Bridge 47, Mangamahu Road

LOCATION Bridge 47, Mangamahu Road, Whanganui    PRINCIPAL Whanganui District Council    PROJECT DATES April 2008 to December 2008

Design and construction of a 90m long arch bridge over an existing waterway. Works included insitu concrete abutments, 600 dia x 35m long bottom driven steel tube piles, new road realignment involving 1500m2 of pavement/seal, associated earthworks, drainage and significant traffic control.

Programme:  The project was completed 4 months ahead of the client’s expected completion date due to CSL’s innovative design demonstrating our ability to construct complex structures in remote locations within tight time frames.

Budget:  The alternative design proposed by CSL and their bridge designer, Holmes Consulting Group, resulted in savings of $0.7M to the client.

Quality:  Project Quality Plan was drawn up and observed in accordance with the company’s AS/NZS ISO 9001:2008 certification. There were no significant defects requiring remedial works. The innovative design and construction led to the project being awarded an ACENZ Gold Award.

Health & Safety:  The Health and Safety Plan was implemented and observed in accordance with the company’s secondary level requirements for ACC WSMP. There were zero LTIs or serious incidents.

Environmental:  The Resource Consent had restrictions on access to the river bed during the fish spawning seasons. Our design of a single span allowed for all works to be carried out without encroaching on the water course. Appropriate environmental protection measures, such as silt traps and spill procedures, have ensured that all activities have been safely carried out within the environmental requirements of the consent. There were zero environmental incidents on this project.

Traffic Management:  A specific traffic management plan was produced for this project. The project required that we operate on and adjacent to the existing highway with a temporary bailey bridge used to divert traffic. There were zero traffic incidents on this project.

Public Relations & Co-operative team approach:  The highest level of co-operation between all stakeholders was required to ensure that the optimum bridge design was adopted, and the maximum use was made of the low traffic times to complete the works within the programme period.

Management/Administration:  All aspects of management requirements were met including reporting, communications, financial control and risk management.