Accelerated Precast Construction Pavements...Accelerated Precast Construction Fundamentals...
Transcript of Accelerated Precast Construction Pavements...Accelerated Precast Construction Fundamentals...
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Accelerated Precast Construction
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The use of innovative scheduling, delivery, design,
manufacturing and construction methods to reduce onsite
construction time and costs, while improving safety and
reducing road user impacts.
Accelerated Precast Construction (APC)
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Replacing/Repairing Aging State, City and County Short Span
Bridges and Culverts across our Nation’s Waterways
Focus of Accelerated Precast Construction
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Reduce
Reduce Road User Impacts
Reduce Costs
Reduce Construction Time
Reduce Weather Related Time Delays
Improve
Improve Durability/Quality
Improve Work Zone Safety
Minimize
Minimize Environmental Impact
Minimize Impact to Existing Roadway Alignment
Accelerated Precast Construction Fundamentals Attributes
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Reduce Road User Impacts/Traffic Impacts
Bridge Widening - Arkansas
Bridge Replacement - Missouri
Minimizes Traffic Delays – Reduce Construction Equipment Distraction
Minimizes Community Disruption – Reduced Detours, Closures
– Reduced Narrow Lanes
Shorten Project Duration
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Reduce Costs to Society
Actual Costs – Reduced Costs through
Repetitive Use
– Shift from Dangerous to
Safe Area
Penetrations Eliminate CIP Structures
I-20 Bridge Replacement – GDOT Quad 12’x10’ Bridge Replacement
Costs Due to Delays – Reduce Construction Time
– Reduce Delays in Construction Zone
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Precast Concrete Beam (Remove from Critical Path)
Reduce Onsite Construction Time
Multi-Barrel 8’x3’ RCB Reduces onsite time
Cast in Place vs Precast
Critical Path – Simultaneous Construction
Safety – Worker Safety
– Motorists Safety
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Reduce Weather-Related Time Delays
Wet/Cold Weather Delay – Manufacture in Controlled
Environment
Predictable Schedule – Simultaneous Actions
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Improve Quality
Prefabricated in a Controlled
Environment
– Temperature, Humidity, Rain and Wind
Increased Quality Control
– Inspect Prior to Installation
Crew Tenure
– Quality/Durability/Consistency
Reinforcement/Curing/Testing
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Minimize Impact to Roadway Alignment
Reduced MOT
– Minimize Amount of Displacement
– Increased Safety
Temporary Alignment
Trenchless Installation
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Improve Work Zone Safety
Motorist Safety
– Minimize Amount of Labor at Site
– Reduced Construction Presence
Construction Worker Safety
– Reduced Time on Job Site
– Construction w/out Traffic
Quad 12’x10’ RCB - Oxford, AL
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Permitting
– Reduced Impact on Waterways
ROW Take
– Reduced Construction Limits
Reduced Utility Relocation
– Possibly Eliminated
Minimize Environmental Impact
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Empower DOT/Public Works/Contractors
Stretch Budget Dollars
Replace Bridges/Failed Culverts
Provide Cost Saving Options
Increased Number of Projects
Innovative/Competitive Options
Provide Practical Options
Value Engineering
Accelerated Precast Construction Fundamentals Benefits
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Empower DOTD Curved Alignment
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Single 6’ x 5’
Curved Alignment
Shop Drawing/Plan View
Empower DOTD Curved Alignment
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Single 6’ x 5’
Curved Alignment
Empower DOTD Curved Alignment
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Empower DOTD/Contractors
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www.concrete-pipe.org
Empower DOTD/Contractors
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54 inch
reinforced
concrete pipe
culvert under
Route 4
Rinker Material Concrete
Pipe with steel bands
and grouting ports to
withstand the anticipated
400,000 lb. jacking load.
