Located in the high-speed railway with ballastless track, Xiawuji Canal Bridge in Tianjin-Qinhuangdao Passenger-dedicated Line is a unsymmetrical long-span long-unit continuous prestressed concrete girder bridge with the span arrangement (40 + 64 + 80 + 80 + 48) m. To control the stress and deformation, diminish the unbalanced bending-moment at the supporting point during cantilever construction and make the force of the finished bridge reasonable, several methods were adopted in the design, such as thickening the thicknesses of bottom slab and web slab of side span, installing some concrete pressure loadings. In addition, to distribute the seismic force into each middle bridge pier evenly, the dampers were installed on the high-speed bridge so as to make all the bridge piers endure the aeiamic force together.%津泰客运专线下坞蓟运河特大桥主桥(40+64+80+80+48)m预应力混凝土连续梁将大跨长联不对称结构应用于高速铁路无砟轨道桥梁.为了保证结构受力和变形,尽量减小悬臂施工支点不平衡弯矩扣成桥运营受力合理,采取加厚边跨底板与腹板厚度、设置混凝土压重的方法；为了将地震力均匀地分配到各中墩,在高速铁路桥梁上应用阻尼器,使各中墩共同承受地震力.
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