Hard rock tunnel construction method

A technology of tunnel construction and construction method, applied in the field of broken rock, can solve the problems of difficult rock-breaking drilling, low drilling efficiency, large under-excavation, etc., so as to reduce construction costs, avoid over-excavation and under-excavation, and ensure The effect of stability
CN110924972AInactive Publication Date: 2020-03-27CHINA RAILWAY CONSTR HEAVY IND
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
CHINA RAILWAY CONSTR HEAVY IND
Publication Date
2020-03-27
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention discloses a hard rock tunnel construction method. The hard rock tunnel construction method comprises the following steps that an arrangement mode of drill bits of an electric pulse rockdrill is designed according to the shape of a tunnel face needing to be drilled, wherein the high-voltage electrode and the low-voltage electrode of the drill bits have a preset distribution so as toperform rock break on the tunnel face through the pulse discharge effect of the high-voltage electrode and the low-voltage electrode, and the overall distribution area of the high-voltage electrode and the low-voltage electrode is larger than or equal to the cross-sectional area of a shell of the electric pulse rock drill; and the electric pulse rock drill is adopted to perform rock breaking construction on the tunnel face. When the tunnel face is subjected to rock breaking, outlines excavated by the drill bits can completely contain the shell of the electric pulse rock drill, thus over-breakand under-break can be avoided, and the stability of a tunnel supporting structure system is ensured. Meanwhile, due to the fact that the electric pulse rock drill performs rock breaking by utilizingthe pulse discharge effect, the drill bits do not need to rotate in the rock breaking process of the tunnel face, so that the wear amount of the drill bits is small, and the rock breaking efficiency is high.
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Description

technical field

[0001] The invention relates to the technical field of rock crushing, and more specifically, relates to a hard rock tunnel construction method. Background technique

[0002] In the construction of mining, hydropower, geological exploration, civil engineering, transportation and petroleum engineering, it usually involves the construction of breaking rocks, and the construction cost is directly affected by the efficiency of rock breaking. The rock breaking methods commonly used in the prior art include mechanical Rock breaking and dynamite blasting to break rock.

[0003] On the one hand, with the continuous deepening of the depth and breadth of human resource exploitation, the acquisition of crude oil, natural gas and geothermal energy in the future will require unconventional wells such as deep wells and ultra-deep wells, and traditional mechanical drilling methods are used to drill hard rocks. Or in ultra-deep wells, the drill bit is easy to wear, the drill...

Claims

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