Crossrail has completed construction of an emergency access shaft in Holborn almost nine months ahead of schedule.
Crossrail’s western tunnels contractor BAM, Ferrovial, Kier (BFK) and their subcontractor Barhale, has been excavating and lining a 15m diameter emergency access shaft in Holborn; known as the Fisher Street shaft.
The shaft will be used to support tunnelling works to build a large crossover tunnel below Red Lion Square at Holborn, which will allow trains to transfer from one running tunnel to another.
It was completed nine months ahead of the August 2014 scheduled end date due to re-sequencing the works that allowed for the early completion of permanent waterproofing and concrete lining of the shaft.
In total 7,000m3 of material was excavated as the shaft was dug and lined.
Crossrail worked with UK Power Networks to relocate electricity substation equipment, a requirement before tunnel boring machines Phyllis and Ada could pass under Holborn on their journey between Royal Oak and Farringdon. The partnership saw UK Power Networks perform a difficult project in a tight and congested corner of London as they relocated their switchgear equipment.
Roger Mears, Crossrail Construction Manager, said: “These works are key to Crossrail’s success in the Holborn area, and the completion of the excavation and structural lining of the Fisher Street shaft is another milestone in our western tunnels project.”
Doug Neilson, Project Manager, UK Power Networks, said: “We understand the importance of the work being undertaken by Crossrail and are pleased that our teams were able to complete this work on time.”
Last month Camden Council approved Crossrail plans to develop 30,000 square feet of residential space above the shaft after the completion of Crossrail’s works. The HOK-designed, eight-storey development comprises 22 one, two and three bedroom apartments. The shaft itself will remain in place providing emergency access and ventilation to the Crossrail tunnels.
Notes to editors:
Fisher St Shaft
The Fisher Street shaft in Holborn is 15m in diameter. It will be used for emergency egress and access to the tunnels. Next year, BFK will construct a crossover tunnel, accessed from the Fisher St shaft, which is a significant piece of tunnelling works and will require construction of some of the largest underground caverns on the Crossrail project.
The Crossrail route will pass through 38 stations and run over 100km from Maidenhead and Heathrow in the west, through new twin-bore 21 km (13 miles) tunnels below central London to Shenfield and Abbey Wood in the east.
When Crossrail opens it will increase London's rail-based transport network capacity by 10%, supporting regeneration and cutting journey times across the city. Crossrail services are due to commence through central London in 2018.
Crossrail is being delivered by Crossrail Limited (CRL). CRL is a wholly owned subsidiary of Transport for London. Crossrail is jointly sponsored by the Department for Transport and Transport for London.