Construction method for rapidly expanding and excavating large-section surge shaft through one-time drilling and blasting of ultra-deep hole

Abstract

The invention relates to the technical field of surge shaft construction, in particular to a construction method for rapidly expanding and excavating a large-section surge shaft through one-time drilling and blasting of an ultra-deep hole, which comprises the following steps of: S1, constructing a pressure regulating upper and lower construction channel to form a construction platform; s2, a raise boring machine is adopted for small pilot well construction, and a small pilot well with the diameter being 1.4 m is formed; s3, expanding excavation is conducted on the small pilot well through ultra-deep hole millisecond blasting in two procedures, and a slag slipping well with the diameter being 4.8 m is formed; s4, fore shaft concrete construction; and S5, expanding excavation is conducted on the shaft of the surge shaft through partition line production. The method has the characteristics of low construction safety risk, reasonable procedure arrangement and parallel construction of various operations, overcomes the defects of low tunneling and well expanding speed, low efficiency, high labor intensity, poor safety and the like of a common method, a cage hanging method and a cage climbing method, accelerates the well completion progress of the large-area vertical shaft, greatly reduces the construction difficulty and the construction cost, and ensures the engineering quality.

Description

Technical field [0001] The present invention relates to the technical field of pressure regulating well construction, and more particularly to a construction method of ultra-deep hole disposable drilled burst rapidly diffusing excavation of ultra-deep holes above the tunnel. Background technique [0002] In the water-saving hydropower station of the medium and high water head long distances, regulation (vertical) well is often required at the junction of the tunnel and the pressure pipe, which is used to reduce the water hammer effect and reduce the pressure of overcurrent components. The regulating well is a common hydraulic building. [0003] The pressure regulating well is generally large, the diameter is ≥15m, the well is ≥40m, the traditional large section regulator (vertical) well construction method is mostly a positive drill explosion method, and there is a lower work space, a positive direction can be used. Construction of the drill explosive method or the inverted drill...

AI Technical Summary

Problems solved by technology

[0007] 1. Construction personnel need to enter the guide hole, the implementation space is small, the environment is poor, and there is a high safety risk;

[0008] 2. Expand and excavate into slag wells in sections, with low efficiency, long construction period, and increased construction costs

Images