CN211472426U - A kind of maintenance system for deep scoop stilling basin - Google Patents

Abstract

The utility model belongs to the technical field of water conservancy and hydropower, in particular to an overhaul system for a large water deep scoop type stilling pool. Compared with the existing technology, a permanent pumping and drainage system is set up and the cofferdam core wall structure is overhauled, and the top elevation of the overhaul cofferdam core wall is slightly higher than the lowest downstream tailwater level + the wave climbs up, eliminating the need for temporary filling of the cofferdam ; The maintenance cofferdam core wall is located at the downstream end of the protective tank, away from the mainstream area of flood discharge and energy dissipation, and adopts the structural type of the protection of rockfill bodies on both sides of the concrete maintenance cofferdam core wall, with good reliability and durability; maintenance of the cofferdam core Anti-seepage and water-stop materials are respectively set between the two ends of the wall, the rock slope and the guide wall between the plant and the dam, and the anti-seepage curtain is set for the foundation of the maintenance cofferdam core wall, which has a good anti-seepage effect; There is a pumping and drainage system, which includes the maintenance of the collecting well and the pumping room of the collecting well, as well as the embedded pipe connecting the stilling pond, the water body in the protective tank and the collecting well, which eliminates the need for the layout and dismantling of temporary pumping and drainage equipment. .

Description

A kind of maintenance system for deep scoop stilling basin

technical field

The utility model belongs to the technical field of water conservancy and hydropower, in particular to an overhaul system for a large water deep scoop type stilling pool.

Background technique

For a hydropower station where the barrage is a concrete gravity dam and the powerhouse is a dam-rear type, the overflow dam section is generally arranged on one side of the river bed, the other side of the river bed is the power plant room dam section, and there is a sand-scouring bottom hole dam section and a guide wall between the plant and dam in the middle. . When the flood discharge and energy dissipation structure adopts a scoop-type stilling pool, in order to ensure the energy-dissipation effect of the scoop-type stilling pool, the downstream water depth is generally larger. For those submerged under water, when the scoop-type stilling pool needs to be overhauled, the usual practice is: (1) during the dry season, close the overflow surface hole and the gate of the bottom hole for flushing sand, and stop the flow of water from the flood discharge structure; (2) in the scooter Temporary earth-rock cofferdams shall be filled in appropriate positions downstream of the stilling pool for temporary water retention during maintenance; (3) Pumps are temporarily placed in the stilling pools and the temporary cofferdams for pumping and drainage until the stilling pools are pumped and drained. (4) During the inspection, use the powerhouse unit to generate electricity and discharge water to ensure that the side of the scoop stilling pool is dry construction; (5) Check or repair the scoop stilling pool, and after the overhaul is completed, remove the temporary cofferdam on the water. Part of the overflow meter hole gate is opened to restore the submerged state of the scoop stilling pool. In order to ensure that the scoop-type stilling pool is in dry construction conditions during inspection or maintenance, the filling of the downstream temporary maintenance cofferdam, air closure, foundation pit pumping and drainage, stilling scooter maintenance and cofferdam removal must be completed within a dry period. , the process is more. For the scoop-type stilling pool, due to the large downstream water depth, the filling amount of the temporary cofferdam is generally large, the construction speed is slow, and the filling is underwater, so the effect of anti-seepage and air-sealing is difficult to guarantee; The power of the water pump is large, the temporary cables and the drainage pump are difficult to arrange, and the installation and dismantling take a long time; the maintenance cofferdam is a temporary project, which will be washed away during the flood discharge, and it needs to be refilled in the next maintenance, which is time-consuming, labor-intensive and expensive. The above have become the major difficulties in the maintenance of the stilling pool.

In order to avoid filling the temporary cofferdam, it is also considered to set up a movable flap door at the position of the protective tank. Usually, the flap door is stowed, and when it is necessary to block water, the flap door is extended. However, when the downstream water depth and the width of the stilling pool are relatively large, the size of a flap door cannot be too large, and a structural pier needs to be set on the protective tank to support the flap door. Structural piers and flap doors are easily damaged and deformed, and their reliability is poor. In addition, the metal structure of the flap door has been underwater for many years, and it is difficult to repair and maintain itself. Once it fails, it will not be able to be used normally.

Utility model content

The purpose of the utility model is to provide a maintenance system for a large water deep scoop type stilling pool in view of the deficiencies existing in the prior art.

