JP2002105934A - Flap gate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flap gate which prevents dust from being bitten in between a door body and a door stopper on natural draining. SOLUTION: The flap gate is constituted of a support member 6 installed on the upper part of a gate body 1 having a draining opening 2, a door body 3 movably supported by the support member to open/close the draining opening, a water-tight member 12 installed at the side wall of the door body and sliding between the side wall of the gate body and the side wall to maintain the water tight condition, the second water tight member 17 installed above the door body to make the upper side of the upper wall of the gate body water-tight when the door body is closed, and the third water-tight member 22 installed at the lower part of the door body and make water tight the gap between the door body and the lower face of the gate body when the door body is closed. And further, cushion members 25, 26 are put under the lower face of the gate body so that the door body comes into contact with the cushion members when the water tight member is brought into contact with the lower face of gate body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a flap gate in a drain gutter. More specifically, the present invention relates to a flap gate of a drain gutter that opens with a water flow with respect to a flow from an upstream direction in a flowing water direction and smoothly closes a door body when there is a flow in a reverse direction from a downstream to prevent a reverse flow.

[0002]

2. Description of the Related Art A drain gutter gate provided at a boundary between the sea and a river or a boundary between a main river and a tributary is normally opened to allow upstream water having a high water level to flow downstream. If the water level on the downstream sea side rises and flows backward, it must be closed. As a method of opening and closing by the natural flow due to the water level before and after the boundary in this way, a flap gate that swings the door body with the upper part of the door as a fulcrum and a miter gate that opens and closes the door body with a double door opening and closing are both used. Are known.

The door of the swing type drain gutter is shown in FIG.
As shown in FIGS. 0, 11 and 12, the drain gutter gate had a size larger than the inside size of the gutter tube box at the drain port. The gutter tube box is installed with its upper part slightly inclined upstream in the natural flowing water direction. The door attached to the gutter box box having this configuration is opened by receiving the water pressure of the natural water flow from the upstream, and when there is a backflow from the downstream, the door is closed by the water pressure to prevent the backflow.

[0004]

However, in the former case,
Normally, when flowing from upstream to downstream, the door is opened, so there is no problem when water flows smoothly. The gap between the door body and the side surface of the gutter tube box is constricted in an L shape, and the size of the gap changes depending on the water level. Since the degree of opening of the door changes depending on the water level, dust that floats in a complicated shape, such as driftwood, flows and gets caught in the gap next to the open door,
The fact that it did not come off from this door body occurred repeatedly.

[0005] In the case of backflow, the door is closed by water pressure, but there are many troubles that damage the watertight device due to impact or the like. As described above, when water flows in the opposite direction, dusts are caught between the door body and the door stop of the gutter box box, and there has been a problem that the backflow cannot be prevented. In the case of the latter, there is a possibility that refuse is trapped in the hinge portion of the door body and the backflow cannot be prevented.

The present invention has been made in view of the above background, and achieves the following objects. The purpose of this invention is
An object of the present invention is to provide a flap gate that prevents dust from being caught between a door body and a door stop at the time of natural drainage, protects a watertight device, and smoothly opens and closes.

[0007]

SUMMARY OF THE INVENTION A flap gate according to the present invention is an apparatus which is installed on a gate of a water channel having a drainage port. A door body movably supported to open and close the drainage port by a water flow, a watertight member provided on a side wall of the door body and sliding between a side wall of the gate body to maintain a watertight state, and the door body A second watertight member provided at the upper part of the door and watertight between the upper wall of the gate when the door is closed, and the second watertight member provided at the lower part of the door when the door is closed. And a third watertight member for watertight between the lower wall surface of the gate body. Further, a cushion member may be provided on a lower wall surface of the gate body, and the door body may be brought into contact with the cushion member before the third watertight member becomes watertight.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 10, 11 and 12 show a conventional example, and FIG. 10 is a side view of a flap gate and a door 3.
Indicates a closed state. The door 3 is swingably supported by two shafts 31 and 32 via a support plate 30 on a support 29 attached to concrete serving as a base of the gate. Water-tight rubbers 33 and 34 provided on the upper and lower parts of the door body are also not shown in this figure, but the side surfaces of the door body 3 also form a water-tight structure. It comes into contact with each door fitting 35, 36 buried in concrete.

