For more than 20 years, the Pile Dynamic instrument, Pile Integrity Tester (PIT), has offered an ideal means of ensuring that piles and/or shafts are free of cracks and voids before construction of the superstructure. PIT may be used on most deep foundation systems, including concrete and wood foundations, as well as on piles supporting bridges or towers, also assessing their length. It performs wave equation-based non-destructive foundation investigations known as Low Strain Impact Integrity Tests or Low Strain Dynamic Tests.
In its simplest configuration, PIT consists of a main unit, one accelerometer and one hand held hammer able to perform the pulse echo tests. The hammer is used to impact the top of the foundation, producing a wave that propagates down the shaft and reflects upwards. An accelerometer at the top of the foundation receives the reflected waves, and based on the recorded data significant changes in cross section along the shaft may be revealed.
The Pile Integrity Tester is available in several configurations to match the needs of each user. The latest version, PIT-FV, comes with a large and bright color screen - 21.3 cm (8.4") and at 1.5 kg. It also features a standard USB port for convenient data transfer and is available with either one or two channels of data acquisition, both traditional (wired). The 2 channel model is most often supplied with one accelerometer (provides velocity data through integration) and one instrumented hammer (force data, hence the name PIT-FV). The particular model may also be used with a non-instrumented hammer and 2 accelerometers, technically making it a "PIT-VV".
Learn more on the different versions of the PIT, offered by Pile Dynamics Inc, as well as additional resources on PIT by clicking here!
Source: Pile Dynamics Inc
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