Pile Integrity Testing
Tasmania
Sonic Echo / Impulse Response PIT for bridges, piers, jetties, towers and building foundations — depth, geometry and structural condition from the surface.
Pile Integrity Testing (PIT) Tasmania:
Sonic Echo & Impulse Response Concrete Assessment
Pile Integrity Testing (PIT) is conducted in strict accordance with ASTM D5882-16 and Australian Standard AS 2159-2009, covering complete testing procedures, data acquisition, advanced signal processing, and engineering reporting. This non-destructive testing method is vital for verifying deep foundation structures for civil infrastructure projects across Tasmania, including bridges, marine piers, jetties, transmission towers, and commercial buildings.
During a typical cross-hole or low-strain test, a compression or tension wave is introduced at the pile head using a specialized hand-held hammer. The acoustic wave travels through the concrete shaft and is reflected when it encounters a change in acoustic impedance—typically caused by a change in pile cross-section, concrete material quality, necking, voids, or the pile toe itself. A high-precision sensor at the pile head records the return signal for structural analysis.
This method effectively and accurately determines pile depth, geometry, and structural condition. It serves as a highly reliable tool for civil engineers assessing unknown existing foundations, as well as for quality verification of ongoing piling works. Spaulding Geophysics provides rapid-mobilisation pile testing services for contractors and developers throughout Hobart, Launceston, Devonport, Burnie, and regional Tasmania.
What PIT
Resolves
From a single hammer impact at the pile head, the reflected waveform yields a complete structural picture of the shaft — geometry, depth and any discontinuities along its length.
Five-Grade
Integrity Rating System
The reliability of defect identification and depth estimation depends on the accuracy of wave velocity determination and the overall quality of the pile. All piles are classified using a standardised five-grade system, ensuring defensible and consistent reporting across a foundation program.
Each classification carries defined reporting language, enabling clear communication between testing, engineering and project management teams — and straightforward integration with remediation planning.
Classification is conducted in accordance with ASTM D5882-16 and AS 2159-2009 — covering testing procedures, data acquisition, signal processing, interpretation and formal reporting.
New Works &
Existing Foundations
PIT delivers value at two distinct project phases — quality assurance during piling works, and condition assessment for aging or undocumented foundations.
Clear, Standardised
Reporting
Each pile tested is reported with its waveform trace, interpreted classification, and depth estimates — in a format suitable for direct submission to structural engineers and regulatory bodies.
| Item | Detail |
|---|---|
| Pile register | ID, location, design dimensions and test date for every pile tested |
| Velocity traces | Time-domain waveform for each pile — impact, reflections and toe response annotated |
| Frequency plots | Mobility spectrum where Impulse Response analysis is applied |
| Depth estimates | Calculated depth to anomaly and pile toe, based on calibrated wave velocity |
| Classification table | AA / BB / ABx / PFx / PDx rating per pile with supporting commentary |
| Plan layout | Classification colour-mapped onto foundation plan for rapid visual review |
| Recommendations | Engineering action items for each PFx and PDx classified pile |