关于温塘跨线桥现浇箱梁支架预压的设计意见

一、概述
本院在2001年4月送呈业主的施工蓝图中已就莞深高速公路三期工程现浇预应力及普通钢筋砼箱梁的支架预压问题进行了阐述，要求施工单位在搭设好上部结构施工支架后，对支架进行加载预压，以保证上部箱梁构造在卸架后能获得满意的设计外形。
对于预压加载的方式，国内桥梁建设中已有相当成熟的经验，综合来看，主要有流体加载和固体加载两大类，对于如温塘跨线桥这种跨数多、总长度大的箱梁结构，在满足设计要求的前提下，应当优先考虑选用施工方便、周转快的预压方法，结合施工现场的具体条件，如采用围池注水加载的方法预压应是可行的。
箱梁施工支架围池注水预压的工艺流程如下：

Cast on wentang overpass support the views of pre-press design

I. Introduction
Hospital in April 2001 sent to the owners of the construction blueprint has three projects on the Dongguan-Shenzhen Expressway, Prestressed Concrete and Reinforced Concrete Box Girder bracket described preloading issues require the construction unit in the erection of superstructure construction of good stent, the stent pre-loaded pressure to ensure that the upper box frame construction in the discharge can be satisfied after the design of shape.
Way for pre-loaded pressure, domestic bridge construction experience has been very mature, comprehensive point of view, mainly fluid and solid loading loading two categories, such as wentang overpass for a few more this cross, the total length of the box large structure to meet the design requirements of the premise priority should be given choice convenient for construction, working Kuai's pre-Ya Fang Fa, combined with construction site specific conditions such as around pools with water injection method of pre-loading pressure should be feasible of.
Box construction scaffolding around pool water injection pre-pressure process is as follows: