JPH09221736A - Flap gate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gate which eliminates the need for a high rigid door resisting against the strength of a water current and a water pressure and which is economic and advantageous due to low manufacturing cost and practically free of engagement with a foreign matter and troubleshoots the solution of maintenance hazards demanded by prior art technology although it is based on a principle which houses the door on the bottom of a tailrace. SOLUTION: As a basic structure, a door 2 whose cross section is practically fan- shaped, is turned, centering a fulcrum 24 provided near the bottom of a downstream side water current 12, thereby opening and closing a tailrace. A housing chamber 4, which houses the door 2 when it is turned over and a hydraulic cylinder 3, is recessively provided below the bottom 13 of the tailrace 1. There are provided a water conveyance pipeline which maintains the water tightness of the housing chamber 4 and communicates the housing chamber 4 with an upstream side water current 11 openably and a drain device 6 of filled water. When the housing chamber 4 is filled with water, the water pressure in the tailrace 1 is balanced separated from the door 2. If an external force is reduced to a considerable extent, earth and sand or the like are pushed with the water pressure so that engagement force may be lost, thereby troubleshooting the hazards. Only in the case of inspection or repair, filled water is drained from the housing chamber 4, thereby forming a hollow chamber.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spillway, for example, an undulating gate for adjusting the water level in a normal river or a sector gate provided at a constant water level of a flood adjusting dam.

[0002]

2. Description of the Related Art Generally, in rivers flowing down plains, urban areas, etc., an undulating gate is provided across a river width of 100 m, and the water of the river flowing down by standing the door body of the undulating gate at a desired angle. In many cases, a method of adjusting the water level by blocking the river or overflowing from the tip is used, but in this case, the total river width of 100 m is divided into, for example, 5 and there are 5 rugged gates with a width of 20 m per gate. The water level of the river is adjusted over the entire width, and it is installed in many places to ensure a safe civic life as a irrigation facility to prepare for floods when the water level increases during the rainy season.

On the other hand, as a water level adjusting function of a flood adjusting dam or the like, opening / closing of a spillway gate provided at the top of the dam body is used. It is considered rational to maintain a system to maintain the water level and to prepare for the approaching flooding period, and the water is discharged from the water discharge pipe provided at the bottom of the dam body to maintain the full water level at all times.

In the case of the flood control dam, since water is discharged so that the water level is always kept at a full level, it is unavoidable that the influx from the upstream side accumulates on the water surface at this water level. Since there is a strong demand for surface water to flow down on the downstream side, a model has been proposed in which a spillway for spillway is always provided near the full water level, and a sector gate for opening and closing the spillway is provided. Connected to.

As an undulating gate for the spillway for spillage, like the other undulating gates that have been commonly used at the beginning, the end of the door body is centered in the storage room recessed toward the ceiling side of the spillway. Although the door was housed by rotating it, when discharging the gate with the gate slightly opened in the discharge channel, the problem was that dust floating on the bottom of the skin plate on the front of the door could be caught and could not flow down. There was a long-awaited operation gate.

The prior art disclosed in Japanese Utility Model Publication No. 58-53311 proposes an undulating gate as shown in FIG. 5 for the purpose of improving this problem. In the figure, a door body 2 of an undulating gate interposed in the middle of a spillway 1a for spillway
a is a width substantially equal to the lateral width of the discharge channel, and includes a skin plate 21a having an arc-shaped cross section, side rectifying plates 22a extending rearward from both sides thereof, and an upper edge surface of the skin plate and the side rectifying plate. A cross section is formed into a fan shape with the upper straightening vane 23a to be connected,
The water discharge channel 1a is opened and closed by rotating around a fulcrum 24a provided near the bottom surface of the downstream water channel. The feature is that a lower gate chamber (storage room) 4a for accommodating the door when it falls to open the discharge channel is recessed below the bottom surface of the discharge channel, and a gate is inserted into this lower gate chamber 4a. A hydraulic cylinder 3a for ups and downs is installed, and a boundary surface between the outer periphery of the door body and the water discharge passage and a rotating fulcrum 24 so as to prevent water leakage from the water discharge passage.
This is because a watertight packing was attached to the periphery of a to completely prevent the inflow of running water. As a result of this configuration, the running water overflows by pulling down the door a little, and the floating dust can be smoothly discharged. Also, it is said that the spillway for spillway was completely closed by completely pulling up the door body, while the spillway could be performed by completely housing the door body in the lower gate chamber 4a. There is.

