JP4136875B2 - Flash gate - Google Patents

Description

  The present invention relates to a flush gate that periodically flushes rivers, sewage pipes, irrigation canals, and the like.

  Conventionally, a flush gate is known that periodically flushes rivers, sewage pipes, irrigation canals, and the like. For example, Patent Literature 1 includes a stand-up / fall-overable weir plate whose base is pivotally attached to the bottom of a water channel, and a hoisting device installed on a dike, and is supported in an upright state by the hoisting device. The falling weir is configured to be turned over when the water level rises above a certain level, and when the water level in the water channel drops to a predetermined standing water level due to the overturning, the hoisting device is operated to rise again. The water tank is provided with a water tank into which the water from the water channel flows, and the water tank is formed with an upward opening having an area equal to or greater than the cross-sectional area of the water tank, so The weight can be increased to ensure stable and rapid lodging, and it is possible to quickly reduce the weight due to the lodging, and it is possible to quickly stand up again after water discharge and resume water storage. It has been proposed.

According to the technique described in Patent Document 1 and the like described above, components such as a hoisting device and a dam plate support wire for raising the falling dam plate again are required, and the structure is complicated, and the power source There is a problem that it cannot be operated in areas or places where facilities are not maintained, and the applicant of the present application does not use a hoisting device that requires power such as human power or an electric motor, and the valve body is in a standing water stop posture As shown in FIG. 9, the base a is pivotally attached to the bottom of the water channel b as a flush gate that automatically falls and flushes the valve body and automatically returns the valve body to the standing water posture after washing. The valve body c swingable between a standing water stopping posture that closes the water channel b and a falling posture that opens the water channel b, and the standing water until the water level in the water channel b rises to the flush execution water level HHWL. The posture is maintained by the lock mechanism. At the same time, when the flush execution water level HHWL is reached, the lock mechanism is released in conjunction with the float, and the posture switching mechanism d allowing the swing to the fall posture, and the elastic member disposed around the swing axis And a balance gate that can move up and down in the valve body, and a flush gate having a posture return mechanism e that automatically returns the valve body in a fallen posture to the standing water stop posture (Japanese Patent Application No. 2003-098432).
JP 2001-131945 A

  However, the conventional overturning type flash gate is configured so that water flows out to the downstream side beyond the upper end of the valve body as the valve body is tilted to the falling posture, so it accumulates at the bottom of the upstream side. When solid matter such as earth and sand flowing down flows downstream, there is a problem that the upstream water level is low and the conveying force of the solid matter becomes weak. Therefore, in order to ensure that sediment, etc., accumulated at the bottom flows down to the downstream side, the flush gate is positioned downstream from the bottom of the upstream water channel so that the valve body that has fallen into the falling position is lower than the bottom surface of the upstream water channel. A part of the valve body in a falling position was installed in a stepped part where the bottom part of the water channel is lowered, and the pivot axis of the valve body is arranged at a position lower than the bottom part of the upstream water channel. If it is at a position slightly higher than the bottom of the upstream water channel, solid matter such as earth and sand accumulates in the vicinity of the valve body, and there is a possibility that the opening and closing operation of the valve body may be hindered.

  On the other hand, when installing a flash gate in a pipe or the like where no stepped portion is formed, the bottom surface on the downstream side of the gate is excavated to form a recess so that the valve body in a falling posture is accommodated in the recess. However, there was a risk that water and earth and sand would accumulate in such a recess, resulting in hindrance to the opening and closing operation of the valve body.

  In view of the above-mentioned conventional drawbacks, the object of the present invention is to make sure that solid foreign matter such as earth and sand is reliably transported to the downstream side during the overturning operation of the valve body for flush cleaning without selecting the installation position, and the valve body opening and closing operation The present invention is to provide a highly reliable flash gate that does not cause any trouble.

In order to achieve the above-mentioned object, the first feature of the flash gate according to the present invention is that the lower end is pivoted to the gate portion at or near the bottom of the water channel as described in claim 1 of the claims. A valve body swingable between an upright standing posture that closes and closes the water channel and a falling posture that opens the water channel, and the standing still water posture until the water level of the water channel rises to a flush execution water level. A flush gate having a posture switching mechanism that maintains the holding portion and releases the holding portion when a flush execution water level is reached and allows rapid swinging to the falling posture, wherein the valve body is in a falling posture. In this state, an opening capable of passing water along the bottom surface of the water channel is formed between the bottom of the water channel and the valve body.

