现浇箱梁钢筋骨架整体绑扎关键技术

钱有伟，王杰

中国中铁四局集团第二工程有限公司，江苏 苏州  215131

摘要：为解决移动模架现浇箱梁施工中人工现场逐根绑扎钢筋施工周期长、施工质量不稳定的问题，采用钢筋骨架整体绑扎模式，通过有限元模型对钢筋骨架吊装施工过程进行力学分析，确保钢筋骨架各施工阶段的变形、应力均在设计允许范围内；研发1套双幅并制箱梁钢筋整体绑扎的胎具和吊具，解决钢筋骨架绑扎、存储、吊装、纵移、入模等技术难题，并应用于温州市域铁路灵昆特大桥项目中。工程实践表明：移动模架现浇箱梁整体绑扎施工质量较好，移动模架的循环时间和投入数量均减少，移动模架的使用效率显著提高，施工成本降低，施工现场干净、整洁、有序。钢筋骨架整体绑扎模式有助于实现海洋环境下桥梁陆地化、工厂化、标准化的施工理念，经济效益和社会效益较高。

关键词：移动模架；钢筋骨架整体绑扎；有限元分析；施工技术;箱梁桥

Integral binding key technology of reinforcement frame ofcast-in-situ box girder

QIAN Youwei, WANG Jie

The Second Engineering Co., Ltd. of CTCE Group，Suzhou 215131, China

Abstract:In order to solve the problem of long construction time and unstable construction quality of manually binding reinforcement root-by-root in the construction of mobile formwork cast-in-situ box girder, the overall binding mode of reinforcement skeleton is adopted, and the mechanical analysis of reinforcement skeleton hoisting construction process is conducted through finite element model to ensure that the deformation and stress of reinforcement skeleton in each construction stage are within the allowable range of design. A set of jigs and slings for integral binding of twinframe parallel box girder reinforcement is developed to solve technical problems such as binding, storage, hoisting, longitudinal movement, and formwork insertion of reinforcement skeleton. The technology is applied to the Lingkun Bridge Project of Wenzhou City Railway. The engineering practice shows that, the overall binding construction quality of the mobile formwork cast-in-situ box girder is good, and the cycle time and input quantity of the mobile formwork are reduced, and the service efficiency of the mobile formwork is significantly improved, and the construction cost is reduced, and the construction site is clean, tidy and orderly. It can realize the construction concept of land, factory and standardization of bridges in the marine environment are realized with high economic and social benefits.

Keywords:mobile formwork; overall binding of reinforcement skeleton; finite element analysis; construction technology; box girder bridge