FIG. 11 is a partial view showing a watertight state beside the door 3, and the watertight rubber 3 attached to the door 3 is similar to the above.
7 comes in contact with a door fitting 38 buried in concrete. Normally, water flows from the upstream A to the L-shaped gap C of this door installed at the drain port, but since there is a gap, the dust 39 is separated from the watertight rubber 37 and the door support as shown in the figure. It may be bitten between the fittings 38. In this state, at the time of backflow, even if the door body 3 is closed, if the dust 39 is present, the door body 3 will not be completely closed.

When this state is viewed from the side of the door body 3 (not shown), the door body 3 swings and opens and closes, so that when the door body 3 is opened, the gap C is narrower at the upper side and wider at the lower side to form a substantially triangular shape. It becomes the shape of. Therefore, the floating dust 39 enters the gap C, and a state in which the dust 39 is not easily removed occurs.

FIG. 12 is a partial view showing the structure of the lower part of the door 3. The watertight device is the same as above, and the water from the upstream flows under the door as shown in the figure. The figure shows a state in which the door body 3 is opened. However, when the door body is closed due to the backflow, the watertight rubber 34 may come into contact with the door fitting 36 in an impact.

[Embodiment 1] Next, an embodiment of the present invention will be described. FIG. 1 is a front view of the flap gate, and FIG. 2 is a side view. The flap gate is provided at a drain gutter gate, and is installed at a boundary between a water channel A such as a river on the upstream side and a sea B on the downstream side. Normally, water is drained from A to B as a natural flow. Reference numeral 1 denotes a concrete gutter tube box (portal body) serving as a base of a gate for installing the flap gate.

The gutter tube box 1 constitutes a substantially rectangular gate, and the inside is a drain port 2. The door body 3 of the flap gate comes into contact with the gutter tube box 1 having the rectangular drain port 2 in a state of covering the same.

A door fitting 4 for watertightness is buried in concrete around the gutter tube box 1. A bearing 5 is provided on an upper portion of the gutter box box 1, and an upper support member 6 is supported by the bearing 5. The door body 3 is attached to the upper support member 6 and is swingable about the axis of the upper support member 6. The door 3 opens by the water pressure due to the natural flow from the upstream and closes by the reverse flow.

The door body 3 is made of shaped steel plate and is reinforced by stretching a girder. This girder is the outer plate 7 of the door 3
A main girder 8, a vertical girder 9 and a horizontal girder 10 are attached to the main body. A lower support member 11 is buried in concrete below the door body 3 and below the drain port 2 of the gutter tube box 1. The configuration of the lower support member 11 will be described in detail with reference to FIG.

FIG. 3 is a plan view of the flap gate. A watertight device is provided on a side surface of the door body 3. In this watertight device, a watertight portion is formed of a Y-shaped watertight rubber 12 (watertight member), and is fastened to an outer plate 7 of the door body 3 by a holding metal 13 with a bolt and nut 14. The end of the watertight rubber 12 abuts against a sliding plate-shaped door fitting 15 provided on the side wall of the gutter tube box 1 in a direction crossing the water flow, and maintains a watertight state.

The watertight rubber 12 does not come off the door fitting 15 even when the door 3 swings in the opening and closing operation.
The outer panel 7 has a structure in which main vertical girders 8 are provided on both sides, a vertical girder 9 is provided in the center, and a horizontal girder 10 is provided across the main girder. For this reason, it has a strong structure that can withstand water pressure.

The drainage by natural flow is from upstream A to downstream B
However, the water flowing to the door 3 flows only from below the door 3 including dust and the like. When the water level and the amount of water on the upstream side decrease, the opening degree of the door body is lost and dusts such as suspended matter do not flow downstream and accumulate at the upstream side of the door body 3. The small amount of garbage collected is removed along with the next natural stream. Even if the door 3 is opened and closed by swinging, the watertight rubber slides while always in contact with the door fitting, so that the garbage does not catch on the door and water flows smoothly from below.

FIG. 4 shows the details of the upper structure of the door 3 and shows a state at the time of drainage. A door fitting 16 is buried in concrete at the upper end of the drainage port of the gutter tube box 1. On the other hand, a P-type watertight rubber 17 is fixed to the door 3 by a bolt and nut 19 with a holding member 18.
When the door 3 is closed, the watertight rubber 17 is in close contact with the door outer surface 16a of the door fitting 16 and maintains a watertight state.

FIG. 5 shows the lower structure of the door 3. At the lower end of the drainage port 2 of the gutter tube box 1, a lower support member 21 including a door fitting 20 is embedded in the concrete bottom. The door fitting 20 is attached flat to the concrete bottom. The P-type watertight rubber 22 is fixed to the outer plate 7 of the door 3 by a bolt 23 using a holding member 23 as in the case of FIG. This door 3
When is closed, the watertight rubber 22 is in close contact with the door fitting 20 and maintains a watertight state.

