05 Lehr PPT
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D F I - C S C E F a l l S e m i n a rG e o t e c h n i c a l E n g i n e e r i n g a n d D e s i g n - B u i l d S E P T E M B E R 1 3 , 2 0 1 3
Overland Bridge Design-Build
Achieving Best Value Through Effective Collaboration Between Designer, Geotechnical
Engineer, and Contractor
Achieving Best Value ThroughAchieving Best Value Throughugh EE veEffectivetiEffectiEffecEffecOverland Bridge Design-Build
D F I - C S C E F a l l S e m i n a rG e o t e c h n i c a l E n g i n e e r i n g a n d D e s i g n - B u i l d S E P T E M B E R 1 3 , 2 0 1 3
D F I - C S C E F a l l S e m i n a rG e o t e c h n i c a l E n g i n e e r i n g a n d D e s i g n - B u i l d S E P T E M B E R 1 3 , 2 0 1 3
Design-Build is the Future
2012 2008
$784 Million
$1.1 Billion 59 D/B Contracts,
17 D/B Contracts
Increase in FDOT D/B Projects
D F I - C S C E F a l l S e m i n a rG e o t e c h n i c a l E n g i n e e r i n g a n d D e s i g n - B u i l d S E P T E M B E R 1 3 , 2 0 1 3
Achieving Best Value
Learning Objectives
1 2 4 3 Project
Understanding FDOT
Design-Build Process
Partnerships & Collaboration
Innovative Solutions
Project Understanding
Design-Build Process
Partnerships & Collaboration
Innovative Solutions
Project Understanding
Design-Build Process
Partnerships & Collaboration
Innovative Solutions
Overland Bridge Design-Build
Project Understanding
Design-Build Process
Partnerships & Collaboration
Innovative Solutions
Overland Bridge Design-Build
EAST WEST CENTRAL
Focus Regions
Project Understanding
Design-Build Process
Partnerships & Collaboration
Innovative Solutions
Overland Bridge Design-Build
Project Understanding
Design-Build Process
Partnerships & Collaboration
Innovative Solutions
FDOT Adjusted Score Based Selection Process
Phase I Phase II Price Proposal
Average Number of ELOI Submissions Per Project = 7.1 D/B Teams submit an Expanded Letter of Interest (ELOI)
FDOT provides each team with their detailed technical score and comments, Teams have 2 days to elect to proceed to Phase II
Average number of responsive firms selecting to proceed to Phase II = 4.8
Project Understanding
Design-Build Process
Partnerships & Collaboration
Innovative Solutions
FDOT Adjusted Score Based Selection Process
Phase I Phase II Price Proposal
Average number of firms submitting a Technical Proposal per project= 4.5
Final RFP Issued Alternative Technical Concept Meetings D/B Teams submit Technical Proposals
Contractor presents for “page turn” Meeting FDOT holds “Q&A” Meeting with Contractor
Project Understanding
Design-Build Process
Partnerships & Collaboration
Innovative Solutions
FDOT Adjusted Score Based Selection Process
Phase I Phase II Price Proposal
Bid Price Proposal Phase I + Phase II Scores
= Adjusted Score
*The firm with the lowest adjusted score will be selected.
FDOT pays stipends to D/B firms receiving top two numerically highest ELOI Scores
Average number of D/B Team’s submitting a price proposal per project = 4.5
Project Understanding
Design-Build Process
Partnerships & Collaboration
Innovative Solutions
Partnerships and Collaboration
Project Understanding
Design-Build Process
Partnerships & Collaboration
Innovative Solutions
Partnerships and Collaboration
Project Understanding
Design-Build Process
Partnerships & Collaboration
Innovative Solutions
WEST
N
Innovative Solutions – West Region
Project Understanding
Design-Build Process
Partnerships & Collaboration
Innovative Solutions
Innovative Solutions – West Region
Existing Condition D/B Concept
Single Column/Shaft Widening
Statnamic Testing Program
Project Understanding
Design-Build Process
Partnerships & Collaboration
Innovative Solutions
Fuller Warren Bridge Widening
• Single Column / Single Shaft Substructure Units.
• Non-Redundant Foundations • One SPT boring per shaft. • Additional pilot holes at each shaft. • Additional shaft inspection criteria. • Reduced resistance factor in design.
• Eliminated 51 shafts compared to redundant foundation alternative.
