JPH0742136A - Automatic lifting/lowering device for weir - Google Patents

Abstract

PURPOSE:To utilize the water quantity of a river for livelihood water. CONSTITUTION:A weir 4 is provided on a river 1, a speed water head detecting tank 12a is provided on a revetment, and the river 1 and the speed water head detecting tank 12a are communicated by a pipe having an opening toward upstream. Two speed water head detecting floats 16b, 17b are floated on the speed water head detecting tank 12a, and water is introduced into the floats 16b, 17b via opening sections and flexible pipes 16g, 17g parallel with flowing water. Further, two water depth detecting floats 16c, 17c are floated, both floats are suspended on both sides of two horizontal arms connected to horizontal shafts 16a, 17a, and the switch of the lifting/lowering operation device of the weir 4 is connected to both horizontal shafts 16a, 17a. When the floats are lifted or lowered the horizontal shafts 16a, 17a are rotated to turn the switch on or off. A flood and a high tide can be automatically coped with, and the installation cost of an estuary weir is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic weir undulating device suitable for operation of a river mouth weir in a weir constructed for various water uses such as water supply, industrial water and agricultural water.

[0002]

2. Description of the Related Art Generally, when river water flows universally, it is natural to maintain rivers and to discharge water from the river mouth to the sea. When there is a risk of blocking the estuary due to sedimentation, a jetty is used to solve the problem by using a small amount of running water. In some areas, a estuary weir has been installed on this jetty to deal with seawater intrusion and floods.

In recent years, due to the tight water resources, estuary weirs that hold running water have become more important in addition to water stored in upstream dams and weirs. That is, in the estuary weir, a part of the flow rate can be used for water, and therefore the storage amount is smaller than that of the dam, and the facility cost can be reduced because it is closer to the consumption site.

[0004]

However, the operation of the estuary weir is different from the dam and weir built on the upstream side and faces the sea. Therefore, during flooding, if the weir is tilted too early and rises too late, If seawater invades into the sea, on the other hand, it will be difficult to operate because it will hinder flood communication if it is reversed.
It is necessary to consider fluctuations in water level due to low and high tides. It is also known from the Ministry of Agriculture, Forestry and Fisheries design standards for reclamation projects that the flow velocity required to prevent seawater from entering the reservoir (hereinafter referred to as the limit flow) is proportional to the square root of the water depth. However, it is difficult to measure the flow velocity, and the square root calculation mechanism is complicated.

Therefore, a means for electrically detecting the water level, the flow rate, the flow velocity, etc. and undulating the weir body by using a large computer is taken. Therefore, the estuary weir can be installed only in an area where it is used in a large-scale facility or where a large-scale one can be installed, which is an obstacle when expanding the application of the estuary weir. Moreover, even if the river weir is installed, there is a problem that management costs will increase. However, it is even more difficult to automatically operate the weir by drawing energy from the flow velocity because the energy is small.

An object of the present invention is to provide an automatic weaving device for a weir capable of dealing with seawater run-up and flood downflow with a simple structure.

[0007]

In order to achieve the above object, the present invention provides a weir capable of ups and downs across a river, and the river bank and the opening of the weir are directed upstream of the weir upstream of the weir. A velocity head detecting tank that communicates is provided, and two velocity head detecting floats are floated in the velocity head detecting tank, and water is introduced into the velocity head detecting float through an opening parallel to running water and a flexible tube. , Two water depth detection floats are floated in the speed head detection tank or a water depth detection tank in which river water is introduced through an opening parallel to running water as necessary, and two speed water head detection floats and two water depth detection floats are provided. Suspending on both sides of separate horizontal arms supported by two horizontal shafts, adjusting the speed head detection float connected to one of the horizontal shafts to the highest position and adjusting them in balance, and the rotation of the horizontal shafts is a standing drive switch. Interlock with other Of adjusting the concatenated velocity head detection float horizontal axis so as to balance with the lowest, characterized in that the actuating force of lodging operating the rotation of the horizontal axis.

Further, the position of the center of gravity of the whole of which the two floats are hooked down is appropriately set higher than the horizontal axis. In addition, the posture before starting has to be activated in the upright operating device if the upward buoyancy acting on the speed head detecting float becomes small, so the speed head detecting float is at the highest position, and in the fall operation device. As the upward buoyancy acting on the velocity head detecting float increases, it operates, so the velocity head detecting float should be at the lowest position.

