Large scale repairs to this Grade II historic bridge in the North York Moors including full take down, extension of arch barrels and rebuilding using a combination of new and existing masonry.
Built around 1804, Mowthorp Bridge was extensively altered in the early 1900’s to widen both approaches.
Unfortunately, this was carried out using an unsympathetic mass concrete slab and was in no way in-keeping with the original stonework structure.
Working with PBS construction (Hull) and in conjunction with NYCC, Yorkshire Moors National Parks and Historic England we were appointed with the task of installing new stonework back to the original design, but following the alignment of the widened approaches.
Firstly, we carefully removed all the existing copings, parapet walls and string course to allow access to the concrete slab. All masonry sections were numbered, measured, photographed and safely palletised on site for later reinstatement. Many of these stones had been damaged previously through a combination of bad workmanship in past repairs and general traffic impact damage – this was to be addressed later as part of the rebuild.
After the concrete slab was removed we were ready to start installing the new stonework, this involved toothing into and extending the original arch barrels and voussoir stones using specially fabricated timber formers to carry the weight until the arch was complete. We then installed new spandrel sections and curved cutwater stones using detailed templates to marry up with the original courses and datum points around the arches.
The final stage was to cut the broken ends off the original stored parapet wall stones and re-lay as much as possible onto the bridge.
The shortfall was made up using new stone, locally sourced and tooled exactly to match the original.