JP2017137633A - Water discharge facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable maintenance of outflow rate even when dusts accumulated on water inlet, and facilitate removal of the accumulated dust.SOLUTION: A water discharge facility of the present invention is installed on a dam body, and includes a water storage section for storing a part of water dammed by the dam body, and a water discharge channel for discharging the water dammed in the water storage section toward a downstream side of the dam body. The water storage section causes stored water flow over the dam body when the water storage volume exceeds a water storage capacity. The water discharge channel includes a water inlet for taking in water from the water storage section, an outlet for discharging the water taken in toward the downstream side of the dam body, and a cover for opening/closing the outlet. The cover opens the outlet when a pressure of water taken in is higher than a prescribed water pressure value, and closes the outlet when the water pressure is lower than a prescribed water pressure value.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a water discharge facility that is provided in a dam body such as a dam or a dyke and can discharge a predetermined amount downstream from the dam body.

  Conventionally, dams with dams (dam bodies) have been constructed for storing water and water names. This dam is provided with a discharge facility that can always discharge a predetermined amount in order to stably supply water downstream. As this discharge facility, the weir of Patent Document 1 is known.

  As shown in FIGS. 7A to 7C, for example, the weir 100 provided with this discharge facility includes a pair of floats 101 arranged in a water storage section W blocked by a bank body 100a, and the float 101. And a cylindrical water intake body 102 having a water intake port 103 and a cylindrical connection pipe 104 connected to the water discharge port 105 of the weir 100 and guiding the water intake body 102 in the vertical direction (for example, Patent Documents). 1).

  According to the weir with such a configuration, the position of the float 101 is moved up and down by the fluctuation of the water level in the flow path, and the position of the water intake body 102 is also moved up and down by the same distance. Therefore, there is no change in the relative position of the water intake 103 with respect to the water surface, and a certain amount of water discharge is maintained regardless of the change in the water level.

Patent Registration No. 2785721

  By the way, the dam 100 has a problem that when the dust adheres to the water intake 103 of the water intake body 102, the amount of water intake is reduced and the discharge flow rate cannot be maintained. In addition, there is a problem that the attached dust must be removed by a removal operation by a person.

  Therefore, in view of the above problems, the present invention provides a water discharge facility that can maintain a discharge flow rate even when dust is attached to a water intake, and can easily remove the attached dust. Objective.

  A water discharge facility according to the present invention is provided in a bank body and stores a part of the water blocked by the bank body, and a discharge that discharges the water stored in the water storage section downstream from the bank body And the water storage section is configured so that the water storage overflows from the embankment when the amount of stored water exceeds the storage capacity, and the discharge channel is a water intake for taking in the water of the water storage section. A water outlet that discharges the taken-in water to the downstream side of the dam body, and a lid configured to be able to open and close the water outlet, and the lid is provided when the water pressure taken from the water inlet is higher than a predetermined pressure. Is characterized in that it opens the water outlet and closes the water outlet when the pressure is lower than a predetermined pressure.

  According to this configuration, the lid that opens and closes the water discharge port of the discharge channel opens the water discharge port when the water pressure of the water taken in from the water intake port is higher than a predetermined pressure. Therefore, when no dust is attached to the water intake, the amount of water intake is secured, so that the water pressure applied to the lid becomes equal to or higher than the predetermined value, the water outlet is opened, and the discharge flow rate is maintained. On the other hand, when the water pressure taken from the water intake port is lower than the predetermined pressure, the lid closes the water discharge port. Therefore, if dust adheres to the water intake and the amount of water intake decreases, the water pressure applied to the lid decreases and the lid closes the water outlet. If it does so, since it will not be discharged from a water outlet, the water which accumulates in a water storage part will increase. And in a water storage part, if it exceeds the amount which can be stored, the water in a water storage part will be discharged to a downstream side exceeding a bank body (overflow will occur), and a discharge flow rate will be maintained.

