JP2004084319A - Lifting gate type water intake device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem of a conventional lifting gate type water intake device wherein because the lifting gate is held only in two positions, one in which it fully opens an intake and the other in which it fully closes the intake, the amount of water flowing out of the intake varies depending on the level of water, requiring workers to go to the site of installation in order to release the lifting gate from its closed state. <P>SOLUTION: The lifting gate type water intake device uses a lifting gate 12 to open and close an intake 15 provided in a sidewall 14 of a water reservoir 13. A floating gate which moves up and down using buoyancy as the level of water varies is used as the lifting gate 2. A recess 22 for the overflow of water is provided at the center position of the upper half of the floating gate 2. The buoyancy of the floating gate 2 is set so that the overflow surface 23 of the recess 22 is maintained at a predetermined depth of water from the surface of water. Thus, even if the level of water in the water reservoir 13 varies, water is taken in by an almost fixed amount, and the intake 15 is opened and closed without electric power and human assistance. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a lifting gate type water intake device for extracting a predetermined amount of water separated from a water source, and more particularly, for example, when a water source is used in a mountain stream in a mountainous region as in a case where water is taken into equipment of a hydroelectric power plant. The present invention relates to a lifting gate type water intake device capable of automatically adjusting and limiting the water intake amount even in a place where there is no power supply.
[0002]
[Prior art]
When water was taken into the facilities of the hydroelectric power plant, mountain stream water was used. As an example of the water intake method in this case, there is a conventional one employing a lift gate type water intake device as shown in FIG.
[0003]
Conventional lifting gate type intake apparatus shown in FIG. 8, as shown in FIG. 7, the inner surface of the side wall 14 of the reservoir 13 for temporarily storing the divided water flow W ₁ from stream water W ₀ flowing streams 1 Provided. In FIG. 7, a dam 11 is provided in the mountain stream 1, a diversion channel 12 is connected near the upstream side thereof, and a water storage tank 13 is provided downstream of the diversion channel 12. In the vicinity of the water storage tank 13, an intake channel 16 is provided with a side wall 14 therebetween, and water of an allowable limit water level L ₀ (FIG. 8) or more is overflowed to a part of the side wall (opposite to the lift gate installation part) (reference numeral). W ₄ ) An overflow weir 17 is provided. A water inlet 15 having a predetermined opening area is formed on a side wall 14 between the water storage tank 13 and the water intake passage 16. The opening area of the water intake 15 is designed based on the maximum water intake per hour. Incidentally, Tosuiro 16 is for guiding to a power plant that requires use water W ₂ taken out from the intake 15.
[0004]
However, mud flows into streams 1 during mass rainfall diverted water W ₁ flowing from the distribution canals 12 in the water tank 13 is also made into a large amount of mud-mixed, such mud as use water power plant equipment It is not preferable to take water to the water intake channel 16 side. Also, in this case (at the time of heavy rainfall), the water volume in the water storage portion of the mountain stream 1 increases, so that a large amount of water also flows into the water storage tank 13, and the water level in the water storage tank 13 sequentially increases. The higher the water level of the water storage tank 13 is, the larger the amount of water flowing out from the water intake 15 per hour is. However, when installing this kind of water intake equipment, the maximum water intake per hour from the mountain stream 1 is determined in advance. It is often set (for example, the amount of water withdrawal per hour is often limited by a contract with a water right holder). Therefore, the water level is permitted height within the reservoir 13 (in the case of FIG. 8 is the height of the code L ₁₎ at which point, it is necessary to close the intake port 15. For example, when the maximum water intake is limited to 0.1 m3 / s, for example, when the opening width of the water intake 15 is 0.6 m and the flow velocity of the water passing through the water intake 15 is 1.5 m / s, intake maximum allowable water level _{L 1} in the water tank 13 becomes up to about 0.11m from the bottom height of the water inlet 15 (the height of the sign _{L 2).}
[0005]
Against this background, in the conventional lift gate type water intake device shown in FIG. 8, a lift gate 2A for opening and closing the water intake 15 is provided on the inner surface of the side wall 14 of the water storage tank 13, and the lift gate 2A is closed in the closing direction (upward movement). Side) is equipped with a gravity type operation device to be operated. Gravity handling device, the outer surface of the overflow weir 17, as well as placing the container 51 for receiving water W ₃ overflowing from the overflow weir 17, the the container 51 and the lift gate 2A through pulleys 52, 53 wire 54 It is composed by connecting with. Overflow water W ₃ to flow into the container 51 flows out of the notch 17a formed in the top of the overflow weir 17 when the water level in the water tank 13 has reached a predetermined high water level L ₁ slightly lower than the limit level L ₀ It has become.