According to the above-described configuration, when the valve body is in a falling posture , the earth and sand can be reliably flowed down together with water from the opening formed along the bottom surface of the water channel between the bottom of the water channel and the valve body. Therefore, earth and sand are not deposited near the valve body, and the reliability of the opening / closing operation is improved. And if it is such a flash gate, it is not necessary to install it in the step part of the water channel or excavate the bottom surface on the downstream side to form the concave part, and it can be easily constructed at the flat bottom part of the pipe line or flow path. Can now.

  In addition to the first feature configuration described above, the second feature configuration includes the bottom of the water channel and the valve as the valve body is tilted to the fall posture by the posture switching mechanism. An opening that allows water to flow along the bottom surface of the water channel is formed between the body and the body.

  When the valve body is tilted toward the falling position, an opening that allows water to flow along the bottom surface of the water channel is formed between the bottom of the water channel and the valve body. Since it is in the flush execution water level, the water pressure at the bottom is also high, and the sediment deposited on the bottom under such a high water pressure surely flows down downstream from the opening. Therefore, even in the case of a flash gate in which a recess is formed by excavating the bottom surface on the downstream side, the disadvantage that earth and sand accumulates in the recess and obstructs the opening / closing operation of the valve element is solved.

  In the third feature configuration, as described in claim 3, in addition to the first or second feature configuration described above, the water in the water channel is in the process of tilting to the standing still water posture and the falling posture. The valve body is provided with a hollow portion that flows in and drains water that flows in the fall posture, and the elastic energy accumulated with the posture change from the standing water posture to the fall posture causes the valve body to move from the fall posture. A posture return mechanism for automatically returning the valve body to a standing water stop posture is provided, and the fall promoting force acting on the valve body by overcoming the posture return force by the posture return mechanism is overcome by the tilting of the valve body to the fall posture. Therefore, the valve body is configured to fall down.

  According to the above-described configuration, the water pressure in the water channel rising to the flush execution water level is applied to the valve body as a pressing force, and this pressing force overcomes the posture return force by the posture return mechanism and tilts the valve body in the overturning direction. Let In this state, the valve body is subjected to a large overturning promoting force due to the pressing force, the weight of the valve body, and the sum of the weight of the water flowing into the hollow portion, and the valve body suddenly falls to open the water channel. As a result, flush cleaning is performed. At the same time as flushing, the water in the hollow part is also discharged downstream, and the force against the posture return mechanism is reduced to the same level as the weight of the valve body. To prepare.

  In the fourth feature configuration, as described in claim 4, in addition to the third feature configuration described above, the posture return mechanism is disposed around a pivot axis of the valve body, and the valve body is A spring that is constantly urged in the standing direction, and a balance weight that moves in a direction that increases the posture returning force in accordance with the posture returning operation from the falling posture to the standing water stopping posture by the spring. By configuring in this way, the balance weight compensates for the return force of the spring that gradually decreases with the return from the falling posture to the standing water posture, and can quickly return to the standing water posture. .

  In the fifth feature configuration, in addition to the fourth feature configuration described above, a spring case that houses the spring is provided in the gate portion, and the width of the opening and the water channel The configuration is such that the width is substantially equal, and by configuring in this way, the opening can be configured to be substantially equal to the width of the water channel when the valve body is shifted to the falling posture, and the spring case This prevents the flow of water and accumulated sediment from being hindered.

  In the sixth feature configuration, in addition to any of the first to fifth feature configurations described above, a protrusion is provided on the downstream facing surface of the valve body, and the projection is The upper end portion of the valve body is closer to the bottom portion than the lower end portion in contact with the bottom portion of the water channel, and along the bottom surface of the water channel between the upper and lower end portions of the valve body and the bottom portion of the water channel. In this way, an overturning posture regulating mechanism is provided in which an opening that allows water to flow is formed, so that an opening is reliably formed along the bottom surface of the water channel between the valve body in the overturning posture and the bottom surface of the water channel. The Furthermore, since the falling posture is maintained in a state where the upper end portion of the valve body is closer to the bottom portion than the lower end portion, the discharge of water from the hollow portion and the movement of the balance weight to the upper end side are reliably ensured.

  As described above, according to the present invention, solid foreign matters such as earth and sand are reliably transported to the downstream side during the overturning operation of the valve body for flush cleaning without selecting the installation position, which hinders the opening and closing operation of the valve body. It is now possible to provide a highly reliable flash gate that does not cause any problems.

