沪宁城际铁路连续梁桩基纠偏技术

Deviation-rectifying Technique of Continuous Girder Bridge Pile Foundation for Shanghai-Nanjing Intercity Railway

软土地区的高速铁路连续桥梁桩基因单侧堆载受侧向压力而发生挠曲变形,导致无砟轨道方向发生变化,对高速铁路行车安全构成严重威胁。由于连续梁的桥梁桩结构以及周围建筑环境的复杂性,在纠偏过程中需解决纠偏效率及对其他建筑物产生的不利影响等难题。本文以沪宁城际铁路一连续梁的桩基横向纠偏为例,探讨连续梁纠偏的同步性,分析桩基变形时桩周土体变形规律,提出控制回弹量和防止周围建筑变形的具体工程措施,效果良好。

In soft soil areas some continuous girder bridge pile foundations of high speed railway had lateral flexure deformation induced by heaped load at single side.Because of the complexity of the continuous girder bridge pile foundation and the building environment around it,during the process of deviation-rectifying, it is necessary to solve the problems of deviation-rectifying efficiency and the adverse influence on buildings.Taking the deviation-rectifying of a continuous girder bridge pile foundation as an example,the synchronicity of deviation-rectifying was discussed,and the deformation rules of soil around pile foundation were analyzed.The detail engineering measurements were taken to control the pile foundation resilience and the deformation of building around pile foundation.The effect is well.