[0006]
The conventional lifting gate type water intake device shown in FIG. 8 operates as follows. When the inside of the container 51 is empty, the weight of the lift gate 2A is heavier than the weight of the container 51, and the position of the lift gate 2A is held at the lower position where the water intake port 15 is completely opened by the weight balance. When the water level in the water storage tank 13 exceeds the bottom height (reference L ₂ ) of the water intake 15, the water in the water storage tank 13 sequentially passes through the water intake 15 and the water intake passage 16 as indicated by the reference W _2. Spill to the side. Amount of water effluent W ₂ from the intake port 15 will vary with the height of the water level in the water storage tank 13 increases as the water level rises. Then, as in the case of heavy rainfall, when the amount of water flowing into the water storage tank 13 increases and reaches a predetermined high water level L ₁ slightly lower than the limit water level L ₀ , the overflow water W from the notch portion 17 a of the overflow weir 17 becomes large. ₃ flows into the container 51, and the weight of the container 51 becomes heavier than the weight of the lift gate 2A. Then, due to the reversal of the weight balance, the container side moves downward as shown by a dashed line (reference numeral 51 '), while the up / down gate moves up as shown by a dashed line (reference numeral 2A'), and the intake port 15 moves up and down. Complete blockage occurs at 2A '. Even after the intake port 15 is closed, flow is diverted water W ₁ in the water tank 13 from the mountain stream 1 side, the height of the water level in the該貯aquarium 13 exceeds the top of the overflow weir 17 (code L ₀ becomes the water level or higher), the excess water will overflow as indicated at W ₄ from the top of the overflow weir 17.
[0007]
[Problems to be solved by the invention]
However, the lifting gate type water intake device shown in FIG. 8 has the following problems.
[0008]
(1) Since the lift gate 2A is held at only two positions, that is, a state in which the intake port 15 is fully opened and a state in which the intake port 15 is fully closed, the water level in the water storage tank 13 is set at the bottom of the intake port 15 when the intake port 15 is open. up to a height reaching the notch 17a height (code L ₂ of the water level) from the overflow weir 17 (the water level of the code L ₁₎ is water flowing out of the intake port 15 by the height of the water level varies.
[0009]
(2) those water inlet 15 thus during intake of remains fully open, the limit of the allowable water intake as described above (m3 / s), the water level L ₂ in the example of extractable water level range (FIG. 8 range of the water level _{L 1)} is narrowed. That is, the water level in the water tank 13 to the extent that precipitation is slightly many will reach the intake limit water level L _1, Then lift gate 2A contains overflow water W ₃ in the container 51 is closing (fully closed) Water can be taken only in a narrow water level range.
[0010]
(3) When the container 51 lift gate 2A contains overflow water W ₃ in the works closed, even if subsequently lowered water level in the water storage tank 13, since the intake port 15 is maintained in the fully closed state, In order to resume water intake, it is necessary for a person to go to the installation site and perform the work of discharging the water in the container 51, and it is not possible to take water from the water intake port 15 until the work of discharging the water in the container 51 is performed. It becomes.
[0011]
(4) Since the closing operation of the lift gate 2A is performed by another gravity type operation device (the container 51, the pulleys 52 and 53, the wire 54, and the like), the installation range of the means is widened and the operation of the device is widened. The structure becomes complicated.
[0012]
Then, this invention is made for the purpose of improving each problem of the above-mentioned conventional lifting gate type water intake device.
[0013]
[Means for Solving the Problems]
The present invention has the following configuration as means for solving the above problems.
[0014]
The invention of claim 1 of the present application The invention of claim 1 of the present application provides an intake port on a side wall of a water storage tank for temporarily storing water separated from a water source, and opens and closes the intake port with a lift gate. It is intended for a lift gate type water intake device that can be obtained. In addition, the water intake port is generally in a horizontally long rectangular shape, and is formed in a horizontal hole shape penetrating the side wall of the water storage tank.
[0015]
In the lift gate type water intake device of the first aspect, a floating gate that moves up and down by buoyancy in response to a change in water level is used as the lift gate. This floating gate can employ a steel plate tank (floating body) whose internal space is sealed. The floating gate moves up and down while being guided by a guide device, with the rear surface of the floating gate being in sliding contact with the edge of the water intake. Incidentally, packing for watertightness is usually provided on the edge of the water intake port and on the rear surface of the floating gate.
