Tasmania’s first CFA secant piling, delivered at Davis Street

A new underground pump well and overflow storage tank for TasWater at Smithton, built inside 84 intersecting piles socketed seven metres into siltstone.

Delivered for the TasWater Capital Delivery Office through the CPB UGL joint venture, the Davis Street Sewage Pump Station package ran from January 2024 to practical completion in April 2025, about 66 weeks on site. BridgePro’s scope covered the secant piled shaft, the ring beam, confined-space excavation, the base plug, bottom and intermediate slabs, perimeter formwork with HDPE lining, dividing walls, inlet and outlet connections and the top lid with access hatches.

The shaft is formed by 84 secant piles, 42 soft and 42 hard, alternating, each 750 mm in diameter and 13.25 m deep with a 7 m socket into siltstone. They were installed by the CFA method using BridgePro’s Soilmec SR-75, the first CFA secant piling application of its kind in Tasmania. The same methodology was later carried to the Macquarie Point pump station in Hobart.

The project was directed by Aaron Brimfield with Jack van Ek, Matthew Jordan, Harsh Mehta, Femi Joda, Tony Martens and Les Chalmers. Read the project page.