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水盘高速公路北盘江特大桥为5×30+82.5+220+290+220+82.5+7×30m预应力混凝土空腹(斜腿)式连续刚构,主跨290m按常规高标号混凝土(C55)施工目前属世界第一。主墩承台为28m×28m×5m,属典型的大体积混凝土块体,其所处地理位置环境复杂,昼夜温差极大,在施工中,对大体积混凝土的温度控制和裂缝控制难度较高。笔者采用大型有限元软件ADINA分析了温度应力分布,分析了环境温度变化以及分层浇筑对混凝土温度的影响,并采用了有效的温控措施,在施工过程中全面监测,通过减小混凝土内外温差、降低外界条件对混凝土变形约束,成功地完成了承台大体积混凝土的施工,积累了复杂地形、多变环境下的现场施工经验。
The Beipanjiang Special Bridge on the Water Expressway is a fast-moving (oblique leg) continuous rigid frame of 5 × 30 + 82.5 + 220 + 290 + 220 + 82.5 + 7 × 30m prestressed concrete with the main span of 290m at conventional high grade concrete (C55 Construction is currently the world’s first. The main pier cap is 28m × 28m × 5m, which is a typical mass concrete block. Its geographical location is complex and the temperature difference between day and night is very great. During construction, the temperature control and crack control of mass concrete are more difficult . The author analyzed the temperature stress distribution by using large-scale finite element software ADINA, analyzed the influence of ambient temperature variation and layered pouring on the concrete temperature, and adopted effective temperature control measures to fully monitor the construction process. By reducing the temperature difference between inside and outside the concrete , Reducing the external conditions on the deformation of the concrete constraints, the successful completion of the large-capacity concrete platform pile construction, has accumulated complex terrain, changing environment, the site construction experience.