JP6625911B2 - Flap gate and gate equipment - Google Patents

Description

  The present invention provides a flap gate that opens a water channel and allows flowing water to flow downstream when the upstream water level rises, and maintains a state where flowing water does not flow to the upstream side when the downstream water level rises. It relates to gate facilities installed at places and locations.

  For example, when installing a tsunami / storm surge breakwater on a riverbed, it is necessary to prevent the surge waves during a storm surge or tsunami from flowing to the upstream side of the river, but to communicate to the downstream side of the river during floods. It is.

  Therefore, it is desirable that the tsunami and storm surge breakwater to be installed be movable. However, when installed on a riverbed where sedimentation and / or sediment transport due to storm surges and floods accumulate, or where sediment / sand, driftwood, rubble, etc., which have been washed away during the tsunami, are deposited, these deposits may cause tsunami / storm surge breakwaters. It becomes a factor that hinders the operation.

  For example, in a falling gate by its own weight, the gate will fall on top of the deposit. Therefore, not only an unexpected external force acts on the gate, but also the riverbed may not be able to be closed due to the sediment.

  Further, in a flap gate in which the distal end side stands up and swings with the base end side as a fulcrum as disclosed in Patent Literature 1, drifting sand, drifting sand, driftwood, debris, and the like accumulate on the gate body in a normal state of the laid-down state.

  These deposits have a thickness of, for example, 2 m or more depending on the area where they are installed. Therefore, if the gate body cannot be erected due to the sediment when the tsunami wave comes, it is impossible to prevent the wave from flowing to the upstream side of the river.

  In order to cope with this problem, it is conceivable to provide an upright mechanism for the gate body. However, a large-scale erecting mechanism is required to erect a gate body in a state where drift sand, quicksand, driftwood, rubble, and the like are accumulated. In addition, it is necessary to maintain and maintain the accumulated drifting sand, drift sand, driftwood, rubble, etc., from entering the standing mechanism.

  As another method, there is a flap gate in which the lower part of the gate body is swingably suspended in the upstream and downstream directions of the river. As shown in FIG. 7, the flap gate has a structure in which a gate body 1 is rotatably supported on a curtain wall 2 by a swing shaft 1a attached to an upper end portion.

  In the case of the flap gate, for example, when a tsunami wave is approaching, the upstream sway of the gate body 1 can be prevented, and the storm wave 4 and the sediment 5 such as sand can be prevented from flowing to the upstream side. . The prevention of the swing of the gate body 1 in the upstream direction is performed by a stopper 3 installed on the upstream side of the gate body 1 as shown in FIG.

  However, as shown in FIG. 7B, the gate body 1 cannot swing in the downstream direction due to deposits 5 such as sand. Therefore, the flood 6 flowing from the upstream side to the downstream side at the time of a tsunami withdrawal or at the time of guerrilla heavy rain cannot be communicated with the downstream side.

JP 2012-241449 A

  The problem to be solved by the present invention is that when a flap gate is installed in a place where drift sand, quicksand, driftwood, rubble, etc. are deposited or in a waterway, flowing water from the upstream side to the downstream side cannot be communicated.

  The present invention, even if a flap gate is installed in a place or a waterway where drift sand, drift sand, driftwood, rubble, etc. are deposited, it prevents flowing water and the sediment from flowing to the upstream side, and from the upstream side to the downstream side. The purpose is to enable the flow of flowing water.

The flap gate of the present invention
The upper end is rotatably supported by a swing shaft arranged so that the cross-sectional direction of the waterway is the longitudinal direction, and the lower part is free to swing in the upstream and downstream directions of the waterway. A gate body that lowers swings downstream to open a closed water channel, and maintains a closed state of the water channel by a stopper provided on the upstream side when the downstream water level rises;
A box provided on the downstream surface of the gate body so as to protrude downstream,
The box body has a bottom surface formed in a convex curved surface centered on the swing axis side from a lower end portion of the gate main body when viewed from a longitudinal sectional direction of the water channel, and a convex curved surface of the bottom surface from the swing axis. The most main feature is that the bottom surface is formed such that the distance to the surface gradually increases as the distance from the downstream surface of the gate body to the downstream side increases .

