10 Fenchurch Avenue, London, EC3M

Saxon Land

72 weeks

£11.2m

London, EC3M

Location & Overview

10 Fenchurch Avenue, located close to Fenchurch Street Station within a busy area of the City of London covering an area of 3,200m2. Demolition of six 22-metre-high buildings. 10 and 12–14 Fenchurch Avenue, along with 117 through to 120 Fenchurch Street, were to be taken down to the underside of the existing single basement slab.

Work, Challenges & Solutions

Both floor-by-floor and long-reach demolition techniques were used for the various types of building construction and also to ensure minimum impact to the surrounding offices.

Removal of substantial asbestos. Installation of a complicated basement temporary works scheme to retain the stability of the existing perimeter basement retaining walls.

Removal of existing foundations to the perimeter of the site to allow for the installation of the secant piled wall.

Installation and maintenance of split-level piling platform, including extensive pile probing and phase 1 temporary works.

Excavation of the site between the existing pad foundations with MOLA in attendance, to a further 2m in depth and the subsequent filling, back up to a piling mat level.

Five live network sub-stations required constant protection to avoid excessive vibration.

Due to the sensitive location, a ‘Real Time’ noise and vibration monitoring regime was installed immediately. Construction of 2no. large concrete culverts incorporating support decking to house the temporary substations and associated cables.

A demolition strategy to allow the Nat West Bank, located within the site boundary, to continue unaffected and operational during the demolition period.

Excavation of 45,000m3 basement to a depth of 8 to 10m. Design, supply and installation of 300t of raking & flying shores to piled wall. Excavation of lift pits and caps, including reverse blinding.

Achievements

Design and installation of an enormous external façade retention system along Brushfield Street.

Early completion of works with minimal disruption to neighbours.