132—142 Hampstead Road, London, NW1
Costain Skanska JV on behalf of HS2
46 weeks
Confidential
London, NW1
Location & Overview
Located on Hampstead Road, buildings 132-140 formed the original BHS warehouse, which was subsequently used by the UCL School of Architecture and Design, with building 142 being a former petrol station. The TFL red route occupied one elevation, whilst Network Rail’s signal box and main railway out of Euston were situated on the other, with the live Northern line underground tunnels below.
Work, Challenges & Solutions
Demolition of 2 separate 3 and 5 double height story buildings down to and including the basement slab, pile caps and foundations.
The removal of asbestos and 2 full 20,000-litre diesel tanks from the basement.
Crushing on-site won demolition arisings, enabling the backfill of the basements up to road level.
Temporary works schemes for the scaffolding, hoarding, crawler crane mat and the retention of retaining walls from the basement to the ground floor.
Installation of steel propping at basement level, utilising the existing strip foundations to negate the need for the installation of thrust blocks.
Structural investigations and floor load testing to allow for the use of 20t machines on the floors.
Interface with Network Rail for hoarding and scaffold design and installation.
Use of a demolition curtain for the removal of the petrol station canopy, due to the tight interface between the footpath and the hoarding.
Achievements
One team approach between HS2, CSJV and John F Hunt ensured completion on time and within budget.
Zero accidents or injuries.
Reduction of 12,000 plant movements due to the on-site crushing of site won material.
Value engineered the basement propping and backfill sequence to reduce the amount of temporary works required to allow for the follow-on piling works.