移动装配式模架在地铁站洞桩法施工中的应用
张洪军1冯利华1周翠红2吴玉鹏2,3陈佳蕊2
Application of Movable Assembled Formwork in Construction of Metro Station by PBA
ZHANG HongjunFENG LihuaZHOU CuihongWU YupengCHEN Jiarui
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作者信息:1.1. 中铁一局集团第二工程有限公司，063004，唐山；
2.2. 北京石油化工学院机械工程学院,102617，北京；
3.3. 北京工业大学环境与能源工程学院,100124，北京
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Affiliation:China Railway First Group Second Engineering Co., Ltd., 063004, Tangshan, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2022.09.031
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中图分类号/CLCN:U231.3;TU94
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栏目/Col:施工技术
摘要:
随着城市轨道交通体系的发展，暗挖车站施工工法获得了广泛应用。其中的PBA（洞桩逆作）法利用小导洞施作围护桩、梁，再施作二衬拱盖结构形成完整的受力体系。模板支架为移动装配式组合，通过倒链牵引模架体系移动。施工过程中先进行导洞初支破除，完成防水施工与钢筋绑扎后进行模板支架安装；浇筑二衬扣拱混凝土后进行下一段（仓）二衬扣拱施工，同时对刚完成的上一段（仓）二衬扣拱段设置钢拉杆；下一段（仓）二衬扣拱防水、钢筋绑扎完工后千斤顶卸力，最终使模架落在移动轨道上。通过改进施工步骤和移动装配式模架体系，减少了资源投入，进而在降低建造成本的同时提高了施工效率。
Abstracts:
With the development of urban rail transit system, the construction method of underground excavation station has been widely used. In the method of PBA (pile beam arc), the small pilot hole is used as the retaining pile and beam, and then the second lining arch cover structure is used to form a complete stress system. The formwork bracket is a movable assembled modular formwork which is pulled by the chain. In the construction, initial support breaking of pilot hole is first carried out, then after waterproofed and steel bar ligature completed, modular formwork is installed. After second lining arch concrete is poured, the next section (bin) and second lining arches are constructed, and a steel tie rod is arranged for the newly completed section (bin) and second lining arch sections. After the second section (bin) of the second lining arch, waterproofed and steel bar ligature is completed. Then the jack is unloaded, and the formwork falls on the moving track. Through the improvement of construction steps and mobile assembly formwork system, the resource input is reduced, the construction cost is reduced, and the construction efficiency is improved.
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