沉管隧道整体式最终接头新工法的几个特殊结构问题

Immersed tunnel several special structural issues of closure joint new construction methods

为了降低工程综合风险,港珠澳大桥沉管隧道的最终接头用了整体式可逆主动止水的新工法。在方案发展的过程遇到了若干特殊问题。文章旨在讨论其中四个关键的结构问题:小梁的结构分析、超短距大压缩量预应力张拉、结合腔的进气与排水、以及钢混三明治组合结构垮塌分析。

To reduce the overall project risk,a new method,namely the integrity reversible positive-waterstop closure joint,was developed to construct the closure joint. Special issues were raised in developing this solution.This paper aims to discuss four structural issues,including the structural analysis of small frame,prestressing of very short distance and very large compression,air intake and water outlet of connection chamber,and collapse analysis of SCS sandwich composite structure.