Working on a boring project
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Drilling and explosive work is under way beneath Timaru as construction of a $15 million tunnel takes shape for the city's new sewer lines.
Auckland based Harker Underground Construction Ltd has the contract to bore a series of tunnels from Washdyke Lagoon to the Alliance Smithfield access road, directly under Westcott and Richmond Streets, and a third from Ashbury Park to Virtue Avenue.
A specially imported boring machine from the United States will be used to create the tunnels at depths of more than 13 metres.
The first tunnel started at the northern slopes of Bridge Street will eventually run for nearly 400 metres at about three metres in diameter.
Ground conditions being encountered at the moment are half the tunnel height in basalt rock overlain with clay. The rock is being removed by boring and blasting.
The work is part of the main trunk sewer upgrade which will connect to pipes already laid from Station Street through Caroline Bay and those laid around the Washdyke Lagoon and out to where new oxidation ponds will be created at Aorangi Road north of Washdyke.
- © Fairfax NZ News
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