对于大跨径桥梁而言,在荷载试验中获得全桥的线形具有很重要的意义。为了突破全站仪无法获得全桥所有测点挠度数据的缺陷,采用测量精度为毫米级的连通管法挠度监测系统来实现桥梁挠度的多点同步测量,从而获得全桥的相对线形;通过菜园坝长江大桥的荷载试验,结果证明了系统的正确、可行性。 For long-span bridges, it is of great importance to obtain the full-line shape of the bridge during the load test. In order to overcome the defect that the total station can not obtain the deflection data of all measurement points of the whole bridge, the connection pipe deflection monitoring system with the measurement accuracy of millimeter is adopted to realize the multi-point simultaneous measurement of the bridge deflection so as to obtain the relative linearity of the full bridge. Dam load test Yangtze River Bridge, the results show that the system is correct and feasible.