JP2005023748A - Excessive response prevention device for upstream side water level control gate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an excessive response prevention device for an upstream side water level control gate capable of preventing excessive response and excessive operation of a door body due to hydraulic conditions on the upstream side, for example, swell of water surface and waves. <P>SOLUTION: This excessive response prevention device for the upstream side water level control gate 1 is provided with a flow-in control means for controlling flowing-in of water into a water pouring tank 8 in accordance with vertical movement of a float 5. The flow-in control means is constituted in such a way that the water pouring tank 8 and the float 5 are mutually connected by a connection means 31 and operation amount proportional to operation amount of vertical movement of the float 5 by corresponding to the vertical movement is transmitted to the water pouring tank 8 through the connection means 31 to elevate and lower the water pouring tank 8, thereby preventing hunting. Since water does not flow into the water pouring tank 8 simultaneously even if swell and waves occur, the door body does not respond excessively and a stable condition can be held. The door body rises and lowers at proper elevation speed by corresponding to change of water level to keep proper water level on the upstream side. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an upstream water level control gate, and more particularly to an apparatus for preventing excessive response of an upstream water level control gate that is not affected by hydraulic conditions upstream of the gate.

In general, the water channel is provided with a gate that opens and closes the water channel by automatically raising and lowering the door body according to the water level on the upstream side or the downstream side of the gate. In particular, a conventional upstream water level control gate that automatically raises and lowers the door body according to the upstream water level to open and close the water channel will be described with reference to FIG. 6 and also with reference to FIGS. 4 and 5.
As shown in FIGS. 4 to 6, the conventional upstream water level control gate 50 includes a door body 3 that can open and close the water channel 2, a rotary shaft 4 that is connected to the door body 3 and crosses the water channel 2, and buoyancy. A float 5 that rotates the rotary shaft 4 by moving up and down by moving up and down, a float chamber 7 that is located on the side of the water channel 2 and accommodates the float 5, and a float chamber 7 provided upstream of the float chamber 7. And a water injection tank 8 communicating with the float chamber 7 with the upper end set on the upstream set water level surface 20 of the still water pond 6 and the float chamber 7. And an outflow port 18a provided in the main body.

The door body 3 is disposed on the upstream side of the rotary shaft 4 that crosses the water channel 2, and is fixed to the upstream end portions of the two gate arms 9 that are fixed to the rotary shaft 4 and extend in the water channel direction. On the other hand, a counterweight 10 is fixed to the downstream end of the gate arm 9.
On the side of the water channel 2, two partition plates 15 and 16 are arranged at intervals in the direction of the water channel, and are divided into a still water basin 6, a float chamber 7, and a basin 11 from the upstream side. Further, the water channel 2 a on the upstream side of the door body 3 communicates with the still water basin 6, and the water channel 2 b on the downstream side of the door body 3 communicates with the basin 11.

In the still water pond 6, a water injection tank 8 is disposed, and the upper end 8 a that is opened is set on the upstream set water level surface 20. The water injection tank 8 is covered with a dust-proof wave-proof cylinder 8 b on the outer periphery, and a water injection pipe 17 communicating with the float chamber 7 is extended from the lower part of the water injection tank 8.
The float chamber 7 accommodates the float 5, and the float chamber 7 communicates with the basin 11 through the outlet 18 a, and the float 5 communicates with the basin 11 through the communication pipe 18. . A connecting rod 19 is extended upward on the float 5, and an upstream end portion of the float arm 21 is pivotally mounted below the connecting rod 19, and a downstream end portion of the float arm 21 is rotated. It is fixed to a rotating shaft 22 that is linked to the shaft 4 and located above the reservoir 11.
In addition, a pedestal 23 is disposed above the recreation pond 11 so as to surround the rotating shaft 22, and a protrusion 24 is disposed on the pedestal 23. A shaft portion 26 fixed to the downstream end portion of the float auxiliary arm 25 is inserted into the protrusion portion 24, and the float auxiliary arm 25 is supported by the protrusion portion 24 so as to be rotatable around the shaft portion 26. The upstream end of the float auxiliary arm 25 is pivotally attached to the upper part of a connecting rod 19 extending from the float 5.

