CN111705741A - Drainage and water refilling system, drainage method and refilling method of water cushion pond - Google Patents

Abstract

The invention relates to a water cushion pond maintenance drainage and water backfilling system, a drainage method and a water backfilling method. The purpose of the present invention is to provide a safe, reliable and practicable water-cushion pond maintenance, drainage and refilling system, drainage method and refilling method. The technical scheme of the present invention is as follows: the system is arranged in the Erdao Dam, and has: an artesian filling and draining pipe, which connects the upstream water cushion pond and the downstream river channel of the Erdaoba; a flow meter is installed on the artesian filling and draining pipe; a water collecting tank , set in the area where the bottom of the water cushion pond is connected to the Erdao dam; maintenance of the drainage pipeline, including maintenance of the water intake pipe, maintenance of the drainage main pipe I, maintenance of the drainage branch pipe and maintenance of the drainage main pipe II; backwash pipeline, including maintenance of the water intake pipe, maintenance and drainage Main pipe I and maintenance drainage main pipe II; pressure transmitter, installed in the maintenance and drainage main pipe I, used to monitor the water level of the sump in the water cushion pond; control and monitoring system, connected with the flow meter and pressure transmitter circuit. The invention is suitable for the field of water conservancy and hydropower engineering.

Description

Drainage and water refilling system, drainage method and refilling method of water cushion pond

technical field

The invention relates to a water cushion pond maintenance drainage and water backfilling system, a drainage method and a water backfilling method. Applicable to the field of water conservancy and hydropower engineering.

Background technique

The water cushion pond is an energy dissipation and anti-scour protection project behind the arch dam, which prevents the dam foundation from being eroded and damaged after the arch dam discharges water, and protects the safety and stability of the dam. Usually, the flood discharge operation of the arch dam, or the collapse of the bank slope during heavy rain may cause erosion damage to the water cushion pond. In order to ensure the safety of the dam, it is generally necessary to carry out pumping maintenance for the water cushion pond on a regular basis.

(1) At present, the water cushion ponds of Ertan, Laxiwa, Xiaowan and other large hydropower stations built in my country mostly use temporary pumping and drainage systems to pump and empty the water cushion ponds for maintenance.

Temporary pumping and drainage methods mainly have the following shortcomings: 1. The system construction workload is heavy, and the drainage system and assembly procedures are cumbersome; 2. The whole process of the system basically requires manual intervention, which cannot realize automatic control and monitoring, and is inconvenient to operate and maintain; 3. . The pumping system equipment is arranged outdoors, the drainage system has a high failure rate, low work efficiency, and long drainage time; 4. The temporary power supply and electromechanical equipment are exposed, which may bring safety hazards to the staff.

(2) The Chinese patent "Water Supply and Drainage System for Water Pad Pool" with the patent number of 201020554462.5 provides a solution for setting up a fixed pumping and drainage pump room in the second dam for the maintenance and use of the water supply pad pool. Its advantages are: the same as the previous solution. In contrast, the automatic control operation of filling and draining during the maintenance of the water cushion pond can be realized.

However, this solution also has many shortcomings, mainly as follows: 1. The suction pipes set before and after the water pump are lower than the bottom of the water cushion pond, and the drainage pipes are set below or close to the bottom of the river bed, because the system is only used when the water cushion pond is overhauled. It is necessary, usually not running, and in a static state for a long time, the pumping and draining pipelines naturally have siltation, which leads to blockage of the system, and it is difficult to clear the silt in the pipeline. It is also necessary to consider a certain backwashing function; 2. The pump system is only equipped with a control valve, and the function is not clear. In fact, after the water pressure before and after the water cushion pond is balanced, the pump needs to build pressure to meet the needs of the normal operation of the pump. Increase the pump control valve and pressure building valve to meet the needs of system operation; 3. The maintenance and drainage system of the water cushion pond is composed of multiple pump groups. The operation is comprehensively considered according to the water level in the water cushion pond, and the small amount of the bottom of the water cushion pond is not considered. 4. The slopes on both sides of the large water cushion pond are relatively high, and the second dam behind the water cushion pond should consider the influence of the valley width deformation. The valley width deformation will cause damage to the structure of the pump room and the drainage pipeline. 5. At the mouth of the intake and drainage pipes, there are both rolling stones generated by the upstream flood discharge, and debris such as woven bags that have not been cleaned upstream, as well as water supply pumps, valves and drainage pipelines. Safe operation causes great potential safety hazards. The solutions to these factors are not reflected in this patent. Filtering equipment needs to be set up. 6. The water level range of the actual application of the filling and draining pipeline system is not considered, and the high-speed water flow is not considered. 7. Corresponding measures should also be considered in the water body for plugging and maintenance of the intake and drainage outlets of the downstream river; therefore, according to the solution of the present invention, as an engineering application, a series of problems still need to be solved, so its practical value is not very high. .