  Hereinafter, an embodiment of a flash gate according to the present invention will be described with reference to FIGS. As shown in FIGS. 1 to 4, the flash gate 1 is pivotally connected between a pair of left and right gate pillars 7 </ b> A in which a shaft portion 9 provided at the lower end portion constitutes the gate portion 7 at or near the flat bottom of the water channel 8. A standing water stopping posture (shown by a solid line in FIG. 4) that closes the water channel 8 and stores water upstream of the water channel 8, and a falling posture that opens the water channel 8 and passes water downstream (FIG. 4). 4 (shown by a broken line in FIG. 4), and the standing water stop posture is maintained by the holding unit 30 until the water level of the water channel 8 rises to the flush execution water level HHWL. At the same time, when the flush execution water level HHWL is reached, the holding portion 30 is released and the posture switching mechanism 3 that allows the swing to the fall posture and the valve body 2 in the fall posture are automatically set to the standing water stop posture. Consists of posture return mechanism 4 for return It is.

  As shown in FIG. 2, the valve body 2 is formed with notches 27 at both lower end portions thereof, and a base portion of the gate portion 7 arranged at the lower end portion flush with the bottom portion of the water channel 8 in the standing water stopping posture. As shown in FIG. 1, both end portions in the width direction of the upstream facing surface 22 of the water channel 8 are in watertight contact with the seal surface 7a disposed on the gate pillar 7A, as shown in FIG. The end portion of the cutout portion 27 is in watertight contact with the seal surface 7b disposed on the bulging portion 7B formed so as to protrude from the lower portion of the gate pole 7A toward the center. It is configured to prevent the outflow.

  As shown in FIGS. 1, 2, and 7, a hollow portion 20 having a plurality of small-diameter openings 23 formed on a wall surface is provided on the upstream facing surface 22 side of the valve body 2, and the standing water is stopped. In the posture, the water of the water channel 8 flows into the hollow portion 20 from the opening 23, and the water in the hollow portion 20 flows out from the drain port 24 formed on the top surface in the falling posture. A movement path 25 of a balance weight 42 described later is formed on the left and right end sides of the hollow portion 20.

  The posture returning mechanism 4 is configured to automatically return the valve body 2 from the falling posture to the standing water posture by the elastic energy accumulated with the posture change from the standing water posture to the falling posture. Specifically, a pair of left and right helical springs arranged around the pivot axis P of the valve body 2 and twisted and fixed in the spring case 41 so as to constantly bias the valve body 2 in the standing direction. 40 and a balance weight 42 that moves in the movement path 25 so as to increase the posture return force in accordance with the posture return operation from the overturned posture to the standing water stopping posture by the spring 40.

  As shown in FIGS. 2 and 6, the posture switching mechanism 3 is divided and installed in a gate portion 7 where the valve body 2 and the valve body 2 are separated from each other, and a float 31 and a float installed on the valve body 2 side. It comprises a rod 32, an engagement / disengagement mechanism 33, and an engagement hole 34 installed on the gate portion 7 side. The float 31 is accommodated in the hollow portion 20 so as to be movable up and down, and is connected to the engagement / disengagement mechanism 33 installed in the case 35 on the downstream facing surface 26 side of the valve body 2 via the float rod 31. Yes. The engaging / disengaging mechanism 33 may be disposed inside the valve body 2.

  As shown in FIG. 6, the engagement / disengagement mechanism 33 protrudes in a watertight manner to the support shaft 33 </ b> A that is horizontally supported rotatably in the hollow portion 20 of the valve body 2 and the downstream facing surface 26. A rotating plate 33B having a base fixed to one end of the support shaft 33A, a pair of rods 33C connected to the free end of the rotating plate 33B and supported substantially horizontally, and attached to the tip of the rod 33C The rod 33C is formed by rotating the pivot plate 33B around the axis P2 in conjunction with the support shaft 33A that rotates according to the vertical movement of the float 31. Is configured to be able to reciprocate.

  The lock claw 33D is inserted into a case 33E fixed to the tip of the rod 33C via a spring 33F, and is protruded and held outside the case 33E by the urging force of the spring 33F. When the taper surface 33d interferes with the left and right gate pillars 7A of the gate portion 7 immediately before 2 returns to the standing water stopping posture, the taper surface 33d slides while being pressed into the case 33E, and returns to the standing water stopping posture. It engages with the engagement hole 34 formed in the gate pole 7A and enters a locked state. That is, the engagement / disengagement mechanism 33 serves as the holding unit 30 that maintains the standing water stopping posture.

