Construction method for prefabricating variable cross-section concrete box girder through long-line method

A construction method for prefabricating a variable cross-section concrete box girder through a long-line method comprises the following steps that S1, a foundation is treated and hardened; s2, layout of measurement control points; s3, manufacturing of a supporting system, including manufacturing of a supporting frame, manufacturing of a bottom edge frame and laying of a bottom die; the problems that a cast-in-place method is high in safety risk and poor in construction period control, and a short-line method is low in beam end prefabricating work efficiency, poor in precision and not suitable for internal prestress are solved, and the purposes of high efficiency and high quality of variable-cross-section continuous beam prefabricating construction are achieved. 一种变截面混凝土箱梁长线法预制施工方法，包括以下步骤：S1、地基处理及硬化；S2、测量控制点布设；S3、支撑系统制作，包括支撑架制作、底缘架制作以及铺设底模；S4、梁段预制，解决现浇法安全风险高、工期控制差和短线法预制梁端工效低、精度差和不适用于体内预应力的问题，达到变截面连续梁预制施工高效率、高质量的目的。