The alternative design proposed by L+R resulted in significant time and cost savings for the client, LBBJV. The design contract was also extended to include the foundation design for the superstructure which housed the 200 tonne gantry crane and other cranes used for loading out material, machinery and ultimately the TBM’s.
Initially the riser shaft was constructed to a depth to allow the road-headers to be lowered and begin tunnel formation on the relatively tight curves to the SE Freeway and also for the air vent shaft. The TBM’s, when they broke though into the riser shaft from the north, were partially disassembled and the gantry crane lifted the parts to the surface level or in to the tunnels for extraction on to the SE Freeway.
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