BTR Building Services
Labour, Plant, Slipform, Equipment & Management
We provided our fully inclusive package on this scheme, using 200mm walls which require precision pouring to make sure the concrete is placed in the correct layers. The depth of the set concrete needed to be monitored constantly to remove the risk of dragging walls. There was wall adaptions at Level 9 & 20 where some of the walls are reduced. There was also an enhanced finish required on the stair wall. We achieved this by sliding on green concrete which allowed us to make sure that the concrete coming out of the base of the shutter is workable and not hard. We were able to steel float the walls and give them the enhanced finish required by the client. We also had to do extensive concrete trials on this project to cover all eventualities as it was in London. We had a range of 6 mixes that we could use depending on the time of day as the traffic can delay the concrete wagons getting to site and also the ambient temperature had an affect on the setting time. The concrete setting time is key to the progress and the enhanced finish quality. We had the added challenge of constructing a straight wall 15m long with no concrete ties back to the rest of the walls. We had to install a complex arrangement of temporary stability propping each floor while we slide that allows us to bring the wall to the full height of 70m. The rest of the core was made up of 2 lift shafts a stairwell and a large lobby. In total there was 30 men working on this project.