Construction method of excavating weak surrounding rock tunnel with hydraulic breaker

Abstract

The invention discloses an excavation construction method for a tunnel with weak surrounding rock, which comprises excavation of an upper pilot tunnel, slag removal, and initial branching, excavation, slag removal, and initial branching of an upper left pilot tunnel, excavation of a right lower pilot tunnel, backfilling of a sidewalk, and initial branching, Excavation and slag discharge of inverted arches and caverns, construction of inverted arches, filling, small side walls, secondary lining, etc. The hydraulic breaking hammer excavation construction method for weak surrounding rock tunnels of the present invention adopts dynamic monitoring, scientifically organizes construction, avoids the use of explosives, produces less dust, has strong adaptability, and has good control performance for over-excavation and under-excavation. The disturbance is small, so that the mechanical properties of the surrounding rock are closer to the design situation, the lining quality is high, and the stability, reliability and safety are high.

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

[0004] Most countries in the world have very strict control over explosives, and the approval procedures are complicated. Moreover, when the construction is adjacent to the urban area, the impact of blasting construction on nearby residents must also be considered, and an application must be submitted to the relevant department in advance.

Moreover, under the strict political control, the market supply of explosives is small, which directly leads to the continuous rise of the price of engineering explosives in some areas, and there are often situations where prices are not available.

[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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