Case Study
Harvey River Bridges and Mayfield Drain Bridges
Main Roads WA - Project Management (Cimeco)
Project Overview
In November 2008, Cimeco Pty Ltd was awarded the contract for construction of five insitu bridges as part of the 70.5km Kwinana Freeway extension by the Southern Gateway Alliance. The scope of works included the construction of two Bridges across the Harvey River and three Bridges across the Mayfield Drain.
The $677m Kwinana Freeway extension and Forrest Highway construction was a dynamic and challenging infrastructure project, involving the design and construction of 70.5 kilometres of dual carriageway from Safety Bay Road in Baldivis to Old Coast Road in Lake Clifton.
The project comprises 32 kilometres of freeway from Safety Bay Road to South Yunderup Road with the remainder of the route, the Forrest Highway, a rural highway. The entire route is continuous dual carriageway, with two lanes in either direction.
In total, 19 bridges were constructed to grade separate the interchanges and extend the Kwinana Freeway extension over the Serpentine River, Nambeelup Brook, Murray River/Pinjarra Road, and the Forrest Highway over South Yunderup Road, Harvey River and the Mayfield Drain.
Allied Project’s Role
HARVEY RIVER BRIDGES
The bridge at Harvey River is a two span structure with concrete abutments, a central pier in the middle of the river and a pre-cast concrete beam deck. Each bridge (north and southbound) is approximately 60 metres long and has six beams weighing in excess of 100 tonne each. The beams were lifted into position using 250 tonne cranes.
MAYFIELD DRAIN BRIDGES
Located on the cusp of the Shires of Murray and Waroona the three bridges which are required to navigate over the Mayfield Drain are located just north of the future Old Bunbury Road intersection. The southbound bridge is 23 metres and the northbound bridge is 31 metres long. The third bridge to the west forms part of a service road and is separate to the main highway. The Mayfield drain bridges required 11 T-Roff concrete beams to form the decks, which ranges in weight from approximately 80 to 105 tonne each.
Cimeco / Allied Projects worked closely with the Southern Gateway Alliance through all phases of the bridge construction contract and met or exceeded requirements on several fronts. Initial possession of site was granted after approval of all management plans for Safety, Environment, Quality, Human Resources and Construction Methodology. These plans were developed to comply with the projects overall management system and applicable legislative requirements. Industrial Relations and Employee relations plans were developed to align with the projects industrial agreements made between the Southern Gateway Alliance and trade unions.
Prior to mobilisation to site all plant and equipment were systematically inspected for compliance to requirements and meeting safety standards. Registers were established to track and record details of all plant, equipment and personnel involved.
Approval for commencement required work activities to be broken down into work packages with safe work method statements, lift studies and job safety analysis development for each work package. Project engineers in conjunction with the relevant construction supervisors developed these packages and worked closely with the Southern Gateway Alliance through the review and sign off process.
