大跨径连续刚构桥Y墩混凝土水化温度与应力控制研究

Study on Hydration Temperature and Stress Control of Concrete for Y Pier of Long Span Continuous Rigid Frame Bridge

以深圳轨道交通6号线Y墩连续刚构桥为背景,针对该桥Y墩的结构特点和施工条件,开展了影响该构件耐久性的关键问题探讨。分析了水化过程中构件的温度场变化及温度应力的变化情况,并提出合理的温控措施进行了研究,通过研究可将Y墩混凝土的应力控制在较低水平,避免混凝土出现温度裂缝,提高构件的耐久性。通过研究,可让更多的桥梁工程师认识到混凝土水化热对桥梁构件的影响,在混凝土桥梁构件的设计和施工过程中应该对混凝土水化热的影响予以充分的重视。

This paper is based on the continuous rigid frame bridge of Y pier No.6 of Shenzhen rail transit line. The structural characteristics and construction conditions of Y pier of this bridge are discussed, and the key problems affecting the durability of this bridge are discussed. The change of temperature field and the change of temperature stress in the process of hydration were analyzed. And the reasonable temperature control measures have been studied. Through the study of this paper, the stress of Y pier concrete can be controlled at a lower level to avoid the temperature cracks and improve the durability of concrete. In addition, through this research, can make bridge engineers realize rnorc influence of concrete hydration heat on bridge components, should influence of concrete hydration heat in the orocess of desiam and construction of concrete brid^e members of full attention.