With this configuration, the water from the upstream normally flows along the bottom of the channel without any step as shown by the arrow. The bottom stopper 3a of the door body 3 comes into contact with the door fitting 20 of the lower support member 21, and the movement of the door body 3 stops. At this time, the watertight rubber 22 also comes into contact with the door fitting 20, but at the same time, the door 3
The bottom stopper 3a is locked to the door fitting 20 to prevent the watertight rubber 22 from being damaged by press contact.

[Embodiment 2] FIGS. 6 and 7 show another embodiment. FIG. 6 is a front view, and FIG. 7 is a side view. This is an example in which a cushion member 25 (lower support member) is provided at a lower portion of the door body 3 and a concrete bottom portion shown in FIG. Two cushion members 25 are installed on both sides according to the width of the door body 3, and the upper surface is installed so as to project slightly above the concrete bottom surface of the gutter tube box 1. The cushion member 25 is made of an elastic material such as rubber.

When the door 3 closes in the reverse flow, the bottom 8a of the door 3 abuts in a wedge state so as to slide on the upper surface of the cushion member 25, and finally the watertight rubber 22 hits the door fitting 20 and becomes watertight. Maintain state. The water-tight structure can be established without the attachment of the elastic body, but with the elastic body, it is possible to reduce the impact due to wind pressure or water pressure applied to the door body 3 at the time of opening and closing. It is effective from the aspect.

Third Embodiment FIGS. 8 and 9 show modified examples of FIGS. 6 and 7, in which a cushion member 26 (lower support member) is provided on the bottom concrete side wall of the gutter tube box 1. FIG. It is an example. When the door 3 is closed, the bottom 8 a of the main stringer 8 of the door 3 comes into contact with the cushion member 26. In this case, a part 8a of the main stringer 8 comes into direct contact, but the cushion works to reduce the impact. The watertight rubber 27 abuts the door fitting 28 almost simultaneously, and maintains a watertight state.

In the case of this example, the concrete bottom becomes a step. The effect in this case is the same as that of the second embodiment in that the function of the cushion is provided. The effects are almost the same as those of the second and third embodiments, but which one to select may be determined according to the form of the water channel. The embodiments of the present invention have been described above, but the objects of the present invention are not limited thereto.

[0026]

As described above, the watertight rubber is provided on the side surface of the door so as to maintain the watertight state even when the door swings in the opening and closing operation, so that the bottom of the door is watertight. When the device comes into contact, the door is closed so that it can be relaxed without impact, so that dust does not get caught between the door and the door stop during natural drainage, and the opening and closing operation can be performed smoothly. Became.

[Brief description of the drawings]

FIG. 1 is a front view showing a flap gate of the present invention.

FIG. 2 is a side view showing a flap gate according to the present invention.

FIG. 3 is a plan view showing a flap gate according to the present invention.

FIG. 4 is a partial view showing an upper part of a flap gate.

FIG. 5 is a partial view showing a lower portion of the flap gate.

FIG. 6 is a front view showing a flap gate according to a second embodiment.

FIG. 7 is a side view showing a flap gate according to the second embodiment.

FIG. 8 is a front view showing a flap gate according to a third embodiment.

FIG. 9 is a side view showing a flap gate according to the third embodiment.

FIG. 10 is a side view showing a conventional example of a flap gate.

FIG. 11 is a partial plan view showing a conventional example of a flap gate.

FIG. 12 is a partial side view showing a conventional example of a flap gate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Gutter tube box 2 ... Drain port 3 ... Door body 4, 15 ... Door fitting 5 ... Bearing 6 ... Upper support member 7 ... Outer plate 8 ... Main vertical girder 11 ... Lower support member 12,17,22 ... Watertight rubber 25, 26 ... Cushion member

Claims (2)

[Claims] 1. A device installed in a gate of a water channel having a drain, comprising: a support member provided on an upper portion of the gate; A door body that opens and closes; a watertight member that is provided on a side wall of the door body and slides between the side walls of the gate body to maintain a watertight state; and a door body that is provided on an upper part of the door body and is closed. A second watertight member for watertight between an upper wall of the gate body and a lower watertight member provided at a lower portion of the door body when the door body is closed. Flap gate comprising a third watertight member. 2. The flap gate according to claim 1, wherein a lower support member is provided on a lower surface of the gate body, and the door body contacts the lower support member when the third watertight member becomes watertight. A flap gate characterized by being in contact.