Bridge Development Report Cost Estimating General: The purpose of the Bridge Development Report is to select the most appropriate structure type for the site under consideration. One of the most important considerations is to select the most cost efficient efficient bridge to fit the unique circumstances at the site. The purpose of the procedure established in this chapter is to bring uniformity to the cost estimating portion of the decision making process. F or information purposes selected project cost data is provided in the appendix. The cost estimating procedure supplied herein should be used for all bridge structures with the exception of the structure types stated below. below. This process is not suitable for cost estimating structure structure types without repeatable bid history including including the following bridge types: movable; cable stayed; cast-in-place on form travelers; arches and tunnels. These very unique structures should be cost estimated by the use of fundamental process of developing cost based on labor, materials, equipment and construction time. This concept for cost estimating is a three-step process. The first step is to utilize the average unit material costs provided herein to develop a cost estimate based on the completed preliminary preliminary design. The second step is to adjust the total bridge cost for the unique site conditions by use of the site adjustment factors. The third and final step is to review the computed total bridge cost on a cost per square foot basis and compare this cost against the historical cost range for similar structure types. This three-step process should produce a reasonably accurate cost estimate for structure type selection. selection. However, if a site has a set of odd circumstances which will affect the bridge cost be sure to account for these unique site conditions in the estimate. If the estimated cost is outside outside the cost range in step three, three, documented reasons should be provided for the variance in cost. Cost Estimating Process: The applicability of this three-step process is explained explained in the general section. The process stated below is developed for estimating the bridge cost after the c ompletion of the preliminary design which includes member selection, member size and member reinforcing. reinforcing. This process will develop develop costs for the bridge superstructure and substructure substructure from beginning to end bridge. Costs for all other items including but not limited to the following are excluded from the costs provided in this chapter: mobilization, operation costs for existing bridge(s); removal of existing bridge or bridge fenders; lighting; walls; deck drainage systems; embankment; fenders; approach slabs; maintenance of traffic; load tests; bank stabilization.
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Bridge Development Report Cost Estimating Effective 6/03/2009 Step One: Estimate Component Items
Utilizing the cost provided herein, develop the cost estimate for each bridge type under consideration. A. Bridge Substructure 1. Prestressed Concrete Piling, (furnished and installed) **Size of Piling Cost per Lin. Foot 18" (Driven Plumb or 1" Batter ) $80 18" (Driven Battered) $90 24" (Driven Plumb or 1" Batter ) $105 24" (Driven Battered) $120 30" (Driven Plumb or 1" Batter ) $150 30" (Driven Battered) $160 Embedded Data Collector (each) $2,000
Quantity 0 0 0 0 0
Cost $0 $0 $0 $0 $0
0
$0 $0
Quantity 0 0 0 0 0 Subtotal
Cost $0 $0 $0 $0 $0 $0
Quantity
Cost $0 $0 $0 $0 $0 Cost $0 $0 $0 $0 $0 $0 Cost $0 $0 $0 $0 $0 $0 $0 $0
Subtotal
* When heavy mild steel reinforcing is used in the pile head add $250 to the piling cost. ** When microsilica is used add $6/LF to the piling cost 2. Steel Piling, (furnished and installed) Size of Piling Cost per Lin. Foot 14" x 73 H Section $65 14" x 89 H Section $75 20" Pipe Pile $90 24" Pipe Pile $96 30" Pipe Pile $160
