Dongtouxia Cross-sea Bridge Unnavigable Hole Interception System Construction Technology Research

Based on the construction of Dongtouxia Cross-sea Bridge, this thesis is to do a research on the key technology of the interception system in non navigable hole. There are various technologies which are suitable for interception systems, including artificial island, anchor floating body, surrounded floating, group piles and shell cofferdam by sand. It is very meaningful for construction and operation to choose feasible construction methods and make improvement according to various site factors.Dongtouxia Cross-sea Bridge spans 2638.5m. Through analysis on bridges’ anti-collision measures both at home and abroad, this article confirms to adopt interception system technologies which are suitable for marine environment, including anti-collision pier, intercept chains, moored vessel anchor block integrated. All of these technologies are economic combining form. The author uses FEM, MSC/Patran, to simulate anti-collision attribute by anti-collision pier, Midas Civil to analyze the no-back-cover steel cofferdam under various conditions, to analyze the stress and simulate the collision of interception chains intercepting barge, and then conludes the cable sag of interception chains, which supports the engineering construction. At last, the author analyzes and elaborates the technologies of independent anti-collision, steel floating body and interception chains ect. in detail based on the above mentioned basis.