Next, the operation of the conventional upstream water level control gate 50 will be described with reference to FIGS. 4 and 5 based on FIG.
When the water level 2a on the upstream side of the door body 3 rises and the water level of the still water pond 6 exceeds the upper end 8a (upstream set water level surface 20) of the water injection tank 8, the water passes through the water injection pipe 17 from the upper end 8a of the water injection tank 8. And flows into the float chamber 7. When the amount of inflow from the water injection pipe 17 to the float chamber 7 exceeds the amount of outflow from the outlet 18a, the water level in the float chamber 7 rises, the float 5 rises due to buoyancy, and the float arm 21 and the rotary shaft 22 Is rotated in the clockwise direction, and the door body 3 connected to the rotating shaft 4 interlocked with the rotating shaft 22 via the gate arm 9 is turned up and the water channel 2 is opened.
On the other hand, when the water level 2a on the upstream side of the water channel 2 is lowered from the upstream set water level surface 20, the water does not flow into the float chamber 7 from the upper end 8a of the water injection tank 8, and the water in the float chamber 7 flows from the outlet 18a. Since it is discharged to the water pond 11, the float 5 is lowered, and the door body 3 is also lowered in conjunction with the float 5 to close the water channel 2.

  Further, as a gate for adjusting the upstream water level, which is different from the structure described above, Patent Document 1 discloses that an inlet that flows into the float when the water level in the float chamber rises to a predetermined position is provided on the side wall of the float. In addition, an outlet is provided on the side wall of the downstream drainage basin, and a siphon pipe communicating between the float outlet and the downstream drainage tank is disposed, and the amount of water injected and drained into the float is determined by the siphon pipe. It is disclosed that the water level is controlled by an on-off valve and the water level on the upstream side of the water channel is adjusted by controlling the opening and closing of the gate as the float moves up and down.

JP 2002-242167 A

  As described above, in the conventional upstream water level control gate 50 shown in FIG. 6, the water injection tank 8 whose upper end 8 a is set to the upstream set water level surface 20 is disposed in the still water reservoir 6, and the water level of the still water reservoir 6 is When the upper end 8a of the water injection tank 8 is exceeded, water flows into the float chamber 7 from the upper end 8a of the water injection tank 8, the float 5 rises, and the rotary shafts 22 and 4 rotate to raise the door body 3. However, in this embodiment, when the water level exceeds the upstream set water level surface 20 and the door body 3 starts to rise, water is generated in the water injection tank 8 at once due to upstream hydraulic conditions such as swells and waves. In such a case, the door body 3 responds and opens too much, and it is difficult to appropriately maintain the upstream water level. Furthermore, even when the swell and flow rate are extremely small, the water level of the hydrostatic pond 6 swings up and down with the upstream set water level as a boundary, and the water flows into the water injection tank 8 with a time difference. Depending on the rate of change, the door 3 overresponds and repeatedly opens and closes the water channel 2, amplifies the swell on the upstream water surface of the door 3, and further generates harmful waves and swells on the downstream side. was there.

  Moreover, in patent document 1, the siphon pipe which connects the outflow port of a float and a downstream drainage tank is arrange | positioned, the amount of water injection / drainage into a float is controlled by the opening / closing valve of a siphon pipe, and it is accompanied by the up-and-down movement of a float The water level on the upstream side of the water channel is adjusted by controlling the opening and closing of the gate, but the operating mechanism associated with the opening and closing of the gate is complicated, so it may be difficult to adjust the upper limit water level during and after installation. There is still room for improvement.

  The present invention has been made in view of such points, and prevents hydraulic conditions on the upstream side, for example, over-response of the door body due to swell or waves on the water surface, excessive operation, and during and after installation. It is an object of the present invention to provide an over-response prevention device for an upstream water level control gate that is easy to adjust and maintain an upper limit set water level and the like.

