对空间扭曲截面钢桁梁安装技术的探讨1

摘要:

本钢结构桥梁工程由主桥和引桥两大部分组成，主桥一跨跨越繁忙内河河道，与之斜交；主桥结构设计为空间扭曲截面钢桁梁，引桥设计为简支钢箱梁。项目施工过程中充分考虑桥位可用空间，尽量减小对航道的影响，岸边位置采用汽车吊吊装，航道位置采用整体大节段浮吊吊装的方式，各施工区域互不干涉，可多点同时施工。主桥边跨部分采用卧拼桁架片体吊装，中跨部分采用立拼整体大节段吊装的施工工艺，并针对性设计了辅助工装，保证了主桁梁空间扭曲截面的安装精度和质量。项目施工经验可用于指导类似桥梁的施工。

Abstract:

This steel structure bridge project consists of the main bridge and the approach bridge. One span of the main bridge spans the busy inland river channel and crosses it obliquely; the main bridge structure is designed as a spatially twisted section steel truss girder, and the approach bridge is designed as a simply supported steel box beam. During the construction of the project, the available space of the bridge position was fully considered to minimize the impact on the waterway. The shore position was hoisted by a truck crane, and the waterway position was hoisted by an overall large-section floating crane. The construction areas do not interfere with each other, and multiple points can be used. Construction at the same time. The side spans of the main bridge are hoisted by horizontally spliced ??truss pieces, and the mid-span parts are hoisted by vertical splicing as a whole and large sections. Auxiliary tooling is designed specifically to ensure the installation accuracy and quality of the spatially twisted sections of the main truss girder. Project construction experience can be used to guide the construction of similar bridges.