CN205604193U - A high dam reservoir emptying device - Google Patents

Abstract

The utility model discloses a high dam reservoir emptying device, which comprises a diversion tunnel arranged at the bottom of a dam body or a mountain body, wherein a plugging gate which vertically slides along a gate slot is arranged in the diversion tunnel; a bypass pipeline bypassing the door slot is arranged on the outer side of the door slot, a water inlet of the bypass pipeline is positioned on the upstream side wall of the door slot, and a water outlet of the bypass pipeline is positioned on the downstream side wall of the door slot; a water drainage plug is arranged at the downstream of the water outlet of the bypass pipeline, and a plurality of layers of water drainage pipelines are arranged in the water drainage plug; and the bypass pipeline and the water drain pipeline are both provided with combined valves. The utility model discloses fine solution the technical problem of reservoir unloading, under the circumstances of facility safety guaranteeing to turn on the water, the water of reservoir is emptied as far as possible to ensure hydraulic and hydroelectric engineering's safe operation.

Description

A high dam reservoir emptying device

technical field

The utility model relates to a venting device for a high dam reservoir, which belongs to the technical field of water conservancy and hydropower engineering.

Background technique

As a commonly used venting facility in hydropower stations, gates can vent the reservoir to about 150m below the normal water level at most by setting up spillways, spillways, vent holes and other layer-by-layer drainage methods at the current technical level. For many 300m-level high dam and large reservoir projects that are about to be built in China, if they can only be emptied to about 150m below the normal water storage level, and the storage capacity of nearly 150m deep cannot be emptied, there will be emergencies such as earthquakes and wars. Under the circumstances, the water level of the reservoir is lowered insufficiently, so the project still has a relatively large risk and cannot meet the needs of safe operation of the project, so the existing technology is still not perfect.

Utility model content

The purpose of this utility model is to provide a high dam reservoir emptying device, in the case of ensuring the safety of the water discharge facilities, the water in the reservoir can be emptied as much as possible, so as to ensure the safety of water conservancy and hydropower projects. Safe operation, thereby overcoming the deficiencies of existing technologies .

The technical scheme of the utility model is achieved in that:

A high dam reservoir emptying device of the present utility model is that the device includes a diversion tunnel arranged at the bottom of the dam body or the mountain body, and the diversion tunnel is provided with a blocking gate that slides vertically along the gate slot; There is a bypass pipeline bypassing the door slot, the water inlet of the bypass pipeline is located on the upstream side wall of the door slot, and the water outlet of the bypass pipeline is located on the downstream side wall of the door slot; There is a drain plug, and a multi-layer drain pipeline is arranged in the drain plug; combined valves are arranged on the bypass pipeline and the drain pipeline.

In the aforementioned device, the combination valve is an eccentric hemispherical valve or a butterfly valve or a combination of a ball valve and a piston valve; the eccentric hemispherical valve, butterfly valve or ball valve is located on the water inlet pipeline of the piston valve.

In the aforementioned device, the water inlets of the bypass pipeline and the drain pipeline are all provided with trash traps.

In the aforementioned device, a stilling basin is provided below the front end of the water outlet of the drainage pipeline, and the water outlet of the drainage pipeline is inclined downward to face the stilling basin.

Due to the adoption of the above technical scheme, compared with the prior art, the utility model utilizes the diversion hole to be transformed into a vent hole, and there is no need to excavate a new vent hole, which effectively saves investment. In the utility model, a bypass pipeline is arranged inside the groove of the blocking gate, through which the blocking gate can be filled with hydraulic pressure, so the blocking gate can also be used as the maintenance gate of the emptying hole, and is used for the drain plug and the valve of the drain pipeline. Relevant facilities provide maintenance conditions; drain plugs are installed after the gates are blocked, and multi-layer drainage channels are set in the drainage plugs, and the venting requirements of the Gaoba reservoir are realized through the drainage channels.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is A-A sectional view of Fig. 1;

Fig. 3 is a CC sectional view of Fig. 2;

Fig. 4 is a BB sectional view of Fig. 1;

Fig. 5 is a schematic diagram of a water flow channel on a dam body or a mountain body.

The marks in the picture are: 1- diversion tunnel, 2- door slot, 3- bypass pipeline, 4- blocking gate, 5- discharge plug, 6- upper diversion tunnel, 7- flood discharge tunnel, 8 -spillway, 9-drainage pipeline, 10-trash trap, 11-eccentric hemispherical valve or butterfly valve or ball valve, 12-piston valve, 13-water outlet, 14-stilling basin.

detailed description

The utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments, but not as any limitation to the utility model.

