DPT Australia Pty Ltd






DPT

DPT Australia Pty Ltd

Our Services



PDA© Testing
PIT™ Testing
Cross-Hole Analyzer/ Sonic Logging(CHAMP®)
Signal Matching Analysis
(using CAPWAP®)
Vibration and sound monitoring
- SSU Seismograph
Ultrasonic Weld Testing

Today's high foundation loads and fast track jobs require modern construction control. The Pile Driving Analyzer® (PDA), Pile Integrity Tester™ (PIT), Cross-Hole Analyzer® (CHAMP) and the signal matching analysis CAPWAP® programme serves to verify the integrity, driving stresses, hammer performance and bearing capacity as well as quality and consistency of various pile installations. We also provide vibration and sound monitoring services using the SSU Seismograph during pile installation. This could protect both owners and contractors from potential litigation should adjacent properties be damaged during the course of construction.

DPT aims to provide quality testing methods and analysis techniques not only for testing piles but also for revaluation both before, during and post installation of piles. These testing tools are applicable to all type of piles, be it driven or cast-in-situ. Geotechnical engineers and contractors would find these tools helpful in improving quality control and installation of safe and economical piled foundations. The company is working towards offering ultrasonic weld testing services by 2009.


Please click for a list of published technical papers on the subject below:

CAPWAP Analysis

Cross Hole Sonic Logging (CSL)

High Strain Dynamic Load Testing or PDA Testing

Low Strain Integrity Testing or PIT Testing


Please Contact Us now to discuss
your requirements and how we can help.
PDA Testing is used to provide data on strain or force and acceleration of a pile under an impact force. The data is used to evaluate the bearing capacity and the structural integrity of the pile as well as hammer performance, pile stresses and soil characteristics, such as soil damping coefficients and quake values.

Pile integrity, which is accurately evaluated on site, would allow the engineer to accept/reject the pile immediately.
PIT is a quick and cost effective method to evaluate the shaft integrity of cast-in-situ piles. The testing is able to provide information on:

a) physical dimension

b) pile continuity

c) consistency of material

Low Strain Pile Integrity Testing is normally carried out on cast in-situ piles. Driven piles are also able to be tested the right condition. The effectiveness of the system is limited to a pile length not exceeding 30 to 60 pile diameters depending on soil condition and concrete quality.
CHAMP is used to detect defects in cast in-situ bored piles caissons, barrettes and diaphragm walls.

When cast in-situ piles are constructed, the following defects may occur, hence the main objectives in the testing is to provide the client/consultants information about :-

a) honeycombing due to inadequate vibration.

b) segregation due to over vibration and improper concrete placement methods.

c) washouts of cement due to groundwater flow.

d) cracks in pile shaft due to shrinkage.

e) inclusion of foreign material causing contamination of the concrete.

f) necking of the pile due to collapse of side walls during withdrawal of the temporary casings.

The force and velocity data obtained in the field by the PDA is processed and a representative blow will be used for further analysis using the CAPWAP suite of computer software. A typical outputof the CAPWAP results will be :-

a) Total computed soil capacity
- sum of Skin Friction and Toe Bearing

b) Computed load against settlement curve

c) Resistance distribution along pile shaft
This tool is used for monitoring ground/ structures vibration emission levels. The results obtained are in the form of Peak Particle Velocity (PPV). The PPV obtained is compared to the allowable emission levels for the particular structures evaluated.

Sound monitoring is also similar to vibration measurements. It measures the maximum noise level at the transducer location. This results are then compared to the recommended levels by the local authority or the environmental noise and vibration emission limits.
Non destructive testing of welds using Ultrasonic Examination to quailfy welding procedures and to ensure quality of finished welds.