Flat pressure regulating structure for rapid emptying of high dam reservoir

Abstract

The application discloses a kind of high dam reservoir rapid emptying flat pressure regulating structure, including water retaining gate well, emptying gate chamber and regulating pool, water retaining gate well, emptying gate chamber are set in tunnel, tunnel is communicated with reservoir, and the arrangement order of water retaining gate well, emptying gate chamber is same with the water flow direction in tunnel, the quantity of water retaining gate well, regulating pool is n, wherein, along the arrangement order of water retaining gate well on tunnel, the i th water retaining gate well is communicated with the i th regulating pool by water replenishing pipe, the i th regulating pool is communicated with the i+1 th regulating pool by inter-stage overflow gallery, the setting elevation of the i th regulating pool is greater than the setting elevation of the i+1 th regulating pool, last regulating pool is communicated with the downstream tunnel of emptying gate chamber by final-stage overflow gallery, n, i are all positive integers.The technical scheme of the application guarantees the water pressure in gate well to quickly return to stable under the condition of gate leakage, reduces the frequency of valve operation, realizes the stability of gate water-retaining maintenance operation condition.

Description

Technical Field

[0001] This invention belongs to the field of water conservancy and hydropower engineering technology, specifically relating to a pressure regulating structure for rapid emptying of high dam reservoirs. Background Technology

[0002] The safe emptying of high dams and large reservoirs is a key challenge in hydropower projects. Currently, a system has emerged that utilizes multi-stage gates to distribute the total head, enabling the emptying of high dams and large reservoirs to any depth. In the prior art, patent document CN109469025B discloses an overflow gallery system for a high dam's tiered water-retaining and emptying system. This system includes a primary overflow gallery and a final overflow gallery. The high dam's tiered water-retaining and emptying system is installed within the river channel. This system comprises n primary gate devices, secondary gate devices, and discharge gate devices arranged sequentially along the river's flow direction. The primary gate devices include parallel maintenance gate wells and working gate wells. The secondary gate devices include emergency gate wells. The primary overflow gallery connects adjacent primary gate devices, and the final overflow gallery connects the river channels before and after the discharge gate device. This patented technology reduces the water head step by step through various gate devices and discharges excess water in a timely manner through various overflow channels, avoiding excessive water pressure on the gate devices at each level, protecting the devices and facilities in the high dam's step-by-step water blocking and emptying system, and ensuring the safe and stable operation of the system.

[0003] However, the above-mentioned patented technology still has the following shortcomings: there are too many valves in the system, making operation and maintenance difficult. In addition, the valves open and close frequently during the pressure equalization process, making them prone to accidents and difficult to manage. The failure of the pressure equalization pipe system can easily lead to poor pressure equalization and water filling of the entire structure, endangering safety. At the same time, the overflow channel is complicated, and there are pressurized and unpressurized flows and complex flow patterns, which pose serious hydraulic safety problems. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides a pressure regulating structure for rapid emptying of high dam reservoirs.

[0005] The present invention is achieved through the following technical solution.

[0006] This invention provides a pressure regulating structure for rapid emptying of a high dam reservoir, comprising a water-retaining gate well, an emptying gate chamber, and a regulating pool. The water-retaining gate well and the emptying gate chamber are located on a tunnel connected to the reservoir, and the arrangement order of the water-retaining gate well and the emptying gate chamber is the same as the water flow direction within the tunnel. The number of water-retaining gate wells and regulating pools is [missing information]. There are 1, wherein, in the order of arrangement of the water-retaining gate wells on the tunnel, the 1st The first water-retaining gate well and the first The first regulating tank is connected by a water supply pipe. The first regulating tank and the first The regulating tanks are connected by inter-stage overflow corridors. The elevation of the first regulating pool is greater than that of the second. The elevation of each regulating pool is specified, and the last regulating pool is connected to the downstream tunnel of the discharge gate chamber via a final-stage overflow corridor. , All are positive integers.

[0007] The final overflow channel includes a low-speed overflow section and a high-speed overflow section. Following the arrangement of the water-retaining gate wells on the tunnel, the downstream tunnel of the emptying gate chamber is used as the pressureless section. The low-speed overflow section is connected between the last regulating pool and one end of the high-speed overflow section, and the other end of the high-speed overflow section is connected to the pressureless section.

[0008] The pressure regulation structure for rapid emptying of the high dam reservoir also includes a water filling pipe. Along the arrangement sequence of the water-retaining gates on the tunnel, the upstream tunnel of the last water-retaining gate is taken as the first pressurized section, and the tunnel between the last water-retaining gate and the emptying gate chamber is taken as the second pressurized section. The water filling pipe is connected to the second pressurized section and communicates with the low-speed overflow section.

[0009] The slope of the low-speed overflow section relative to the horizontal plane is 3%.

[0010] The high-speed overflow section is arranged in a vertical direction.

[0011] There are two regulating pools, with the first regulating pool set at an elevation of 2856m and the last regulating pool set at an elevation of 2817m.

[0012] The tunnel is also equipped with an emergency gate well, which is located between the drain gate chamber and the last water-blocking gate well. The water supply pipe is also connected between the emergency gate well and the last regulating pool.

[0013] The tunnel is also equipped with a pressure-reducing shaft, which is located between the emergency gate well and the last water-blocking gate well. The water supply pipe is also connected between the pressure-reducing shaft and the last regulating pool. A vent is also provided inside the pressure-reducing shaft.

[0014] The water-blocking gate well is equipped with a water-blocking gate. The water-blocking gate is flat in shape and can slide up and down in the water-blocking gate well in the vertical direction.

[0015] The venting chamber is equipped with a venting gate, which is a fan-shaped structure and can rotate within the venting chamber.

[0016] The beneficial effects of this invention are as follows: By arranging regulating pools near the gate of the high dam reservoir's emptying tunnel, the water pressure in the gate well is ensured to quickly return to stability under gate leakage conditions, reducing the frequency of valve operation, improving the problem of excessively rapid water level drop in the vertical shaft, and achieving stable operation of the gate during water blocking and maintenance. Compared with the prior art, the water head is gradually reduced through regulating pools at each level, and excess water flow is discharged in a timely manner through regulating pools at each level, avoiding excessive water pressure on the gates at each level, protecting the devices and facilities in the high dam reservoir's emptying system, ensuring the safe and stable operation of the system, and eliminating numerous control valves, simplifying the structure, and improving the ease of operation. Attached Figure Description

[0017] Figure 1 This is a top view of the present invention;

[0018] Figure 2 This is the front view of the present invention.

[0019] In the diagram: 1-Water-retaining gate well, 2-Drainage gate chamber, 3-Regulating pool, 4-Tunnel, 5-Water supply pipe, 6-Interstage overflow corridor, 7-Final stage overflow corridor, 8-Low-speed overflow section, 9-High-speed overflow section, 10-Unpressurized section, 11-First pressurized section, 12-Second pressurized section, 13-Water filling pipe, 14-Emergency gate well, 15-Pressure shaft, 16-Ventilation hole, 17-Drainage gate. Detailed Implementation

[0020] The technical solution of the present invention will be further described below with reference to the accompanying drawings, but the scope of protection is not limited to the description.

[0021] like Figures 1 to 2 As shown, this invention provides a pressure regulating structure for rapid emptying of a high dam reservoir, including a water-retaining gate well 1, an emptying gate chamber 2, and a regulating pool 3. The water-retaining gate well 1 and the emptying gate chamber 2 are located on a tunnel 4, which is connected to the reservoir. The arrangement order of the water-retaining gate well 1 and the emptying gate chamber 2 is the same as the water flow direction in the tunnel 4. The number of water-retaining gate wells 1 and regulating pools 3 is [missing information]. There are 1, among which, following the arrangement order of the water-retaining gate well 1 on tunnel 4, the 1st The first and second water-retaining gate well The regulating tank 3 is connected by a water supply pipe 5. The third regulating tank and the first The regulating tanks 3 are connected by inter-stage overflow corridors 6. The elevation of regulating pool 3 is greater than that of the first regulating pool. The elevation of each regulating pool 3 is set, and the last regulating pool 3 is connected to the downstream tunnel 4 of the discharge gate chamber 2 through the final overflow corridor 7. , All are positive integers.

[0022] By employing the technical solution of this invention, a regulating pool is arranged near the gate of the high dam reservoir's venting tunnel, ensuring that the water pressure in the gate well quickly returns to stability under gate leakage conditions. This reduces the frequency of valve operation, improves the problem of excessively rapid water level drop in the vertical shaft, and achieves stable operation of the gate during water blocking and maintenance. Compared with existing technologies, the water head is gradually reduced through regulating pools at each level, and excess water flow is discharged in a timely manner through these pools, preventing excessive water pressure on each gate. This protects the devices and facilities within the high dam reservoir's venting system, ensures the safe and stable operation of the system, and eliminates numerous control valves, simplifying the structure and improving ease of operation.

[0023] Specifically, the final overflow channel 7 includes a low-speed overflow section 8 and a high-speed overflow section 9. Following the arrangement of the water-retaining gate wells 1 on the tunnel 4, the downstream tunnel 4 of the empty gate chamber 2 is used as the pressureless section 10. The low-speed overflow section 8 is connected between the last regulating pool 3 and one end of the high-speed overflow section 9, and the other end of the high-speed overflow section 9 is connected to the pressureless section 10.

[0024] In addition, the pressure regulating structure for rapid emptying of the high dam reservoir also includes a water filling pipe 13. Following the arrangement of the retaining gates 1 on the tunnel 4, the upstream tunnel 4 of the last retaining gate 1 is designated as the first pressurized section 11, and the tunnel 4 between the last retaining gate 1 and the emptying gate chamber 2 is designated as the second pressurized section 12. The water filling pipe 13 connects the second pressurized section 12 to the low-speed overflow section 8. Preferably, the slope of the low-speed overflow section 8 relative to the horizontal plane is 3%. The high-speed overflow section 9 is arranged vertically. There are two regulating pools 3, with the first regulating pool 3 set at an elevation of 2856m and the last regulating pool 3 set at an elevation of 2817m.

