I-485/ I-85 Interchange Charlotte, NC December 6, 2014
North Carolina
I-485/I-85 Interchange Charlotte Charlotte 485 Outer Loop
Partners The North Carolina Department of Transportation STV/Ralph Whitehead Associates The Lane Construction Corporation
1980 s 2003 constructed by Lane/Rea 1980 s-ncdot Original Design
RFP Design-4 Level Stack
High level, long span bridges 2M CY borrow for approach fills High MSE walls Detour I-85 traffic Icing Future widening RFP Design-4 Level Stack Challenges
Turbine Design Proposed as an alternate design Based on a European model Similar designs in FL and UK All left turning traffic - circles counter-clockwise around intersecting roads at relatively high speed Uses simple span, low level bridges, smaller structural members 2 level lower embankments, flatter roadway profiles Future widening easier, less costly
Thorpe, England, UK Tampa FL I-4 and I-75 Similar designs in service
Conceptual Rendering
Awarded September 2010 I-485 (Charlotte Eastern Outer Loop)/ I-85 NCDOT Project #: C202523, TIP Project R-2123CE Company Bid Price Score Adjusted Score The Lane Construction Corp. $92,162,250 94.5 $77,102,938 Engineer s Estimate $124,291,688 TOTAL SAVINGS: $32,129,438 Completion Date December 2014
Major Quantities Earthwork PCCP-Jointed Doweled Asphalt Pavement Drainage Structures Box Culvert Construction Sound wall 1,540,000 CY 196,000 SY 164,000 TN 29,400 LF 19 Bridges (1 Steel) 580 FT 2,040 LF
Cost Savings 2M CY borrow job became a balance job Low level, simple span bridges Minimized traffic control, temporary routes and closures Shared resources
Segment 1 Segment 3 Segment 2 Earthmoving confined within segments/no on-road hauling
Single spans
Simple span girder erection
Short duration night time closures
Awards Roads and Bridges 2012 Top 10 Roads - #1
October 2011
May 2012
January 2013 October 2012 -Looking east from future 485
June 2013
January 2014
May 2014
October 2014
Concrete Paving
Concrete Plant
Concrete Plant
Concrete Pavers GZ 850 with DBI
Concrete Pavers GZ 850 with DBI
Concrete Pavers GZ 850 with DBI
Concrete Pavers GZ 600
Innovation Stringless Paving Next Generation Concrete Surface Slurry Disposal Line Laser Profiler/ProVAL MIT T2 to locate dowel array
Stringless Paving
Traditional Wireline
Stringless Paving Total stations backsight the control points and frontsight paver with x,y,z locations. On-board computer calculates a new frontsight to coincide with the model and instructs the paver to adjust steering and elevation accordingly. Control Pt. (3) Total Stations 3 rd UTS used to check behind paver
Control point Control point Optimal handoff distance between total stations Control point Control point Control point
UTS cluster configuration_check behind paver
Next Generation Concrete Surface
NGCS test section
NGCS-3 step process
Slurry disposal
Hydraulic filtering press
Lined evaporating basin
Liteweight Laser Profiler
Roline line laser
ProVAL ride quality reporting
MIT T2 device
Northbound Southbound I-85 added lanes
Low profile simple span bridges
Be Safe!