Innovation Technology of Bridge in Korea

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

Eui Joon Lee

KOREA

※ 31 Cable Bridges- Cable stayed, Suspension bridge

≒ HS20

Eui Joon Lee

KOREA

(Super-Long SpanR&D Project)

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.

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

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

Procedure

Setting steel form with girder and end wall Cure concrete

Post-tension and concrete end diaphragm Partially in-site concrete of end wall

Expected effect

Save cost up to15% in comparison with joint bridge

Workability & Safety improvement

- 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

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

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)

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

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)

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.

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

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

Thank youThank you