JP7347040B2 - corner drop gate - Google Patents

Description

The present invention relates to a corner drop gate provided at a waterway downstream of a dam, such as a water outlet.

At a hydroelectric power plant, when workers enter a waterway for periodic inspections of the waterway, etc., they perform drainage work to drain water from the waterway before entering the waterway. For example, when draining a waterway from a generator to a water outlet, a drop-off gate is installed at the water outlet to prevent water from entering from the downstream river, and a submersible pump installed in the waterway is used. The water in the spillway is discharged into the river. The drainage hose that discharges the water sucked in by the submersible pump is connected to the submersible pump at one end, and routed through an opening provided at a predetermined position in the corner drop gate so that the other end is located in the river downstream. be done.

Conventional corner drop gates use multiple wooden squares connected in the width direction, and are installed in multiple stages along the water depth direction to prevent water from entering from downstream rivers. The opening for routing the drainage hose is, for example, made by cutting out a part of the square timber that makes up the topmost wooden corner gate installed in multiple stages of wooden corner gates. ing.

As a conventional technology related to a corner drop gate, for example, a gate body is provided with a water hole in the frame body and a flap that opens toward the outside of the embankment and closes toward the inside of the embankment is attached to the water flow hole. A technique for installing a plurality of devices vertically in a doorway has been disclosed (for example, see Patent Document 1 below). In addition, a technology has been disclosed in which a drainage pump is built into the lower corner cutout, a discharge flow path for the drainage pump is provided in the middle corner cutter, and a discharge port for the drainage pump is provided in the upper corner cutout (for example, the following (See Patent Document 2.)

JP2017-025610A Japanese Patent Application Publication No. 2001-026919

However, with conventional technology, fine machining is difficult with wooden corner drops, and the opening diameter of the opening is larger than the outside diameter of the hose, creating a gap between the hose and the hose routed inside the opening. . For this reason, if the river water rises during drainage work, there is a risk that river water will infiltrate (backflow) into the drainage channel through the gap. If river water flows backward into the spillway, the safety of workers working in the spillway may be compromised.

Further, in a configuration in which a drainage pump and a discharge flow path are incorporated in the corner drop, the structure becomes complicated and the weight increases, so that it cannot be easily handled. In addition, the positional relationship between the overlapping corners must be strictly controlled, which puts a heavy burden on the work.

In view of the above problems, it is an object of the present invention to be able to easily install a corner drop gate with a simple configuration, to reduce the burden on workers, and to ensure the safety of workers in the waterway.

In order to achieve the above object, the corner drop gate of the present invention is a corner drop gate installed in a water discharge gate at the boundary between a water discharge channel and a river, and is made of steel and is laminated in the door groove of the water discharge gate. a drain hose passage flange that is opened near the upper end of the uppermost watertight door and through which a drain hose for draining the water in the waterway into the river passes; and the drain hose. It is characterized by comprising a lid member that can be freely attached to and detached from the passage flange.

Further, the inner diameter of the inner peripheral edge of the drainage hose passage flange is equal to the outer diameter of the outer peripheral surface of the drainage hose.

The lid member is characterized in that it is removed at the time of drainage when the drainage hose passes through the drainage hose passage flange, and is attached to the drainage hose passage flange after the drainage or when the river water increases. do.

Each of the plurality of watertight doors is provided with a locking piece on the top plate for suspension during installation, a locking hole into which the locking piece fits into the bottom plate, and a locking hole in which the locking piece fits, and the door groove is provided with a locking hole in which the locking piece fits. The locking piece of the watertight door located at the bottom engages with the locking hole of the watertight door located at the top and is positioned in a state in which a plurality of the watertight doors are stacked inside the watertight door. do.

Further, when a plurality of the watertight doors are stacked in the door groove, the locking piece of the watertight door located at the bottom is fixed in the state engaged with the locking hole of the watertight door located at the top. It is characterized by being able to be fixed with a tool.

