BridgeEng17-Technology.pdf

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Microsoft PowerPoint - BridgeEng17-Technology

BRIDGES

Bridge Construction Technologies

Bridge Construction Technologies

Marek Salamak

Silesian University of Technology

Department of Roads and Bridges

17

17 Ï BRIDGES

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Department of Roads and Bridges

Today Agenda

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Steel superstructures

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Concrete superstructures

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Cast-in-place construction

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Modern technologies

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Incremental launching

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Cantilever methods

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Span by span

Marek Salamak 2/32

Incremental launching

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Department of Roads and Bridges

Steel Superstructures

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Long spans are fabricated in sections and assembled on site

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Site splices can be either bolted with high strength friction grip bolts or welded

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Splices are located near the points of contra flexure of continuous beams

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Lateral bracing are needed for erection stability and during concreting

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Fabrication of steel box and truss is carried out in a fabrication yard

Marek Salamak 3/32

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Department of Roads and Bridges

Concrete Superstructures

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Technology choice depends on

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Span and total length of the bridge

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Type of superstructures

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Bridge geometry in plan

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Local surroundings condition

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Range of technologies

Marek Salamak 4/32

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Range of technologies

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Department of Roads and Bridges

Cast--iin--Place Construction

Place Construction

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Classic method of erection suitable for short and low spans

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Falsework is used as

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Temporary framework to support the permanent structure during its construction

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It has to remain in place until the concrete becomes self-supporting

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Formwork is used to

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Retain plastic concrete in its desired shape until it has hardened

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It can be removed as soon as the concrete hardens

Marek Salamak 5/32

Cast

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