關于溫塘跨線橋現澆箱梁支架預壓的設計意見.rar

關于溫塘跨線橋現澆箱梁支架預壓的設計意見

一、概述
本院在2001年4月送呈業主的施工藍圖中已就莞深高速公路三期工程現澆預應力及普通鋼筋砼箱梁的支架預壓問題進行了闡述，要求施工單位在搭設好上部結構施工支架后，對支架進行加載預壓，以保證上部箱梁構造在卸架后能獲得滿意的設計外形。
對于預壓加載的方式，國內橋梁建設中已有相當成熟的經驗，綜合來看，主要有流體加載和固體加載兩大類，對于如溫塘跨線橋這種跨數多、總長度大的箱梁結構，在滿足設計要求的前提下，應當優先考慮選用施工方便、周轉快的預壓方法，結合施工現場的具體條件，如采用圍池注水加載的方法預壓應是可行的。
箱梁施工支架圍池注水預壓的工藝流程如下：

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:

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