[0025] In addition, an emergency gate shaft 14 is provided on tunnel 4. The emergency gate shaft 14 is located between the venting gate chamber 2 and the last water-retaining gate shaft 1. The water supply pipe 5 is also connected between the emergency gate shaft 14 and the last regulating pool 3. An emergency gate is provided inside the emergency gate shaft 14. The emergency gate is flat in shape and can slide vertically up and down within the emergency gate shaft 14. A pressure-regulating shaft 15 is also provided on tunnel 4. The pressure-regulating shaft 15 is located between the emergency gate shaft 14 and the last water-retaining gate shaft 1. The water supply pipe 5 is also connected between the pressure-regulating shaft 15 and the last regulating pool 3. A vent 16 is also provided inside the pressure-regulating shaft 15. A water-retaining gate is provided inside the water-retaining gate shaft 1. The water-retaining gate is flat in shape and can slide vertically up and down within the water-retaining gate shaft 1. The venting chamber 2 is equipped with a venting gate 17, which is a fan-shaped structure and can rotate within the venting chamber 2.

Claims

1. A pressure regulating structure for rapid emptying of water from a high dam reservoir, characterized in that: The system includes a water-retaining gate well (1), a drain gate chamber (2), and a regulating pool (3). The water-retaining gate well (1) and the drain gate chamber (2) are located on a tunnel (4), which is connected to a reservoir. The arrangement of the water-retaining gate well (1) and the drain gate chamber (2) is in the same order as the water flow direction in the tunnel (4). The number of water-retaining gate wells (1) and regulating pools (3) is [number missing]. One, wherein, along the arrangement order of the water-retaining gate wells (1) on the tunnel (4), the first The first water-retaining gate well (1) and the first The regulating tank (3) is connected by a water supply pipe (5), and the first... The regulating pool (3) and the first The regulating tanks (3) are connected by inter-stage overflow corridors (6), and the first... The elevation of the regulating pool (3) is greater than that of the first regulating pool. The elevation of each regulating pool (3) is set, and the last regulating pool (3) is connected to the downstream tunnel (4) of the discharge gate chamber (2) through the final overflow corridor (7). , All are positive integers.

2. The pressure regulating structure for rapid emptying of a high dam reservoir as described in claim 1, characterized in that: The final overflow channel (7) includes a low-speed overflow section (8) and a high-speed overflow section (9). Following the arrangement of the water-blocking gate well (1) on the tunnel (4), the downstream tunnel (4) of the empty gate chamber (2) is used as the pressureless section (10). The low-speed overflow section (8) is connected between the last regulating pool (3) and one end of the high-speed overflow section (9), and the other end of the high-speed overflow section (9) is connected to the pressureless section (10).

3. The pressure regulating structure for rapid emptying of a high dam reservoir as described in claim 2, characterized in that: The pressure regulation structure for rapid emptying of the high dam reservoir also includes a water filling pipe (13). Along the arrangement of the water-retaining gate wells (1) on the tunnel (4), the upstream tunnel (4) of the last water-retaining gate well (1) is taken as the first pressurized section (11), and the tunnel (4) between the last water-retaining gate well (1) and the emptying gate chamber (2) is taken as the second pressurized section (12). The water filling pipe (13) is connected to the second pressurized section (12) and communicates with the low-speed overflow section (8).

4. A pressure regulating structure for rapid emptying of a high dam reservoir as described in claim 2 or 3, characterized in that: The slope of the low-speed overflow section (8) relative to the horizontal plane is 3%.

5. The pressure regulating structure for rapid emptying of a high dam reservoir as described in claim 2, characterized in that: The high-speed overflow section (9) is arranged in a vertical direction.

6. The pressure regulating structure for rapid emptying of a high dam reservoir as described in claim 1, characterized in that: There are two regulating pools (3). The first regulating pool (3) is set at an elevation of 2856m, and the last regulating pool (3) is set at an elevation of 2817m.

7. The pressure regulating structure for rapid emptying of a high dam reservoir as described in claim 1, characterized in that: The tunnel (4) is also equipped with an emergency gate well (14), which is located between the drain gate chamber (2) and the last water-blocking gate well (1). The water supply pipe (5) is also connected between the emergency gate well (14) and the last regulating pool (3).

8. The pressure regulating structure for rapid emptying of a high dam reservoir as described in claim 7, characterized in that: The tunnel (4) is also equipped with a pressure shaft (15), which is located between the accident gate (14) and the last water-blocking gate (1). The water supply pipe (5) is also connected between the pressure shaft (15) and the last regulating pool (3). The pressure shaft (15) is also equipped with a ventilation hole (16).

9. A pressure regulating structure for rapid emptying of a high dam reservoir as described in claim 1, 7, or 8, characterized in that: The water-blocking gate well (1) is equipped with a water-blocking gate. The water-blocking gate is flat in shape and can slide up and down in the water-blocking gate well (1) in the vertical direction.

10. A pressure regulating structure for rapid emptying of a high dam reservoir as described in claim 1 or 6, characterized in that: The venting chamber (2) is equipped with a venting gate (17), which is a fan-shaped column and can rotate within the venting chamber (2).

Images