水下摄像和高强灌浆在预应力管桩承载力不足处理中的应用

Application of underwater photography and high strength grouting in the treatment of insufficient bearing capacity of prestressed pipe piles

摘要:

高强预应力混凝土管桩（PHC）具有质量预可视、高强环保、施工高效灵活等特点，在目前雾霾严重的北方高层建筑施工中得到了广泛应用。本文通过河南某小区高层住宅楼管桩工程施工实例，介绍了管桩施工过程中由于施工、地层等原因造成的承载力不足问题，在采用低应变等常规检测手段无法准确判定原因的情况下，利用水下摄像技术准确判定问题所在，并采用复压、高强灌浆等方法处理的过程，为类似工程的处理提供一定的参考价值。

Abstract:

High strength prestressed concrete pipe piles （PHC） have been widely used in the construction of high-rise buildings in heavy-haze shrouded northern China due to its features of pre-visible quality， high-strength， environmental protection， efficient and flexible construction. In reference to a field case of pipe pile construction for a high-rise residential building in Henan province， this paper introduces the problem of insufficient bearing capacity caused by construction， stratum and other factors in the process of pipe pile construction； underwater photography technology used to accurately determine the problem while the conventional detection methods such as low strain cannot accurately determine the causes； and the treatment process of re-pressing， high-strength grouting and other methods. It provides can some reference for the treatment of similar projects.