McNab Constructions


Newstead, Brisbane
Queensland, Australia


Diaphragm wall and driven precast piles; low head room requirements

The W4 Apartment Project comprised the re-development of the Heritage listed W4 Woolstore building in Newstead. The project involved the demolition of the internal building structure and installation of internal strutting and bracing to retain the heritage listed building facade.

Wagstaff Piling designed and installed a diaphragm wall for the two-level basement retention system. The diaphragm wall was installed in low headroom conditions with a maximum of 10.4m working height. The wall was installed with a Llamada low headroom machine and small service crane.

Driven precast piles were utilized for the foundations for the building. All piles were installed using a low headroom Banut rig driving short section precast piles with pitched lengths ranging between 21-24m. All piles were installed with a 6t hydraulic hammer and PDA tested to confirm that geotechnical capacities were achieved. The project was completed on time and budget for the client.

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