[0009]

Since the opening of the velocity head detecting tank is directed upstream, its water level is equal to the height of the power line, and it is well known as the principle of the Pitot tube that it is higher than the river level by the velocity head. On the other hand, the water level in the velocity head detection float is
Its opening is parallel to the water flow, so it is almost equal to a river. Therefore, buoyancy proportional to the velocity head acts on the velocity head detection float.

The water depth to be detected by the water depth detection float should be the water depth at the weir position for the original purpose of preventing the intrusion of seawater. Originally, the height should be the same as the riverbed at the weir position, but instead of increasing the height, the same result can be obtained even if the velocity head detecting float is made heavier due to the decrease in buoyancy. Therefore, it can be considered that buoyancy proportional to the water depth acts on the water depth detection float.

As described above, since the buoyancy proportional to the velocity head and the buoyancy proportional to the water depth are antagonized to start, the velocity head at the time of starting is, of course, proportional to the water depth at that time. . Since the velocity head is proportional to the square of the flow velocity, the above action is consistent with the theoretical formula that the flow velocity should be proportional to the square root of the water depth. Further, after the start, the center of gravity is lowered along with the rotation of the entire apparatus, energy is generated, and the rotation is completed at once, which is suitable for starting the prime mover and opening the exhaust valve.

[0012]

Embodiments of the present invention will be described below with reference to the accompanying drawings. As shown in FIGS. 1 and 2, jetties 3 are provided on both sides of the estuary where the river 1 leads to the sea 2, and weirs 4 are provided using the jetties 3. In addition, a spillway 5 branched from just upstream of the weir 4 passes through the gate 6 to the sea 2
It leads to.

The weir 4 stands by inflowing air or water,
It uses a bag-like weir that discharges this and falls down,
The medium is selected exclusively from a civil engineering point of view, and the effect of the present invention is the same in both cases.
Here, the description will be limited to the case of air. The inflow of air into the weir 4 is performed through an air supply pipe 9 by a blower 8 driven by a prime mover 7, and exhaust is performed by opening an exhaust valve 10 attached to an exhaust pipe 9a branched from the air supply pipe 9.

The gate 6 connects the float and the door body and is opened and closed by raising and lowering the float, and operates unmanned and unpowered so that the upstream water level becomes almost constant (Japanese Patent Application No. 63-326).
668). In addition, if there is a risk of backflow due to high tide, it will be fully closed regardless of the upstream water level.

A static water tank 12 for drawing in the running water of the river 1 is provided upstream of the revetment 11 that branches off the spillway 5.
The still water tank 12 is divided into upstream and downstream sides by a partition plate 13, the downstream side is a velocity head detecting tank 12a, and the downstream side is communicated with the river 1 through a water conduit 14 that opens toward the upstream, and the upstream side is a water depth detecting tank 12b. The water is communicated with the river 1 through a water inlet 15 that is open parallel to the water flow. Further, the opening of the water conduit 14 is located sufficiently upstream of the spillway 5 so that the average velocity head of the river 1 can be detected without being affected by the flow of the spillway 5 as much as possible. is doing. The automatic undulating device for the weir 4 according to the present invention comprises this static water tank 12, a predetermined float arranged in the static water tank 12, and a device for raising and lowering the weir 4. If the water depth is large and the running water head can be ignored, the velocity head detection tank
12a One may be substituted.

By the way, when raising the weir 4, the weir 4 is operated before the seawater enters the river. The limit flow velocity Vc immediately before the seawater enters the river is represented by the formula (1) (see the formula described in the Ministry of Agriculture, Forestry and Fisheries, Design Improvement Reclamation for Structural Improvement Products). Vc = ([(ρ ₂ −ρ ₁ ) / ρ ₂ ] · g · H) ^1/2 (1) where Vc: Limit flow velocity of river to prevent seawater from entering the river m / sec H: Depth of water on the weir m ρ ₁ : Density of river water 1 t / m ² ρ ₂ : Density of sea water 1.03 t / m ² g: Acceleration of the earth's gravity 9.8 m / sec / sec

If the formula (1) is squared, divided by 2 g and corrected to the velocity head, hv: Velocity head m That is, in the present invention, the values of the left side and the right side of the equation (2) are detected using the float, and the prime mover 7 is started when the weir 4 should be raised.

