Key Project Details
ClientWhangarei District Council
Opus international Consultants, Whangarei Office
ContractorFulton Hogan Northern Civil Ltd
Project Value(Commission and Physical Works of Bridge only)
Duration(Start – Completion Date)
The design was carried out in early 2010
Physical works were completed in August 2011
The Porowini Avenue extension bridge is located in the suburb or Morningside, Whangarei. The bridge connects the existing Porowini Avenue to Okara Drive situated on the northern side of the North Auckland Line (NAL) railway.
Novare Design was part of the successful design and build team that tendered this project for the Whangarei District Council. Novare carried out the tender and detailed design based on the principal’s requirements prepared by the Whangarei District Council and OPUS International Consultants.
The form and geometric layout of the bridge is very similar to the specimen design produced by Opus, and satisfies the principal requirements by providing:
The superstructure consists of 5no. modified NZTA 1225mm deep super-tee beams with an in situ reinforced concrete deck. This structural form is similar to the principal’s specimen design, although one less beam was utilised. All beams are equal depth and are cast directly into the in situ concrete abutment caps, negating the need for supporting bearings. The outer edges of the superstructure have TL4 rigid concrete barriers to provide vehicle impact protection.
The substructure consists of 3no. x 760mm diameter steel encased reinforced concrete piles per abutment with an in situ concrete abutment cap. Piles were driven into the foundations by bottom driving techniques and were subsequently backfilled with reinforce concrete. In situ pile caps incorporate the supertee bridge beams, producing an integral bridge abutment.
Precast concrete abutment wing wall panels were installed to retain the light weight EPS backfill approach embankments (approach embankment design and construction by other party). Train impact protection was provided to meet KiwiRail’s requirements to protect the bridge piers from potential train collisions.