Further, the lid member is characterized in that it is removable from the watertight door on the side that receives water pressure on the river side.

Further, the watertight door is characterized in that guide hardware is attached to the side portions of the plurality of watertight doors to reduce contact with the door grooves.

Further, the watertight door is characterized in that watertight rubber is provided on the top and side surfaces of the plurality of watertight doors to stop water at each location.

Further, of the plurality of watertight doors, at least the lowermost watertight door has an engaging piece protrudingly formed therein, and the door groove has an engaging piece corresponding to the position of the engaging piece of the lowermost watertight door. An engaging piece that engages with the engaging piece in a wedge shape is formed to protrude and hold the lowermost watertight door in a positioned state.

Further, among the plurality of watertight doors, a fixing metal fitting is provided on the bottom surface of the lowest watertight door, and the watertight door can be fixed to a fixing metal fitting provided on the bottom surface of the door groove.

According to the above configuration, the plurality of watertight doors are formed of steel, and the weight of each watertight door applied when installed in the water discharge gate allows the watertight doors to form a wall surface in close contact with each other, and can be installed in the same manner as before. It is possible to reliably prevent water from entering. Moreover, the drainage hose can be reliably and stably supported by a simple structure in which the drainage hose is simply passed through the drainage hose passage flange formed on the watertight door. In addition, since the drain hose passage flange is provided only on the watertight door installed at the top level, the inner peripheral edge of the drainage hose passage flange can be positioned securely above the water surface without interfering with drainage by the submersible pump. It is possible to reliably prevent water from entering the waterway from the boundary between the drain hose and the outer peripheral surface of the drain hose.

Advantageous Effects of Invention According to the present invention, the corner drop gate can be easily installed with a simple configuration, reducing the burden on workers and ensuring the safety of workers in the waterway.

FIG. 1A is a front view showing an example of a corner drop gate according to an embodiment. FIG. 1B is a side sectional view showing an example of the corner drop gate according to the embodiment. FIG. 1C is a cross-sectional view taken along line AA in FIG. 1A. FIG. 2A is a top view showing a water discharge gate portion where a corner drop gate is installed. FIG. 2B is a sectional view of the water discharge gate portion. FIG. 3A is a diagram showing details of the watertight door according to the embodiment. (Part 1) FIG. 3B is a diagram showing details of the watertight door according to the embodiment. (Part 2) FIG. 4 is a partially enlarged plan view of the corner drop gate according to the embodiment. FIG. 5 is a partially enlarged side view of the corner drop gate according to the embodiment. FIG. 6 is a front view showing another configuration example of the watertight door according to the embodiment. FIG. 7 is a diagram illustrating water cutoff work for the entire waterway including the corner drop gate according to the embodiment.

(Embodiment)
DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a corner drop gate according to the present invention will be described in detail below with reference to the accompanying drawings.

1A is a front view showing an example of the corner drop gate according to the embodiment, FIG. 1B is a side sectional view showing an example of the corner drop gate according to the embodiment, and FIG. 1C is a line AA in FIG. 1A. FIG. EL in the figure indicates an example of altitude.

The corner drop gate 100 is made of metal, for example, steel, has a rectangular shape, and is constituted by a plurality of watertight doors (corner drops) 100a to 100d that are approximately equal in size (vertical and horizontal). In the illustrated example, there are four watertight doors 100a to 100d.

Among the plurality of watertight doors 100a to 100d, the watertight door 100a installed at the uppermost stage is provided with an open flange 110 for passage of a drainage hose that penetrates in the thickness direction.

The drainage hose passage flange 110 is formed in a circular shape, and the inner diameter of the inner peripheral edge is equivalent to the outer diameter of the outer peripheral surface of the drainage hose connected to the submersible pump. This drainage hose passage flange 110 is provided near the upper end of the watertight door 101a installed at the uppermost stage. By providing a drainage hose that passes through the drainage hose passage flange 110, water in one waterway (upstream waterway) can be discharged to the other (downstream river side) using the watertight door 100a as a boundary. I can do it.

