Napsbury Lane Bridge Refurbishment

Value: £488,000

NEC3 contracts/options used: ECC Option D

Start-finish dates: 13th July 2015 to 8th Oct 2015

Main project team members:

Employer – Hertfordshire County Council Highways (Richard Dunn);

Project Manager and Client Representative – HCC Highways Whole Client Service (Tom Lambert and Fiona Budlender);

Principal Contractor – Osborne (David Landeryou);

Contractor’s Designer – Aecom

Scope and significance of project: Napsbury Lane Bridge forms part of a grade separated junction on the A414 dual carriageway south of St Albans, Hertfordshire. The bridge was identified as needing new expansion joints, concrete repairs to the deck soffit and repairs to the concrete pier and abutments. The works involved long-term lane closures on this critical East-West Link. Severe disruption and delays were anticipated, making the scheme high impact and politically sensitive.

Please detail how you demonstrated collaboration on your project:

It was important to define the right scope of this design and build project. HCC and Osborne worked together to investigate the causes of the observed defects. Osborne then suggested an innovative hybrid cathodic protection system that not only arrests but reverses deterioration. Once we all understood the projects goals, the next priority was to ensure disruption to the travelling public was minimised. We went through an iterative process of optimising and utilising a mixture of lane closures and night time full closures, whilst also allowing shared road space occupancy and coordination with Highways England and the surrounding road network.

This required careful coordination of the entire supply chain and their activities but brought about value efficiencies for multiple organisations. Throughout the works we maintained a coordinated website and social media publicity campaign to reach as many people as possible and keep them informed.

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