According to the present invention, as means for solving the above-mentioned problems, the invention described in claim 1 is characterized in that the rotating shaft is connected to a door body capable of opening and closing the water channel and traverses the water channel, and the rotation is performed by vertical movement by buoyancy. A float that rotates the shaft to raise and lower the door body, a float chamber that is provided on the side of the water channel and that accommodates the float, is provided on the upstream side of the float chamber, communicates with the float chamber, and upstream of the door body In an over-response prevention device for an upstream water level control gate comprising a still water pond communicating with a water channel on the side, a water injection tank disposed in the still water pond and communicating with the float chamber, and an outlet provided in the float chamber, Inflow control means for controlling the inflow of water into the water injection tank as the float moves up and down is provided.
By configuring in this way, the water level rises and water begins to flow into the water injection tank, and at the same time, the inflow control means regulates the flow of water into the water injection tank, so swells and waves are generated at that water level. Even so, the water does not flow into the water injection tank all at once, so that the door body can be kept in a stable state without excessive response, and an appropriate water level can be maintained.
Further, when the water level on the upstream side of the door body exceeds the upper end of the water injection tank and the water level further rises, the water flows into the float chamber from the upper end of the water injection tank, and the float rises due to buoyancy. Therefore, as the water level rises, a desired amount of water flows into the water injection tank, so that the float and the door body can be gradually raised according to the change in the water level, and an appropriate water level can be maintained. . In addition, this effect produces the same effect also when a water level falls and a door body descend | falls.

The invention described in claim 2 is the invention described in claim 1, wherein the inflow control means arranges the water injection tank so as to be vertically movable, and connects the water injection tank and the float by a connection means. In accordance with the vertical movement of the float, an operation amount proportional to the operation amount is transmitted to the water injection tank through the connecting means, and the water injection tank is moved up and down to control the inflow of water into the water injection tank. It is the structure which carries out.
By configuring in this way, when the water level reaches the upper end of the water injection tank and water flows into the water injection tank, the water injection tank also rises in proportion to the amount of float rise, so swells and waves are generated at that water level. Even if it does, since water does not flow into a water injection tank at a stretch, a stable state can be maintained and an appropriate water level can be hold | maintained without an over-response of a door body.
Furthermore, when the water level of the still water pond exceeds the upper end of the water injection tank (upstream lower limit water level surface), water begins to flow into the water injection tank, the float rises and the water injection tank rises in proportion to the amount of float rise, After that, when the water level gradually rises from the upstream lower limit water level, the water injection tank gradually rises in conjunction with the float, so the amount of water flowing into the water injection tank is gradually reduced, and the door body changes in water level. When the water level reaches the upstream upper limit water surface, it is fully open.
As a result, as the water level rises from the upstream lower limit water level surface, the door body gradually rises while responding to changes in the water level, so it is possible to prevent the door body from rising excessively and maintain an appropriate water level. it can. In addition, this effect produces the same effect also when a water level falls and a door body descend | falls.

The invention described in claim 3 is the invention described in claim 2, wherein the connecting means is connected to a connecting rod extending above the float via a link member, and a fulcrum with the vertical movement of the connecting rod. An upper rotary arm that rotates around the upper rotary arm, and a lower rotary arm that is connected to the upper rotary arm via a link member, rotates about a fulcrum in proportion to the amount of rotation of the upper rotary arm, and raises and lowers the water injection tank It is characterized by providing these.
By comprising in this way, it becomes possible to raise / lower a water injection tank with the up-and-down movement of a float with a simple structure, installation becomes easy, and the maintenance after installation also becomes easy.

  The apparatus for preventing excessive response of the upstream water level control gate of the present invention includes inflow control means for controlling the inflow of water into the water injection tank as the float moves up and down, and the inflow control means includes the water injection tank and the float. Is connected with the connecting means, and in response to the vertical movement of the float, the operation amount proportional to the operation amount is transmitted to the water injection tank through the connection means, and the water injection tank is moved up and down. It is possible to move up and down at an appropriate lifting speed while responding to changes in the water level between the upstream upper limit water level surface and the upstream lower limit water level surface, and it is possible to always maintain an appropriate water level. In addition, when the water level reaches the upper end of the water injection tank and water flows into the water injection tank, the water injection tank also rises in proportion to the amount of float rise, so even if swells or waves occur at that water level, Since water does not flow at a stretch, the door body can maintain a stable state without over-response and prevent hunting. Therefore, swells and the like are not amplified on the water surface of the waterway, freeboard (the difference in height between the waterway top and the water surface) can be minimized, and civil engineering work costs can be reduced.