A method for transforming the diversion tunnel of a high dam reservoir according to the utility model, as shown in Fig. 1-4, the method is to transform the diversion tunnel at the bottom of the dam body or the mountain body into a vent hole; the specific transformation method is in the diversion tunnel A bypass pipeline connecting the upstream and downstream of the blocking gate is installed in the gate slot of the blocking gate, and the downstream of the blocking gate is filled with hydraulic pressure through the bypass pipeline to reduce the water pressure difference between the upstream and downstream sides of the blocking gate At the same time, a drain plug is set in the diversion tunnel downstream of the blocking gate, and a multi-layer drain pipeline is arranged in the drain plug, through which the water in the reservoir is further emptied; the bypass pipeline and the drain pipe There is a combined valve on the road. The combination valve adopts the method of eccentric hemispherical valve + piston valve, or the method of butterfly valve + piston valve; or the method of ball valve + piston valve; the piston valve is the working valve, and the eccentric hemispherical valve or butterfly valve or ball valve is the accident maintenance or protection valve; The eccentric hemispherical valve or butterfly valve or ball valve is located on the piston valve inlet pipe; the water retaining head of the combined valve can reach 300 meters or more, and the head of the dynamic water operation can reach 250 meters or more; Safe venting requirements for 300-meter-class dams. The water inlets of the bypass pipeline and the discharge pipeline are equipped with trash traps, through which large dirt in the water can be intercepted from entering the pipeline to avoid pipeline blockage. The outlet of the pipeline behind the piston valve in the bypass pipeline is inclined downward to avoid the impact of the water flow on the side wall of the cavern when the hydraulic pressure is filled. A stilling pool is provided under the front end of the outlet of the drainage pipeline, and the outlet of the drainage pipeline is inclined downward to face the stilling basin; to ensure that the outlet water flows into the stilling basin from top to bottom to enhance the energy dissipation effect.

A kind of venting device for high dam reservoirs of the present invention constituted according to the method described above comprises a diversion tunnel 1 arranged at the bottom of the dam body or a mountain body, and the diversion tunnel 1 is provided with a plugging gate 4 that slides vertically along the gate groove 2; The outside of the door slot 2 is provided with a bypass pipeline 3 bypassing the door slot 2, the water inlet of the bypass pipeline 3 is located on the upstream side wall of the door slot, and the water outlet of the bypass pipeline 3 is located on the downstream side wall of the door slot 2 ; The downstream of the water outlet of the bypass pipeline 3 is provided with a drain plug 5, and a multi-layer drain pipeline 9 is arranged in the drain plug 5; valve. The combined valve is a combination of an eccentric hemispherical valve or a butterfly valve or a ball valve 11 plus a piston valve 12; The water inlets of the bypass pipeline 3 and the drain pipeline 9 are all provided with a trash-stop net 10 . A stilling basin 14 is provided below the front end of the water outlet 13 of the drainage pipeline 9 , and the water outlet 13 of the drainage pipeline 9 is inclined downward facing the stilling basin 14 .

Example

Fig. 5 is a schematic diagram of the water flow channel on the dam body or the mountain. It can be seen from Fig. 5 that the existing dams are generally equipped with spillway 8, flood discharge tunnel 7, upper diversion tunnel 6 and diversion tunnel 1 and other water flow channels from top to bottom. . The method of this example is to utilize the diversion tunnel 1 at the bottom of the dam body or the mountain body to be transformed into a venting tunnel. To realize the purpose of emptying the water in the reservoir. The specific method is shown in Figure 1-4. A bypass pipeline 9 is installed outside the door slot 2 of the blocking gate 4. After the blocking gate 4 is lowered, a drain plug 5 is installed after the blocking gate 4. According to According to the requirements of the discharge flow, a corresponding number of several layers of discharge pipelines 9 are arranged from bottom to top in the discharge plug 5, and the discharge pipeline 9 is sequentially provided with a trash stop 10, an eccentric hemispherical valve or a butterfly valve or a ball valve 11 and Piston valve 12, the water outlet 13 of the piston valve 12 is arranged from bottom to top according to the angle gradually increasing with the horizontal line, and a stilling pool 14 is set below the water outlet 13 of the piston valve 12; 5 and the water retaining head during the installation and commissioning of the discharge pipeline 9 are controlled by the upper diversion tunnel 6, the flood discharge tunnel 7 or the spillway 8, and after the installation and commissioning of the discharge plug 5 and the valve related facilities of the discharge pipeline 9 are completed, After the bypass pipeline 3 is filled with hydraulic pressure, the blocking gate 2 can be lifted away, and the bypass pipeline 3 is U-shaped. Due to the combination of eccentric hemispherical valve or butterfly valve or ball valve 11 + piston valve 12, the water retaining head can reach 300 meters and above, and the dynamic water running head can reach 250 meters and above, so the reservoir can be emptied to below 200 meters to meet 300-meter-level dam safety venting requirements; in addition, the eccentric hemispherical valve or butterfly valve or ball valve 11 is used as an accident protection measure for the piston valve 12 (working valve). It can also provide conditions for the repair and maintenance of the drain pipe and piston valve; in addition, a bypass pipe 3 is provided outside the door slot 2, which can pass The bypass pipeline can fill the blockage gate with hydraulic pressure, so the blockage gate can also be used as the maintenance gate of the vent hole, providing maintenance conditions for the related facilities of the discharge plug and the valve of the discharge pipeline; finally, the vent facility is set at the diversion tunnel In the plug, the diversion hole is used to transform it into a vent hole, and there is no need to dig a new vent hole, which effectively saves investment. A multi-layer drainage pipeline 9 is arranged in the drainage plug from bottom to top, and each layer may have multiple drainage pipelines 9; a trash net 10, an eccentric hemispherical valve or a butterfly valve or a ball valve 11 are arranged in sequence in the drainage pipeline 9 according to the flow direction of the water And the piston valve 12; the water outlet 13 of the piston valve 12 is arranged from bottom to top according to the angle gradually increasing with the horizontal line, and a stilling pool 14 is set below the water outlet 13 of the piston valve 12; , eccentric hemispherical valve or butterfly valve or ball valve 11 and piston valve 12; and the water outlet 13 of the piston valve 12 is inclined downward.

