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is a quick and non-invasive method for assessing the quality and continuity of foundation piles. It helps detect cracks, cross-sectional reductions, or other defects without excavation or damaging the element. It is especially useful for quality control in large pile groups.
How it works
A small mechanical impact (typically a hammer blow) is applied to the pile head, and a sensor records the reflected wave. By analyzing the waveform, engineers can assess the continuity and estimated length of the pile. The method uses low-strain stress wave propagation.
Cleaning and leveling the top of the pile to ensure accurate measurements.
Mounting an accelerometer to the pile head
Striking the center of the pile head with a hammer while recording the wave response.
Reading the waveform to detect reflections from defects or the pile toe
PIT process steps
The test can be performed shortly after casting, before loading or backfilling. It's ideal for rapid quality assurance across large numbers of piles.
On-site logistics
Checking whether the pile is accessible and testable under current site conditions.
Device setup
Adjusting sensor sensitivity and initializing the data acquisition system.
Repeated measurements
Recording wave responses for each pile in a series.
Quality assessment
Identifying continuity issues, defects, or anomalies in pile execution.
PIT benefits
Enables efficient testing of large numbers of piles in a short time.
Early detection of defects reduces foundation risk.
No need to damage or expose the pile for testing
Ideal for routine quality assurance on large-scale projects.
Gdzie znajduje zastosowanie
It detects changes in impedance, which indicate variations in stiffness or geometry. It's best for identifying major issues like necking or breakage but may not detect small voids.
A handheld hammer, an accelerometer, and a portable data acquisition unit are typically used.
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ABOUT THE COMPANY
Geotechnical investigation
We operate in Europe as:
DK
DMT Engineers A/S
DMT Engineers A/S
Skomagervej 13C
7100 Vejle
CVR-np. 12476779
DE
DMT Ingenieure GmbH
DMT Ingenieure GmbH
Zum Audorfer See 9
D-24782 Büdelsdorf
Registergericht: Amtsgericht Kiel HRB 12196 KI
Geschäftsführer: Lars Gøttrup Christensen
USt-IdNr.: DE134866110
Sitz der Gesellschaft: Zum Audorfer See 9, D-24782 Büdelsdorf
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