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CONSTRUCTION ESTIMATES

CONSTRUCTION ESTIMATES. 2014. Estimates. Estimates. Point of the illustration?. Document your assumptions . Estimate Types . Programming The project is in the concept phase. No schematic and little details are known. Schematic Known

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CONSTRUCTION ESTIMATES

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  1. CONSTRUCTION ESTIMATES 2014

  2. Estimates

  3. Estimates Point of the illustration? Document your assumptions.

  4. Estimate Types • Programming The project is in the concept phase. No schematic and little details are known. • Schematic Known • Geometrics (alignments V & H, super-elevations, typical sections), field survey, environmental constraints, traffic loading, bridge span length, retaining wall, etc. Unknowns • Final pavement design, phases of construction, detours, utility conflicts, final quantities • Final Plans All quantities are known, the unknown is the only unknown Required to be within 3% of the lowest bid (or write a justification) • Contractors Estimate Estimate based on the individual (contractor’s unique position)

  5. Bryan District Average Cost • $ 10 Million • $ 2.3 Million/ Mile • $ 1 Million/ Mile • $ 150,000 • $ 450,000/ EA • $ 12 Million/ Mile • Grade Separation • 2 Lane to 4 Lane • 2 Lane to Super 2 (passing zones) • Signal • Ramps • Freeway – Controlled Access

  6. Programming • Basic estimate (Programming) Structures (bridges, culverts, storm drains) Pavement • $/ mi (spread sheet) Signals ~ $ 150k/ EA Miscellaneous (erosion control, striping, signs, traffic control, etc.) • 10 – 20 % of known (subtotal 1) Engineering Contingencies • 6 – 11 % subtotal 2 Mobilization • 10 % subtotal 3

  7. Structures • Structures (400) Culverts (Item 462) Reinforced Concrete Pipe (Item 464) Inlets/ Manholes (Item 465) Headwalls/ Wingwall (Item 466) Safety End Treatment (Item 467) Retaining Walls (Item 423) • Average bid for items Go to www.txdot.gov search “low bid” Or http://www.txdot.gov/inside-txdot/division/general-services/bidding/average-low-bid-unit-prices.html

  8. Structures • Superstructure (beam type) http://www.txdot.gov/inside-txdot/division/bridge/specifications/super-design.html • Unit cost found here http://www.txdot.gov/inside-txdot/division/bridge/unit-cost.html • General programming estimate (for most structures, if specialized design use the links above for more information) Bridge • Cost = $ 75/ sf deck • includes all structure cost substructure and superstructure Culvert • Cost = low bid cost x length x 1.4 • 1.4 factor adjust for head wall, wing wall, special trenching, junctions etc. Embankment = $ 10/ cy Excavation = $ 3/ cy Wall = $ 50/ sf

  9. All other items • 100 – Earth Work and Landscape • 200 – Subgrade Treatments and Base • 300 – Surface Courses and Pavement • 400- Structures • 500 - Miscellaneous Construction • 600 – Lighting, Signing, Markings, and Signals • 700 – Maintenance Spec Book http://ftp.dot.state.tx.us/pub/txdot-info/des/specs/specbook.pdf

  10. Road cost / mi • See estimate spreadsheet (2014_est.xls)

  11. Local Projects

  12. Local Projects Construction = $ 5.9Million

  13. Local Projects

  14. Local Projects Construction = $ 23.5 M

  15. Local Projects

  16. Local Projects Construction = $ + 25 M

  17. Local Projects

  18. Further considerations • Considerations when Estimating Bridge Projects Is stage construction necessary? Is the replacement bridge on new alignment or the same? Will the replacement bridge have longer spans with deeper beams? If so, will the grade have to be raised for clearance (hydraulics or V.C.)? Will the contractor need special equipment for the project? Is a shoofly structure required for a railroad underpass? Will a pump station be required? Is there a shortage of materials (steel)? Is a relief structure also necessary?

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