摘要
针对顺德水道特大桥20.5 m水深和软基的基础施工,采用了强化内支撑受力体系的钢板桩围堰,即框构式内围囹和网式支撑相结合的支撑体系,并对深水钢板桩自身围堰、围囹、封底混凝土和基坑稳定进行了设计计算。在施工中针对超长钢板桩和深水封底混凝土的施工难点,采取了先安装围囹后插打钢板桩及一些相应措施,同时对封底混凝土采用了分仓浇筑的方法。结论为:围堰的封底混凝土和基坑稳定均满足要求;计算得到的30 m长深水软基钢板桩围堰最大应力为142.9 MPa,最大变形为13.8 mm,均满足要求;施工安全顺利并且节约了成本、保证了工期。
Aiming at the foundation construction in 20.5 m-deep water for Shunde channel super large bridge, a steel slab pile cofferdam with strengthened internal support system was adopted including an internal enclosure framework and net-surpport system, and the stability of steel slab pile, enclosure framework, bottom sealing concrete and foundation pit was calculated. In view of the two construction difficulties of overlong steel slab piles and bottom sealing in deep water, the method of fixing enclosure framework first and then driving cofferdam piles was adopted, and the bottom sealing concrete was casted by bins. In conclusion, the the stability of slab pile and bottom sealing concrete met the requirements： the maximum stress in 30 m steel slab pile cofferdam was 142.9 MPa; the maximum deformation was only 13.8 mm. Besides, the construction process was safe, the cost was reasonable, the time limit for the project was ensured.
出处
《铁道标准设计》
北大核心
2011年第10期65-68,共4页
Railway Standard Design
关键词
公路桥
桥梁基础
钢板桩围堰
设计
施工
Highway bridge
Bridge foundation
Steel slab pile cofferdam
Design
Construction
