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西固黄河大桥是兰州南绕城高速公路建设项目中的控制性工程,该桥为高速公路跨越黄河而设,全长1003m,主桥桥面宽27.5m,为双塔三跨半漂浮体系结合梁斜拉桥。主塔桥墩第一节设计为实心段C50大体积混凝土,为了防止高标号大体积混凝土构件在施工过程中由于内外温差产生裂缝缩短桥梁使用寿命,需对大体积混凝土结构进行合理的温控设计与控制,并将大体积混凝土温控技术应用于施工过程中。通过对温控结果的数据分析,表明混凝土温控技术对大体积混凝土裂缝控制效果显著,确保了施工质量。
The Xiguyi Yellow River Bridge is a controlled project in the construction of Lanzhou Nanhuancheng Expressway. The bridge is a freeway spanning the Yellow River with a total length of 1003m and a bridge deck of 27.5m, which is a combination of a three-span and two-span half-float system Beam cable-stayed bridge. The first section of the main tower pier is designed as a solid section of C50 mass concrete. In order to prevent the cracks of the high-grade large-volume concrete components due to the temperature difference between inside and outside, shortening the service life of the bridge, a reasonable temperature control design is required for the mass concrete structure Control, and mass concrete temperature control technology used in the construction process. Through the data analysis of the temperature control results, it shows that the concrete temperature control technology has significant effect on the control of the mass concrete cracks and ensures the construction quality.