Timaru Main Trunk Sewer Renewal

Timaru Main Trunk Sewer Renewal
Client 
Timaru District Council
Details 
3 x 400m drives of 2.5m diameter ring beam and lagging tunnel with multiple curves in each section of tunnel.
Sector 
Infrastructure
Feature 
Ring beam and lagging tunnel through varying ground conditions.
“Extensive planning to avoid uplift and deformation.”

The project involved the construction of a 2.5m ring beam and timber lagged tunnel through ground conditions ranging from soft clays to cannington gravels/boulders and solid basalt.

 

An Akkerman ring beam and lagging machine was used together with an Akkerman EX50 Excavator in the softer ground, and conventional drill and blast methods in the harder ground to complete tunnel construction.

 

Following construction, two PE pipes were pulled through the tunnel length and grouted into place. This operation required extensive planning to avoid uplift and deformation during the curing period. Additional difficulties encountered within the project were curved drives to avoid private land boundaries and stay within the council owned reserve.

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Harker
1 Croskery Road, Papakura, Auckland 2110
PO Box 101 Drury, Auckland 2247, New Zealand

T   +64 9 295 2570
F   +64 9 299 1577