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Fisher Street, Crossrail C300/410

United Kingdom

Construction of concrete tunnel lining of crossover structure linking the eastbound and westbound main train tunnels.

Tunnel to be formed in 10 pours, formwork to be easily moved and adjusted to each new pour location. Tunnel width varies to suit headwalls at location of tunnel mergers. Access required through formwork support for operatives and small plant. Pour lengths vary to suit head walls at tunnel mergers. Longitudinal inclination of tunnel, curvature of tunnel. Concrete to be placed by pump in confined working spaces. Lateral loads on support system due to cross passages, etc.
SL1 H.D. Support system with Top50 Formwork. Travelling formwork moved between pours via flanged wheels on rails with the aid of tirfors/plant. System lowered with lowering wedges and levelled for next pouring cycle using hydraulic hand pumps. Support frame provides good access by using knee braces to create central opening. Working platforms provide access for operatives to adjust the formwork with spindles and for placing and vibrating concrete with use of SCC pumping ports and external vibrators attached to the Top50 formwork.

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Project data

Year of completion
2015
Project duration
4 Months
Country
United Kingdom
Town or city
London
Realization
Bam Ferrovial Kier JV
Structure
Tunnel
Type of structure
Mining-type tunnel

Segmented construction method

Cross-sectional shape
Curved/round
Clear width
6,32 m
Clear height
6,14 m
Formed length of tunnel
62 m
Length of concreting section
7,32 m
Number of casting sections
10