JP2011099266A - Gate for preventing backflow - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a buoyant gate for preventing backflow, which can be installed even in a channel of a four-side watertight structure, hardly causes a wire to come off a winding machine drum due to the loosening of the wire, and can surely prevent an unexpected backflow. <P>SOLUTION: The gate 10 for preventing backflow includes: a door body 13 which is arranged on the bottom of the channel in such a manner as to be raised/brought down via a support portion 12 and which produces buoyancy in water; a main wire 14 which has a leading end side connected to the door body 13; and the winding machine 16 which has a main drum 15 for winding/unwinding the base end side of the main wire 14. The backflow prevention gate 10 further includes an urging means 17 which winds the main wire 14 along with the rising motion of the door body 13, and which imparts, to the main drum 15, a winding force for keeping the door body 13 after rising in a rising attitude. The urging means 17 includes an auxiliary drum 25 which interlocks with the rotating shaft 21 of the main drum 15, an auxiliary wire 24 which is wound around the auxiliary drum 25, and a weight 26 which is annexed to the auxiliary wire 24. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a buoyancy-type backflow prevention gate having a function of preventing a backflow of water from a river or the ocean side by performing ups and downs according to a water level difference between the river side or the ocean side and a water channel side.

  Conventionally, in Xiamen and Xiamen as river management facilities, there is an example in which a buoyancy type backflow prevention gate is installed in order to prevent a backflow when the river is increased due to heavy rain. The buoyancy-type backflow prevention gate has a structure in which a door body that generates buoyancy in water is pivotally supported around a horizontal axis on the bottom surface of a flow path for flowing water in a certain direction. The buoyancy-type backflow prevention gate is sometimes used as a management facility that prevents seawater from flowing back to the river side when the tide level rises due to high tide or the like.

  Since the water level on the upstream side of the flow path is high during normal times, the door body of the buoyancy type backflow prevention gate is in a state of lying down almost horizontally to the downstream side, and the water gets over the door body and flows downstream from the upstream side of the flow path. It flows in a certain direction toward the side.

  On the other hand, when the river increases due to heavy rain and the water level on the downstream side of the flow path rises, the door body stands up on the upstream side due to the buoyancy of the water, so in the flow path from the downstream side to the upstream side. It is possible to prevent a backward flow from occurring.

  Moreover, in the buoyancy type backflow prevention gate, a wire type hoisting machine for raising and lowering the door body for the purpose of management or water storage may be installed. In the backflow prevention gate where the wire hoisting machine is installed, due to the undulation action of the door body due to buoyancy, the wire may loosen, the wire may come off from the drum of the hoisting machine, and the subsequent hoisting operation may become impossible .

  In order to solve such a problem, a base end portion of an arm as a weight for applying tension to a wire for winding is rotatably attached to a door body, and the wire is attached to the distal end portion of the arm. (For example, refer to Patent Document 1).

  In the overturning gate described in Patent Document 1, when the door body that has been lying down horizontally is in a standing state as the water level rises, tension is applied to the wire by the arm as a weight. Will not loosen and come off the hoist.

Japanese Patent No. 2964046

  In the case of the overturning gate described in Patent Document 1, the arm portion cannot be wound up by a hoist when the door is raised by winding up the wire, which corresponds to the length of this arm compared to the case without an arm. It is necessary to install the hoisting machine at a higher position. For this reason, when the flow passage side wall where the hoisting machine is installed is low, the foundation structure for installing the hoisting machine must be formed high, so the construction materials tend to increase and the workability is not good. .

  In addition, in the case of the overturn gate described in Patent Document 1, the upper surface of the flow path must be opened in order to secure the operating area of the arm when the door body is raised and lowered, so that it is installed in the flow path of the four-way watertight structure Is extremely difficult.

  On the other hand, the door body of the overturning gate described in Patent Document 1 has a function to undulate in response to changes in the water level and tide level on the downstream side. The undulations are repeated during the full closure, and the door body and its peripheral members may be damaged. In addition, in order to prevent a reverse flow accompanying a rise in tide due to a tsunami or a typhoon at the overturning gate, it is necessary to operate the hoisting machine in advance to wind up the wire and to erect the door body.

  The problem to be solved by the present invention can be installed in a flow path of a four-way watertight structure, and it is difficult for the wire to be detached from the hoisting drum due to the loosening of the wire, and it is possible to reliably prevent sudden backflow. An object of the present invention is to provide a buoyancy-type backflow prevention gate that can be used.

  The backflow prevention gate of the present invention includes a door body that can be raised and lowered at the bottom of the flow path and generates buoyancy in water, a main wire having a distal end connected to the door body, and a proximal end side of the main wire. A hoisting machine having a main drum that feeds out, and winds up the main wire as the door body rises, and has a winding force for keeping the door body in the standing posture after the standing action An urging means for applying to the main drum is provided.

