JPH11222835A - Weir device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To close a weir device when a water level on the upstream side rises without another power source and divert water to a tailrace while opening the weir device when the water level on the upstream side lowers and stopping diversion. SOLUTION: A waterway is changed at the time of swelling and water is diverted to a tailrace W2 in the weir device 1. The weir device is composed of a movable weir 3 crossed over the waterway W1 and installed in a manner that the movable weir 3 can be opened and closed and a fixed weir 2 mounted on at least one revetment wall W3 of the waterway W1 on the upstream side of the movable weir 3 and continued to the tailrace W2, and a weir open-close mechanism 4 opening the movable weir 3 when a water level in the waterway W1 does not exceed the fixed weir 2 and closing the movable weir 3 under the state, in which the water level in the waterway W1 exceeds the fixed weir 2, is set up at that time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weir device provided so as to cross a water channel and which can be used for switching a water channel when increasing water.

[0002]

2. Description of the Related Art Conventionally, an opening / closing gate which is provided so as to be openable and closable so as to cross a waterway, a float chamber which is provided along the waterway and into which water in the waterway is introduced over an upper edge portion, and 2. Description of the Related Art There is known a dam device that includes a float disposed in a float chamber and an interlocking mechanism that opens and closes the opening / closing gate in accordance with lifting and lowering of the float. Such a weir device is configured such that, when water flows into the float chamber beyond the upper edge due to an increase in the water volume of the water channel, the opening degree of the opening / closing gate increases in conjunction with the rise of the float due to the rise in the water level in the float chamber. Has become.

Therefore, when the water level in the water channel on the upstream side of the weir device is low, the opening / closing gate is automatically closed and the water is blocked, so that the water level on the upstream side rises, and this water level rises to the upper edge of the float chamber. The gate will open automatically when you exceed
The dammed water is released and the water level drops. Such an automatic opening / closing operation without using the power of the opening / closing gate can keep the water level on the upstream side of the weir device within a predetermined range, and the opening / closing gate is normally opened when water is increased due to rainfall or the like. In addition, the water flows through the water channel without being blocked by the weir device, thereby avoiding inconvenience such as breakage of the ridge on the upstream side of the weir device.

[0004]

By the way, in the conventional weir device as described above, the open / close gate is closed when the water level on the upstream side of the weir device decreases, and when the water level rises. Because it is open to the, when the water level on the upstream side rises above a predetermined water level, it has the disadvantage that it cannot be applied to applications such as blocking the water and switching the flow path I have. However, the above uses include automatically switching the fishway according to the water level of the waterway, diverting the water of the main river according to the water level, or preventing flooding of the main river by switching the flow path. Uses that can be used.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned inconvenience, and when the water level on the upstream side rises, it is closed and can be separated into another water channel. It is an object of the present invention to provide a weir device that can be opened when the water is lowered to stop the water distribution.

[0006]

A weir device according to a first aspect of the present invention is a weir device that changes a water channel when water is increased and diverts the water to a water discharge channel, and is provided to be openable and closable across the water channel. A movable weir, and a fixed weir provided as an upstream end of the water discharge channel on at least one of the banks of the water channel on the upstream side of the movable weir, and when the water level in the water channel does not exceed the fixed weir, the above A weir opening / closing mechanism is provided for opening the movable weir and closing the movable weir when the water channel is at a water level exceeding the fixed weir.

According to this weir device, when the water level on the upstream side of the movable weir in the water channel exceeds the water level of the fixed weir, the opened movable weir is closed by the operation of the weir opening / closing mechanism, thereby the upstream of the movable weir. The entire amount of the water in the waterway on the side is blocked and discharged to the water discharge channel beyond the fixed weir.On the other hand, when the water volume of the movable weir decreases and falls below the fixed weir, the movable weir is activated by the operation of the weir opening and closing mechanism. It is opened and flows down the waterway through the movable weir without being discharged to the waterway.

[0008] As described above, the movable weir is closed when the amount of water on the upstream side increases against the conventional common sense, and the water on the upstream side is discharged to the water discharge channel. When the water level on the side rises above the predetermined water level, the water is blocked and the flow path is switched, that is, the fishway is automatically switched according to the water level of the waterway, or the water is divided according to the water level. The application can be applied. Also,
It can be applied to the operation of switching the channel to the spillway to prevent flooding of the main river at the time of flooding.

