JP2013014993A - Floating body type flap gate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent water from flowing into a living space or an underground space even when the speed of the water at the beginning of the inflow is so fast that the water flows over before a door body floats up.SOLUTION: A floating body type flap gate 1 is installed in a pit 2 formed on a road surface at an opening or a gate, and comprises a door body 3 whose tip side stands up and oscillates with the base end side as a pivot in a height-direction plane against the water inflow direction in order to close the opening or the gate when a water flows in. A drainage gutter 5 is arranged at a designated location in the downstream side of the pivot point along the flowing-in water for taking-in the water that has flowed over the door body 3. The drainage gutter 5 is connected to the pit 2 so that the water inside the drainage gutter 5 can be lead to the pit 2. Taking the flowed-over water into the drainage gutter enables prevention of the inflow into a living space or an underground space. The water taken in the drainage gutter is lead to the pit and can supplement the floating action of the door body.

Description

  The present invention is installed at, for example, an opening of a breakwater or an entrance of a building, and when the water increases, a floating body that floats the door and blocks the opening or the entrance so that the increased water does not flow into the living space or the underground space It relates to a type flap gate.

  In order to prevent the increased water from flowing into the living space and underground space when the water increases, the buoyancy of the water that is going to flow in is used to float the door embedded in the concave pit, for example, to block the entrance of the building There is a floating flap gate (for example, Embodiment-2 of Patent Document 1).

  However, the floating flap gate disclosed in Patent Document 1 overflows into the living space and underground space due to the delay in the floating operation of the door when the moving speed of the water flowing on the floor surface is high at the beginning of the inflow. There is a problem to do.

  In view of this, a water drainage pipe penetrating the sea side is provided on the side wall of the door body storage chamber for storing the door body, and the seawater starts to be introduced into the door body storage chamber from the stage when the seawater rises to the height position of the water drainage pipe. For example, a floating-type flap gate that is installed at an opening of a seawall, for example, has been proposed (for example, Patent Document 2).

  However, even in the case where a water guide pipe penetrating the sea side is provided on the side wall of the door housing chamber, as in the floating flap gate proposed in Patent Document 2, water passes through the water guide pipe and the door housing chamber. It takes a certain time for the door body to flow into and to start the standing operation. Therefore, when the rising speed of water at the beginning of the inflow is high, there is a high possibility that the water will overflow the upper part of the door body before the door body starts to float and flow into the living space behind the seawall.

JP 2001-214425 A JP 2006-257829 A

  The problem to be solved by the present invention is that when the speed of water at the beginning of inflow is high, the floating action of the door body is delayed and overflows into the living space or underground space.

  The present invention does not overflow into the living space or underground space even when the speed of water at the initial inflow is high, and can assist the floating operation of the door body while preventing overflow. The purpose is to provide a floating flap gate.

The floating flap gate of the present invention is
Installed in a pit formed on the road surface of the opening or the entrance and exit, when water flows in, the base end side is placed in a plane in the height direction in the direction of the inflowing water to block the opening or the entrance and exit. It is a floating flap gate with a door body that swings upright as a fulcrum,
In a required position on the downstream side of the inflowing water from the fulcrum, a drainage groove for taking in the water that has overflowed the door body is provided, and the water in the drainage groove can be guided to the pit, The main feature is that the drainage channel and the pit communicated with each other.

  In the present invention described above, the water that overflows the upper part of the door body before the door body starts the floating operation can be taken into the drainage groove.

  In the present invention, when a water stop lid is provided to seal the backflow of water from the pit to the opening of the drainage groove at a required position, the water starts to flow back after the front end side of the door body has floated. Since the water stop lid acts as a check valve, it is possible to prevent water from flowing out from the opening and entering the backland.

  In the present invention, since the water that overflowed before the door body started floating operation can be taken into the drainage ditch, even when the speed of water at the beginning of the inflow is high, it can be prevented from flowing into the living space and underground space, Reliability as disaster prevention equipment is improved. Further, since the drainage groove and the pit communicate with each other, the water taken into the drainage groove while preventing overflow can be guided to the pit to assist the floating operation of the door body.

BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic block diagram which looked at the floating body connection type flap gate of this invention from the side surface side, (a) is a general view, (b) is an enlarged view of a drainage groove. It is the figure seen from the side direction explaining the effect | action of the said water stop of the floating body connection type flap gate of this invention which provided the water stop with the drain ditch, (a) is a water stop by the overflow water which flowed into the drain ditch. Figure (b) shows the state just before the start of levitation, (b) shows the state where water is introduced from the drainage groove to the pit, and the door block on the tip side starts to float, (c) shows water from the pit to the opening of the drainage groove. It is a figure of the state which the front-end | tip part of the water stop lid contact | adhered to one overhang | projection part by the pressure and buoyancy of the water which flows backward when it began to flow backward.

  The purpose of the present invention is to prevent overflow to living space and underground space even when the speed of water at the beginning of inflow is high, and to assist the floating operation of the door body while preventing overflow. A drainage groove is provided at the required position downstream of the water that flows in from the fulcrum on the base end side of the door body, and the water in the drainage groove is introduced to the pit. In addition, it was realized by connecting the drainage ditch and the pit.

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to FIGS.
FIG. 1 is a schematic view of a floating body-coupled flap gate of the present invention, which is embedded and installed so that the upper surface of the door body is at the same height as the road surface, as viewed from the side.

  In FIG. 1A, reference numeral 1 denotes a floating body-connected flap gate installed in a pit 2 having a concave surface formed between a road surface rs1 of an opening of a breakwater and an upper surface rs2 of a base body 6, for example. This floating body-connected flap gate 1 uses the water pressure of the inflowing water and the buoyancy of the door body 3 when water w flows in the direction of the arrow from the ocean (or river) toward the backland of the breakwater. The distal end side 4c is erected with the rotating portion 4b on the proximal end side of the body 3 as a fulcrum to block the opening in a watertight state.

  The door body 3 constituting the floating body connected flap gate 1 is divided in the height direction into two door body blocks having a hollow structure made of steel, for example. Hereinafter, these two door blocks are referred to as a front door block 3a and a base door block 3b from the upper side in the standing state.

  Then, between these door body blocks 3a and 3b and between the door body block 3b on the base end side and the upper surface rs2 of the base body 6, an attempt is made to flow from the ocean (or river) in a plane in the height direction. For example, it is connected by a distal end side rotating portion 4a and a proximal end side rotating portion 4b that can freely rotate by a predetermined angle toward the direction of water to be discharged. Between the door body blocks 3a and 3b and between the door body block 3b on the base end side and the upper surface rs2 of the base body 6, watertight rubber (not shown) is in a watertight state. Further, watertight rubber (not shown) is provided on the side of the door body 3 facing the door stop provided at the opening of the breakwater.

  Further, in this embodiment, the door block 3a on the front end side is configured to have a rotating portion 4a so as to be able to rotate by a predetermined angle in the direction opposite to the inflowing water so that it floats in advance when water flows in. ing.

  The floating body-connected flap gate 1 of the present invention shown in FIG. 1 is provided with a base 6 to which the rotating part 4b is connected first on the downstream side of the water flowing in from the rotating part 4b on the base end side, and then adjacent to the base 6 Thus, a drainage groove 5 having an opening 5a for taking in water flowing over the door body 3 is provided. The width of the drainage groove 5 in the direction intersecting with the inflowing water is the same as the width of the opening of the breakwater.

  And the drainage groove 5 and the pit 2 were provided in the base | substrate 6 which separates these so that the water which flowed in the drainage groove 5 can be led between the bottom face in the fall state of the door body 3, and the bottom face of the pit 2. The passage 6a communicates so that the bottom surface of the drainage groove 5 and the bottom surface of the pit 2 are continuous on the same plane. With such a configuration, the water that has flowed into the drainage groove 5 can be quickly introduced between the bottom surface of the door body 3 in the lying state and the bottom surface of the pit 2, so that the start time of the rising of the door body 3 can be shortened. .

  The opening 5a of the drainage groove 5 is covered with the grating 7 so that overflow water can flow into the interior and the upper part of the opening 5a can be safely passed by people and vehicles. As shown in FIG. 1B, the grating 7 is placed on the overhang portions 5b and 5c provided in the vicinity of the opening 5a. The road surface rs1, the upper surface of the door body 3, the upper surface rs2 of the base 6, the upper surface of the grating 7, and the road surface rs3 are all the same height so as not to hinder the passage of vehicles and the like.

