Pushing the limits of investigation techniques

Since the Canterbury earthquakes, a number of innovations have been developed to assist engineers in obtaining better quality data regarding the condition of hard to reach structural elements. The subfloor rover survey probably tops this list giving a reliable overview of foundation condition even when access is limited.

Typically this type of investigation has been used for reviewing subfloors in suspended timber frame dwellings, however, FCEL have collaborated with Cavity Critter on two recent projects to investigate the underside of concrete slab foundation supported off deep precast concrete piles.

This is possible thanks to the ground dropping relative to the piled foundation by around 400mm. This previously unseen underslab area is akin to another world and this posed a number of challenges in avoiding losing contact with the remote vehicle.

Issues with signal transfer and unstable tailings all required careful planning in gaining a clear view of the overall condition of the piles and caps.

The client was very happy as these additional investigations allowed a repair to be undertaken in lieu of what was initial expected to be a foundation rebuild.

 
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