泵闸工程大体积混凝土结构裂缝控制关键技术研究

Research on Key Technologies for Crack Control of Mass Concrete Structure in Pump Sluice Project

摘要:

温度荷载是导致泵闸混凝土结构产生裂缝的主要原因之一。泵闸中的进出口流道结构、底板、墩墙的尺寸往往属于大体积混凝土范畴，其为空间复杂异性体，尺寸大且个性化突出，若施工过程中温控措施不合理，混凝土浇筑块内外温差过大，结构在变形约束和温度荷载的作用下，容易产生过大拉应力，显著增加结构的开裂风险。结合航塘港泵闸实际工程，从材料措施、温控措施、结构措施，以及管理措施方面综合讨论了泵闸工程大体积混凝土结构裂缝控制关键技术。其成果可为相似的工程提供参考。

Abstract:

Temperature load is one of the main causes for cracks in concrete structure of pump gate. The size of the inlet and outlet channel structure，bottom plate and pier wall in pump gate often belongs to the category of mass concrete. It is complex and heterogeneous with large size and outstanding individuality. If the temperature control measures are unreasonable and the temperature difference between the inside and outside of the concrete pouring block is too large, the structure is prone to produce excessive tensile stress under the effect of deformation constraint and temperature load, which significantly increases the risk of structural cracking.