JP6114169B2 - Flap gate - Google Patents

Description

  The present invention relates to a flap gate.

  Conventionally, there is a flap gate (auto gate) as shown in FIG. The door 30 of the flap gate is supported by a connecting shaft 33 above the drain port 32 of the water channel 31 so as to be swingable in the inside and outside water directions. Then, it is freely swingable between a downward swing position D that closes the drain port 32 in the inner water direction with a fixed drain gap S and an upper swing position U that opens the drain port 32 in the outer water direction.

  The door body 30 is swung in the downward swing direction by the balance weight 34, and a float 35 is provided on the upper half of the inner surface of the door body 30.

  When the internal water level is low, the flap gate removes the internal water from the drain gap S, and when the internal water level becomes high, the door body 30 swings in the external water direction due to the water flow and water pressure of the internal water. The internal water is removed from the drain port 32.

  On the other hand, when the outside water level becomes high, when the outside water flows backward from the drain gap S or the drain port 32 to the inside water side and reaches the float 35, the door body 30 is swung in the inside water direction by the buoyancy of the float 35. The drainage port 32 is fully closed while moving to prevent backflow of outside water.

JP 2000-328545 A

  However, in the background art, if the internal water level does not reach the height at which the buoyancy of the float 35 acts due to the backflowed external water, the door body 30 is not fully closed, and thus there is much water leakage to the internal water side of the backflowed external water. There is a problem.

  Further, if the closing moment due to the weight of the door body 30 and the opening moment due to the weight of the balance weight 34 are balanced, the swinging moment of the door body 30 can be reduced. However, since the resistance moment is also reduced, there is a problem in that the door body 30 flutters due to the influence of waves and noise is generated.

  Furthermore, since there is the float 35 on the inner surface of the door body 30, there is a problem that the water flow is disturbed when the internal water is excluded.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a flap gate in which water leakage to the inside water side of outside water is extremely small, noise is hardly generated, and water flow is not disturbed. Is.

  In order to solve the above-mentioned problems, the present invention provides a lower swing position that is supported at the upper part of the drain outlet of the irrigation channel so as to be swingable in the inner and outer water directions, and closes the drain outlet in the inner water direction with a fixed drain gap. And a swingable door body at an upward swing position that opens the drain port in the direction of the outside water. The said door body is a flap gate rock | fluctuated by the balance weight in the downward rocking direction. A support girder provided at an upper portion of the water channel and projecting to the outside water side from the drain port, and is pivotally connected to the support girder by an inner water side first connecting shaft, and the inner water side first connecting shaft And an inner water side link having a balance weight attached to the upper end of the outer water side. Further, provided at the lower end portion of the inner water side link, the door body in which the upper end portion of the inner water side is swingably connected by the inner water side second connecting shaft, and the lower portion of the door body on the outer water side. And a float.

  According to the present invention, the internal water side link is pivotally connected to the support girder by the internal water side first connecting shaft, the balance weight is attached to the upper end portion of the internal water side link, and the lower end of the internal water side link is attached. The upper end portion on the inner water side of the door body is pivotably connected to the portion by the inner water side second connecting shaft. And a float is provided in the lower part of the external water side of a door body.

  Therefore, even when the internal water level is low, the internal water can be smoothly removed from the drain gap. Further, when the internal water level becomes high, the door body swings in the direction of the external water due to the water flow and water pressure of the internal water, so that the internal water can be smoothly drained from the drain port.

  On the other hand, when the outside water level becomes high, when the outside water reaches the float at the bottom of the door body, the door body swings obliquely backward due to the buoyancy of the float and the drain outlet is fully closed, so that the outside water level is Backflow of outside water can be prevented quickly from a low stage. Therefore, the leakage of the outside water to the inside water side is extremely reduced.

  In addition, the door body fully closes the drain port while swinging obliquely rearward and upward between the first connection shaft and the second connection shaft of the inner water side link, and in combination with the buoyancy of the float, Water pressure works. Accordingly, the upward component force is rapidly increased and the resistance moment is increased, so that the door is less likely to flutter due to the influence of the waves, and noise is hardly generated.

  Furthermore, since there is a float on the inner and outer surfaces of the door body, the water flow is not disturbed when removing the internal water.

  An outer water side link is provided in which the long hole of the upper end portion is swingably connected to the support girder by the first connecting shaft of the outer water side, and the outer water side of the door body is provided at the lower end portion of the outer water side link. The upper end of each of the two can be swingably connected by the external water side second connecting shaft.