(3) The Chinese patent "Water Cushion Pond Filling and Draining System That Can Generate Electricity" with the Patent Publication No. CN103556611B provides a pumped-storage power plant house in the drainage corridor of the Erdao dam, and the reversible hydro-turbine generator set is arranged to utilize water The water energy drop of the automatic filling and drainage of the pad pond and the seepage water of the mountains on both sides are collected for power generation, which meets the needs of the maintenance and drainage of the pad pond and reduces the energy consumption of the auxiliary system of the power station; the maintenance equipment can be used for long-term power generation, It also improves the utilization rate of the equipment and reduces the failure rate of the equipment; the system greatly reduces the power consumption during charging and drainage and the operation and maintenance costs during the operation of the auxiliary system of the power station, and the technical solution is more reliable, more energy-saving and environmentally friendly.

However, in terms of the shortcomings of the above-mentioned Chinese patent "Water Supply and Drainage System for Water Pad Pond" with the patent number of 201020554462.5, there is no corresponding consideration, so it also limits the use of the water pad pond filling and drainage system that can generate electricity in the water pad pond maintenance and drainage facilities. really use.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a safe, reliable and feasible water cushion pond maintenance, drainage and water refilling system, drainage method and water refilling method in view of the above existing problems.

The technical scheme adopted in the present invention is: a water cushion pond maintenance drainage and water backfilling system, which is arranged in the second dam, and is characterized in that it has:

The self-flowing filling and draining pipe connects the upstream water cushion pond and the downstream river channel of the Erdaoba, and is equipped with a filling and draining valve group;

a flow meter, installed on the artesian filling and draining pipe, used to obtain the flow change in the artesian filling and draining pipe;

The sump is set at the bottom of the water cushion pond in the area where the second dam is connected, and a double-layer trash rack is arranged at the water inlet of the sump;

The maintenance and drainage pipelines include the maintenance water intake pipe, the maintenance drainage main pipe I, the maintenance drainage branch pipe and the maintenance drainage main pipe II. The maintenance and drainage main pipes II are connected through several maintenance and drainage branch pipes, and the water outlet of the maintenance and drainage main pipes II is connected to the downstream river; wherein the maintenance water intake pipe is provided with a maintenance water intake isolation valve, and the maintenance drainage branch pipe is provided with a maintenance drainage pump;

The backwash pipeline includes the maintenance water intake pipe, the maintenance drainage main pipe I and the maintenance drainage main pipe II. The maintenance drainage main pipe I and the maintenance drainage main pipe II are connected by the backwash pipe, and the backwash pipe is equipped with a backwash valve group;

The pressure transmitter is installed in the maintenance and drainage main pipe I, and is used to monitor the water level of the sump in the water cushion pond;

control and monitor system, connected with the flow meter and pressure transmitter circuit;

The maintenance water intake pipes are divided into maintenance water intake pipes I and maintenance water intake pipes II, wherein the water intakes of the maintenance water intake pipes I and II are respectively located at different elevations in the sump.

The water outlet of the maintenance and drainage main pipe II is connected to the self-flowing filling and draining pipe through a tee, and the filling and draining valve group includes an upstream filling and draining valve group located upstream of the tee and a downstream filling and draining valve group located downstream of the tee.

