砂卵石河床锁扣钢管桩围堰设计施工研究

锁扣钢管桩围堰实施过程中存在施工工序转换频繁、荷载工况变化多样以及设计验算复杂等难题。为此,结合嘉陵江三桥主桥18#墩承台围堰施工,从围堰方案比选、锁口钢管桩围堰设计与复核、围堰施工等多方面进行论述和研究,总结了一套切实可行并适合砂卵石河床大型承台施工的“T-C”锁口钢管桩围堰设计和施工方法。结果表明,该设计和施工方法切合实际,能够更好地指导现场施工,过程中采取优化措施,进一步提高工效,解决了施工难题,对类似河床地质条件锁口钢围堰有一定借鉴作用。

Research on Design and Construction of Lock Button Steel Pipe Pile Cofferdam in Sandy Pebble Riverbed

During the construction of the lock button steel pipe pile cofferdam, there are many problems, such as frequent construction procedure conversion, various load cases, and complex design and calculation. Therefore, Based on the Jialing River Bridge 18# pier cofferdam construction, the scheme selection, esign and review of "T-C" lock button steel pile cofferdam, cofferdam construction, etc.,were discussed.and studied, and a set of design and construction method of "T-C" lock button steel pipe pile cofferdam which was practical and suitable for construction of dense sand and pebble riverbeds were summarized. The results show that the design and construction method in accordance with the actual, can better guide the construction, in the process of optimization measures, to further improve the work efficiency, solved the construction problems, which has the certain reference value for lock button steel pipe pile cofferdams in similar riverbed geological conditions.