  The float 31 rises as water flows into the hollow portion 20 from the opening 23 of the valve body 2 in the standing water stopping posture, and the locked state is maintained at a water level HWL lower than the flush execution water level HHWL. However, when the flush execution water level HHWL is reached, the engagement state by the engagement / disengagement mechanism 33 is released, and the valve body 2 starts to tilt to the falling posture.

  That is, the valve body 2 is loaded with the water pressure of the water channel 8 rising to the flush execution water level HHWL as a pressing force, and this pressing force overcomes the spring force of the helical spring 40 in the posture return mechanism 4 and falls. Tilt a little to get a posture. In this state, the pressing force, the dead weight of the valve body 2 and the sum of the weight of the water in the hollow portion 20 act to act as a fall accelerating force, and rapidly fall to the state of the fall angle θ = 90 + α degrees shown in FIG. Then, the water channel 8 is opened downstream, and flush cleaning is performed. In this state, the balance weight 41 located at the lower part of the moving passage 25 (the lower end side of the valve element 2) rolls to the upper part (the upper end side of the valve element 2).

  Almost simultaneously with the end of the flush cleaning, the water in the hollow portion 20 is drained downstream from the opening 24 on the top surface, the fall accelerating force is greatly reduced, and the return by the helical spring 40 of the posture return mechanism 4 is restored. The urging force becomes larger than the sum of the weight of the valve body and the weight of the balance weight 41 moved to the tip end side of the tilted valve body 2, and the return weight is rotated and returned.

  The return urging force by the helical spring 40 gradually decreases as the valve body 2 returns from the falling posture to the standing water stopping posture, but the balance weight 41 moves to the base side as the posture changes, and the center of gravity of the valve body 2 Is reduced to compensate for the return biasing force, and the valve body 2 is rapidly returned to the standing water stopping posture. In this state, the engagement / disengagement mechanism 33 is engaged to maintain the standing water stopping posture.

  More specifically, at both end portions of the downstream facing surface 26 of the valve body 2, a falling posture regulating mechanism 5 configured by a pair of left and right ribs 50 as projections to which the shaft portion 9 is fixed is provided. Yes. As shown in FIG. 4, at the initial stage of tilting of the valve body 2 to the fall posture by the posture switching mechanism 3, the seal member 2 a is separated from the base portion 7 </ b> C of the gate portion 7, and the bottom portion of the water channel 8. A slight opening 6 is formed between the valve body 2 and the upper surface of the base portion 7 </ b> C of the gate portion 7. As the valve body 2 tilts, the opening area is increased, and the upper end portion of the valve body 2 is closer to the bottom portion than the lower end portion in a state where the rib 50 is in contact with the bottom portion of the water channel 8 in the falling posture. And it is comprised so that the big opening 6 may be formed between the upper end part and lower end part of the said valve body, and the bottom part of the said water channel. Here, the protrusions are not limited to those constituted by ribs, and the shape and position of the ribs are not limited to those illustrated.

  As shown in FIG. 5 (a), since the upstream water level is at the flush execution water level HHWL at the beginning of the tilting of the valve body 2 to the overturned posture, a large water pressure acts on the bottom and the upstream side of the water channel 8 As shown by the alternate long and short dash line in the figure, the earth and sand accumulated on the bottom surface starts to flow down from the opening 6, and the flow rate increases due to the increase in the opening area accompanying the tilting and flows out to the downstream side vigorously. ), The earth and sand are surely flowed down in a large opening state formed in the fall posture.

  As shown in FIG. 7, the bulging portion 7B formed so as to project from the lower part of the gate post 7A in the central direction similarly avoids contact with the spring case 41 formed so as to project from the lower part of the gate post 7A in the central direction. Although it is arranged to ensure a seal in a standing water stop posture with respect to the notch portion 27 formed in the lower part of the valve body 2, the water at the time of flushing is washed in the upstream water channel of the bulging portion 7B. Since the flow becomes slow and there is a risk of sediment accumulation, a guide wall portion 8a is provided to smooth the water flow and avoid sediment accumulation when the valve body 2 is opened.

  Hereinafter, another embodiment will be described. In the embodiment described above, the guide wall portion 8a is provided in the upstream water channel of the bulging portion 7B so as to avoid the accumulation of earth and sand, but the spring case 41 is configured inside the gate column 7A. As a result, the width of the opening 6 and the width of the water channel 8 can be made substantially equal, and the sediment deposited on the upstream side can be reliably transferred to the downstream side.

