Innovation Series: Advanced Science (ISSN 2938-9933)

Research on Key Block with Limited Pipe Segment Assembly Space

Baowei Qi, Peng Li

China Railway Engineering Equipment Group Co. Ltd, Henan, Zhengzhou, China

Abstract: In order to solve the problem of insufficient assembly space in mechanical connection channel and micro shield construction, a comparison of two solutions was first carried out, namely reducing the width of the segment ring and adjusting the center Angle, insertion Angle and joint Angle of the key block. The results show that adjusting the Angle of center Angle, insertion Angle and joint Angle of the key block is the most effective way to solve the problem of insufficient assembly space. By analyzing the geometric parameters of the segment and the assembly process, the functional relationship between the axial staggered distance of the key block and its partition Angle, insertion Angle, joint Angle, external radius and thickness under critical state and construction state is obtained. The axial staggered distance of the key block under construction state is positively correlated with the partition Angle, negatively correlated with the insertion Angle, negatively correlated with the joint Angle and positively correlated with the segment thickness. The optimal segment geometry design parameters were determined for the 4# connection channel lining segment of Guangzhou Metro Line 3, which provided a solution for segment design when segment assembly space was limited.

Keywords: Segment; Limited Space for Assembly; Key Block; Construction Gap

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