Ultra-deep hole pre-grouting pipe for crack-developed surrounding rock and grouting method

• Main Authors: GENG MINMIN, ZHAO GUOZHEN, GONG PENG, JIANG ZHONGXI, WANG KUN, MA ZHANGUO, ZHANG XIUQUAN, ZHANG FAN
• Format: Patent
• Language: Chinese; English
• Published: 22.08.2012
• Subjects: EARTH DRILLING; FIXED CONSTRUCTIONS; GALLERIES; LARGE UNDERGROUND CHAMBERS; MINING; SHAFTS; TUNNELS

Provided are an ultra-deep hole pre-grouting pipe for crack-developed surrounding rock and a grouting method. The ultra-deep hole pre-grouting pipe comprises a plurality of sections of grouting pipes continuously placed in a drill hole, a plurality of cross-shaped slurry-overflowing holes are drilled on the grouting pipes at intervals, the joints of the grouting pipes are provided with slurry blocking devices, and exposed ends of the grouting pipes are provided with integrated controllers. Blocking pieces are embedded in the slurry-overflowing holes and provided with blocking piece switches controlled by the integrated controllers. Each slurry blocking device comprises a slurry blocking pipe, the middle of each slurry blocking pipe is provided with a slurry controlling plate fixed through a rotating shaft and a torsion spring, the middle of each slurry blocking pipe is provided with a slurry blocking sleeve, a pipe wall of each slurry blocking pipe contacted with the slurry blocking sleeve is provided with co