Non-blasting construction method of hard-rock tunnel in city

Abstract

The invention discloses a non-blasting construction method of a hard-rock tunnel in a city. The method comprises following steps: step 1, cutting an outer shell grove along the tunnel excavation contour in a horizontal direction with a chain saw cutter in order to form a continuously-enclosed free face; step 2, utilizing the chain saw cutter to inwardly cut the cutting groove in a horizontal direction according to the set trajectory on the tunnel face and dividing the tunnel face into multiple small blocks; step 3, utilizing a crush head to crush and remove fragmented rocks on the tunnel face. The method of utilizing the chain saw cutter and the crushing head is taken for mechanically excavation. Therefore, construction speed is quickened and input in tunneling cost and equipment is reduced. In the complex situation in the city, the construction method is applied to the hard-rock tunnel so that safety, reliably and efficiency are obtained; no influence is caused to the ambient environment and residents living in the ground; easy control of overbreak of the tunnel around is obtained; and the construction method is convenient and easy to promote.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, and is particularly suitable for non-explosive construction of urban hard rock tunnels. Background technique [0002] In recent years, with the accelerated pace of urbanization in the country, subway and highway projects in large and medium-sized cities in China are setting off a new round of construction climax. In the complex environment of the city, most of the newly-built tunnels are located in areas passing through existing roads, pipelines, and buildings (structures). Considering the impact of blasting construction on surface residents and buildings (structures), in order to ensure the safety and With social stability, non-explosive construction has become an indispensable construction method. [0003] For the non-explosive construction of hard rock tunnels, there are currently full-face tunnel boring machine (TBM) methods, cantilever boring machine methods, milling and excavat...

AI Technical Summary

Problems solved by technology

[0003] For the non-explosive construction of hard rock tunnels, there are currently full-face tunnel boring machine (TBM) methods, cantilever boring machine methods, milling and excavating machine methods, splitting methods, hydraulic impact hammer methods, static crushing methods, etc. Among them, the equipment investment of TBM method is relatively high. large, it is not economical for short-distance tunnels, and the other methods are applied to hard rock tunnels with strong surrounding rock strength and have low work efficiency.

Images