US 12,404,772 B2
Zonal bolt-grouting support device and method for cataclastic rock mass large deformation of high-stress tunnel
Guojin Zhu, Yunnan (CN); Pengzhi Pan, Yunnan (CN); Xuexing Cao, Yunnan (CN); Yangyi Zhou, Yunnan (CN); Zhaofeng Wang, Yunnan (CN); Shijie Yang, Yunnan (CN); Xufeng Liu, Yunnan (CN); Huyue Zhan, Yunnan (CN); and Fengqiong Li, Yunnan (CN)
Assigned to POWERCHINA Kunming Engineering Corporation Limited, Kunming (CN); Huaneng Lancang River Hydropower Inc, Kunming (CN); and Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan (CN)
Filed by POWERCHINA Kunming Engineering Corporation Limited, Yunnan (CN); Huaneng Lancang River Hydropower Inc, Yunnan (CN); and Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Hubei (CN)
Filed on Oct. 30, 2023, as Appl. No. 18/497,882.
Application 18/497,882 is a continuation of application No. PCT/CN2023/123484, filed on Oct. 9, 2023.
Claims priority of application No. 202211339372.8 (CN), filed on Oct. 29, 2022.
Prior Publication US 2024/0141785 A1, May 2, 2024
Int. Cl. E21D 20/02 (2006.01)
CPC E21D 20/021 (2013.01) [E21D 20/028 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A zonal bolt-grouting support device for cataclastic rock mass large deformation of a high-stress tunnel, comprising:
a high-strength prestressed anchor bolt (1);
an expansion anchoring agent (2);
a decoupling element (3);
a grouting steel pipe; and
a reverse anti-skid device (7);
wherein the expansion anchoring agent (2) is placed in a head, a middle, and a tail of the anchor bolt (1) respectively; the decoupling element (3) is continuously wound in the middle of the anchor bolt (1) and passes through the expansion anchoring agent (2) at the middle of the anchor bolt (1), to prevent the anchor bolt from being broken when a surrounding rock has a large deformation; the grouting steel pipe is arranged side by side with the anchor bolt (1) in a drill hole;
the grouting steel pipe comprises a shallow grouting steel pipe (4) and a deep grouting steel pipe (5), both of which insert the expansion anchoring agent (2); a grouting stop valve is installed at an end of the grouting steel pipe, and 3 to 5 grouting holes (6) are drilled in a middle and a tail of the grouting steel pipe; and
the reverse anti-skid device (7) is arranged at the tail of the anchor bolt (1).