Ultra-large-diameter soft soil stratum ultra-deep buried normal-pressure cutter-changing slurry-gas balance shield tunneling machine

Abstract

The invention relates to an ultra-large-diameter soft soil stratum ultra-deep buried normal-pressure cutter-changing slurry-gas balance shield tunneling machine. The shield tunneling machine comprisesa shield body, a cutter head rotatably arranged at the front end of the shield body and a profiling cutter arranged in the cutter head, wherein the profiling cutter comprises a cutter box arranged onthe cutter head, a telescopic oil cylinder, a cutter bar and a cutter bit, and the telescopic oil cylinder, the cutter bar and the cutter bit are sequentially arranged in the cutter box; the first end of the cutter bar is connected to the telescopic oil cylinder, the telescopic oil cylinder is fixed to the first side of the cutter box, the second side of the cutter box is provided with an opening, and the cutter bit is fixed to the second end of the cutter bar; and the outer side of the cutter bar is provided with a spring in a sleeved mode, the two ends of the spring abut against an abuttingplate arranged on the outer side of the cutter bar and an abutting table formed on the inner side of the cutter box respectively, and the spring applies working load to the cutter bar when the cutterbit rotates to the bottom position along with the cutter head so as to prevent the cutter bit from extending out of the opening in the second side of the cutter box. According to the ultra-large-diameter soft soil stratum ultra-deep buried normal-pressure cutter-changing slurry-gas balance shield tunneling machine, by calculating the working load of the spring, it can be effectively avoided thatthe cutter bit extends out of the cutter box when rotating to the bottom position of the cutter head along with the cutter head when the profiling cutter does not need to extend out.

Description

technical field [0001] The invention relates to the field of shield tunneling construction engineering, in particular to an ultra-deep-buried atmospheric pressure cutter-changing mud-water-air balance shield tunneling machine in a super-large-diameter soft soil stratum. Background technique [0002] For today's underground space construction, in most cases, shield machine construction is curved construction, which requires turning and deviation correction. This requires installing a profiling knife on the cutterhead structure to perform radial over-excavation on the soil. When turning in the tunnel, the working conditions are complex and the force is large, and the stability requirements for the profiling knife are high. In combination with the conditions of super large diameter, soft soil stratum and ultra-deep burial, the stability requirements for the profiling knife are even stricter. up. [0003] During construction, the profiling knife can be radially extended and re...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects of the prior art, to provide an ultra-deep burial of ultra-large-diameter soft-soil stratum, and to change the knife mud water-air balance shield machine, so as to solve the problem that the existing profiling knife is not stable enough and is prone to over-excavation phenomenon. The problems that lead to kowtow phenomenon of the whole shield machine and increase the amount of grouting during construction and thus increase the construction cost

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