BACKGROUND
The Go Between Bridge is a key component of the multi-billion dollar TransApex project. Trans Apex is designed to cater for expected growth in traffic flow within Brisbane CBD is a well designed, accessible and connected city for now and into the future.
WHAT WE DID
Geotechnical investigation was required to obtain data on the solid geology vital in the design of the bridge foundations.
Client
Brisbane City Council
Duration
Seven weeks spread over two years.
Location
Overwater and land drilling in the following locations:
• Stage 1 – Initial feasibility study was completed in mid 2005. This consisted of 10 land based boreholes, 5 on the West End side and 5 on the Milton side of the river;
• Stage 2 – Preliminary Design was completed late 2006. This involved overwater drilling at proposed pile locations. Difficult drilling was encountered on the Milton side due to rock fill placed for bank stability.
Drilling
Technical Facilitation:
• Drilling using a Hydrapower Scout MK.3 drilling rig mounted in a dumb barge with a four point anchoring system controlled by four independent winches.
• The bores were advanced by rotary mud flush techniques.
• The majority of the soil sampling was undertaken by SPT, with only minimal ‘undisturbed’ push tube samples possible, due to the presence of frequent gravel beds.
OUTCOME
“As a result of the investigation the project was deemed feasible and progressed to contract stage, with construction being completed 2010.”
Gary Bruyeres | Brisbane City Council, Senior Engineer
