桩端后注浆技术在既有桩基础利用中的应用

新建桥梁利用既有桩基础时,关键是控制新、老桩基的差异沉降。当对桩基变形控制有特殊要求时,可采用桩端后注浆技术来改善钻孔灌注桩的受力性能。结合某工程桩端后注浆技术的应用,介绍桩端后注浆技术对提高钻孔灌注桩的承载力、减少沉降变形的效果,简要分析了加固机理。介绍了桩端后注浆技术的施工方案及加固结果。

Application of Post-grouting on Pile End Technology in Existing Pile Foundation Usage

The key point is to control the differential settlement of new-building and existing pile foundations when using existing pile foundation in new bridge construction.With the specific requirements for the control of pile foundation deformation,post-grouting on pile end technology can be used to improve the stress performance of bored pile.Combined with a practical engineering case,the effects of post-grouting on pile end technology for improving of bearing capacity and reducing of settlement deformation are introduced in the paper.Then,the strengthening mechanism is put forward briefly.Finally,the construction plan and strengthening result are mentioned.