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U形梁是近几年来我国城市轨道交通采用的一种较为新颖的高架桥梁结构形式,但由于其U形薄壁开口结构形式、纤维混凝土材料及施工工艺的特殊性,外观质量缺陷问题屡见不鲜,且施工过程中较难预防控制,依托青岛蓝色硅谷城际轨道交通U形梁预制工程,介绍了U形梁预制施工过程中易出现的外观质量问题,分析总结了外观质量问题出现的原因,提出了原材料及坍落度控制、模板基面的处理、钢筋布置、浇筑顺序优化等方面的控制措施,取得了较好的应用效果,为今后U形梁的预制施工提供了可靠的工程实践经验。
U-shaped beam is a kind of novel viaduct structure adopted by urban rail transit in our country in recent years. However, due to the special structure of its U-shaped thin-walled open structure, fiber concrete material and construction technology, appearance quality defects are not uncommon. And the construction process is difficult to prevent and control. Based on the U-shaped beam prefabricated project of Qingdao Blue Silicon Valley intercity rail transit, the appearance quality problems prone to emerge during the prefabricated construction of U-shaped beam are introduced. The reasons for appearance quality problems are analyzed and summarized, The control measures of material and slump control, template base surface treatment, steel reinforcement arrangement and pouring sequence optimization are put forward, and the better application effect is obtained, which provides reliable engineering practice for the prefabricated construction of U-shaped beam in the future .