As shown in FIG. 1, an erecting operation device 16 for erecting the weir 4 and a fall operation device 17 are installed side by side above the still water tank 12, and the erecting operation device 16 operates a switch for starting the prime mover 7. On the horizontal shaft 16a, which is rotatably supported along the partition plate 13 above the still water tank 12, the speed head detecting float floated in the speed head detecting tank 12a and the water depth detecting tank 12b.
A horizontal arm 16d that hangs 16b and a water depth detection float 16c at both ends is fixed, and the switch is linked to the horizontal shaft 16a.

As shown in FIG. 3, a velocity head detecting float
16b and the water depth detection float 16c are attached to the horizontal arm 16d,
Suspended via pins 16e and 16f respectively.
Further, the inside of the velocity head detecting float 16b communicates with the inside of the water depth detecting tank 12b through a flexible tube 16g. Further, a correction float 16h having a volume equal to the product of the height difference of the riverbed of the weir 4 and the area of the water depth detection float 16c is fixed to the lower end of the water depth detection float 16c. The rotation of the horizontal shaft 16a is transmitted to the switch via a connecting device 18 described later.

Further, the horizontal arm 16d is a float for detecting water depth.
The vertical arm 16i is fixed to the horizontal shaft 16a so that it is vertical when it is tilted to the maximum on the 16c side (hereinafter referred to as the set state), and the eccentric force weight 16j is adjustably attached to the horizontal arm 16i. A fine adjustment weight 16k is mounted on the arm 16d so that the position can be freely adjusted.
In addition, a stopper 16l is provided at a position diagonally lower left of the horizontal shaft 16a to regulate the maximum tilt angle of the horizontal arm 16d,
In this embodiment, both left and right are set to 60 °.

Next, the details of the standing operation device 16 will be described. The pin 16e, the horizontal axis 16a and the pin 16f form a straight line, and the space between them and the cross-sectional areas of the velocity head detecting float 16b and the water depth detecting float 16c satisfy the following formula (3) as a mechanical condition during operation. Must. γ ₁ : Distance from horizontal axis 16a to pin 16e (arm length) m γ ₂ : 〃 Pin 16f 〃 (〃) m A ₁ : Cross-sectional area of velocity head detection float 16b m ² A ₂ : Disconnection of depth detection float 16c Area m ²

Equation (2) is a hydraulic condition, but (3)
Substituting equation (2) into the equation and rearranging it is as follows. The cross-sectional area and arm length of the water depth detection float 16c are made sufficiently large so that the frictional resistance of the upright manipulator 16 can be ignored, and then the velocity head detection float 16 is calculated by the equation (4).
The cross-sectional area of b and the arm length are determined.

Further, the wall thickness of the velocity head detecting float 16b is made as thin as possible in order to eliminate the influence of the water level, and the weight of the water depth detecting float 16c is equal to the eccentric force weight 16.
It is designed so that j is almost in balance with the velocity head detecting float 16b in a state where it is not affected by buoyancy, and finally the position of the fine adjustment weight 16k is adjusted to include the cam 19j of the prime mover stopping device 19 described later. The whole is balanced.

Further, the weight and height of the eccentric force weight 16j are appropriately increased so that the resistance of the starting switch can be removed and the rotation can be surely continued after the idle rotation of 30 °.

Next, the structure of the prime mover stopping device 19 will be described with reference to FIGS. 4 and 6. The tip of the ventilation pipe 19a branched from the air supply pipe 9 is opened in the lower part of the vertical atmospheric pressure detection cylinder 19b, and the atmospheric pressure detection piston 19c is loosely fitted therein, and the upper and lower ends of the bellows 19d are at the upper ends of both. A stopper 19f having both ends fixed to the atmospheric pressure detection cylinder 19b penetrates through a vertically long detent vertical groove 19e formed in the atmospheric pressure detection piston 19c.

Further, a rod 19g is vertically fixed to the upper end of the atmospheric pressure detecting piston 19c, and the vicinity of the upper end is slidably fitted in a bearing 19h. Below that, a pair of operating pins 19i are provided in the front-rear direction in FIG. A cam 19j, which protrudes and is fixed to the horizontal shaft 16a of the upright operating device 16 and has a bifurcated involute curved surface, projects above the rod 19g.

As for the area and weight of the atmospheric pressure detecting piston 19c, the bellows 19d is used, so that the target area is the upper end. Further, since the standing operation device 16 operates and the time for inflowing air is relatively short, and the water decrease after the flood is gradual, it is considered that the flow rate does not change.

