Lee Tunnel: Project update - Health & Safety Hubdocs.healthandsafetyhub.co.uk/MVB/Presentations/mvb... · 2012-09-26 · Lee Tunnel: Project update 10 January 2011. 2 The Lee Tunnel
Post on 28-Jul-2018
216 Views
Preview:
Transcript
2
The Lee Tunnel
� Four mile (6.9km) tunnel from Abbey Mills to Beckton STW
� Storage and transfer tunnel
� Entire storage space of 382,000m3 provided by both the tunnel and shafts
� Up to 75m underground with an internal diameter of 7.2m
Benefits
� Deals with single worst polluting CSO in London
� Abbey Mills CSO is responsible 40% of the total volume of untreated sewage currently entering the tidal River Thames
� Will intercept 16 million tonnes of untreated sewage currently discharged into the River Thames each year on average, via the River Lee
� Starts and ends on land we already own; requires no intermediate construction sites
Building the Lee Tunnel
� £635 million project – largest contract we have ever awarded
� Joint venture comprising Morgan Sindall, Vinci Construction Grands Projets and Bachy Soletanche (MVB)
� 500 staff (including labour) at peak construction
2010 achievements
� Jan – Site establishment works
� June - Mobilisation on site
� Sept - Start of work on overflow
shaft
� Oct - Spoil handling via the river
� Nov – Start of work on pump
shaft
� Dec – D-wall preparations for
pump shaft
Overflow shaft20m diameter; 74.5m deep
� Work on shaft started Sep 2010
� Due for completion in late Jan/early Feb 2011
Pump shaft38m diameter; 86.5m deep
� Largest and deepest
shaft for the project
� Preparatory works
nearing completion
� Diaphragm walling to
start Jan 2010
Batching plant
� On site concrete batcher
� Will produce the bulk of
concrete for shafts and
tunnel
� Total concrete to be used
on the project = 143,000 m3
Abbey Mills25m diameter; 68m deep
� Survey works and site establishment underway
� Start on site in Jan 2011
� Construction of the Abbey Mills shaft due to start in summer 2011
Future key milestones
2011 • Shaft excavation and construction
• TBM arrival
• TBM assembly
S • TBM drive starts
2013 • TBM breakthrough
• MEICA fit out starts
2014 • Tunnel construction completed
top related