According to a second aspect of the present invention, there is provided the weir device according to the first aspect, wherein the weir opening / closing mechanism includes a reservoir chamber provided on at least one side of the movable weir, A float disposed in the chamber, and a connecting means for connecting the float and the movable weir to open and close the movable weir in accordance with the elevation of the float,
In the reservoir chamber, the upper edge facing the water channel on the upstream side of the movable wall is set to a height substantially equal to the level of the fixed weir, and the drain is drained to the bottom at the downstream side of the movable weir. Characterized by having small holes for use.

According to this weir device, when the water level on the upstream side of the weir device is lower than the upper edge of the reservoir, the reservoir is empty without water being introduced. ,
The float is lowered to the lowest level in the sump chamber, whereby the weir device is opened via the connection means and the water in the water channel flows down through the weir device.

When the water volume in the water channel increases and the water level on the upstream side of the weir device exceeds the upper edge of the reservoir, the excess water is introduced into the reservoir, and the amount of the introduced water is reduced from the small holes. Above the discharge of water, the water level in the sump chamber rises,
As a result, the rise of the float closes the weir device and prevents the water from flowing down the water channel on the upstream side, whereby the water on the upstream side is discharged to the water discharge channel over the fixed weir.

If the water level on the upstream side drops once the weir device is closed and water is no longer supplied into the reservoir chamber, the water in the reservoir chamber is discharged from the small hole to the downstream side of the water channel. Float falls due to the drop in water level,
As a result, the weir device is opened via the connecting means, and the water on the upstream side flows down the water channel.

According to a third aspect of the present invention, there is provided the weir device according to the second aspect, wherein the movable weir comprises a rotating shaft extending in a direction crossing the water channel, and a rotatable shaft around the rotating shaft. It is configured to include a supported gate arm and an opening / closing gate provided at a distal end side of the gate arm so as to cross the water channel, and the connecting means is provided upright between the gate arm and the float. And a fulcrum shaft provided on the top of the support and extending in a direction transverse to the waterway,
A swinging rod rotatably supported about the fulcrum axis, an upstream rope connecting the upstream end of the swinging rod and the float, and a downstream end of the swinging rod. And a downstream rope connected to the gate arm, wherein a moment about the fulcrum axis of the float as a fulcrum is set larger than a moment about the fulcrum axis of the gate arm as a fulcrum. It is assumed that.

According to this weir device, when the water level in the reservoir chamber rises, the float rises, and the swinging rod rotates around the fulcrum axis via the upstream rope in accordance with the rise of the float. Then, the open / close gate suspended on the downstream rope turns around the rotation axis by its own weight and descends, so that the water channel is closed by the gate arm. Conversely, when the water level in the reservoir chamber falls, the float having a large moment descends, whereby the upstream end of the swinging rod is pulled down by the upstream rope, thereby causing the swinging rod to rotate in reverse around the fulcrum axis. The opening / closing gate is lifted by the downstream rope, and the opening / closing gate is rotated around the rotation axis and opened.

As described above, a so-called radial gate which is rotatable around a rotation axis is used as a movable weir.
The opening and closing gate is opened and closed by turning the swinging rod around the fulcrum axis in accordance with the lifting and lowering of the float, so that the opening and closing gate can be reliably opened and closed according to the amount of water in the water channel with a simple structure. It becomes possible.

[0016]

1 and 2 are partially cutaway perspective views showing an embodiment of a weir device according to the present invention. FIG. 1 shows a state in which an open / close gate is opened, and FIG. 2 shows an open / close state. Each shows a state where the gate is closed. FIG. 3 shows FIG.
It is sectional drawing of the side view of FIG. 1 and 2, the XX direction is referred to as a width direction, the YY direction is referred to as a front-rear direction, and in particular, the -X direction is leftward, the + X direction is rightward, the -Y direction is upstream, the + Y direction. Is called the downstream direction.

As shown in these figures, the weir device 1 of the present invention is used for changing the water channel at the time of increasing water and allowing water to escape to the water discharge channel, and the discharge device branched from the water channel W1 which is the main river. Fixed weir 2 provided in waterway W2, and fixed weir 2
And a movable weir 3 that can be opened and closed across the water channel W1 on the downstream side of the
Is to open the movable weir 3 when the water level in the water channel W1 does not exceed the fixed weir 2, and to close the movable weir 3 in a state where the water level in the water channel W1 exceeds the fixed weir 2. Has become.