Further, when the standing operation device 16 is returned to the set state and the prime mover 7 is stopped, the vertical arm 16i has the largest resistance when it is horizontal. In that state, it is necessary to consider that the exposed portion of the depth detection float 16c in the air is large because the horizontal arm 16d is tilted in the opposite direction by 30 °. Therefore, the balance formula when the prime mover 7 is stopped is The following expression (5) is obtained. {Γ ₃ · W ₃ −A ₂ · γ ₂ ² (sin 60 ° ＋ sin 30 °) × cos 30 °} / γ ₄ + W ₄ = P · A ₄ (5) γ ₃ : Center of eccentric force weight 16j Between the horizontal axis 16a and the horizontal axis 16a m W ₃ : Weight of the eccentric force weight 16j t γ ₄ : Distance between the horizontal axis 16a and the rod 19g m W ₄ : Weight of the atmospheric pressure detection piston 19c t A ₄ : Upper end of 〃 19c Area m ² P: Design pressure

Next, the problem of automatically replenishing the air when the air leaks will be described. Replenishment of air is required when the sea level is high and the river level is low. Therefore, it is safe to assume that there is no flow velocity in the river, and the water depth is shallow, but if the water depth is Ho, the upright operation device 16 is in the set state, and the velocity head detection float.
There is almost no buoyancy acting on 16b, and the unbalanced force acting on the upright manipulating device 16 is only the buoyancy acting on the water depth detection float 16c, so the following equation (6) is obtained. A ₂ · Ho · γ ₂ cos 60 ° / γ ₄ + W ₄ = (ρ−Δρ) A ₄ (6) Ho: Water depth Δρ: Allowable atmospheric pressure decrease t / m ²

Equation (7) is obtained by subtracting Equation (6) from Equation (5) and arranging it. A ₄ = {γ ₃ · W ₃ −A ₂ · γ ₂ ² (sin 60 ° + sin 30 °) cos 30 ° −A ₂ · Ho · γ ₂ cos 60 °} / γ ₄ / ΔP …… (7) ( 7) determine the a ₄ in formula, W ₄ is made calculated from equation (5) or (6). Moreover, as judged from the equation (7),
Although Ho is included in the equation (7), the fluctuation value of the third term in {} due to the fluctuation of Ho is extremely smaller than that of the first term, and ΔP itself does not need to be accurate. There is no problem in practical use.

Next, the structure of the fall operation device 17 will be described. Since it is not preferable to stand up again immediately after the fall and repeat the ups and downs, the flow rate during the fall is set sufficiently higher than that during the rise.

As shown in FIG. 1, a laying operation device 17 for laying down the weir 4 is for opening the exhaust valve 10 provided in the exhaust pipe 9a, and is rotated along the partition plate 13 above the still water tank 12. A horizontal arm 17d that hangs the speed head detection tank 12a and the speed head float 17b and the water depth detection float 17c floated in the water depth detection tank 12b at both ends is fixed to a freely supported horizontal shaft 17a. The valve 10 is linked to the horizontal shaft 17a via a coupling device 20 described later.

As shown in FIG. 7, a velocity head detecting float
17b and depth detection float 17c are attached to the horizontal arm 17d,
Suspended via pins 17e and 17f respectively.
Further, the velocity head detecting float 17b communicates with the water depth detecting tank 12b through a flexible tube 17g. Further, a correction float 17h having a volume equal to the product of the height difference of the river bed of the weir 4 and the area of the water depth detection float 17c is fixed to the lower end of the water depth detection float 17c. Further, the stopper 17l is provided diagonally below and to the left of the horizontal shaft 17a, as in the standing operation device 16. The coupling device 20 directly connected to the exhaust valve 10 will be described later.

By the way, the upright operating device 16 needs to operate if the flow velocity is low, whereas the fallen operating device 17 has to operate when the flow velocity increases, so the set state The opposite, horizontal arm 17
The state in which d is inclined toward the velocity head detection float 17b is the set state, and in this state, the vertical arm 17i is set to the vertical state, and the eccentric force weight 17j
Is installed so that it can be adjusted. Also, fine adjustment weight 17
k is a reset device that returns the fallen operation device 17 to the set state
It has been adjusted to include the 21 movable parts so that it is balanced.

