Devonport Quaylink – T3 Marine & Dredge

The scope of works included:

• Design and certification of the T3 permanent works;
• Berth pocket dredge of approximate 40,000m³ including 8,000m³ of hard rock;
• Reclamation of 50,000m³ to provide for further carpark and road construction areas;
• Berth pocket scour protection works including placement of approximately 2,000 rock bags;
• Construction of a 140 metre x 12 metre wharf structure and two approach bridges;
• Installation of 52 steel marine piles, generally 1067mm dia and up to 40 metre long;
• Supply and installation of approx. 4,100 tonnes of precast wharf elements including headstocks, beams and planks, installed by crane barge;
• Placement and finish of approximately 1,600m³ of in-situ concrete to abutments, pile plugs and wharf deck; 
• Installation of wharf furniture and services including electrical, water and communications, fenders and bollards;
• Remediation of adjacent existing wharf structure including strengthening works, scour protection and new fenders and bollards.

Special Features

The works site is within the operational Devonport East marine precinct and had to allow for continued operation of trans-Tasman ferries and other commercial shipping and logistical operations without interference.

The majority of works were constructed using floating plant including Brady’s crane barge, Rebecca Lily, and various supply barges and supporting vessels.

Varied, challenging ground conditions resulted in a variety of pile installation methods being required across the length of the wharf from simple driven steel tubes in areas of deep alluvials through to rock sockets with cluster drill in high strength, shallow rock areas.

All works were completed either over, or adjacent to the Mersey River requiring high levels of environmental management throughout the works.