The waterway W1 is protected on both sides by a concrete revetment wall W3 to secure the width of the waterway, and is located upstream of the movable weir 3 on one of the revetment walls W3 (the left bank side in the embodiment shown in FIG. 1). Is provided with a fixed weir 2 whose top level is lower than that of the revetment wall W3, and a water discharge channel W2 continues downstream of the fixed weir 2. And the waterway W1
When the water level exceeds the fixed weir 2 and the movable weir 3 is closed, the total amount of water in the water passage W1 upstream of the movable weir 3 is changed and the water is discharged toward the water discharge passage W2. .

At the position of the waterway W1 where the movable weir 3 is provided, there is provided a floodgate W4 bridged between the revetment walls W3. The floodgate W4 has an upper edge which is the same height as the revetment wall W3 and is set to be a bell, and a lower edge portion is provided apart from the bottom of the waterway W1. A water passage W5 opened substantially over the entire length between the revetment walls W3 is formed. In addition, a step portion is provided on the downstream side of the water passage W5 so that the bottom of the water passage W1 is lowered by one step, so that the water of the water passage W1 that dives below the water passage W5 forms a small waterfall at the step portion and falls. After that, it goes to the downstream side.

The movable weir 3 comprises a weir opening / closing mechanism 4 which operates according to the water level in the water channel W1 and an opening / closing gate 5 which opens / closes by the operation of the weir opening / closing mechanism 4.

The weir opening / closing mechanism 4 includes a reservoir chamber 41 provided on both sides in the width direction of the weir opening / closing mechanism 4, a float 42 disposed in the reservoir chamber 41, and a lifting / lowering of the float 42. And a connecting means 43 for connecting the float 42 and the movable weir 3 so as to open and close the movable weir 3 in accordance with the condition.

The float 42 has a hollow metal cube formed of stainless steel or the like, and has an apparent specific gravity smaller than that of water, so that the float 42 can float on water with a predetermined buoyancy. Is formed.

The reservoir chamber 41 is surrounded by a U-shaped retaining wall 41a extending in opposite directions from the left and right revetment walls W3 slightly upstream and downstream of the floodgate W4. Is formed. The connecting means 43 is provided inside the retaining wall 41a.

The water gate W in the reservoir chamber 41
A pair of upper and lower water intakes 31 are opened in the upper and lower portions of the revetment wall W3 on the upstream side of 4, and water is introduced from these intakes 31 into the reservoir chamber 41 when the water channel W1 is increased. I have. Further, the sluice W in the reservoir chamber 41
4, a drain port 32 composed of a small hole is provided in the channel W1.
Drilled towards.

The opening area of the drain port 32 is the same as that of the intake port 3.
1 is set to be sufficiently smaller than the opening area, and when a large amount of water flows in from the intake port 31 at the time of increasing water, the amount of water flowing out from the drain port 32 is small, so that the reservoir chamber 41 is filled with water. At the same time, when the water level on the upstream side is lower than the intake 31, the water in the reservoir chamber 41 is discharged into the water channel W1 on the downstream side of the gate W4 through the drainage port 32, whereby the reservoir chamber The water level in 41 is set to match the water level in water channel W1 downstream of floodgate W4.

The float 42 is immersed in water so that even if the water level in the reservoir chamber 41 reaches the same level as the water level in the downstream water passage W1, no buoyancy for floating the float 42 is generated. The apparent specific gravity of the part is larger than that of water.

The upper intake port 31 is set to a height substantially equal to the level of the fixed weir 2, so that the water level of the water channel W 1 on the upstream side of the floodgate W 4 is higher than the upper edge of the fixed weir 2. At the time of increased water, the water in the water channel W1 overflows the fixed weir 2 and is discharged to the water discharge channel W2, and a part of the water is introduced into the reservoir chamber 41 through the water intake 31. .

The connecting means 43 is connected to each of the reservoir chambers 41.
A pair of columns 44 in the width direction erected on the inner floor plate, and a pivot provided on the top of the columns 44 and rotatably supported about a fulcrum shaft 45a extending in a direction crossing the water channel W1. A rod 45, an upstream rope 46a connecting the upstream end of the swinging rod 45 to the float 42, and a downstream side connecting the downstream end of the swinging rod 45 to the sleeve 5; And a pool 46b.
The opening / closing gate 5 is closed and opened by the vertical movement of the ropes 46a and 46b in accordance with the lifting and lowering of the float 42 due to the inflow and outflow of water into the inside and the forward / reverse rotation of the swinging rod 45 around the fulcrum shaft 45a. I have.