  With such a configuration, when the door body rises in accordance with the rise of the water level and the tide level on the downstream side of the flow path, and the pulling force of the main wire is slackened with the standing action, the urging means As a result, the main wire is immediately wound around the main drum, so that the main wire is not loosened, and the main wire can be prevented from being detached from the main drum due to the loosening of the main wire. In addition, the door body after standing by buoyancy due to tide rise due to tsunami, typhoon, etc. is supported by the main wire wound around the main drum by the urging force of the urging means, and is kept in the standing posture immediately after the standing operation. Therefore, sudden backflow can be reliably prevented.

  The leading end of the main wire is locked to the door, but when the main wire is wound up by the main drum of the hoisting machine and the door is raised, the member or hoisting machine and the door project higher than the door Since there is no member that does not fit between the body, it can also be installed in a flow path with a four-way watertight structure.

  Here, as the urging means, a secondary drum that rotates in conjunction with the rotation shaft of the primary drum, a secondary wire that is wound around the secondary drum with its base end side locked, and a secondary drum It is desirable to provide a weight attached to the end portion side of the suspended subwire.

  With such a configuration, the main drum and the sub drum that rotate in conjunction with each other via the rotating shaft, the main wire wound around the main drum, the sub wire wound around the sub drum, and the main wire A wheel shaft mechanism is formed by the door body for applying the pulling force in the feeding direction and the weight for applying the pulling force in the feeding direction to the sub drum, and the main wire is always in a state in which the pulling force is applied.

  Therefore, when the pulling force of the main wire is loosened with the standing motion of the door body, the main wire is immediately wound around the main drum by the action of the urging means described above, and does not loosen. The function of preventing the detachment of the main wire from the main drum is improved.

  On the other hand, it is preferable that the weight is formed of a plurality of unit weights that can be attached to and detached from the sub wire. With such a configuration, the weight of the entire weight is changed by changing the number of unit weights attached to the sub-wire, so that the main wire is connected to the main wire via the sub-wire, the sub-drum, the rotating shaft, and the main drum. Since the applied tensile force can be increased or decreased, it is possible to apply a tensile force suitable for the door at the construction site to the main wire. Since the weight having the required weight can be disassembled into a plurality of unit weights, the transportation to the construction site and the assembly work are facilitated.

  According to the present invention, a buoyancy type that can be installed in a flow path of a four-way watertight structure, is less likely to cause wire detachment from the hoisting drum due to loosening of the wire, and can reliably prevent sudden backflow. The backflow prevention gate can be provided.

It is a front view which shows the backflow prevention gate which is embodiment of this invention. It is a top view of the backflow prevention gate shown in FIG. It is sectional drawing in the AA of FIG. It is an enlarged view near the hoisting machine of the backflow prevention gate shown in FIG. FIG. 3 is an enlarged view of the vicinity of the hoisting machine of the backflow prevention gate shown in FIG. 2.

  As shown in FIGS. 1 to 3, a buoyancy-type backflow prevention gate 10 according to an embodiment of the present invention is disposed on a bottom 11 b of a flow path 11 via a support portion 12 so as to be able to undulate, and generates a buoyancy in water. A body 13, a main wire 14 having a distal end connected to the door body 13, and a hoisting machine 16 having a main drum 15 that winds and unwinds the proximal end side of the main wire 14. A biasing means 17 is provided that winds the main wire 14 along with the operation and applies a winding force to the main drum 15 to keep the door body 13 in a standing posture after standing. 2 and 3, an arrow X indicates a normal water flow direction in the flow path 11, and an arrow Y indicates a reverse flow direction.

  The front end side of the main wire 14 is locked to a locking portion 18 that protrudes from one end of the front edge portion 13a of the door body 13 (the end near the one side wall 11a of the flow path 11). . The main wire 14 positioned between the locking portion 18 and the main drum 15 of the hoist 16 is hung on a pulley 20 that is rotatably supported by a flow channel housing 19 above the door body 13. . The pulley 20 prevents the leading end side of the main wire 14 from shaking due to the locking portion 18 that moves by the raising and lowering operation of the door body 13.

  As shown in FIG. 4, in the present embodiment, as the urging means 17, the auxiliary drum 25 interlocked with the rotary shaft 21 of the main drum 15 and the base end side of the auxiliary drum 25 are locked and wound. A sub wire 24 and a weight 26 attached to the tip end side of the sub wire 24 suspended from the sub drum 25 are provided. The sub drum 25 shares the rotating shaft 21 with the main drum 15. The weight 26 is accommodated in a vertically long working chamber 23 formed in a vertical direction along the flow path housing 19 so as to be lifted and lowered in a state of being partitioned from the periphery.

  The weight 26 is formed of a plurality of unit weights 26 a that are detachably attached to a holder 27 that is locked to the distal end portion of the sub-wire 24. The holder 27 has a round bar-shaped main body portion 27a that is suspended coaxially with the sub wire 24, and a flange-shaped stopper 27b formed at the lower end thereof. As shown in FIG. 5, the disk-shaped unit weight 26a has a through hole 26b at the center thereof and a notch 26c in the radial direction from the through hole 26b.