The watertight door 100a includes a lid member 120 that closes the opening of the drainage hose passage flange 110. The lid member 120 prevents water from entering from the downstream waterway side (backflow) by blocking the drainage hose passage flange 110 portion with the lid member 120 before and after drainage work using the drainage hose of the submersible pump. can be prevented.

The plurality of watertight doors 100a to 100d of the corner drop gate 100 are provided in the water discharge gate 150 portion of the water discharge channel. The water discharge gate 150 has a predetermined size (length and width), and door grooves 151 into which the corner drop gate 100 is inserted from above are formed on both sides.

As shown in FIGS. 1A and 1B, the door groove 151 is provided to penetrate through the upper part of the working hole 152 of the water discharge gate 150, and the height of the door groove 151 is determined by the height of the plurality of watertight doors 100a of the corner drop gate 100. It is formed higher than the height when ~100 d is stacked vertically. A lid 152a is provided on the upper part of the working hole 152, and the lid 152a is removed only when installing the corner dropping gate 100, and a plurality of watertight doors 100a to 100d of the corner dropping gate 100 are installed from the upper part of the working hole 152.

Further, as shown in FIGS. 1A and 1C, the width between the pair of door grooves 151 is formed to be slightly larger than the width of the corner drop gate 100 (watertight doors 100a to 100d).

Here, the area indicated by the cross in FIG. 1A is the opening (spout) part of the water discharge gate 150, and by installing the corner drop gate 100 in the door groove 151 part, the water discharge gate 150 part can be temporarily closed off. I can do it. FIG. 1B illustrates the direction of water pressure applied from the downstream waterway side. Further, the symbol R in the figure is a door stop reference line that the corner drop gate 100 inserted into the door groove 151 of the water discharge gate 150 comes into contact with due to the water pressure on the downstream side.

The specific sizes of each of the above configurations are illustrated below. The opening height of the water discharge gate 150 shown in FIG. 1A is 3200 mm, the width is 3200 mm, and the width of the door groove between the pair of door grooves 151 is 3600 mm. Further, the door stop hole of the door groove 151 shown in FIG. 1B is 3350 mm, and the height of the door groove 151 to the upper working hole 152 is 4200 mm.

FIG. 2A is a top view showing a water discharge gate portion where a corner drop gate is installed, and FIG. 2B is a sectional view of the water discharge gate portion. The water discharge gate 150 is installed at the boundary between the water discharge channel 200 and the river 210, and the corner drop gate 100 is installed at the water discharge gate 150 portion.

At hydroelectric power plants, when workers enter a waterway, for example to perform periodic inspections of the waterway between the dam's water intake and the generator, they must drain the water in the waterway before entering the waterway. Perform drainage work to discharge.

During drainage work from the generator upstream of the waterway 200 to the waterway 200, a corner drop gate 100 is installed at a water release gate 150 portion. Thereby, the corner drop gate 100 prevents water from entering from the river 210 on the downstream side. At this time, the corner drop gate 100 receives water pressure from the river 210 side (corresponding to the water pressure direction in the figure). In this state, water in the waterway 200 is drained into the river 210 using a submersible pump installed in the waterway 200.

A drainage hose 250 that discharges water sucked by the submersible pump has one end (upstream side) connected to the submersible pump, and a drainage hose passage flange 110 provided at the top of the corner drop gate 100 at a midway position of the drainage hose 250. The other end is routed through the river 210 (downstream side). The submersible pump then discharges the water in the waterway 200 to the river 210. The figure shows a drainage direction A by the drainage hose 250. The drainage direction A is opposite to the water pressure direction that the corner drop gate 100 receives from the river 210.

