RAILROAD BRIDGE AND
TRACK DESIGN AND
COORDINATION ISSUES
Lloyd M. Wolf, P.E.
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
Structure Type
Selection
and
Bridge Design
Superstructure Considerations
•
Safety
–
Highway Users
–
Railroad
•
Required Span for Horizontal Clearance
–
Column Protection
•
Adequate Vertical Clearance
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
UPRR Deck Girder Standard
•
Depth
-
Top / Rail to Low Chord = 5’
-
5”
•
Steel Deck
•
69 ft Max
Span Length
Thru Girder
•
Depth
-
Top / Rail to Low Chord = 4’
-
6”
•
Steel Deck
•
155 ft Max
Span Length
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
Vertical Clearance
•
Steel Deck Girder
16.5 ft
•
Steel Thru Girder
-
Bolt Bot Fl
17.5 ft
•
Prestressed Conc
17.5 ft
•
Hwy Over RR
23.33 ft
Design Development
and Review
Process
with Railroads
Railroad Underpass
•
30% Submittal
-
Exhibit “A”
•
60% Submittal
•
90% Submittal
•
100% PS&E Plans
RR Agreement with Exhibit “B”
30% Submittal
-
Exhibit “A”
•
Preliminary:
–
Bridge Layout
–
Track Plan and Profile
–
Track Typical Sections
•
Structure Type Selection Report
–
Thru Girder
•
LOA Facilitate RR Review
Structure Type Selection
Report
•
Required for Thru
-
Girder
•
Design Factors Considered
–
Underpassing Roadway Width
–
Clear Zone
–
Vertical Clearance
•
Consider All Options for Railroad
RR Requirements Sheets
60% Submittal
•
Complete Bridge Plans
•
Complete Mainline and ShooFly
Track Plans and Profiles
•
Railroad Track Standards
•
Mainline and ShooFly Typical
Sections
60% Submittal, ctd
•
Track Sections every 50 ft
•
Division of Labor
•
Sequence
of Work
90% Submittal
•
Revised Complete Bridge Plans
•
Revised Complete Mainline and
ShooFly
•
Track Plans and Profiles
•
Mainline & ShooFly Typ Sections
90% Submittal, ctd
•
Track Sections every 50 ft
•
All Parts of PS&E that Affect the
Railroad
•
All Specifications
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
Mainline Bridge
Replacement
Shoo
-
Fly Construction
Track Plans & Sequence of
Work
•
Bridge Replacement on Mainline
•
Longer Span and Increased
Clearance
•
Track Raise
•
Shoo
-
Fly Construction Best
Maintains RR Operations
Track Design Speed
•
Railroad Operating Dept
Determines Speed
•
Mainline & ShooFly Same Speed ?
–
Existing Conditions
–
Future Upgrades
–
Design Speed Agreement
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
Bridge Design
and
Track Design
Resources
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
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.us
–
Railroad Bridge and Track Design
Ballasted Track Construction
Specification
•
Bridge Division has a Reference
Spec Available for Project Use
•
Bridge Division is Working
to Develop Statewide
Special Spec
Thank
You
Lloyd M. Wolf, P.E.
512
-
416
-
2279
lwolf@dot.state.tx.us
Estimated Costs 2008
Bridge
and
Track
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
Estimated Railroad Costs 2008
ShooFly Bridge
with Open Deck =
$350,000 / EA
Temp Special
Shoring = $60 / SF
Estimated Railroad Costs 2008
Ballasted Track =
$240 / LF
with 1 ft Raise
Ballasted Track =
$170 / LF
No Raise
Ballasted Track =
$45 / LF
Removal
Estimated Railroad Costs 2008
Turnout / Switch =
$85,000 / EA
Signal for Switch =
$50,000 / EA
Including Circuit
Estimated Railroad Costs 2008
Engineering Design Review = $100
-
175,000
And Construction Inspection
Railroad Flagging =
$900 / Day
Mainline Track Raise at Turnout
Mainline Track Raise with Ballast Retainer
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