Anchored Shoring Wall at Chatswood

We built an anchored shoring wall at Chatswood. It combines 23 bored piles, a reinforced capping beam and temporary ground anchors into rock. Shotcrete panels span between the piles. The piles are 450 mm in diameter and reach 10.4 m.

The project

The wall retains a deep excavation at Chatswood, with neighbouring buildings standing directly above the cut.

Why does a bored pile wall need ground anchors?

A row of piles holds the ground back. On a deep cut, the top of the wall wants to lean into the excavation. Temporary ground anchors tie the wall back into the rock behind it. They carry the load through the excavation and construction sequence.

With buildings above the cut, the wall has no room to lean. The anchors take that movement out of the equation.

How the piles, capping beam and anchors share the load

Each part of the wall has one job:

• Bored piles: 23 piles at 450 mm diameter, bored with the Soilmec SR-45, carry the retained ground down to 10.4 m
• Capping beam: the reinforced capping beam ties the piles into one wall and spreads the anchor load
• Temporary anchors: we stress and test every anchor to the specification
• Shotcrete panels: the panels span between the piles and retain the face between them

The outcome

We completed the wall on 18 August 2026, about seven weeks after starting on 29 June. The piles, capping beam, rock anchors and shotcrete panels hold the excavation with the neighbouring buildings standing above it.

Retaining a cut beside existing buildings

Planning a deep excavation beside neighbouring structures? Email your geotechnical report and wall design to sales@millentcivil.com.au or call 02 4578 0110. We will confirm a buildable wall, capping beam and anchor layout.