Project Understanding
Design-Build Process
Partnerships & Collaboration
Innovative Solutions
Fuller Warren Bridge Widening
• Increased shaft diameter. • Increased placement tolerance.
• Geotechnical Engineer worked to balance increased shaft diameter with shallower tip elevation.
• Statnamic Testing. • Resistance Factor increased
from 0.5 to 0.6. • Three tests performed for
2,600LF of foundation work.
Project Understanding
Design-Build Process
Partnerships & Collaboration
Innovative Solutions
Innovative Solutions – Central Region
CENTRAL
N
Project Understanding
Design-Build Process
Partnerships & Collaboration
Innovative Solutions
Innovative Solutions – Central Region
Existing Condition D/B Concept
Avoided Foundation Conflicts
Utility Tunnel Extension
Project Understanding
Design-Build Process
Partnerships & Collaboration
Innovative Solutions
Utility Tunnel Extension
• Three Sided CIP Tunnel under I-95. • Constructed in 1958. • Founded on timber piling.
• 25LF extension on North side.
• Adjacent to TV Station. • Vibration concerns.
Project Understanding
Design-Build Process
Partnerships & Collaboration
Innovative Solutions
Utility Tunnel Extension
• Micropiles selected for extension.
• Engaged specialty contractor during design phase.
• Collaborative effort to develop size of piles, details and specifications.
• 10 – 8” Diameter Micropiles.
• 106 TN Nominal Bearing Capacity.
Project Understanding
Design-Build Process
Partnerships & Collaboration
Innovative Solutions
Overland Bridge
Existing Foundations D/B Concept
Existing bridge foundations New construction
New abutment and pier locations avoid conflict and eliminate 214 pile extractions
Project Understanding
Design-Build Process
Partnerships & Collaboration
Innovative Solutions
Overland Bridge
• Initial Geotechnical Analysis recommended production pile lengths ranging from 40LF to 56LF.
• Required Driving through Weathered Limestone Layer.
Hard Driving Expected
Project Understanding
Design-Build Process
Partnerships & Collaboration
Innovative Solutions
Overland Bridge
• Actual Driving: • WOH for 15LF to 20LF. • Practical refusal at
hard limestone layer.
• Structural engineer and geotechnical engineer collaborate to complete lateral stability analysis and eliminate need for drilling.
Hard Driving Expected
Project Understanding
Design-Build Process
Partnerships & Collaboration
Innovative Solutions
Innovative Solutions – East Region
EAST
N
Project Understanding
Design-Build Process
Partnerships & Collaboration
Innovative Solutions
Innovative Solutions – East Region
Proposed Pier in Median of I-95
Existing Condition D/B Concept
Modified Footings to Eliminate Need for Pre-Drilling
Project Understanding
Design-Build Process
Partnerships & Collaboration
Innovative Solutions
Ramp K Flyover – Median Pier
Existing ExistingProposed
New Ramp
Maintain Access
Project Understanding
Design-Build Process
Partnerships & Collaboration
Innovative Solutions
Ramp K Flyover – Median Pier
Example of Skewed Pier Detail of Skewed Pier
Project Understanding
Design-Build Process
Partnerships & Collaboration
Innovative Solutions
Ramp K Flyover – Median Pier
I ti
• Footing skewed relative to ramp baseline to fit inside allowable work zone.
• Pile lengths limited by crane capacity.
• Full Dynamic Testing (PDA) used to minimize number of piling. • Phi increases from 0.65 to 0.75. • 410TN vs. 366TN NBR Value.
Project Understanding
Design-Build Process
Partnerships & Collaboration
Innovative Solutions
Ramp K Flyover – Post-Design Effort
vative
• Corner tension piles required considerable embedment.
• Lateral stability analysis required minimum tip elevation.
• Excessive drilling was needed to achieve required tip elevations.
• Redesigned footing, add 8 piles. • 364TN vs. 265TN NBR Value.
• Similar modification underway for nearby Ramp J Flyover footings.
More Hard Driving Conditions
D F I - C S C E F a l l S e m i n a rG e o t e c h n i c a l E n g i n e e r i n g a n d D e s i g n - B u i l d S E P T E M B E R 1 3 , 2 0 1 3
Thank You
D F I - C S C E F a l l S e m i n a rG e o t e c h n i c a l E n g i n e e r i n g a n d D e s i g n - B u i l d S E P T E M B E R 1 3 , 2 0 1 3