G O P H E R S D R I L L S T E E L S Pr oject: Client: Consultant: Main Contr actor: Pr oduct Used: Conisbr ough T unnel Refurbishment ® W eldgrip Gripf or c e Injection T ubes Donaldson As sociat es Railtr ack pl c Amalgamat ed Cons truction Co. Ltd. The r efurbishment of Conisbr ough tunnel is part of Railtrack’ s ongoing pr ogram of impr ov ements to the r ail network. The tunnel, which is 6.1 metr es wide and 235m l ong, is on the main line between Donc ast er and Sheffield. The tunnel was c ausing speed r estrictions on the line due t o inadequate cl earanc es and r epairs w er e r equir ed in two ar eas. The r epairs inv ol ved t aking out the e xisting brick lined s teel ar ch r einf or c ement fr om pr evious r epairs c arried out in the late 1800’ s. Bef or e the work c ould be

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