Greenwich Peninsula is London’s largest single regeneration project and when complete will be home to over 15,000 new homes as well as new schools, offices, health services and public spaces. This phase was to deliver the foundations for five new buildings, adjacent to the O2 Arena and overlooking the River Thames.
DESIGN AND PLANNING
The pile layout had to take into consideration the Jubilee Line running beneath the site, with the team opting for a design that avoided the requirement
to install piles in close proximity to the tunnels. The designed solution was to construct a ‘channel’ across the middle of the site which created a safe zone for the tunnel and would ensure any risk of damage was eliminated.
The scheme was delivered in two phases to allow follow-on construction to commence and help reduce the programme. During the first phase the team installed the foundations for buildings 1 and 2. Approximately 650 CFA piles with diameters of 600mm, 750mm and 900mm were bored to a maximum depth of 28m. In addition to this, two CFA contiguous piled walls were constructed to provide temporary support. The walls were formed using 102 piles, which were bored to a maximum depth of 16m.
The second phase involved the installation of the foundations for buildings 3, 4 and 5. In total near 1000 piles were constructed, this included 125 LDA piles and 874 CFA piles. The design for building 5 was altered to use LDA piling under polymer rather than CFA. The solution was changed to accommodate the increased loads from the building and took into account other structures in the vicinity.