[0016]
At the center of the upper half of the floating gate, a recess for water overflow is provided. The overflow recess is provided at a position corresponding to the intake of the water storage tank. The bottom surface of the overflow recess serves as an overflow surface to the intake port side. The lower portion of the rear surface of the floating gate than the overflow surface serves as a lid surface that can block the intake port.
[0017]
Further, in this lifting gate type water intake device, the buoyancy of the floating gate is set such that the overflow surface of the overflow recess is maintained at a predetermined depth from the water surface. The water depth of the overflow surface is an element that determines the amount of water taken per hour together with the width of the overflow recess.However, by adjusting the weight, the buoyancy of the floating gate is adjusted, and the overflow surface is adjusted to a desired level. Can be set to water depth.
[0018]
In the lift gate type water intake device, when the water level in the water storage tank rises and reaches a predetermined high water level (allowable limit water level), the floating gate is held at a position where the water intake port is fully closed. I have. The position of the floating gate in the fully closed position can be held by a stopper that prevents the floating gate from moving upward.
[0019]
The lifting gate type water intake device according to claim 1 of the present application functions as follows. That is, when the water level rises until the buoyancy of the floating gate is generated in the water storage tank, the floating gate floats on the water surface due to the buoyancy. At this time, the overflow surface of the overflow recess is submerged to a predetermined water depth. The water depth of this overflow surface is constant (unchanged) because the floating gate moves up and down in response to the fluctuation of the water level in the water storage tank. Accordingly, in the range where the height of the overflow surface is equal to or higher than the height of the bottom surface of the intake port and the overflow surface limits the opening height of the intake port, the amount of water flowing from the overflow recess to the intake side is It will be constant.
[0020]
By the way, during heavy rainfall, muddy water flows into the mountain stream, and the muddy water flows into the water tank. Going up. When the water level in the reservoir reaches the permissible limit, the overflow surface of the floating gate has risen to the height of the upper edge of the intake, and the lower part of the overflow surface (cover surface) The entire area is blocked. When the lower rear portion (cover surface) of the overflow surface completely closes the intake port, the floating gate abuts against the stopper, and the floating gate is maintained so as not to move further. Also, even after the floating gate completely blocks the intake, water from the mountain stream side may flow into the water storage tank, but the increased water in the water storage tank flows over the overflow weir (downstream from the dam). Side).
[0021]
On the other hand, when the rain stops and the water stops flowing from the mountain stream side to the water tank side, the sediment components in the muddy water flowing into the water tank settle down in a relatively short time, and the clean water is naturally purified. You. Also, when the water level on the mountain stream side falls below the height of the overflow weir in the water tank, the water level on the water tank side drops and the floating gate automatically lowers. Then, when the floating gate descends until the intake is opened, intake from the intake is restarted.
[0022]
The invention of claim 2 of the present application In the invention of claim 2 of the present application, in the lift gate type water intake device of claim 1, a guide device for guiding the floating gate to be able to move up and down is installed at a position above the water surface.
[0023]
As the guide device for the floating gate, for example, a device in which a slide rod (two right and left) attached to the floating gate side can be slid up and down with respect to a guide cylinder fixed to the side wall side can be adopted. The slide part between the slide bar and the guide tube is installed above the water surface.
[0024]
【The invention's effect】
Effect of the invention of claim 1 of the present application The lift gate type water intake device of the invention of claim 1 of the present application has the following effects.
[0025]
{Circle around (1)} A floating gate which moves up and down by buoyancy in response to a change in water level is used as a lift gate, and the overflow surface of the overflow recess formed in the floating gate is maintained at a predetermined depth from the water surface. Therefore, the amount of water taken from the water intake can be made substantially constant irrespective of the fluctuation of the water level in the water storage tank at the time of water intake.
[0026]
{Circle around (2)} As described above, if the water intake from the water intake can be made constant regardless of the water level of the water storage tank, the height range of water intake from the water intake can be increased, and for example, muddy water is generated even during heavy rainfall. By taking water from a water source (mountain stream) that is difficult to do, the available water level range of fresh water can be expanded.
[0027]
(3) Since a floating gate that moves up and down due to buoyancy is used, if the water level in the water storage tank decreases after the intake port is closed, the floating gate automatically lowers (water intake from the water intake port can be resumed). The opening and closing of the water intake can be automatically performed with no power and unattended.
[0028]
{Circle around (4)} Since the floating gate moves up and down by its own buoyancy, external means for opening and closing the floating gate is not required, and the entire lifting gate type water intake device can be made compact.