  Moreover, according to the over-response prevention apparatus of the upstream water level control gate of this invention, since it is comprised by simple structure, the upper end of a water injection tank is arrange | positioned according to actual conditions, such as water intake conditions and gate movement. The difference between the upstream lower limit water level and the upstream upper limit water level where the water injection tank rises and stops, that is, the fluctuation of the upstream set water level can be easily adjusted locally, and optimal water level control is possible depending on the period. , Adjustment and maintenance during and after installation become easy.

Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to FIGS. In the description of the best mode for carrying out the present invention, the same members and corresponding parts as those in the conventional example will be described using the same reference numerals.
As shown in FIGS. 1, 4, and 5, the over-response prevention device for the upstream water level control gate 1 according to the embodiment of the present invention includes a door body 3 that can open and close the water channel 2, and the door body 3. A rotary shaft 4 that is connected and traverses the water channel 2, a float 5 that rotates the rotary shaft 4 by moving up and down by buoyancy and moves the door 3 up and down, and a float chamber that is located on the side of the water channel 2 and accommodates the float 5. 7, a still water pond 6 provided upstream of the float chamber 7 and communicating with the float chamber 7 and communicating with the water channel 2a on the upstream side of the door body 3, and a float chamber disposed in the still water basin 6 so as to be vertically movable. 7, a water injection tank 8 communicating with the water injection pipe 17 a, an outlet 18 a provided in the float chamber 7, and an inflow control means for controlling the inflow of water into the water injection tank 8 as the float 5 moves up and down. It is roughly composed of
Here, the description of the same form as the conventional example is omitted here, and only the form different from the conventional example will be described below.

  The water injection tank 8 has an upper end 8 a set at the upstream lower limit water level surface 40 of the still water basin 6, and extends downward from a lower rotary arm 37 described later on the side wall of a dust-proof wave-proof cylinder 8 b covering the outer periphery. The fixing member 39 is fixed and arranged so as to be movable up and down. A water injection pipe 17a communicating with the float chamber 7 is connected to the lower part of the water injection tank 8, and a telescopic bellows hose 17b is connected to an intermediate portion of the water injection pipe 17a. Here, the height (upstream lower limit water level surface 40) of the upper end 8a of the water injection tank 8 can be adjusted to an appropriate height by manually turning a setting handle (not shown).

  The inflow control means connects the water injection tank 8 and the float 5 with the connection means 31, and transmits an operation amount proportional to the operation amount to the water injection tank 8 through the connection means 31 as the float 5 moves up and down. The water tank 8 is moved up and down to control the inflow of water into the water tank 8.

  The connecting means 31 includes a connecting rod 19 extending above the float 5, an upper rotating arm 33 connected to the connecting rod 19 via a link member 32 pivotally attached to the upper portion thereof, and the upper rotating arm 33. And a lower rotary arm 37 connected via a link member 34.

The upper rotary arm 33 is formed in a substantially oval shape, and a shaft portion 26 is fixed to the downstream end portion thereof. The shaft portion 26 is rotatably supported by the projection portion 24, and the upper rotary arm 33 is The protruding portion 24 is supported so as to be rotatable about the shaft portion 26. On the other hand, the downstream end of the link member 32 is pivotally attached to the shaft portion 38 fixed to the upstream end of the upper rotary arm 33, and the upstream end of the link member 32 is the upper part of the connecting rod 19. It is pivotally attached to. Here, the length of the link member 32 can be easily set to an appropriate length on site.
In addition, a downstream end portion of the link member 34 is pivotally attached to the shaft portion 38 fixed to the upstream end portion of the upper rotary arm 33, and the link member 34 has a rotation amount of the upper rotary arm 33. Correspondingly, it is configured to rotate at a predetermined rotation angle.

Further, the partition plate 15 that partitions the still water pond 6 and the float chamber 7 is provided with a fixing member 35 that extends in the upstream direction from the upper portion thereof.
The lower rotary arm 37 is formed in a substantially oval shape, and a shaft portion 36 is fixed to the downstream end portion thereof. The shaft portion 36 is rotatably supported by the upstream end portion of the fixing member 35, and The lower rotary arm 37 is supported by the fixed member 35 so as to be rotatable about the shaft portion 36. On the other hand, the upstream end portion of the link member 34 is pivotally attached to the shaft portion 38 fixed to the upstream end portion of the lower rotary arm 37. Here, the length of the link member 34 can be easily set to an appropriate length on site.
Further, a water injection tank fixing member 39 is fixed to the lower rotary arm 37 at a lower position through which the shaft portion 38 is inserted, and the lower end of the water injection tank fixing member 39 has a dustproof wave-proof cylinder that covers the outer periphery of the water injection tank 8. It is fixed to the side wall of 8b.

