Page 54 - CO April 2017 Full Issue

COVER STORY Powered by INTERNATIONAL UPDATE CRCHI SPB Breaks through beneath the Yellow River The ongoing construction of Lanzhou Subway Line 1 draws people’s attention as a TBM is to tunnel through Yellow River. Te TBM used for Lanzhou Subway Line 1 is independently developed and manufactured by CRCHI. In December the TBM successfully broke through in the Yellow River, which tunneled from the Shen’an Bridge Station to the Lanzhou City University Station. It was a difcult breakthrough which creates a record. Te section between Shen’an Bridge Station and Lanzhou City University Station and the section between Lanzhou Customs Station and Matan Station are in the Yellow River, which were regarded as the most challenging sections by its construction difculty, high risk of safety and the most complex tunneling methodology. The content of pebble, with strength being 20MPa, reaches up to 81.95 per cent and loose pebble stratum has high water permeability, so accidents like riverbed collapse, water gushing-out and roof collapse may very likely to happen during TBM tunneling. As successful past national experiences in TBM through the Yangtze River, the Huai River, large lakes and coastal waters cannot be applied in this project, the construction of the TBM through the Yellow River is considered by specialists as “ a project starting at zero”. like quartz of large particle size and high parameter setting to ensure successful CRCHI set a new record in TBM tunneling permeability. construction, CRCHI has fnalised optimal by tunneling beneath the Yellow River, Having made deep research in TBM portfolio of TBM and provided three from which we learnt experiences in TBM selection, soil conditioning, allocation of customised SPBs for Lanzhou Subway Line construction under complex geologies cutter head and cutting tools, shield advance 1 with full-life cycle service team. CRCHI’s Double Shield TBM Creating a New Record in Daily Advance Rate and Monthly Advance rate in China China’s frst double shield TBM jointly where the tunnel length is 14.23 kilometers and Sinohydro Bureau 3rd Company developed and manufactured by CRCHI and the excavation diameter is 5.49 meters. tried their best to resume production as and Sinohydro Bureau 3rd Company has Letter of TBM Request was signed in August soon as they can. Te double shield TBM tunneled 4309 meters till 31st of December. of 2015. It took four months for TBM has performed very well in spite of many Daily advancing record: 43 meters, date: design and manufacture. Te machine was setbacks, gaining praises from construction 31st of December (day shif and night shif) accepted by customer in December of 2015 unit and specialists. monthly advancing record: 906.5 meters, and started to be assembled from January month: December. Tese were new records of 2016. It was the frst time for the TBM For more details contact: in daily advance rate and monthly advance that assembly and tunneling went on at the Email: ceo@friendsequipment.com / rate of the double shield TBM. same time due to limitation of construction crchi@vip.126.com Te double shield TBM is used in Lanzhou area. When geological disasters were met in Website: www.friendsequipment.com / New Water Source Construction Project June of 2016 during construction, CRCHI www.crchi.com 56 construction opportunities|aPrIL 2017