[0029]
Effect of the invention of claim 2 In the invention of claim 2 of the present invention, in the lift gate type water intake device of claim 1, a guide device for guiding the floating gate so as to be able to move up and down is installed at a position above the water surface. Therefore, in addition to the effect of the first aspect, there is no foreign matter (for example, leaves or tree branches) in water adhered to or entangled with the guide device portion (no clogging of the guide device portion occurs). When the floating gate does not move up and down due to the cause, it can be repaired in the air, so that there is an effect that maintenance of the guide portion of the floating gate becomes easy.
[0030]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to FIGS. 1 to 6. The lift gate type water intake device of this embodiment is for supplying water to equipment of a hydroelectric power plant, and utilizes a mountain stream 1 as a water source. ing.
[0031]
That is, the lift gate type intake apparatus of this embodiment, as shown in FIG. 1, is provided on the inner surface of the side wall 14 of the reservoir 13 for temporarily storing the divided water flow W ₁ from stream water W ₀ flowing streams 1 ing. In FIG. 1, a dam 11 is provided in the mountain stream 1, a diversion channel 12 is connected near the upstream side thereof, and a water storage tank 13 is provided downstream of the diversion channel 12. An intake passage 16 is provided near the water storage tank 13 with a side wall 14 interposed therebetween.
[0032]
On a side wall 14 between the water storage tank 13 and the water intake passage 16, an intake port 15 opening in a horizontally long rectangle is formed at a position substantially at an intermediate height of the side wall 14. The water intake port 15 penetrates the side wall 14 and connects the water storage tank 13 to the water intake passage 16. Although the opening area of the water intake 15 is not particularly limited, in the embodiment, the horizontal width is about 60 cm, and the vertical width is about 20 cm. Incidentally, Tosuiro 16 is for guiding to a power plant that requires use water W ₂ taken out from the intake 15.
[0033]
The side surface of the side wall 14 on the water tank 13 side is inclined outward by a slight angle (about 5 ° with respect to the vertical plane). A frame 18 is attached to a side surface of the side wall 14 on the water tank 13 side at a position corresponding to the water intake port 15. The frame 18 has a horizontally long rectangular opening 19 communicating with the water intake 15.
[0034]
An overflow weir 17 (FIG. 1) for overflowing water (reference symbol W _{4 in} FIG. 1) at a part of a side wall facing the water intake port 15 in the water storage tank 13 to or above an allowable limit water level L ₀ (FIGS. 4 and 6). Is provided.
[0035]
The lifting gate type water intake device of the embodiment shown in FIGS. 2 to 6 uses a floating gate 2 which moves up and down by buoyancy in response to a change in water level as the lifting gate. The floating gate 2 employs a floating body 21 made of a steel plate tank with an internal space closed. The floating gate 2 is not particularly limited, but can be formed in a box shape having a width of 140 cm, a height of 100 cm, and a depth width of about 40 cm.
[0036]
At the center of the upper half of the floating gate 2, a water overflow recess 22 is provided. The overflow recess 22 has the same width (about 60 cm) as the left and right widths of the water intake 15 and a depth of about 50 cm. The bottom surface of the overflow recess 22 becomes an overflow surface 23 of water. The overflow recess 22 is provided with a lattice-shaped foreign matter blocking fence 6 extending over the front and top surfaces thereof.
[0037]
The floating gate 2 is guided by the pair of left and right guide devices 3 and 3 so as to be able to move up and down at a position corresponding to the overflow recess 22 corresponding to the water inlet 15. Each of the guide devices 3, 3 has slide bars 31, 31 attached to the left and right outer surfaces of the floating body 21, and two left and right guide cylinders 32 fixed to the side wall 14 side. It is inserted through the guide cylinders 32, 32. The slide rod insertion holes of the guide cylinders 32, 32 are inclined at the same inclination angle as the frame 18 attached to the side wall 14, so that the rear surface of the floating body 21 moves vertically parallel to the frame 18. It is possible to do. When the floating gate 2 is guided by the guide devices 3 and 3 (slightly inclined), the overflow surface 23 is formed to be a horizontal plane.
[0038]
Each of the guide devices 3, 3 is installed above the water surface so that foreign substances (for example, leaves and tree branches) floating in the water can be prevented from adhering to or entangled with the slide portion. I have. In addition, when the guide devices 3 and 3 are installed above the water surface in this way, the guide device 3 can be repaired in the air if any trouble occurs in the guide device for any reason.