Here, the drainage hose passage flange 110 is provided near the upper end of the watertight door 100a installed at the top of the corner drop gate 100, so that the drainage hose passage flange 110 is positioned above the water surface of the river 210. However, the drainage hose passage flange 110 is not subjected to the water pressure of the river 210. Moreover, even when the river 210 increases and the drainage hose passage flange 110 is located below the water surface of the river 210, the drainage hose 250 is provided at the drainage hose passage flange 110, and the drainage hose passage flange 110 Water on the river 210 side can be prevented from flowing into the spillway 200 side from this part.

When the water level of the river 210 increases, the water on the river 210 side can flow into the spillway 200 by removing the drain hose 250 from the drainage hose passage flange 110 and attaching the cover member 120 to the drainage hose passage flange 110. (reflux) can be prevented.

By draining the water in the waterway 200 into the river 210, the worker can inspect the waterway 200 portion. The corner drop gate 100 prevents water from the river 210 side from entering (reverse flow) into the waterway 200 when inspecting the waterway 200, and ensures the safety of workers performing inspection work within the waterway 200. Furthermore, even if the river rises, water from the river 210 side can be prevented from flowing into the waterway 200 through the drainage hose passage flange 110, thereby increasing the safety of workers performing inspection work inside the waterway 200. can be secured.

3A and 3B are diagrams showing details of the watertight door according to the embodiment. These figures show an example of the configuration of the uppermost watertight door 100a that constitutes the corner drop gate 100. The other watertight doors 100b to 100c have substantially the same configuration as the topmost watertight door 100a, except that the drainage hose passage flange 110 and the lid member 120 shown in FIGS. 3A and 3B are not provided.

3A(a) is a top view of the watertight door 100a, FIG. 3A(b) is a front view of the watertight door 100a (view from the side of the waterway 200), and FIG. 3A(c) is a bottom view of the watertight door 100a. It is a diagram. 3B(a) is a front view of the watertight door 100a (viewed from the river 210 side), FIG. 3B(b) is a side view of the watertight door 100a, and FIG. 3B(c) is the same as that of FIG. 3A(b). It is a sectional view taken along the line AA.

The watertight door 100a includes a front plate 300, a top plate 301, a pair of side plates 302, and a bottom plate 303 provided on the top, side, and bottom surfaces of the front plate 300, respectively. The top plate 301, the pair of side plates 302, and the bottom plate 303 have a width slightly smaller than the width of the door groove 151 of the water discharge gate 150.

A plurality of openings 305 are provided on the top surface and side surface (see FIG. 3B(b)) of the watertight door 100a shown in FIG. 3A(a), and the width of the top surface of the watertight door 100a (in the lateral direction in the figure). Watertight rubber 400 (see FIG. 4, which will be described later) provided over the entire area and the entire side surface is fixed and held using a fixture such as a bolt. The watertight rubber 400 is located between the plurality of watertight doors 100a to 100d, and is located between the stacked watertight doors 100a to 100d for waterproofing. Further, the watertight rubber 400 has a convex portion that protrudes by a predetermined amount from the side of the watertight door 100a, and is located between the door groove 151 and waterproof.

On the upper surface plate 301 of the watertight door 100a shown in FIG. 3A(a), locking pieces 306a for suspension are protrudingly formed at two locations in the width direction. By hanging a rope around this locking piece 306a and hanging it with a crane, the watertight door 100a can be installed in the door groove 151 from the working hole 152 of the water discharge gate 150.

In the bottom plate 303 of the watertight door 100a shown in FIG. 3A(c), locking holes 306b into which locking pieces 306a fit are formed at two locations in the width direction. When a plurality of watertight doors 100a to 100d are stacked at the water discharge gate 150, for example, the locking piece 306a of the lowest watertight door 100d fits into the locking hole 306b of the upper watertight door 100c, and the upper and lower watertight doors The positions of the doors 100c and 100d can be defined in the width direction. The locking pieces 306a fit into the locking holes 306b between the other watertight doors 100c and 100b and between the watertight doors 100b and 100a as well.

The vertically stacked watertight doors 100a to 100d are integrated into one corner drop gate 100 by fixing the locking piece 306a portion that fits into the locking hole 306b with a fixing device such as a bolt. be able to.

