COMPLEX FOR TUNNEL EXCAVATION IN WEAK GROUND Russian patent published in 2007 - IPC E21D9/11 

FIELD: mining, particularly to excavate Metro tunnels in instable rock with ground structure keeping in undamaged state.

SUBSTANCE: complex comprises working tool made as removable faceplate 10 with cutters 11 arranged over faceplate surface, protective shell made as cantilever 14 fixedly secured to faceplate 10 perimeter, working tool advancing mechanism 13 and block laying means. Removable faceplate 10 is provided with windows 17 for preliminary face weakening and cut rock removal and with two hydraulic cylinders for faceplate 10 retention. The hydraulic cylinders have extendible stops 15 and is fastened to rotary lever 5 installed on load-bearing frame 2 of block laying means connected to advancing mechanism 13. One end of rotary lever 5 is provided with grip 6 for tubing 7, which may be substituted for hydraulic hammer 8.

EFFECT: increased tunnel excavation rate and operational safety, decreased time of prior tunnel lining, improved tunnel shaping accuracy and increased advancing speed.

7 dwg