JP5503074B1 - Flap gate - Google Patents

Abstract

To provide a flap gate capable of maintaining a stable balance while maintaining a large initial opening degree of a door body.
A flap gate (1) for opening and closing a door body (4) with respect to an opening (91) in a structure (9) such as a lock gate, wherein a balance weight (5) for adjusting the opening / closing balance of the door body (4) is supplemented with a main weight (6). The main weight 6 and the auxiliary weight 7 are integrally rotated within a range in which the door body 4 is opened from a fully closed state to a predetermined inclination angle, and the door body 4 is In the range opened beyond a predetermined inclination angle, the auxiliary weight 7 is separated and only the main weight 6 rotates.
[Selection] Figure 1

Description

  The present invention relates to a flap gate that automatically opens and closes an opening of a structure such as a lock gate or a sluice according to a water flow.

  Conventionally, lock gates and sluice gates have been provided with openings to rivers, lakes, coasts, etc. for drainage, and gates intended to prevent backflow due to floods, storm surges, etc. Is provided. Many of these gates are manually opened and closed by an administrator, but there are cases where the management cost such as labor costs is high and the opening and closing work is dangerous.

  Therefore, in order to solve such problems, gates have been proposed that automatically open and close according to fluctuations in the water flow. For example, Japanese Patent Application Laid-Open No. 2012-57322 discloses 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 an internal water side and an external water side, A rotating shaft provided at an upper portion; a swinging arm provided at a lower portion of the rotating shaft; and the door body attached to the swinging arm at an angle with respect to the swinging arm. A balance weight for adjusting the swing of the door body, an adjustment arm provided on the outside water side of the rotation shaft, and an adjustment arm. A flap gate comprising an adjustment weight for adjusting the rotational moment of the door body and a float provided at a lower inner side of the door body, and a floating center on the inside of the center of gravity of the door body. Is 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

  By the way, many of the existing gates have come to be replaced due to aging, etc., and as described above, in order to avoid labor costs and work hazards, a new automatic opening and closing type has been used instead of the conventional gates. There is a need to install a flap gate.

  However, in the conventional flap gate including the flap gate described in Patent Document 1, as shown in FIG. 9, the door body 4 swings back and forth around the upper rotary shaft 2 to close the opening 91. Due to the structure, a step called a floor step 10 is required at the bottom of the water channel below the opening 91. If there is this floor level difference 10, even if the opening degree (initial opening degree) of the door body 4 is slight, a 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. 10, in an existing water channel that does not have a floor step 10 or a water channel that cannot be provided with a floor step 10 due to hydraulic limitations even if it is newly installed, the water from the inside water side to the outside water side Therefore, it is necessary to increase the initial opening of the door body 4 in order not to hinder the flow of the door.

  Moreover, the balance between the door body and the balance weight 5 is lost due to the strong wind, and the door body 4 collides with the door stop at the outlet end of the water channel, and noise is generated by the impact or the door body 4 is destroyed. There is also a need to increase the initial opening of the door body 4 as much as possible so that the door body 4 does not collide strongly with the door stop.

  However, if the balance weight 5 is simply tilted greatly toward the internal water side in order to increase the initial opening, the balance weight 5 can be connected to the water channel or the like as shown in FIG. It abuts against the structure 9 and cannot be fully opened. Further, as shown in FIG. 12, the initial position of the door body 4 can be reduced by reducing the amount by which the balance weight 5 is inclined toward the inside water side and bringing the center of gravity of the entire door body 4 and the center position of the rotary shaft 2 close to each other. Although it is possible to balance at a position where the angle is increased, in this balanced state, there is a problem that the operation of the door body 4 becomes unstable and is easily influenced by an external force such as wind. Further, when the water level on the river side gradually rises, as shown in FIG. 13, the buoyancy in the opening direction of the door body 4 is larger than the force of closing the door body 4 due to water pressure, and the water level is released. There is also a problem that the backflow cannot be stopped due to the state.

  The present invention has been made in order to solve the above-described needs and problems associated therewith, and provides a flap gate capable of maintaining a stable balance while maintaining a large initial opening degree of the door body. The purpose is to do.

