当桩的断面发生变化时,如断裂或缩颈,桩顶瞬间施加的应力波就会在这样的断面产生反射。美国动桩公司的全套混凝土桩质量检测的 PIT 低应变分析系统,就是利用波在桩中传播及反射检测灌注桩或打入桩的桩身质量。PIT 系统可分析断面阻抗变化及诊断断桩、裂缝、缩 When the section of the pile changes, such as breaking or necking, the instantaneous stress waves applied at the top of the pile will reflect on such sections. The PIT low-strain analysis system for full-scale concrete pile quality inspection by American Kinematics uses wave propagation and reflection in the pile to check the quality of the pile or cast-in-place pile. PIT system analyzes changes in section impedance and diagnoses broken piles, cracks, shrinkage