CN210315444U

CN210315444U - Water leakage collecting well suitable for underground powerhouse of pumped storage power station

Info

Publication number: CN210315444U
Application number: CN201920563301.3U
Authority: CN
Inventors: 舒崚峰; 李成军; 杨经卿
Original assignee: PowerChina Huadong Engineering Corp Ltd
Current assignee: PowerChina Huadong Engineering Corp Ltd
Priority date: 2019-04-24
Filing date: 2019-04-24
Publication date: 2020-04-14
Anticipated expiration: 2029-04-24

Abstract

The utility model discloses a water leakage collecting well suitable for underground powerhouse of pumped storage power station, the collecting well includes a water leakage collecting well body, a drainage gallery and a drainage main pipe, the water leakage collecting well body is divided into a left chamber and a right chamber by a water collection well isolation wall positioned in the middle of the water leakage collecting well body, two overflow holes are arranged on the water collection well isolation wall, and an explosion-proof sheet device is arranged in the overflow holes; the drainage main pipe is divided into two drainage branch pipes which are respectively connected to the left cavity and the right cavity of the seepage water collecting well body, and the drainage branch pipes are provided with gate valves; the drainage gallery is communicated with the seepage water collecting well body and is arranged on the side wall opposite to the drainage main pipe, and the drainage gallery comprises a confluence drainage ditch, a desilting pool and an outflow drainage ditch. The seepage sump pit can realize complete desilting and can eliminate potential safety hazards caused by short-time large-flow water seepage working conditions possibly occurring during desilting.

Description

Water leakage collecting well suitable for underground powerhouse of pumped storage power station

Technical Field

The utility model relates to a pumped storage power station engineering technical field, concretely relates to realize thoroughly cleaing away pumped storage power station underground factory building percolating water sump pit of seepage sump pit siltation silt.

Background

Pumped storage power stations generally take the form of underground plants. The underground powerhouse is positioned in the underground mountain body, and a large amount of water seepage can be generated in surrounding rock cracks after excavation is finished. In addition, the pumped storage unit and the auxiliary system equipment thereof can generate certain water leakage in the operation process, such as a water pump sealed by a packing. The two parts of water leakage can finally enter the factory building.

In order to ensure the safety of the underground plant and the normal operation of the units, the pumped storage power station is provided with a leakage drainage system, and the collected leakage water is discharged outside the plant through a deep well pump. Because the operation of the deep-well pump has the requirement of the lowest submerging depth, the lowest operation water level exists in the water collecting well, water below the water level cannot be discharged out of a plant by the deep-well pump, and the volume of the water collecting well below the water level is dead volume. Considering that the seepage water of the surrounding rock generally contains a certain amount of silt, the silt can enter the seepage water collecting well along with the water flow, and due to the existence of dead volume, the silt entering the water collecting well can be finally deposited at the bottom of the water collecting well. For this reason, seepage drainage systems are typically provided with a submersible sewage pump and piping system for removing the silt entering the sump. However, the submersible sewage pump is mainly used for discharging silt in a suspended state, and for the silt deposited at the bottom, the silt can be completely desilted only by discharging the water body in the dead volume of the water collecting well. However, for most underground powerhouse pumped-storage power plants, the accumulation of silt in the sump is a long process. From the economic aspect, a temporary submersible sewage pump and a temporary sewage hose with small capacity are generally adopted, namely the rated flow of the sewage pump is generally far smaller than the amount of leaked water which flows into a water collecting well. So that the dead volume cannot be completely emptied with the temporary submersible sewage pump. If according to the general underground factory building water leakage volume, select suitable permanent large-scale submersible sewage pump, because power is big, need supporting high-voltage motor to cause the condition that the cost is expensive, the frequency of use is low, and the pipe diameter of assorted permanent outlet conduit is big, thereby occupies finite space in the factory building, causes the factory building too crowded.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a percolating water sump pit structure of underground factory building of pumped storage power station to solve the problem that proposes in the above-mentioned background art.