The fulcrum shaft 45a is provided so as to penetrate a bifurcated bracket 44a attached to the top of the support column 44 in the width direction, and the oscillating rod 45 is held between the brackets 44a. It swings around.

On the other hand, the opening / closing gate 5 has a gate body 51 having an arc shape in a side view and a rotation center of the gate body 51 passing through the revetment wall W3 at a lower portion on the downstream side of the reservoir chamber 41. A pair of rotating shafts 52 in a width direction that can be sea-routed around the center axis, and a width direction in which a base end side is connected to the rotating shaft 52 on the water channel W1 side so as to be corotatable and a distal end side is fixed to the gate main body 51. A pair of gate arms 53,
On the side of the reservoir chamber 41, a base end is connected to the rotation shaft 52 so as to be able to rotate together with the rotation shaft 52, and a distal end is provided with a connection arm 54 connected to a lower end of the downstream rope 46b.

As shown in FIG. 3, the chord dimension L1 of the arc is the same as the vertical dimension L2 of the water passage W5.
(Dimension between the lower end surface of the floodgate W4 and the bottom surface of the waterway W1 on the downstream side of the floodgate W4), and the elasticity of polytetrafluoroethylene or the like is provided on both edges in the width direction. A tough and strong synthetic resin sealing material 51a is attached. Each seal member 51a is dimensioned so as to be in sliding contact with the surface of the facing revetment wall W3, thereby preventing leakage of water from both sides of the gate main body 51.

On the other hand, the floodgate W4 has a triangular shape as viewed from the side on the downstream surface of the lower end, and extends over the entire length of the floodgate W4 in the width direction. have. The seal ridge W4a is dimensioned such that a vertex of a triangle in a side view contacts the upstream surface of the gate body 51. Therefore, as shown by a two-dot chain line in FIG.
1, when the sealing members 51a on both sides of the gate body 51 are in contact with the revetment wall W3,
Further, since the sealing ridge W4a of the gate W4 is in contact with the surface on the upstream side of the gate body 51, the blocked water on the upstream side of the gate W4 does not leak to the downstream side.

In the present invention, the moment of the float 42 about the fulcrum shaft 45a as a fulcrum is set to be larger than the moment of the gate arm about the fulcrum shaft 45a as a fulcrum.

More specifically, as shown in FIG. 3, the weight of the float 42 is G1, and the water level in the reservoir chamber 41 is the water gate W.
F, the buoyancy applied to the float 42 when the water level is the same as the water level of the water channel W1 downstream of 4, the weight of the opening / closing gate 5, G2, the horizontal distance between the fulcrum shaft 45a and the upstream rope 46a, d1, The horizontal distance between the fulcrum shaft 45a and the downstream rope 46b is d2, the horizontal distance between the rotation shaft 52 and the center of gravity O of the opening / closing gate 5 is d3, and the horizontal distance between the rotation shaft 52 and the downstream rope 46b. Is d4, (W1-F) × d1> (W2 × (d3 / d4)) × d2 so that the weights G1 and G2 of the float 42 and the opening / closing gate 5 and the length dimension of the swinging rod 45 are satisfied. , The position of the center of gravity of the opening / closing gate 5 and the like are respectively set. In this formula, the buoyancy applied to the opening / closing gate 5 is so small that it can be ignored.

Accordingly, when there is no water in the reservoir chamber 41, the value of the moment on the float 42 side is larger than the value of the moment on the opening / closing gate 5, so that the float 42 is lowered as shown in FIG. As a result, the swinging rod 45 is pulled by the upstream rope 46a and rotates counterclockwise around the fulcrum shaft 45a. With this rotation, the connecting arm 54 is pulled by the downstream rope 46b and rotates around the rotation shaft 52. To rotate clockwise. The rotation of the rotation shaft 52 about its own axis causes the gate body 51 to rotate clockwise around the rotation shaft 52 through the gate arm 53 as shown in FIG. The water port W5 is in an open state.