The elevation of the part connected to the maintenance drainage main pipe II on the self-flowing filling and draining pipe is higher than the elevation of the ports at both ends thereof.

A trash rack is provided at the water intake of the maintenance water intake pipe.

The maintenance and drainage pumps on some of the maintenance and drainage branches are small maintenance and drainage pumps, and the maintenance and drainage pumps on the other maintenance and drainage branches are large maintenance and drainage pumps.

The maintenance drainage main pipe II is divided into the maintenance drainage main pipe II-I and the maintenance drainage main pipe II-II. The maintenance drainage small pump and part of the maintenance drainage large pump are connected to the maintenance drainage main pipe II-I, and the rest of the maintenance drainage large pipes are connected. The pump communicates with the maintenance and drainage mains II-II.

The artesian filling and draining pipe is divided into an artesian filling and draining pipe I connected with the maintenance and drainage main pipe II-I and an artesian filling and draining pipe II connected with the maintenance and drainage main pipe II-II.

The end connected with the downstream river channel of the self-flowing filling and draining pipe is provided with a flange capable of installing a blind plate.

A drainage method for the maintenance drainage and backfilling water system of the water cushion pond, characterized in that:

Open the filling and draining valve group on the self-flowing filling and draining pipe, and discharge all the water in the water cushion pond higher than the water level of the downstream river into the downstream river;

According to the flow signal change of the flow meter on the artesian filling and draining pipe, judge the water level in the water cushion pond and the water level in the downstream channel;

When the water level of the water cushion pond is basically the same as the water level of the downstream river, turn off the filling and draining valve group, open the maintenance water intake isolation valve on the maintenance water intake pipe I, and pass the water body in the water cushion pond through the maintenance water intake pipe I, the maintenance drainage main pipe I, and the maintenance The drain branch pipe is introduced to the maintenance drain pump;

Start several maintenance and drainage pumps, pump the water in the water cushion pond to the water level near the water intake of the maintenance water intake pipe I, stop the maintenance drainage pump pumping water, and close the maintenance water intake isolation valve on the maintenance water intake pipe I;

Open the backwash valve group on the backwash pipe, open the maintenance water intake isolation valve on the maintenance water intake pipe II, and use the water pressure of the downstream tail water higher than the water level in the upstream pad pool to flush the trash rack and the maintenance water intake pipe II;

After flushing, close the backwash valve group, and use several maintenance and drainage pumps to drain the remaining water in the pad pool;

Use the pressure transmitter signal set on the maintenance drainage main I to monitor the water level in the sump in the water cushion pond, and control several maintenance drainage pumps to discharge the accumulated water in the sump in the water cushion pond.

A water backfilling method for the maintenance drainage and backfilling water system of the water cushion pond, characterized in that:

Open the filling and draining valve group on the self-flowing filling and draining pipe, and use the water level of the downstream river to be higher than the elevation of the inner floor of the water-cushion pond, and recharge the water downstream of the second dam to the water-cushioning pond through the self-flowing filling and draining pipe;

The flow of water passing through the artesian filling and draining pipeline is monitored by the data transmitted by the flowmeter set on the artesian filling and draining pipeline, and then it is judged whether the water filling is completed;

When the water filling is completed, close the filling and draining valve group on the self-flowing filling and draining pipeline.

The beneficial effects of the present invention are as follows: the present invention solves the influence of the rolling stones in the pond in the maintenance and drainage system of the water cushion pond on the water intake by setting water intakes with different elevations, and can also solve the problem of floating objects and sediment deposition on the maintenance and drainage system of the water cushion pond. Sedimentation and equipment safe operation.

The invention solves the large amount of water pumping at the initial stage and the automatic pumping and draining system of seepage and accumulated water for maintenance in the pond at the later stage by setting up pump groups of different sizes; setting a reasonable backwash pipeline prepares backup measures for solving the blockage problem of water intake and drainage.

