The works for the project involved water main, sewer and road construction works.
The water main works were undertaken on Harbour Drive in one of the busiest parts of the city. The works included connecting to an existing water main and providing a new 200mm diameter fire service to the new CODA development. Challenges included having to undertake the works at night, deep excavation to navigate crossing underneath existing services and removal of old underground footings.
The sewer works consisted of approximately 155m of new 225mm diameter sewer main on Castle and Vernon St to service the new CODA development. Part of the sewer was underbored and manholes were constructed in-situ. Challenges included, working in a busy part of the city, deep excavation, shallow grades of installation and tapping into a live sewer.
The road works portion of the project included kerb and footpath construction on Vernon St. There were various different grades in the footpath to contend with and curved kerbing which added complexity to the works.
150m long concrete cantilevered footing retaining wall. Due to landslips and deterioration, the client required a robust and aesthetically pleasing solution. This project was delivered within a ten-week program and finished off with V drains and guardrail.
Coastal Works delivered the construction of a new concrete roundabout at the intersection of De Havilland Way and Hogbin Dr to facilitate easier and safer access into and out of the Coffs Harbour Airport precinct. The project included foundation strengthening over poor saturated subgrade; new stormwater lines; upgraded lighting; fibre reinforced concrete base; concrete subbase and deep lift asphalt approaches, complemented by landscaping and finishing works. Despite the complexities of the site and maintaining traffic flow for approximately 30,000 vehicles per day along Hogbin Drive, the project was successfully completed on time and within budget.
The project involved the replacement of 3x old, multi-span wooden bridges with new concrete structures, removing the existing bridges and upgrading the road alignment. The structures were designed to incorporate Coastal Works own custom precast concrete girder units, along with precast kerbs, deck panels, and wingwalls.
The new structures for Joyces Bridge, Hobarts Bridge and Justins Bridge will provide increased flood resilience to residents of Darkwood Rd and maintain a reliable, safe crossing for road users and emergency services to the Darkwood valley.
One especially challenging aspect of the project were the stringent environmental controls and hard project deadlines for working in the waterway due to the presence of various endangered and threatened species. These deadlines were met despite multiple flood events.
Watagan Bridge was constructed as a 14m long dual lane bridge utilising PSC precast planks with castellated kerbs and approach slabs. During construction, a temporary bridge was installed to maintain local traffic. The new bridge was raised 1m for flood immunity including 200m of road pavement works to tie in the approaches.