Mechanical excavation method for hard-rock tunnel with medium-short length

Abstract

The invention discloses a mechanical excavation method for a hard-rock tunnel with the medium-short length and belongs to the field of construction methods. The mechanical excavation method comprises the steps that first, a plurality of parallel and vertical grooves are cut on a tunnel face in a tunnel profile at certain intervals, and each vertical groove enables rock on the two sides of the vertical groove to form a free face with the certain depth; and then crushing equipment is utilized to apply extruding stress to each free face of the two sides of the corresponding vertical groove, so that the rock of the two sides of the vertical grooves is crushed, and excavation of the tunnel is achieved. Compared with the prior art, the requirement of the construction, limited in blasting vibration, of the new built rock tunnel with the medium-short length for the aspects such as the economy, efficiency and the safety risk can be met; and meanwhile the construction efficiency is greatly improved compared with the prior art.

Description

technical field [0001] The invention belongs to the field of construction methods, and in particular relates to a mechanical excavation method for medium and short length hard rock tunnels. Background technique [0002] At present, there are two main types of tunnel construction methods in China. One is blasting construction, which is used in various tunnel projects. There are problems such as uncontrolled dimensions, dangerous construction, and excessive blasting vibration. The blasting vibration is limited during the construction of new short- and medium-length rock tunnels near or crossing or approaching high-speed railways and highways, and shallowly buried at the bottom of the water area, so blasting construction is not suitable. The other is mechanized construction, which is divided into shield tunneling method construction and cantilever tunnel boring machine construction. The former uses a shield machine for high construction costs and inconvenient transportation, a...

AI Technical Summary

Problems solved by technology

Although this method can effectively blast the hard rock in the tunnel, it needs to drill a large number of holes on the face of the tunnel, and the stripping of the rock needs to be carried out by a percussion hammer, and finally the rock is broken into smaller pieces. pieces of

This will consume a lot of energy, and its impact hammer also needs to be erected on a large excavator to bear the impact reaction force

At the same time, the impact process of the impact hammer has certain restrictions on the stripping speed of the rock.

[0008] The idea of ​​the above-mentioned several solutions is to divide the original block rock mass into relatively independent small pieces, and then use crushing devices (such as impact hammers, splitters, etc.) to further crush them, and then use crushed stones to The form is transported out, which leads to the restriction of its excavation efficiency

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