Project Profile: Tipner Interchange Project: M275 Tipner Interchange Bridges, Portsmouth Client: Portsmouth City Council The project: Tipner Interchange Bridges are part of the main gateway to the city of Portsmouth, supporting the M275 motorway. The interchange was designed to accommodate a grade separated junction between the M275 & Tipner, an area that was earmarked to undergo major redevelopment to form the ‘key gateway’ to Portsmouth. Principal Bridge Inspections highlighted leaking deck joints and patch defects in the supporting structures. Concrete testing also confirmed the presence of high chloride ion concentrations. As part of an Early Contractor Involvement scheme (ECI), APA were selected as the specialist contractor to provide practical design assistance and

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