[0007]

However, even if this improved undulating gate is applied to the above-mentioned river gate or spillway gate, another serious problem is recognized. That is, in this type, when the gate is open, the water force of the discharge channel, the water pressure presses the front skin plate, and even when the gate is closed, the total weight of the running water flowing down the upper surface of the skin plate is loaded, A highly rigid door structure that can withstand the external force is an essential condition. Further, since the hydraulic pressure of running water and the total weight of the gate are constantly added to the hydraulic cylinder 3a that supports the door in the lower gate chamber 4a, the capacity is insufficient and a sufficient function can be maintained unless a large driving force is applied. There is a fear that it will not. Also, since the water pressure and its own weight are large, it is easy to cause oil leaks in the hydraulic cylinder seals, hydraulic pipes, hydraulic devices, etc. Once the oil leak begins, the gate may drop by its own weight and the flow rate may fluctuate unstablely. There is also a possibility that the reliability of the function of the gate is lowered.

In order to prevent water from entering the lower gate chamber from the water discharge channel, a portion in contact with a boundary surface between the door body and the water discharge channel, for example, a skin plate 21a on the front surface of the door body and an upstream water channel,
Water-stop rubbers 101 and 102 are provided at the contact points between the upper straightening vane 23a and the downstream water passage, respectively, and the water-stopping rubber is provided on the contact surface between the side straightening vanes 22a on both sides of the skin plate and the inner wall surface of the discharge passage. Although 103 are attached respectively, strong water pressure also acts on the mounting surface of this waterproof rubber, so if it is an undulating gate for rivers, the earth and sand accumulated on the bottom of the discharge channel, or if it is a sector gate of a dam. Dust particles floating in the water are likely to be caught, and if caught, the sealing function will decrease and water leakage will start in the lower gate room, or if sliding while caught, the waterproof rubber will be damaged and further water leakage will occur. There is a high risk of adversely affecting the gate opening / closing function, such as spurring on the road and creating a vicious circle, and it is inevitable that a heavy burden will be imposed on the maintenance management of the discharge channel.

In order to solve the above problems, the present invention provides
It is economically advantageous because the manufacturing cost is low because there is no need to use a highly rigid door body to counter water pressure and water pressure, even though it is based on the principle that the door body is housed on the bottom of the discharge channel. (EN) An undulating gate that solves the problems of the prior art such as daily maintenance because it is less likely to be complicated.

[0010]

In the undulating gate according to the present invention, a door body 2 having a substantially fan-shaped cross section which is interposed in a discharge channel 1 is centered around a fulcrum 24 provided near a bottom surface of a downstream channel 12. Swing to open and close the water discharge channel 1 and the door body 2 at the time of fall
And a storage chamber 4 for accommodating the hydraulic cylinder 3 for ups and downs of the door body is assumed to be recessed below the bottom surface 13 of the water discharge passage 1, and further, a boundary surface portion between the door body 2 and the water discharge passage 1 Sliding freely to maintain the watertightness of the storage chamber 4
A water conduit 5 that opens and closes the storage chamber 4 and the upstream water passage 11 and a drainage device 6 that discharges the filled water in the storage chamber 4.
It is characterized by the fact that it is equipped so that it can be operated.

With this structure, whether the door is standing upright to close the water discharge passage or it is inverted and opened, the upstream water passage and the water conduit are opened and communicated with the storage chamber containing the door. If the water is replenished with water, the containment chamber will be in a state of being balanced with the water pressure of the discharge channel by separating the door body, and the external force applied to the door body will be much reduced compared to the conventional case. Also, if there is a strong water pressure, it may cause dirt and dust to be caught in the sealing surface, and there was a strong risk of water leakage into the storage room.However, if the storage room and the external drainage channel are pressure balanced, the contact surface , Because the force pushing into the boundary part such as the connecting line disappears, even if, for example, the earth and sand are accumulated on the bottom surface of the upstream water channel, the force pushed by the water pressure loses the biting force, thereby solving the above problem .

When it is necessary to inspect or repair the hydraulic cylinders in the storage room, the water pipe is closed and the water filling up the storage room is discharged by the drainage device regardless of whether the door is standing or falling. For example, at the interface between the discharge channel and the door body, the packing (sealing rubber) prevents water from entering the room and the drainage progresses to a hollow state. Various indoor work becomes possible.