The utility model has the following characteristics:

(1) The hydraulic pressure facilities for venting and bypass pipelines adopt the combination of eccentric hemispherical valve (or butterfly valve or ball valve) + piston valve. The head of eccentric hemispherical valve, butterfly valve, ball valve and piston valve can reach 300 meters and above The water running head can reach 250 meters and above, so the reservoir can be emptied to below 200 meters, which meets the technical requirements of 300-meter-level dam safety venting and super-high water head filling water pressure.

(2) The eccentric hemispherical valve or butterfly valve or ball valve is used as an accident protection measure for the piston valve (working valve). Conditions for overhaul and maintenance are provided.

(3) Bypass pipelines are installed inside the diversion hole blocking gate slot, and after the installation and commissioning of the drainage plug and drainage pipeline valve related facilities, the bypass pipeline can fill the diversion hole sealing gate Therefore, the plugging gate of the diversion tunnel can also be used as the maintenance gate of the vent hole, providing maintenance conditions for the drainage plug and related facilities of the drainage pipeline valve.

(4) The venting facility is set in the plug of the diversion tunnel, and the diversion hole is used to transform it into a vent hole, without excavating a new vent hole, which effectively saves investment.

(5) The front end of the drainage pipeline and the bypass pipeline is provided with a trash net to prevent large dirt from entering the pipeline.

(6) A stilling pool is installed under the pipeline at the outlet of the piston valve, and the pipeline at the outlet of the piston valve is arranged in such a way that the angle with the horizontal line gradually increases from bottom to top, so that the water flow at the outlet of the piston valve can impact from top to bottom and enhance the energy dissipation effect.

(7) The outlet of the pipeline behind the piston valve in the bypass pipeline is inclined downward, which can prevent the water flow from impacting the side wall of the cavern when the hydraulic pressure is filled.

Claims (4)

1. a high dam reservoir emptying device, including the diversion tunnel (1) being located at bottom dam body or massif, is provided with the closure gate (4) along gate slot (2) vertical sliding motion in diversion tunnel (1)；It is characterized in that: described gate slot (2) outside is provided with the bypass line (3) walking around gate slot (2), and the water inlet of bypass line (3) is positioned at gate slot upstream sidewall, and the outlet of bypass line (3) is positioned at the downstream sidewall of gate slot (2)；The outlet downstream of described bypass line (3) is provided with sluicing plug (5), is provided with multilamellar drain water circuit (9) in sluicing plug (5)；It is equipped with combined valve on bypass line (3) and drain water circuit (9).

High dam reservoir emptying device the most according to claim 1, it is characterised in that: described combined valve is the compound mode that eccentric half-ball valve or butterfly valve or ball valve (11) add piston valve (12)；Eccentric half-ball valve or butterfly valve or ball valve (11) are positioned on the inlet pipeline of piston valve (12).

High dam reservoir emptying device the most according to claim 1, it is characterised in that: the water inlet of described bypass line (3) and drain water circuit (9) is equipped with garbage barrier net (10).

High dam reservoir emptying device the most according to claim 1, it is characterised in that: being provided with stiling basin (14) below the front end of the outlet (13) of described drain water circuit (9), the outlet (13) of drain water circuit (9) is downward-sloping facing to stiling basin (14).