  Reference numeral 8 denotes a flap-type water-stopping lid having a float and having a base-side rotating portion 8a rotatably attached to one overhanging portion 5b. The water stop lid 8 is a swing type check valve, which allows inflow of overflow water from the opening 5a, but when the water starts to flow backward from the pit 2 toward the opening 5a, the tip 8b is the other end. Close contact with the overhanging portion 5c side prevents water from flowing out from the opening 5a. Hereinafter, with reference to FIG. 2, the operation of the water blocking lid 8 will be described.

  As shown in FIG. 2A, the water w that has overflowed the door body 3 at the initial inflow passes through the grating 7 that covers the opening 5 a of the drainage groove 5 and flows into the drainage groove 5. At this time, the water stop lid 8 is in a state where the tip 8b is pressed downward by the pressure of the flowing water.

  Thereafter, the water stop lid 8 is floated by the water w flowing into the drainage groove 5, so that the water flowing into the drainage groove 5 is lying down from the passage 6 a communicating the drainage groove 5 and the pit 2 as described above. Water is introduced between the bottom surface of the door body 3 and the bottom surface of the pit 2. That is, in the present invention, the overflow water is taken from the drainage groove 5 to cause buoyancy in the door body 3 and assists the standing operation of the door body 3.

  At this time, in this embodiment, the door body 3 is constituted by the door body blocks 3a and 3b divided in the height direction, and as shown in FIG. The door body block 3b is started to rise before the door block 3b. Therefore, the water flowing in from the opening can be effectively guided to the lower side of the door 3 in the lying state.

  Then, when the tip 4c of the door block 3a on the tip side rises, the overflow is stopped, but water flows into the bottom surface side of the door 3, so that water flows from the pit 2 toward the opening 5a of the drain groove 5. Start to flow backwards.

  At this time, as shown in FIG. 2 (c), the tip 8b of the water stop lid 8 is in close contact with the other overhanging portion 5c by the pressure of the water flowing backward and the buoyancy of the water stop lid 8 itself. The space between the portions 5b and 5c is sealed by the water stop lid 8. Therefore, it is possible to prevent water from flowing out from the opening 5a and entering the living space or the underground space after the door body 3 stands.

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

  For example, the present invention can be applied to an integral floating flap gate in which the door body is not divided in the height direction. Moreover, when applying to the floating body connection type flap gate 1, the door body 3 is not limited to the one divided into two parts, for example, sequentially from the base end side according to the water level into which the door body block divided into three in the height direction flows. It may stand up.

  Further, when the opening of the breakwater to be blocked is wide, the door body 3 constituting the floating body-connected flap gate 1 is connected in the width direction of the opening, and the door bodies 3 are connected by watertight rubber between the doors. It is good also as a composition. In this case, the drainage grooves 5 may be provided for each door body 3 arranged in parallel in the width direction of the opening, or one drainage groove 5 may be provided for the entire width direction of each door body 3.

  Moreover, the water stop lid | cover 8 does not need to have a float (floating body), and may seal the opening 5a only using the pressure of the water which flows backward. The water stop lid 8 is not limited to a swing type, and may be a lift type or wafer type check valve, for example.

DESCRIPTION OF SYMBOLS 1 Floating body connection type flap gate 2 Pit 3 Door 4b Rotation part (fulcrum) of base end side
5 Drainage channel 5a Opening 8 Water stop lid

Claims (2)

Installed in a pit formed on the road surface of the opening or the entrance and exit, when water flows in, the base end side is placed in a plane in the height direction in the direction of the inflowing water to block the opening or the entrance and exit. It is a floating flap gate with a door body that swings upright as a fulcrum,
In a required position on the downstream side of the inflowing water from the fulcrum, a drainage groove for taking in the water that has overflowed the door body is provided, and the water in the drainage groove can be guided to the pit, A floating flap gate characterized in that a drainage channel and the pit are communicated.   The floating flap gate according to claim 1, further comprising a water stop lid that seals back flow of water from the pit to the opening of the drainage groove at a required position.

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