  A flap gate according to the present invention is a flap gate that opens and closes a door body with respect to an opening in a structure such as a lock gate, and a balance weight that adjusts the opening and closing balance of the door body by a main weight and an auxiliary weight. The main weight and the auxiliary weight are integrally rotated in a range in which the door body is opened from the fully closed state to a predetermined inclination angle, and the door body is opened more than the predetermined inclination angle. In this range, the auxiliary weight is separated and only the main weight is rotated.

  As one aspect of the present invention, the main weight includes a main weight support arm installed on a rotating shaft that supports the door body, and a main weight main body supported on the tip of the main weight support arm. And the auxiliary weight is composed of an auxiliary weight support arm installed so as to be rotatable with respect to the rotating shaft, and an auxiliary weight main body supported at the tip of the auxiliary weight support arm, The main weight and the auxiliary weight fit together an auxiliary weight groove portion provided in the auxiliary weight support arm and a main weight fitting portion that can be fitted in the auxiliary weight groove portion provided in the main weight support arm. The auxiliary weight provided on the structure when the door body is opened to the predetermined inclination angle. By stopping the rotation of only the auxiliary weight by the topper, the auxiliary weight groove portion and the main weight fitting portion are separated from each other, and only the main weight is within a range where the door body is opened more than the predetermined inclination angle. May be rotated.

  Further, as one aspect of the present invention, the main weight has a predetermined inclination angle for separating the auxiliary weight, a rotational moment in the closing direction of the center of gravity of the door body, and an opening direction of the center of gravity of the main weight and the auxiliary weight. It may be set to the initial opening degree of the door body which balances with the rotational moment at.

  Further, as one aspect of the present invention, a predetermined inclination angle at which the main weight separates the auxiliary weight is set as an initial opening degree of the door body, and the door body is opened from a fully closed state to the initial opening degree. The rotational moment in the opening direction of the center of gravity, which is the sum of the main weight and the auxiliary weight, is greater than the rotational moment in the closing direction of the center of gravity of the door body, and the door body is opened more than the initial opening degree. In the range, the rotational moment in the opening direction of the center of gravity of only the main weight may be set to be smaller than the rotational moment in the closing direction of the center of gravity of the door body.

  Furthermore, as one aspect of the present invention, the door body is fixed to a rotating shaft via a swing arm, and the main weight support arm is installed to be rotatable with respect to the rotating shaft. The door body and the main weight are fitted with a main weight groove portion provided in the main weight support arm and a door body fitting portion that can be fitted in the main weight groove portion provided in the swing arm. When the door body is opened with only the main weight and opened to a predetermined inclination angle smaller than the full opening, the main weight stopper provided on the structure allows the main weight stopper to be opened. The main weight groove part and the door body fitting part may be separated by stopping the rotation of the weight, and the door body may be rotated without receiving a load due to the balance weight.

  Furthermore, as one aspect of the present invention, a plurality of the auxiliary weights are provided, and when the door body is opened beyond an inclination angle set for each auxiliary weight, the auxiliary weights are sequentially formed. It may be separated from the main weight and rotated by the remaining auxiliary weight and the main weight.

  According to the present invention, it is possible to achieve a stable balance while keeping the initial opening degree of the door body large.

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 view showing the state where the flap gate of the first embodiment is fully closed. In another embodiment, two auxiliary weights are provided, and when the door body is opened beyond the inclination angle set for each auxiliary weight, the auxiliary weights are sequentially separated from the main weight. It is a side view which shows a state. It is a side view which shows the state in which the door body incline more than the initial opening degree (1st inclination angle) in this 1st embodiment. 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. It is a side view which shows the state which the flap gate of this 2nd embodiment opened fully. It is a side view which shows the state which provided the conventional flap gate and provided in the waterway with a level | step difference. It is a side view which shows the state which provided the conventional flap gate and provided in the waterway without a level | step difference. FIG. 10 is a side view showing a state where the balance weight comes into contact with the structure and the door body is not fully opened because the initial opening of the conventional flap gate is increased. It is a side view which shows the state which became the balance which the door body of the conventional flap gate and the balance weight of the whole gravity center position, and the rotating shaft approached, and became unstable. It is a side view which shows the state in which the door body is open | released by buoyancy, although there exists a water flow from the outside water side to the inside water side in the conventional flap gate.

