洪洲大桥主跨100m钢管拱肋拼装技术

四川省洪洲公路大桥的主跨是１００ｍ的中承式集束钢管混凝土拱桥，拱高２５ｍ拱圈由两肋组成，每肋由三根变截面圆钢管构成，采取拱肋高空作业吊装拼装方案。本文对吊装方案作了检算，详述了吊装拼装的施工方法，并对吊装的定位控制和拱肋的线型控制等技术作了介绍。

ASSEMBLY TECHNIQUE OF STEEL TUBE ARCH RIBS FOR 100 m MAIN SPAN OF HONGZHOU MAJOR BRIDGE

The main span of the Hongzhou highway major bridge in Sichuan Province is a half-through composite steel tube concrete arch bridge with a length of 100 m and a height of 25 m.The arch circle consists of two ribs.Each rib was constructed by three circular steel tubes with variable cross-sections.The arch ribs were assembled by hoisting and fabricated in high-altitude.The paper makes calculation and check for the hoisting scheme,describes the construction method in detail,and introduces the techniques for its position control and the curvature control of the arch ribs.