Bank Underground Station Capacity Upgrade (BSCU)

London Underground / Dragados delivering a major capital project to expand Bank underground station.

 

This £642m scheme has been introduced to reduce journey times and congestion on the Northern Line, Central Line, Docklands Light Railway (DLR) as well as interchange areas within the Bank-Monument station complex.

 

Cleshar’s role within the project included providing specialist multidisciplinary support, in addition to delivering several key project packages.

 
Scope of works
  • Early Contractor Involvement and multidiscipline technical design team support

  • Civils & Premises construction survey team support

  • Fire rated station and track hoarding installations

  • Coring packages to allow Ventilation ducts, HV cabling and high-pressure pipe work to pass through the station

  • Pipe subway/enabling works for Dragados’ tunnel teams

  • Construction of a new locker room and welfare areas for 80no staff

  • Demolition of existing welfare areas and construction HV and LV rooms

  • Concrete encapsulation of structural columns

  • Lead paint removal to structural steels and walls

  • Structural slab removal and re strengthening works

  • Creating new steel structures (Shaft staircases & complex structural supports to form new operational rooms directly above escalator within a void area)

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Client

London Underground

Location

Bank Station

Project Value

£5.7M

 

Contract Start and Completion

June 2014 - November 2017

 
Innovation

Early Contractor Involvement

At precontract stage, TFL funded bidders and their supply chain for tender/technical support with the objective to offer early value and de risk construction stage. This was planned via ICE implementation which was designed to incentivise early innovation from the supply Chain. The innovative technical expertise from suppliers to Dragados then lead to being awarded the contract. The BSCU team won a Construction Excellence Award for Integration and Collaborative Working.

As part of the ECI stage, Cleshar were involved in carrying out extensive, intrusive survey work, checking structures, foundations, and ground conditions to de-risk the construction phase. Cleshar contributed to the design development of the station civils and premises packages and new Northern Line southbound slab track installation. Early Contractor Involvement knowledge led to more definitive pricing of the works with clear risk identification and allocation.

Other elements included buildability, noise, and vibration (as the main works are taking place underneath a conservation area, including many major, historic, and listed buildings), logistics, possessions, and programme.

Engineering interfaces:

Undertaking 24/7 highly complex works within one of London Underground’s busiest stations presented its challenges at Bank.

 

It was key to ensure no impact of the works on day-to-day station operations and the travelling public, as well as protection of existing assets.

 

This was managed through meticulous planning and close collaboration with Dragados, London Underground’s Station Operations Manager and Dragados’ Interface Manager. Unique complex Temporary Works installations required above live operational escalators, confined space within lift shafts, basement areas with live mains gas lines, were among some of challenges the delivery team had to overcome.

 

This was achieved by “outside of the box” engineering thinking along with meticulously planned delivery.

 

Collaborative working

Parties from London Underground, Dragados, Cleshar, T Clarke and design teams were all collocated on desks together to maintain constant communication.

 

Operational, Commercial, HSQE, and Engineering all co located with their counterparts from each organisation.

 

This led to improved communications and rapid responses to manage planning and change control of the 24/7 working site teams.

 
Benefits / Project Outcome

Cleshar successfully delivered highly complex packages of critical path works which enabled the next main tunnelling works phase to commence.

 

Cleshar are proud to have undertaken a key role in one of London Underground largest capital projects in a generation.