The invention relates to a technology for performing foundation
pile quality detection and geology survey by adopting a
single tube longitudinal wave method. The technology is relevant to comprehensive testing of the actual using effect of a foundation
pile and is characterized in that
longitudinal wave transmitting downwards along a
pile body is generated by knocking the top surface of the foundation pile, the
longitudinal wave velocity and pile length of the foundation pile can be accurately measured by detecting the
time difference of arrival of the longitudinal wave in a sounding
pipe, and the quality of pile body concrete can be judged; actual measurement on the
time difference of arrival of the longitudinal wave which is transmitted from the pile side soil along the knocked pile body can be conducted in adjacent pipelines or geological bore holes, and the length of the foundation pile, the pile body quality and the chambering degree can be measured; and the wave length of a geological soil layer can be measured, the condition of the geological soil layer around the pile can be judged, and the rock-inlet condition of the foundation pile can be analyzed. By means of the technology for performing foundation pile quality detection and geology survey by adopting the
single tube longitudinal wave method, a
signal processor can be configured externally or inserted in on the basis of the existing low-strain
ultrasonic detection devices and the like, the technology can achieve foundation pile quality
nondestructive testing and geology survey, is an economic and ready-made pile foundation
nondestructive testing auxiliary validation method and can remarkably improve accuracy and service level of pile foundation quality decision.