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Transitioning to Accelerated Bridge Construction ABC as Standard Practice

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Transitioning to Accelerated Bridge Construction ABC as Standard Practice – PowerPoint PPT presentation

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Title: Transitioning to Accelerated Bridge Construction ABC as Standard Practice


1
Transitioning to Accelerated Bridge Construction
(ABC) as Standard Practice
  • by
  • Mary Lou Ralls, P.E.
  • Ralls Newman, LLC
  • Prefabricated Bridge Elements Systems (PBES)
    for ABC
  • WASHTO-X Videoconference
  • June 17, 2008

2
What is Accelerated Bridge Construction?
  • Building the bridge more quickly than your
    conventional practice, while maintaining quality
  • What that means to you depends on where you are
    now
  • ABC spans the entire process, from planning
    through construction

3
Examples of ABC - Planning
  • Early owner meetings with contractors suppliers
    to innovate
  • Right-of-way acquisition utility relocations
    before advertising project
  • Early environmental clearance permitting
  • Innovative contracting strategies in contract
    documents (e.g., AB bidding, lane rental,
    incentive/disincentive clauses)

4
Examples of ABC Planning, contd.
  • Electronic shop drawing submittal approval
    process
  • Procurement of materials before advertising
    project (e.g., prestressed concrete girders,
    structural steel girders)

5
Examples of ABC - Design
  • Prefabrication of bridge components or entire
    bridge
  • Geotechnical engineering enhancements (e.g.,
    mechanically-stabilized earth walls instead of
    conventional cantilever retaining walls
    reinforced or lightweight backfills)

6
Examples of ABC - Construction
  • Allowing contractor options to innovate
  • Use of innovative equipment (e.g., self-propelled
    modular transporters SPMTs to move entire
    bridge launching, pivoting, or skidding
    equipment)
  • Concurrent onsite engineering operations (e.g.,
    building abutments interior supports
    simultaneously)

7
Accelerated Bridge Construction
  • Replacement or new construction
  • Uses innovative design construction methods
    high performance materials
  • Reduces typical construction time
  • Maintains or enhances quality
  • Reduces traffic disruption
  • Increases work-zone safety
  • Produces cost-effective, long-lasting bridges
    with early openings

8
Prefabricated Bridges
  • One ABC method
  • Bridge elements or systems, or entire bridges,
    built at offsite locations
  • Controlled offsite environment assures quality
    construction
  • Transported to site quickly installed, e.g.,
  • Girders partial-depth deck panels
  • Full-depth precast deck panels
  • Superstructure systems
  • Substructure systems
  • Totally prefabricated bridges

9
Typical Prefabricated Elements
Partial-depth Deck Panels
Girders
10
Reduced Number of Superstructure Components by
Use of High Performance Materials
conventional 0.5-inch diameter strands
normal-strength concrete
0.6-inch diameter strands high-strength HPC
concrete
7 conventional beams Span No. 1 North Concho
Westbound Mainlanes San Angelo, Texas
4 HPC beams Span No. 1 North Concho Eastbound
Mainlanes San Angelo, Texas
11
Dead Run and Turkey Run Bridges on George
Washington Memorial Parkway, Virginia 1998
Weekend deck replacement
12
State Route 433 Lewis and Clark Bridge over
Columbia River, WA/OR 2004
Deck replaced with full-width, full-depth precast
deck panels
SPMTs with frame carrying panel
… with no impact to rush-hour traffic
After deck replacement
13
Superstructure Replacement of I-95 Bridge over
James River, Virginia - 2002
Prefabricated Superstructure System
required partial lane closures only
with no lane closures during rush-hour traffic
14
4500 South Bridge over I-215E, Utah - 2007
  • Prefabricated Superstructure
  • driven into position with SPMTs
  • I-215 closed over a weekend
  • 4500 South closed only 10 days

15
Newark International Airport Monorail, New
Jersey 2001
Prefabricated Substructure
16
I-287 Cross Westchester Expressway Viaducts, New
York 1999
Precast Concrete Substructure
17
State Highway 86 Bridge over Mitchell Gulch,
Colorado 2002
Precast concrete abutments, wingwalls, superstruct
ure units with railing, steel H piles
Early Saturday morning
Saturday afternoon
Saturday afternoon
18
Mill Street Bridge over Lamprey River, New
Hampshire 2004
Precast reinforced concrete substructure after
erection, prior to placing backfill
Placing spread footing segments
  • 10 footing segments
  • 11 abutment/wingwall segments
  • 7 prestressed HPC box beams

Erection of pretensioned concrete box beams
19
So, what does prefabricated bridges for
ABC mean to you in your city, or your county, or
your state?
20
One Example Texas Prefabricated Bridges for ABC
  • Extensive sets of conventional bridge standards
    (google TxDOT bridge standards)
  • Pretensioned concrete beam standards
  • I-beams
  • Slab beams
  • Box beams
  • U-beams
  • Structural steel I-beam standards
  • Partial-depth precast deck panel standards
  • Other supplemental bridge standards