In order to achieve the above purpose, the utility model provides a technical scheme as follows:

a water leakage collecting well suitable for underground powerhouses of pumped storage power stations is characterized in that the collecting well is located below a pump room, a deep well drainage pump is placed in the pump room, the collecting well comprises a water leakage collecting well body, a drainage gallery and a drainage main pipe, the water leakage collecting well body is divided into a left cavity and a right cavity by a collecting well partition wall located in the middle of the water leakage collecting well body, two overflow holes are formed in the water collection well partition wall, and an explosion-proof sheet device is installed in each overflow hole; the drainage main pipe is divided into two drainage branch pipes which are respectively connected to the left cavity and the right cavity of the seepage water collecting well body, and the drainage branch pipes are provided with gate valves; drainage gallery and seepage sump well body intercommunication, and set up on the side wall relative with the drainage house steward, it includes the escape canal that converges, the desilting pond and the escape canal that outflows, the escape canal that converges and the escape canal that outflows are located the upstream and downstream in desilting pond respectively, and converge the escape canal and have two respectively with the escape canal that outflows, all arrange in the inside both sides of drainage gallery, two all install the flashboard on the escape canal that outflows, and two exports of the escape canal that outflows correspond to two cavities about the seepage sump well body respectively, the desilting pond has erect the passerby passageway.

Preferably, the gate valve is a long-handle gate valve.

Preferably, the bottom surface of the outflow drain is lower than the bottom surface of the confluence drain.

Preferably, the overflow hole is square.

The utility model has the advantages that:

the utility model relates to a succinct, with low costs, equipment is simple, convenient operation, factor of safety is high, at first slows down the siltation of sump pit silt through the drainage corridor, secondly through becoming two cavities with the sump pit body interval, can realize the complete desilting of the seepage sump pit of underground factory building formula pumped storage power station to can eliminate the potential safety hazard that the large-traffic infiltration operating mode brought in short time that probably takes place during the desilting.

Drawings

FIG. 1 is an overall structure diagram of the present invention;

FIG. 2 is an internal structure view of the present invention;

FIG. 3 is a view showing the structure of the drainage gallery of the present invention;

in the figure: 1-pump house, 2-drainage deep well pump, 3-drainage header pipe, 4-hanging hole, 5-collector well partition wall, 6-drainage gallery, 7-seepage collector well body, 8-square overflow hole, 9-submersible sewage pump pit, 10-gate valve, 11-flashboard, 12-outflow drainage ditch, 13-desilting basin, 14-confluence drainage ditch and 15-passerby passage.

Detailed Description

The technical solution and advantages of the present invention will be further explained in detail with reference to the accompanying drawings.

As shown in fig. 1-3, the utility model discloses a percolating water sump pit suitable for pumped storage power station underground factory building is located the below of pump house 1, places drainage deep-well pump 2 in the pump house 1, and this sump pit includes seepage sump pit body 7, drainage corridor 6 and drainage house steward 3, and this seepage sump pit body 7 is divided into it through the sump pit partition wall 5 that is located its middle part and is controlled two cavities, has two square overflow holes 8 on the sump pit partition wall 5, installs explosion-proof piece device in the square overflow hole 8. The drainage main pipe 3 is divided into two drainage branch pipes which are respectively connected to the left chamber and the right chamber of the seepage collecting well body 7, and the drainage branch pipes are provided with gate valves 10. Drainage gallery 6 communicates with seepage sump well body 7, and set up on the lateral wall relative with drainage header 3, it includes conflux escape canal 14, desilting pond 13 and the escape canal 12 of effluenting, conflux escape canal 14 and the last low reaches that escape canal 12 lies in desilting pond 13 respectively of effluenting, and conflux escape canal 14 and the escape canal 12 of effluenting have two respectively, all arrange in the inside both sides of drainage gallery 6, all install flashboard 11 on two escape canals 12 of effluenting, and two exports of effluenting escape canal 12 are corresponding to two chambeies about seepage sump well body 7 respectively. A people passage 15 is erected on the desilting basin 13.

