Client: Thiess Hotchieff
Location: Chatswood to Epping, Sydney NSW
For the construction of the Chatswood to Epping rail tunnel, Theiss’ design plans required the rail lines to be fixed to a concrete track slab by the use of Delkor rail base plates.
There was 5.5km of floating slabs and 3.1km of DFF drill and grout slabs existing in the tunnel, requiring 96,000 50mm diameter holes to be drilled.
To get the job done in time and to the accuracy specified, Combined designed a fully-automated, multi-head drill rig capable of drilling 16 holes at a time. It was operated by two men and required only 1 x 32amp lead and one waterhose.