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| Research on the Key Technology of Small Diameter Shield Machine in Municipal Comprehensive Pipe Gallery |
| DUAN Ya – gang |
| (China Railway First Survey and Design Institute Group Ltd，Xi’an，Shaanxi 710043，China) |
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Abstract Abstract :Research purposes: Underground comprehensive pipe gallery，which can make use of tlie underground space efficiently，is the development direction of the city municipal pipeline in the future，but at present，the main method is the construction of open cut method，which has a great impact on the surrounding environment and high investment. With the increasingly widespread application of shield method in tunnel construction，the small diameter shield is extended to the construction of the underground pipe gallery，in reducing the difficulty and reducing the comprehensive investment has a considerable advantage，but must according to the characteristics of pipe gallery construction，for small diameter adaptability in shield tunnel segment the structure of the shield machine specifications，technical standards and other aspects，formed a set of suitable pipe gallery shield specifications. Research conclusions:( 1 ) The use of small diameter shield tunnel pipe gallery scheme is reasonable and feasilDle. (2) For general and special pipeline pipeline，we can determine the small inner diameter of the pipe gallery shield by 4 100 mm is reasonable. (3) Taking engineering geology and the surrounding environment to the project as the basis， we determine the spokes type earth pressure balance shield machine witli central support. (4) With shield wall thickness of 300 mm , 1 000 mm of the ring width , the bearing capacity and durability to meet the requirements at the same time , can adapt to the changing of tlie plane and vertical section line b；ter. (5 ) The research results can be used for comprehensive pipe gallery design as shield construction.
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Received: 27 February 2017
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2017, Vol. 34 
