摘要
介绍了低应变反射波法桩基检测的基本原理,并用该法对某工地施工的桩基进行了检测(灌注桩837根,人工挖孔桩456根)。通过对现场采集数据进行分析,总结出在桩基检测过程中桩头的处理及平整度、锤击位置、落锤速度、加速度传感器粘贴位置、锤头特性对数据采集的影响,并给出现场操作建议。检测结果表明:桩头避免浮浆清理不彻底,锤击位置与粘贴传感器位置应平整;粘贴位置可选在1/2R^2/3R位置;应用柔性锤头来检测。在发现浅层部位信号发生异常时,采用刚性锤头进行激振配合柔性锤头收集的数据,可更清楚地识别浅层缺陷。
Pile foundation detection by the low strain reflected wave method was introduced. With the method, the detection of pile foundations at a construction site was carried out, including 837 cast-in- place piles and 456 hand-dug piles. Through the analysis of the collected data, it is concluded that the data is influenced by many factors such as the pile head＇ s smoothness, hammering position and speed, sensor position and hammer head＇ s characteristics. To get good results of detection, suggestions are pro- vided accordingly, including： （ 1 ） Laitance at the pile head should be completely cleaned up ; （2） Ham- meting and sensor positions should be smooth as far as possible; （3） The paste position of sensor should be 1/2R ~ 2/3R; （3） A hammer with soft head should be used for detection. But when a shallow posi- tion shows an abnormal signal, a rigid hammer should be used together with the soft one for data collec- tion, so as to identify the shallow defects in a more accurate way.
出处
《西南科技大学学报》
CAS
2013年第3期40-44,共5页
Journal of Southwest University of Science and Technology
关键词
低应变反射波法
灌注桩
人工挖孔桩
桩基检测
Low strain reflected wave method
Cast-in-place pile
Hand-dug pile
Pile foundation detection
