Project Hobson, Auckland

Project Hobson comprised the construction of a 2.3km long segmentally lined TBM tunnel at 4.35m OD (3.7m ID), a new underground pump station and 2 drop shafts.

Our design scope comprised the temporary works design of the excavation support of four shafts up to 35m deep and 23m diameter with rock bolt stabilisation.  Temporary works design of tunnel excavation design for 4.8m diameter conventionally excavated tunnel sections in ECBF and cross passages.