连续钢桁梁双向全悬拼工法

ERECTING 2×64 m CONTINUOUS STEEL TRUSS BY BIDIRECTIONAL COMPLETE CANTILEVER ASSEMBLY METHOD

隧道工程局第一工程处承建的南昆铁路横口3#大桥、八渡4#大桥主跨均为2×64m上承式连续钢桁梁，借鉴预应力钢筋混凝土连续梁悬臂灌筑的方法，采用双向对称全悬臂拼装架设．获得成功。该工法机械设备投入少，拼装工作量减少一半，增加一个工作面，施工周期短，社会、经济效益显著。

The Henkou and Badu major bridges were constructed by the First Engineering Department of the Tunnel Engineering Bureau of MOR. The No. 3 span of Henkou Bridge and the No. 4 span of Badu Bridge are the main spans both being the deck bridge with 2×64 m continuous sted truss.Tak ing the balanced cantilever erection method for the continuous prestressed reinforced concrete beam as reference, the bidirectional symmetric complete cantilever assembly method was applied and the suc cessful results had been obtained. By using this erection method,there were following advantages: the invested machineries being minimum,assembly works decreasing one half,increasing another working area,shortening the construction period, and having significant social and economical beliefits.