Smith & Garratt reached out to MGF to restore Adam Bridge after seeing the success of a previous project.
The bridge received a Grade B listing by Historic Environment Scotland.
Built in the mid-1700s, the bridge has deteriorated because of weathering and time.
The contract with MGF helped to repair Adam Bridge and restore the historic stonework. This enabled it to continue servicing the Marchmont Estate.
The Restoration and Repair of the Historic Adam Bridge
Smith & Garratt
Marchmont Estate
UniShore® provided support to the bridge structure allowing the extensive repair works to be undertaken while securing the remaining structure.
The restoration required the removal of the road and overburden on the arch to facilitate the extensive repairs to the bridge and its parapet walls.
The stone arch structure and abutment walls needed to be propped both around the arch and across the springing points. This was to prevent movement while the bridge deck was removed and works undertaken.
The riverbed was checked and found to be rock suitable for use as a foundation for the system, avoiding works in the river. A UniShore medium-duty spreader beam was used to support vertical and horizontal components to form a base for the arch support.
The supports in the river were minimised to avoid obstruction to the water flow, as Swarton Burn regularly floods during wetter periods. Allowances were made for potential impacts on the props from debris in the flooded river.
Horizontal propping to the arch springing point was provided by adding screw jacks to the horizontal top member of the frame. This prevented the abutment walls moving together and “bursting” the arch when the road deck and fill were removed as part of the repair works.
UniShore light props were installed with header beams following the line of the arch to provide support and prevent any movement of the stones during the works to the bridge deck.
Working closely with our client, the MGF structural support team created a solution that met a series of requirements.
The combination of UniShore light and medium sections created a solution that minimises interruption to the river flow. There were no required works on the riverbed.
Standard UniShore light-duty components provided the flexibility to create the arch support. The low component weights reduced risk and programme time while being installed under the bridge. This allowed work to restore this historic structure to continue.
UniShore® Medium is a medium-duty, modular shoring and propping system that can be handled manually when necessary, combined with bending …
UniShore® Light is a lightweight, modular shoring and propping system that balances the need to minimise component weight, reducing risk …
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