NOTTINGHAM CITY COUNCIL Demolition
Sandfield Centre, NottinghamConnell Brothers were appointed as demolition contractors for the demolition of the Sandfield Centre, in a predominantly residential area in the centre of Nottingham, which comprised of a mixture of single and two storey buildings, including traditional construction, Clasp Mark 6 buildings and a steel framed garage building. A large amount of asbestos containing materials were present throughout the buildings and in below ground service ducts.
The initial works comprised establishing the site and removing the loose rubbish from the buildings to enable a planned sequence of asbestos removal works to be undertaken by Connell Brothers in-house asbestos removal specialists.
Asbestos removal works progressed down the site and as each building was completed it was subject to rigorous testing prior to the issue of a reoccupation certificate, enabling the operatives to return to the building to complete any outstanding soft stripping works prior to demolition commencing.
During the works previously inaccessible areas were opened up and samples taken of the material found. In several cases these samples were found to contain asbestos. The client was immediately informed and these areas were then incorporated into the asbestos removal works to minimise any potential delay to the demolition works.
The demolition of the buildings was carried out using specialist demolition specification excavators equipped with a variety of attachments.
The single storey buildings were demolished first using an excavator equipped with a grab to remove the timber roof structure and lay it to one side for recycling. Brick walls were then removed and the arisings sorted into individual waste streams to minimise the amount of material sent to landfill.
The hard arisings (brick, stone, concrete etc.) were placed in stockpiles for crushing on site and use in the final phase of the works,
The main school building and part of the kitchen were two storeys high and of a CLASP Mk 6 construction. These buildings contained a significant amount of asbestos materials both within the main structure and in below slab ducts. In addition the gable end of the main school was in close proximity to the site perimeter and required particularly careful demolition.
During the course of the demolition of the CLASP buildings the works were halted and specialist asbestos removal operatives carried out a visual inspection of the arisings to ensure that no previously unknown hidden asbestos materials were present.
Main School Block (CLASP Building) and Kitchen (Partial CLASP Building).
The ceilings internally are mostly plaster and machine made mineral fibre, the walls
Initially the main theatre building was to remain but during the course of the works Connell Brothers were instructed to carry out its demolition. Asbestos materials were found to be contained within the building and suspected to be located within underground service tunnels beneath the building. Additional investigations were carried out and these suspicions proved correct requiring an extensive regime of asbestos removal to be carried out prior to demolition of the building.
The main theatre building consisted of a timber roof with brick walls and a timber floor over the below ground service tunnels. In addition the rear of the building was in close proximity to the rear gardens of adjacent houses. Demolition was carried out from the gable end in stages with a section of the roof being lifted off and placed to one side for recycling. The first section of timber floor was then removed and the external walls pulled inwards to fill the basement area and allow the excavator to move forwards and continue the demolition works.
Following the demolition of the structures a mobile crusher was brought to site and all suitable hard demolition arisings were crushed to a suitable grading for reuse within the works. Commencing at the top of the site excavators equipped with hydraulic breakers systematically removed the ground floor slabs and foundations to all the buildings. As the slabs and foundations to each building were removed the voids were backfilled in layers with compacted crushed materials from the demolition works.
The entire site was then graded using the crushed material to leave a hazard free area for the following development works.
As part of Connell Brothers commitment to developing and raising the profile of the demolition industry within the construction sector as a whole the Institute of Demolition Engineers (of which Connell Brothers have several members) arranged for a site visit for members of the Chartered Institute of Builders (CIOB). The visit gave the members of the CIOB the opportunity to observe at close hand the various techniques employed in demolition as well as the wide variety of plant and attachments utilised for various specialist tasks.
The visitors also expressed an interest in the procedures adopted throughout the project and the detail produced in method statements and risk assessments to ensure the safe completion of demolition activities. They also gathered a greater understanding of the procedures to be followed prior to site works getting underway with the legal obligations such as Section 80/81, notifications to HSE, Asbestos surveys and service disconnections, etc.