基于实测数据的大体积混凝土温控分析评价

Evaluation of Temperature Control Analysis for Massive Concrete Structure Based on Measured Data

大岳高速洞庭湖大桥为主跨1 480m钢桁梁悬索桥,君山侧锚碇锚块为大体积混凝土结构,施工过程中进行了温控。为了对该桥君山侧锚碇锚块大体积混凝土施工过程进行分析评价,指导温控工作,引入模糊层次法,以大体积混凝土施工技术规范为标准,结合施工过程中的实测数据,根据过程影响结果的因素建立等级评价体系,基于温控工作实际情况拟定评价标准,采用专家评测和"1-9"标度法确定综合权重,利用模糊层次方法建立评价矩阵。结果表明:该桥君山侧锚碇锚块大体积混凝土温控工作的总体评价为"非常好",其中需要改进的方面主要集中在通过优化混凝土配合比达到缩短温峰阶段的效果,以及从现场增加保温层厚度方面减小施工期间里表温差。

The Dongting Lake Bridge on Linxiang-Yueyang Expressway is a steel truss girder suspension bridge with a main span of 1 480 m. The anchor block on the Junshan side is a massive concrete structure,during the construction of which, temperature control was conducted. To ana-lyze and evaluate the temperature control in the construction of the massive concrete anchor block and guide the temperature control work, the fuzzy analytical hierarchy process （FAHP） was intro-duced. On the basis of the criteria specified in the Code for Construction of Massive Concrete, to-gether with the measured data in the construction process, the hierarchical evaluating system was established according to the rule of process influencing the result. The evaluating standards were fit based on the actual temperature control conditions. And the expert commentary and one-nine method of AHP were used to determine the comprehensive weights, and the FAHP was used to es-tablish the evaluating matrix. The results demonstrate that the temperature control work for the massive concrete of Junshan-side anchor block is generally evaluated as very good. The works nee-ding improvement mainly include optimizing mixing proportion of concrete to shorten the tempera-ture peak stage and increasing the thickness of thermal insulating layer to reduce the surface and inside temperature difference during the construction process.