Brook Tunnel Modifications
McCrossin Foundations was subcontracted to install soldier piles for a support of excavation system required for the modifications of the Brook Tunnel required by The National Gateway project.
The diameter required for the soldier beams was 24 inch. Drilled depths were up to 50 feet in addition to rock sockets up to 30 feet. The caisson shafts were drilled primarily through fills and weathered shale in the soil portion and hard to very hard sandstone and limestone bedrock. Due to these conditions, some shafts required temporary casing during installation.
The modifications to the tunnel include increasing the vertical clearance, relining the exposed bedrock, improvement and protection of the communication and utilities within the tunnel and the reprofiling of the track.