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| Design and Discussion on Disassembled Scheme In - tunnel of West Qinling Tunnel |
| FENG Huanhuan,LI Huai |
| (State Key Laboratory of Shield Machine and Boring Technology，Zhengzliou，Henan 450001，China) |
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Abstract Research purposes： West Qinling Tunnel of Lanzhou - Chongqing Railway has some characteristics of long lines，high construction difficult and new construction technology，whose total length is about 28. 23 km. In order to better solve the difficult problems of disassembled scheme in - tunnel of West Qinling Tunnel，in view of the drawback to research on TBM disassembled technology in - tunnel，the key technologies were fully researched and analyzed from the two aspects of TBM disassembled preparation scheme and system demount methods，providing reference for this and similar to project construction. Research conclusions ：( 1) When the scheme of TBM disassembled in - tunnel was designed，we should take full account of demount chamber design，construction equipment configuration，facilities cleaning and step mechanism installation. The work of host section disassembly was in strict accordance with the order of 1： bridge，support system， shield， cutterhead，main bearing and mounting rack. (3 ) Identification methods of mechanical components，electric system and hydraulic system were summarized. (4 ) Width of demount chamber is smaller than actual demand， 0. 5 meter of allowance need to be increased per side. After the disassembly cleaning of cutterliead was completed，a comprehensive inspection was taken，and the special schemes for the maintenance and storage of main bearing were formulated. (5)The research results can provide guidance for TBM disassembled in - tunnel of this and similar projects in the future， to ensure construction safety and high efficiency.
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Received: 25 August 2015
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2016, Vol. 33 
