Launching Bridges in to the Future CBDG Annual · PDF fileEvolution - Incremental Launching...
Transcript of Launching Bridges in to the Future CBDG Annual · PDF fileEvolution - Incremental Launching...
![Page 1: Launching Bridges in to the Future CBDG Annual · PDF fileEvolution - Incremental Launching • Sungai Sitiawan Bridge – 650m long bridge over Sungai Sitiawan – classic 45m spans,](https://reader031.fdocuments.in/reader031/viewer/2022020113/5aaab7be7f8b9a81188e5b0b/html5/thumbnails/1.jpg)
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Launching Bridges in tothe Future
CBDG Annual Conference26 June 2008
Simon BourneManaging Director
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Use of Incremental Launching
• Deck lengths of more than 200m
• 30-70m spans, typically regular 45m spans
• Constant depth at L/h~16
• Single-cell boxes best
• Steel moulds to cast ~25m per week
• Steel launching nose
• Pushed or pulled over low-friction surfaces
• Straight cables or RC for launching
• Profiled cables for continuity
• See CBDG Current Practice Sheet No. 13 for more details
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Evolution - Incremental Launching
• Sungai Sitiawan Bridge
– 650m long bridge over Sungai Sitiawan
– classic 45m spans, internal prestress
• Broadmeadow Estuary Bridge
– 310m long bridge over estuary and bird sanctuary
– 69m spans, props, RC and external prestress
• Blackwater Viaduct
– 450m long bridge over River Blackwater
– 58m spans, props, RC and external prestress
• Kincardine Bridge
– 1,190m long bridge over Firth of Forth
– 45m spans, external prestress
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Classic Launching - Sungai Sitiawan
• 45m spans
• Constant 2.9m depth
• No temporary props
• 30m long steel nose
• Straight, internal cables for launching
• Profiled, internal cables for continuity
• Fully prestressed and fully compressed
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Sungai Sitiawan BridgeLaunching nose
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Internal launching prestress
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Sungai Tebok Raja
Samalon Bridge
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First Evolution of Launching - Broadmeadow
• 69m spans
• Constant 2.9m depth
• Temporary midspan props
• 25m long steel nose
• RC section only for launching - design to crack widths
• Profiled, external cables for continuity - 310m long
• Partially prestressed in service
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Broadmeadow Estuary BridgeTemporary props and nose
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External continuity cables
and deviators
at third points
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External continuity cables
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Broadmeadow Estuary Bridge
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Broadmeadow Estuary Bridge
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Second Evolution of Launching - Blackwater
• 58m spans
• Constant 2.9m depth
• Temporary midspan props
• 20m long steel nose
• RC section only for launching - design to crack widths
• Profiled, external cables for continuity
• 450m long, low-friction VBT cables
• Cables anchored only at the abutments
• Partially prestressed in service
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Blackwater ViaductBlackwater ViaductTemporary props and nose
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Temporary props and nose
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External continuitycables
and deviatorsat third points
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External continuitycables
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Blackwater Viaduct
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Third Evolution of Launching - Kincardine
• 45m spans typically
• Constant 2.8m depth over 1,190m
• No temporary props on marine 45m spans
• 35m long steel nose
• Straight, external cables for launching - 2 spans long
• Profiled, external cables for continuity - 3 spans long
• Partially prestressed and designed to 0.15-0.25mm crack widths
• Fully compressed under permanent loads
• Loads shared between prestress and rebar
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Kincardine BridgeLaunching nose and single marine piers
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Launching nose attachment
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125m long casting area
with two skidding beams
on vertical CFA piles
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1,200t pushing jacks
32,500t deck
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Pier top and
soffit integration
to suit launching
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GRAVEL
L A U N C H I N G
PILE / PIER MOMENTS
LAUNCH
2520151050
1.2MN
MLWL
MHWL
SOFT CLAY
GLACIALGRAVELLY CLAY
SANDSTONE
MUDSTONE
SANDSTONE
Single 3m diameter
bored piles
in rock sockets
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Permanent steel casings
