GBG investigates a wide range of structures from historically significant buildings to small private residences; all requiring expert appraisal when assessing their construction and condition.
Offshore Windfarm Foundations: GBG was asked to perform testing to ensure that injected mortar was correctly compacted to prevent ingress of sea water into the concrete turbine bases.
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Bishopsgate Tunnel, London, England
Survey to locate buried utilities and establish track support within C19th railway tunnel to enable Client to lower level of track.
Bramhope Tunnel, North Yorkshire, England
Survey to locate blind access shafts and determine their condition in railway tunnel built 1845-1849.
Caland Tunnel, Holland
Assessment of concrete condition, and depth of cover to reinforcement in pre-cast concrete tunnel.
Carvalho Pinto bored road tunnel, Sao Paulo, Brazil
Assessment of the thickness, layout of reinforcement, condition and integrity of sprayed concrete tunnel lining.
Clatworthy Tunnel, Somerset, England
Examination of integrity of in-situ cast concrete tunnel carrying water supply from reservoir to main outlet.
East Coast Mainline Tunnels, England
Investigation of tunnels on the East Coast Mainline between King's Cross and Edinburgh. The object of the survey was to establish the nature and condition of the linings, and to identify any potential areas of lining likely to contain blind access shafts.
El Salaam Tunnel, Egypt
Assessment of sprayed concrete tunnel lining in pipeline underneath Suez Canal.
Islington Canal Tunnel, London, England
Investigation to establish the construction and condition of the brickwork lining of a C19th canal tunnel.
Mersey Loop Tunnel, Liverpool, England
Survey to determine the 'as-built' construction and condition of narrow bore 1970's concrete tunnel.
Oporto Rail Tunnels, Portugal
Assessment of the integrity of the masonry linings to 13 railway tunnels near Oporto as part of the electrification programme of the railway lines.
Storebaelt Tunnel, Denmark
Assessment of condition of in-situ cast concrete of cross passage service tunnels.
Thames Tunnel, London, England
Examination of selected areas of brickwork in Brunel's foot tunnel under the Thames from Rotherhithe to Wapping.
GBG investigates a wide range of structures from historically significant buildings to small private residences.