  According to this configuration, the inner water side link and the outer water side link form a parallel link. Therefore, when the door body is swung downward and the drain port is fully closed, the door is connected to the inner water side second connecting shaft. Oscillation of the body to the outside water side is suppressed by the outside water side link. Therefore, the door body is less likely to flutter and noise is less likely to occur. Moreover, since the long hole of the outside water side link is connected to the outside water side first connecting shaft so as to be swingable, it does not become a hindrance when the door body swings to the maximum in the outside water direction.

  A driving means capable of swinging the door body upward to a forced fully open position may be connected to the inner water side link.

  According to this configuration, work such as inspection can be easily performed by forcibly fully opening the door body by the driving means.

  According to the present invention, water leakage to the inside water side of outside water is extremely small, noise is hardly generated, and the water flow is not disturbed.

It is the flap gate which concerns on this invention, (a) is a front view, (b) is a side view. FIG. 2 is a side view of a state in which the flap gate of FIG. 1 swings from a lower swing position to a fully open position. FIG. 2 is a side view of a state in which the flap game of FIG. 1 swings from a lower swing position to a fully closed position. FIG. 2 is a side view of a state in which the flap game of FIG. 1 is swung to a forced fully open position. It is a side view of the auto gate of background art.

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. FIG. 1 shows a flap gate, where (a) is a front view and (b) is a side view.

  A rectangular drainage port 2 is formed in the irrigation channel 1, the upstream side of the drainage port 2 (right side in FIG. 1B) is the internal water side, and the downstream side of the drainage port 2 [left side in FIG. 1B]. It is the outside water side. A step T is formed on the outside water side of the drain port 2. Normally, water on the inside water side (for example, sewage) flows down the step T from the drain port 2 and is drained to the outside water side (sewage treatment pond). Become so.

  A pair of left and right support girders 3 are provided on the upper portion of the water channel 1 so as to protrude substantially straight in the direction of the external water side from the drain port 2. An inner water side link 4 bent in a substantially square shape is connected to each support beam 3 by an inner water side first connection shaft 5 so as to be swingable.

  A balance weight 6 is attached to the upper end portion on the outer water side of the inner water side first connection shaft 5 of each inner water side link 4.

  The inner water side of the suspension bracket 8 at the upper end portion of the rectangular door body 7 that can open and close the drain port 2 is connected to the lower end portion of each inner water side link 4 by the inner water side second connecting shaft 9 so as to be swingable. Has been.

  A float 10 is provided at the lower part of the door 7 on the outside water side.

  As a result, the door body 7 swings in the direction of the internal and external water via the internal water side link 4, the internal water side first connection shaft 5, and the internal water side second connection shaft 9, above the drain outlet 2 of the water channel 1. It will be supported freely.

  The door body 7 has a downward swing position D that closes the drain port 2 in the inward water direction with a fixed drain gap S, and an intermediate position U1 that opens the drain port 2 in the outward water direction, as shown in FIG. It swings upward to a position U2 and a forced fully open position U3 as shown in FIG. Further, the door body 7 is normally swung in the downward swinging direction by the balance weight 6 at the normal time.

  On the other hand, a long hole 11a at the upper end of the substantially straight outer water side link 11 is connected to each support beam 3 by an outer water side first connecting shaft 12 so as to be swingable.

  The outside water side of the suspension bracket 8 at the top end of the door body 7 is connected to the bottom end of each outside water side link 12 by an outside water side second connecting shaft 13 so as to be swingable.

  The inner water side link 4 and the outer water side link 11 constitute a parallel link.

  If a flap gate is comprised as mentioned above, the internal water side link 4 will be connected with the support girder 3 by the internal water side 1st connection shaft 5 so that rocking | fluctuation is possible. And while attaching the balance weight 6 to the upper end part of the internal water side link 4, the upper end part of the internal water side of the door body 7 is rock | fluctuated by the internal water side 2nd connection shaft 9 at the lower end part of the internal water side link 4. Connect freely. Moreover, the float 10 is provided in the lower part of the outside water side of the door body 7.

  Therefore, when the internal water level WL1 is low (including when it is anhydrous), as shown in FIG. 1, the opening moment Wg · a due to the weight of the door body 7 and the closing moment Wb · b due to the balance weight 6 are Wg · a = Wb · b. Therefore, the door body 7 balances at the downward swing position D that closes the drain port 2 in the internal water direction with a fixed drain gap S therebetween. Thereby, even when the internal water level WL1 is low, the internal water can be smoothly removed from the drainage gap S.

