大跨度满堂支架现浇混凝土拱桥支架拆除研究

Research on Bracket Removal of Large Span Cast-in-situ Concrete Arch Bridge by Full Space Support Method

在大跨度满堂支架现浇混凝土拱桥施工中,支架的拆除是施工技术关键所在。本文通过工程实例进行理论计算比较,研究了支架拆除顺序的不同对拱圈受力特性的影响,为了避免拱圈出现"M"型变形和由于拱脚不均匀受力引起的异形变形,结果引入"中心开花、三步两循环"式拆除方案,并成功有效地运用到了该工程实例中。

In the construction of large span cast-in-situ concrete arch bridge by full space support method, the removal of the support is a key to the construction technology. In this paper, through, theoretical calculation and comparison of engineering examples, the influence of different disassembly orders on the stress characteristics of the arch ring was studied. In order to avoid the ＂M＂ deformation on the arch ring and the abnormal deformation caused by the uneven force of the arch foot, the dismantling program of ＂center flowering, three-step two-cycle＂ was introduced, and it was successfully applied to the project example.