Construction method capable of causing pilot hole to pass through large-area drifting sand layer through shaft counter-drilling method

Abstract

The invention discloses a construction method capable of causing a pilot hole to pass through a large-area drifting sand layer through a shaft counter-drilling method. The construction method comprises the following steps of: a: making a construction preparation; b: installing a raise boring machine; and c: carrying out pilot hole drilling construction. In a pilot hole drilling construction process, adopted materials are conventional, and price is low, meanwhile, additionally purchased instruments are not required, little special equipment is adopted, in addition, an integral operation methodis convenient and flexible, construction expenses and machinery equipment input are reduced, engineering construction cost is greatly lowered, and construction safety is guaranteed while an economic benefit is good. An influence on the masses in a surrounding area is reduced through a convenient operation, and surrounding environment and underground water are protected since the adopted materialsare free from environmental hazard substances. The technology has high work efficiency, is high in operability, is safe and environmentally, has good quality, is easy in promotion, saves investments,increases a new option for a disposal method capable of causing the pilot hole to pass through the drifting sand layer, prompts a development of a counter-drilling expanding excavation technology, andhas a great potential social benefit.

Description

technical field [0001] The invention relates to the technical field of shaft raising method construction, in particular to a construction method in which the pilot hole of the shaft raising method is over a large area of ​​quicksand layer. Background technique [0002] In recent years, the number of tunnel construction in my country has continued to be high, and the length of tunnel construction has surpassed the number of construction. "Long, large, multiple, and deep" has become the future development trend of tunnel construction. Among them, in order to solve the ventilation problem in extra-long highway tunnels, ventilation shafts are generally installed in the middle of the tunnel. The traditional tunnel shaft construction mainly adopts the full-section excavation method from top to bottom, supplemented by drilling and blasting methods to increase the diameter of the shaft and improve the efficiency. Low, pollute the environment, and personal safety cannot be guaranteed...

AI Technical Summary

Problems solved by technology

However, during the construction of the shaft pilot hole through the flowing sand layer with water, there will be phenomena such as hole wall collapse and buried drilling, which will lead to slow construction and high safety risks.

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