COMPLEX LOGISTICS TO COMPLETE CONTIGUOUS PILED WALL PROJECT IN HISTORIC LANDMARK
SCOPE OF WORKS: 17 x 5m contiguous bored pile wall utilising 450dia SFA piles
CLIENT: Brims Construction Ltd
CONTRACT: Design and build
CONSTRUCTION PERIOD: December 2022 – January 2023
Built c. 1080, the Norman Chapel is Durham’s oldest building and is located within the UNESCO World Heritage Site of Durham Castle. During its long history the chapel has seen much change in the surrounding area, one of the many changes was the construction of an earth embankment to create a terrace outside of the building over 100 years ago. The method used means that the soil piled against the outside of the chapel is creating damp that is causing damage to the historic stonework and carvings within the chapel.
Aarsleff were contacted to develop a piled solution to allow 5m depth of soil to be removed from the chapel walls and a ventilation system installed to remedy the problem. We developed a cantilevered contiguous bored pile wall using 450dia SFA piles. The wall stretches 17 metres with a retained height of 5m.
Working within a UNESCO World Heritage Site meant the solution had to be low vibration, exclude hot works, could not touch or clash with the building and could only employ small plant capable of accessing the working area. This very restricted access meant we had to cane a mini-piling rig over the castle wall to cross a temporary bridge and then track around the Castle motte.
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