Whenuapai Pump Station

Watercare Services Ltd

Location: Auckland, New Zealand
Value: $6M +
Completed: 2014

Description

Construction of a large underground pump station and storage tank at Brigham Creek Rd, Whenuapai.

The project timeframe was extremely tight and requires thorough planning and coordination of critical activities.

Involved extensive temporary works, construction of concrete walls up to 7.7m tall, mechanical and electrical installation, siteworks and landscaping.

Expertise

Earthworks; Erosion & Sediment Control; pump station construction; deep excavation; precast concrete; mechanical installation; electrical installation

This project followed the Hobsonville PS 70, and is located on Brighams Creek Rd. The design is similar to Hobsonville PS70, except that it has one wetwell and drywell, and is deeper at 7.7m.

The deep section of the excavation was retained using a shotcrete wall, and over 300 soil nails. The shallow section used more conventional timber retaining. As the pump station is founded on rock, only tension piles were required, and these were double reidbars grouted into 400dia piles. The structure consists of precast panels stitched together with heavily reinforced infill joints.