[提要]  介绍了DX多节挤扩灌注桩以及桩身完整性检测技术的基本原理，着重介绍了用PTA动测系统按反射波法检测DX桩的完整性，并给出2根1岔4盘的DX桩的完整性检测实例。
[关键词] DX桩  完整性检测  PTA动测系统  反射波法

The basic principle of DX pile with extruding-expanding multi-brace-disk for integrity test are introduced, then integrity inspecting DX pile by reflected wave method using the PTA inspection system is importantly described. Finally the examples of integrity inspecting two DX piles with one branch and four disks are described.
Keywords:  DX pile; integrity inspection; PTA inspection system; reflected wave method