[0013]

DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side sectional view of the undulating gate, showing a state in which a door stands upright in the discharge channel to adjust the design flood (water level Z), and FIG. 2 shows a NN cross section of FIG. ing. Further, FIG. 3 shows a state in which the door body is overturned to open the discharge channel in the same embodiment, and the total amount of water is discharged to the downstream side channel. The door body 2 has a width substantially equal to the lateral width of the discharge channel, and a skin plate 21 having an arc-shaped cross section facing the upstream side channel.
And a side rectifying plate 22 extending rearward from both sides of the skin plate so as to be substantially adjacent to the water discharge channel, and an upper rectifying member in which an upper edge of the skin plate and an upper edge of the side rectifying plate are connected by welding. A cross-sectional shape is formed in a fan shape with the plate 23, and a fulcrum 24 is provided in a hinge portion 25 corresponding to the corner of the fan so that it can rotate around the fulcrum 24 on the downstream side of the storage chamber 4 of the undulating gate. Pivot. The skin plate 21 faces the upstream side water channel as shown in FIG. 1, plays a role of a weir at a normal water level Y level, and when the water level rises to reach the Z level, the overflow water flows down to the downstream side water channel. For example, in the case of an undulating gate that divides a river with a total width of 100 m into 5 gates, the width of each individual undulating gate is 20 m, the total length of the side baffles reaches 7 to 10 m, and the maximum overflow height. When set to 3m from the bottom of the water, the total weight per gate will be about 160t,
In view of the usage conditions that are always immersed in running water,
It is desirable that the door body is entirely made of a welded structure made of stainless steel.

Since a hydraulic cylinder 3 is attached to the storage chamber 4 for driving the door and is used for driving the undulating gate, the hydraulic cylinder also needs a huge capacity.
As described above, two sets of hydraulic cylinders having a maximum capacity of about 150 t are provided symmetrically in the lateral direction of the door body 4. A bracket 31 fixed to the bottom of the storage chamber 4 is connected to the lower part of the hydraulic cylinder 3 by a pin 32, and an upper part is fixed to a pin 33 connected to the door body at the upper end of the hydraulic cylinder 3. The fork end 26 is rotatable with the pin 33. It goes without saying that the inner surface of the fork end, which comes into contact with the pin, is made of a member such as a non-lubricated sintered alloy bearing that fulfills a special lubricating function so that it can rotate smoothly even when immersed in water. When the hydraulic cylinder 3 is operated in the vertical direction, the door 2 swings around the fulcrum 24 to adjust the water flow. When discharging the total amount of water in the discharge channel provided in a river or dam, the hydraulic cylinder 3 is contracted to the shortest stroke and the door body 2 is completely drawn into the storage chamber 4, and as shown in FIG. The line 23 is almost at the same level as the bottom surface of the discharge channel and makes the flow channel continuous.

Since the hydraulic cylinder is submerged in the storage chamber under a constant use condition, it is made of stainless steel like the door body, and the attached fork ends and pins are also made of stainless steel, or are plated with Cr. It is desirable to form a surface with a protective film to protect the corrosion resistance.

Regardless of the posture of the door body, in a normal flow, the valve 51 of the water conduit that communicates with the storage chamber 4 is opened to draw water from the upstream water passage, and the back side of the door body and the storage chamber are located upstream. It is filled to the same level as the waterway. As a result, the water pressure of the upstream water channel and the water filling of the containment chamber are balanced, and the load due to the water pressure applied to the door body is greatly reduced, so there is no need to design the rigidity of the door body too much, and it is bold and lightweight. Will be realized and the production cost will be significantly reduced. As mentioned above, when targeting large-scale rivers and dams, it is inevitable that the door body will become extremely large, so a significant weight reduction will be realized in it, so it will be a very important contribution to society. Needless to say that it leads to. on the other hand,
Since the load applied to the hydraulic cylinder 3 that supports the door body is much lower than that of the conventional one, it brings about a great advantage that a small hydraulic cylinder can hold a fixed position, and at the same time, the seal portion of the hydraulic cylinder, the hydraulic pipe, and the hydraulic device. In each case, since the load is small, the possibility of oil leakage is reduced, and the conventional fear of weight drop is eliminated.

Further, in a steady use state, the water in the storage chamber 4 and the water in the water channel are pressure balanced, so that the water blocking member attached between the inner surface of the water discharge channel and the outer peripheral surface of the door body. There is no risk of dirt or dust getting caught in the contact surface, the sealing action is always maintained, and the water blocking member is not damaged by being caught. For example, as shown in FIG. 1, near the bottom of the upstream water channel where the door stands up, sediment A that has flowed down from the upstream and is blocked is accumulated, but the water pressure on the inner and outer surfaces across the skin plate is almost the same. Since they are in opposition to each other, the compulsive force for press-fitting the earth and sand into the boundary surface between the watertight packing 71 and the skin plate 21 does not appear.

