London Victoria Station Upgrade | CFA Piling | Vibro | Keller UK

London Victoria Station Upgrade

Keller carried out the UK‘s largest ever Jet Grouting project as part of a £700m scheme to upgrade one of London‘s busiest rail interchanges. The scheme involved the use of Building Information Modelling, as a system for plotting services, tunnels and grout columns in four dimensions ensuring accurate planning of orientation and length of columns to avoid a myriad of services beneath the site.

At Victoria, the District and Circle Line meets the Victoria Line and the scheme involved the construction of a new ticket hall and underground walkway to the mainline station. Much of these new structures are to be constructed at the level of the interface between the  London Clay and waterbearing Terrace Gravels. Additionally, the site was surrounded by numerous fragile listed buildings and one of London's important theatres.

Keller initially carried out a trial at the site in 2008 to prove the performance of Jet Grouting. Work on the project itself began in October 2011 and lasted until 2014. The primary aim of the scheme was to provide a 2m thick annulus around all of the proposed tunnels and so allow safe excavation through solid ground. This was done by installing overlapping columns ranging in diameter from 1.4m to 1.8m to depths up to 14m. The grout columns were installed to achieve a target strength of beween 1N/mm2 and 10N/mm2.

One of the most complex parts of the project was the careful measurment of the orientation of the drill string using GPS sensors at the top and bottom of the masts in order to achieve the required 50mm tolerance. Additionally, column diameter was monitored by thermal degradation, a technique used by Keller in Austria and Germany. All of this information can be entered into the BIM Model to ensure quality control.

Excavation of the early shafts was successful and allowed for the installation of 2500 Jet Grout columns.

System: Soilcrete Jet Grouting

Client: Transport For  London

Contractor:Taylor Woodrow BAM Nuttall

Engineer: Mott McDonald

 

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