大型泵站混凝土施工期削峰强度与水化热抑制剂、冷却水管参数的关系探究

Study on Relationship Between Peak Cutting Strength of Mass Concrete During Construction Period and Hydration Heat Inhibitor and Cooling Water Pipe Parameters

大型竖井贯流式泵站的结构比较复杂,各浇筑块的结构和尺寸不尽相同,温控指标也不同,特别是夏季施工时,温控防裂难度大。对于不同结构部位,应采用精细化的削峰强度指标。利用等效冷却算法分别模拟不同水化热抑制剂掺量和不使用水化热抑制剂情况下,长方体浇筑块在不同水管间距、通水水温、通水流量下的温度峰值削峰强度,提出了一系列定量公式。可根据水化热抑制剂的掺量和削峰强度指标,通过所提公式计算相应通水水温的冷却水管布置密度和通水流量。研究结果可为类似泵站在高温季节施工的定量温控措施制定提供参考。

The structure of large-scale shaft tubular pumping station is complex, the structure and size of each pouring block are different, and the temperature control index is also different. Especially in summer construction, it is very difficult to control temperature and prevent cracks. For different structural parts, refined peak clipping strength index should be adopted. In this paper, the equivalent cooling algorithm was used to simulate the peak-cutting intensity of cuboid pouring block under different water pipe layout, water temperature and water flow rate with different hydration heat inhibitor dosage and without hydration heat inhibitor. Then a series of quantitative formulas were put forward. According to the dosage of hydration heat inhibitor and peak-cutting intensity index, the layout density and water flow rate of cooling water pipes with corresponding water temperature can be calculated with these formulas. The results can provide quantitative reference for the establishment of temperature control measures for similar pumping stations constructed in high temperature season.