When it is necessary to inspect the undulating gate or repair the hydraulic cylinder, the filled water must be discharged so that the worker can enter the storage chamber 4 to perform work. I won't. In that case, the valve 51 of the water conduit that communicates with the upstream water channel is closed from the outside by remote operation (for example, operation of the electric motor), and then the drainage device is operated. In the example of FIG. 3, the drainage pump 61 is started from the outside by remote operation (operation of the electric motor), drained to the downstream water passage (not shown) through the drainage pipe 62, and all the water in the room is removed to leave a hollow state. And

A water stop portion 7 is interposed between the door body and the water discharge passage so as to prevent water from entering the hollow storage chamber 4 through the water discharge passage. Although the mode of stopping water is not particularly limited, the form of the drawing will be described as an example. 1 or 3
In the portion where the door body is in contact with the upstream water channel and the downstream water channel, the watertight packings 71 and 7 are provided over the entire lateral width of the discharge channel.
2 are installed. More specifically, as shown in FIG. 4 (A), a plurality of watertight packings 7 are provided by packing holding arms 73 provided on the upper side surface 41 of the storage chamber 4 in contact with the upstream water channel.
1 is held so as to slidably press contact with the surface of the skin plate 21 of the door body 2, and the downstream side is as shown in FIG. 4 (B).
A plurality of watertight packings 72 are provided by the packing holding arm 74 provided on the upper side surface 42 of the storage chamber 4 which is in contact with the downstream water channel.
Is held so as to be slidably pressed against the surface of the hinge portion 25 of the door body, thereby preventing water leakage to the storage chamber. It is needless to say that the replacement of water with air in the storage chamber is smoothly carried out through an appropriate air hole, though not shown.

On the other hand, as shown in FIG. 2, a watertight packing 75 is attached to the entire side surfaces of the side straightening vanes 22 constituting the both side surfaces of the door body so that watertightness is maintained between the side surfaces 14 of the discharge channel. maintain. Even when the door swings and rotates and rises and falls, it always slides and presses against it, cutting off the communication between the storage chamber and the discharge channel. Together with this, it can be made hollow.

[0021]

As described above, in the undulating gate according to the present invention, the load due to the water pressure and water pressure is much smaller than that of the prior art, so that the rigidity of the door itself is small and the weight can be sufficiently reduced. At the same time, the capacity of the hydraulic cylinder can be lowered to a low level, which leads to weight reduction and downsizing of the entire facility, which leads to a reduction in facility cost and a great economic advantage. Further, since the load of water pressure on each component of the hydraulic cylinder is reduced, there is no fear that the drive function will be adversely affected, and the reliability of the gate opening / closing function is improved. In addition, foreign matter such as dirt and dust will be drastically reduced from being caught in the boundary surface between the door and the discharge channel, which will reduce damage to the water blocking part, maintain the water blocking function for a long time, and reduce the maintenance burden. It also has the effect of making it significantly lighter.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line NN of FIG.

FIG. 3 is a side sectional view showing a state different from that of FIG. 1 of the same embodiment.

FIG. 4 is a cross-sectional side view of two main parts of the water stop part (A).
It shows with (B).

FIG. 5 is a side sectional view showing a conventional technique.

[Explanation of symbols]

 1 Drainage channel 2 Door body 3 Hydraulic cylinder 4 Storage room 5 Conduit pipe 6 Drainage device 7 Water stop part 11 Upstream channel 12 Downstream channel 13 Channel bottom 14 Channel side 21 Skin plate 22 Side baffle plate 23 Upper baffle plate 24 Support point 31 Bracket 41 Upper side surface (upstream side) 42 Upper side surface (downstream side) 51 Valve 61 Drain pump 62 Drain pipe 71 Watertight packing (upstream side) 72 Watertight packing (downstream side) 75 Watertight packing (side straightening plate)

Claims (1)

[Claims] 1. A door body 2 having a substantially fan-shaped cross section interposed in a water discharge channel 1 rotates around a fulcrum 24 near a bottom surface of a downstream water channel 12 to open and close the water discharge channel 1, and Door body 2 at the time of fall
And the storage chamber 4 accommodating the hydraulic cylinder 3 for undulating the door body 2 is slid to the boundary surface portion between the door body 2 and the water discharge passage 1 at the undulating gate recessed below the bottom surface 13 of the water discharge passage 1. Maintaining the watertightness of the storage chamber 4 by movably interposing the water blocking part 7,
A water conduit 5 that opens and closes the storage chamber 4 and the upstream water passage 11 and a drainage device 6 that discharges the filled water in the storage chamber 4.
An undulating gate characterized by being equipped with a freely operable.