3. Drilled Shaft (Total in-place cost) Dia. (on land, casing salvaged) 3 ft 4 ft 5 ft 6 ft 7 ft Dia. (in water, casing salvaged) 3 ft 4 ft 5 ft 6 ft 7 ft 8 ft Dia. (in water, permanent casing) 3 ft 4 ft 5 ft 6 ft 7 ft 8 ft 9 ft
Cost per Lin. Foot $290 $430 $510 $630 $750 Cost per Lin. Foot $320 $500 $600 $690 $800 $1,100 Cost per Lin. Foot $460 $625 $750 $950 $1,100 $1,500 $1,800
Quantity
Quantity
Subtotal
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A. Bridge Substructure (continued) 4. Sheet Piling Walls Size (Prestressed Concrete) 10" x 30" 12" x 30" Type (Steel) Permanent Cantilever Wall Temporary Cantilever Wall Soil Anchors Permanent Temporary
Cost per Lin. Foot $100 $125 Cost per Sq. Foot $27 $16 Cost per Anchor $3,200 $2,800
Quantity
Quantity
Quantity
Subtotal
Cost $0 $0 Cost $0 $0 Cost $0 $0 $0
5. Cofferdam Footing (Cofferdam and Seal Concrete)
Prorate the cost provided herein based on area and depth of water. A cofferdam footing having the following attributes cost $328,000: Area 63 ft. H37.25 ft.; Depth of seal 5 ft.; Depth of water over the footing 16 ft. Subtotal $0 6. Substructure Concrete Type Concrete Mass Concrete Seal Concrete Shell Fill
Cost per Cubic Yard $875 $788 $650 $30
Quantity
Subtotal
Cost $0 $0 $0 $0 $0
Admixtures: For Calcium Nitrite add $40/cy (@4.5 gal/cy)and for For silica fume add $40/cy (@ 60 lb./cy) when cast-in-place and $48/cy when precast 7. Reinforcing Steel Type Reinforcing Steel
Cost per Pound $1.12
Quantity Subtotal
Substructure Subtotal
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Cost $0 $0
$0
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B. Bridge Superstructure 1. Bearing Material Type Neoprene Bearing Pads Multirotational Bearings (kips) 1- 250 251- 500 501- 750 751-1000 1001-1250 1251-1500 1501-1750 1751-2000 >2000
Cost per Cubic Foot $650 Cost per Each $3,000 $3,900 $4,600 $5,200 $6,800 $8,000 $9,000 $11,000 $14,000
Quantity Quantity
Subtotal 2. Bridge Girders Structural Steel (includes coating) *Rolled Wide Flange Sections *Plate Girders, Straight *Plate Girders, Curved *Box Girders, Straight *Box Girders, Curved
Cost per Pound $1.75 $1.80 $2.00 $2.15 $2.25
Quantity
* When weathering steel (uncoated) is used reduce the price by $0.04per pound. Inorganic zinc coating systems have an expected life cycle of 20 years. Prestressed Concrete Girders Cost per Lin. Foot Quantity AASHTO Type II $165 AASHTO Type III $175 AASHTO Type IV $190 AASHTO Type V $225 AASHTO Type VI $250 Fl. Bulb-Tee 54" $160 Fl. Bulb-Tee 63" $170 Fl. Bulb-Tee 72" $190 Fl. Bulb-Tee(M) 78" $220 Florida-I 36" $190 Florida-I 45" $205 Florida-I 54" $220 Florida-I 63" $235 Florida-I 72" $250 Florida-I 78" $260 78" Haunched Units(C.J.-C.J.) $580 Fl. Double Tee 18" $205 Fl. Double Tee 24" $220 Fl. Double Tee 30" $270 Fl. Inverted Tee 16" $80 Fl. Inverted Tee 20" $90 Fl. Inverted Tee 24" $105 Fl. Tub (U-Beam) 48" $700 Fl. Tub (U-Beam) 54" $750 Fl. Tub (U-Beam) 63" $800 Fl. Tub (U-Beam) 72" $900 Solid Flat Slab (36"x15") $220 Solid Flat Slab (36"x18") $230 Subtotal 09/15/2010
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Cost $0 Cost $0 $0 $0 $0 $0 $0 $0 $0 $0 $0
Cost $0 $0 $0 $0 $0
Cost $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 $0 6/11
*Price is based on ability to furnish products without any conversions of casting beds and without purchasing of forms. If these conditions do not exist, add the following cost: Inverted Tee $202,000: Fl. Tub - $403,000
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B. Bridge Superstructure (continued) 3. Cast-in-Place Superstructure Concrete Type Cost per Cubic Yard Box Girder Concrete, Straight $1,250 Box Girder Concrete, Curved $1,400 Deck Concrete $850
Quantity
Subtotal 4. Concrete for Precast Segmental Box Girders, Cantilever Construction Concrete Cost by Deck Area Cost per Cubic Yard Quantity $1,230 < 300,000 SF $1,200 > 500,000 SF $1,175 Values Between (var. linearly) Subtotal 5. Reinforcing Steel Type Reinforcing Steel
Cost per Pound $1.10
Quantity Subtotal
