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Construction challenges likely to extend pipeline harbour crossing work

A series of challenges has slowed progress on the Southern Pipeline harbour crossing project, with a possibility that the final phase of construction work will extend into the new year.

Steve Wiggill, Tauranga City Council Project Manager for the Southern Pipeline, said, “The contractor is working hard to complete the last drilling phase before Christmas but it is likely some work will need to continue in January.”

Mr Wiggill said, “This has been an incredibly challenging project. We’ve been successful in overcoming each of challenges as they have arisen, but the cumulative effect is pushing out the completion of the project.”

The contractor is in the final stages of widening the hole under the harbour with a 54 inch reamer. Drill rods had broken on two separate occasions during the final phase of reaming. Both instances resulted in two-week repair periods and damage to one of the reaming tools.

Mr Wiggill said, “After a successful start, we’ve faced challenges since August when the 40 inch reamer encountered an obstruction under the harbour. It was later identified as a piece of Totara wood, around 51,000 years old. It took the contractor three weeks to overcome this issue. The reamer itself was damaged while being dislodged, and it’s possible that debris from the reamer has compromised subsequent drill runs.

“Since then it has also become apparent that the material we’re reaming through is generally more challenging than the contractor initially thought. To address these issues, we’ve recruited international experts and brought in additional specialist machinery.”

Mr Wiggill said the contractors were working on reinstating the drill rods to complete the last phase of reaming work. Their expert team had also introduced a number of measures to mitigate the risk of the drill rods breaking again.

Once the 54-inch reaming work is completed, a period of between three-to-seven-days of 24-hour work will be required to pull steel pipes through from Memorial Park to Matapihi. This and the thrusting of the plastic pipe through the steel pipe will be the last phase of harbour crossing construction aside from pipe connections at Matapihi and Memorial Park. On completion of construction, the temporary reclamation at Matapihi will be removed and Jordan Field at Memorial Park will be returned to public use.

There is currently no work planned for the Christmas and New Year period. Memorial Park Pool will remain opened as planned, with some small changes to parking and a temporary alternative access office.

There is no forecast change to the overall $99m Southern Pipeline project budget as a result of the timing changes.

Southern pipeline reamer
54 inch reamer being installed


Posted: Nov 17, 2017,

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