Case studies 5 & 6 St James's Square, London

5 & 6 St James's Square, London

Overview

Demolition, Environmental Management, Asbestos Removal, Recycling, Temporary Support Works, Civil Engineering

Client:      Exemplar

Value:      £2.8m

This prestigious project located within the highly respected area of St. James Square London consisted of the demolition of a six storey reinforced concrete brick clad structure down to the top of the existing ground floor carried out within one of the most congested areas of London.
 

Solution

The project involved the careful demolition of the structure down to the top of the existing ground floor slab, with a further package of works to removed the existing double basements and excavate to form a further basement some ten metres below existing ground level.

The demolition contained a number of challenges, one of which was the careful demolition around and partly within the list building of No.5 St. James, with ornate listed plaster ceilings and existing decorative finishes which needed to be protected from dust, water and vibration.
 
The method of demolition around the structure was developed to ensure that all plant contained non percussive means of demolition.
 
The general structure of 5 & 6, St. James contained an abundance of asbestos, which was removed by our in-house approved team whilst the demolition was carried out in a careful manner on a floor by floor basis with the use of a tower crane and mini machines.
 
The neighbouring buildings contain residential and legal offices, which required a sympathetic approach during the demolition works.
 
The congested road network surrounding the site meant that a strict control regarding wagon movement was required. Due to the fact that further demolition projects were being carried out within the local area, it was necessary to liaise with neighbouring contractors to establish a common logistics plan to minimise congestion to the local road network.
 
Needless to say, the project contained a number of specific challenges that needed to be addressed, some of which are listed below:
  • The need to minimise the transmission of vibration through the existing   structure during the course of the demolition.
  • The need to employ ‘munching‘ techniques during the course of demolition rather than the use of pneumatic breaker attachments in an effort to minimise noise and vibration transmission.
  • The erection of a tower crane situated within the middle of the existing structure to ensure ease of loading demolition arisings with minimal disturbance to the local environment.
  • The re use of all demolition arisings within the site to limit wagon movements and the possible affect to local traffic routes.
  • The safe containment of the structure within monarflex scaffolding, acoustic screens and the management of dust transmission within an enclosed environment.
The demolition was carried out very successfully and without incident.  Upon completion of the demolition to ground level, the package was novated to a Main Contractor allowing us to continue the project by executing a major sub structure and temporary works package to form the new basements.

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