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2017 Transportation Short Course – Accelerated Bridge Construction October 11, 2017

ACCELERATED BRIDGE CONSTRUCTIONGraham Bettis, P.E.

TxDOT Bridge Division

2017 Transportation Short Course – Accelerated Bridge Construction October 11, 2017

Accelerated Bridge Construction

What we’ve done.

What we’re doing.

What we plan to do.

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2017 Transportation Short Course – Accelerated Bridge Construction October 11, 2017

What We’ve Done

Lateral Slide-In – LP 345 in San Antonio

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Prefabricated Elements

Decked

Slab

Beams

2017 Transportation Short Course – Accelerated Bridge Construction October 11, 2017

Full-Width, Full-Depth Deck Panels

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2017 Transportation Short Course – Accelerated Bridge Construction October 11, 2017

Full Width, Full Depth Panels – FM 413 @ Brazos River

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Bid July 2017 for

$3.5M

ABC Duration:

31 working days

Traditional

Approach:

96 working days

2017 Transportation Short Course – Accelerated Bridge Construction October 11, 2017

Modular Units - Expanding West Dallas St. Concept

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2017 Transportation Short Course – Accelerated Bridge Construction October 11, 2017

Dallas Rapid Replacement

IH 20 EB & WB at Houston School Rd and IH 635 NB & SB at Seagoville Rd

Accelerated Construction Estimate: $7.9M.

– One weekend closure per bridge plus phased approach slab work and

deck grinding.

Traditional Construction Estimate: $11.8M.

– Four months per bridge.

That’s not the norm on cost. Typically ABC will cost significantly more in

terms of dollars but far less for user costs and impacts.

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2017 Transportation Short Course – Accelerated Bridge Construction October 11, 2017

Dallas Rapid Replacement

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2017 Transportation Short Course – Accelerated Bridge Construction October 11, 2017

Modular Units

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2017 Transportation Short Course – Accelerated Bridge Construction October 11, 2017

Modular Units – I-93 Fast 14 in Boston

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2017 Transportation Short Course – Accelerated Bridge Construction October 11, 2017

Decked Tx Girders – Conceptual Only

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2017 Transportation Short Course – Accelerated Bridge Construction October 11, 2017

Two-Girder + Permanent Concrete Deck Form – Conceptual Only

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2017 Transportation Short Course – Accelerated Bridge Construction October 11, 2017

Self Propelled Modular Transporters (SPMT)

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Photos Courtesy of Heavy Equipment Guide

2017 Transportation Short Course – Accelerated Bridge Construction October 11, 2017

SPMT – Fort Worth West 7th Street Arches

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2017 Transportation Short Course – Accelerated Bridge Construction October 11, 2017

Lateral Slide-in

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2017 Transportation Short Course – Accelerated Bridge Construction October 11, 2017

Accelerated Bridge Construction Considerations

Engage prime contractors and fabricators early and often.

Remain open to alternate concepts.

Ensure that concept is feasible, but do not design in any more methodology

than needed.

Just because a concept has worked well in other areas of the country does

not necessarily mean we can jump right in.

– Lightweight concrete.

– Ultra-high performance concrete.

– Fabrication: plant vs. jobsite, combining steel and concrete elements.

Consider user costs and impact when weighing accelerated vs. traditional

construction methods.

Extended phased construction and traffic control can equal significant cost.

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2017 Transportation Short Course – Accelerated Bridge Construction October 11, 2017

QUESTIONS?Paul Eley – TxDOT Houston District, paul.eley@txdot.gov, (281) 319-6403

Graham Bettis – TxDOT Bridge Division, graham.bettis@txdot.gov, (512) 416-2526

2017 Transportation Short Course – Accelerated Bridge Construction October 11, 2017

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