Further, as shown in FIGS. 3A(b) and 3B(c), L-shaped reinforcing frames 307 are provided in the vertical direction at multiple locations in the width direction of the watertight door 100a, four locations in the illustrated example. is provided to reinforce the overall strength of the watertight door 100a. Further, a plurality of drain holes 308 are provided in the bottom plate 303 of the watertight door 100a shown in FIG. 3A(c).

A circular drainage hose passage flange 110 is formed at the upper part of the front plate 300 of the watertight door 100a shown in FIG. 3A(b). The drainage hose passage flange 110 has an opening diameter corresponding to the outer diameter of the drainage hose 250 described above. A lid member 120 larger than the outer diameter of the drainage hose passage flange 110 is detachably provided on the front plate 300 of the watertight door 100a. The lid member 120 closes the drain hose passage flange 110 portion by screwing screws (not shown) into a plurality of screw holes 310 provided on the outer periphery.

As shown in FIG. 3B(a), when the watertight door 100a is viewed from the river 210 side, the lid member 120 is attached to the drainage hose passage flange 110 from the river 210 side. The lid member 120 receives water pressure from the river 210 side with the front plate 300, and prevents the lid member 120 from coming off due to the water pressure from the river 210.

As shown in FIG. 3B(b), FIG. 3A(b), and FIG. 3B(a), arc-shaped guide hardware 312 is attached to the side plates 302 on both sides. The guide hardware 312 functions as a guide member when the watertight door 100a moves up and down during installation and removal of the watertight door 100a in the door groove 151 portion of the water discharge gate 150.

FIG. 4 is a partially enlarged plan view of the corner cut gate according to the embodiment, and FIG. 5 is a partially enlarged side view of the corner cut gate according to the embodiment. An enlarged view of the lowermost watertight door 100d among the corner drop gates 100 installed in the door groove 151 portion is shown.

As shown in FIG. 4, the above-mentioned guide hardware 312 is provided on both sides of the front plate of all the watertight doors 100a to 100d, including the bottom watertight door 100d, and the watertight door is installed in the door groove 151. When installing the watertight door 100d by moving it from the top, if each of the watertight doors 100a to 100d moves in the width direction due to swinging or the like, the guide hardware 312 on both sides of each of the watertight doors 100a to 100d comes into contact with the door groove 151.

At this time, since the guide hardware 312 protrudes in an arc shape, it comes into contact with the door groove 151 like a point contact, reducing the contact area. Thereby, when installing the watertight doors 100a to 100d, the side plate 302 does not directly touch the door groove 151, making it possible to smoothly perform the installation work.

Further, in the watertight rubber 400 described above, the convex portion 400a that protrudes by a predetermined amount from the side of each of the watertight doors 100a to 100d is in contact with the door groove 151, and the watertight rubber 400 has a convex portion 400a that protrudes by a predetermined amount from the side of each of the watertight doors 100a to 100d. Each door groove 151 is waterproofed in the height direction.

Further, as shown in FIGS. 4 and 5, engagement pieces 401 are formed protruding from both sides of the front plate of the lowermost watertight door 100d, and engagement pieces 401 of the watertight door 100d are formed at the bottom of the door groove 151. An engagement piece 151b that engages with 401 is formed to protrude.

The engagement piece 151b on the door groove 151 side is formed to be inclined so as to protrude from the upper part to the lower part towards the watertight door 100d side. On the other hand, the engagement piece 401 on the watertight door 100d side is formed to be inclined so as to retract toward the watertight door 100d from the top to the bottom. As a result, when the watertight door 100d is moved from above and installed in the door groove 151 portion, the engagement piece 401 of the watertight door 100d engages with the engagement piece 151b of the door groove 151 like a wedge, and inside the door groove 151. With this, the position of the watertight door 100d can be maintained in a positioned state in the direction of the door stop reference line R.

