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Innovation Technology of Bridge in Korea
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Ⅰ. Overview of bridge in Korea
Ⅱ. Upgrade semi integral abutment bridge
Ⅲ. Implementation of material technology
Eui Joon Lee
KOREA
Ⅲ. Implementation of material technology
Ⅳ. IT-based maintenance technology
V. Conclusion
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Eui Joon Lee
KOREA
※ 31 Cable Bridges- Cable stayed, Suspension bridge
≒ HS20
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Eui Joon Lee
KOREA
(Super-Long SpanR&D Project)
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Conceptual Picture
Control disp. Control disp.
End Diaphragm
The length change of superstructure
due to temperature change is separated.
Expansion joint is eliminated.
Cyclic control joint is installed.
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Upgrade Background
Poor constructing condition
Complexity of bar placement with parapet wall and end slab
Bad workability of end slab (form, bar placement, concreting)
Overturning risk of placed girder
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New Integrated PSC-I Girder
Unification with end wall and girder
Elimination of overturning risk of girderElimination of overturning risk of girder
Rapid and Optimizing workability of construction
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Procedure
Setting steel form with girder and end wall Cure concrete
Post-tension and concrete end diaphragm Partially in-site concrete of end wall
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Expected effect
Save cost up to15% in comparison with joint bridge
Workability & Safety improvement
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- World’s best level high-performance steel wire, strand and cable systems
- Performance certification systems for cables and high strength steel
Development of high performance cable systems and steel
Wire : 1860MPa (φ5.4) 2100MPa (φ5.4)
Steel : SM490,SM520 HSB500, HSB600
Wire : 1770MPa (φ7) 1900MPa (φ7)
Steel : SM520,SM570 HSB600, HSB800
- Performance certification systems for cables and high strength steel
Long span bridge application of high performance cable and steel
Save costup to15%
Save costup to10%
→ The reduction of self-weight in the bridges
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Targetproducts
ElementsTechnology level (Tensile strength)
RemarksPresent Target
Steel wire High strength steel wire( φ5.4mm), (Year 2012)
• 1,960MPa • 2,100MPa World Best
High strength steel wire( φ7mm), (Year 2013)
• 1,770MPa • 1,900MPa World Best
Steel strand High strength steel strandfor MS cable & System 1,860MPa 2,200MPa World Best
Target products of high-strength steel wire, strand and PPWS
for MS cable & System( φ15.7mm), (Year 2012)
• 1,860MPa • 2,200MPa World Best
High strength steel strandand Systems PT( φ15.2mm),
(Year 2011)• 2,230MPa • 2,400MPa World Best
PPWS
2100MPa PPWS CableSystem, (Year 2013)
•2,060MPa • 2,100MPa World Best
NOTE) MS: Multi Strand, PT: Post Tensioning, PPWS: Prefabricated Parallel Wire Strand
- Completion of performance certification test
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Target ProductsTechnology level
remarksPresent Target
High Strength and HighToughness Steel (HSB®800L)
and Welding Consumable
(Year 2012)
<BHS700 - Japan>
•Toughness- BM: over 100J @ -40℃
<HSB®800L>
•Toughness: over 47J @ -40℃
WorldBest
High Strength Weathering Steel(HSB®800W) and WeldingConsumable (Year 2012)
<HPS690W - USA>
•Toughness: over 48J @ -34℃
•Weathering Steel
<HSB®800W>
•Toughness: over 47J @ -20℃
•Weathering Steel
WorldBest
Target products level of high-performance steel
Leak tightness of cable system
15 MN CLTM
Cable Leak Testing Machine : CLTM
30 MN CFTM
Cable Fatigue Testing Machine : CFTM
Fatigue and static strength of cable system
Performance certification system for the cables (test standard & machines)
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The final goal of
Maintenance of long span cable bridges
- Rapid increase in number of cable bridges in Korea
> In-service: 31, Under-construction: 41, 5~6 bridges until 2015
- Main characteristics of maintenance in long span cable bridge
> large investment structures, the cost of a structural accident or failure are enormous
- Preventive maintenance is required for the long term safe & economic operation of bridges
The final goal of
long span cable bridge
maintenance
is integrated operation system
NOTE) USN: Ubiquitous Sensor Network,
GNSS: Global Navigational Satellite System, BMS: Bridge Maintenance System
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Global Navigational Satellite System(GNSS) based bridge monitoring system
GNNS monitoring system is more stable substitution with existing gauges
GNSS : GPS in USA, Galileo project in Euro
(displacement measuring equipments and accelerometer)
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Vision-based monitoring systemProcessing
Field Testing and Results in
Gwangan bridge in KOREA
→ Accurately predict the tension of the cable → Ensure the safety of the cable bridges
The acquisition of the dynamic property of cables in the bridge.
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Inspection Robot System
1. Vision-based surface damage detection of cable exterior
2. Non-destructive Test for internal damage detection
Smart inspection system of IT-based disaster mitigation & Target members are stay cables and hangers
Verification of
damage detection
using sensor
loss of cross-sectional area section cutting
※ Developed Robot System can be used reasonably
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1. Semi-integral abutment bridge
- save cost up to 15% in comparison with joint bridge
- workability and safety improvement
2. High performance materials
- save cost about 10 to 15%
- cable-stayed bridge and suspension bridge- cable-stayed bridge and suspension bridge
3. Proposed maintenance tools of long span cable bridges
- more reasonable and safer than existing method
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Thank youThank you