Next, the configuration of the reset device 21 is shown in FIG.
And it demonstrates with reference to FIG. The upstream air blower pipe 9 opens near the lower end of the air blow sensing cylinder 21a placed vertically in the middle of the air blower pipe 9, and a slit 21b is cut around the upper end slightly downward, and the upper and lower and left and right sides of the ring 21c. The air supply pipe 9 on the downstream side is opened in the ring 21c.

A blower detecting piston 21d is inserted into the blower detecting cylinder 21a with an appropriate gap, and a rod 21e is fixedly attached to the upper surface thereof. The rod 21e is slidably and loosely fitted to the top plate of the blower detection cylinder 21a and the bearing 21f above it, and is a rod on the upper surface of the blower detection piston 21d.
An O-ring 21g is attached around 21e. Also,
Size and weight of rod 21e and air flow sensing piston 21d
The thickness and weight of the are as small as possible.

Further, the rotation preventing pin fixed to the bearing 21f
21h is loosely fitted in the anti-rotation groove 21i dug in the rod 21e, and two pairs of operation pins in the front-rear direction in FIG.
21j protrudes, and the upper side and the lower side are sandwiched by a pair of cams 21k. The pair of cams 21k are fixed to the horizontal shaft 17a of the fall operation device 17 with a phase difference of 120 °, and the tips of the cams 21k are bifurcated to sandwich the rod 21e and are also involute surfaces.

Next, the connecting device 18 will be described with reference to FIGS. An arm 18a is fixed to the end of the horizontal shaft 16a of the upright operation device 16 so as to be vertical in the set state, and the twin claw 18 is fixed to the claw shaft 18b fixed near the upper end of the arm 18a.
c is mounted so as to be appropriately rigid and rotatable, and the twin claw 18c is symmetrical with the arm protruding on the axis of symmetry, and the weight 18d
Is adjustable so that the position of the center of gravity of the
Adjusted to match the center of 18b.

An intermediate shaft 18e is rotatably supported on the extension of the horizontal shaft 16a, and a disk-shaped cam shaft 18f is fixed to the end of the intermediate shaft 18e just below the twin claw 18c. The cam groove 18g is cut in 18f, but inside it, neither the horizontal shaft 16a nor the intermediate shaft 18e rotates, and the twin claw 18c can be rotated to accommodate either the left or right toe. The width at the right end is 30 ° to the right of the right toe in the set state.

Also, a pair of round bar trip pins 18h are fixed near the left and right toes of the twin claw 18c, and
On the inside of the right trip pin 18h when rotated by 120 ° and on the inside of the left trip pin 18h when it is returned 90 ° from that state, a pair of trippers 18i has an appropriate inclination with respect to the trajectory of the trip pin 18h. It is provided with.

The switch of the prime mover 7 and the standing operation device
In the case of the connecting device 18 interposed between the sixteen, the intermediate shaft 18e and the switch are indirectly connected via a link or other appropriate mechanism because of the arrangement of the entire device, and the intermediate device 18e and the switch 30
Both sides have play within the range of °.

Next, the coupling device 20 will be described. The rotation direction is opposite to that of the coupling device 18, but the other structure is exactly the same as that of the coupling device 18, the coupling device 20 and the exhaust valve 10 are directly coupled, and the horizontal shaft 17a is connected via the coupling device 20. 30 °
Have a play with.

Next, the operation of the automatic undulating device will be described. First, the explanation will be given from the effect of standing up. With the above configuration, the speed head detection float 16b of the upright operation device 16
Has a buoyancy force proportional to the velocity head, while
The water depth detection float 16c has a buoyancy force proportional to the water depth at the weir 4. The ratio of the value obtained by multiplying the arm length of both floats and the float area is correctly determined by the equation (4). When the flow velocity of the river 1 becomes slightly smaller than the limit flow velocity Vc shown in the equation (1), the balance of buoyancy acting on both floats is lost, the velocity head detecting float 16b descends, and the horizontal axis 16a moves to the right. Start turning toward.

The resistance at the start of rotation is only the resistance of the upright manipulating device 16 itself, and since it is sufficient to rotate the switch 30 ° before moving the switch, the weight of the eccentric force weight 16j can be small, and therefore the upright manipulating device 16 can be used. Since the frictional resistance of itself is extremely small and the balance is accurately adjusted by the fine adjustment weight 16k, the error of the flow velocity of the river 1 at the time of starting can be small.