Next, the operation of the over-response prevention device for the upstream water level control gate according to the present invention will be described with reference to FIGS.
First, when the float 5 and the connecting rod 19 are raised, the link member 32 and the upper rotating arm 33 connected to the connecting rod 19 rotate clockwise about the shaft portion 26 and at the same time the upstream end of the upper rotating arm 33. The link member 34 connected to the part rotates in the clockwise direction at a predetermined rotation angle corresponding to the rotation amount of the upper rotary arm 33. Then, the lower rotary arm 37 fixed to the downstream end of the link member 34 rotates clockwise about the shaft portion 36 and is connected to the lower rotary arm 37 via a water injection tank fixing member 39. The water injection tank 8 rises.

That is, when the water level of the still water basin 6 exceeds the upper end 8a (upstream lower limit water level surface 40) of the water injection tank 8, water begins to flow into the water injection tank 8, and the float 5 rises and is proportional to the amount of rise of the float 5. When the water injection tank 8 also rises, and then the water level of the still water pond 6 gradually rises from the upstream lower limit water level surface 40, the water injection tank 8 gradually rises in conjunction with the float 5, so that the water flowing into the water injection tank 8 When the amount of water gradually decreases, the door body 3 interlocked with the float 5 gradually rises in response to the change in the water level of the upstream water channel 2a, and when the water level reaches the upstream upper limit water level surface 41, Fully open.
Thereby, as the water level rises from the upstream lower limit water level surface 40, the door body 3 does not operate rapidly and gradually rises in response to a change in the water level, so that the door body 3 rises excessively (too much opening). Can be prevented, and the upstream water level can be appropriately maintained.
Further, when the water level reaches the upper end 8a of the water injection tank 8 and water flows into the water injection tank 8, the water injection tank 8 also rises in proportion to the amount of rise of the float 5, so that swells, waves, etc. occurred at that water level. Even in this case, since water does not flow into the water injection tank 8 at a stretch, the door body 3 can maintain a stable state without over-response, and the upstream water level can be appropriately maintained.

  On the other hand, when the float 5 and the connecting rod 19 are lowered, the link member 32 and the upper rotating arm 33 connected to the connecting rod 19 rotate counterclockwise around the shaft portion 26 and at the same time upstream of the upper rotating arm 33. The link member 34 connected to the end portion rotates counterclockwise at a predetermined rotation angle corresponding to the rotation amount of the upper rotary arm 33. Then, the lower rotary arm 37 fixed to the downstream end portion of the link member 34 rotates counterclockwise about the shaft portion 36, and is connected to the lower rotary arm 37 via a water injection tank fixing member 39. The water injection tank 8 is lowered.

That is, when the water level of the still water basin 6 gradually decreases from the upstream upper limit water level surface 41 that is the upper end of the water injection tank 8, the water level in the float chamber 7 decreases, and at the same time the float 5 begins to descend, Since the water injection tank 8 also descends in proportion, the amount of water flowing into the water injection tank 8 gradually increases, and the door body 3 interlocked with the float 5 gradually descends in response to the change in the water level, When the water level reaches the upstream lower limit water level surface 40, the fully closed state is reached.
As a result, as the water level drops from the upstream upper limit water level surface 41 to the upstream lower limit water level surface 40, the door body 3 does not operate rapidly but gradually falls in response to the change in the water level. Down (too close) can be prevented, and the upstream water level can be maintained appropriately.

  Therefore, the upstream set water level fluctuates by the difference between the upstream upper limit water level 41 and the upstream lower limit water level 40. If the difference is large, the door body 3 tends to move stably, and if the difference is small, the door body. 3 is unstable movement. The difference between the upstream upper limit water level 41 and the upstream lower limit water level 40 is determined in consideration of the water intake conditions upstream of the door body 3, the influence on the downstream side, and the like.

