摘要
本研究考虑了大体积海洋混凝土的复杂海上施工环境长江三角洲跨海大桥DSSJ03标段斜拉桥主塔承台浇筑工艺宁波舟山港。采用MIDAS/Civil有限元软件方法对温度场进行分析ZT4号主塔承台大体积海工混凝土的流动模拟与优化冷却水管的流速、进水温度，以及优化原有管道冷却方案。与实际监测的混凝土水化热温度数据相比，施工过程中，优化后的管道冷却方案冷却速度控制在2℃/d以内，应力安全系数高，有效降低了海洋温度应力的影响主塔盖顶混凝土。此外，位于主塔盖顶的大体积海洋混凝土部分产生裂缝恶劣海上环境下施工的可靠性下降，对海洋混凝土浇筑施工质量提出了更高的要求。复杂的海上环境得到改善。
关键词： 跨海斜拉桥；大体积混凝土温度场；管道冷却优化
Abstract
This study considered the complex offshore construction environment of the mass marine concrete pouring processes for the main tower cap of the sea-crossing cable-stayed bridge in the DSSJ03 bid section of the Ningbo Zhoushan Port. A MIDAS/Civil finite element software method was used to analyze the temperature field of the mass marine concrete of the No. ZT4 main tower cap, for the purpose of simulating and optimizing the flow velocity and inlet water temperatures of the cooling water pipes, as well as to optimize the original pipe cooling scheme. It was found that when compared with the actual monitoring temperature data of the hydration heat during the construction process, the cooling rate of the optimized pipe cooling scheme had been controlled within 2℃/d, with a high stress safety factor. This had effectively reduced the impacts of temperature stress of the marine concrete of the main tower cap. In addition, the generation of cracks in the mass marine concrete sections located in the harsh offshore environment was decreased, and the construction quality of the marine concrete poured into the complex offshore environment had been improved.
Key words： Sea-crossing Cable-stayed Bridge; Mass Concrete Temperature Field; Pipe Cooling Optimization
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