In the present invention, the filling and draining pipelines during the maintenance of the water cushion pond are set by combining the maintenance of the water intake pipe, the maintenance drainage main pipe I, the maintenance drainage branch pipe, the maintenance drainage main pipe II and the self-flow filling and drainage pipe, and considering the setting at a reasonable water level elevation, it can not only be It can meet the needs of artesian filling and drainage without causing blockage, and can also use the powerful drainage capacity of the pump set to provide safety protection for the self-flowing filling and drainage pipelines to prevent clogging and debris from entering the pipeline, and at the same time, the self-flowing filling and drainage can be The pipelines and equipment are installed in the dam body of the second dam and the special valve room at a reasonable elevation, which not only solves the blocking of the downstream river drainage outlet, but also reduces the difficulty of blocking the water intake in the past and the risk of blocking. .

Description of drawings

FIG. 1 is a schematic structural diagram of an embodiment.

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1 .

FIG. 3 is a cross-sectional view taken along line B-B of FIG. 1 .

FIG. 4 is a C-C cross-sectional view of FIG. 1 .

Figure 5 is an axonometric view of piping and equipment in the embodiment.

In the figure: 1. Water collection tank; 2. Trash rack; 3. Maintenance of water intake pipe I; 4. Maintenance of drainage main pipe I; 5. Maintenance of drainage branch pipe; 6. Maintenance of water intake pipe II; Artesian filling and draining pipe I; 702, self-flowing filling and draining pipe II; 8. Inspection and drainage main pipe II; 801, inspection and drainage mains II-I; 802, inspection and drainage mains II-II; 9. Inspection and maintenance of water intake isolation valve; 10. Inspection and drainage Large pump; 11. Water intake; 12. Backwash pipe; 13. Pressure transmitter; 14. Corrugated expansion joint; 15. Maintenance of small drainage pump; 16. Maintenance of isolation ball valve after large pump; Gate valve; 18. Hydraulic control valve after large pump; 20. Maintenance isolation ball valve before large pump; 21. Maintenance isolation ball valve before small pump; 22. Hydraulic control valve after small pump; 23. Pressure-making gate valve after small pump; 24. Small pump Inspection isolation ball valve after pump; 25, backwash isolation ball valve; 26, backwash operation ball valve; 27, flow meter; 28, self-flow filling and drainage maintenance valve; 29, flow filling and drainage operation valve; 30, blind plate; 31, flange .

Detailed ways

This embodiment is an overhaul, drainage and backfilling water system for a water cushion pond, which is installed in the second dam and has: a self-flowing filling and draining pipe, a sump, an overhauling and draining pipeline, a backwashing pipeline, and a control and monitoring system.

In this embodiment, the self-flowing filling and draining pipe has the self-flowing filling and draining pipe I and the self-flowing filling and draining pipe II. Both the self-flowing filling and draining pipe I and the self-flowing filling and draining pipe II are connected to the water cushion pond upstream of the second dam and the downstream river, and the artesian filling and draining The connecting ends of the pipe I and the self-flowing filling and draining pipe II with the downstream channel are provided with flanges capable of installing blind plates.

In the area where the center line of the bottom of the reverse arch water cushion pond is connected with the second dam, a collection tank is set up, and a trash rack is set in front of the collection tank to prevent larger and more rolling stones from falling into the collection tank when the water cushion pond is flooded. Keep the sump from filling up with rocks.

In this embodiment, the maintenance drainage pipeline includes maintenance water intake pipe, maintenance drainage main pipe I, maintenance drainage branch pipe and maintenance drainage main pipe II, wherein the maintenance water intake pipe has two maintenance water intake pipes I and one maintenance water intake pipe II, and the maintenance water intake pipe I , II are equipped with maintenance water isolation valve. The water intakes of the maintenance water intake pipes I and II are connected to the water collecting tank and are equipped with a trash rack. The water intake of the maintenance water intake pipe I is arranged at a higher elevation than the bottom elevation of the water cushion pond, and the water intake of the maintenance water intake pipe II is arranged below the bottom elevation of the water cushion pond. It can avoid being blocked by debris in the water body in the pond as much as possible, and ensure that a large amount of accumulated water in the water cushion pond is pumped to the downstream river through this channel, which is located at the bottom of the sump, so that the water cushion can be automatically collected after the sump is dredged. A small amount of seepage and accumulated water in the pond.