As described above, according to the over-response prevention device for the upstream water level control gate according to the embodiment of the present invention, as the float 5 moves up and down, the water injection tank 8 moves up and down in proportion to its operation amount. When the water level rises from the upstream lower limit water level surface 40, the water injection tank 8 also rises in proportion to the rise amount of the float 5, and the water flowing into the water injection tank 8 gradually decreases, so the door body 3 changes in water level. It becomes possible to rise gradually corresponding to. Further, when the water level starts to descend from the upstream upper limit water level surface 41, the water injection tank 8 also descends in proportion to the descending amount of the float 5, and the water flowing into the water injection tank 8 gradually increases. It is possible to gradually descend in response to a change in the water level, and it is possible to prevent excessive movement of the door body 3 that is too open and closed.
Further, when the water level reaches the upper end 8a of the water injection tank 8 and water flows into the water injection tank 8, the water injection tank 8 also rises in proportion to the rising amount of the float 5, so that swells, waves, etc. are generated at that water level. However, water does not flow into the water injection tank 8, and the door 3 is less likely to over-respond to swells and waves.

  In addition, although the inflow control means demonstrated the structure which controls inflow of the water into the water injection tank 8 by the connection means 31 which raises / lowers the water injection tank 8 with the vertical motion of the float 5, it fixed the water injection tank 8 Then, a valve is provided at the opening of the upper end 8 a of the water injection tank 8, this valve is connected to the float 5, and the valve is opened and closed in conjunction with the vertical movement of the float 5. It is also possible to control the inflow of water.

  INDUSTRIAL APPLICABILITY The present invention is particularly effective as a device that appropriately adjusts the water level on the upstream side of waterways and rivers where waves and waves are likely to occur on the upstream side.

FIG. 1 is a side view of an over-response prevention device for an upstream water level control gate according to an embodiment of the present invention. FIG. 2 is a side view showing a state where the door of the over-response prevention device for the upstream water level control gate according to the embodiment of the present invention is fully closed. FIG. 3 is a side view showing a state where the door body of the over-response prevention device for the upstream water level control gate according to the embodiment of the present invention is fully opened. FIG. 4 is a plan view of the over-response prevention device for the upstream water level control gate according to the embodiment of the present invention. FIG. 5 is a cross-sectional view taken along line AA in FIG. FIG. 6 is a side view of a conventional upstream water level control gate.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Upstream water level control gate 2 Water channel 3 Door body 4,22 Rotating shaft 5 Float 6 Still water pond 7 Float chamber 8 Water injection tank 18a Outlet 31 Connecting means 19 Connecting rod 32, 34 Link material 33 Upper rotating arm 37 Lower rotating arm

Claims (3)

A rotary shaft that is connected to a door body that can open and close the water channel and that crosses the water channel, a float that rotates the rotary shaft by up and down movement by buoyancy and moves the door body up and down, and a float that is provided on the side of the water channel A float chamber that houses the float chamber, a static water pond that is provided upstream of the float chamber, communicates with the float chamber and communicates with a water channel upstream of the door body, and is disposed in the still water pond and communicates with the float chamber In the over-response prevention device of the upstream water level control gate provided with a water injection tank and an outlet provided in the float chamber,
An upstream response prevention device for an upstream water level control gate, comprising an inflow control means for controlling the inflow of water into the water injection tank as the float moves up and down. The inflow control means arranges the water injection tank so as to be movable up and down, connects the water injection tank and the float with a connection means, and an operation amount proportional to the operation amount with the vertical movement of the float. 2. The upstream water level control according to claim 1, wherein the water level is transmitted to the water injection tank via the connecting means, and the water injection tank is moved up and down to control the inflow of water into the water injection tank. Gate over-response prevention device. The connecting means is connected to a connecting rod extending above the float via a link member, and rotates with a pivot member around the fulcrum as the connecting rod moves up and down, and a link member is attached to the upper rotating arm. The upstream water level control gate according to claim 2, further comprising a lower rotary arm that is connected via a rotary shaft that rotates around a fulcrum in proportion to the amount of rotation of the upper rotary arm and raises or lowers the water injection tank. Over-response prevention device.

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