悬臂浇注斜交连续箱梁桥的线形监控

The linearis monitoring under skew continuous box girder bridges cast with balanced cantilever method

针对施工过程中,由于测量误差、施工误差、设计参数误差以及模型的失真,桥梁施工的实际线形与施工理想线形之间总是存在偏差,以及斜交箱梁由于处于弯剪扭复杂的空间受力状态,无论是理论计算还是现场线形监控,相对于正交箱梁都复杂得多等问题,以某三跨斜交连续箱梁桥为工程背景,提出该类型桥梁线形监控的目的、技术和方法,以及线形监控关键点立模标高的影响因素和计算公式,介绍了计算斜交桥梁的计算方法,并讨论了斜交桥梁悬臂施工时箱梁挠度的变化规律,以及斜交、温度场对线形的影响与需要注意的问题。研究结果表明,所提出的技术和方法,可为同类型桥梁的施工监控提供参考。

During the process of construction, actual linearis of bridges is always different from ideal linearis of bridges, due to measure errors, construction errors, design errors and inexactitude model and so on. How to recognize and amend them is the key point of successful construction monitoring. Skew box girder is under a complex strained condition, so it is much more complex than the orthogonal box girder in calculating and linearis monitoring. Based on some 3 - span skew continuous box girder bridge, the intention, content, method about linearis monitoring of this kind of bridges were studied, and influencing factors and calculating method of form placing elevation were researched at the key point in linearis monitoring. And the ways calculating skew bridges were introduced, the disciplinarian of saggings change of box girder were discussed when it was cast with BCM, and the influence of skew supporting, as well as temperature field, on linearis and some questions were put forward. The results show that this theory and method have reference about construction monitoring to the same kind of bridges construction.