超大跨度双跨机库局部加强及提升施工技术研究
Study on Partial Reinforcement and Lifting Construction Technology for a Double Large-Span Hangar
大跨度维修机库屋盖钢结构施工技术中,“地面原位拼装+两阶段累积提升”是一种经济、高效的施工方法。目前行业内大跨度双跨机库均采用“三边支撑柱顶设置提升架+大门开口边设置数量不等的临时提升塔架”的技术路线,临时塔架对地基承载力要求高,而填海造陆地区的地基承载力低,塔架底部地基处理难度大,原有技术路线无法满足现场施工要求,故迫切需要研发一种新的施工技术,来解决软弱地基区域机库钢屋盖的安装。基于厦门翔安太古2号维修机库项目的实践,行业内首次提出和采用了“大门桁架局部加强及其无临时支撑提升”的施工技术,该技术通过对大门桁架结构布置进行调整,实现了大门开口边不再设置临时提升塔架,利用现有结构柱就能进行提升施工,使施工态与设计态结构边界尽可能一致,从而将施工过程对结构应力的影响降至最小。通过全过程施工模拟分析,对钢屋盖进行拼装预变形和对约3.6%的杆件截面进行微调。通过采用新的施工技术,解决了软弱地基地区机库施工地基处理困难的问题,施工方式相较于传统工艺更为简单,具有良好的经济效益,可为类似工程施工提供参考。
During the construction process of the steel roof structure of a large-span maintenance hangar, in-situ assembly on the ground with two-stage cumulative lifting is an economical and efficient construction method. Nowadays, the double large-span span hangar in the field adopts the technology of installing lifting frames on the top of the three support columns and temporary lifting towers at the gate opening. Temporary tower structures require high foundation bearing capacity, while reclaimed land typically has low bearing capacity. The foundation construction for the tower is relatively difficult, and the original technology cannot meet the on-site construction requirements. Therefore, a new construction technology is needed to solve the installation of the steel roof of the hangar in soft foundation areas. Based on the practice of the Xiamen Xiang'an Taigu 2 Maintenance Hangar Project, a technique involving partial strengthening of the gate truss and non-temporary-support lifting was proposed and adopted for the first time. This technology adjusts the layout of the gate truss structure to eliminate the need for temporary lifting towers at the gate opening, and uses existing structural columns for lifting. This makes the boundary conditions in the construction state as consistent as possible with those in the design state, thereby minimizing the impact of the construction process on structural stress. Through the simulation analysis of the whole construction process, the steel roof assembly and pre-deformation measurement were conducted, and the sections of about 3.6% of the members were fine tuned. Through new construction techniques, the problem of foundation treatment for hangar construction in soft foundation areas can be solved. This type of construction method is simpler than traditional techniques and has good economic benefits, which can provide a reference for similar engineering construction.
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