The Cross Hole Analyzer determines the quality and consistency of the concrete of drilled shafts, bored piles, cast-in-situ piles and other types of concrete foundations. As a professional criteria to determine the quality of deep foundations, we use the latest version of Pile Dynamics Inc. – Cross Hole Analyzer (CHAMP) which is ideal for testing four probes (six profiles) in just one pull, saving time and money. This test meets the specifications of ASTM D6760 and several other cross-hole sonic logging codes and standards.

Test Procedure:

A shaft is prepared with PVC or steel tubes during construction, transceivers are lowered into the access tubes to transmit a high frequency signal that travels through the concrete and is detected by the other probes which are acting as receivers. This action is repeated with the other probes being automatically configured as transmitters sequentially allowing profiles to be scanned with a single pull. As these sensors are raised and/or lowered along the length of the foundation/pile, the CHAMP-Q displays and records the strength of the received signal, as well as the time from signal emission to signal arrival as a function of depth. This allows evaluation of concrete quality and defect location along the length and by quadrant.

CHAMP’s CHA-W Data Processing Software provides powerful tools for data analysis such as:

• Ability to simultaneously review six data profiles
• History mapping of already collected data
• First Arrival Time (FAT) detection
• Easy defect identification
• Two methods of signal strength evaluation (energy or amplitude)

CHA-W reporting tools comprise of user customised graphs and tables:

• Sonic Map – Signal strength versus time and depth in traditional waterfall diagram
• First Arrival Time – Signal travel time from transmitter to receiver, versus depth
• Wave-speed Plot – Wave-speed (an indicator of concrete strength) versus depth
• Wave–speed Table – Wave-speeds, means and standard deviations
• Energy or Amplitude Plot – Signal strength versus depth
• Defect location graphically (horizontal redline) and in table format