阅读说明：本技术 一种长距离大流量供水管线减压装置及其施工方法 (Pressure reducing device for long-distance large-flow water supply pipeline and construction method of pressure reducing device ) 是由 孙卫 湛正刚 慕洪友 程瑞林 鲍伟 孔宇田 张恒 陈润泽 于 2020-06-16 设计创作，主要内容包括：本发明公开了一种长距离大流量供水管线减压装置及其施工方法,包括用于供水的有压管道,在该有压管道的末端设有消能电站,在消能电站的末端连接设有尾水池,在尾水池末端设置吸水坑；所述吸水坑连接有一根供水管,该供水管设置有伸缩节和流量控制阀。本发明可以对高水头压力管道进行有效减压,不受水头限制,相对传统的减压措施,管理方便,安全性高,其最大优点是减压的同时,可带来发电效益,经济性可观,可在水利水电工程技术领域广泛推广应用。(The invention discloses a pressure reducing device of a long-distance large-flow water supply pipeline and a construction method thereof, and the pressure reducing device comprises a pressure pipeline for supplying water, wherein an energy dissipation power station is arranged at the tail end of the pressure pipeline, a tail water pool is connected and arranged at the tail end of the energy dissipation power station, and a water suction pit is arranged at the tail end of the tail water pool; the water suction pit is connected with a water supply pipe which is provided with an expansion joint and a flow control valve. The invention can effectively reduce the pressure of the high-water-head pressure pipeline without being limited by the water head, has convenient management and high safety compared with the traditional pressure reduction measures, has the biggest advantage of reducing the pressure, can bring the power generation benefit, has considerable economical efficiency, and can be widely popularized and applied in the technical field of water conservancy and hydropower engineering.)

1. The utility model provides a large-traffic water supply line pressure relief device of long distance which characterized in that: the energy dissipation device comprises a pressure pipeline (1) for supplying water, wherein an energy dissipation power station (2) is arranged at the tail end of the pressure pipeline (1), a tail water pool (3) is connected to the tail end of the energy dissipation power station (2), and a water absorption pit (4) is arranged at the tail end of the tail water pool (3); the water suction pit (4) is connected with a water supply pipe (5), and the water supply pipe (5) is provided with an expansion joint (6) and a flow control valve (7).

2. The long reach, high flow water supply line pressure relief device of claim 1, wherein: the energy dissipation power station (2) is a water turbine power station.

3. A construction method of the pressure reducing device of the long-distance large-flow water supply pipeline according to claim 1 or 2, characterized by comprising the following steps:

1) selecting a proper position of the energy dissipation power station (2) in a pipeline of the pressure pipeline (1) according to geological and topographic conditions;

2) building a plant (13) of the energy dissipation power station (2), and installing a water turbine (14);

3) a tail water pool (3) is built at the tail end of a plant (13) of the energy dissipation power station (2);

4) excavating a water absorption pit (4) at the tail end of the tail water pool (3);

5) a water supply pipe (5) is arranged at the water suction pit (4);

6) the water supply pipe (5) is respectively provided with a telescopic joint (6) and a flow control valve (7).

Technical Field

The invention relates to a pressure reducing device for a long-distance large-flow water supply pipeline and a construction method of the pressure reducing device, and belongs to the technical field of pressure reducing devices.

Background

In recent years, long-distance large-flow water supply projects are increasing, and due to large flow, long distance and large fall, the flow speed in a pipe is reduced rapidly because a valve is closed suddenly in the using process, so that the pressure bearing capacity of the pipe is reduced suddenly, increased or comes and goes periodically, and the like, and large water hammer pressure is generated, so that potential safety hazards are brought to the safety of the water supply projects, and the safety problem of the long-distance large-flow pressure pipe is increasingly prominent.

There are two types of pressure reduction measures commonly used in the current project. One is decompression by a decompression valve, and the other is decompression by a decompression pool. The pressure reduction of the pressure reducing valve is realized by carrying out sectional treatment on the water conveying pipeline according to the height of the terrain, the requirement of a water supply area on pressure, the pressure bearing capacity of a pipeline and the like of the terrain, then the pressure reducing valve is arranged at different height positions, and the pressure value behind the pressure reducing valve is set according to the pressure reducing ratio which can be reached by the pressure reducing valve so as to ensure that the pressure behind the pressure reducing valve is within the range of the pressure bearing capacity of the pipeline. And the other pressure reducing tank is arranged, and the pressure reducing tanks are arranged at different height positions according to the total topographic fall of the head point and the tail point of the water delivery project in a pressure reducing mode, and the water level of the pressure reducing tanks is taken as a starting point so as to supply water to a lower pipeline conveniently.