  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 the first embodiment, the flap gate 1A is applied to the water channel without the step 10, but the present invention is not limited to this configuration, and can be applied to the water channel having the floor step 10.

  The flap gate 1A of the first embodiment is for opening and closing the door body 4 with respect to the opening 91 in the structure 9 such as a lock gate. As shown in FIGS. 4 Rotating shaft 2 rotatably supported above, a pair of swinging arms 3 and 3 fixed to the rotating shaft 2 and supported swingably, and the opening 91 of the structure 9 can be opened and closed. The door body 4 includes a balance weight 5 for adjusting the opening / closing balance of the door body 4, and an auxiliary weight stopper 8 for stopping the rotation of the auxiliary weight 7 constituting the balance weight 5. Hereinafter, each configuration will be described in detail.

  As shown in FIGS. 1 and 2, the rotary shaft 2 is for swingably supporting the door body 4 via a pair of swing arms 3 and 3. In the first embodiment, the rotary shaft 2 is formed in a columnar shape, and is supported by a pair of bearings 21 and 21 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 21 and 21 are provided in the vicinity of both ends of the rotating shaft, and are fixed to the structure via the bearing fixture 22.

  As shown in FIGS. 1 and 2, 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 rotating shaft 2 penetrating through the upper end portion. Therefore, the pair of swing arms 3 and 3 are supported so as to be swingable around the rotation axis. A door body 4 is attached to the lower end of each swing arm 3. The swing arm 3 is not limited to a pair, and is appropriately selected according to the length of the swing arm 3, the weight of the door body, and the like.

  The door body 4 is for opening and closing the opening 91 of the structure 9, and as shown in FIGS. 1 and 2, the door 4 is formed to have a dimension 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 axis. Further, a watertight rubber for holding a watertight state between the door fitting provided in the opening 91 and the lower surface of the water channel on the inner water side surface of the door body 4 and buffering an impact when the door body 4 is closed. 41 is provided along the peripheral edge of the door body 4.

  In the first embodiment, the door body 4 and the swing arm 3 are formed as separate bodies and are integrally fixed by welding. However, the present invention is not limited to this configuration, and the door body 4 and the swing arm 3 are integrally formed by bolts or the like. May be fixed, or may be integrally formed by casting or forging.

  Next, the balance weight 5 is for adjusting the opening / closing balance of the door body 4, and is composed of a main weight 6 and an auxiliary weight 7.

  The main weight 6 includes a pair of main weight support arms 61 and 61 installed on the rotary shaft 2, and a main weight main body 62 supported on the tips of the pair of main weight support arms 61 and 61.

  As shown in FIGS. 1 and 2, the pair of main weight support arms 61, 61 are formed in the same shape, and are fixed in the same posture with respect to the rotating shaft 2 penetrating the lower end portion. For this reason, the pair of main weight support arms 61 and 61 are supported so as to be swingable around the rotation shaft 2. Therefore, the main weight 6 and the door body 4 in the first embodiment rotate integrally.

  The main weight support arm 61 is fitted with an auxiliary weight groove portion 73 provided on an auxiliary weight support arm 71 described later, so that the main weight can be integrally rotated with the auxiliary weight 7. A portion 63 is provided. In the first embodiment, as shown in FIGS. 1 and 2, the pair of main weight support arms 61, 61 is constituted by a bar provided so as to penetrate through the substantially vertical center.

  The main weight support arm 61 is not limited to a pair, and is appropriately selected according to the length of the main weight support arm 61, the weight of the main weight main body 62, and the like. Moreover, the shape of the main weight fitting part 63 is not limited to that of a bar, but may be a protrusion or the like as long as it exhibits a predetermined effect.

