For the abutments, PERI’s design team looked at how the formwork panels could be tied together without compromising the finish. The solution was to install ties and walers from the back of the panels to minimise the visual impact on the concrete surface.
Along with the finish, the rate of rise and access requirements for pouring and installation were factors that determined the temporary works design for the tallest abutment which is 14 metres high. Larger formwork ties and additional walers were used to withstand a pressure of 80kN per sq m and achieve the 3-metre an hour pour rate.
PERI UP’s adaptability was crucial for the construction of the abutments. The cantilever brackets allowed us to get closer to the wall, so we could install the reinforcement followed by the formwork which was crane-lifted into position once the brackets were removed
Access scaffolding has also been instrumental in prefabrication work. The PERI UP system was used to facilitate the build of reinforcement cages in a different location on site before they were repositioned in situ by crane.
Scaffolding has also facilitated the construction of the Taf Fawr bridge deck, with a 30m-high PERI UP 75 stair tower erected to provide an access point for Tecozam’s traveller system. A smaller staircase will connect the traveller to the main platform to support pouring operations.
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