This test covers the procedure for determining the integrity of individual vertical or inclined piles by measuring and analysing the velocity (required) and force (optional) response of the pile induced by an (hand held hammer or other similar type) impact device usually applied axially and perpendicularly to the pile head surface. This test is applicable to long structural elements that function in a manner similar to any deep foundation units (such as driven piles, augured piles,or drilled shafts), regardless of their method of installation provided that they are receptive to low strain impact testing.

The PIT performs wave equation-based non-destructive foundation investigations known as Low Strain Impact Integrity Tests or Low Strain Dynamic Tests. These test may be performed by the Pulse (or Sonic) Echo or Transient Response Methods. With the PIT, any form of the test is performed fast, potentially making it possible to test every pile on a job site.

Test Procedure:

The test consists of attaching one or two accelerometers to the foundation and using a hand-held hammer to impact it. The PIT collects the acceleration data and displays curves that reveal any significant changes in cross section that may exist along the shaft. With the device software: the data is post-processed and generates reports, while the software simulates a PIT test and performs simplified signal matching to assess the shape of the foundation.