[0039]
On the front surface of the frame 18, vertically long packings 41, 41 are respectively provided at left and right edge positions of the opening 19, and horizontal packings 41 a, 41 a are respectively mounted at upper and lower edge positions of the opening 19 in a continuous state. . On the other hand, on the rear surface of the floating body 21, two left and right vertical packings 42, 42 slidably contacting the vertical packings 41, 41 on the frame 18 side at the left and right edge positions of the overflow recess 22, respectively, and the horizontal packings 41 a. , 41a, and the horizontal packings 42a, 42a that match with each other are mounted in a continuous state. Metal packing is used for the packings 41, 41a, 42, 42a on each side. When the floating gate 2 is moved up and down, the vertical packings 41 and 41 on the frame 18 and the vertical packings 42 and 42 on the floating body 21 are in sliding contact with each other. Is moved upward to the position where it is closed (the state shown in FIG. 6), the upper and lower horizontal packings 42a, 42a on the floating body 21 abut against the upper and lower horizontal packings 41a, 41a on the frame 18 side, and the opening is closed. 19 can be closed in a watertight manner. The packing on each side has an appropriate contact pressure to prevent chattering and fluttering of the floating body 21 due to water flow, wave motion, water level fluctuation, and the like.
[0040]
The buoyancy of the floating gate 2 is set such that the overflow surface 23 of the overflow recess 22 is maintained at a predetermined depth from the water surface in a state of being floated in the water. The water depth M of the overflow surface 23 (FIGS. 4 and 6) is an element that determines the amount of water withdrawal per hour together with the width of the overflow recess 22. By adjusting the weight, the floating gate 2 (floating body) is adjusted. By adjusting the buoyancy of 21), the overflow surface 23 can be set to a desired water depth. In the illustrated embodiment, the water depth M of the overflow surface 23 is set to about 10 cm.
[0041]
At the lower end of the frame body 18 attached to the side surface of the side wall 14, there are provided receiving stands 34, 34 for supporting the floating gate 2 from below at a predetermined lowering position. In this embodiment, the receiving trays 34, 34 are located at a position where the overflow surface 23 of the overflow recess 22 is flush with the lower edge of the water intake 15 (frame opening 19) as shown in FIG. It is positioned so as to receive the lower surface of the floating body 21.
[0042]
Stoppers 35, 35 for regulating the upward movement position of the floating gate 2 are provided at positions near the upper portion of the frame 18. As shown in FIG. 6, each of the stoppers 35, 35 raises the upper surface of the floating body 21 when the floating gate 2 is moved up to the closed position (the position around the opening 19 is closed by the packing on the floating body 21 side). The floating gate 2 is restricted so as not to move further.
[0043]
A rectifying plate 7 for preventing the inflow water from directly colliding with the floating gate 2 is provided on a side of the floating gate 2 on the water inflow side in the water storage tank 13.
[0044]
The lifting gate type water intake device of this embodiment functions as follows. First, when the water level in the water tank 13 is less than code L ₃ of Figure 4 is seated on the cradle 34 floating gate 2 by its own weight, then the overflow surface 23 water inlet 15 (the frame opening 19) And the water intake 15 (frame opening 19) is maintained in a fully open state. Therefore, when the water level in the water storage tank 13 exceeds the overflow surface 23, the excess water level flows out to the intake channel 16 side through the overflow surface 23, the frame body opening 19, and the intake port 15.
[0045]
When the mountain stream water increases due to heavy rainfall or the like, a part of the water flows into the water storage tank 13 side, and the water level in the water storage tank 13 rises. Then, the water level until the buoyancy of the water tank 13 in the floating gate 2 is generated to increase the (water level exceeds the L ₃ in Fig. 4), although the floating gate 2 is floating on the water surface by buoyancy, the floating gate 2 is floating state Then, the overflow surface 23 always maintains a constant (unchanged) water depth M. Therefore, in a range where the height of the overflow surface 23 is equal to or higher than the lower edge of the intake port 15 (frame opening 19) and the overflow surface 23 limits the opening height of the intake port 15, The amount of water flowing from the diversion recess 22 to the water intake 15 is constant.
