急弯深槽山区性河流栈桥方案研究

Scheme Research of the Trestle Bridge in a Sharp Turn Mountain River in the Deep Groove

栈桥位于急弯深槽山区性河流中,其特点是在汛期水位标高迅速增长,漂浮物多,水流速度大,河床覆盖层薄,基岩中度风化,这些水文地质特点导致栈桥横向受力大,并且栈桥基础"生根"较难。结合马岩锦江特大桥施工实践,对其栈桥方案进行比选,最终采用搭建施工平台进行引孔的施工方案;同时对栈桥的横向受力进行了详细的分析,对制动墩方案进行了优化,指出了栈桥钢管桩施工的关键环节,对于类似的栈桥工程设计和施工具有借鉴意义。

The trestle bridge was located in a sharp turn mountain river in the deep groove,where the water level in flood season will be rapid growth,have more floater,big water flow velocity,thin overburden layers of riverbed,and moderately weathered bedrock,the hydrogeological conditions lead to larger pier transverse force and difficult foundation construction. Combined with the construction practice of Mayan Jinjiang Bridge,two trestle schemes were proposed in this paper,the construction scheme of building construction platform for the guide hole was finally adopted. Meanwhile,the transverse stress of the trestle bridge was discussed in detail,the optimization scheme of braking pier was carried out,and then the key link in construction of steel tube pier was pointed out,which could provide a reference for the design and construction of similar bridge engineering.