公开(公告)号：US20240076985A1

公开(公告)日：2024-03-07

申请号：US18322101

申请日：2023-05-23

申请人： Huating Coal Group Co., Ltd.

发明人： Xuandong LI ,  Fuqi WANG ,  Zhixiang LI ,  Jun WU ,  Chao GAO ,  Bin TIAN ,  Jiangning WANG ,  Yuanda REN ,  Dongdong WANG ,  Longfei WANG ,  Hua ZHANG ,  Jianhua CHEN ,  Zhenghu MO ,  Xiaogang LI

IPC分类号： E21D15/60

CPC分类号： E21D15/60

摘要： For the problem of difficult roof anchor withdrawal at the end of a working face, a static crushing directional anchor withdrawal method at the end of a large-mining-height working face is provided. The method includes the following steps: designing key parameters of boreholes for static crushing, including a borehole position, a spacing between boreholes, a borehole depth, and a borehole diameter at the end of a working face; then determining parameters of a static crushing agent grouting technology device for the construction of a static crushing process; and carrying out an anchor withdrawal operation at the end. The method provided by the present disclosure can solve the problem of difficult roof anchor withdrawal at the end of a working face, is beneficial to shortening the hanging roof distance of the working face, preventing the sudden caving of hanging roofs at the upper and lower corners of the working face and the potential safety hazard caused by gas overrun, and guaranteeing the normal use of the mining roadway. The method used in the present disclosure has the advantages of no vibration, no flying stone, no shock wave, no noise, no toxic gas pollution and the like.