墩底对顶施工V型刚构桥的支座和承台设置

Installation of Supports and Base Slabs of V- shaped Rigid Frame Bridge by Opposite Jacking Construction at Bottom of Piers

上海轨道交通16号线泐马河桥为主跨145 m的V型墩连续刚构桥。该桥采用独特的施工工艺,在中跨合龙后,对V型墩底依靠承台对上部结构施加一对相向的水平顶推力,为主梁结构提供一定的预压力和预拱度。由于采用此工艺,V型墩底及承台之间的连接构造与以往V型刚构桥明显不同。为确保该桥梁在顶推合龙时的结构响应符合设计预想,采用了较为特殊的支座与承台结构形式。对该支座进行了相关试验,确保施工效果符合设计要求,并介绍承台的结构形式以及支座设计与试验过程。实际施工结果表明这些方法是可行的,可为类似工程提供借鉴。

Lema River Bridge of Shanghai Metro Line 16 is a V- shaped pier continuous rigid frame bridge with the main span of 145 m. The bridge uses a unique construction technology, to which a pair of opposite horizontal thrust is applied at the bottom of the piers against the base slab after the closure of the main span.By this technology, a certain pre pressure and pre camber is provided for the main beam structure. As a result of this process, the links structure between V- shaped pier bottom and base slab is very different from the former V- shaped rigid frame bridges. To ensure that the structure response of the bridge is in line with design expectations during the launching and closure, the more special structure forms of supports and base slabs are adopted. The test of supports has been carried out so that the construction effect is ensured to comply with the design requirement. This article describes the structural form of base slabs, and the design and test process of supports. The results of actual construction prove that these methods are feasible, which can be referenced for the similar projects.