Basement Plant Room GPR Scanning, London
London
900 mm
Scan depth
2 rooms
Scanned
1 m × 1 m
3D grid size
The Brief
A contractor needed to know what was in the floor of two basement plant rooms before starting new works. One room held the electrical plant. The other held the fire water tanks, pumps and generator.
What We Did
We scanned both rooms with a Proceq GP8000 GPR, combining 2D line scans and 1 m × 1 m 3D grids to a depth of about 900 mm.
What We Found
~120 mm
screed over a multi-layer build-up of about 400 mm, with voiding at the screed/slab interface
Ground beam
downstand ground beam beneath the screed areas
~600 mm
RC plant slab cast in two pours, with a cold joint at ~300 mm and two layers of reinforcement
Possible piles
vertical responses beneath the plant slab consistent with piles
Where GPR Stops
The void under the screed masked the signal below it. Rather than guess, we told the engineer which layers were interpreted and which were proven. We recommended targeted cores, borescope checks and covermeter readings to confirm the full build-up before anyone drills.
The Outcome
The engineer received an engineering report with annotated 3D scans, section drawings and a clear drilling status for every zone, along with a defined scope to close the remaining gaps.
Project Details
- Location
- London
- Service
- 3D GPR Concrete Scanning
- Equipment
- Proceq GP8000
- Scan depth
- ~900 mm
Related service
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