  Further, as shown in FIG. 2, when the internal water level WL2 becomes high, the door body 7 swings upward from the intermediate position U1 in the external water direction to the fully open position U2 due to the flow and pressure of the internal water. The internal water can be removed smoothly. In addition, even if the inner water level WL2 becomes higher, the door body 7 can swing up to the forced fully open position U3 in FIG. 4 through the elongated hole 11a at the upper end of the outer water side link 11.

  On the other hand, as shown in FIG. 3, it is assumed that the external water level WL <b> 3 becomes high and the external water reaches the float 10 at the lower part of the door body 7. At this time, the relationship between the opening moment Wg · a Wg · a1 due to the dead weight of the door body 7, the closing moment Wb · b Wb · b1 due to the balance weight 6 and the closing moment F · c F1 · c1 due to the buoyancy is as follows. .

Wg · a <Wb · b + F · c
Wg · a1 <Wb · b1 + F1 · c1
For this reason, the door body 7 fully closes the drain port 2 while swinging obliquely rearward and upward as indicated by an arrow a by a closing moment due to the buoyancy of the float 10. Thereby, since the backflow of external water can be prevented promptly from the stage where the external water level is low, water leakage to the internal water side of external water is extremely reduced. In addition, what is necessary is just to change the installation height of the float 10, when changing the external water level at the time of the door body 7 beginning to close.

  Further, the door body 7 closes the drain port 2 while swinging obliquely rearward and upward with the first connecting shaft 5 and the second connecting shaft 9 of the inner water side link 4, combined with the buoyancy of the float 10. The water flow and water pressure of the outside water act. As a result, the upward component force suddenly increases and the resistance moment increases, so that the door body 7 is less likely to flutter under the influence of waves, and noise is less likely to occur.

  Furthermore, since there is the float 10 on the outer surface of the inner surface of the door body 7, the water flow is not disturbed when the internal water is removed.

  Further, since the inner water side link 4 and the outer water side link 11 constitute a parallel link, the inner water side second connecting shaft 9 is formed when the door body 7 is pivoted downward and the drain port 2 is fully closed. The swinging of the door body 7 to the outside water side is suppressed by the outside water side link 11. Therefore, the door body 7 is less likely to flutter and noise is less likely to occur.

  Furthermore, since the long hole 11a of the outside water side link 11 is connected to the outside water side first connecting shaft 12 so as to freely swing, when the door body 7 swings up to the forced fully open position U3 in the outside water direction. Will not be a hindrance.

  As shown in FIG. 4, when a hydraulic cylinder (driving means) 15 is installed at the upper part of the water channel 1 and the piston rod 15a of the hydraulic cylinder 15 is connected to the upper end of the inner water side link 4, the piston rod 15a is moved backward. The door body 7 can be swung up to the forced fully open position U3. Thereby, operations such as inspection of the door body 7 can be easily performed.

  In the above embodiment, the flap gate is a irrigation channel, but it can also be used as a backflow prevention gate such as a river or an estuary or a tsunami countermeasure flap gate.

DESCRIPTION OF SYMBOLS 1 Waterway 2 Drain port 3 Support girder 4 Inner water side link 5 Inner water side 1st connection shaft 6 Balance weight 7 Door body 9 Inner water side 2nd connection shaft 10 Float 11 Outer water side link 11a Elongated hole 12 Outer water side first 1 connecting shaft 13 outside water side second connecting shaft 15 hydraulic cylinder (driving means)
D Lower swing position U1 to U3 Upper swing position S Drain gap

Claims (3)

A lower swinging position, which is supported at the upper part of the drainage port of the irrigation channel so as to be swingable in the inner and outer water directions, closes the drainage port in the inner water direction with a certain drainage gap, and opens the drainage port in the outer water direction. A swingable door body is provided at a swinging position, and the door body is a flap gate that swings in a downward swinging direction with a balance weight,
A support girder provided above the irrigation channel and projecting to the outside water side from the drain;
An internal water side link that is swingably connected to the support girder by an internal water side first connection shaft, and a balance weight is attached to the upper end of the external water side relative to the internal water side first connection shaft;
The door body in which the upper end portion of the inner water side is swingably connected to the lower end portion of the inner water side link by the inner water side second connecting shaft;
A flap gate comprising a float provided at a lower portion of the door body on the outside water side.   An outer water side link is provided in which the long hole of the upper end portion is swingably connected to the support girder by the first connecting shaft of the outer water side, and the outer water side of the door body is provided at the lower end portion of the outer water side link. 2. The flap gate according to claim 1, wherein an upper end portion of each of the two is pivotably coupled by an external water side second coupling shaft.   The flap gate according to claim 1 or 2, wherein driving means capable of swinging the door body upward to a forcibly fully open position is connected to the inner water side link.

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