For this reason, the above-mentioned purpose of the present utility model is achieved through the following technical solutions:

An overhaul system for a large water deep scoop type stilling pool, characterized in that the maintenance system for the large water deep scoop type stilling pool includes an overflow dam section dam body, and the downstream of the overflow dam section dam body is a stilling scooter The tail of the stilling shovel is provided with a stilling sill, the downstream of the stilling shovel is provided with a protective tank, and the tail of the protective tank is provided with a maintenance cofferdam core wall, and the maintenance cofferdam core wall The top elevation is slightly higher than the downstream minimum tail water level; a powerhouse dam section is arranged on the riverbed side of the dam body of the overflow dam section, a powerhouse tailrace channel is arranged downstream of the powerhouse dam section, and the overflow dam section dam body and There is a sand flushing bottom hole dam section between the powerhouse dam sections, and a pumping and drainage system is arranged in the sand flushing bottom hole dam section. The water is pumped from the pool and the guard tank, and the pumping and drainage system is also connected with the powerhouse tailrace to discharge the water pumped from the stilling pond and the guardtank into the powerhouse tailrace, which is connected to the guardtank. There is a guide wall between the plant and the dam to separate the powerhouse tailrace and the protective tank.

While adopting the above technical solutions, the present invention can also adopt or combine the following technical solutions:

As a preferred technical solution of the present invention, the drainage system includes an overhaul water collection well, a first pre-embedded pipe and a second pre-embedded pipe are arranged on the side of the overhaul water collection well, and the first pre-embedded pipe is used to communicate with the overhaul water collection well As with the stilling scoop, the second pre-embedded pipe is used to communicate the maintenance water well and the protective tank. Above the maintenance water well is a water well pump house, and a plurality of water pumps are arranged in the water collection well pump house.

As a preferred technical solution of the present utility model, the stilling pond is provided with a stilling pond side wall on the side close to the bank slope, the downstream side wall of the stilling pond is a rock slope .

As a preferred technical solution of the present invention, the connection between the rock slope and the maintenance cofferdam core wall is provided with anti-seepage and water-stop materials, and the connection between the maintenance cofferdam core wall and the guide wall between the plant and dam is also provided There are anti-seepage and water-proof materials.

As a preferred technical solution of the present invention, the bottom of the maintenance cofferdam core wall is provided with an anti-seepage curtain.

As a preferred technical solution of the present invention, rockfill bodies with a certain slope are arranged on both sides of the core wall of the maintenance cofferdam.

As a preferred technical solution of the present invention, the drainage system and the maintenance cofferdam core wall are both permanent structures.

Compared with the prior art, the utility model provides a maintenance system for a large-water deep scoop type stilling pool. Compared with the prior art, a permanent pumping and drainage system and a maintenance cofferdam core wall structure are arranged, and the top elevation of the concrete maintenance cofferdam core wall is slightly higher. At the lowest downstream tailwater level + wave climbing, the temporary filling of the cofferdam is avoided; the maintenance cofferdam core wall is located at the downstream end of the protective tank, away from the mainstream area of flood discharge and energy dissipation, and concrete is used to repair the rockfill on both sides of the cofferdam core wall The reliability and durability of the cofferdam core wall are relatively good; seepage-proof and water-proof materials are respectively set between the two ends of the cofferdam core wall and the rock slope and the guide wall between the plant and dam, and the foundation of the cofferdam core wall is set up. The anti-seepage curtain has good anti-seepage effect; there is a pumping and drainage system in the dam section at the bottom of the sand flushing, and the pumping and drainage system includes the maintenance of the collecting well and the pump room of the collecting well, as well as the connection between the stilling pool and the water body in the protective tank. The pre-embedded pipe of the water collecting well avoids the layout and dismantling of the temporary pumping and draining equipment; the maintenance system of the large water deep scoop stilling pool provided by the utility model can quickly drain the water body in the scoop stilling pool, and has high reliability , can be reused, provide sufficient construction period for the overhaul of the stilling pool, and greatly reduce the operation and maintenance costs.