In the illustrated example, the engagement pieces 151b and 401 are provided corresponding to the installation position of the lowest watertight door 100d, but for example, the engagement pieces 151b and 401 are provided corresponding to the installation position of the lowest watertight door 100d. Similarly, a pair of engagement pieces can be provided in the groove 151 as well. At this time, the pair of engagement pieces provided at the top level may be provided at a width position shifted by a predetermined amount from the position (width position) of the pair of engagement pieces 151b, 401 provided at the bottom level.

Further, as shown in FIG. 5, a fixing metal fitting 501 such as an angle plate is provided at the lower part of the bottom plate 303 only in the lowermost watertight door 100d installed in the door groove 151 portion. On the other hand, a fixing metal fitting 502 is provided at the bottom of the door groove 151 at a position opposite to the fixing metal fitting 501, and these fixing metal fittings 501, 502 are fixed with bolts 503. Thereby, the lowermost watertight door 100d and the other watertight doors 100c, 100b, and 100a stacked on this watertight door 100d can all be fixedly held.

FIG. 6 is a front view showing another configuration example of the watertight door according to the embodiment. Another configuration example of the drainage hose passage flange 110 provided on the uppermost watertight door 100a is shown. A plurality of drainage hose passage flanges 110 may be provided across the width direction of the watertight door 101a installed at the top. In the example of FIG. 6, three drainage hose passage flanges 110 are provided in the width direction. In this case, each drainage hose passage flange 110 is provided with a lid member 120 that is detachable.

By providing a plurality of drainage hose passage flanges 110, the drainage hose 250 can be provided at any part of the drainage hose passage flange 110. The drainage hose passage flanges 110 are provided at different positions in the width direction of the watertight door 101a, and only one drainage hose passage flange 110 suitable for the work condition of the drainage work can be used. In this case, the other two drainage hose passage flanges 110 may be closed with the lid member 120.

In addition, when draining the accumulated water in the waterway 200 to the river 210 side quickly, the drainage hoses 250 are passed through the drainage hose passing flanges 110 at multiple locations depending on the amount of drainage, and the water is drained simultaneously using the plurality of drainage hoses 250. By doing so, the drainage work can be completed in a short time.

FIG. 7 is a diagram illustrating water cutoff work for the entire waterway including the corner drop gate according to the embodiment. The above-mentioned waterway 200 is located at the most downstream position in the figure. An example of a procedure for water cutoff work during inspection work on a waterway downstream of a dam will be explained using FIG. 7. For each component in the figure, an example of EL at each location is described.

A water conduit 703 is provided between the water intake port 702 of the dam 701 and the surge tank 704. A water intake gate 712 is provided at the water intake 702 . A penstock 705 is provided between the surge tank 704 and the power plant 706. For example, the distance from dam 701 to power plant 706 is 19 km. Reference numeral 716 is a water turbine 716 of the power plant 706. A Howellbanger valve 720 is installed between the upstream and downstream sides of the power plant 706.

The above-described waterway 200 is arranged downstream of the power plant 706 via a waterway garden 707 . A water garden gate 717 is provided in the water garden 707. The water discharge channel 200 is provided with the water discharge gate 150 described above, and the corner drop gate 100 is installed in the water discharge gate 150.

Each section of the headrace 703, the penstock 705, and the waterway from the waterway 707 to the waterway 200 is subjected to a periodic inspection, for example, once every three years, with the water cut off and an internal inspection performed. The procedure for water outage at this time will be explained below.

The EL conversion value of the iron pipe water pressure gauge was determined by the water pressure gauge reading kg/cm ² ×10+14.57. Moreover, the top end of the water intake port 702 is 21.7 kg/cm ² ×10+14.57 m=231.570≈EL231.010. Further, the port height of the surge tank 704 is 18.9 kg/cm ² ×10+14.57 m=203.570≈EL204.000. Moreover, the iron pipe spout lining is 18.2 kg/cm ² ×10+14.57 m=196.570≈EL196.300.

