US 12,404,770 B2
Right-angle turning method for small-diameter TBM exploration adit excavation
Youlin Wang, Xi'an (CN); Yongshun Liu, Xi'an (CN); Junheng Cao, Xi'an (CN); Jian Jiao, Xi'an (CN); Shuwu Li, Xi'an (CN); Xiaoliang He, Xi'an (CN); Jian Bao, Xi'an (CN); Yue Zhao, Xi'an (CN); Zhongqiang Zhao, Xi'an (CN); Xiaoxia Xu, Xi'an (CN); Lei Feng, Xi'an (CN); Nan Chen, Xi'an (CN); Wei Liu, Xi'an (CN); and Zhixiang Zhao, Xi'an (CN)
Assigned to PowerChina Northwest Engineering Corporation Limited, Xi'an (CN)
Filed by PowerChina Northwest Engineering Corporation Limited, Xi'an (CN)
Filed on Jan. 17, 2023, as Appl. No. 18/097,876.
Claims priority of application No. 202211380634.5 (CN), filed on Nov. 4, 2022.
Prior Publication US 2024/0151143 A1, May 9, 2024
Int. Cl. E21D 9/10 (2006.01); E21D 9/00 (2006.01)
CPC E21D 9/008 (2016.01) [E21D 9/1093 (2013.01); E21D 9/10 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A right-angle turning method for small-diameter tunnel boring machine TBM′ exploration adit excavation, characterized by including the following steps: (1) according to a pre-designed direction and depth of a main exploration adit, adopting a small-diameter TBM for construction and excavation to a designated position, and then enabling the small-diameter TBM to continue to drive forward to a temporary parking place, and parking the small-diameter TBM there; (2) expanding and excavating a turning workspace at the right-angle turning position where a branch exploration adit is perpendicular to the main exploration adit, and assembling a rotary platform in the turning workspace; (3) retracting the small-diameter TBM and pulling the small-diameter TBM onto the rotary platform, rotating the rotary platform to make the small-diameter TBM move in a same direction as the branch exploration adit, and driving the small-diameter TBM to excavate the branch exploration adit to a the design depth; and (4) retracting the small-diameter TBM and pulling the small-diameter TBM onto the rotary platform after excavation of the branch exploration adit is completed, rotating the rotary platform to make the small-diameter TBM move in a same direction as the main exploration adit, and then moving the small-diameter TBM to an adit portal so as to complete excavation;
wherein horizontal jacks are installed on two sides of the rotary platform, and an end of each horizontal jack abuts against the turning workspace.