21
One Example Texas Prefabricated Bridges for ABC,
contd.
  • ABC standards
  • Pretensioned concrete double-T beams updated
    2006
  • Pretensioned concrete decked slab beams
    released 2008
  • Project-specific prefab for ABC
  • Full-depth deck panels
  • Precast bent caps
  • Prefabricated superstructures
  • Totally prefabricated bridges

22
What does ABC as Standard Practice mean?
23
ABC as standard practice means considering ABC at
the initial planning stage of each project
  • Use FHWA Framework for Prefabricated Bridge
    Elements and Systems (PBES) Decision-Making
  • http//www.fhwa.dot.gov/bridge/prefab
  • or
  • Develop your own decision-making tool
  • Example Utah DOT Decision Chart

And having a business model in place to use ABC
as appropriate
24
  • FHWA
  • Decision-
  • Making
  • Framework
  • 3 formats
  • Flowchart
  • Matrix Questions
  • (yes-no-maybe)
  • QA Discussion

25
RAPID ONSITE CONSTRUCTION FACTORS Traffic Volume
/ Emergency / Commerce / User Delay ???
26
OTHER FACTORS Worker Safety / Wetlands-Air
Quality-Noise / Endangered Species / Multiple
Similar Sections ???
27
PBES CONSTRUCTION COSTS LESS ???
28
Decision-Making Matrix Example Questions
FHWA Decision-Making Framework
29
FHWA Decision-Making Framework
30
Utah DOT Decision Chart
31
How do you transition to ABC as Standard
Practice?
32
One Example Utahs Transition to ABC as Standard
Practice
  • Developed decision-making chart
  • Completed project-specific prefabricated ABC,
    e.g.,
  • Full-depth deck panels
  • Precast bent caps
  • Prefabricated superstructure installed with SPMTs
  • Conducted domestic scanning tours
  • Identified a program of ABC projects
  • Requested demonstration project funding

33
I-80 State Street to 1300 East Multiple
Structures, Salt Lake City
  • Anticipated 2008 Move Dates for SPMT Program of
    Projects
  • June 21-June 26 - Highland Drive
  • June 26-July 1 - 900 East Bridge
  • July 5-July 10 - 600 East Ramp Bridge
  • July 15-July 19
  • 600 East Bridge
  • 700 East Bridge
  • July 19-July 24 - 500 East Bridge
  • July 28-August 1 - 300 East Bridge

34
One Example Utahs Transition to ABC as Standard
Practice, contd.
  • Involved nationally
  • Developed first 2 sets of draft prefabricated ABC
    standards, specifications, design aids
  • Full-depth precast deck panels
  • Use of SPMTs to move superstructure spans
  • Hosted workshop with national experts local
    industry to receive recommendations
  • First 2 draft products
  • Transitioning to ABC as standard practice by 2010

35
One Example Utahs Transition to ABC as Standard
Practice, contd.
  • Revised first 2 sets of ABC standards products
  • Hosted local industry feedback meeting to further
    refine products to meet local needs
  • Updated products incorporated into upcoming
    projects
  • Maintaining communication with industry update
    standards products as needed

36
One Example Utahs Transition to ABC as Standard
Practice, contd.
  • Initiated development on 2nd round of
    prefabricated ABC standards products, including
    precast
  • Pretensioned girders
  • Parapets
  • Bent caps
  • Columns
  • Footings
  • Approach slabs

37
One Example Utahs Transition to ABC as Standard
Practice, contd.
  • Assessing implementing strategies to enhance
    performance of ABC by accelerating other areas,
    e.g.,
  • Project delivery (shortening time from funded
    concept to final constructed project)
  • Decision making during design construction
  • Construction of critical path non-bridge parts of
    projects
  • Continuing to consider workshop recommendations
    on transitioning to ABC

38
One Example Utahs Transition to ABC as Standard
Practice, contd.
  • Evaluating costs

39
One Example Utahs Transition to ABC as Standard
Practice, contd.
  • Communicating with the public

4500 South Bridge over I-215E Installed in One
Weekend
40
Summary on Transitioning to ABC as Standard
Practice
  • Become educated nationally internationally
  • Develop business model, including decision-making
    tool program of work
  • Seek funding for demonstration projects
  • Standardize prefabrication details
  • Use innovative contracting strategies
  • Educate communicate internally, with industry,
    with the public

41
Prefabricated bridges for Accelerated Bridge
Construction help transportation agencies achieve
their Mission To efficiently and
effectively move people, goods, and services
42
Prefabricated Bridges For Accelerated Bridge
Construction
Thank You
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