  In the flap gate of the present invention, when the water level on the downstream side rises and water flows from the downstream side to the upstream side, the gate body is prevented from swinging in the upstream direction, and the closed state of the water channel is maintained. Therefore, it is possible to prevent the flow of water from the downstream side or the accumulation of deposits such as sand deposited on the downstream side to the upstream side.

  On the other hand, when the water level on the upstream side rises, the bottom surface of the box body has a convex curved surface, so that the gate body can swing in the downstream direction even if there is a deposit such as sand on the downstream side. Therefore, flowing water from the upstream side can be communicated to the downstream side.

  In the flap gate according to the present invention, it is preferable that the distance from the swing axis to the convex curved surface of the bottom surface of the box is gradually increased as the distance from the downstream surface of the gate body to the downstream increases. With such a convex curved surface, when the gate body swings in the downstream direction, the bottom surface of the box separates from the surface of the deposit immediately after swinging, and the gate body can smoothly swing in the downstream direction.

  The flap gate of the present invention is installed, for example, on a riverbed or as a child gate in the main body opening of a parent gate capable of blocking a waterway. This is the gate equipment of the present invention.

  According to the present invention, when the water level on the downstream side rises and water flows from the downstream side to the upstream side, the gate body is prevented from swinging in the upstream direction and the closed state of the water channel is maintained. Therefore, it is possible to prevent the flow of water from the downstream side and the accumulation of the deposits such as sand deposited on the downstream side to the upstream side.

  In addition, by making the bottom surface of the box a convexly curved surface, when the upstream water level rises, the gate body can swing in the downstream direction even if there is a deposit such as sand on the downstream side. Therefore, the flowing water from the upstream side can be communicated to the downstream side to secure a flowing water area.

In the side view of the gate equipment of the present invention in which the flap gate of the present invention is installed on a riverbed, (a) shows a normal time, (b) shows a tsunami wave, and (c) shows a flood time. (A) is a perspective view of the gate equipment of the present invention shown in FIG. 1 as viewed from the downstream side of the river, and (b) is an enlarged cross-sectional view of a portion where the gate body is attached to the curtain wall. FIG. 2 is a front view of the gate facility of the present invention shown in FIG. 1 as viewed from the downstream side of a river, where (a) shows a case where there is no sediment on the downstream side, and (b) shows a case where there is sediment on the downstream side. I have. (A) is a side view when deposits are deposited on the downstream side surface of the box of the gate equipment of the present invention, and (b) is a diagram illustrating the accumulation of deposits on the downstream side surface of the box of the gate equipment of the present invention. It is a side view which showed the corresponding example. It is the schematic which looked at the gate equipment of this invention which made the child gate of the raising / lowering type parent-child gate the flap gate of this invention from the front. It is the schematic which looked at the gate equipment of this invention which set the child gate of the horizontal pull-type parent-child gate as the flap gate of this invention from above. A side view of a case where a conventional flap gate without a box is applied to a place where sand or the like is deposited, (a) shows a time when a tsunami is approaching, (b) shows a time when a tsunami is drawn or a flood. I have.

  Even if a flap gate is installed in a place or in a channel where drift sand, quicksand, driftwood, rubble, etc. are deposited, the channel is opened when the upstream water level rises, while the channel is closed when the downstream water level rises. The aim is to maintain.

  To achieve the above object, a box is provided on the downstream surface of the gate body so as to protrude downstream, and the bottom surface of the box is moved from the lower end of the gate body to the swing shaft supporting the upper end of the gate body. This is realized by forming a convex curved surface centered on.

An example of an embodiment for carrying out the present invention will be described in detail with reference to FIGS.
11 is a flap gate of the present invention. In the flap gate 11 of the present invention, for example, the curtain wall 14 provided between the gate posts 13 rotatably supports the upper end portion 12a of the gate body 12, and the lower portion 12c is swingable in the upstream and downstream directions of the river. .

