基于工程可行性的船闸底板水管冷却方案研究

冷却水管通水降温是大体积混凝土常用的温控措施,合理的水管冷却方案不仅要保障混凝土的温度和应力满足要求,避免裂缝的产生,同时也要兼顾经济成本和施工可行性。为得出切实可行的水管冷却方案,文章以船闸底板混凝土工程为例,首先基于温度实测值对大体积混凝土的热学参数进行动态反演,获取混凝土施工期真实的热学参数以保障有限元计算的准确性。综合考虑参数对温度的影响以及施工可行性,提出改变水管布置形式、通水时间、通水流量优化水管冷却方案。结果表明,3种水管冷却方案混凝土的最大温差不超过25℃,达到了防裂效果,且方案2节约经济成本,方案3兼具成本控制和便捷施工的优势,为后续底板混凝土工程水管冷却方案的制定提供了指导。

Water pipe cooling is a common temperature control measure for mass concrete. A reasonable water pipe cooling scheme should not only ensure that the temperature and stress of concrete meet the requirements and avoid cracks, but also take the economic cost and construction feasibility into account. In order to obtain a feasible water pipe cooling scheme, taking the concrete project of lock floor as an example, the thermal parameters of mass concrete are dynamically inversed based on the measured temperature, and the real thermal parameters during concrete construction are obtained to ensure the accuracy of finite element calculation. Considering the influence of parameters on temperature and the feasibility of construction, the water pipe cooling schemes are optimized by changing the water pipe layout, water flow time and water flow rate. The finite element calculation and analysis of temperature field and stress field show that the maximum temperature difference of concrete in the three water pipe cooling schemes is less than $ 25\,^{\circ}C $, and the crack prevention effect is achieved. The scheme 2 saves economic costs, and the scheme 3 has the advantages of cost control and convenient construction, which provides guidance for the formulation of water pipe cooling schemes in subsequent floor concrete projects.