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大体积混凝土桥墩结构在工程中运用广泛,常常在施工过程中出现因混凝土水化热导致的温度裂缝。杭州九堡大桥地处钱塘江,受周期性钱江潮倒灌影响,桥墩所处水环境属于盐/淡水交汇区,水文地质条件复杂,环境对混凝土结构腐蚀性强烈,因此对桥墩结构的耐久性和施工过程中的结构抗裂提出了较高要求。本文针对九堡大桥桥墩结构设计,计算分析了几种施工条件下的水化热效应,并对不利施工条件下的抗裂策略进行了探讨。
The mass concrete bridge pier structure is widely used in engineering, and often causes temperature cracks caused by hydration heat of concrete in the construction process. Hangzhou Jiubao Bridge is located in the Qiantang River. Due to the periodic influx of Qianjiang tide, the water environment of the bridge pier belongs to the intersection of salt and fresh water. The hydrogeological conditions are complex and the environment is strongly corrosive to the concrete structure. Therefore, the durability of the pier structure And the structural cracking during construction put forward higher requirements. In this paper, according to the structural design of Jiubao Bridge Pier, the hydration heat effect under several construction conditions is calculated and analyzed, and the anti-cracking strategy under unfavorable construction conditions is discussed.