铝合金人行天桥下部基础快速化施工研究

Research on Rapid Construction of Lower Foundation of Aluminum Alloy Footbridge

铝合金人行天桥经过最近10多年的发展,已逐渐成为市政工程人行天桥中的一个新的分支。目前已有的工程实践中,铝合金人行天桥上部结构的施工多采用工厂预制、现场拼装的方式,但下部基础仍采用传统的钻/挖孔桩或现浇扩大基础等,导致全桥现场施工周期依然较长,无法充分发挥和体现铝合金人行天桥快速化施工的优势。为了解决这一问题,结合铝合金人行天桥的特点,按两种跨径的桁架式铝合金人行天桥分别计算出下部基础的主要尺寸,提出采用扩大基础和桩基础对应的快速化施工方案,并对施工方案中的关键点提出具体措施。

After more than 10 years of development in recently,the aluminum alloy footbridges have gradually become a new branch of municipal engineering footbridges.In the existing engineering practices,the method of factory prefabrication and on-site assembling is mostly used for the construction of aluminum alloy footbridge superstructure.But the lower foundation is still used of the traditional drilling/digging piles or cast-in-place enlarged foundation,which leads to the long in-site construction period of the whole bridge,and is hard to fully play and reflect the advantages of the rapid construction of aluminum alloy footbridge.In order to solve this problem,combined with the characteristics of aluminum alloy footbridge,the main dimensions of the lower foundation are calculated according to the trussed aluminum alloy footbridges in two different spans.The corresponding rapid construction scheme of pile foundation and enlarged foundation is proposed,and the specific solutions for the key points in the construction scheme are put forward.