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跨度可达64m以上的鱼腹梁,通过对钢绞线施加预应力,给鱼腹梁支撑杆件产生了一个较大的反作用力,从而使作用于鱼腹梁围檩上的弯矩大大减少,提高了鱼腹梁的弯曲刚度。将预应力鱼腹梁通过专用结点与角撑或对撑梁连接在一起,便组成了深基坑的支护系统。在基坑开挖过程中,能确保支护结构的安全和控制周边土体的变形量。经基坑工程实践证明:该支护系统实现了深基坑支护技术的跨越式发展,不仅能大大降低基坑支护的造价30%以上、显著改善地下工程的施工作业条件,而且大大地减少了支护结构的安装、拆除、土方开挖及主体结构施工的造价及工期。
Fish webs spanning a span of 64 m or more exert a large reaction force on the web members of the fish web by prestressing the strand so that the bending moment acting on the perimeter of the fish webs is greatly reduced , Which improves the bending stiffness of fish webs. The prestressed fish belly beam through the special node and the gusset or girder connected together to form a deep foundation pit support system. During excavation of the foundation pit, the safety of the supporting structure and the deformation of the surrounding soil can be ensured. The practice of foundation pit engineering proves that this support system has realized the leap-forward development of the deep foundation pit support technology, which can not only greatly reduce the cost of foundation pit support by more than 30%, significantly improve the construction operation conditions of the underground project, Reduce the cost of construction, demolition, earth excavation and the main structure construction costs and construction period.