Construction method for underground excavation tunnel advanced disintegration mechanical crushing

Abstract

The invention relates to the technical field of tunnel construction, in particular to a subsurface tunnel advanced disintegration mechanical crushing construction method which comprises the following steps: S1, construction preparation; s2, carrying out lofting; s3, splitting holes are formed; s4, blasting and crushing; s5, underbreak is checked; s6, primary support is constructed, a hard rock stratum of a tunnel face is disintegrated and crushed in advance by adopting conventional equipment such as a drilling machine and a blasting machine, so that the integrity of hard surrounding rock without development of a joint is damaged, the mechanical excavation difficulty is reduced in the excavation process, then excavation is performed by adopting a crushing head, disturbance to surrounding rock around an excavation section is small, and the excavation efficiency is improved. Adjacent construction, nearby buildings and traffic safety cannot be influenced; compared with excavation of a cantilever tunneling machine, the construction cost can be greatly reduced; compared with chiseling excavation with a single crushing head, the excavation feasibility of a hard rock stratum can be met, meanwhile, the construction efficiency is improved, construction resources are saved, and then the construction cost is reduced.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a construction method for advanced disintegration and mechanical crushing of undercut tunnels. Background technique [0002] Tunneling by mining method is the key and key project in the construction of rail transit, highway and railway. With the development of engineering construction and the advancement of science and technology, the mining method tunnel excavation method has been developed rapidly. The more commonly used excavation methods are drill and blast excavation and mechanical excavation. However, in the process of rail transit construction, shallow tunnels are more common, and often need to pass through municipal roads, underground pipelines, residential areas, workshops and other structures (buildings), which require surface settlement control and structure (building) protection. higher. Although the drilling and blasting method has strong adaptability t...

AI Technical Summary

Problems solved by technology

Although the drilling and blasting method has strong adaptability to geological conditions and low excavation cost, the blasting vibration during the construction process has a great impact on the surrounding environment, and rocks can only be broken by mechanical chiseling; existing mechanical excavation methods Including two methods of cantilever roadheader and crushing head chiseling; although the cantilever roadheader is suitable for relatively hard rock and has high construction efficiency, its equipment is expensive, the construction cost is large, and the dust is relatively large during the construction process; the crushing head chisel It is only effective for rocks with low hardness. For surrounding rocks with high hardness, pure crushing head chiseling and excavation construction will greatly restrict the construction progress and waste construction resources, thereby increasing construction costs.

Images