Also, when it was reset last time, the connecting device
Since the trip pin 18h at the left tip of the 18 twin claws 18c is pushed up by the tripper 18i, the right tip is in contact with the bottom of the cam groove 18g cut in the intermediate shaft 18e in the set state. Therefore, the toe on the right side rubs against the bottom of the groove 18g to rotate. In addition, twin claws
The weight 18d is attached to 18c so that the position of the center of gravity where both are combined is in the center of the pawl shaft 18b, and because it is attached to a proper degree, the right toe of the twin pawl 18c is It does not leave the bottom of the groove 18g of the shaft 18e.

Therefore, after 30 ° idling, the right toe is in the groove
The intermediate shaft 18e starts to rotate in contact with the right end wall of 18g, and the switch of the prime mover 7 connected thereto starts to rotate. Middle axis
As the rotation of 18e progresses, the action of the eccentric force weight 16j increases, and since the flexible tube 16g of the upright operating device 16 is made sufficiently large, the switch of the prime mover 7 is turned at a stroke and the prime mover 7 is turned on. It is started, the blower 8 is driven, air supply is started, and air flows into the weir 4.

When the switch is turned by approximately 90 ° and the start of the prime mover is finished, the trip pin 18h on the right side toe is pushed by the trip piece to remove the right side toe and the left side toe to the left of the groove 18g. Is dropped near the wall.

Next, the operation of automatically closing the exhaust valve 10 that was opened during the fall is described. In the laid-down state, the horizontal shaft 17a of the laid-down operation device 17 tilts to the left, the lower left part of the horizontal arm 17d is supported by the stopper 17l, and the operation pin 21j below the reset device 21 is supported by the lower cam 21k. Then, the air blowing detection piston 21d is suspended.

When the air blowing is started, the air blowing sensing piston 21
Atmospheric pressure acts on the lower surface of d and pushes it up, and the upper operation pin 21j pushes up the upper cam 21k,
The horizontal shaft 17a of the fall operation device 17 starts to rotate to the right. At the end of the fall operation, the switching of the toes of the twin claw 18c has been completed, so the exhaust valve 10 starts to close at the same time as the start of the reset operation, and the exhaust valve 10 is in the fully closed state at the point when it returns by approximately 90 °. On the other hand, the trip pin 18h is pushed up by the tripper 18i to remove the tip of the one used for closing movement of the twin claw 18c, the pawl for opening movement is set, and the blower detection piston 21d is still pushed up. The horizontal shaft 17a of the fall operation device 17 continues to rotate.

Further, the air blow detecting piston 21d is provided with the slit 21.
When it reaches the height of b, the operating force becomes weaker because the gap around the blower detection piston 21d becomes larger, but the speed head detection float 17b is higher when standing up than when falling down.
Since the buoyancy acting on the water depth detection float 17c is reduced by the buoyancy acting on the horizontal axis of the fall operation device 17,
17a continues to rotate voluntarily, the lower operation pin 21j is pushed up by the lower cam 21k, and the blower detection piston
The upper surface of 21d and the O-ring 21g attached to the upper surface of 21d are crimped to the top plate of the air sensing cylinder 21a to maintain the set posture and airtightness.

Further, in this state, the air flow sensing piston
The height of the lower end of 21d is, of course, higher than the upper end of the slit 21b, so that the air blow sensing piston 21d does not interfere with the air blow and the air is continuously injected into the weir 4.

Next, the operation of the prime mover stopping device 19 for stopping the prime mover 7 after the injection of air is completed will be described. Weir 4
When enough air is injected into the inside, the air pressure inside the air pressure detection cylinder 19b communicating with it rises to a predetermined value, so the air pressure detection piston 19c and rod 19g are pushed up, and the cam is operated by the operation pin 19i. 19j is pushed, and the horizontal shaft 16a of the standing operation device 16 starts to rotate. When the prime mover 7 is started, the twin claws 18c of the coupling device 18 are
Has the reset side claw set, so the prime mover 7
The switch is gradually turned simultaneously with the start of the rotation of the horizontal shaft 16a, and when the vertical arm 16i becomes horizontal, it is turned at once and the prime mover 7 is automatically stopped.

Next, the operation of automatically operating the prime mover 7 and replenishing the air when the air in the weir 4 leaks out and the atmospheric pressure drops will be described. As described above, when the prime mover 7 is stopped, the load of the eccentric force weight 16j is applied to the atmospheric pressure detection piston 19c.
The eccentricity weight 16j has no effect in the set state of.

