Accurate excavation method for gentle slope inclined shaft

Abstract

The invention discloses an accurate excavation method for a gentle slope inclined shaft. The accurate excavation method comprises the steps that expanding excavation is carried out on a lower adit andan upper adit; a hole guiding and drilling are carried out by a directional drilling machine; a MWD inclinometer and an RMRS rotating magnetic field distance measuring system are adopted for drill bit positioning; hole guiding forward reaming is carried out by a raise boring machine; and then the raise boring machine is used for reverse expanding excavation of a pilot shaft, the pilot shaft is used for slag sliding and is parallel to the bottom of a designed contour line of an inclined shaft bottom plate, forward control of blasting excavation is carried out after the pilot shaft is communicated, and finally, slag sliding is completed. According to the accurate excavation method for the gentle slope inclined shaft, the method of directional drilling, inverse shaft expanding and forward blasting excavation is adopted for the 30-45-degree gentle slope inclined shaft, the pilot shaft is arranged on the inclined shaft bottom plate, the slagging-off efficiency is effectively improved, an included angle between an excavation tunnel face and the horizontal plane is 20-30 degrees, and blasting rock ballast is conveniently accumulated to the bottom and slides to the lower adit along the pilot shaft; the maximum blasting work amount is reduced through segmented blasting, and the rock ballast shaft blocking risk is reduced; forward one-time blasting excavation is carried out, and the blasting procedure construction time is shortened; and the construction efficiency is effectively improved, and the construction safety risk is reduced.

Description

technical field [0001] The invention belongs to the technical field of underground engineering construction, and relates to the excavation and construction technology of inclined wells in water conservancy and hydropower projects, in particular to a method for precise excavation of inclined wells with gentle slopes of 30° to 45°. Background technique [0002] In the construction of water conservancy and hydropower projects, the cable tunnel is not only a transmission channel but also an escape channel for personnel. Therefore, it is usually designed as a gentle slope inclined shaft. Cable shafts cannot meet the needs of escape routes. [0003] Usually the inclined well dip angle α is between 90° and 60°, and the raise drilling rig method should be used for construction. When it is lower than 45°, due to the influence of the natural angle of repose of the granular material (it is generally considered that the natural angle of repose of the granular material is 45°), if the r...

AI Technical Summary

Problems solved by technology

The present invention provides a method for forward excavation of anti-guided wells in the excavation of inclined wells with gentle slopes of 30° to 45°, which solves the difficulty of slag sliding in inclined wells with gentle slopes, improves the positioning control accuracy of guide holes in inclined wells with gentle slopes, and reduces the Construction safety risks, improving the efficiency of inclined shaft construction

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