One-time excavation construction method for large-diameter large-depth pressure regulating well pilot shaft

Abstract

The invention discloses a one-time dig construction method for a major-diameter and full-depth pioneer well of a pressure regulation well, relates to the dig construction method for the pioneer well of the pressure regulation well. The invention adopts a from-up-to-bottom construction, and a from-bottom-to-up layering blasting method,is used in the rock breaking and fracture development areas of phyllite and clamp slate, and overcomes the shortcomings including the difficulty in the installation of a ventilation device, the difficulty in the setting-up of a construction platform, the problems of rock breaking and grave chip off-falling and the difficulty in safe protection in previous method. The one-time dig construction method has the advantages of reducing the construction cost, ensuring the construction safety, and being not used in other engineers at present.

Description

technical field [0001] The invention relates to a one-time excavation construction method for a surge well pilot well, in particular to a one-time excavation construction method for various types of large-diameter and large-depth surge well pilot wells in areas where rocks are broken, cracks are developed, dangerous, and the rock is phyllite. permanent excavation construction method. Background technique [0002] In phyllite areas with broken rocks and developed fissures, if conventional bottom-up layered pilot wells are used for excavation, not only the construction time is long, the construction cost is high, and there are great safety hazards. For example, the surge shaft of Chahanwusu Hydropower Station in Xinjiang is 71.6m deep, and the excavation diameter is 30m. It is difficult to install the device, it is difficult to set up the construction work platform, and the rock is broken, the pieces are seriously dropped, and the safety protection is difficult. Therefore, a ...

AI Technical Summary

Problems solved by technology

[0002] In the phyllite area with broken rocks and developed fissures, if the conventional bottom-up layered guide shaft is used for excavation, not only the construction time is long, the construction cost is high, and there are great safety hazards

For example, the surge shaft of Chahanwusu Hydropower Station in Xinjiang is 71.6m deep, and the excavation diameter is 30m. The device installation is difficult, the construction work platform is difficult to set up, and the rock is broken, the pieces are seriously dropped, and the safety protection is difficult. Therefore, a one-time excavation construction method that can be used from top to bottom is urgently needed.

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