Therefore, if the weir 4 is normal, replenishment of air will not be repeated frequently, but if the atmospheric pressure falls to some extent, the atmospheric pressure detection piston 19c will descend,
On the other hand, during non-flood, the velocity head detection float 16b
Since the buoyant force acting on is small, the horizontal shaft 16a of the upright operating device 16 rotates to the right and the prime mover 7 is automatically replenished, and the prime mover 7 is stopped by the same action as in the case of the above upright.

Next, the function of causing the weir 4 to collapse when it becomes a flood will be described. Overturning operation device during non-flood
Since the buoyancy acting on the speed head 17 of the velocity head 17 is small, the horizontal shaft 17a of the fall operation device 17 tries to rotate to the right, and the blower detection piston 21d is pulled upward via the lower cam 21k of the reset device 21. O-ring 21g on top
However, it is pressure-bonded to the top plate of the blower detection cylinder 21a, and the exhaust valve 10 is fully closed to maintain airtightness.

When a flood occurs and the velocity of the river 1 reaches a predetermined value, the moment of buoyancy acting on the velocity head detecting float 17b exceeds that of the water depth detecting float 17c.
The horizontal axis 17a of the fall operation device 17 starts to rotate to the left, and
° Spinning idle, the toes of the twin claw 20c hit the wall of the groove 20g, the exhaust valve 10 is opened, the air in the weir 4 is released, and the fall begins. At that time, it is necessary to lower the air flow detection piston 21d, but since it is provided with an appropriate gap between this and the air flow detection cylinder 21a, the air flow detection piston 21d can be easily moved down. Also,
At the final stage of operation, the trip pin 20h is pushed by the trip piece 20i, the claw on the operating side is removed, and the claw on the reset side is set.

[0057]

Since the present invention is configured as described above, the horizontal shafts rotate due to the balance between the velocity head detecting float and the water depth detecting float, and the respective two horizontal shafts act to raise the weir. It is designed to be in a state of probation and can automatically prevent floods and intrusion of seawater. This greatly reduces administration costs and therefore
We believe that it can contribute to the spread of river mouth weirs and the securing of water resources.

[Brief description of drawings]

FIG. 1 is a plan view showing an automatic weaving device for a weir according to an embodiment of the present invention.

FIG. 2 is a plan view showing an arrangement of the entire estuary weir operated by the automatic undulating device shown in FIG.

FIG. 3 is a side view showing a standing operation device of the automatic undulating device shown in FIG.

FIG. 4 is a side view showing a prime mover stopping device of the automatic hoisting device shown in FIG. 1.

5 is a side view of members used in the coupling device and the coupling device of the automatic undulating device shown in FIG. 1. FIG.

6 is a top view of a cylinder portion of the prime mover stopping device shown in FIG. 4. FIG.

7 is a side view showing a fall operation device of the automatic undulating device shown in FIG. 1. FIG.

8 is a side view showing a reset device of the automatic undulating device shown in FIG. 1. FIG.

9 is a plan view of the upper portion of the reset device shown in FIG.

10 is a front view of members used in the coupling device and the coupling device shown in FIG. 5. FIG.

[Explanation of symbols]

 1 river 4 weir 12a Velocity head detection tank 12b Water depth detection tank 16a Horizontal axis 16b Velocity head detection float 16c Water depth detection float 16d Horizontal arm 16g Flexible tube 17a Horizontal axis 17b Velocity head detection float 17c Water depth detection float 17d Horizontal arm 17g Flexible tube

Claims (1)

[Claims] 1. A weir capable of undulating across a river is provided, and a velocity head detecting tank communicating with the inside of the river toward the upstream is provided on the upstream bank of the weir, and inside the velocity head detecting tank. Two velocity head detecting floats are floated on the water, and water is introduced into the velocity head detecting float through an opening parallel to the flowing water and a flexible pipe, and the velocity head detecting tank or river water is flowed as necessary. Two depth detection floats are floated in the depth detection tank introduced through the opening parallel to the above, and each velocity head detection float and depth detection float are suspended on both sides of separate horizontal arms supported by two horizontal axes. The speed head connected to one of the horizontal shafts is adjusted so that it is balanced at the highest position, the rotation of the horizontal shaft is linked with the switch for standing drive, and the speed head connected to the other horizontal shaft is detected. Float lowest The automatic weaving device for a weir, wherein the rotation of the horizontal shaft is used as the actuation force for the fall operation.