hays street bridge rehabilitation patrick sparks, p.e. approaches to historic bridge rehabilitation...
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Hays Street Bridge Rehabilitation
Patrick Sparks, P.E.
Approaches to Historic Bridge Rehabilitation
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Hays Street Bridge Rehabilitation San Antonio, Texas - viaduct over railroad, connecting historic
neighborhood to downtown Length: 1400-LF (1000-LF approach + 355-LF trusses) Date and Truss Spans:
1881 Whipple w/ Phoenix patent – 225-ft 1881 Pratt through - 130-ft
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San Antonio River
East side historic neighborhood
Downtown
Hays Street Bridge
Union Union Pacific RRPacific RR
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Hays Street Bridge Rehabilitation Completed: 2010 Construction Cost: $3.2 M Design Team:
Sparks Engineering, Inc. - Prime
Bender Wells Clark – Landscape Architects
Garcia & Wright – Civil Joshua Engineering -
Electrical Client/Owner: City of San
Antonio Contractor: Jay-Reese
Contractors
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Significant Issues Associated With Project Deteriorated and obstructive concrete
approaches Iron truss evaluation using nondestructive
methods Corrosion of floor beams, U-bolts, stiffeners, pins,
lateral struts built-up columns.
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Deteriorated and Obstructive Concrete Approaches
Obstruction High level of
deterioration Major cost item Street clearances Accessibility compliance Historic significance? 30-ft width
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How the Deterioration & Obstruction Issue was Resolved
New Concrete Approaches: Cast-in-place concrete
Reduced width to 15-ft Single piers, 40-ft spacing Concrete through girder
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Evaluation and Rehabilitation of Iron Trusses 1881 Pratt and Whipple
designs Phoenix wrought iron columns Cast-iron joint blocks Wrought iron eyebars Early laminated steel pins “Pneumatic Impact” method
by Vern Mesler
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Floor beams, u-bolts, stiffeners, pins, lateral struts, built-up columns
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Lessons Learned/ConclusionsSensitive and appropriate reconstruction of
1910 approaches saved money, made the project feasible, and improved the outcome for all stakeholders
Nondestructive evaluation was essential for unique 1881 cast-iron/wrought iron trusses.
Appropriate repair and preservation techniques were targeted, cost effective, not overly conservative, and durable.
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