Large-section steep hill long inclined shaft high-precision pilot shaft excavating construction method and system and application

Abstract

The invention belongs to the technical filed of water conservancy and hydropower underground projects, and discloses a large-section steep hill long inclined shaft high-precision pilot shaft excavating construction method and system and application. A full-section drilling and blasting method is adopted for excavating to form an upper adit and a lower adit, and the upper adit and the lower adit serve as a construction channel; after the upper adit is formed, the upper adit is used as the construction channel, and a directional drilling machine is mounted and debugged, and carries out forward drilling to excavate a high-precision pilot hole with the diameter of 216 mm; after the high-precision pilot hole with the diameter of 216 mm is formed in the second step, a hole is drilled in a directional manner and connects with the lower adit, a drill pipe is pulled out, a drill bit is replaced to process the pilot hole into a hole of the diameter of 250 mm in a brushing manner, and the directional drilling machine is dismounted; the above work is finished, a raise boring machine is mounted and debugged, and forward drilling is carried out to excavate a drill hole of the diameter of 270 mm;and after work in the fourth step is finished, the lower portion of the raise boring machine is provided with an expanding excavation drill bit, and the pilot hole is subjected to expanding excavation from bottom to top to form a pilot shaft with the diameter of 2.2 m. The mechanization level is high, and the construction efficiency is high.

Description

technical field [0001] The invention belongs to the technical field of water conservancy and hydropower underground engineering, and in particular relates to a construction method, system and application of a high-precision guide well excavation method for a large-section steep-slope long-inclined well. Background technique [0002] At present, the closest existing technology: steep dip angle, large section, and long inclined shaft has the characteristics of high construction precision, difficult construction, high safety risk, and complicated technology. The diameter of the inclined shaft guide shaft is generally 2-3m. The function is to solve the slag channel for excavating blasting slag in the whole inclined shaft. There are two main excavation methods for pilot wells in long deviated shafts: tank climbing method and raise drilling rig drilling method. Pilot shaft construction is the key to determining the success or failure of inclined shaft excavation. [0003] In the...

AI Technical Summary

Problems solved by technology

The invention solves the problems of high technical difficulty such as low construction efficiency, high safety risk, and large deflection rate of the guide shaft in the excavation of the guide shaft of the large-section steep slope and long inclined shaft.

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