高墩大跨连续刚构桥合龙顶推力研究及效应分析

Research on the Jacking Force of the Long-Span Continuous Rigid Frame Bridge with High Piers and Its Effect Analysis

本文分析了影响高墩大跨连续刚构桥顶推力的因素,结合石堡川河特大桥,计算该桥顶推位移及顶推力,并分析施加顶推力时,结构运营10年的桥梁的墩顶水平偏位、墩底受力的情况。通过结果表明:顶推施工改善了墩顶偏位,保证了主墩的竖直;改善了墩底长期的受力状态,避免桥梁在运营阶段墩底的弯矩过大,出现裂缝的困扰。

This paper analyzes the factors affecting the jacking force of a high-pier and long-span continuous rigid frame bridge,and calculates the thrust displacement and thrust of the bridge based on Shibaochuan River Bridge.It also analyzes the horizontal displacement of the top of the pier and the force on the bottom of the pier when the structure has been operating for ten years.The results show that the jacking construction improves the deviation of the top of the pier and ensures the verticality of the main pier.It improves the long-term stress state of the bottom of the pier and avoids the problem of excessive bending and cracks at the bottom of the pier during the operation of the bridge.