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Geotechnical & Structure monitoring Non-Destructive Testing Construction investigation
INTRODUCTION
Treatment of bored pile Purpose of the test: determine bearing capacity of bored piles/pre-cast pile/barrette... based on the measurement of velocity and forces at pile head using CASE method and/or CAPWAP. Testing method: Method used is to measure the velocity and stress by accelerometers and strain transducers under the impact of hammer, which is enough to drive the test pile 2-3mm down Testing procedure: arcordance to testing standard: ASTM D4945 or equivalent standards of other countries and Designer 's specifications. Testing steps: Attach 2 accelerometers and 2 strain transducers symmetrically to pile shaft at the level of 2 pile diameters from pile head. Enter the parameters, test sensors. Adjust the sensors if necessary. Drive 2 - 5 blows to the pile head using a heavy hammer. Check the signal quality, re-drive if the signals are not good. Turn off the equipment and move to other pile. Testing report: Project name and location/ The owner, designer, piling contractor and the tester. Tested pile records. Summary table of test results. Graphs of forces, velocity, bearing capacity, energy to time. Simulate load-settlement relationship graph and computing tables for CAPWAP analysis. Conclusion and comments.
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