Next, when water is introduced into the reservoir chamber 41, the float 42 rises by buoyancy and the upstream rope 46a is slackened, so that the opening / closing gate 5 is moved counterclockwise around the rotating shaft 52 by its own weight. As a result, the water passage W5 is closed by the gate body 51, as shown in FIG.

FIGS. 4A and 4B are explanatory diagrams for explaining the operation of the present invention. FIG. 4A shows a state in which the water level of the water channel W1 is lower than that of the upper intake port 31, and FIG. Respectively show a state higher than the water intake 31.

First, the water level of the water channel W1 is changed to the lower intake port 31.
When it is lower, as shown in FIG. 4A, the water upstream of the water gate W4 does not enter the reservoir chamber 41 from the lower intake port 31, so that the drain port is provided in the reservoir chamber 41. Through 32, water downstream of the floodgate W4 is introduced.

As a result, the water level in the reservoir chamber 41 is at the same level as the water level of the water channel W1 downstream of the floodgate W4, but the float 42 is designed so that the float does not generate enough buoyancy at this water level. As a result, the float 42 is in a state of being set at the lowest position, whereby the upstream end of the swinging rod 45 is pulled downward via the upstream rope 46a and the downstream end is Springs upward and the downstream rope 46b is pulled up, whereby the water passage W5 is opened by the clockwise rotation of the gate main body 51 around the rotation axis 52 via the connection arm 54, the rotation axis 52 and the gate arm 53. In this state, the water upstream of the sluice W4 flows downstream through the water inlet W5.

Then, when the water level of the water channel W1 upstream of the floodgate W4 rises and crosses the upper intake port 31, as shown in FIG. , Whereby the water level in the reservoir chamber 41 rises. Then, when the water level in the reservoir chamber 41 rises, the float 42 rises due to the buoyancy acting on it, thereby releasing the tension applied to the upstream rope 46a. The downstream rope 46b is rotated clockwise and descends,
When the opening / closing gate 5 rotates counterclockwise around the rotation axis 52 by its own weight, as shown in FIG.
The water inlet W5 of the sluice W4 is closed by the gate body 51.

When the water inlet W5 is closed, the water level of the water channel W1 on the upstream side of the water gate W4 rises, and the rising water is discharged to the water discharge channel W2, whereby the water level of the water channel W1 is equal to or higher than the predetermined water level. State, that is, the upper intake 3
When the water level exceeds 1, the water is automatically divided into the water discharge channel W2.

When the water level of the water channel W1 upstream of the sluice W4 falls below the lower intake port 31, the water is supplied to the intake port 31.
From the reservoir water 41, the water in the reservoir water chamber 41 is drained into the downstream water channel W1 through the drain port 32, and the water level is reduced by the water level.
2, the gate main body 51 rotates clockwise around the rotation axis 52, and the water inlet W5 is opened. And water inlet W
By opening 5, the water upstream of the floodgate W4 flows down through the water inlet W5, as shown in FIG.

According to the present invention, as described in detail above, weir device 1
A movable weir 3 that can be opened and closed across the water channel W1.
And a fixed weir 2 provided on the revetment wall W3 on the upstream side of the movable weir 3 and continuing from the water discharge channel W2.
When the water level does not exceed the fixed weir 2, the water intake 3
When the water level is lower than 1, the movable weir 3 is opened, and a weir opening / closing mechanism 4 for closing the movable weir 3 in a state where the inside of the water channel W1 is higher than the water intake port 31, that is, higher than the water intake port 31 is provided. When the water level on the upstream side of the movable weir 3 in W1 exceeds the water level of the fixed weir 2, the movable weir 3 which has been opened is closed by the operation of the weir opening / closing mechanism 4, whereby the movable weir 3
The water in the water channel W1 on the upstream side of the
Water is discharged toward the water discharge channel W2 over the
When the water volume decreases below the fixed weir 2, the movable weir 3 is opened by the operation of the weir opening / closing mechanism 4, and the water channel W1 can flow down through the movable weir 3 without being discharged to the water discharge channel W2. .

As described above, the movable weir 3 is closed to discharge the water on the upstream side to the water discharge channel W2 when the amount of water on the upstream side increases, contrary to the conventional common sense. 1 can be applied to applications such as blocking the water and switching the flow path when the water level on the upstream side rises above a predetermined water level. Such uses include automatically switching the fishway according to the water level of the waterway W1, separating the water according to the water level, and further discharging the waterway to prevent flooding of the main river when the water level increases. Water discharge treatment to W2 and the like can be mentioned.