  The main weight main body 62 is made of metal formed in a cylindrical shape, and the weight can be adjusted by providing a plurality of metal pieces 64 formed in a ring shape at both ends thereof. . In the first embodiment, the weight is adjusted so that the rotational moment due to the center of gravity of the entire main weight 6 is smaller than the rotational moment due to the center of gravity of the door 4 in a range where the door 4 is opened at a predetermined inclination angle or more. Has been. The material and shape of the main weight main body 62 are not particularly limited, and may be any shape, and may be made of concrete, a tank in which water is stored, or the like.

  As shown in FIG. 2, the auxiliary weight 7 includes a pair of auxiliary weight support arms 71, 71 and a pair of auxiliary weight main bodies 72, 72 provided on each of the auxiliary weight support arms 71, 71. In addition, the auxiliary weight 7 rotates integrally with the main weight 6 in a range in which the door body 4 is opened from the closed state to a predetermined inclination angle, and the door body 4 opens more than the predetermined inclination angle. In this range, the main weight 6 is separated.

  Each auxiliary weight support arm 71 is rotatably provided to the rotary shaft 2 by a bearing 75 at the lower end thereof. For this reason, the auxiliary weight support arm 71 can be freely rotated around the rotation shaft 2. Further, an auxiliary weight groove portion 73 that can be fitted into the main weight fitting portion 63 of the main weight support arm 61 is formed at the substantially vertical center of the auxiliary weight support arm 71. By fitting the main weight fitting portion 63 into the auxiliary weight groove portion 73, the auxiliary weight 7 follows the turning operation of the main weight 6 and can rotate integrally. Note that the shapes of the auxiliary weight groove portion 73 and the main weight fitting portion 63 are not particularly limited, and may be appropriately selected.

  The auxiliary weight main body 72 is formed of a metal formed in a columnar shape like the main weight main body 62, and the weight can be adjusted by providing a plurality of metal pieces 74 formed in a ring shape. It is like that. In the first embodiment, in the range in which the door body 4 is opened from the fully closed state to a predetermined inclination angle, the rotational moment due to the center of gravity of the main weight 6 and the auxiliary weight 7 depends on the center of gravity of the door body 4. The weight is adjusted to be greater than the rotational moment. The shape and material of the auxiliary weight main body 72 are not particularly limited, and may be any shape, and may be made of concrete, a tank storing water, or the like.

  Next, the auxiliary weight stopper 8 stops the rotation of the auxiliary weight 7 when the door body 4 is opened to a predetermined inclination angle. As shown in FIG. 1 and FIG. The structure 9 is provided. The inclination angle at this time is hereinafter referred to as “first inclination angle” in the first embodiment.

  The first inclination angle in the first embodiment is a balance between 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 main weight 6 and the auxiliary weight 7. The initial opening of the door body 4 is set. Therefore, the auxiliary weight stopper 8 is engaged with the left and right auxiliary weights 7 and 7 so that the auxiliary weights 7 and 7 do not rotate any more when the door body 4 is tilted to the initial opening degree. It has become.

  It should be noted that the position of the initial opening degree is adjusted so that the rotation moment in the closing direction of the center of gravity of the door body 4 is adjusted so that the rotation moment in the opening direction of the center of gravity of the main weight 6 and the auxiliary weight 7 is equal to or less. The position is not limited to the position where the moments are balanced and can be set arbitrarily. Further, the first inclination angle of the door body 4 that stops the rotation of the auxiliary weight 7 and the position of the initial opening degree of the door body 4 may be different.

  Further, in the structure 9 in the first embodiment, as shown in FIG. 3, the auxiliary weight 7 is separated from the main weight 6 by the reaction caused by the opening and closing of the door body 4, turns to the front side, rotates, and falls. In order to prevent this, an overturn prevention stopper 11 is provided that abuts against the auxiliary weight 7 when the door body 4 is in the fully closed position.

