大橋鋼結(jié)構(gòu)復(fù)合長效防腐工程施工方案.doc

一、工程簡介與技術(shù)要求
該橋采用中承式鋼管混泥土拱橋，橋跨組合為（22+28+22）米（連續(xù)梁引
橋）+284 米（中承失拱主橋橋面長）+（6*22）米（連續(xù)梁引橋），橋梁全長
501 米，主孔為凈跨260 米。
橋梁主拱采用斜拉扣掛懸臂拼裝方法施工，全橋共分26 個拱肋節(jié)段，分
26 段吊裝，每段吊重約57 噸，全部節(jié)段加工重量1455 噸。待鋼管桁架拼裝
合攏后，對主拱圈主肋鋼管內(nèi)灌注砼，形成鋼管砼桁架。每個節(jié)段有主拱上
下弦管、平板、蓋板、豎斜腹桿、肋間橫撐主管和連接管等主要構(gòu)件焊接而
成。其中，拱腳段上、下5 個節(jié)間范圍為外包砼段。
該橋梁采用工廠制作、現(xiàn)場安裝拼焊與防腐施工的方式進(jìn)行制造，所以長
效防腐工程集中在工廠內(nèi)完成。
由于該橋地處宜賓地區(qū)，橫跨金沙江，因此該橋?qū)㈤L年處于較強(qiáng)的酸雨腐
蝕環(huán)境與潮濕環(huán)境中。為了保證該橋梁的設(shè)計(jì)使用壽命，必須對其進(jìn)行長效I. Introduction and technical requirements of engineering
The bridge used in Steel Pipe for mixed bridge, cross the bridge combination (22 +28 +22) m (beam lead
Bridge) +284 m (main bridge in the bearing failure arch bridge length) + (6 * 22) m (continuous beam approach spans), bridge length
501 m, the main hole for the clear span 260 meters.
The main arch bridge with cable-stayed cantilever erection method Fastening construction, full arch bridge is divided into 26 segments, divided
26 lifting, each weighing about 57 tons crane, all of the weight segments processed 1,455 tons. Steel truss to be assembled
After the closure of main arch ring main rib tube infusion of concrete, steel concrete truss form. Each segment has the main arch on
The next chord, flat, flat, vertical oblique belly bar, Transverse Brace competent and connecting pipe welding and other major components
Into. Among them, the arch foot segment, the next five sections of concrete between the range of outsourcing segment.
The bridge with factory production, welding and corrosion-site installation of manufactured construction methods, so long
Effective corrosion engineering focus within the factory.
As the bridge is located in the Yibin region, across the Jinsha River, the bridge will result in a stronger long rain rot
Eclipse environment and humid environment. In order to ensure the bridge's design life and must be long-lasting

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