Construction method for excavating weak surrounding rock tunnel by hydraulic breaking hammer

Abstract

The invention discloses a construction method for excavating a weak surrounding rock tunnel by a hydraulic breaking hammer. The construction method comprises upper pilot tunnel excavation, deslagging, primary supporting, lower left pilot tunnel excavation, deslagging, primary supporting, lower right pilot tunnel excavation, shortcut backfilling, primary supporting, inverted arch and cavern excavation, deslagging, and construction of inverted arches, filling, small sidewalls, secondary lining and the like. The construction method adopts dynamic monitoring, performs scientific construction organization, avoids blasting explosive use, generates small amount of dust, has superhigh adaptability and good control performance for overexcavation and under-excavation, is small in surrounding rock disturbance, and is high in lining and building quality, stability, reliability and security degree; and mechanical characteristics of the surrounding rock are closer to a design condition.

Description

technical field [0001] The invention relates to a construction method for excavating tunnels in weak surrounding rocks, in particular to a construction method for excavating tunnels in weak surrounding rocks with a hydraulic breaker. Background technique [0002] As a key project, node project and difficult project of railway civil construction, tunnels have always been valued by the industry. Although the current tunnel construction theory is mature, technology and equipment are advanced, and experience is rich. However, according to different geological conditions, how to choose the appropriate construction method or the best construction method has always been an important and difficult point in the research of various construction units. [0003] Weak argillaceous sedimentary rocks belong to Class III and IV weak surrounding rocks. The strength of the surrounding rocks is not high, and they are easy to swell and weather when exposed to water or weathered to clay when exp...

AI Technical Summary

Problems solved by technology

[0005] The construction method of weak blasting and short excavation has the characteristics of many blasting times and high frequency, which directly leads to the limitation of drilling and blasting construction, which seriously affects the progress of the construction period.

Therefore, the traditional drilling and blasting method is not the optimal construction method regardless of the engineering structure, construction schedule and cost control

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