近年来,永久钢护筒大量应用于桩基工程中,在钢护筒长度较长的情况下,受运输吊装条件限制,需要将钢护筒分节段加工,运至钢护筒沉设现场对接。为保证焊接质量,施工过程中需克服大直径螺旋焊缝钢护筒加工精度不易控制,焊接作业环境恶劣等困难。本文以小浪底库区黄河特大桥永久钢护筒施工为背景,介绍野外作业环境下,大直径环氧涂层钢护筒现场对接焊缝质量保证措施。 In recent years, a large number of permanent steel casing used in pile foundation engineering, steel casing in the case of longer length, limited by the transport hoisting conditions, the need for steel casing sub-segment processing, transported to the steel casing sinking site Docking. In order to ensure the welding quality, it is difficult to control the machining accuracy of the large-diameter spiral welded steel casing in the construction process and the welding operation environment is harsh. In this paper, based on the construction of permanent steel casing of Yellow River Bridge in Xiaolangdi Reservoir Area, this paper introduces the quality assurance measures of on-site butt weld of large diameter epoxy coated steel casing in field work environment.