全圆模板台车在自密实混凝土浇筑中上浮力的控制技术

Construction Technology of Buoyancy Control of Full-circle Formwork Trolley in Self-compacting Concrete Pouring

在北京市南水北调东干渠输水隧洞工程中,对全圆针梁模板台车在自密实混凝土浇筑过程中的上浮力控制技术进行研究,建立台车计算模型,确定材料属性、边界条件、加载条件、抗浮支撑力监测点后分析计算结果,并进行台车浮力现场测试试验,结合有限元分析,研究自密实混凝土浇筑过程中影响模板台车上浮的关键因素,对模板台车抗浮支撑所受支撑力变化规律、分布规律及控制模板台车上浮方法进行研究,形成自密实混凝土浇筑中全圆模板台车的上浮力控制技术,并在此基础上,提出台车抗浮支撑优化建议,给出台车上浮控制起点和终点范围,进一步证明混凝土浇筑控制方法、支撑力分布规律及最大值公式的适用性。

In the East Main Canal of the South-to-North Water Diversion Project in Beijing, the buoyancy control technology of the full-circle needle beam formwork trolley during the self-compacting concrete pouring process was studied. The trolley calculation model was established, and the material properties, boundary conditions, loading conditions, and anti-floating support force monitoring points were determined. After analysis of calculation results, the field test of the trolley buoyancy was carried out. Combined with the finite element analysis, the key factors affecting the floating of the formwork trolley during the self-compacting concrete pouring process were studied. The variation law and distribution law of the support force and the method of controlling the floating of the formwork trolley were studied. The buoyancy control technology of full-circle formwork trolley in self-compacting concrete pouring was formed. On this basis, the optimization suggestions of anti-floating support of trolley were put forward, and the starting point and end point range of floating control of trolley were introduced, which further proves the applicability of concrete pouring control method, support force distribution law and maximum formula.