Walter Taylor Bridge - deck replacement - a case study

The increasing deterioration of the 57 year old timber deck of the Walter Taylor Suspension Bridge was causing inconvenience to the public with a poor quality ride and frequent maintenance interruptions. Logistics of replacing the deck were paramount as the bridge provides a vital link across the river and a detour of up to fifteen kilometres was necessary with any bridge closure. A total road closure was considered the only practical method for the 1750 square metre deck replacement with lightweight precast concrete panels. Selection of a precast lightweight aggregate concrete deck was based on minimising weight and reducing construction time. An early completion bonus was used to encourage a reduced closure time and inconvenience to the public. In a fortnight the contractor had removed the timber deck; abrasive blast cleaned and painted the top surfaces of the steel stringers and cross girders; welded shear stud connectors; positioned, grouted and jointed precast panels; replaced wind anchors; installed expansion joints; painted both suspension towers; and undertook associated approach works. Asphalt sealing of the bridge and approaches along with other maintenance activities were undertaken to maximise the benefit of the bridge closure.