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Case study: Subscan utility locating surveys reduce risk and improve pricing of redevelopment work

Because previous plans were mainly hand drawn by the drainage companies and then scanned as pdfs, numerous subsequent works were required to tie in missed areas of plans to enable works to proceed safely. After a utility locating survey, Subscan creates detailed CAD drawings which the client can pass onto its groundworks contractors. This helps them price the work more accurately and reduces their risk when on-site.

Subscan takes great care to minimise disruption in the store; many of which are in operation 24 hours a day.

When Subscan arrives on site, its surveyors first undertake an accurate topographical survey of all drainage infrastructure within the site boundary including the internal shop floor. This can be undertaken on a stand alone basis using the latest survey technology (GPS & Total Station) or as a tie in to an existing site survey. The net outcome is that the external and internal areas of the store are mapped accurately on a common survey grid. Existing internal floorplan information is imported into the survey framework to relate all spatial aspects together on one drawing.

Subscan then carries out a full drainage mapping survey, networking all drainage runs using radio detection equipment and sonde transmitters to give an accurate line of the pipes. The pipe runs are accurately positioned by terrestrial survey techniques and overlaid on to an AutoCAD drawing for future use.

When the drainage system has been mapped, the CCTV team follows on and conducts a full condition survey of the pipework in conjunction with a jet Vactor unit to pre-clean all accessible drainage. This enables the most accurate assessment of the structural integrity.

A full report is produced using industry standard Wincan software, grading all defects to enable a planned maintenance programme to be implemented. The final product sent to the client consists of a fully cross-referenced report to an AutoCAD drawing.

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