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桥梁大体积混凝土承台,水泥凝结时,会产生大量的水化热,由于混凝土是绝热材料,因此产生的水化热不能及时释放,导致大体积混凝土内部温度不断升高,形成混凝土的内外温差,当温差过大或升降速度过快时,混凝土就会出现温度裂缝。温度裂缝的产生会降低承台基础的承载能力,降低混凝土的耐久性,造成桥梁安全隐患,危害极大。通过银百高速公路(G69)建设项目甜永段无日天沟特大桥承台大体积混凝土水化热的温度控制实例,分析和研究大体积混凝土设计、实时监测混凝土在施工、养护期间,沿承台长度、高度和宽度方向的混凝土温度变化状态,实行信息化控制,及时优化设计方案、调整保温及养护措施,使混凝土温度梯度和温度增量不致过大,有效控制有害裂缝的产生。
Due to the concrete is adiabatic material, the heat of hydration produced in the bridge can not be released in time, resulting in the continuous increase of the temperature inside the mass concrete to form the temperature difference between the inside and outside of the concrete , When the temperature difference is too large or the lifting speed is too fast, the concrete will appear temperature crack. The occurrence of temperature cracks will reduce the bearing capacity of foundation, reduce the durability of concrete, resulting in hidden dangers of the bridge, a great harm. Through the example of the temperature control of mass concrete hydration heat in the construction of Yin-Bai Expressway (G69) project, the design and construction of large-volume concrete, the real-time monitoring of concrete during construction and maintenance, Taiwan length, height and width direction of the concrete temperature changes, the implementation of information control, timely optimization of design options, adjust the insulation and conservation measures to concrete temperature gradient and temperature increase will not be too large, effectively control the production of harmful cracks.