1% rebar in pile cage
sized under
launching
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225mm slabs and 400mm webs
with Grade 60 concrete
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3.5m long diaphragm unit with launching and continuity cables
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C O N T I N U I T Y C A B L E
Continuity cables
and deviators
at third points
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Kincardine Bridge
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Fourth Evolution of Launching - Modular Bridges
• 15-50m spans
• Constant depths of 1-3m
• 2.5m long precast shells match-cast off site
• Assembled and infilled with concrete on site
• Straight, internal cables for launching
• Temporary props possible
• Steel nose
• Profiled, internal cables for continuity
• Fully prestressed
![Page 33: Launching Bridges in to the Future CBDG Annual · PDF fileEvolution - Incremental Launching • Sungai Sitiawan Bridge – 650m long bridge over Sungai Sitiawan – classic 45m spans,](https://reader031.fdocuments.in/reader031/viewer/2022020113/5aaab7be7f8b9a81188e5b0b/html5/thumbnails/33.jpg)
Objectives
• Serious competitor to steel-composite and precast beam schemes
• More elegant and efficient than steel-composite or precast beams
• Covers all standard highway locations
• Covers variable depths, spans and widths
• Launching technology to avoid working at height over the road
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Evolution - Precast Shells
• Taney Road Bridge
– 110m main span cable-stayed bridge
– Alternative precast shell solution
– Quicker erection over road junction
– Easier stressing operations
• River Shannon Bridge
– 150m long 5-span bridge
– Alternative precast shell solution
– Quicker and easier construction
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Taney Road BridgePrecast shells
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Taney Road Bridge
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River Shannon BridgePrecast shells
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River Shannon Bridge
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Key Features
• Speed of construction is the key to value
• Match-cast off site for safety, quality and speed
• Elimination of box forms – easier moulds
• Shell structure to provide the soffit form
• Internal prestressing in infill with continuous ducts to TR47
• Pre-assembly behind abutment for safety and quality
• Launched in to place for safety, ease and less traffic disruption
• Props may be used to reduce prestress
• Robust, simple, clean lines for low maintenance
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CL
PRECAST EDGE UNIT
BARS - 2No 32 DIA.
TEMPORARYPRESTRESSING
PRECAST CONCRETE SHELL
INSITU INFILL CONCRETE
2 No 19/15mmLAUNCH CABLES
6 No 19/15mmPROFILE CABLES
Typical Midspan Section
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Typical Construction Sequence
TEMPORARY STRESSFORM JOINTSPACK UNITS AND ALIGNLAUNCH OVER PROPS
ATTACH NOSESTRESS LAUNCH CABLESPOUR INFILL CONCRETE
TEMPORARY STRESSFORM JOINTSPACK UNITS AND ALIGN
3
2
1
TEMPORARY PIERS& FOUNDATIONS & FOUNDATIONS
TEMPORARY PIERS
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Typical Construction Sequence
REMOVE PROPSSTRESS PROFILED CABLESCAST MONOLITHIC PIER TOPSREMOVE NOSE
COMPLETE LAUNCH
STRESS LAUNCH CABLESCOUPLE LAUNCH CABLESPOUR INFILL CONCRETE
6
5
4& FOUNDATIONSTEMPORARY PIERS TEMPORARY PIERS
& FOUNDATIONS
& FOUNDATIONSTEMPORARY PIERSTEMPORARY PIERS
& FOUNDATIONS
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Typical Three-Span Bridge
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Options for Varying Spans
-150
015
00 -
2000
INFILLIN-SITU
UNITSPRECAST
LC
MAXIMUM SECTION: SPANS 35-50m
MINIMUM SECTION: SPANS 15-25m
TYPICAL SECTION: SPANS 25-35m
LC
IN-SITUSTITCH
SPAN CABLESPROFILED
PIER CABLESPROFILED
CABLESLAUNCH
2000
- 27
5010
00
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Options for Varying Widths
600020006000
400010004000
500015005000
TYPICAL DECK WIDTH: 11.5m
NARROW DECK: 9m
WIDE DECK: 14m
CL
LC
LC
NO
. OF
BE
AM
S
OVERALL DECK WIDTH (m)
3824
19 30
2214
9 14
64
40302010
5
4
3
2
1
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Typical precast shell unit
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Typical three-span bridge
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Typical soffit
appearance
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Typical soffit
appearance
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Launching Bridges in to the Future
• High-quality concrete
• Factory-controlled conditions
• Safer and faster construction
• Minimises traffic disruption
• Integration of design and construction is key
• Low maintenance structures
• New innovations always developing
• See CBDG Current Practice Sheet 13 for more details
• See CBDG Technical Guide 12, “Guide to Modular Bridge Construction” - due out soon
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Launching Bridges in to the Future