The site was divided into two phases as indicated on the site plans; this was to enable the construction phase of the works to start as soon as possible. The duration of the work was planned as six weeks for phase one and four weeks for phase two. The two-phase areas were split using Heras fencing. To keep the local community informed, the surrounding commercial and residential properties were notified of the pending demolition by hand delivered letter.
A CAT scan for live services was undertaken before work started and a drop zone created using Heras fencings with signage attached.
Operatives, that were tasked with carrying out soft stripping, were instructed to work in teams of not less than two operatives at any one time. No power tools were used during the soft strip process, only bars and sledgehammer.
Prior to commencing works, the structures were inspected by the site supervisor for any hazardous waste such as sharps, needles, gas containers or chemicals.
Loose contents from within the structure, including furniture, appliances, loose waste etc. were removed by hand in a controlled manner and arising’s managed in accordance with the Site Waste Management Plan. Door frames and skirting boards were removed by using bar and sledgehammers and all nails and fixings were removed from the walls. Once this was done and the Asbestos sheeting had been removed from the roof by fully qualified operatives, then the demolition and dismantling of the structures could start.
Dust suppuration equipment was set up next to the demolition excavator to minimise any dust emitting from the site. The 360-demolition excavator, with a sheer attachment, was positioned at the rear of the structure, all voids in the ground such as manholes, and sewers had been back-filled to ensure the ground was suitable. Deconstruction of the structure commenced by removing the cladding to the end of the building, this was removed by the excavator and material generated was stock piled away from the demolition area.
Using the hydraulic sheer attachment, the roof purling’s were cut back to the next supporting roof beam allowing.
The demolition excavator then removed the concrete frame, generated from the above process, and stockpiled away from the working area. Each piece of steel and concrete was thoroughly inspected for any remaining asbestos cement.
Throughout the operation, the area was thoroughly wetted with the use of water hoses to continually ensure minimum dust release.
All hard-core was stockpiled on site until all the buildings had been removed.
Starting at the edge of the buildings slab, the excavator with bucket attachment lifted the slab in large pieces, ensuring the ground below was not disturbed. Once the slab had been lifted, the excavator returned to the edge of the slab and dug around the first foundation.
The foundation was lifted out and stockpiled ready for breaking. The area of ground from where the foundation had been removed was then back filled and tracked in. This process was repeated until all foundations had been removed. Once a stockpile of concrete had been generated, a second excavator with breaker attachment then proceeded to break the concrete into pieces no bigger than 500cm2. The Mobile Crusher was operated in accordance with the Safe Operating Procedure, as stipulated by the NFDC.
Arisings were crushed to 6F2 graded concrete, loaded into a dump truck and taken to the working area. The dump truck tipped each load and the excavator spread the 6F2 out to a depth of 300mm thick across the required area.
Once the area had been spread with 6F2, the excavator tracked over it to lightly compact the area.