In this example, the water outlets of two maintenance water intake pipes I and one maintenance water intake pipe II are jointly connected to the maintenance drainage main pipe I, and a corrugated expansion joint is arranged on the maintenance drainage main pipe I.

In this embodiment, the maintenance and drainage main pipe II is divided into maintenance and drainage main pipe II-I and maintenance and drainage main pipe II-II. The self-flowing filling and draining pipe II shall be connected horizontally to prevent sediment from entering the maintenance and drainage main pipe II, resulting in siltation of the maintenance and drainage main pipe II. On the self-flowing filling and draining pipe I and the self-flowing filling and draining pipe II, an upstream filling and draining valve group is installed on the upstream of the tee, and a downstream filling and draining valve group is installed in the downstream of the tee. The upstream filling and draining valve group includes an artesian filling and draining inspection valve and an artesian filling and draining operation valve, and the downstream filling and draining valve group includes an artesian filling and draining operation valve and an artesian filling and drainage inspection valve.

In this example, the elevation of the parts connected to the maintenance and drainage mains II-I and II-II on the self-flowing filling and drainage pipes I and II is higher than the elevation of the ports at both ends, so as to avoid the influence of the upstream and downstream sediment deposition on the maintenance and drainage system of the water cushion pond and ensure that the The smooth flow of system pipelines and equipment. The maintenance and drainage mains II-I and II-II are horizontally connected to the corresponding artesian filling and drainage pipes I and II to prevent sediment from entering the maintenance and drainage mains II-I and II-II.

In this embodiment, the maintenance drainage main pipe I and the maintenance drainage main pipe II-I are connected through a number of maintenance drainage branch pipes, some maintenance drainage branch pipes are equipped with maintenance drainage small pumps, and the other maintenance drainage branch pipes are equipped with maintenance drainage large pumps; The main pipe I and the maintenance drainage main pipe II-I are connected through a number of maintenance and drainage branch pipes, and a large maintenance and drainage pump is installed on the maintenance and drainage branch pipes.

In this example, the maintenance drainage branch pipe before the large pump is equipped with a large pump maintenance isolation ball valve, and the maintenance drainage branch after the pump is equipped with a large pump rear hydraulic control valve, a rear pressure gate valve and a large pump rear maintenance isolation ball. ball valve. The maintenance drainage branch pipe in front of the small pump is equipped with a small pump front maintenance isolation ball valve, and the maintenance drainage branch after the pump is equipped with a small pump rear hydraulic control valve, a small pump rear pressure gate valve and a small pump rear maintenance isolation ball valve.

In this embodiment, the backwashing pipeline includes a backwashing pipe, as well as the maintenance water intake pipe II, the maintenance drainage main pipe I, the maintenance drainage main pipe II-I and the self-flow charging and drainage pipe I in the maintenance drainage pipeline, the maintenance drainage main pipe I and the maintenance drainage pipe The main pipes II-I are connected through a backwashing pipe. The backwashing pipe is equipped with a backwashing valve group. The backwashing valve group includes a backwashing operation ball valve and a backwashing isolation ball valve.

In this embodiment, a flowmeter and a pressure transmitter are connected to the circuit of the control and monitoring system, wherein the flowmeter is installed on the artesian filling and draining pipe, and is used to obtain the flow change in the artesian filling and draining pipe; the pressure transmitter is being repaired. There are two on the main drainage pipe I, which are used to monitor the water level of the sump in the water cushion pond.

In the present embodiment, the maintenance and drainage method of the water cushion pond includes the following steps:

The maintenance and drainage of the water-cushion pond is generally arranged to discharge the accumulated water in the water-cushion pond to the downstream when the downstream water level is low. The accumulated water in the pad pond is discharged to the downstream, reducing the energy consumption of the system operation.