1. Water cutoff in the headrace 703 After the water intake gate 712 of the headrace 703 is fully closed, the water turbine generator in the headrace 703 starts a no-load operation of 1.8 m ³ /s (at this time, 6 min operation, 17 min operation) (repeatedly stopping operation).
Then, confirm that the top of the water intake port 702 is below EL231.01 m (21.7 kg/cm ² as measured by the iron pipe water pressure gauge).
2. After this, 3M (2.9 m ³ /s) load operation is started.
Then, confirm that the water intake gate floor has an EL of 227.80 m or less (iron pipe water pressure gauge: 21.3 kg/cm ² ).

3. 1st day of water outage in headrace channel 703 completed 4. Start of work on the second day of water outage in headrace channel 703 Confirm that the port height of surge tank 704 is below EL204.00m (iron pipe water pressure gauge: 18.9kg/cm ² ).
5. Start no-load operation at 1.8 m ³ /s.
Then, confirm that the iron pipe spout has an EL of 196.30 m or less (iron pipe water pressure gauge: 18.2 kg/cm ² ).
6. This completes the water cutoff of the water conduit 703.

7. Water cutoff of penstock 705 begins 8. Fully open the iron pipe drain valve.
Then, it is confirmed that the iron pipe water pressure gauge is 0.0 kg/cm ² , and the water cutoff of the penstock iron pipe 705 is completed.

9. Start of water outage in the water garden 707 A water garden gate 717 is installed in the water garden 707, a drainage pump is operated, and water in the water garden 707 is discharged into the water discharge channel 200.
10. Water cutoff of water garden 707 completed

11. Start of water cutoff in the spillway 200 As described above, after installing the corner drop gate 100 in the water discharge gate 150 portion of the spillway 200, the submersible pump is operated to drain the water in the spillway 200 to the river 210 via the drainage hose 250. Drain to.
12. Water cutoff of waterway 200 completed

The time required for each of the above-mentioned tasks is, for example, 1. ~2. 70 minutes of work; 2. ~5. 13 hours of work, 5. ~6. 4 hours of work, 7. ~8. 80 minutes of work, 9. ~10. 90 minutes of work, 11. ~12. The work required is 11 hours.

In the corner drop gate of the embodiment described above, by forming a plurality of watertight doors from steel, the watertight doors form a wall surface in close contact with each other due to the weight of each watertight door when installed in the water discharge gate. , it is possible to reliably prevent water from entering the drainage channel by simply installing it in the same manner as the conventional corner drop installation work, and with a simple configuration.

Moreover, the drainage hose can be reliably and stably supported by a simple structure in which the drainage hose is simply passed through the drainage hose passage flange formed on the watertight door. In addition, by providing a drainage hose passage flange only on the watertight door installed at the top level, the drainage hose can be reliably positioned above the water surface without interfering with drainage by the submersible pump. It is possible to reliably prevent water from entering the waterway from the boundary between the peripheral edge and the outer peripheral surface of the drain hose.

Thereby, the safety of workers working in the waterway can be ensured with a simple configuration. Furthermore, since there is no major change compared to conventional drainage work, it is possible to reduce the burden on the worker who performs the drainage work.

Further, it is possible to reliably prevent water from entering the waterway from the boundary between the inner circumferential edge of the drain hose passage flange and the outer circumferential surface of the drain hose. In addition, the simple configuration allows the drain hose to be reliably kept away from the water surface, making it possible to reliably prevent water from entering the waterway from the boundary between the inner circumferential edge of the drain hose passage flange and the outer circumferential surface of the drain hose. . In addition, by blocking the drain hose passage flange with a lid member after removing the submersible pump, even if it is not possible to immediately remove the drain hose, in addition to water intrusion into the waterway, small animals and foreign objects may enter the waterway. It is possible to reliably prevent the intrusion of

In addition, the watertight door installed at the top level is equipped with multiple flanges for passage of drainage hoses, and each flange for passage of drainage hoses is closed with a lid member, so that, for example, The drain hose can be routed to any drainage hose passage flange at any location, allowing the operator to select and use any drainage hose passage flange according to the work situation. will be able to secure Further, the amount of drainage can be increased by passing the drainage hose through each of the plurality of drainage hose passage flanges, and in this case, the delivery can be completed in a short time.