Description of drawings

Fig. 1 is the floor plan of the large water deep scoop type stilling basin maintenance system provided by the utility model;

Fig. 2 is the schematic diagram of A-A direction in Fig. 1;

Fig. 3 is the schematic diagram of B-B direction in Fig. 1;

Fig. 4 is the schematic diagram of C-C direction in Fig. 1;

In the picture: 1-overflow dam section dam body; 2-stilling pond; 3-stilling pond tail sill; 4-protection tank; 5-maintenance cofferdam core wall; 6-stilling pond side wall; 7- Rock slope; 8-sand bottom hole dam section; 9-guide wall between plant and dam; 10-powerhouse dam section; 11-powerhouse tailrace; 12-first embedded pipe; 13-second embedded pipe; 14- Overhaul water collection well; 15- Water collection well pump room; 16- Rockfill body; 17- Anti-seepage curtain; 18- Water pump.

Detailed ways

The present utility model will be described in further detail with reference to the accompanying drawings and specific embodiments.

An overhaul system for a large-water deep stilling pool, comprising an overflow dam section dam body 1, the downstream of the overflow dam section dam body 1 is a stilling pool 2, and the tail of the stilling pool 2 is provided with a stilling pool tail sill 3. There is a protective tank 4 downstream of the stilling tank 2, and the rear of the protective tank 4 is provided with a maintenance cofferdam core wall 5, and the top elevation of the maintenance cofferdam core 5 is slightly higher than the downstream minimum tailwater level; the stilling tank 2 On the side close to the bank slope, there is a side wall 6 of the stilling pond, downstream of the side wall 6 of the stilling pond, the side of the protective tank 4 close to the bank slope is a rocky side slope 7; There is a powerhouse dam section 10 on one side of the river bed, a powerhouse tailrace 11 downstream of the powerhouse dam section 10, and a sand-scouring bottom hole dam section 8 between the overflow dam section dam body 1 and the powerhouse dam section 10, and a sand-scouring bottom hole There is a pumping and drainage system in the dam section 8, and the pumping and drainage system is connected with the stilling shovel 2 and the protective tank 4 respectively to pump water from the stilling shovel 2 and the protective tank 4, and the pumping and drainage system is also connected with the powerhouse tailrace 11. In order to discharge the water pumped out from the stilling tank 2 and the guard tank 4 into the powerhouse tailrace 11, between the powerhouse tailrace 11 and the guard tank 4, there is a guide wall 9 between the powerhouse and the dam to separate the powerhouse tailrace. 11 and protector 4.

The pumping and drainage system includes an overhaul water collection well 14. The side of the overhaul water collection well 14 is provided with a first embedded pipe 12 and a second embedded pipe 13. The first embedded pipe 12 is used to communicate the overhaul water collection well 14 and the stilling pond 2. At the bottom of the side wall, in order not to interfere with the water flow in the stilling shovel 2 during normal flood discharge, the water current in the stilling scoop 2 is rolled and dissipated. The second pre-embedded pipe 13 is used to connect the maintenance water collection well 14 and the protective tank 4, and a water collection well is provided above the maintenance water collection well 14. The pump house 15 and the water collecting well pump house 15 are provided with a plurality of water pumps 18 .

The connection between the rock slope 7 and the maintenance cofferdam core wall 5 is provided with anti-seepage and water-proof material, and the connection between the maintenance cofferdam core wall 5 and the guide wall 9 between the plant and dam is also provided with anti-seepage and water-proof material. The bottom of the maintenance cofferdam core wall 5 is provided with an anti-seepage curtain 17 .

The two sides of the maintenance cofferdam core wall 5 are filled with rockfill bodies 16 with a certain slope.

The drainage system and the maintenance cofferdam core wall 5 are all permanent structures.

The maintenance system of the above-mentioned large water deep scoop type stilling basin adopts the following methods to carry out maintenance operations:

When the deep-water stilling pool needs to be repaired, the effective cooperation between the reduction of upstream water flow and the drop of downstream water level during the dry season and the maintenance cofferdam at the rear of the protective tank only needs to close the overflow meter hole gate and flush The flushing bottom hole gate in the sand bottom hole and dam section, through the first pre-embedded pipe and the second pre-embedded pipe in the sand bottom hole and dam section, the water body in the stilling pool and the protective tank is drained to the maintenance water collection well, and the use of The water pump in the pump house of the water collecting well pumps the water in the maintenance water collecting well to the tail water of the powerhouse. At this time, the dry ground construction environment required for the maintenance can be formed in the stilling pool and the protective tank; after the maintenance is completed, the overflow is turned on. The flow meter hole gate fills the stilling pool with water, and the normal operation can be resumed.

