灌注桩钢筋笼长度及长桩桩长无损检测技术研究

Research on Nondestructive Detection Technology of Reinforcement Cage Length and Long Pile Length in Cast-in-situ Pile

常规的建筑基桩检测技术还无法无损检测灌注桩钢筋笼长度及长桩桩长。磁测井法利用灌注桩中钢筋笼和周围介质的磁性差异来检测其长度,旁孔透射波法利用桩身和桩底以下土层中地震波传播速度和能量衰减差异来检测桩长。两种方法都不破坏桩结构,且在工程实践中取得满意的效果,值得推广。

At present, it is impossible for the conventional building foundation pile testing technology to make nondestructive testing on reinforcement cage length and long pile length in cast--in--situ pile. Magnetic logging method uses the magnetic differences of the pile reinforcement cage and the medium surrounding to detect the reinforcement cage length. The byhole transmission wave method uses the differences of seismic wave propagation velocity and energy attenuation between the pile and the soil under the pile to detect the pile length. The two methods do not destroy the pile. Satisfactory results have been obtained.