As described above, the present invention can be applied to technology that is installed at the boundary of a waterway and drains the waterway downstream, and is particularly useful for a corner drop gate that is temporarily installed in a waterway downstream of a dam.

100 Corner drop gate 100a to 100d Watertight door 110 Drainage hose passage flange 120 Lid member 150 Water discharge gate 151 Door groove 152 Working hole 152a Lid 200 Discharge channel 210 River 250 Drainage hose 300 Front plate 301 Top plate 302 Side plate 303 Bottom plate 31 2 Guide hardware 400 Watertight rubber 701 Dam 702 Water intake 703 Headrace 704 Surge tank 705 Penstock 706 Power plant 707 Water garden 712 Water intake gate 716 Water wheel 717 Water garden gate R Household reference line

Claims (9)

A corner drop gate installed at the water discharge gate at the boundary between the waterway and the river,
Consisting of a plurality of watertight doors made of steel and stacked in the door groove of the water discharge gate,
a drainage hose passage flange that is opened near the upper end of the watertight door at the top level and allows a drainage hose to pass therethrough for draining water in the waterway into the river;
a lid member that is removably attached to the drainage hose passage flange;
Equipped with
Among the plurality of watertight doors, the lowermost watertight door is provided with a fixing metal fitting on the bottom surface thereof, and can be fixed to a fixing metal fitting provided on the bottom surface of the door groove. A corner drop gate installed at the water discharge gate at the boundary between the waterway and the river,
Consisting of a plurality of watertight doors made of steel and stacked in the door groove of the water discharge gate,
a drainage hose passage flange that is opened near the upper end of the watertight door at the top stage and allows a drainage hose to pass therethrough for draining water in the waterway into the river;
a lid member that is removably attached to the drainage hose passage flange;
Equipped with
The corner drop gate is characterized in that the inner diameter of the inner circumferential edge of the drain hose passage flange is equal to the outer diameter of the outer circumferential surface of the drain hose. The lid member is removed at the time of draining water by passing the drain hose through the drain hose passage flange,
The corner drop gate according to claim 1 or 2, wherein the corner drop gate is attached to the drainage hose passage flange after the drainage or when the river water increases. Each of the plurality of watertight doors is provided with a locking piece on the top plate for suspension during installation,
A locking hole into which the locking piece fits is provided in the lower plate,
In a state in which a plurality of the watertight doors are stacked in the door groove, the locking piece of the watertight door located at the bottom engages with the locking hole of the watertight door located at the top and is positioned. The corner drop gate according to any one of claims 1 to 3, characterized by: When a plurality of the watertight doors are stacked in the door groove, the locking piece of the watertight door located at the bottom is engaged with the locking hole of the watertight door located at the top using a fixture. The corner drop gate according to claim 4, wherein the corner drop gate is fixable. The corner drop gate according to any one of claims 1 to 5, wherein the lid member is detachable from the watertight door on the side that receives water pressure on the river side. The corner drop gate according to any one of claims 1 to 6, characterized in that guide hardware is attached to the side portions of the plurality of watertight doors to reduce contact with the door grooves. The corner drop gate according to any one of claims 1 to 7, characterized in that watertight rubber is provided on the top and side surfaces of the plurality of watertight doors to shut off water at each location. Of the plurality of watertight doors, at least the bottom watertight door has an engaging piece protrudingly formed thereon;
An engagement piece that engages with the engagement piece in a wedge shape is formed protruding from the door groove in correspondence with the position of the engagement piece of the watertight door at the bottom level, and the engagement piece engages with the engagement piece in a wedge shape. The corner drop gate according to any one of claims 1 to 8, characterized in that the corner drop gate is held in a positioned state.

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