复杂地下空间环境下城市桥梁基础设计研究

Research on Urban Bridge Foundation Design in Complex Underground Space Environment

摘要:

城市道路地下分布着各种基础设施及建筑结构，这些构筑物形成了复杂的城市地下空间环境。作为重要的基础设施，城市桥梁基础也参与地下空间环境中。桥梁基础设计及施工均会受到地下临近构筑物的影响。结合西安凤城八路-太华路立交工程，探讨了桥梁基础避让地铁、排水干管等地下构筑物时采取特殊的结构设计和地基处理措施，采用预应力异形承台设计、旋喷桩地基加固设计和设置永久桩基钢护筒等措施。经研究分析，以上措施能够很好地解决桥梁下部基础设计难题，不仅节约工程造价，还具有一定的创新性，项目建成后运营良好，取得较好的社会效益和经济效益。

Abstract:

Various infrastructure and building structures are distributed under the urban roads,These structures form a complex urban underground space environment. As an important infrastructure, urban bridge foundations also participate in the underground space environment. The design and construction of bridge foundations will be affected by nearby structures underground. This article combines the Xi"an Fengcheng 8th Road Taihua Road Interchange Project. Explored special structural design and foundation treatment measures for bridge foundations to avoid underground structures such as subways and drainage mains. The main measures include the design of prestressed irregular bearing platforms, the reinforcement design of rotary jet grouting pile foundations, and the installation of permanent pile foundation steel casings. After research and analysis, the above measures can effectively solve the design problems of the lower foundation of the bridge. Not only does it save engineering costs, but it also has a certain degree of innovation. After the project is completed, it operates well and achieves good social and economic benefits.