| BACKGROUND |
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| 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. |
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| WHAT WE DID |
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| Geotechnical investigation was required to obtain data on the solid geology vital in the design of the bridge foundations. |
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| Client | Brisbane City Council |
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| Duration | Seven weeks spread over two years. |
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| 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. |
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| 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. |
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| OUTCOME |
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| "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 |
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