A support structure and construction method for tunnel entrance of circulating water system in power plant

Abstract

The invention relates to a supporting structure of a tunnel opening of a power plant circulating water system and a construction method. The supporting structure comprises a steel arch, wherein a part of the steel arch is arc-shaped. The supporting structure is characterized in that a plurality of cement stirring piles are arranged around the top and the two sides of the tunnel opening to form a cement grout stirring reinforcing area; the top of the tunnel opening is provided with a plurality of grouting anchor rods, and accordingly a grouting anchor rod reinforcing structure at the top of a tunnel is formed; a plurality of long tubes are arranged on the arc area of the top of the tunnel opening, and a long pipe shed structure is formed; a plurality of soil blocking cast-in-place piles are arranged on the two sides of a tunnel inlet channel outside the tunnel opening, and a soil blocking support of the tunnel inlet channel outside the tunnel opening is formed; the steel arch, the cement grout stirring reinforcing area, the grouting anchor rod reinforcing structure, the long pipe shed structure and the soil blocking support are connected into a whole through concrete, and accordingly the supporting structure of the tunnel opening of the power plant circulating water system is formed. Soft soil is dug in a certain rage of the tunnel opening, the soft soil in a limited range of the tunnel opening is reinforced in special technical measures, and a safe tunnel opening structure is formed; the position of the tunnel opening does not need to be adjusted, the route of the tunnel does not need to be changed, and the supporting structure and the construction method have the advantages that project investment is little and design and construction are convenient to carry out.

Description

technical field [0001] The invention relates to a support structure and a construction method for a tunnel entrance of a circulating water system of a power plant, which are suitable for the circulating water system of a coastal thermal power plant or a nuclear power plant. The utility model belongs to the technical field of circulating water systems of power plants. Background technique [0002] At present, in coastal thermal power plants or nuclear power plant projects, the circulating water system generally adopts a direct-flow water supply system, that is, water is taken from the sea, and then discharged back to the sea after the cold and heat energy exchange cycle of the power plant. Due to the characteristics of the topographic and geological conditions of the plant site, as well as considering factors such as technical and economic conditions, the water intake or drainage channels of many power plant projects need to be realized by tunnels passing through the mountain...

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Problems solved by technology

[0006] One of the purposes of the present invention is to overcome the disadvantages of large engineering investment, increased land acquisition area, and increased operating costs of power plants in the scheme of avoiding soft soil sections and adjusting the position of the tunnel entrance that is often used at the entrance of the soft soil foundation tunnel, or to excavate the soft soil The tunnel entrance position scheme for soil adjustment has the disadvantages of high difficulty and high cost in the diversion of roads above the entrance slope or the relocation of buildings and structures. A support structure for the tunnel entrance of the power plant circulating water system is proposed, which has the advantages of low investment, convenient construction, and good protection for the surrounding areas of the tunnel. Slopes, buildings and structures have no impact on the environment, etc.

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