TBM pilot tunnel expansion digging method for 20km double-line double-cavity ultra-long tunnel construction

The invention provides a TBM pilot tunnel enlarging excavation method which is adopted in 20km dual-line dual-tunnel super-long tunnel construction, belonging to the building technical field of road, railway or bridge. The method is that a. two TBMs respectively with the diameters of 4.2m and 3.5m a...

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Bibliographic Details
Main Authors MAO DONGHUI, SUN JIANPING, WANG XINXIAN, WU HUANTONG, CHAI YONGMO, ZHANG YAFENG, LEI SHENGXIANG, LI XIANGHAI, YOU ZUQUN
Format Patent
LanguageChinese
English
Published 16.07.2008
Subjects
EARTH DRILLING
FIXED CONSTRUCTIONS
GALLERIES
LARGE UNDERGROUND CHAMBERS
MINING
SHAFTS
TUNNELS
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Summary:The invention provides a TBM pilot tunnel enlarging excavation method which is adopted in 20km dual-line dual-tunnel super-long tunnel construction, belonging to the building technical field of road, railway or bridge. The method is that a. two TBMs respectively with the diameters of 4.2m and 3.5m are adopted so as to excavate from the bottom center of the lower-end tunnel opening of the two parallel tunnels to the high-end direction of the tunnel to form two pivot tunnels A and B; b. enlarged excavation and lining operation are firstly carried out in the B pivot tunnel which passes through a tunnel-typed ventilation air exchange system and a communicated track delivering system which consist of the A pivot tunnel and a transverse passage; c. after the pivot tunnel A and the pivot tunnel B are interpenetrated, only two coal faces at the inlet and the outlet of A line are arranged; d. after the enlarged excavation in B line is completely achieved, 8-10 coal faces are opened to achieve the enlarged excavation o
Bibliography:Application Number: CN2008150360