  In the backflow prevention gate 10, the main drum 15 and the sub drum 25 that rotate in conjunction with each other via the rotating shaft 21, and the main wire 14 wound around the main drum 15 and the sub wire 24 wound around the sub drum 25. And the weight 13 that applies the tensile force in the feeding direction to the sub drum 25 and the door body 13 that applies the tensile force in the feeding direction to the main wire 14, and the main wire 14 always has a tensile force. It has been granted.

  Further, in the backflow prevention gate 10, as shown in FIG. 1, a tensile force P <b> 1 in the winding direction applied to the main wire 14 by the weight 26 via the sub drum 25, the rotating shaft 21 and the main drum 15, The weight of the weight 26 is set so that the pulling force P2 in the feeding direction applied to the main wire 14 by the door body 13 is equal. Therefore, when the door body 13 undulates within the undulation range 28 (see FIG. 3), the weight 26 moves up and down accordingly, and balance is achieved based on the principle of the wheel shaft. Even if it stops in the throat inclination posture, the main wire 14 does not loosen, and the door body 13 is kept stationary.

  Next, the function of the backflow prevention gate 10 will be described with reference to FIGS. Since the water level on the upstream side of the flow path 11 is high in normal times, as shown in FIG. 3, the door body 13 of the backflow prevention gate 10 is in a state of lying down almost horizontally to the downstream side (the state of the door body 13x). The water flows over the door body 13x in the direction of the arrow X from the upstream side of the flow path 11 toward the downstream side. At this time, the wire 14 is shaped like a reverse letter by the drum 15 of the hoist 16, the pulley 20, and the locking portion 18 of the door body 13.

  Here, when the water level or the tide level on the downstream side of the flow path 11 rises, the door body 13 rises due to the buoyancy of water, but when the pulling force of the main wire 14 is loosened due to the rising action, the biasing means 17, the main wire 14 is immediately wound around the main drum 15, so that the main wire 14 is not loosened, and the main wire 14 is prevented from being detached from the main drum 15 due to the loosening of the main wire 14. can do.

  Further, the door body 13 after standing by buoyancy accompanying tide rise due to a tsunami or typhoon is supported by the main wire 14 wound around the main drum 15 by the urging force of the urging means 17, and is tilted immediately after the erection operation. Since the posture is maintained, even a sudden reverse flow in the arrow Y direction can be reliably prevented.

  The front end side of the main wire 14 is locked to the locking portion 18 of the door body 13, but when the main wire 14 is wound up by the main drum 15 of the hoist 16 and the door body 13 is raised, the door body Since there is no member that protrudes higher than 13 or a member that does not fit between the hoist 16 and the door body 13, it can be installed in the flow path 11 having a four-way watertight structure.

  Further, when the pulling force of the main wire 14 is loosened as the door body 13 is raised, the main wire 14 is immediately wound around the main drum 15 by the action of the biasing means 17 described above, and does not loosen. The function of preventing the detachment of the main wire 14 from the main drum 15 of the hoist 16 is excellent.

  Furthermore, since the weight 26 is formed of a plurality of unit weights 26a that can be attached to and detached from the holder 27 that is locked to the distal end side of the sub wire 24, the number of unit weights 26a that are attached to the holder 27 can be reduced. It is possible to change the weight of the entire weight 26 to increase or decrease the winding direction tensile force P <b> 1 applied to the main wire 14 via the auxiliary wire 24, the auxiliary drum 25, the rotating shaft 21 and the main drum 15. Therefore, the tensile force P1 suitable for the door 13 at the construction site can be applied to the main wire 14. In addition, since the weight 26 having a required weight can be disassembled into a plurality of unit weights 26a, it is easy to transport and assemble to the construction site.

  The backflow prevention gate of the present invention can be widely used as a river management facility or a coastal tide prevention facility.

DESCRIPTION OF SYMBOLS 10 Backflow prevention gate 11 Flow path 11a Side wall 11b Bottom part 12 Bearing part 13 Door body 13a Front edge part 14 Main wire 15 Main drum 16 Hoisting machine 17 Energizing means 18 Locking part 19 Channel housing 20 Pulley 21 Rotating shaft 23 Actuation Chamber 24 Sub wire 25 Sub drum 26 Weight 26a Unit weight 26b Through hole 26c Notch portion 27 Holder 27a Main body portion 27b Stopper

Claims (3)

  A winding having a door body that can be raised and lowered at the bottom of the flow path and generates buoyancy in water, a main wire having a distal end connected to the door body, and a main drum that winds and unwinds the proximal end side of the main wire And an urging force that winds the main wire in accordance with the standing motion of the door body and applies a winding force to the main drum to keep the door body in the standing posture after the standing motion. A backflow prevention gate characterized by providing means.   As the urging means, a sub drum interlocked with the rotation shaft of the main drum, a sub wire wound around the sub drum with its base end side locked, and the sub wire suspended from the sub drum The backflow prevention gate according to claim 1, further comprising a weight attached to a tip end side of the backflow prevention gate.   3. The backflow prevention gate according to claim 2, wherein the weight is formed of a plurality of unit weights that can be attached to and detached from the auxiliary wire.

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