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Published byNoel nolan Greg Modified over 10 years ago
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RAILROAD BRIDGE AND TRACK DESIGN AND COORDINATION ISSUES Lloyd M. Wolf, P.E.
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Coordination with Railroad Meet with Railroad Early in Project Development to Discuss Railroad Track Operations are Very Important Minimize Impact on RR Operations LOA and RR Agreement
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Structure Type Selection and Bridge Design
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Superstructure Considerations Safety –Highway Users –Railroad Required Span for Horizontal Clearance –Column Protection Adequate Vertical Clearance
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Preferred Railroad Grade Separations 1. Overpass 2. UPRR Steel Deck Girder Standards 3. Deck Plate Girder w/ Steel Deck 4. Steel Girder w/ Conc Deck 5. Prestressed Beam w/ Conc Deck 6. Thru-Girder w/ Steel Deck
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UPRR Deck Girder Standard Depth-Top / Rail to Low Chord = 5-5 Steel Deck 69 ft Max Span Length
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Thru Girder Depth-Top / Rail to Low Chord = 4-6 Steel Deck 155 ft Max Span Length
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Superstructure Considerations TxDOT Design Requirements UPRR-BNSF Design Guidelines KCS Design Guidelines Composite and Non-Composite Design No Sacrificial Beams Design for 30 Ballast Ballast Depth for Concrete Tie
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Vertical Clearance Steel Deck Girder16.5 ft Steel Thru Girder-Bolt Bot Fl17.5 ft Prestressed Conc17.5 ft Hwy Over RR23.33 ft
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Design Development and Review Process with Railroads
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Railroad Underpass 30% Submittal - Exhibit A 60% Submittal 90% Submittal 100% PS&E Plans RR Agreement with Exhibit B
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30% Submittal - Exhibit A Preliminary: –Bridge Layout –Track Plan and Profile –Track Typical Sections Structure Type Selection Report –Thru Girder LOA Facilitate RR Review
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Structure Type Selection Report Required for Thru-Girder Design Factors Considered –Underpassing Roadway Width –Clear Zone –Vertical Clearance Consider All Options for Railroad
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RR Requirements Sheets
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60% Submittal Complete Bridge Plans Complete Mainline and ShooFly Track Plans and Profiles Railroad Track Standards Mainline and ShooFly Typical Sections
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60% Submittal, ctd Track Sections every 50 ft Division of Labor Sequence of Work
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90% Submittal Revised Complete Bridge Plans Revised Complete Mainline and ShooFly Track Plans and Profiles Mainline & ShooFly Typ Sections
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90% Submittal, ctd Track Sections every 50 ft All Parts of PS&E that Affect the Railroad All Specifications
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100% Submittal Complete PS&E That Affects RR Complete Bridge Plans Complete Mainline and ShooFly Track Plans and Profiles Mainline & ShooFly Typ Sections Sequence and Division of Work RR Agreement w/ Exhibit B Attachment
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Mainline Bridge Replacement Shoo-Fly Construction
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Track Plans & Sequence of Work Bridge Replacement on Mainline Longer Span and Increased Clearance Track Raise Shoo-Fly Construction Best Maintains RR Operations
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Track Design Speed Railroad Operating Dept Determines Speed Mainline & ShooFly Same Speed ? –Existing Conditions –Future Upgrades –Design Speed Agreement
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Railroad Track Grade Raise No Grade Raise is Desirable 6 Max Raise with Ballast Only Use Subballast for Greater Raises ShooFly Profile Grade Ballast Delivery May Be an Issue
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Bridge Design and Track Design Resources
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Bridge and Track Design Resources TxDOT and Individual Railroad Use TxDOT Annotated Guidelines –TxDOT Website BRG Project Development Web Page –BRG FTP Site AREMA and AASHTO
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Bridge and Track Design Resources UPRR, BNSF, KCS Guidelines and Standards Updated Requirements and Standards TxDOT Bridge FTP Site: –ftp://bridge:txdot1@ftp.dot.state.tx.usftp://bridge:txdot1@ftp.dot.state.tx.us –Railroad Bridge and Track Design
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Ballasted Track Construction Specification Bridge Division has a Reference Spec Available for Project Use Bridge Division is Working to Develop Statewide Special Spec
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Thank You
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Lloyd M. Wolf, P.E. 512-416-2279 lwolf@dot.state.tx.us
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Estimated Costs 2008 Bridge and Track
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Estimated Railroad Costs 2008 Steel Deck Girder =$350 / SF with Steel Deck Steel Thru Girder =$450 / SF with Steel Deck Prestressed Beam =$225 / SF with Concrete Deck
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Estimated Railroad Costs 2008 ShooFly Bridge with Open Deck = $350,000 / EA Temp Special Shoring = $60 / SF
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Estimated Railroad Costs 2008 Ballasted Track =$240 / LF with 1 ft Raise Ballasted Track =$170 / LF No Raise Ballasted Track =$45 / LF Removal
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Estimated Railroad Costs 2008 Turnout / Switch =$85,000 / EA Signal for Switch =$50,000 / EA Including Circuit
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Estimated Railroad Costs 2008 Engineering Design Review = $100-175,000 And Construction Inspection Railroad Flagging =$900 / Day
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Mainline Track Raise at Turnout
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Mainline Track Raise with Ballast Retainer
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