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Bedhampton Gyratory Highway Improvements

Client: South East England Development Agency (SEEDA)

Value: £3.5m

Contract: ICE 6th Edition

Improvement works to facilitate the traffic flow through the Bedhampton Gyratory. Works comprised traffic signalisation, carriageway / roundabout widening, construction of new left turn lane, footpath and cycleway works.

 

The project delivered improvements to the existing highway network through the Bedhampton Gyratory by increasing the capacity for vehicular traffic on the existing roundabout and adjacent slip roads. This was undertaken to facilitate the development of surrounding business parks and enable the highway network to cope with the increased traffic flows. The works comprised widening of the existing carriageway and roundabout, footpath and cycleway construction, construction of a new left turn junction, and associated drainage and landscaping works.

The project comprised the following construction elements: site clearance, traffic management, street lighting, street furniture relocation and installation, traffic signal installation, drainage, carriageway widening, cycleway construction, safety barrier installation, white lining and anti-skid surfacing.

The project was delivered in five main phases of work to minimise disruption of the highway network.

Value Engineering

Dyer & Butler proposed and constructed an alternative asphalt reinforcement solution in lieu of full carriageway re-construction which saved on the full depth excavation, placing the capping layer, the sub-base layer, and the base course of tarmac. The alternative solution provided a cost saving of over £45,000 and a time saving of approximately 3 weeks.

 

Our project management team excelled in targeting solutions to achieve a sustainable construction and provided a key example of working toward Dyer & Butlers WRAP initiative. Some of the key initiatives are detailed below:

  • All waste streams were fully segregated and managed in compliance with our ISO14001 accreditation
  • All concrete used during the project lifecycle was sourced from a recycled aggregates
  • All excavated tarmac and concrete was segregated and sent for recycling. 100% of the 104 tonnes of concrete waste generated on the site was recycled
  • All imported aggregate was recycled
  • We imported suitable waste material from other local projects for use as granular fill material reused on site

 

The value of the project and scope of the works increased by over 100% compared against the tendered Bill of Quantities. Dyer & Butler engaged an active management style to accommodate increase in scope to meet key deadlines and minimise impact on the expanded programme of the works.

Dyer & Butler coordinated and managed the Section 278 agreement with the Highways Authority and Hampshire County Council. We held regular meetings between stakeholders to ensure that issues were effectively communicated and resolved at the earliest opportunity to reduce the potential for delay to the construction programme.

Night time working was a major aspect of the project. We undertook off peak works to minimise disruption to the highway network and to consolidate the construction programme for a timely delivery of the completed project back to the client. We needed to carefully manage the interface between day time and night time working shifts which included daily phased handovers to ensure that vital information was communicated between the project management teams. We also ensured that our operatives did not exceed safe hours and were provided adequate resting periods between shifts.

Due to the nature of the project and large surface areas we realised that creating ramps and steps in the surfacing construction was an issue. As mitigation we planed, regulated and infilled the surface course each night.

We installed ducting and drainage pipework using a trenchless technique at several locations under the existing carriageway which negated the requirement for lane or road closures and disruption of the highway network.

Directional drilling also reduced the impact of the duct installation on the carriageway pavement thus maintaining its original lifespan and not introducing weaknesses associated with open trenching.

 

 

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