Reuse Of Foundations
Re-use of foundations, certainly in inner city sites, are becoming a typical option that must be considered.
There are several key drivers for this:
- Congestion in the ground as a results several generations of development prevents the installation of new foundations without costly foundation extraction
- Improving record information for buildings allows greater certainty of the quality and geometry of the existing foundation enabling risk to be lowered
- Cost and programme advantages
- Increased programme certainty with reduced risk associated with groundworks
- Huge reductions in the carbon footprint produced in redevelopments.
- It’s the right thing to do!
Waterman have successfully delivered a number of projects with foundation reuse adopted, often employing investigation and analysis techniques and strategies to deliver solutions that justify the existing foundations to carry more load than they have previously, some without enhancement. These include refurbishment and new build projects and have enabled the client to maximise the full potential load carrying capacity of the pre-existing foundation asset.
The ethos that Waterman adopt is to reuse foundations unless there are real reasons why it is not viable or desired.
City of London project 6 Bevis Marks reused existing under ream piles along with a supplementary piles in the foundation solution. Fibre optic strain gauges were installed into piles pre-demolition to monitor the piles to be reused during demolition. When combined with structural and geotechnical investigations and rigorous analysis techniques it was possible to reuse 52% of the existing building by mass in a new-build development. Resulting is a carbon saving well in excess of 1000 tonnes the project won the Ground Engineering Award for Sustainability 2013.