  In the first embodiment, the left and right auxiliary weights 7 and 7 are integrally rotated with the main weight 6 as a pair of weights, and are separated from the main weight 6 at the first inclination angle. However, the present invention is not limited to this, and the separation timing may be shifted. For example, as shown in FIG. 4, the installation positions of the left and right auxiliary weight stoppers 8, 8 may be shifted in the rotational direction to set a predetermined inclination angle away from the main weight 6 for each auxiliary weight 7, 7. . Thus, when the door body 4 is opened beyond the inclination angle set for each auxiliary weight 7, 7, the auxiliary weights 7, 7 are sequentially separated from the main weight 6, and the remaining The auxiliary weight 7 and the main weight 6 are rotated.

  In addition, the 1st inclination angle which stops rotation of the auxiliary | assistant weight 7 is not limited to an initial opening degree, It can be made into arbitrary inclination angles. Further, the number of auxiliary weights 7 and auxiliary weight stoppers 8 is not limited to two, and may be one or three or more.

  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 4 is not affected by the water flow, as shown in FIG. 1, the rotational moment in the closing direction of the center of gravity of the door body 4 and the like, the main weight 6 and the auxiliary weight 7 with respect to the rotating shaft 2. The door body 4 is stationary at a position of a so-called initial opening in which the rotational moment in the opening direction of the center of gravity of the balance weight 5 is balanced. Since the initial opening is greatly opened by the weight of both the main weight 6 and the auxiliary weight 7, the gap between the door body 4 and the water channel bottom can be kept large. Thereby, even if it is a case where the water depth is shallow, a water flow can be drained to the outside water side, without interfering with the door body 4. FIG.

  In addition, when the wind is blown from the outside water side in the state where the initial opening is balanced, the door body 4 tends to be closed by the wind force. However, since the main weight 6 and the auxiliary weight 7 rotate integrally from the initial opening to the fully closed state, the rotational moment in the opening direction of the center of gravity obtained by adding the main weight 6 and the auxiliary weight 7 together. Becomes larger than the rotational moment in the closing direction of the center of gravity of the door body 4, and the door body 4 is not easily closed, and a desired initial opening degree can be maintained.

  Next, as shown in FIG. 5, when water flows from the inner water side to the outer water side, the water level rises and the door body 4 receives water pressure and buoyancy, the door body 4 is inclined by the first moment due to the rotational moment. Inclined more than the angle. At this time, the auxiliary weight stopper 8 provided on the structure 9 abuts on the auxiliary weight 7 to stop the rotation, whereby the main weight fitting portion 63 is separated from the auxiliary weight groove portion 73.

  That is, in the range where the door body 4 is opened beyond the first inclination angle, the auxiliary weight 7 is separated and only the main weight 6 rotates together with the door body 4. Since the door body 4 receives the rotational moment in the opening direction of only the main weight 6, the rotational moment in the opening direction becomes smaller than that in the case of the entire balance weight 5. Therefore, since the rotation angle of the main weight 6 in the opening direction becomes small, the main weight 6 can be prevented from coming into contact with the structure 9. Further, even when the water level on the river side gradually rises, the rotational moment in the closing direction by the door body 4 is large, and it becomes difficult to be released by the buoyancy in the opening direction of the door body 4, and the backflow is stopped. It becomes easy.

  When the amount of water flowing from the inside water side to the outside water side is reduced and the door body 4 is closed to the initial opening, the main weight fitting portion 63 is fitted into the auxiliary weight groove portion 73 and the main weight 6 and the auxiliary weight are closed. The weight 7 rotates together again.

  Next, when water flows from the outside water side to the inside water side and presses the door body 4, the door body 4 rotates in the closing direction, and the inclination angle becomes smaller than the initial opening. The main weight 6 and the auxiliary weight 7 rotate integrally from the initial opening degree (first inclination angle) to the range where the door body 4 is fully closed. Therefore, the door body 4 is slowly rotated in the closing direction by the load applied by the auxiliary weight 7 as compared with the case of the main weight 6 alone. As shown in FIG. 3, the door body 4 can be fully closed.

