Transcript Metro Stations- Arch Configurations

A New Approach to Constructing
Underground Stations
JAMES THOMSON C. ENG
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Jacked Installations for Large Structures
Some Early Projects
 Modular installation of
foundations, abutments and piers
 Box Jacking
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Modular Concept
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Wandsworth- 1969
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The Box Jacking Concept
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Brent Cross -1974
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New Concepts
THE JACKED ARCH
THE JACKED DECK
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The Jacked Arch Concept
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The Jacked Deck Concept
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Cliffsend Underpass
A 20M WIDE 126M LONG ROAD
UNDERPASS BELOW RAIL TRACKS
CLIENT: EAST KENT CC
CONTRACTOR: VOLKER
FITZPATRICK HOCHTIEF JV
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Cliffsend Underpass
Tender Scheme
a
Volker Fitzpatrick
Hochtief JV
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Cliffsend Underpass
Final Scheme
Volker Fitzpatrick Hochtief J
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Cliffsend Road Underpass –Aerial View
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Cliffsend Road Underpass
Jacked Deck Face Excvation
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Cliffsend Road Underpass
Deck Jacking Installation
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Underground Metro
Stations
INSTALLATION BY
JACKED ARCH AND
JACKED DECK
METHODS
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Metro StationsArch Configurations
Top Box with Piles
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Modular foundations and
Walls
Metro Stations
Arch Configurations
Foundation Box
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Foundation Tunnel
Four Platform Arrangement
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Alternative Four Platform Arrangement
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Jacked Deck Concepts
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An underground station – piled abutments
from a high level box and a jacked arch
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Application of Jacked Deck to
Launch Boxes
TYPICALLY:
22M -24 M SPAN
AROUND 200M LONG
DEPTH VARYING FROM 6M-10M
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Advantages of the Jacked Arch and
Deck Approach
• By breaking down the process into
e l e m e n t s r e d u c e s t h e e xp o s e d s o i l f a c e
• Minimises jacking forces and reaction
arrangements.
• C o n t i n u o u s s u p p o r t o f t h e e xc a v a t i o n w i t h
a full structural lining
• Surface settlement is minimal
• Use of precast units allows higher quality
construction
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Advantages of the Jacked Arch and
Deck Approach
• A wide range of geometry and configurations
• Installation to very close line and level
tolerances
• Methods are applicable to both shallow
and deep structures
• Provides greater clear spans over much
longer drive lengths.
• Small launch platform area
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