside water side, the same effect as the flap gate 1A of the first embodiment can be obtained.

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

  For example, the door body 2 in each embodiment has a balance weight, but may be a door body that does not have a balance weight.

  Moreover, although the external float 3 in the first embodiment is provided in the water channel 62, as shown in FIG. 19, it may be provided in the pit 5 as in the external float 3 in the second embodiment. However, the external float 3 in the third embodiment may also be provided in the pit 5.

DESCRIPTION OF SYMBOLS 1 Flap gate 2 Door body 3 External float 4 Door body opening / closing control means 5 Pit 6 Structure 21 Door body rotating shaft 22 Swing arm 23 Door main body 24 Balance weight 25 Bearing 26 Bearing fixture 27 Door main body hinge 28 Shaft hole 29 Hinge shaft 31 Protective cover 41 Float receiving arm 42 Float support arm 43 Arm side plate 44 Roller 45 Float rotation shaft 46 Lower limit stopper 47 Upper limit stopper 48 Pulley 49 Wire 50 Pulley connecting shaft 51 Water guide pipe 52 Wire net 53 Shaft hole 61 Opening (per door surface)
62 water channel 63 bottom surface 64 water channel wall surface 65 side wall

Claims (6)

A flap gate that opens and closes an opening in a structure such as Xiamen,
A door body swingable around a door rotation axis provided above the opening and supported by a weight balance that closes the opening;
An external float that floats up and down as the water level rises and falls on the outside water side of the opening,
When the external float descends, its weight is transmitted as a force in the direction of lifting the door body to act to open the opening, and when the external float rises by buoyancy, the door body according to the rise Is rotated in the closing direction by its own weight to close the opening, and when the amount of drainage from the inner water side increases, the door body is rotated in the opening direction by the water flow from the inner water side. A flap gate having door body opening / closing control means which acts to open the opening.   The door body opening / closing control means is pivotally supported so as to be swingable around the door body rotation axis integrally with the door body, and is pivotally supported so as to be swingable up and down and at one end thereof. The flap gate according to claim 1, further comprising a float support arm that holds the external float and supports the float receiving arm at the other end so as to be separable.   The flap gate according to claim 2, wherein the float support arm is supported so as to be swingable up and down along a waterway wall surface on the outside water side.   When the structure has a lateral wall extending in the lateral direction on the outside water side along the door contact surface of the opening, the float support arm is supported so as to be swingable up and down along the lateral wall. Item 3. The flap gate according to Item 2.   The door body opening / closing control means includes a float receiving arm that is pivotally supported integrally with the door body so as to be swingable around the door body rotation shaft, a pulley provided above the external float, and via the pulley. The flap gate according to claim 1, further comprising a wire connecting the external float and the float receiving arm.   A pit communicated with a water channel on the outside water side by a water conduit is provided outside the water channel, and the external float is disposed in the pit and floats up and down according to a water level fluctuation in the pit. The flap gate according to any one of claims 1 to 5.

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