大桥钢结构复合长效防腐工程施工方案.doc

一、工程简介与技术要求
该桥采用中承式钢管混泥土拱桥，桥跨组合为（22+28+22）米（连续梁引
桥）+284 米（中承失拱主桥桥面长）+（6*22）米（连续梁引桥），桥梁全长
501 米，主孔为净跨260 米。
桥梁主拱采用斜拉扣挂悬臂拼装方法施工，全桥共分26 个拱肋节段，分
26 段吊装，每段吊重约57 吨，全部节段加工重量1455 吨。待钢管桁架拼装
合拢后，对主拱圈主肋钢管内灌注砼，形成钢管砼桁架。每个节段有主拱上
下弦管、平板、盖板、竖斜腹杆、肋间横撑主管和连接管等主要构件焊接而
成。其中，拱脚段上、下5 个节间范围为外包砼段。
该桥梁采用工厂制作、现场安装拼焊与防腐施工的方式进行制造，所以长
效防腐工程集中在工厂内完成。
由于该桥地处宜宾地区，横跨金沙江，因此该桥将长年处于较强的酸雨腐
蚀环境与潮湿环境中。为了保证该桥梁的设计使用寿命，必须对其进行长效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