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Geographical Regions Covered by Squibb Group

Alkham & Horton Tower Blocks

  • Project Status: Completed
  • Location: Orpington, Kent
  • Client: Hill Partnerships

Description

Squibb Group The Squibb Group were contracted to deconstruct two 14 storey tower blocks in a residential area in Orpington, Kent. The tower blocks were of pre-cast panel construction. Asbestos Containing Materials (ACMs), were removed prior to any work commencing on site. This was performed by our own in house asbestos removal division. Squibb Group demolished the entire site to below ground slab level with all arisings being either recycled for on site re-use or taken off site for disposal/recycling at our licensed facilities.

Key Elements

  • Erect hoarding around perimeter of the site
  • Isolate / disconnect all services
  • Soft strip both tower blocks
  • Complete demolition of both tower blocks to grade
  • Break out all slabs and foundations
  • Break out all car parking areas
  • Crush all demolition material to 6f2 specification and leave on site for re-use

Ultra quiet machines / equipment were utilised due to close proximity to residential homes that comply with European Stage 111A for emissions and noise levels. An eight board scaffold fan with a two board up stand was also utilised so that any debris from demolition workings would be blown back into the site boundary. Dust Busters were also utilised.

Challenges

  • Demolition of blocks in close proximity to densely populated residential area
  • Risk of premature collapse as building is demolished
  • Potential hazards due to noise, dust and intense vehicular traffic

How we made a difference

Working collaboratively with PGCS, our in-house structural engineers, we produced demolition method statements and resulted in the decision to take down one of the tower blocks to the 3rd floor with mini diggers, then reduce the remainder with a High Reach machine. The mini diggers were lifted onto the roof of the tower block by mobile crane.

It was essential that the concrete floors were back propped to take the impact of machines working above. These back props, after structural assessment, were erected two floors below the level of operation. These back props would be removed and re- erected as the tower blocks reduced in height.

Such a structure runs a very high risk of premature collapse, so a temporary propping system was erected to mitigate this possibility. We also designed all permanent works to the adjacent Health Centre which included permanent steelwork and the forming of new retaining walls.