  Here, when overflow occurs, a water flow different from the water flow by discharge through the discharge channel is generated in the reservoir. The dust adhering to the water intake is a thing adhering to the water intake by the flow of water by the discharge through the discharge channel. Therefore, when the flow of water in the water storage section changes from the flow of water through discharge through the discharge channel to the flow of water through overflow, the dust is removed from the water intake along the flow of water through overflow. If it does so, since the amount of water intake from a water intake will recover and increase, the water pressure concerning a lid will also recover and increase. Then, since the lid opens the water outlet, the discharge from the discharge channel is resumed.

  As one aspect of the present invention, the water storage section includes a downstream partition wall and an upstream partition wall, and is configured so that the water overflows from the downstream partition wall. The upstream partition wall has a dam body at its lower end. It is preferable to provide an inlet for drawing upstream water into the water reservoir.

  According to such a configuration, the flow of water in the water storage section when overflow occurs is an obliquely upward flow from the lower inlet of the upstream partition toward the upper side of the downstream partition. Therefore, the dust adhering to the water intake can be easily removed.

  As another aspect of the present invention, it is preferable that the water intake port is disposed away from the inner surface of the water storage portion toward the inner side.

  According to such a configuration, the water intake is disposed away from the inner surface of the water storage portion toward the inner side, and thus is exposed to the obliquely upward flow. Therefore, dust can be effectively removed.

  As another aspect of the present invention, the discharge channel includes a water intake body that has a water intake and is configured to be movable up and down in the water storage section, and a float that raises and lowers the water intake body in accordance with the amount of water stored in the water storage section. It is preferable that a plate for restricting the float to be lifted is attached to the side partition so that the float does not rise any further.

  According to such a configuration, the rise of the float is regulated by the plate, so that the water intake can be positioned at a predetermined height in the water reservoir. Therefore, it is possible to remove the dust attached effectively by the water flow obliquely upward in the water storage section at the time of overflow.

  As described above, according to the present invention, it is possible to maintain the discharge flow rate even when dust adheres to the water intake, and it is possible to easily remove the adhered dust. .

FIG. 1 is a diagram showing a water discharge facility according to an embodiment of the present invention. FIGS. 2A and 2B are views showing a lid that opens and closes the water outlet of the discharge channel of FIG. FIG. 3 is a diagram illustrating a state in which dust adheres to the water intake port and the water discharge port of the discharge channel is closed with a lid. FIG. 4 is a diagram showing a state where the water outlet of the discharge channel is closed with a lid, and the dust adhering to the water intake is removed. FIG. 5 is a diagram illustrating a usage mode of the water discharge facility, and is a diagram illustrating a state in which the water level of the water storage section dammed up by the bank body is full. FIG. 6 is a diagram illustrating a usage mode of the water discharge facility, and is a diagram illustrating a state in which the water level of the water storage section dammed up by the bank body is lowered. FIGS. 7A to 7C are diagrams showing a conventional weir for discharging water at a constant flow rate to the downstream side of the water channel.

  A water discharge facility according to an embodiment of the present invention will be described with reference to FIGS.

  A water discharge facility according to the present embodiment will be described. As shown in FIGS. 1 to 3, for example, the water discharge facility 1 is provided in a bank body 2 and stores a part of water blocked by the bank body 2, and a water storage section 3. And a discharge channel 4 for discharging the stored water downstream from the bank body 2.

  The water storage unit 3 is configured such that the stored water overflows from the dam body 2 when the amount of stored water exceeds the amount that can be stored. Specifically, the water storage unit 3 is configured such that the stored water overflows from a downstream partition wall 20 of the bank body 2 described later.

  The water reservoir 3 is provided with a recess formed in the upper part of the bank body 2. Specifically, the downstream partition 20 of the dam body 2 installed in a direction orthogonal to the direction of water flow, and extends from both ends of the downstream partition 20 toward the upstream side (water flow direction). The bottom of the levee body 2 that closes the opening of the bottom surface defined by the pair of side walls 21, 21 of the levee body 2, and the downstream partition wall 20 and the pair of side walls 21, 21. And an upstream partition wall 23 of the dam body 2 that closes an upper portion of an upstream opening defined by the wall 22, the downstream partition wall 20, the pair of side walls 21 and 21, and the bottom wall 22.