Two types of pressure reduction measures commonly used in the above projects need to be provided with pressure reduction facilities in sections to implement sectional pressure reduction and energy dissipation, so that a long pipeline is required to be divided into a plurality of discontinuous pipelines, and the tail part of each pipeline is provided with a gate valve and an energy dissipation facility. However, both of the two measures have the defects of large engineering quantity, high investment, inconvenient management and the like, and are not suitable for energy dissipation and pressure reduction of ultra-high water heads.

Disclosure of Invention

The invention aims to provide a pressure reducing device for a long-distance large-flow water supply pipeline and a construction method thereof aiming at the defects in the prior art.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a pressure reducing device of a long-distance large-flow water supply pipeline comprises a pressure pipeline for supplying water, wherein an energy dissipation power station is arranged at the tail end of the pressure pipeline, a tail water pool is connected to the tail end of the energy dissipation power station, and a water suction pit is arranged at the tail end of the tail water pool; the water suction pit is connected with a water supply pipe which is provided with an expansion joint and a flow control valve.

Wherein, the energy dissipation power station is a water turbine power station.

The construction method of the pressure reducing device for the long-distance large-flow water supply pipeline comprises the following steps:

1) selecting a proper energy dissipation power station position in a pressure pipeline according to geological and topographic conditions;

2) constructing an energy dissipation power station plant, and installing a water turbine;

3) constructing a tail water pool at the tail end of an energy dissipation power station plant;

4) excavating a water absorption pit at the tail end of the tail water pool;

5) a water supply pipe is arranged at the water absorption pit;

6) the water supply pipe is respectively provided with an expansion joint and a flow control valve.

Compared with the prior art, the invention can effectively reduce the pressure of the high-water-head pressure pipeline without being limited by a water head, has the advantages of convenient management and high safety compared with the traditional pressure reduction measures, can bring power generation benefits while reducing the pressure, has considerable economical efficiency and can be widely popularized and applied in the technical field of water conservancy and hydropower engineering.

Drawings

FIG. 1 is a first cross-sectional view of a pressure reducing device for a long-distance, high-flow water supply line according to the present invention;

FIG. 2 is a sectional view of a pressure reducing device of a long-distance large-flow water supply pipeline according to the present invention;

FIG. 3 is an overall layout of a pressure reducing device for a long-distance large-flow water supply pipeline according to the present invention.

Description of reference numerals: 1-pressure pipeline, 2-energy dissipation power station, 3-tail water pool, 4-water absorption pit, 5-water supply pipe, 6-expansion joint, 7-flow control valve, 8-water inlet, 9-vent hole, 10-tunnel, 11-surge shaft, 12-auxiliary factory building, 13-factory building, 14-water turbine, 15-water collecting well, 16-original ground line and 17-water plant.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

As shown in fig. 1-3, the pressure reducing device structure for a long-distance large-flow water supply pipeline comprises an energy dissipation power station 2 arranged at the tail end of a pressure pipeline 1, wherein the pressure pipeline 1 is connected in a tunnel 10, the front end of the tunnel 10 is provided with a water inlet 8 and a vent hole 9, and a pressure regulating well 11 is arranged at a proper position on an original site line 16; the energy dissipation power station 2 comprises a sub-plant 12, a plant 13, a water turbine 14 and a water collection well 15. The tail end of the energy dissipation power station 2 is connected with a tail water pool 3, the tail end of the tail water pool 3 is provided with a water absorption pit 4, the water absorption pit 4 is connected with a water supply pipe 5, and the water supply pipe 5 is provided with an expansion joint 6 and a flow control valve 7. The water supply pipe 5 is terminated to a water plant 17.

Wherein the energy dissipation power station 2 is a water turbine power station. The distance from the tail water pool 3 to the water absorption pit 4 is determined by combining the actual topography. The size of the water absorption pit 4 is determined according to the flow requirement.

The construction method is carried out according to the following steps in the construction process:

1) and selecting a proper position of the energy dissipation power station 2 in the pipeline of the pressure pipeline 1 according to geological and topographic conditions.

2) Building a plant 13 of the energy dissipation power station 2, and installing a water turbine 14;

3) a tail water pool 3 is built at the tail end of a plant 13 of the energy dissipation power station 2;

4) excavating a water absorption pit 4 at the tail end of the tail water pool 3;

5) a water supply pipe 5 is arranged at the water suction pit 4;

6) the water supply pipe 5 is provided with a telescopic joint 6 and a flow control valve 7.

Of course, the above is only a specific application example of the present invention, and other embodiments of the present invention are also within the scope of the present invention.