钢护筒复合桩基承载能力研究

Study on Bearing Capacity of Steel Casing Composite Pile Foundations

摘要:

钢护筒常用于水中桩基施工的临时措施，作为永久构造并考虑参与桩基受力，研究钢护筒复合桩基的承载能力。以某座黄河桥为例，对比计算钢护筒复合桩基和钢筋混凝土桩基在地震作用下的承载能力，结果表明：考虑钢护筒参与受力后，桩基承载能力显著提升，有效提升了高地震区桥梁桩基的抗震设计。为提高钢护筒复合桩基与承台连接的可靠性，设计了一种钢护筒与承台的刚性锚固构造。

Abstract:

Steel casing is commonly used as a temporary measure for the construction of underwater pile foundation. It is designed as a permanent structure and considered to participate in pile foundation stress. The bearing capacity of steel casing composite pile foundation is studied. Taking a Yellow River bridge as an example， the bearing capacity of steel casing composite pile foundation and reinforced concrete pile foundation under earthquake action is compared and calculated. The results show that after considering the steel casing participating in the stress， the bearing capacity of pile foundation is significantly improved， which effectively solves the seismic design of bridge pile foundation in high earthquake areas. In order to improve the reliability of the connection between the steel casing composite pile foundation and the base slab， a rigid anchoring structure between the steel casing and the base slab is designed.