DELAWARE DOT
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Empower DOTD/Contractors Trenchless Installation
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Trenchless Installation
Minimize Impact to Drivers
Increase Safety of Contractors
Reduce Construction Time
Empower DOTD/Contractors Trenchless Installation
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Value Engineering Proposal
Submitted by Contractor
Jack & Tunnel Proposed In Lieu of Open Cut
Advantages
Cost Savings - $126,330
Reduced M.O.T. and No Lane Shifts
Increased Work Zone Safety
No Supporting of Existing Utilities Required
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Empower DOTD
Pipe Jacking Reduce
Reduce Road User Impacts
Reduce Costs
Reduce Construction Time
Reduce Weather Related Time Delays
Improve
Improve Durability/Quality
Improve Work Zone Safety
Minimize
Minimize Environmental Impact
Minimize Impact to Existing Roadway Alignment
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Factors 1. Nature of soil, water table &
effects of dewatering
2. Jacking/Receiving Pit
3. Length, alignment and
outside dimension of pipeline
4. Jacking Forces
5. Pipe Joints
6. Loads on shield and pipe
7. Size of overbore
8. Lubrication
9. Grouting
10. Spoils Removal
Empower DOTD/Contractor
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Empower Public Works Dept
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Multi-Cell
Reduces Installation Time
Requires Greater Lift Capability
Precast Headwall Attached
Empower Public Works Dept
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23’ x 8’ Reducer
Large Box Culverts
Allowed per Special Design
Up to 24’ Span (Wet Cast)
Requires Greater Lift Capability
Empower Public Works Department
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Features
Triple Barrel CMP
Vertical Curve with Highpoint
Roadway Washes Away Each Event
Empower Contractors
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Features
Seven Barrel RCB Low Water Crossing
Replaced Triple Barrel CMP
Concrete Driving Surface with Curb
Rock Face Aesthetic Look
Empower Contractors
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Features Seven Barrel RCB Low Water Crossing
Replaced Triple Barrel CMP
Concrete Driving Surface with Curb
Rock Face Aesthetic Look
Empower Contractors
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Empower Contractors (6x5/8x5/75’ fill)
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Innovations
Precast Fitting Saves Money + Time
Versus Cast in Place
Empower Contractors
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Accelerated Precast Construction
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“Self Consolidating Concrete is a highly
flowable, non-segregating concrete that
can flow into place, fill the formwork,
and encapsulate the reinforcement
without any mechanical consolidation.”
ACI International, Committee 237 SCC
Self Consolidating Concrete
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SCC fills the formwork
without vibration and with a
significant reduction in labor.
What this means is that
SCC is much more
than flowable concrete
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Key Properties of SCC
Thixotrophic Semi solid at rest/fluid in motion
Viscosity Material property that resist change in shape/arrangement of
elements during flow
Dynamic Stability
Characteristic that ensures uniform distribution during transport.
Static Stability
Characteristic that ensures uniform distribution at rest
Admixtures
HRWR Polycarboxlylate Superplasticizer
VMA
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Key Properties of SCC
Filling ability - The ability of the concrete to flow freely under its own weight, and to completely fill formwork of any dimension and shape without leaving voids
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Passing Ability – The ability of concrete to flow freely in and around dense reinforcement without blocking
Key Properties of SCC
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Key Properties of SCC Resistance to Segregation – During placement and while
flowing, the concrete should retain its stability. There should be no separation of aggregate from paste or water from solids and no tendency for coarse aggregate to sink downwards through the fresh concrete mass under gravity
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40 PRODUCTION
Quality Control
• Make a commitment to QC
• Train key personnel in the “look and feel” of good SCC
• Continually evaluate stability
• Maintain control charts to establish materials and process control
• Test as required for your materials and process control
VSI = 0 VSI = 3
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PRECAST PROJECTS
Fredericksburg, VA
2001
SCC Arch Bridge (45’)
5,000 psi
Comp. Strength (psi)
7,390/7,670/8,020
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Drilled Shafts
• Route 28 over the Broad Run
• Two Bridges, 2006-2007
• Each bridge has two abutments, two piers for a total of 24 drilled shafts.
• In one bridge, 12 drilled shafts has SCC
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Drilled Shaft – Route 28
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REPAIR (Piles/Substructure)
Colonial Parkway
Route 712
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REPAIR - Pile
Colonial Parkway, Jamestown (VDOT)
October 2009
Barge Damaged Pile
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Colonial Parkway, Jamestown (VDOT)
October 2009
Barge Damaged Pile
Repaired w/SCC
REPAIR - Pile
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Route 712 over Route 29 Bypass
Cap Needs Repair
Pile Needs Repair
REPAIR - Substructure
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Route 712 over Route 29 Bypass
Formwork Tightness
Formwork Strength
REPAIR - Substructure
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Route 712 over Route 29 Bypass
Placed from Bridge
Funnel/Flexible Pipe
REPAIR - Substructure
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Route 712 over Route 29 Bypass
Clean Smooth Finish
Matches Existing
REPAIR - Substructure
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Faster Placement
Safety – Fewer People on scaffolds and forms for placement
Better Consolidation & Finish
Little or No Vibration
Early Strength
Increased Productivity
SCC WORKS BECAUSE…
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Reduced Labor
Decreased Time Improved Quality
Productivity Gains
Higher Quality
SCC WORKS BECAUSE…
SCC is Concrete
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Training
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Concrete Pipe Week
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Plant Tours
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Why Consider
Accelerated Precast Construction?
The traveling public deserves it. FHWA is promoting it.
ACPA wants to team with FHWA. Our Industry Provides it.