 Camlachie – Phase 6
Client: West of Scotland
The Grouting division Norwest Holst Soil Engineering is underway with a £1.4M contract to consolidate shallow mine-workings at Barrowfield Street, Glasgow. The contract, which is to be undertaken in two phases, is for West of Scotland Housing Association under the supervision of specialist consultants JWH Ross & Co.
The contract, entitled Camlachie Phase 6, will prepare this Brownfield site, currently occupied in part by a Glasgow Celtic Football Club coach park, areas of landscaping and derelict land, for the next phase of construction. The works comprise the formation of approximately 2100 rotary percussive boreholes by up to 8 No. drilling rigs and the injection of approximately 9000 tonnes of Cement/PFA grout.
The treatment works are arranged on a 3m grid across the site and are designed to consolidate abandoned mine-workings in both the Glasgow Ell Coal Seam and the Glasgow Main Coal Seam at depths up to 45m below ground level.
Each rotary percussive borehole will employ steel casing to case through up to 30 metres of overburden and into the underlying rock. The holes will then be progressed through this casing into the shallow mine-workings beyond by rotary percussive methods. Each individual borehole is subject to controlled grout injection under pressure until consolidation is complete.
The photograph above depicts a Boart Longyear Deltabase 100 drilling rig, one of two DB 100’s purchased by Norwest Holst to complement the current rotary percussive fleet, now 18 rigs in total.
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