The present invention is not limited to the above embodiment, but includes the following contents.

(1) In the above-mentioned embodiment, the so-called radial type of opening / closing gate 5 is used, in which the gate main body 51 rotates forward and reverse around the rotation axis 52 to open and close the water passage W5. However, the present invention is not limited to the opening and closing gate 5 being of a radial type, but may be of an elevating type in which the gate body is moved up and down in a vertical direction, or in a width direction provided at a lower edge portion of the gate body. An undulating method that undulates around a horizontal axis that extends may be used.

(2) In the above embodiment, the support 4
The swinging rod 45 swinging around the fulcrum shaft 45a is provided at the top of the four. A pulley that rotates forward and backward around the fulcrum shaft 45a is provided in place of the swinging rod 45, and a rope is wound around the pulley. You may.

(3) In the above embodiment, the reservoir chambers 41 are provided on both sides of the water channel W1. However, the present invention is not limited to the case where the reservoir chambers 41 are provided as a pair of left and right. Instead, it may be provided only on one side.

(4) In the above embodiment, the water discharge channel W2 is formed on one revetment wall W3 of the water channel W1, but the present invention is limited to the case where the water discharge channel W2 is provided only on one revetment wall W3. Instead, it may be provided on both revetment walls W3.

[0050]

According to the weir device of the first aspect of the present invention, the weir device includes a movable weir provided to be openable and closable across the water channel, and at least one of a water channel upstream of the movable weir. It is composed of a fixed weir provided as the upstream end of the water discharge channel on the dike, and when the water level in the water channel does not exceed the fixed weir, the movable weir is opened, and the water channel reaches the water level exceeding the fixed weir. Since the weir opening / closing mechanism for closing the movable weir is provided, when the water level on the upstream side of the movable weir in the water channel exceeds the water level of the fixed weir, the opened movable weir is closed by the operation of the weir opening / closing mechanism. The water in the upstream canal is discharged to the drainage channel over the fixed weir, while the movable weir drops below the fixed weir when the movable dam falls below the fixed weir. Movable weir opened by actuation without being discharged into the tailrace It can be made to flow waterways through.

As described above, the movable weir is closed to discharge the water on the upstream side to the water discharge channel when the amount of water on the upstream side increases, contrary to the conventional common sense. When the water level on the side rises above the predetermined water level, the water is blocked and the flow path is switched, that is, the fishway is automatically switched according to the water level of the waterway, or the water is divided according to the water level. The application can be applied. Also,
It can be applied to the water discharge operation to the flood channel to prevent the flood of the main river at the time of flooding.

According to the weir device of the second aspect of the present invention,
A weir opening / closing mechanism comprising: a reservoir provided on at least one side of the movable weir; a float disposed in the reservoir; and a float and a movable weir configured to open and close the movable weir in accordance with the elevation of the float. And a connecting means for connecting the upper portion of the movable wall of the reservoir chamber facing the water channel on the upstream side, and the height thereof is set to substantially the same level as the fixed weir,
Since a small hole for draining water is provided at the bottom on the downstream side of the movable weir, when the water level on the upstream side of the weir device is lower than the upper edge of the reservoir, the water is stored in the reservoir. Is emptied without being introduced, and the float is lowered to the lowest position in the reservoir chamber, whereby the weir device is opened via the connecting means and the water in the water channel flows down through the weir device. Can be done.

When the water volume of the water channel increases and the water level on the upstream side of the weir device exceeds the upper edge of the reservoir, the excess water is introduced into the reservoir, and the amount of the introduced water is reduced from the small hole. Above the discharge of water, the water level in the sump chamber rises,
As a result, the rise of the float closes the weir device and prevents the water from flowing down the water channel on the upstream side, whereby the water on the upstream side can be discharged to the water discharge channel over the fixed weir.

If the water level on the upstream side drops once the weir device is closed and water is no longer supplied into the reservoir, water in the reservoir is discharged from the small hole to the downstream side of the water channel. Float falls due to the drop in water level,
Thereby, the weir device is opened via the connecting means, and the water on the upstream side can flow down along the water channel.