According to the flap gate 1A of the first embodiment as described above, the following effects can be obtained.
1. By providing the auxiliary weight 7 together with the main weight 6 as the balance weight 5, the initial opening degree of the door body 4 can be increased, so that a sufficiently large opening can be secured even in a lock gate or the like having no floor step 10 and water can flow. be able to.
2. Since the auxiliary weight 7 is added to the main weight 6 as the balance weight 5, the force for maintaining the initial opening degree is strong, and the door body 4 can be prevented from colliding with the opening 91 due to a gust of wind or high waves.
3. Since the weight of the balance weight 5 can be automatically changed according to the opening / closing position of the door body 4, the opening / closing speed and opening / closing force of the door body 4 can be adjusted as appropriate, and the opening / closing operation can be performed smoothly. it can.

  Next, a second embodiment of the flap gate according to the present invention will be described with reference to the drawings. 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 feature of the flap gate 1B of the second embodiment is that the main weight 6 is separated from the door body 4 when the door body 4 is opened at a predetermined inclination angle close to full opening in the configuration of the first embodiment. It exists in the point rotated only by the said door body 4. FIG. Specifically, the pair of main weight support arms 61, 61 in the flap gate 1B of the second embodiment is installed so as to be rotatable with respect to the rotary shaft 2 by a bearing 66 at the lower end thereof. As shown in FIGS. 6 and 7, the swing arm 3 and the main weight support arms 61 and 61 are provided with a main weight groove portion 65 that can be fitted to a door body fitting portion 31 described later.

  Further, as shown in FIG. 7, as shown in FIG. 7, rods provided so as to be installed on the swing arms 3, 3 on the swing arms 3, 3 supporting the door body 4 in the second embodiment. The door body fitting part 31 which consists of is formed in the dimension which can be fitted with the said main weight groove part 65. As shown in FIG. In addition, the shape of the door body fitting part 31 and the main weight groove part 65 is not specifically limited, You may select suitably.

  Furthermore, as shown in FIG. 6, the structure 9 in the second embodiment is provided with a main weight stopper 12 for stopping the rotation with the main weight 6 at a predetermined opening degree. The main weight stopper 12 is in contact with the main weight 6 when the door body 4 is rotated only with the main weight 6 and the door body 4 is opened to a predetermined inclination angle smaller than the fully open position. Support so as not to rotate. The inclination angle of the door body 4 at this time is referred to as a second inclination angle in the second embodiment. Therefore, when the door body 4 is opened to the second inclination angle, the door body fitting portion 31 is separated from the main weight groove portion 65. The position at which the second inclination angle is set is not particularly limited, but in the second embodiment, it is preferably provided before the door body 4 is fully opened, whereby the main weight 6 is structured. Contact with the object 9 can be prevented.

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

  In the flap gate 1 </ b> B of the second embodiment, the main body 6 and the auxiliary weight 7 rotate together in a range where the door body 4 opens from the fully closed position to the first inclination angle (initial opening). Next, in a range where the door body 4 opens from the first inclination angle (initial opening degree) to the second inclination angle, the auxiliary weight 7 is separated, and the door body 4 is rotated by the weight of the main weight 6 alone. Move. Therefore, from the fully closed position to the second inclination angle, the door body fitting portion 31 is in a state of being fitted in the main weight groove portion 65, and the door body 4 rotates integrally with the main weight 6.

  Next, when the door body 4 rotates in the range from the second inclination angle to the fully open position, as shown in FIG. 8, the main weight stopper 12 contacts the main weight 6 to stop the rotation, and the door The body fitting portion 31 is separated from the main weight groove portion 65. Therefore, even if the door body 4 is opened to a second inclination angle or more by water pressure due to drainage from the inside water side, the balance weight 5 is not overloaded by water pressure.

  As described above, according to the flap gate 1B of the second embodiment, the main weight 6 is separated from the door body 4 when the door body 4 is opened beyond the second inclination angle that is before the door body 4 is fully opened. The main weight 6 is held so as not to contact the structure 9 and can be fully opened only by the door body 4.

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

  For example, although not shown, a float that generates arbitrary buoyancy in the door body 4 may be provided to adjust the buoyancy applied to the door body 4.

