TunnelA challenging concrete lining job within the tunnel system in Gibraltar.
The tunnel was required to be concrete lined to stop any further erosion.
Reinforcing bar was fixed to all walls to help stabilize the surface prior to spraying.
Concrete was sprayed to a depth varying from 150mm to 800mm.
Because of the restricted access of plant due to confined spaces, all material was moved into final position by hand, roughly 250 tons. Extraction systems were put in place on the compressor to remove all harmful fumes completely out of the tunnel system. Total time of works was 8 weeks with one week for plant removal and site tidy up.