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针对水闸闸墩、渡槽槽壁、地涵边墙、船闸边墙和导流墙等水工墩墙型混凝土结构在施工期经常会防不胜防地出现裂缝的现象,在理论上探讨了这种裂缝产生和扩展的机理,认为墩墙混凝土的基础温差、内外温差和收缩变形是裂缝出现的主要原因,尤其是刚施工不久混凝土墩墙的裂缝主要是由结构内外温差应力和自生体积变形应力所致。因此,施工期采用冷却水管降低墩墙内部温度和减小内外温差是防止裂缝出现的极有效的积极的温控措施之一。借助于水管冷却混凝土温度场的理论严密算法,详细仿真计算分析了某个水闸闸墩施工期的现场水管冷却试验及其温控防裂效果,并给出某些应用水管冷却措施时的建议。
In view of the phenomenon that the hydraulic pier wall concrete structures such as the sluice gate pier, the aqueduct tank wall, the side culvert side wall, the shiplock side wall and the dredging wall are often hard to be prevented during the construction period, such cracks are theoretically discussed And the extended mechanism, it is considered that the foundation temperature, internal temperature and external temperature difference and shrinkage deformation of pier concrete are the main reasons for the cracks. Especially, the crack of concrete pier wall is mainly caused by temperature difference stress and autogenous volume deformation stress. Therefore, the use of cooling pipes during construction to reduce the temperature inside the pier wall and reduce the temperature difference between inside and outside the cracks to prevent the emergence of a very effective and positive temperature control measures. With the help of the theoretical rigorous algorithm of cooling pipe concrete temperature field, a detailed simulation and analysis of a sluice pier on-site during the construction of the pipe cooling test and its temperature control cracking effect, and some recommendations when the water pipe cooling measures.