A45 Wellingborough six schemes into one


A45 westbound carriageway improvement programme was in a very poor condition, surfacing was at the end of its life, safety barriers required replacement, traffic signs needed upgrading and there was flooding on carriageway and adjacent land.


The delivery team applied lean techniques to brigade six individual schemes combining traditional and innovative construction methods.

A number of innovative products were utilised on this scheme bringing efficiency savings safer working environment and increased output. Following recent trials, low temperature asphalt   was used to resurface, allowing more resurfacing to be applied and less cooling time while providing excellent equivalent durability.

A46 Cossington to Seagrave

Reinforcement and moisture barrier systems were used to replace failed pavement, providing high strength, high modulus, fibreglass mesh system reducing the potential for thermal stress related cracks. This new system required less treatment and therefore considerable material and time savings.

Drainage remediation used trenchless technologies; patch lining repairs, structural relining and root cutting to improve the working capacity of the drainage system while minimising disruption to road users. Filter drains were remediated using Carnell’s patented STONEmaster, recycling filtering material on site, minimising amount of new materials required and waste removal.

Stakeholder engagement and management was crucial as the site was in close proximity to a 24 hour distribution centre and flour mill. A unique approach was required for the traffic management strategy to ensure that the high vehicle count was affected as little as possible. A diversion route was agreed via third party land, with additional traffic management on third party land to ensure safe access, egress and movement of traffic and pedestrians.

The site was in close proximity to Nene Valley Gravel Pits which is a site of special scientific interest and home to over 20,000 water birds and includes the largest nesting colony of grey herons in the area. We had to make sure that sufficient pollution prevention measures were in place during construction activities. We applied a filtration system to two ditches which both out-falled into the River Nene and Eco Pillows were used to prevent water leaving the gullies.

Due to the nature and location of the project we anticipated a large number of customer enquiries but the stakeholder management resulted in only five over the duration of the scheme.

Combining the several smaller schemes into one large project provided:

  • Reduced disruption
  • No return for future maintenance for five years
  • A single contact point for stakeholders