TRACK DESIGN AND

dearmeltedUrban and Civil

Nov 25, 2013 (3 years and 7 months ago)

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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