  In the example shown in FIG. 2, the gate body 12 is supported by the curtain wall 14 by linking a swing shaft 12 b attached to both sides of an upper end portion 12 a of the gate body 12 and a support shaft 14 a attached to the curtain wall 14. It is done by connecting at 20. By supporting the gate body 12 via the link 20 in this manner, accurate watertightness can be ensured.

  In FIG. 2, reference numeral 15 denotes a bearing bracket attached to the curtain wall 14. Reference numeral 19a denotes a bush provided at a portion of the bearing bracket 15 through which the support shaft 14a is inserted. Reference numeral 19b denotes a bush attached to both ends of the swing shaft 12b of the gate body 12. Reference numeral 22a denotes end plates attached to both ends of the support shaft 14a to prevent the support shaft 14a from coming off. Reference numeral 22b denotes a plate that inserts both ends of the swing shaft 12b, to which the bush 19b is attached, into an insertion hole provided in the upper end portion 12a of the gate body 12, and then closes the insertion hole.

  In the gate facility 10 of the present invention, the flap gate 11 is installed on a riverbed such that the lower end of the gate body 12 is located above the level of the river.

  At that time, a stopper 17 is installed on the upstream side of the lower part 12c of the gate main body 12, so that the lower part 12c of the gate main body 12 is prevented from swinging to the upstream side of the river so that it can swing only to the downstream side. .

  In the present invention, the box body 16 is attached to the downstream surface 12d of the gate body 12 so as to protrude downstream. The box body 16 has, for example, a convex curved surface centered on the rocking shaft 12b as viewed from a position on a straight line parallel to the direction in which the river flows.

  In the embodiment shown in FIGS. 1 to 3, the bottom shape of the box body 16 is a circular arc, and the upstream end 16 d of the river on the bottom surface 16 a coincides with the lower end of the downstream surface 12 d of the gate body 12. Installed. As shown in FIG. 1A, for example, as shown in FIG. 1A, the bottom 16a of the box 16 prevents the downstream end 16b of the river from being buried in the sediment 5.

  The box body 16 is filled with, for example, a buoyant body, so that a moment in a direction of swinging downstream due to water pressure acts on the gate body 12 to which the box body 16 is attached in a flood.

  Incidentally, the turning radius r1 of the gate body 12 is determined by the height of a tsunami or storm surge to be protected. On the other hand, the radius r2 of the bottom surface 16a of the box 16 can be adjusted in design. In the case of the present embodiment, as shown in FIG. 1A, the distance from the center of the swing shaft 12b to the tip of the gate body 12 is the rotation radius r1. When the gate body 12 is in the closed state, the distance from one point on a line extending vertically through the swing shaft 12b and the support shaft 14a to the bottom surface 16a of the box 16 is the radius r2.

  In the embodiment shown in FIGS. 1 to 3, the radius r2 is larger than the rotation radius r1, and the distance from the swing axis 12b to the bottom surface 16a of the box 16 is smaller than the downstream surface 12d of the gate body 12 from the downstream surface 12d. The longer the distance, the longer it is.

  In this way, when the gate body 12 swings in the downstream direction of the river, the bottom surface 16a of the box body 16 separates from the surface of the sediment 5 immediately after the swing, as shown in FIG. And the swing of the gate body 12 can be performed smoothly.

  In the present invention, since the box 16 is attached to the downstream surface 12d of the gate body 12, the position of the center of gravity of the gate body 12 is shifted toward the box 16 side. Therefore, a moment in the direction of pressing against the gate pillar 13, the curtain wall 14, and the stopper 17 always acts on the gate body 12, and the watertightness of the gate body 12 is further improved.

  In FIGS. 1 to 3, reference numeral 18 denotes a watertight rubber arranged on the downstream surface of the gate 13, the curtain wall 14, and the stopper 17. The watertight rubber 18 keeps the upstream surface 12 e of the gate body 12 and the downstream surfaces of the gate post 13, the curtain wall 14, and the stopper 17 in a watertight state.

  In the gate facility 10 of the present invention having the above-described configuration, for example, when a tsunami occurs and the tide 4 comes in, as shown in FIG. 1B, the gate body 12 is held vertically in a normal state by the stopper 17. To maintain the state. Accordingly, it is possible to prevent the approaching wave 4 and the sediment 5 from flowing to the upstream side.

