ONGOING INDUSTRY COLLABORATION PROVIDES AN INNOVATIVE AND ROUNDED KING POST WALL SOLUTION
SCOPE OF WORKS: 133.5m king post wall, Retaining up to 3.7m
CLIENT: Vistry Partnership
CONTRACT: Design and build
CONSTRUCTION PERIOD: March – April 2023
Aarsleff Ground Engineering were contracted by Vistry Partnerships to install a 133.5m king post wall at the top of their Birtley development in order to allow excavation for gardens and house foundations to take place. The wall is retaining up to 3.7m and will be timber cladded once complete, forming a desirable ‘garden fence’ effect to the rear of the plots.
Due to early engagement from the client, Aarsleff’s design engineers were able to value-engineer the scheme, increasing the spacing of the king posts to reduce both resources and time. As the posts needed to be pre-bored, a reduction in posts overall not only had an impact on cost and the overall emissions of the project, but also reduced the time needed at both the drilling and post installation phases.
MGF’s involvement came from their long-standing working relationship with Aarsleff, they were asked to collaborate with the Aarsleff team on a solution which looked to provide a temporary panel design that would allow for the king post solution to be installed.
This wider spacing and the use of narrow UC203 sections meant that the typical precast concrete infills used for king post walls would be too thick to fit. During the design process, both teams worked collaboratively to design a more cost effective and sustainable solution than the standard concrete infill panels. Looking at a range of options that were available, the teams opted to use MGF KKD 600/8mm trench sheets in a horizontal application, with the sheets overlapped and welded to the king post sections. Where bending moments within the thin panels were too high for a single sheet, the risk was easily mitigated by doubling up the sheets. This allowed for more flexibility on the scheme as well, as the sheets could be cut on site if needed, and are quicker to source than precast panels, allowing us commence work on site earlier.
“Birtley has been a rewarding project to be involved with and presented specific challenges. Temporary works had to be managed closely to ensure the safety of Aarsleff welders while fixing panel support brackets to the post below formation level. Due to the large retained height and top down construction method trench boxes were used in a unique way as temporary support panels. These were lifted behind the posts, retaining the ground in the temporary condition to enable the installation of infill panels at each bay.”
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