跨长深高速公路特大桥连续梁钢管拱施工技术研究

Research on the Construction Technology of Continuous Beam Steel Pipe Arch for the Super Large Bridge Across the Changshen Expressway

已有跨长深高速公路特大桥连续梁钢管拱施工技术存在加固结构性能不足的问题,导致加固结构在应对桥梁复杂受力情况时表现出较低承载能力和抗变形能力,桥梁在长期使用过程中出现变形、裂缝等。因此,以某公路桥梁工程为例,设计了跨长深高速公路特大桥连续梁钢管拱施工技术。首先,准备施工材料、调试施工设备并清理施工现场;然后,进行钢管拱脚预埋,包括钢管切割、固定、钢管柱支撑及支撑板加固;其次,确定吊装点,用起重机完成钢管拱吊装与合龙施工;再次,按照配合比制备混凝土并灌注。施工完成后,进行后期维护与处理。工程实例应用结果表明,该施工技术的水平位移和竖向位移量符合设计标准。

In view of the problem of insufficient reinforcement structural performance found in the construction technology of steel pipe arches for continuous beams of super large bridges spanning Changsha-Shenzhen highways,which results in a lower bearing capacity and deformation resistance of the reinforcement structure when dealing with complex stress situations of the bridge,as well as the deformation,cracks,and other issues experienced by the bridge during its long-term us,taking a certain highway bridge project as an example,the construction technology has been designed of continuous beam steel pipe arch for a super large bridge spanning Changsha-Shenzhen highways.Firstly,construction materials are prepared,construction equipment is debugged and the construction site is cleaned up;Secondly,the lifting point is determined and the lifting is completed by using a crane and the construction of the steel pipe arch is closed;Thirdly,concrete is prepared and poured according to the mixture ratio.After the construction is completed,post-maintenance and treatment are carried out.The application results of an engineering examples show that the horizontal and vertical displacement of the construction technology meet the design standards.