Enigma is the scaffolding subcontractor supporting Future Valleys Construction, who are responsible for delivering the project. We are providing temporary access, to strengthen and widen the Taf Fechan viaduct bridge at Cefn Coed, situated north of Merthyr Tydfil. The three-lane carriageway concrete bridge between sections 5&6 will be widened to create a new dual carriageway and footpath, to carry the new A465 road.
The temporary access solution enables the primary contractor to conduct inspections and repairs to the arches, soffits and piers while permitting the installation of the steelwork to support the cantilevered road widening section for the new traffic lanes above.
The stillage fittings bins containing scaffold materials and banded packs of boards used to construct the birdcages were transported to the embankments underneath the bridge by rough terrain forklifts. Initially, the light-duty access scaffolding was suspended off band and plate temporary hangers attached from the bridge top to install the anchor points, then dismantled after installation. The cantilevered sections were assembled on the bridge, because it’s more practicable to pass from the top down when working at height. However, this meant temporary road closures were needed so materials could be safely passed from the top of the bridge to reduce manual handling.
Subsequent scaffold structures have been erected underneath the existing bridge to provide access for necessary inspections at pre-located areas around the viaduct. All the scaffolds were built ahead of the programme schedule and helped to secure additional works to install bridge access scaffolds, abutment access platforms and retaining wall guardrails.