construction estimates
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
2014
CONSTRUCTION ESTIMATES2014
2014
Estimates
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2014
Estimates
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Point of the illustration?
Document your assumptions.
2014
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 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)
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2014
Bryan District Average Cost
Grade Separation
2 Lane to 4 Lane
2 Lane to Super 2 (passing zones)
Signal
Ramps
Freeway – Controlled Access
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$ 10 Million
$ 2.3 Million/ Mile
$ 1 Million/ Mile
$ 150,000
$ 450,000/ EA
$ 12 Million/ Mile
2014
Programming
Basic estimate (Programming to preliminary Schematic)– 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
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2014
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
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2014
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
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All 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 – MaintenanceSpec Book http://ftp.dot.state.tx.us/pub/txdot-info/des/specs/specbook.pdf
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2014
Pavement cost / mi
See estimate spreadsheet (2014_est.xls)
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Further considerations
Considerations when Estimating Bridge Projects1. Is stage construction necessary?2. Is the replacement bridge on new alignment or the same?3. 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.)?
4. Will the contractor need special equipment for the project?5. Is a shoofly structure required for a railroad underpass?6. Will a pump station be required?7. Is there a shortage of materials (steel)?8. Is a relief structure also necessary?
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2014
Local Projects
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2014
Local Projects
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Construction = $ 5.9Million
2014
Local Projects
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2014
Local Projects
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Construction = $ 23.5 M
2014
Local Projects
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2014
Local Projects
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Construction = $ ?? M
2014
Local Projects
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2014 19