Construction conversion technology of double side walls of single-hole large section tunnels

• Main Authors: ZHAO CAI, GUO ZHEN, ZHANG ZHIQIANG, XU SHAOHONG, XIAO FEI, SHI LEI, ZHANG YONG, FENG DEDING, DONG HANJUN, PENG ZHEN, HE ZUHAO, LI XIANGYANG, SHI FULONG, LIU YI, KANG XIAOPING
• Format: Patent
• Language: Chinese; English
• Published: 19.01.2018
• Subjects: EARTH DRILLING; FIXED CONSTRUCTIONS; GALLERIES; LARGE UNDERGROUND CHAMBERS; MINING; SHAFTS; TUNNELS

The invention discloses a construction conversion technology of double side walls of single-hole large section tunnels. The method comprises following steps: 1. a left middle partition wall of a double-side-wall tunnel moves to the left and a temporary invert gradually moves downward to be respectively coincident with a middle partition wall and a temporary invert of CRD; 2. excavation and supportare carried out for the upper steps and the lower steps of drift heading at two sides of the two side walls and the upper step in the middle, and a middle lower step core soil is reserved; 3. small section step method of excavation and support for the upper step and the lower step is carried out; 4. excavation and support are carried out for the upper step at two sides of the middle section CRD and the lower step at the right side; 5. excavation and support are carried out for the lower step at the middle of the double side walls and for the lower step at right side of the CRD. The inventionuses the method of double-