Managing Mobility during Design-Build Highway Construction: Successes and Lessons Learned
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The document discusses managing mobility during the design-build reconstruction of the Dallas Horseshoe highway interchange project. It describes the project's high traffic volumes and constraints. It highlights the contractor's successes in maintaining access and maximizing work during limited closures. It stresses the importance of collaboration between the agency and contractor in developing traffic control plans and finding solutions to difficult situations.
Managing Mobility during Design-Build Highway Construction: Successes and Lessons Learned
- 1. COLLABORATE. INNOVATE. EDUCATE. Managing Mobility during Design- Build Highway Construction – Successes and Lessons Learned Duane Milligan, P.E. – TxDOT Kristopher Pruner – CTR
- 2. COLLABORATE. INNOVATE. EDUCATE. Design-Build Method • Schematic-level Design • Two-Step Procurement • Selected Design-Build Contractor responsible for final design as well as construction – Some construction begins while design in other areas is ongoing – Contractor develops Traffic Control Plans
- 3. COLLABORATE. INNOVATE. EDUCATE. Dallas Horseshoe Project Margaret McDermott Bridge • Upgrade Roadway Geometry • Replace IH 30 and IH 35E Bridges across Trinity River • Construct Additional Lanes • Construct Margaret McDermott Bridge
- 4. COLLABORATE. INNOVATE. EDUCATE. Horseshoe – Mobility Challenges • High Volume Interstate Highways – 460,000 average weekday traffic through project area • Constraints involving Houston Viaduct • Proximity to Downtown Dallas
- 5. COLLABORATE. INNOVATE. EDUCATE. Horseshoe – Successes • Traffic Control Plan designed in a way that generally maintained existing access or provided reasonable alternates • Contractor structured work to maximize the usefulness of each closure • No overnight closures lingered into the morning peak period
- 6. COLLABORATE. INNOVATE. EDUCATE. Horseshoe – Work during One Night • Work Completed during one night of full WB IH 30 and full NB IH 35E closure: – Set 7 Tx62 girders over westbound IH 30 on Bridge 45 – Set 8 Tx62 girders over northbound IH 35E on Bridge 10 – Placed temporary shoring and work platform for Houston Street arches, decking, and railing – Removed bridge overhangs for completed Jefferson Street railing – Removed existing high mast illumination pole – Placed 1000 lf of portable concrete barrier
- 7. COLLABORATE. INNOVATE. EDUCATE. Horseshoe – Work during One Night
- 8. COLLABORATE. INNOVATE. EDUCATE. Horseshoe – Work during One Night
- 9. COLLABORATE. INNOVATE. EDUCATE. Horseshoe – Work during One Night
- 10. COLLABORATE. INNOVATE. EDUCATE. Horseshoe – Work during One Night
- 11. COLLABORATE. INNOVATE. EDUCATE. Horseshoe – Work during One Night
- 12. COLLABORATE. INNOVATE. EDUCATE. Lessons Learned • Collaboration – Work with the contractor to find reasonable solutions to difficult situations • Tracking – Ongoing and persistent monitoring of lane closures
- 13. COLLABORATE. INNOVATE. EDUCATE. Tools to Protect Mobility • Stated Minimum Number of Lanes to be Maintained • Designated Allowable Closures • Liquidated Damages/Lane Rental Fees – Including an exemption amount (“Bank Balance”) • Collaborative relationship between TxDOT and the design-build contractor
- 14. COLLABORATE. INNOVATE. EDUCATE. Minimum Number of Lanes • Origin-Destination Table defines minimum number of lanes to be maintained during peak periods • Developed based on consideration of detours, planning, comparison of existing and proposed conditions # Origin Via Destination Minimum Number of Lanes to be maintained 1 NB IH 35E NB IH 35E NB IH 35E 2 Through Lanes 2 Colorado 1 Lane Exit or Detour 3 Riverfront 1 Lane Exit (2 Lanes for at least 200’ upstream of intersection) 4 Jefferson via HOV 0 (with interim HOV lane end and transition to main lanes near Louisiana) 5 Reunion 1 Lane Exit 6 EB IH 30 EB IH 30 2 Through Lanes either to EB IH 30 or EB IH 30 CD (or 1 lane to each) (If 2 Through Lanes only to EB IH 30, provide slip ramp east of Hotel Street to EB IH 30 CD)7 EB IH 30 CD EB IH 30 CD 8 Lamar/Griffin/Downtown Maintain Routes or Detour
- 15. COLLABORATE. INNOVATE. EDUCATE. Allowable Closures Table • Provides durations for which closures/detours may be in place • Paired with a table specifying liquidated damages for exceeding allowable durations # Origin Via Destination Description Allowable Closure Duration (Consecutive Calendar Days) 2 NB IH 35E NB IH 35E Colorado NB IH 35E access to Colorado east of IH 35E 90 Days 8 NB IH 35E EB IH 30 CD Lamar/Griffin/Downtown NB IH 35E access to downtown through the EB IH 30 CD 90 Days
- 16. COLLABORATE. INNOVATE. EDUCATE. Liquidated Damages and Lane Rental Fees • Liquidated Damages assessed for Time Period A closures • First $1,400,000 in Lane Rental Fees exempted (Time Periods B, C, and D) Northbound IH 35E (South of Mixmaster) Time Period A Liquidated Damages Per Hour Time Period B Lane Rental Fees Per Hour Time Period C Lane Rental Fees Per Hour Time Period D Lane Rental Fees Per Hour One Lane Closed $10,000 $2,000 $100 $50 Two Lanes Closed $20,000 $5,000 $500 $100 Three Lanes Closed $50,000 $20,000 $2,000 $500 Four Lanes Closed (Full Main Lane Closure) $100,000 $50,000 $5,000 $2,000 HourDay Sun Mon- Thu Fri Sat … … … … … 4:00 D D D D 5:00 D C C D 6:00 D A A C 7:00 C A A B 8:00 C A A B 9:00 C A A B 10:00 B B B B 11:00 B B B B 12:00 B B B B 13:00 B B B B 14:00 B B B B … … … … …
- 17. COLLABORATE. INNOVATE. EDUCATE. Collaborative Relationship • TxDOT and contractor met frequently during design process • Difficult areas reviewed jointly to develop solutions • Closures scheduled and discussed in advance • Documentation of actual closure times provided following each closure • Periodic, structured review of lane rental hours and fee calculations to make sure each party agrees with amounts
- 18. COLLABORATE. INNOVATE. EDUCATE. Keys to Success • Before/During Procurement – Evaluate mobility needs near beginning of procurement – Give clear direction to proposers in draft contract documents – Be open to feedback from proposers and consider changes
- 19. COLLABORATE. INNOVATE. EDUCATE. Keys to Success • During Design/Construction – Work collaboratively with the contractor during TCP design to make sure public’s needs are being met – Stay on top of tracking closures • Future Projects – Use lessons learned to improve later projects