Open the self-flowing filling and draining maintenance valve, the self-flowing filling and draining operation valve, etc. on the self-flowing filling and draining pipe, connect the upstream water cushion pond of the Erdaoba and the downstream river through the artesian filling and draining pipe, and connect all the water in the water cushion pond higher than the water level of the downstream river. The water body is discharged into the downstream river channel.

According to the flow signal change of the flow meter on the artesian filling and draining pipe, the water level in the water cushion pond and the water level in the downstream river channel are judged.

When the water level of the water cushion pond is basically the same as the water level of the downstream river, close the artesian filling and draining operation valves, etc., upstream of the tee on the artesian filling and draining pipe respectively, open the water intake and set the maintenance water intake isolation on the maintenance water intake pipe I with a higher elevation. The valve is used to introduce the corresponding water body with better water quality in the water cushion pond to the front of the pump equipment of the pumping and drainage system composed of large and small pumps.

Using on-site control equipment, power transformation and distribution equipment, power cables, data optical fibers, control and monitoring systems and other related equipment, start several large maintenance and drainage pumps, and pump the water in the pad pond to the water level to two sets at a higher elevation. Check the vicinity of the water intake of the water intake pipe I, and stop the maintenance of the large drainage pump to pump water.

Close the maintenance water isolation valve on the maintenance water intake pipe I, close the maintenance isolation ball valve before closing the large pump and the maintenance isolation ball valve before the small pump, open the backwash pipe operation ball valve and the backwash pipe isolation ball valve, and open the maintenance water intake isolation valve on the maintenance water intake pipe II. The valve can use the water pressure of the downstream tail water higher than the water level in the upstream water cushion pond to flush the trash rack and maintenance water intake pipe II in and in front of the sump.

After flushing, close the backwashing pipe operation ball valve on the backwashing pipe and the isolation ball valve of the backwashing pipe, open the large pump and overhaul the isolation ball valve before the small pump, and use several large maintenance drainage pumps and small maintenance drainage pumps to Drain the remaining stagnant water in the pond.

Stop the large maintenance drainage pump, switch the small maintenance drainage pump to automatic operation mode, use the signals of the two pressure transmitters set in the maintenance drainage pipe I to monitor the water level in the sump in the water cushion pond, and control the small maintenance drainage pump to discharge the water cushion Accumulation of water in a sump in a pond.

In the present embodiment, the method for refilling water after the maintenance of the water cushion pond is completed includes the following steps:

Open the self-flowing filling and draining maintenance valve, the self-flowing filling and draining operation valve, etc. on the self-flowing filling and draining pipe, and connect the upstream water cushion pond and the downstream river channel of the second dam through the self-flowing filling and draining pipe.

The water level in the downstream channel is higher than the elevation of the inner floor of the water cushion pond, so that the water downstream of the Erdaoba can be recharged to the water cushion pond through the artesian filling and drainage pipes.

The data monitoring transmitted by the flow meter set on the artesian filling and draining pipe can monitor the flow of water passing through the artesian filling and draining pipe, and then judge whether the water filling is completed.

When the water filling is completed, close the self-flowing filling and draining operation valve, etc. on the self-flowing filling and draining pipeline.

When the water cushion pond releases floods, the dam deep hole accident gate can be partially opened to first fill the water cushion pond to the crest elevation of the Erdao dam, and then fully open the dam deep hole accident gate to meet the flood discharge requirements.

In this embodiment, the equipment maintenance of the drainage system of the pond is divided into two levels. The operation steps of the first layer are as follows: First, close the filling and draining valve group on the self-flowing filling and draining pipe to cut off the water in the upstream water cushion pond and the water in the downstream river, and realize the residual water in the drainage pump room in the second dam and the self-flowing filling and draining valve in the room. Overhaul of all equipment. The second layer implements the operation steps. First, drain the water body in the water cushion pond, and then fasten the blind plate to the flange on the self-flow filling and drainage pipe to cut off the downstream water. Overhaul of all equipment in the drain valve room.