According to the weir device of the third aspect of the present invention,
A movable weir, a rotating shaft extending in a direction crossing the water channel, a gate arm rotatably supported around the rotating shaft, and an opening / closing gate provided at a distal end side of the gate arm so as to cross the water channel. The connecting means comprises: a support erected between the gate arm and the float; a fulcrum shaft provided on the top of the support and extending in a direction transverse to the water channel; A swinging rod pivotally supported,
An upstream rope connecting the upstream end of the swinging rod and the float, and a downstream rope connecting the downstream end of the swinging rod and the gate arm are connected to each other. Since the moment at the fulcrum is set to be larger than the moment at the fulcrum axis of the gate arm, when the water level in the reservoir chamber rises, the float rises up. As a result, the swinging rod pivots around the fulcrum axis, and the open / close gate suspended by the downstream rope pivots about its rotation axis and descends by its own weight, whereby the water channel is closed by the gate arm. Conversely, when the water level in the reservoir chamber falls, the float having a large moment descends, whereby the upstream end of the swinging rod is pulled down by the upstream rope, thereby causing the swinging rod to rotate in reverse around the fulcrum axis. Thus, the opening / closing gate is pulled up by the downstream rope, and the opening / closing gate can be rotated around the rotation axis to be opened.

As described above, a so-called radial gate which is rotatable around a rotation axis is used as a movable weir.
The opening and closing gate is opened and closed by turning the swinging rod around the fulcrum axis in accordance with the lifting and lowering of the float, so that the opening and closing gate can be reliably opened and closed according to the amount of water in the water channel with a simple structure. be able to.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing an embodiment of a weir device according to the present invention, showing a state where an opening / closing gate is opened.

FIG. 2 is a partially cutaway perspective view showing an embodiment of the weir device according to the present invention, showing a state in which an open / close gate is closed.

FIG. 3 is a cross-sectional view of FIG. 1 in a side view.

FIG. 4 is an explanatory diagram for explaining an operation of the present invention;
(A) shows a state where the water level of the channel is lower than the intake, and (b) shows a state where the water level of the channel is higher than the intake.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Weir device 2 Fixed weir 3 Movable weir 31 Water intake 32 Drainage 4 Weir opening and closing mechanism 41 Reservoir chamber 41a Retaining wall 42 Float 43 Connecting means 44 Support post 45 Swing rod 45a Support shaft 45a Support shaft 46a Upstream rope 46b Downstream side Rope 5 Opening / closing gate 51 Gate body 51a Sealing material 52 Rotating shaft 53 Gate arm 54 Connecting arm W1 Water channel W2 Water outlet channel W3 Revetment wall W4 Water gate W4a Seal ridge W5 Water inlet

Continuation of front page (72) Inventor Mitsuhiro Ueda 5-3-17 Tanimachi, Chuo-ku, Osaka-shi Marushima Aqua System Co., Ltd.

Claims (3)

[Claims] 1. A weir device that changes a water channel when a water rise occurs and diverts the water to a water discharge channel, wherein at least one of a movable weir provided to be openable and closable across the water channel and an upstream water channel of the movable weir. And a fixed weir provided as an upstream end of the water discharge channel in the dike.When the water level in the water channel does not exceed the fixed weir, the movable weir is opened, and the water level in the water channel exceeds the fixed weir. A weir opening / closing mechanism for closing the movable weir when the weir is closed 2. The weir opening / closing mechanism includes a water reservoir provided on at least one side of the movable weir, a float disposed in the water reservoir, and a movable weir in accordance with the elevation of the float. A connection means for connecting the float and the movable weir to open and close is provided, and the reservoir has an upper edge facing the water channel on the upstream side of the movable wall at substantially the same level as the fixed weir. 2. The weir device according to claim 1, wherein the weir device is set at a height, and has a small hole for draining water at a bottom portion of the movable weir downstream of the movable weir. 3. The movable weir includes a rotating shaft extending in a direction transverse to the water channel, a gate arm rotatably supported around the rotating shaft, and a crossing of the water channel at a tip end side of the gate arm. The connecting means is provided with a column erected between the gate arm and the float, and provided on the top of the column, and in a direction crossing the water channel. An extending fulcrum shaft, a swinging rod rotatably supported around the fulcrum shaft, an upstream rope connecting the upstream end of the swinging rod and the float, A moment about the fulcrum axis about the fulcrum axis of the float is set to be larger than a moment about the fulcrum axis about the fulcrum axis of the gate arm. Features that The weir device according to claim 2, wherein