Complex stratum large-section tunnel over-break and under-break control device and method

Abstract

The invention relates to a complex stratum large-section tunnel over-excavation and under-excavation control device and method, and belongs to the technical field of tunnel excavation, the complex stratum large-section tunnel over-excavation and under-excavation control device comprises a rotary auger, and is characterized in that a base is arranged on the ground, a lifting plate is arranged on the base, and a lifting assembly used for driving the lifting plate to ascend and descend is arranged between the lifting plate and the base; an adjusting block is slidably connected to the lifting plate, a power assembly used for driving the adjusting block to move towards or away from the wall is arranged between the adjusting block and the lifting plate, a protection plate is rotatably connected to the adjusting block, a plurality of arc-shaped guide holes are formed in the protection plate, and the multiple rotary augers are rotatably connected into the guide holes. An adjusting mechanism used for driving the rotating auger to rotate and move in the guide hole is arranged between the protection plate and the rotating auger, and a rotating assembly used for driving the protection plate to rotate is arranged between the protection plate and the adjusting block. The method has the effect of improving the stability of the path during hole excavation so as to reduce the probability of over-excavation and under-excavation of the tunnel.

Description

technical field [0001] The present application relates to the technical field of tunnel excavation, and in particular, to a device and method for controlling over-under-excavation of large-section tunnels in complex strata. Background technique [0002] At present, the tunnel is over-excavated and under-excavated, that is, in the process of tunnel construction, the design excavation contour line of the tunnel is used as the benchmark. The part of the actual excavation section outside the benchmark line is called over-excavation, that is, the tunnel excavation contour line is larger than the tunnel design contour line. , the part within the baseline is called under-excavation, that is, the tunnel excavation contour line is smaller than the tunnel design contour line; tunnel over-under-excavation directly affects the construction safety, cost, and quality of the tunnel, and increases the difficulty of subsequent construction. [0003] The existing large-section tunnel excavati...

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Problems solved by technology

[0004] In view of the above-mentioned related technologies, the inventor believes that there is a defect that the artificially excavated hole path is easy to incline, which makes the explosion range of the blasting parts incline, resulting in an increased probability of over- and under-excavation during tunnel excavation

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