DESCRIPTION OF SYMBOLS 1A, 1B Flap gate 2 Rotating shaft 3 Swing arm 4 Door body 5 Balance weight 6 Main weight 7 Auxiliary weight 8 Auxiliary weight stopper 9 Structure 10 Laying step 11 Fall prevention stopper 12 Main weight stopper 21 Bearing 22 Bearing fixture 31 Door Body fitting portion 41 Watertight rubber 61 Main weight support arm 62 Main weight main body 63 Main weight fitting portion 64 Metal piece 65 Main weight groove portion 66 Bearing 71 Auxiliary weight support arm 72 Auxiliary weight main body 73 Auxiliary weight groove portion 74 Metal piece 75 Bearing 91 Aperture

Claims (6)

A flap gate that opens and closes a door body with respect to an opening in a structure such as Xiamen,
A balance weight for adjusting the opening / closing balance of the door body is constituted by a main weight and an auxiliary weight, and the main weight and the auxiliary weight are integrated in a range in which the door body is opened from a fully closed state to a predetermined inclination angle. The flap gate is configured such that only the main weight rotates while separating the auxiliary weight within a range in which the door body is opened at an angle equal to or greater than the predetermined inclination angle. The main weight is composed of a main weight support arm that is installed on a rotating shaft that supports the door body, and a main weight main body that is supported on the tip of the main weight support arm,
The auxiliary weight is composed of an auxiliary weight support arm that is installed so as to be rotatable with respect to the rotation shaft, and an auxiliary weight main body that is supported at the tip of the auxiliary weight support arm,
The main weight and the auxiliary weight are fitted with an auxiliary weight groove portion provided in the auxiliary weight support arm and a main weight fitting portion that can be fitted in the auxiliary weight groove portion provided in the main weight support arm. It becomes possible to rotate integrally by combining,
When the door body is opened to the predetermined inclination angle, the auxiliary weight groove portion and the main weight fitting portion are separated by stopping the rotation of only the auxiliary weight by the auxiliary weight stopper provided in the structure. The flap gate according to claim 1, wherein only the main weight rotates in a range in which the door body is opened beyond the predetermined inclination angle.   As the predetermined inclination angle at which the main weight separates the auxiliary weight, the rotational moment in the closing direction of the center of gravity of the door body and the rotational moment in the opening direction of the center of gravity of the main weight and the auxiliary weight balance and stop. The flap gate according to claim 1 or 2, wherein the initial opening degree of the door body is set.   A predetermined inclination angle at which the main weight separates the auxiliary weight is set as an initial opening of the door body, and in a range where the door body is opened from a fully closed state to the initial opening, the main weight and the In the range where the rotational moment in the opening direction of the center of gravity summing up the auxiliary weights is greater than the rotational moment in the closing direction of the center of gravity of the door body, the center of gravity of only the main weight is within the range where the door body is opened beyond the initial opening. The flap gate according to claim 1 or 2, wherein a rotational moment in the opening direction is set to be smaller than a rotational moment in the closing direction of the center of gravity of the door body. The door body is fixed to a rotating shaft via a swing arm, and the main weight support arm is installed to be rotatable with respect to the rotating shaft,
The said door body and the said main weight fit together the main weight groove part provided in the said main weight support arm, and the door body fitting part which can be fitted in the said main weight groove part provided in the said rocking | swiveling arm. It becomes possible to rotate integrally,
When the door body is opened only with the main weight and opened to a predetermined inclination angle smaller than the full opening, the main weight groove portion is configured to stop the rotation of the main weight by a main weight stopper provided in the structure. The flap gate according to any one of claims 1 to 4, wherein the door body fitting portion is separated and the door body rotates without receiving a load due to the balance weight.   A plurality of the auxiliary weights are provided, and when the door body is opened beyond an inclination angle set for each auxiliary weight, the auxiliary weights are sequentially separated from the main weight, and the remaining The flap gate according to any one of claims 1 to 5, wherein the flap gate is rotated by the auxiliary weight and the main weight.

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