Balfour Beatty Civil Engineering Ltd

A90 Kinfauns Interchange

Client: Transport Scotland
Designer: Halcrow
Value: £13.8 million

The project was the final phase of road safety improvements on the A90 Perth to Dundee corridor and consisted of the design and construction of two grade-separated interchanges, including provision of new side roads, closure of central reserve gaps over an approximate 14km length of dual carriageway together with all associated works.

In common with most projects of this nature, early consultation with SEPA and the inclusion of SUDS (sustainable drainage system) principles within the drainage design created a need for the inclusion of attenuation ponds within the design. In years to come these ponds will provide a wildlife habitat.

The bridge crossings of the A90 followed a conventional form of construction, with simple pad foundations (Kinfauns) or piled integral abutments (Glendoick) built on formed embankments. This was undertaken with minimal disruption to the existing trunk road traffic. During overnight closures of the A90 steel bridge beams and precast concrete cope units were placed.

The lack of alternative routes required that all traffic management on the A90 was minimised and throughout the main construction the existing A90 was maintained without interruption. Throughout the duration of the works Average Speed Cameras were utilised to assist in workforce safety through traffic speed reduction.

To erect the steel beams and place the precast copes overnight contraflows were utilised on one carriageway of the A90 until the lift over the live carriageway started. At that stage 'a rolling block' was used to bring all traffic to a standstill for a short period.

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