  An inlet 24 for drawing the water on the upstream side of the dam body 2 into the water reservoir 3 is provided at the lower end of the upstream partition wall 23. Specifically, the inflow port 24 is formed between the lower end portion of the upstream partition wall 23 and the upstream end portion of the bottom wall 22. Moreover, the net | network 25 which prevents inflow of the dust X is attached to the inflow port 24. FIG.

  A plate 26 that restricts the rise of the float 41 is attached to the upper end portion of the upstream partition wall 23 so that the float 41 of the discharge channel 4 to be described later does not rise any further.

  The plate 26 is formed with a through hole 260 having a size that allows the float 41 to be withdrawn and withdrawn. The upstream end 26 a of the plate 26 is attached to the end surface of the upper end of the upstream partition wall 23. Further, the downstream end 26b of the plate 26 is once bent in the vertical direction (upper side), and then the tip end side is bent in the horizontal direction. As a result, a gap (overflow port) H is formed between the lower surface of the tip and the end surface of the upper end of the downstream partition 20. This gap H is for discharging the dust X attached to the screen 402 attached to the water intake port 401 to the downstream side in a state where a water discharge port 422a of the discharge main tube 421 described later is closed by the lid 43. .

  The discharge channel 4 includes a water intake body 40 configured to be movable up and down in the water storage unit 3, a float 41 that raises and lowers the water intake body 40 according to the amount of water stored in the water storage unit 3, and discharges water from the water storage unit 3 to the downstream side. And a lid 43 configured to be capable of opening and closing the water outlet 421a.

  The water intake body 40 is cylindrical and is inserted so as to be movable up and down with respect to a connection pipe 420 of a discharge pipe 42 described later. In addition, the water intake body 40 is disposed at the connection portion 400 connected to the lower end of the float 41, the intake port 401 provided at a predetermined distance from the connection portion 400, and the intake port 401. A screen 402 for preventing the inflow of the dust X into the intake body 40 through the first, a first regulating body 403 for regulating a lower limit position in the vertical movement of the intake body 40, and an upper limit in the vertical movement of the intake body 40 A second restricting body 404 for restricting the position.

  The water intake 401 is arranged farther to the inner side than the inner surface of the water storage unit 3. Specifically, the float 41, the water intake body 40, the discharge pipe 42, and the like are disposed between the downstream partition 20 and the upstream partition 23.

  The float 41 is disposed in the water reservoir 3 defined by the downstream partition 20, the pair of side walls 21, 21, the bottom wall 22, and the upstream partition 23. Moreover, the float 41 is hemispherical and has an annular stopper 410 attached thereto. The stopper 410 abuts on the opening peripheral edge of the through hole 260 of the plate 26 and prevents the float 41 from coming out of the through hole 260.

  The discharge pipe 42 extends in the vertical direction and has a cylindrical connection pipe 420 that guides the water intake body 40 in the vertical direction. One end of the discharge pipe 42 is connected to the connection pipe 420 and the other end has a water discharge port 421a. The main discharge pipe 421 is provided.

  An annular locking portion 420 a that locks to the second restricting body 404 of the water intake body 40 is formed at the peripheral edge portion of the upper end opening of the connection pipe 420.

  One end of the discharge main pipe 421 extends in the vertical direction and is connected to the connection pipe 420, the other end extends in the horizontal direction, and the water discharge port 421a for discharging the water in the water storage section 3 to the downstream side. Is provided.

  The lid | cover 43 is comprised so that it may open with a hydraulic pressure with respect to the water outlet 421a of the discharge main pipe 421. FIG. Specifically, the water outlet 422a is opened when the water pressure taken from the water inlet 401 is higher than a predetermined pressure, and the water outlet 421a is closed when the water pressure is lower than the predetermined pressure. In addition, the lid 43 is in a disk shape in this embodiment, and a packing P is attached to the opening peripheral edge of the water outlet 421a of the discharge main pipe 421, and the water outlet 421a is sealed by the lid 43. The

  Next, a usage aspect of the water discharge facility according to the present embodiment will be described. First, the state of FIG. 1 is a state where water from the upstream side flows into the water storage unit 3 and is full, the float 41 protrudes from the through hole 260 of the plate 26, and the water of the water storage unit 3 is connected to the water intake body 40. Water is discharged from the water discharge port 421a of the discharge main pipe 421 through the pipe 420.

