Plot M0103, known as The Lighterman Tower, is a residential development located on Greenwich Peninsula. The development contains 225 residential units, including a mix of private, intermediate and social housing. The plot is split into three buildings: a 24-storey tower and two low-rise blocks of five and six-storeys. The buildings are linked by a basement car park and landscaped amenity space at the podium level.
The superstructure is RC frame with flat slabs and blade columns hidden within internal and external walls. Due to the required column arrangement in the car park, there is a transfer slab at podium level. The balconies for the low-rise blocks were formed in galvanized steel, with columns supported at ground floor and balcony steelwork fixed back to the RC frame using proprietary thermal breaks. The tower is relatively slender, therefore a lot of work went into the assessment of the lateral stability. Through our detailed analysis we were able to omit the wing walls we had provided at the initial stages of design, providing greater flexibility of the space and reducing cost.
During the excavation, 265 existing piles were found beneath the footprint of the power station. Consequently, we had to redesign the foundations to avoid the existing piles. In conjunction with the contractor, we agreed an exclusion zone around the existing piles to take account of pile tolerances. Following this exercise, we were able to relocate the new piles based on the proposed column locations. In addition to the existing piles, there was a 13m deep reinforced concrete (RC) pump chamber located beneath the western corner of the tower. Our solution was to use part of the perimeter retaining wall as a transfer structure to span the circa. 16m over the existing chamber.