跨海大桥桥墩基础耐久性设计与施工技术

Durability Design and Construction Technology of Pier Foundation of Bay Bridge

桩基结构耐久性是影响跨海大桥运营安全和使用寿命的决定性因素,通过分析影响跨海大桥桩基耐久性的主要因素,结合东海大桥工程海域水动力及地质环境特征,针对钢管桩、PHC管桩、钻孔桩的工程特点,提出采用高耐久性混凝土、增加保护层厚度、牺牲阳极的阴极保护等系列有效的工程措施。结果表明:该措施满足跨海大桥混凝土耐久性设计使用年限要求。

Considering the durability of the pile foundation is crucial to the operation safety and service life of the bay bridge, factors that affect the durability were analyzed. Combined with the hydrodynamic and geological characteristics of the Donghai Bridge, as well as the features of steel pipe piles, PHC pipe piles and bored piles, a series of measures were proposed, including using highly durable concrete, increasing the thickness of the protective layer and sacrificing the cathodic protection of the anode. The results show that the measures guarantee the durability of concrete meets the requirements for service life.