VJT Case Study – Hindhead A3 Road Tunnel Project

£370 million Twin Bore Road Tunnel

Anchors were supplied to the Civils Team for the construction of the new road tunnel: initially these were temporary fixings for ventilation and electrical services to support the TBM and early construction, but later specific fixing problems were solved…

A specialist system involving a shear pin was developed to fix and support a secondary concrete lining. This value engineered system precluded the requirement for resin anchors and allowed the backfilled mortar to be injected/ poured immediately. The VJT system improved productivity 6 fold.

VJT identified and tested a suitable anchor for fixing the ‘shotcrete’ containment. The special undercut anchor has an approval for cracked concrete and fire resistance, and displayed no displacement at the required proof loads.

Installation was 4 times faster when compared to the system originally specified.
Site Testing: all anchors were tested for suitability and workmanship using specially designed equipment from the VJT laboratory.

For durability and performance the FHB-DYN anchors were supplied in stainless steel (High Corrosion Resistant 1.4529) and full material certification was provided.

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