For water conservancy and hydropower projects with large water cushion ponds, after the safe and reliable water cushion pond filling and drainage system of the present invention is adopted, the main pumping and drainage equipment, power transformation and distribution equipment and lifting equipment can be arranged at suitable positions in the second dam , used for maintenance, pumping and drainage needs in the water cushion pond; set up maintenance water intake pipes for water intakes at different elevations, set the artesian filling and draining valve chamber at a higher position, and combine the artesian filling and drainage pipes with the pumping and drainage mains, and arrange them at the elevation above the downstream riverbed. , and arranged along the slope, which can avoid the influence of sediment deposition upstream and downstream of the second dam on the maintenance and drainage system of the water cushion pond to the greatest extent, and ensure the smooth flow of the system pipeline and equipment; In the corridor on one side of the pond, the use of the slope of the water cushion pond and the bottom plate can avoid the impact of the high-speed water flow on the bottom plate when the water cushion pond is filled with water, and play a better role in energy dissipation, so that the maintenance and drainage system of the water cushion pond can resist clogging. , moisture resistance and resistance to valley extrusion deformation have been greatly improved. At the same time, the system can also be equipped with a local operation and remote control monitoring system, which can realize automatic filling and drainage control, which is convenient for operators to operate, avoids the cumbersome construction of the temporary filling and drainage system and the hidden safety hazards of system operation, and can better ensure the safety of the water cushion pond. Stable operation. At the same time, the system does not need to increase additional investment, saves the filling and drainage time during maintenance, and greatly improves the filling and drainage efficiency of the water cushion pond. In addition, the system greatly reduces the power consumption during filling and drainage, and the technical solution is more energy-saving and environmentally friendly.

Claims (10)

