Deconstruction of Allen Court
We were appointed by Linden Homes to demolish Allen Court. Due to it being of Large Panel System (LPS) construction it had to be deconstructed. Prior to using the reverse construction method the building had to have a large amount of asbestos containing materials removed and be stripped back to the structural elements
Scope of Works
- Inner City Environmental were employed to remove all of the asbestos containing materials (ACM’s) from the building prior to the demolition. The ACM’s removed from the building were cement based products and asbestos insulation board.
- Following the removal off the ACM’s the building was stripped back to the concrete structure. All soft furnishings, carpentry and non structural elements were removed. As these elements were removed they were sorted into the different waste streams and sent for recycling.
- The entire building was encapsulated with scaffolding, with a debris fan installed over the access road to the neighbouring residencies. 3 sides of the building were covered in debris netting whilst the 4th (closest to the rail line) was covered with Monarflex. The scaffolding contractor would also remain on site during the deconstruction to strike the scaffold as the building is reduced and to erect the various edge protection requirements once open edges were created. This scaffolding was erected by Inner City Scaffolding.
- To enable the safe deconstruction of the panels, diagonal propping needed to be installed on both the internal walls and the walls that make up the exterior of the building.
- A 90 tonne crawler crane was brought to site and positioned next to the building. This crane was positioned on an engineered platform of 6F2 crushed aggregate. The crane was also fitted with slew limiters to ensure it did not over sail the Piccadilly Line.
- To remove the panels that make up the fabric of the building a small 5t machine would be used to break the edges around the panels. Firstly, small holes would be broken in the top of the panel to allow for lifting chains to be passed through. The edges of the panel would then be broken out and the panel lifted out of the building and to the floor below. here the panels would be processed by a demolition excavator with munching attachment. The steel reinforcing bar was removed from the concrete and sent for recycling.
- As panels are removed certain props would become redundant. These props would be moved to the next floor below and put into position.
- This method of propping and then lifting panels out was repeated down through the building to the 4th floor. from the 4th floor the building was reduced using a standard height demolition machine with munching attachment. Large quantities of water was used to help suppress the dust during the demolition.
- All of the the foundations were removed from the ground and processed into small lumps of concrete. These lumps along with the other concrete arisings created during the project were removed from site for recycling.
Ridding Lane, Ealing, UB6
January - July 2016