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UK
Transport for London
Dragados (SA) UK
Bank and Monument Stations in the City of London form the fourth largest and third busiest interchange on London’s railway network. The station is a complex interchange for the District, Circle, Central and Northern lines, the Docklands Light Railway and the Waterloo & City Line. The station caters for 350,000 people per day and up to 100,000 people during rush hour, with passenger volume increasing 38% since 2008 and future growth projected.
While there are sufficient entry and exit points to the stations, narrow tunnels and platforms combined with a lack of step free access meant significant congestion with conflicting passenger routes through the stations.
Transport for London devised an ambitious and technically complex £655m expansion plan to improve capacity through the interchange, improving connection and journey times, reducing congestion and introducing new step-free access locations.
The new works revolved around the new Northern line southbound platform and connecting tunnels (600m long), a triple escalator to the DLR, two triple escalators to the Northern Line, new station entrances and step-free access as well as considerable temporary works to facilitate the connection with the new running tunnel. The newly refurbished station was completed in 2023.
OTB Engineering considerable expertise was perfect for the scheme requirements: in depth of experience working with TfL and extensive experience of metro infrastructure projects, combining state-of-the-art latest methods with traditional techniques, working in confined, congested and complex urban subsurface environments, managing multiple asset owners and stakeholders and applying specialist understanding of design risk, opportunity and constructability.
OTB Engineering was responsible for the independent category 3 checking of the structural capacity, serviceability and compliance of all the tunnels and shafts constructed in SCL (sprayed concrete lining) and in-situ concrete, water resistance, squareworks and temporary hand-dug timbered tunnels.
Furthermore, OTB was responsible for carrying out the detail Gate 4 design of Permanent works structures to form the new connections between the new SCL tunnels and the existing station structures. OTB was also contracted to carry out the detailed temporary works design including construction sequencing to enable these new permanent works structures to be built. The proposed temporary works consisted of hand-mining excavations (squareworks) with temporary timber and steel sections installed to support the ground and the operational LU tunnels.
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