1. a water cushion pond maintenance drainage and backfill water system, is arranged in the Erdao dam, is characterized in that, has: The self-flowing filling and draining pipe (7) connects the upstream water cushion pond and the downstream river channel of the Erdaoba, and is equipped with a filling and draining valve group; a flowmeter, installed on the artesian filling and draining pipe (7), for obtaining the flow change in the self-flowing filling and draining pipe (7); A water collecting pond (1) is arranged at the bottom of the water cushion pond in the area where the second dam is connected, and a trash rack (2) is arranged at the water inlet of the collecting pond; Maintenance of the drainage pipeline, including maintenance of the water intake pipe, maintenance of the drainage main pipe I (4), maintenance of the drainage branch pipe (5) and maintenance of the drainage main pipe II (8). One end is connected to the maintenance and drainage main pipe I (4), the maintenance and drainage main pipe I (4) and the maintenance and drainage main pipe II (8) are connected through a number of maintenance and drainage branch pipes (5), and the water outlet of the maintenance and drainage main pipe II (8) is connected to the downstream. River; wherein said maintenance water intake pipe is equipped with maintenance water intake isolation valve (9), and said maintenance drainage branch pipe (5) is provided with maintenance drainage pump; The backwashing pipe (12), including the maintenance water intake pipe, the maintenance drainage main pipe I (4) and the maintenance drainage main pipe II (8), are backwashed in the maintenance drainage main pipe I (4) and the maintenance drainage main pipe II (8). The pipes (12) are connected, and the backwashing pipe (12) is provided with a backwashing valve group; A pressure transmitter (13), installed in the maintenance and drainage main pipe I (4), is used to monitor the water level of the sump (1) in the water cushion pond; a control and monitoring system, connected with the flowmeter and the pressure transmitter (13) in an electrical circuit; The maintenance water intake pipes are divided into maintenance water intake pipes I (3) and maintenance water intake pipes II (6), wherein the water intakes (11) of the maintenance water intake pipes I and II are respectively located at different elevations in the water collecting tank (1). 2. The water cushion pond maintenance drainage and backfill water system according to claim 1, characterized in that: the water outlet of the maintenance drainage main pipe II (8) is connected to the self-flow filling and drainage pipe (7) through a tee, The filling and draining valve group includes an upstream filling and draining valve group located upstream of the tee and a downstream filling and draining valve group located downstream of the tee. 3. The water cushion pond maintenance drainage and backfilling water system according to claim 2, characterized in that: the elevation of the part connected to the maintenance drainage main pipe II (8) on the self-flow filling and drainage pipe (7) is higher than its two ends Port elevation. 4. The water-cushion pond maintenance drainage and backfill water system according to claim 1, characterized in that: a trash rack (2) is provided at the water intake (11) of the maintenance water intake pipe. 5. The water cushion pond maintenance drainage and backfilling system according to any one of claims 1 to 3, wherein the maintenance drainage pump on part of the maintenance drainage branch pipe (5) adopts the maintenance drainage small pump (15). ), the maintenance drainage pump on the remaining maintenance drainage branch pipes (5) adopts the maintenance drainage large pump (10). 6. The water cushion pond maintenance drainage and backfill water system according to claim 5, characterized in that: said maintenance drainage main pipe II (8) is divided into maintenance drainage main pipe II-I (801) and maintenance drainage main pipe II- II (802), the small maintenance drainage pump (15) and part of the maintenance drainage large pump (10) are connected to the maintenance drainage main pipe II-I (801), and the remaining large maintenance drainage pumps (10) are connected to the maintenance drainage Drain Main II-II (802). 7. The water-cushion pond maintenance drainage and backfill water system according to claim 6, characterized in that: the self-flow filling and drainage pipes (7) are divided into self-flowing pipes connected to the maintenance and drainage main pipes II-I (801). The filling and draining pipe I (701) and the self-flowing filling and draining pipe II (702) connected with the maintenance and drainage main pipe II-II (802). 8. The water cushion pond maintenance, drainage and backfilling system according to claim 1, characterized in that: the end of the self-flowing filling and draining pipe (7) connected to the downstream river channel is provided with a method for installing a blind plate (30). orchid (31). 9. A drainage method of the water cushion pond maintenance drainage and backfill water system according to any one of claims 1 to 8, characterized in that: Open the filling and draining valve group on the self-flowing filling and draining pipe (7), and discharge all the water in the water cushion pond higher than the water level of the downstream river into the downstream river; According to the flow signal change of the flow meter on the self-flow filling and draining pipe (7), judge the water level in the water cushion pond and the water level in the downstream channel; When the water level of the water cushion pond is basically the same as the water level of the downstream river, turn off the filling and draining valve group, open the maintenance water intake isolation valve (9) on the maintenance water intake pipe I (3), and pass the water body in the water cushion pond through the maintenance water intake pipe I (9). 3) The main maintenance drainage pipe I (4) and the maintenance drainage branch pipe (5) are introduced to the maintenance drainage pump; Start several maintenance and drainage pumps, pump the water in the water cushion pool to the water level near the water intake (11) of the maintenance water intake pipe I (3), stop the maintenance drainage pump pumping water, and close the maintenance water intake isolation on the maintenance water intake pipe I (3). valve (9); Open the backwash valve group on the backwash pipe (12), open the maintenance water intake isolation valve (9) on the maintenance water intake pipe II (6), and use the water pressure of the downstream tail water higher than the water level in the upstream pad pool to block the sewage. The grid (2) and the maintenance water intake pipe II (6) are flushed; After flushing, close the backwash valve group, and use several maintenance and drainage pumps to drain the remaining water in the pad pool; Use the signal of the pressure transmitter (13) set on the main maintenance drainage pipe I (4) to monitor the water level in the sump (1) in the water cushion pond, and control several maintenance drainage pumps to discharge the water in the sump (1) in the water cushion pond. standing water. 10. A water backfilling method for the maintenance, drainage and backfilling water system of a water cushion pond according to any one of claims 1 to 8, characterized in that: Open the filling and draining valve group on the self-flowing filling and draining pipe (7), and make use of the water level of the downstream channel to be higher than the elevation of the inner floor of the water-cushion pond, and recharge the water from the downstream of the second dam to the water-cushioning pond through the self-flowing filling and draining pipe (7); The flow of water passing through the artesian filling and draining pipe (7) is monitored by the data transmitted by the flow meter arranged on the road of the artesian filling and draining pipe (7), and then it is judged whether the water filling is completed; When the water filling is completed, close the filling and draining valve group on the self-flowing filling and draining pipe (7).

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