Compared with the prior art, the utility model provides a maintenance system for a large-water deep scoop type stilling pool. Compared with the prior art, a permanent pumping and drainage system and a maintenance cofferdam core wall structure are arranged, and the top elevation of the concrete maintenance cofferdam core wall is slightly higher. At the lowest downstream tailwater level + wave climbing, the temporary filling of the cofferdam is avoided; the maintenance cofferdam core wall is located at the downstream end of the protective tank, away from the mainstream area of flood discharge and energy dissipation, and concrete is used to repair the rockfill on both sides of the cofferdam core wall The reliability and durability of the cofferdam core wall are relatively good; seepage-proof and water-proof materials are respectively set between the two ends of the cofferdam core wall and the rock slope and the guide wall between the plant and dam, and the foundation of the cofferdam core wall is set up. The anti-seepage curtain has good anti-seepage effect; there is a pumping and drainage system in the dam section at the bottom of the sand flushing, and the pumping and drainage system includes the maintenance of the collecting well and the pump room of the collecting well, as well as the connection between the stilling pool and the water body in the protective tank. The pre-embedded pipe of the water collecting well avoids the layout and dismantling of the temporary pumping and draining equipment; the maintenance system of the large water deep scoop stilling pool provided by the utility model can quickly drain the water body in the scoop stilling pool, and has high reliability , can be reused, provide sufficient construction period for the overhaul of the stilling pool, and greatly reduce the operation and maintenance costs.

The above-mentioned specific embodiments are used to explain the present utility model, and are only preferred embodiments of the present utility model, rather than limiting the present utility model. Within the spirit of the present utility model and the protection scope of the claims, any Modifications, equivalent replacements, improvements, etc., all fall within the protection scope of the present invention.

Claims (7)

1. the maintenance system of a large water deep scoop type stilling pond, it is characterized in that, the maintenance system of described big water deep scoop type stilling pond comprises overflow dam section dam body, and the downstream of described overflow dam section dam body is a In the power tank, the tail of the stilling tank is provided with a stilling tank sill, the downstream of the stilling tank is provided with a protective tank, and the tail of the protective tank is provided with a maintenance cofferdam core wall, and the maintenance cofferdam The top elevation of the core wall is slightly higher than the downstream minimum tailwater level; a powerhouse dam section is arranged on the riverbed side of the dam body of the overflow dam section, a powerhouse tailrace channel is arranged downstream of the powerhouse dam section, and the overflow dam section dam There is a sand flushing bottom hole dam section between the body and the powerhouse dam section, and a pumping and drainage system is arranged in the sand flushing bottom hole dam section. Water is pumped from the stilling pond and the guard tank, and the pumping and drainage system is also connected with the powerhouse tailrace to discharge the water drawn from the stilling pond and the guardtank into the powerhouse tailrace, which is connected to the powerhouse tailrace. There is a guide wall between the plant and the dam between the protective tanks to separate the powerhouse tailrace and the protective tanks. 2. The maintenance system of the large water deep scoop type stilling basin according to claim 1, characterized in that, the pumping and drainage system comprises a maintenance water collection well, and the side of the maintenance water collection well is provided with a first pre-embedded pipe and a second Pre-embedded pipes, the first pre-embedded pipes are used to connect the maintenance water well and the bottom of the side wall of the stilling scoop, and the second pre-buried pipes are used to communicate the maintenance water wells and the protective tank. There is a water collection well pump room, and a plurality of water pumps are arranged in the water collection well pump room. 3. The maintenance system of the large water depth stilling pool according to claim 1, wherein the stilling pool is provided with a sidewall of the stilling pool on the side close to the bank slope, and the Downstream of the side wall of the shovel, the side of the protective tank is a rocky slope. 4. The maintenance system of the large water deep scoop type stilling basin according to claim 3, is characterized in that, the junction of described rocky slope and maintenance cofferdam core wall is provided with anti-seepage and water-stop material, and described maintenance The connection between the cofferdam core wall and the guide wall between the plant and dam is also provided with anti-seepage and water-proof materials. 5 . The maintenance system of the large water deep scoop stilling pool according to claim 1 , wherein the bottom of the maintenance cofferdam core wall is provided with an anti-seepage curtain. 6 . 6 . The maintenance system for a large water and deep scoop stilling pool according to claim 1 , wherein the two sides of the maintenance cofferdam core wall are provided with rockfill bodies with a certain slope. 7 . 7 . The maintenance system for a large water deep scoop stilling basin according to claim 1 , wherein the drainage system and the maintenance cofferdam core wall are both permanent structures. 8 .

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