BALANCE CANTILEVER BALANCE CANTILEVER BRIDGEBRIDGE --CONSTRUCTIONCONSTRUCTION

Dr. Amorn PimanmasSirindhorn International Institute of Technology, Thammasat UniversityNorconsult Civil Engineering

Balanced Cantilever Construction

-Construction method for several bridges across the Chao Praya River

-Good for medium to long span bridge, from 60-150 m.

-No scaffolding required in the river.

Rama V Bridge: Main span = 130 m, 2 side spans each 95 m.

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TromsoTromso Bridge, NorwayBridge, Norway80 m Span, Built in 195880 m Span, Built in 1958

RaftsundetRaftsundet Bridge, NorwayBridge, Norway298 m Span, Built in 1998298 m Span, Built in 1998

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NangklaoNangklao Bridge, ThailandBridge, Thailand84 m Span, Built in 198384 m Span, Built in 1983

PinklaoPinklao Bridge , Thailand Bridge , Thailand 114 m Span, Built in 1971114 m Span, Built in 1971

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Rama III Bridge , Thailand Rama III Bridge , Thailand 226 m Span, Built in 1996226 m Span, Built in 1996

Rama V Bridge , Thailand Rama V Bridge , Thailand 130 m Span, Built in 1999130 m Span, Built in 1999

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NewNew NonthaburiNonthaburi Bridge , Thailand Bridge , Thailand 160 m Span160 m Span

NewNew NangklaoNangklao Bridge , Thailand Bridge , Thailand 229 m Span229 m Span

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Existing Nangklao bridge

New Nangklao bridge

FREE CANTILEVER METHODFREE CANTILEVER METHODสภาวศิวกร

THE PRINCIPLE OF FREE CANTILEVERINGTHE PRINCIPLE OF FREE CANTILEVERING

PROCEDURE OF BALANCED CANTILEVERINGPROCEDURE OF BALANCED CANTILEVERING

1) ASSEMBLY OF FIRST TRAVELLER

2) FIRST TRAVELLER READY FOR CONCRETINGASSEMBLY OF SECOND TRAVELLERS

3) SECOND TRAVELLER READY FOR CONCRETING

4) STRESSING OF CABLES5) ADVANCING OF TRAVELLERS CONCRETING OF THIRD SEGMENT

FIRST TRAVELLERS READY FOR CONCRETING OF FOURTH SEGMENT1

2

3

4

5

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TYPICAL CABLE LAYOUT

TWIN WALL TYPE PIER

CROSS CROSS -- SECTIONSECTION

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BOXBOX--GIRDERGIRDER

Jetty Jetty

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Platform Platform PrecastPrecast Element Element

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PierheadPierhead

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PierheadPierhead

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11

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Segment Segment

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Segment Segment

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Concrete BarrierConcrete Barrier

Aphetic Topping Aphetic Topping

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CANTILEVERING ON ONE PIERCANTILEVERING ON ONE PIER

VIEW VIEW OF BRIDGE DURING OF BRIDGE DURING CANTILEVERINGCANTILEVERING

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MID SPAN CLOUSUREMID SPAN CLOUSURE

CONNECTED AT MIDSPANCONNECTED AT MIDSPAN

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