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George IV Bridge

Land Engineering was appointed to reconstruct a new road junction within the Royal Mile, where George IV Bridge meets High Street, Edinburgh. The project involved the full reconstruction of the existing junction using high strength concrete to exacting tolerances, and surfaced using natural stone paving.

Activities

• The works required the excavation of the existing surface to a previously placed layer of CBM2 and construction of a fibre reinforced concrete slab.
• The Duracrete DF70 concrete slab was cast in a number of pours to accommodate existing road profiles.
• The concrete roadbase was constructed to a tolerance of +0/-10mm, with significant performance monitoring to verify strength gain and achievement of minimum performance requirements prior to commencement of the surface layer.
• Granite setts were laid on a polyurethane bedding system developed to achieve the required strength and durability.
• Sett construction presented a challenge, as the concrete formation layer, polyurethane bedding and grouting material had to maintain a moisture content of less than 0.5%.
• The site had to be covered in a temporary waterproof structure to control climatic conditions and create the optimum temperature and humidity.  Materials were stored in a container that was heated constantly and dehumidified.

Outcome

The construction of the junction presented logistical problems in that it had to remain open at all times. Pedestrian movements and footfalls were high, given the location of the junction. As unplanned Scottish Water mains replacement operations delayed the project start, time risk allowances allocated to critical activities were absorbed before we started our work. 

With substantial costs attributed to the delay, we proposed a maximum out-turn cost incorporating incentives for shared savings. Actual costs were reimbursed on an open book basis, resulting in considerable client savings against a traditional re-measured claim approach.

Ultimately, the works were delivered on time – and free from defect on handover. 

Case Study

Click below to download a pdf copy of this case study  George IV Bridge