Majura Parkway Bridge, Canberra ACT
Nathan contracted to Fulton Hogan for the construction of two bridges and median barriers on the Majura Parkway Upgrade project. The scope of works included concrete FRP works for the abutments, wing walls, cross beams, deck and concrete barriers, landing of Super T deck units and installation of precast concrete barrier parapets. In addition to the bridges Nathan constructed 822m of cast in-situ non-standard concrete barrier. Nathan also provided FRP labour to assist with the completion of other major bridge structures on the project Two Launch bridges.
- Detailed construction of the abutment. The twin bridge abutments were designed with multiple changing splay buttresses, which were cantilevered to provide support for the Super T’s. Nathan designed a complex form work system to achieve the cantilever design, and to maintain a class 2 finish.
- Interaction with multiple work disciplines. The project construction program was tight, hence multiple trades were operating in close proximity to each other. Nathan innovated its work methodologies to achieve maximum flexibility, so that work crews could be quickly relocated when work faces were not available. This was particularly critical with construction of the median barriers; Netherless, Nathan was able to meet the required construction program.
- Low temperatures: with temperatures in Canberra regularly dropping below zero, the available window to pour concrete and achieve the B80 project specification was significantly reduced. In addition, the cooler temperatures increased the time in which concrete would reach strength and therefore prolonged stripping times for formwork. In order to mitigate lost time, techniques such as the use of heaters in the form systems, staggered working hours and mix accelerators were utilised.
- The construction of the twin bridges and other associated concrete works were constructed within the contract program and tolerances specified in the NSW RMS B 80 specification.
- Nathan’s performance of the works lead to Fulton Hogan extending the contract a further 4 months and to their use of Nathan labour to complete remaining sections of the project.
Facts & figures
Contract duration: 70 weeks
Workforce: 25 form workers, reo fixers and concretors; 2 crane and plant operators;
Quantities: bridges formwork and concrete 1218 m3, Reo 203T.,
Plant and equipment utilised: site cranage included a 20T Franna, 200T Slew, 36m and 65m concrete pumps, 350T crane for placement of precast beams.