Qantas Lounge, Heathrow Terminal 3
Gwalia Surveyors was commissioned by ISG as survey consultants for the refurbishment works of Qantas Lounge at Heathrow Airport, London (LHR). Initially we produced a full measured building survey of the structure which was in a stripped back state with exposed walls, columns, beams, service ducts and pipes. An additional topographical survey of the roof was also produced to compare and relate internal services back to the roof. Data capture was performed by a combination of laser scanner and total stations across all floors.
The resulting point cloud was used to produce floor plans and ceiling plans detailing all services suspended from the structural ceiling. We were then asked to produce a detailed 3D CAD model of the building highlighting the services and ducts suspended from the ceiling in particular. Manipulating the point cloud enabled this information to be carefully extracted and thus produce the required 3D model without the need for further field data capture.
Due to the potential invasive works into the ceiling slab we were commissioned to undertake a ceiling survey to determine the layout and characteristics of the tendons within the concrete hollow core ceiling planks. The results of the survey would then be used to mitigate possible costs and programme implications. Data was collected using a handheld GPR and was gathered in both the x and y axis using a combination of 2D profiles and 3D grids. On site mark up was carried out at several locations in order for site personnel to visualise the tendon layout. Collected data was then downloaded and post processed allowing the data to be interrogated and manipulated in 3D. A technical report was also created to support and illustrate our findings.