  Further, although the spring 40 constituting the posture return mechanism 4 has been described around the pivot axis P of the valve body 2, the installation position of the spring 40 is not limited to this, and other positions The return urging force may be arranged so as to be transmitted to the valve body 2 through power transmission means constituted by a gear mechanism or the like. For example, if a spring is arranged above the gate pillar 7A in a posture parallel to the swing axis P, and a power transmission mechanism is arranged in the gate pillar 7A, the return urging force is transmitted to the valve body 2. There is no need to provide a bulging portion 7B on the upstream side where earth and sand may stay.

  In the embodiment described above, the case where the flush gate is installed in a position where the bottoms of the upstream and downstream water channels are flat, and the recessed part that becomes the accommodating part when the valve body falls is formed in the downstream bottom part is not described. However, even if the concave portion is formed in the bottom portion on the downstream side, the present invention can eliminate the inconvenience that earth and sand accumulate in the concave portion, and can be applied even if it is installed in the step portion. Is possible.

  Any of the above-described embodiments is an example of the present invention, and the scope of the present invention is not limited by the specific configuration described above, so that the effects of the present invention can be achieved with respect to known flash gates. When the valve body is tilted toward the falling posture, or when the valve body is in the falling posture, the configuration is limited as long as an opening capable of passing water is formed between the bottom of the water channel and the valve body. is not.

Top view of the flash gate Front view from the downstream side of the flash gate Cross-sectional side view of the flash gate with the valve body in the standing water stop posture Explanatory drawing of the flash gate that changes the posture of the valve body from a standing still water posture to a falling posture Explanatory drawing of the water flow state when the valve body is in a falling posture Explanatory drawing of posture change mechanism of flash gate Top view of the flash gate with the valve body in a falling position The top view of the flash gate which shows another embodiment and has a valve body in a fall posture Explanatory drawing of the flash gate that shows the conventional example and changes the posture of the valve body from the standing water posture to the falling posture

Explanation of symbols

1: Flash gate 2: Valve body 3: Posture switching mechanism 4: Posture return mechanism 5: Falling posture regulating mechanism 50: Rib (protruding portion)

Claims (6)

A lower end portion pivotally attached to the gate portion at or near the bottom of the water channel, and swingable between a standing water stopping posture that closes the water channel and a falling posture that opens the water channel, and a water level of the water channel A posture switching mechanism that maintains the standing water stop posture by a holding unit until the flush execution water level rises, and releases the holding unit when the flush execution water level is reached and allows rapid swinging to the falling posture. A flush gate provided with an opening that allows water to flow along a bottom surface of a water channel between a bottom portion of the water channel and the valve body when the valve body is in a fallen posture.   The flush gate according to claim 1, wherein an opening that allows water to flow along a bottom surface of the water channel is formed between a bottom portion of the water channel and the valve body as the valve body is tilted to the falling posture by the posture switching mechanism.   The valve body has a hollow portion into which water from the water channel flows in in the process of tilting to the standing still water posture and the falling posture, and the water flowing in in the falling posture is discharged, and from the standing water stopping posture. A posture return mechanism that automatically returns the valve body from the fall posture to the standing water stop posture by the elastic energy accumulated with the posture change to the fall posture, and by the tilting of the valve body to the fall posture 3. The flash gate according to claim 1, wherein the overturn promoting force acting on the valve body overcomes the posture return force by the posture return mechanism to cause the valve body to fall over.   The posture return mechanism is arranged around a swing axis of the valve body, and a spring that constantly urges the valve body in a standing direction, and a posture return operation from the falling posture to the standing water stopping posture by the spring. 4. The flash gate according to claim 3, further comprising a balance weight that moves in a direction to increase the posture return force.   The flash gate according to claim 4, wherein a spring case that accommodates the spring is provided in the gate portion, and the width of the opening and the width of the water channel are substantially equal.   A protrusion is provided on the downstream facing surface of the valve body, the upper end portion of the valve body is closer to the bottom portion than the lower end portion in a state where the protrusion is in contact with the bottom portion of the water channel, and the upper end portion of the valve body The flush gate according to any one of claims 1 to 5, further comprising a fall posture regulating mechanism in which an opening through which water can flow along the bottom surface of the water channel is formed between the lower end and the bottom of the water channel.

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