[0046]
By the way, at the time of heavy rainfall, the amount of water flowing into the water storage tank 13 from the mountain stream side becomes larger than the amount of water flowing out from the water intake port 15, and the water level in the water storage tank 13 gradually rises. Move up due to buoyancy. At the time of heavy rainfall, muddy water flows into the mountain stream, and the muddy water also flows into the water storage tank 13. Then, when the water level in the water storage tank 13 reaches the allowable limit water level (reference symbol L _{0 in} FIG. 6), the overflow surface 23 of the floating gate 2 is connected to the intake port 15 (frame opening 19) as shown in FIG. The rectangular packing portion (the portion surrounded by 42, 42, 42a, 42a) on the rear surface portion of the floating body 21 is raised to the upper edge height, and the rectangular packing portions (41, 41, 41a, 41a) around the frame opening 19 are formed. ) To block the entire area of the water intake 15 (frame opening 19). At this time, the upper surface of the floating gate 2 (the floating body 21) abuts against the stoppers 35, 35, so that the floating gate 2 is maintained so as not to move upward. Further, even after the floating gate 2 completely closes the intake port (frame opening 19), water from the mountain stream side may flow into the water storage tank 13, but the increased water in the water storage tank 13 is overflow overflow dam. It is returned to the mountain stream (downstream from the dam 11) beyond 17 (FIG. 1).
[0047]
Then, when the rain stops and water stops flowing from the mountain stream side to the water storage tank 13 side, the sediment components in the muddy water flowing into the water storage tank 13 settle down in a relatively short time, and the clean water is naturally purified. Is done. Further, when the water level on the mountain stream side is lower than the height of the overflow weir 17 of the water storage tank 13, the water level on the water storage tank 13 side is reduced, and when the water level in the water storage tank 13 is lower than L ₀ (FIG. 6), The floating gate 2 automatically lowers. Then, when the floating gate 2 descends until the upper side of the water intake 15 (frame opening 19) is opened, water intake from the water intake 15 is resumed.
[0048]
As described above, in the lifting gate type water intake device of the present application, the floating gate 2 automatically moves up and down due to the fluctuation of the water level in the water storage tank 13, so that the water intake port 15 can be opened and closed with no power and unmanned. In addition, since the floating gate 2 moves up and down with the water depth M of the overflow surface 23 being constant, the amount of water taken from the water inlet 15 is almost constant in a normal water intake state regardless of the fluctuation of the water level in the water storage tank 13. Can be Furthermore, if the amount of water taken from the water inlet 15 can be made constant regardless of the water level in the water storage tank 13, the range of water levels that can be taken from the water inlet 15 can be expanded. Further, when the guide devices 3 and 3 for guiding the floating gate 2 so as to be able to move up and down are installed above the water surface, foreign substances (for example, leaves and tree branches) in the water do not adhere to or become entangled with the guide device. Moreover, when the floating gate does not move up and down for some reason, it can be repaired in the air.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a water intake facility using a lifting gate type water intake device according to an embodiment of the present application.
FIG. 2 is a front view (an II-II enlarged view in FIG. 1) of the lift gate type water intake device of the embodiment of the present application.
FIG. 3 is a plan view of FIG. 2;
FIG. 4 is a sectional view taken along line IV-IV of FIG. 2;
FIG. 5 is an exploded perspective view of the lifting gate type water intake device according to the embodiment of the present application.
FIG. 6 is a state change diagram from FIG.
FIG. 7 is an explanatory view of a water intake facility using a conventional lifting gate type water intake device.
FIG. 8 is a sectional view taken along line VIII-VIII of FIG. 7;
[Explanation of symbols]
1 is a water source (mountain stream), 2 is a floating gate, 3 is a guide device, 13 is a water storage tank, 14 is a side wall, 15 is an intake port, 16 is an intake channel, 17 is an overflow weir, 18 is a frame, and 19 is a frame. An opening, 21 is a floating body, 22 is an overflow recess, 23 is an overflow surface, 31 is a slide bar, and 32 is a guide cylinder.

Claims (2)

A water intake (15) is provided on a side wall (14) of a water storage tank (13) for temporarily storing water separated from a water source (1), and the water intake (15) is opened and closed by a lifting gate (2). A lifting gate type water intake device,
As the lift gate (2), a floating gate that moves up and down by buoyancy in response to a change in water level is used,
A water overflow recess (22) is provided at the center of the upper half of the floating gate (2),
The buoyancy of the floating gate (2) is set such that the overflow surface (23) of the overflow recess (22) is maintained at a predetermined depth from the water surface,
When the water level in the water storage tank (13) reaches a predetermined high water level, the floating gate (2) is held at a position where the water intake (15) is fully closed.
A lifting gate type water intake device, characterized in that: 2. A lift gate type water intake device according to claim 1, wherein a guide device (3) for guiding the floating gate (2) up and down freely is installed above the water surface.

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