  At this time, the stopper 410 of the float 41 is brought into contact with the peripheral portion of the through hole 260 of the plate 26, and the second restricting body 404 is locked to the locking portion 420 a of the upper end opening of the connection pipe 420. Further, the lid 43 is pushed open by the water pressure of the water passing through the water intake body 40, the connecting pipe 420 and the discharge main pipe 421.

  When the water in the water storage unit 3 decreases from this state, the water in the water storage unit 3 is discharged from the water intake body (connection pipe 420) 40 and the water discharge port 421a of the discharge main pipe 421 as shown in FIG.

  At this time, the float 41 is retracted from the through hole 260 of the plate 26, and the first regulating body 403 of the water intake body 40 comes into contact with the engaging portion 420 a of the upper end opening of the connection pipe 420, and the connection pipe 420 and the discharge main pipe 421. The lid 43 is pushed open by the water pressure passing through.

  That is, even if the water level of the water storage unit 3 changes, the distance from the water surface of the water storage unit 3 to the water intake 401 is constant, and a constant flow of water (maintenance flow rate) is discharged from the water intake 401 to the downstream side. Become.

  Next, as shown in FIG. 5, when the dust X adheres (deposits) to the water intake port 401, the water pressure of the water taken in from the water intake port 401 becomes lower than a predetermined pressure, and the lid 43 closes the water discharge port 421a. If it does so, since it will no longer be discharged from the water discharge port 421a, the water which accumulates in the water storage part 3 will increase. And in the water storage part 3, if it exceeds the amount which can be stored, the water in the water storage part 3 will be discharged to the downstream side over the downstream partition 20 of the dam body 2 (overflow will occur), and the discharge flow rate will be maintained. .

  Here, when overflow occurs, a water flow different from the water flow by discharge through the discharge flow path 4 is generated in the water storage section 3. That is, the dust X adhering to the water intake 401 is a thing adhering to the water intake 401 by the flow of the water by the discharge through the discharge flow path 4. Therefore, when the flow of water in the water storage section 3 changes from the flow of water through discharge through the discharge flow path 4 to the flow of water through overflow, the dust X follows the water flow due to overflow and has a water intake port 401. Removed from. If it does so, since the water intake amount from the water intake 401 will recover and increase, the water pressure concerning the lid | cover 43 will also recover and increase. Then, since the lid 43 opens the water outlet 421a, the discharge from the discharge channel 4 is resumed.

  Specifically, the flow of water in the water storage section 3 when overflow is occurring is an obliquely upward flow from the lower inlet 24 of the upstream partition 23 toward the upper side of the downstream partition 20. . The intake port 401 is disposed at a position that receives this obliquely upward flow.

  That is, since the water intake 401 is arranged away from the inner surface of the water storage unit 3 toward the inner side, it is exposed to the obliquely upward flow. Therefore, the dust X adhering to the water intake port 401 can be effectively removed.

  Thus, according to the water discharge facility according to the present embodiment, the dust X attached to the water intake 401 of the water intake body 40 can be easily removed.

  It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made without departing from the gist of the present invention.

  For example, in the case of the above-described embodiment, the discharge pipe 42 is formed downward from the bottom wall 22 of the water reservoir 3, but is not limited thereto, and may be formed downstream from the downstream partition 20. Alternatively, the side wall 21 may be formed laterally.

  Moreover, in the case of the said embodiment, the water intake 401 is not restricted to the case where it is arrange | positioned away from the inner surface of the water storage part 3, The inner surface (For example, the surface of the bottom wall 22, the surface of the downstream partition 20, You may provide in the surface of the side wall 21).

  Moreover, in the case of the said embodiment, although the water intake body 40 was made into the raising / lowering type, not only this but a fixed type may be sufficient. In the case of the fixed type, the float 41 is not necessary.

