innovating in a compact environment
DESCRIPTION
Innovating in a compact environment. EAST KENT ACCESS PHASE 2 CLIFFSEND UNDERPASS JACKED DECK TUNNEL. JACKED STRUCTURES. ESTABLISHED METHODS. JACKED DECK CONCEPT. JACKED DECK BENEFITS. ALTERNATIVE ABUTMENTS. Jacked Access Box and piled abutments . Jacked foundation and wall boxes. - PowerPoint PPT PresentationTRANSCRIPT
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INNOVATING IN A COMPACT ENVIRONMENT
EAST KENT ACCESS PHASE 2CLIFFSEND UNDERPASSJACKED DECK TUNNEL
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JACKED STRUCTURES
The concept of horizontal construction to install underground structures developed in mid-late 20th century.
The work is characterized by off-line construction of the permanent structure elements with a relatively short period of installation and minimal disruption to surface facilities.
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ESTABLISHED METHODS
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JACKED DECK CONCEPT
A patented approach which builds on proven horizontal jacked installation techniques
Based on the installation of a slide path within access tunnels or boxes.
Deck units are jacked in along the slide path as excavation takes place in a compartmentalized shield fixed to the leading unit.
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JACKED DECK BENEFITS
Continuous face support
with full structural
lining
Minimizes exposed soil
face
Install greater spans and
longer drive lengths
Close installation
accuracy
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ALTERNATIVE ABUTMENTSJacked Access Box and piled abutments
Jacked foundation and wall boxes
Tunnel and piled abutments
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EAST KENT ACCESS PHASE 2
Client: Kent County Council
Engineer: Jacobs
Scheme prequalification
in 2008 Bids submitted in March 2009
Original scheme concept for Cliffsend:
Twin Jacked Boxes
Contract Award: VolkerFitzpatrick
HOCHTIEF JV
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EAST KENT ACCESS PHASE 2
The East Kent Access road involves:• 8km dual 2 -lane carriageway with 3 roundabouts • An area of outstanding archaeological significance
Design and Construct Structures• 2 span dual carriageway road bridge over railway • A 100m+ underpass under rail tracks and level crossing at Cliffsend
Client’s Perspective• Its not a road scheme• It's a railway crossing scheme with archaeology
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SCHEME LAYOUT
A256
A299
CLIFFSEND
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CLIFFSEND UNDERPASS
Picture courtesy of VolkerFitzpatrick HOCHTIEF JV
Looking West
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KCC/JACOBS TENDER SCHEME
Suggested installation concept based on box jacking
Two parallel boxes 10m wide x 7.2 m high
Total box length 2 x 103 metres, each in three sections
Cover below rail tracks 6m
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VolkerFitzpatrick HOCHTIEF JVDesign and Construct Submission
Following Value
Engineering
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VolkerFitzpatrick HOCHTIEF JVCLIFFSEND TEAM
Permanent Works Designer Atkins
Third Party Checker Tony
Gee & Partners
Precast Concrete Sian Formwork (Deck)
F P McCann (Segments)
Deck Jacking Mammoet
PilingKeller
TunnellingPilots - Murphy
Deck - McBurney
Jacked Installation Consultant Jacked
StructuresMain ContractorVolkerFitzpatrick
HOCHTIEF JV
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GEOLOGY
•Overlying Thanet Sands (1-2m thick)Drift - Head Brickearth
•Overlying Chalk (1-2m thick)Drift - Chalk Head
•Thickness increasing towards the south,Solid - Thanet
Sand
•Underlying entire siteSolid- White Chalk
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PILOT TUNNELS
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DECK / SHIELD
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SLIDE TRACK
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ANTI DRAG SYSTEM
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JACKING
0102030405060708090100
110
120
130
-
2,500
5,000
7,500
10,000
12,500
15,000 Accumulated Jacking Load Applied
Station (metres)
Tonn
es
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EXCAVATION
Average progress 2m / day
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NETWORK RAIL INTERFACE
Continuous automatic monitoringTrack fettling during non revenue hours
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GOING FORWARD
Integrated structural solutions facilitate greater structural lengths and spans
A cost effective approach
Continuous structural ground support reduces risk
Applicable to Underpasses, Metro Stations and Launch Boxes
Early engagement is vital to realise full benefits