Construction Process and Precision Control of Middle Partition Wall in Large Diameter Shield Tunnel
This paper examined the operational process and error analysis of the middle partition wall of large diameter shield tunnel,with a particular focus on the third bid project of Shanghai Suburban Railway Airport Link Line.Firstly,the overall construction process of the middle partition wall was outlined according to the preliminary design scheme and the construction site situation.Secondly,the installation method of the middle partition wall was determined,and the corresponding control measures were put forward for the installation accuracy of the middle partition wall.This not only improves the construction efficiency of the middle partition wall,but also has the characteristics of safety and stability,low cost and easy promotion.Finally,some of the midline deviation measurement data were selected for analysis of the type A uncertainty of the accuracy control effect when the middle partition wall was installed.The results show that,the rotation centre of the middle partition wall is 4 034 mm from the bottom of the middle partition wall,and the lifting height of the middle partition wall is 1 838 mm.The midline deviation data of the 995th,1 000th and 1 005th rings are evaluated by class A uncertainty.The measurement results are 1.05,2.05 and 3.06 mm,respectively.The number of detections is 20 times,the degree of freedom is 19,and the confidence probability is 95%,which proves a high measurement accuracy.
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