  Moreover, in the case of the said embodiment, as a structure which opens and closes the water discharge port 421a, it is comprised so that the lid | cover 43 may be rotated in an opening direction by dead weight, and the lid | cover 43 may be rotated in the opening direction by the water pressure more than the predetermined pressure by water discharge. Although it was set as the structure hold | maintained, it is not restricted to this, It is comprised so that the lid | cover 43 may be rotated in a closing direction with dead weight, The holding | maintenance mechanism which hold | maintains this lid | cover 43 in an open state, and the water pressure sensor which detects the water pressure And a control unit that releases the holding of the holding mechanism when the detected water pressure is lower than a predetermined pressure.

  In the above embodiment, the lid 43 of the discharge main pipe 421 is opened and closed only by water pressure. However, the lid 43 may be opened and closed by an elastic member that urges the lid 43 in the closing direction. It may be.

  Moreover, in the case of the said embodiment, although the water intake body 40 was comprised so that raising / lowering was possible, it can also be comprised so that rotation around an up-down axis line is possible. In this case, the dust can be effectively removed because it is rotated by the water flow obliquely upward at the time of overflow.

  Moreover, in the case of the said embodiment, although the inflow port 24 of the dam body 2 was provided under the upstream partition 23, you may provide not only in this but in an upper end part and an intermediate part. Moreover, you may provide in two places, an intermediate part and a lower end part.

  Moreover, in the case of the said embodiment, although the water storage part 3 formed the recessed part in the upper part of the dam body 2, it does not restrict to this, Even if it provides a water storage part using the upstream side surface of the dam body 2 Good. For example, a pair of side walls projecting from the upstream side surface to the upstream side and a wall connecting the pair of side walls constitute a water reservoir. In this case, the top and bottom are opened, the bottom opening is used as an inlet, a water intake is disposed in the vicinity of the inlet, and dust is removed by the water flow from the inlet to the upper opening.

  In the case of the above embodiment, the dam body is described as an example, but a dam body may be used.

  In the embodiment, the “predetermined water pressure” refers to a water pressure in the vicinity of the water discharge port 421a when the discharge flow rate from the water discharge port 421a of the discharge main pipe 421 is a predetermined amount.

  DESCRIPTION OF SYMBOLS 1 ... Water discharge equipment, 2 ... Dam body, 20 ... Downstream partition, 21 ... Side wall, 22 ... Bottom wall, 23 ... Upstream partition, 24 ... Inlet, 25 ... Net, 26 ... Plate, 260 ... Through-hole, 3 DESCRIPTION OF REFERENCE SYMBOLS: Water storage part, 4 ... Release channel, 40 ... Water intake body, 400 ... Connection part, 401 ... Water intake port, 402 ... Screen, 403 ... 1st control body, 404 ... 2nd control body, 41 ... Float, 410 ... Stopper, 42 ... Discharge pipe, 420 ... Connection pipe, 420a ... Locking part, 421 ... Discharge main pipe, 421a ... Discharge port, 43 ... Cover, P ... Packing, H ... Gap, X ... Dust

Claims (4)

A water storage part that is provided in the bank body and stores a part of the water blocked by the bank body, and a discharge channel that discharges the water stored in the water storage part downstream from the bank body,
The water reservoir is configured so that when the amount of stored water exceeds the amount that can be stored, the stored water will overflow the dam body,
The discharge channel includes a water intake port for taking in water from the water reservoir, a water discharge port for discharging the taken water to the downstream side of the dam body,
A lid configured to be able to open and close the water outlet,
The lid is configured to open the water outlet when the water pressure taken from the water inlet is higher than a predetermined pressure, and to close the water outlet when lower than the predetermined pressure. Facility.   The water storage section includes a downstream partition wall and an upstream partition wall, and is configured so that the water overflows from the downstream partition wall. The upstream partition wall contains water on the upstream side of the dam body at the lower end thereof. The water discharge facility according to claim 1, further comprising an inflow port for drawing into the water.   The water discharge facility according to claim 2, wherein the water intake is arranged to be separated from the inner surface of the water storage portion toward the inner side. The discharge channel includes a water intake body that has a water intake and is configured to be movable up and down in the water storage section, and a float that raises and lowers the water intake body according to the amount of water stored in the water storage section.
The water discharge facility according to claim 2 or 3, wherein a plate that regulates the rise of the float is attached to the upper end partition so that the float does not rise any further.

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