Research on key technologies of long distance undersea docking for super large diameter shield
Based on the project of Jintang undersea tunnel of Ningbo-Zhoushan railway,this article analyzes and researches the precise docking measurement method of 2 ultra long distance shields in the Jintang undersea tunnel,evaluates their measurement level and elevation error estimation,and combines with the geological conditions of the project section to study the selection strategy of the location of the docking point,the docking reinforcement method(reinforcement of the tunnel face,tube sheet and shield body)and the whole construction process,so as to ensure the safety of the construction of the docking point.The research results show that through theoretical calculations,the undersea docking accuracy of the 2 shields meets the specification requirements,and the use of over drilled holes for in-hole joint measurement can effectively control the docking measurement error during penetration,and can further improve the docking accuracy to ensure the smooth docking of the shield.At the same time,the selection of the location of the docking section,the analysis and evaluation of the stratum of the tunnel face and the research of the docking process can effectively ensure the safety of docking.
railwayundersea tunnelsuper large diameter shieldlong distancedocking
万方数据
维普
