Method for constructing pressure pipeline and dam heavy curtain of head underground powerhouse

Abstract

The invention discloses a method for constructing a pressure pipeline and a dam heavy curtain of a head underground powerhouse. The expanding excavation is carried out on a pressure pipeline cave body near a seepage-proofing line of the dam heavy curtain, and first-stage concrete is poured through the expanding excavation space. After the first-stage concrete is poured, a plurality of rows of circumferential radiation heavy curtain grouting holes are formed around a cave of the first-stage concrete for carrying out the heavy curtain grouting. After the circumferential radiation heavy curtain grouting construction is finished, the common subsequent operation of the pressure pipeline can be carried out, any construction interference cannot be caused for the dam heavy curtain grouting, and the seepage-proofing quality of the dam heavy curtain is not affected. The seepage-proofing quality of a dam is guaranteed, and the construction interference, caused by a traditional scheme, between the dam heavy curtain and the pressure pipeline is effectively avoided.

Description

technical field [0001] The invention belongs to the field of hydropower engineering, and in particular relates to a method for grouting construction of pressure pipes and dam curtains of a head-type underground powerhouse in hydropower engineering. Background technique [0002] At present, in the planning and design of underground powerhouses of hydropower stations, due to the relatively low cost of the head-type underground powerhouses, they are widely used in large and medium-sized hydropower projects. In the layout plan of the head-type underground powerhouse, the curtain grouting of the dam (cement grout, cement mortar, chemical grout, etc., determined according to the needs) often interferes with the construction of the pressure pipeline. Generally, there are two treatment methods as follows: The first method The first method is to carry out the dam curtain grouting at the adjacent parts of the penstock, and then excavate the penstock; the second method is to first exca...

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Problems solved by technology

Since the dams of large and medium-sized hydropower projects and the underground water diversion power generation system belong to two different main bid sections, if the first method is adopted, it will have a great impact on the construction progress of the pressure pipeline, which will further restrict the construction progress of the underground powerhouse ; If the second treatment method is adopted, it will have a great impact on the construction progress of the dam curtain grouting, and there is a seepage control "blind area" at the bottom of the pressure pipe, and there may be potential leakage channels

For general large and medium-sized hydropower projects, dam curtain grouting and water diversion power generation systems are key lines, so in the traditional treatment methods, no matter which method is used, it will bring adverse effects

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