st james presentation short
TRANSCRIPT
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St James’s Market Service Tunnel
Damien Brennan Design Engineer Barhale plc
GE Basements and Underground Structures Conference
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Presentation overview
Developing a Temporary Works solution to construct and support a permanent service
tunnel between basements
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Presentation Content • Clients Brief
• Design Considerations
• Selection of Temporary Works Solution
• Design change
• Outline of design
• Design loading
• Technical Features
• Installation Sequence
• Construction Obstacles
• Installation Progression
• Construction Benefits
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Clients Brief
• Provide an underground service corridor between two eight-
storey retail and commercial blocks basements between 1 St
James’s Market (1 SJM) and 2 St James’s Market (2 SJM).
• Corridor to consist of underground reinforced concrete finish,
8m deep
• Temporary corridor/tunnel support system that is:
• Cost-effective,
• Fully designed,
• Adaptable solution that could be delivered and
• Installed safely
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Clients Brief
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Clients Brief
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Design Considerations
• Ground conditions: Stiff London CLAY
formation beneath 3m of soft slightly gravelly
CLAY
• Ground water was recorded below proposed
invert level of construction.
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Design Considerations • Site access and compound size
restrictions due to the on-going
redevelopment works for the
adjoining building on each side of
corridor.
• Ground level above tunnel profile to
be used as a storage area
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Design Considerations
• Design to be adaptable to change during
construction if any obstacle/unknown objects
or adverse ground conditions are encountered.
• Design to be constructible in terms of
components that can be man-handable,
delivery of installation sequence and access to
works areas
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Two options considered for Temporary Works Solution tunnel construction:
• Pipe Roof Method
• Timber Heading construction
Selection of Temporary Works Solution
Typical Pipe Roof Method Typical Timber Heading
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Pipe Roof Method • Generally shaft sunk on each end (from each basement)
• Microtunnel from centre top, proceeding in both direction if required
• Pipes to be braced/supported during excavation of soil
• Pipes fill with concrete
• Internal lined with concrete lining
• Lifting required for TBM and pipes
• Launch/reception frame required on each side for each Microtunnel launch
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Timber Heading Construction • Drive length up to 25m
• Timber side & head boards
• Steel or timber head & side Trees
• Head boards driven and cell hand excavated and support by each setting
• Each cell connected on all sides
• Working platform required on each side on each level
• Drive direction can be changed
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Heading Option Selected
Key Reasons
• Drive direction can change if unknown obstacles
are encountered
• Conditions can be monitored and design changed
during construction
• No plant required all hand dig
• All structural elements fabricated off-site
• All structural elements are man-handable
• No constraints in terms of tunnel dimensional
change
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Design Change
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Design Outline
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Design Outline
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Design Outline
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Design Outline
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Design Loading
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Technical Features • Corridor/Tunnel 8m deep to invert level
• Total drive length 7.5m
• Internal Tunnel opening at 6.7m wide x 3.2m high & 2.2m high
• Main steel Headtrees, Sidetrees and Cills 152x23UC
• Maximum spacing of primary supports (Headtrees) 1.45m
• Internal heading dimensions 1.4m x 1.45m
• Total number of heading set per row 8
• Circa 350 Tonnes of hand dig soil removed during construction
• Thickness of permanent reinforced concrete skin wall of tunnel lining
350mm thick
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Installation Sequence
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Installation Sequence
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Installation Sequence
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Construction Obstacles
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Construction Obstacles
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Installation Progression
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Installation Progression
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Installation Progression
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Installation Progression
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Installation Progression
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Installation Progression
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Installation Progression
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Installation Progression
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Installation Progression
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Installation Progression
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Installation Progression
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Installation Progression
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Installation Progression
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Installation Progression
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Installation Progression
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Installation Progression
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Installation Progression
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Installation Progression
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Construction Benefits
• Adaptable to change –drive direction change
• Conditions can be monitored and design changed
during construction
• No plant required all hand dig
• All structural elements fabricated off-site
• All structural elements are man-handable
• No constraints in terms of tunnel dimensional
change
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Questions?