G O P H E R S D R I L L S T E E L S Pr oject: Client: Design & Build Main Contr actor: Pr oducts Used: Gl enholt T unnel Air Shaft St abilisation ® W eldgrip Fibr egrip Rockbolts W eldgrip W elded Mesh P anels Amalgamat ed Cons truction Co. Ltd. Railtr ack Case Study W E L D G R I P W E L D G R I P W E L D G R I P O C H L G T E N I E C AAir shaft e x c avat ed fr om the surf ac e in 1m lifts . ® A 4.5 metr e squar e section supported by Fibr egrip Rockbolts and W eldgrip Steel Mesh. The Gl enholt T unnel Maintenanc e Pr oject was a part of Railtrack’ s c ontinual upgrade t o it’ s rail netw ork infras tructur e. Part of the tunnel ’ s maintenanc e invol ved s tabilisation of an air shaft abo ve the tunnel, which had been fill ed in many year s earlier . Consolidation of the l oose fill in

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