Under the normal condition, factory building equipment leaks and collects two cavities of sump pit body 7 through main drain 3, the surrounding rock crack infiltration gets into desilting pond 13 through drainage corridor 6's drainage ditch 14 that converges, wait that desilting pond 13 is full of the back and flow into two cavities of sump pit body 7 through escape canal 12 that outflows, partial silt in the surrounding rock crack infiltration this moment has already settled in desilting pond 13, the silt volume in two cavities that have got into sump pit body 7 has been reduced, when the water in sump pit body 17 reaches the start-up water level of deep-well pump 2 of drainage, deep-well pump 2 of drainage starts, discharge the percolating water outside the factory building, when the water level descends to the stop pump water level, deep-well pump 2 of drainage stops working. The silt deposited in the desilting basin 13 can be manually removed at any time according to the needs.

And dredging the sub-chamber of the sump body 7. When the water level in the chamber required to be desilted is reduced to the pump stopping water level of the deep well drainage pump 2, the gate valve 10 on the drainage branch pipe corresponding to the chamber to be desilted and the flashboard 11 at the outlet of the corresponding confluence drainage ditch 14 are closed, the leakage water enters into the other chamber which does not need to be desilted, then the temporary dredge pump is lowered to the submersible dredge pump pit 9 in the chamber through the hanging hole 4, the sewage in the dead volume is emptied, and finally the sludge deposited at the bottom of the chamber is emptied. If the inflow of the seepage water is suddenly increased in the dredging process, the water level in the non-dredging chamber is quickly increased, and when the water level reaches the warning water level, the water level alarm device in the water collecting well body 7 alarms firstly. When the water level further improves to above 8 tops in square overflow hole and when surpassing the pressure-bearing scope of explosion-proof piece device, the explosion-proof piece breaks, and rivers get into the cavity of desilting through square overflow hole 8 to guarantee the safety of factory building. If there is an operator in the dredging chamber, the safe evacuation can be realized in the period from the time when the water level alarm signal is sent to the time when the explosion-proof sheet is broken.

For ease of operation, the gate valve 10 is a long handled gate valve.

To prevent seepage back of surrounding rock crevices in the drainage galleries, the floor of the outflow drain 12 is lower than the floor of the confluence drain 14.

Claims

1. The water leakage collecting well suitable for the underground powerhouse of the pumped storage power station is characterized in that the collecting well is positioned below a pump room (1), a deep well drainage pump (2) is arranged in the pump room (1), the collecting well comprises a water leakage collecting well body (7), a drainage gallery (6) and a drainage main pipe (3), the water leakage collecting well body (7) is divided into a left chamber and a right chamber by a collecting well partition wall (5) positioned in the middle of the water leakage collecting well body, two overflow holes (8) are formed in the collecting well partition wall (5), and an explosion-proof sheet device is installed in each overflow hole (8); the drainage main pipe (3) is divided into two drainage branch pipes which are respectively connected to a left cavity and a right cavity of the seepage water collecting well body (7), and the drainage branch pipes are provided with gate valves (10); drainage corridor (6) and seepage sump well body (7) intercommunication, and set up on the side wall relative with drainage house steward (3), it is including converging escape canal (14), desilting pond (13) and escape canal (12) of effluenting, it is located the upper and lower trip of desilting pond (13) respectively to converge escape canal (14) and escape canal (12) of effluenting, and it has two respectively to converge escape canal (14) and escape canal (12) of effluenting, all arrange in the inside both sides of drainage corridor (6), all install flashboard (11) on two escape canal (12) of effluenting, and two exports of effluenting escape canal (12) are corresponding to two chambeies of the left and right sides of seepage sump well body (7) respectively, built-up people's passageway (15) on desilting pond (13).

2. The percolating water collector well suitable for pumped storage power station underground powerhouse according to claim 1, characterized in that the gate valve (10) is a long-handled gate valve.

3. The percolating water collector well for pumped storage power station underground works according to claim 1, characterized in that the bottom of the outflow drain (12) is lower than the bottom of the confluence drain (14).

4. The percolating water collecting well for pumped storage power station underground works according to claim 1, characterized in that the overflow aperture (8) is square.