  On the other hand, with respect to the flood 6 flowing from the upstream side to the downstream side due to the tsunami and the guerrilla downpour, as shown in FIG. Even if the deposit 5 exists on the side, the gate body 12 can swing in the downstream direction. Therefore, the flood 6 can be communicated to the downstream side to secure a flowing water area.

  The present invention is not limited to the above examples, and it goes without saying that the embodiments may be appropriately modified within the scope of the technical idea described in each claim.

  For example, the thickness of the sediment 5 such as drifting sand, quicksand and rubble varies depending on the river to be installed. When the thickness of the deposit 5 reaches several meters, the deposit 5 accumulates on the downstream side surface 16c of the gate body 12 and the box body 16 as shown in FIG. In this case, it is conceivable that the swing of the gate main body 12 in the downstream direction of the river is hindered.

  Therefore, when the sediment 5 is installed on a riverbed having a thickness of several meters, the curtain wall 2 covers the gate body 12 and the downstream side surface 16c of the box 16 as shown in FIG. The body 21 may be installed.

  Further, the gate facility 10 of the present invention is not limited to being installed on a riverbed as the tsunami / storm surge breakwater described above, but may be installed in a waterway on which sand or the like is deposited.

  In this case, as shown in FIG. 5, the child gate provided at the opening of the main body of the parent gate 30 which is raised and lowered by the elevator 31 is the gate equipment 10 which is the flap gate 11 of the present invention. Alternatively, as shown in FIG. 6, the child gate provided at the opening of the main body of the parent gate 30 that moves on the rail 32 is the gate equipment 10 that is the flap gate 11 of the present invention. In the case of such a gate facility 10, the flap gate 11 of the present invention can be operated even if the parent gate 30 cannot be operated due to the deposit.

  In the above embodiment, the upper end 12a of the gate main body 12 is rotatably mounted on the curtain wall 14, but the upper end 12a of the gate main body 12 may be rotatably mounted on the gate post 13.

  The convex curvature of the bottom surface 16a of the box body 16 is not limited to the arc described in the above embodiment as long as the bottom surface 16a can smoothly slide on the deposit 5, and may be an ellipse, an involute curve, or a sine. It may be a part of a curve or the like.

  In the embodiment shown in FIGS. 1 to 4, the gate body 12 is supported via the link 20, but as shown in FIG. 6, the gate is directly connected to the curtain wall 14 or the gate 13 without using the link. The upper end 12a of the main body 12 may be rotatably mounted.

DESCRIPTION OF SYMBOLS 5 Deposit 10 Gate equipment 11 Flap gate 12 Gate main body 12a Upper end part 12b Swing axis 12c Lower part 13 Gate post 14 Curtain wall 14a Support shaft 16 Box 16a Bottom surface 16b Downstream end 16c Downstream side surface 17 Stopper 20 Link 21 Cover body 30 Parent Gate

Claims (4)

The upper end is rotatably supported by a swing shaft arranged so that the cross-sectional direction of the waterway is the longitudinal direction, and the lower part is free to swing in the upstream and downstream directions of the waterway. A gate body that lower part swings downstream to open a closed water channel, while the downstream water level rises, a stopper provided on the upstream side keeps the water channel closed by a stopper provided,
A box provided on the downstream surface of the gate body so as to protrude downstream,
The box body has a bottom surface formed in a convex curved surface centered on the swing axis side from a lower end portion of the gate main body when viewed from a longitudinal sectional direction of the water channel, and a convex curved surface of the bottom surface from the swing axis. A flap gate having a bottom surface formed so that the distance to the surface gradually increases as the distance from the downstream surface of the gate body to the downstream surface increases . The flap gate according to claim 1, further comprising a cover body that covers an upper portion of the gate body and the box body. A gate facility, wherein the flap gate according to claim 1 is installed on a riverbed. 3. Gate equipment, wherein the flap gate according to claim 1 or 2 is installed as a child gate in an opening of a main body of a parent gate capable of blocking a water channel.

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