6. Post-Tensioning Steel Type Strand, Longitudinal Strand, Transverse Bars
Cost per Pound $2.35 $4.00 $6.00
Quantity
Subtotal 7. Railings and Barriers Type Traffic Barrier Pedestrian Railing Bicycle Railing* * For Metal Railing add $38/LF 8. Expansion Joints Type Strip Seal Finger Joint <6" Finger Joint >6" Modular 6" Modular 8" Modular 12"
Cost per Lin. Foot $115 $80 $85
Quantity
Subtotal
Cost per Lin. Foot $150 $850 $1,500 $500 $700 $900
Quantity
Subtotal Superstructure Subtotal
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Cost $0 $0 $0 $0
Cost $0 $0 $0 $0
Cost $0 $0
Cost $0 $0 $0 $0
Cost $0 $0 $0 $0
Cost $0 $0 $0 $0 $0 $0 $0
$0
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C. Miscellaneous Items 1. MSE Walls Type Permanent Temporary
2. Sound Barriers Type Post and Panel Sound Barriers
3. Detour Bridges Type Acrow Detour Bridge
Cost per Sq. Foot Quantity $27 $16 Walls Subtotal
Cost $0 $0 $0
Cost per Sq. Foot Quantity $30 Sound Barrier Subtotal
Cost $0 $0
Cost per Sq. Foot Quantity $55 Detour Bridge Subtotal
Cost $0 $0
The cost to construct a detour bridge using FDOT supplied components is provided herein. The cost is for the bridge proper. Excluded from this cost is the following: Approach work; Surfacing; Guardrail. Unadjusted Total
$0
Step Two: Estimate Conditional Variables and Cost per Square Foot
complete the construction of the entire cross section of the bridge. The 20 percent premium is applied to the effected units of the superstructure and/or substructure.
% Increase/ Conditional Variables Decrease Rural construction, decrease cost by 6 %. -6% Urban construction, increase cost by 6 %. * 0% For construction over water, increase cost by 3 %. 3% 5% Phased construction or widening, increase by 20 %.** 2% *Broward, Dade, Duval, Hillsborough, Orange, Palm Beach, and Pinellas counties)
Cost (+/-)
$0 $0 $0 $0 $0
** Phased construction is defined as construction over traffic or construction requiring multiple phases to complete the construction of the entire cross section of the bridge. The 20 percent premium is applied to the effected units of the superstructure and/or substructure.
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Substructure Subtotal Superstructure Subtotal Walls Subtotal Sound Barrier Subtotal Detour Bridge Subtotal Conditional Variables Total Cost
$0 $0 $0 $0 $0 $0 $0
Total Square Feet of Deck
0
Cost per Square Foot
$0
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Design Aid for Determination of Reinforcing Steel
In the absence of better information, use the following quantities of reinforcing steel per cubic yard of concrete. Location Pile Abutments Pile Bents
Pounds of Steel 135 145
Cubic Yds. 0 0
Tot. Pounds 0 0
Single Column Piers >25' Single Column Piers <25'
210 150
0 0
0 0
Multiple Column Piers >25' Multiple Column Piers <25' Bascule Piers
215 195 110
0 0 0
0 0 0
Standard Deck Slabs Isotropic Deck Slabs
205 125
0 0
0 0
Concrete Box Girders, Pier Seg Concrete Box Girders, Typ. Seg Flat Slabs @ 30ft & 15" Deep
225 165 220
0 0 0
0 0 0
Step Three: Cost Estimate Comparison to Historical Bridge Cost The final step is a confirmation of the cost estimate by comparison with historic bridge cost based on a cost per square foot. These total cost numbers are calculated exclusively for the bridge cost as defined in the General Section of this chapter. Price computed by Steps 1 and 2 should be generally within the range of cost as supplied herein. If the cost falls outside the provided range, good justification should be provided.
Bridge Superstructure Type Short Span Bridges: * Reinforced Concrete Flat Slab- Simple Span * Pre-cast Concrete Slab - Simple Span Medium Span Bridges: *Concrete Deck / Steel Girder - Simple Span *Concrete Deck / Steel Girder - Continuous Span * Concrete Deck / Prestressed Girder - Simple Span *Concrete Deck / Prestressed Girder - Continuous Span *Concrete Deck / Steel Box Girder Span range from 150' to 280' (for curvature, add 15% premium Segmental Concrete Box Girders - Cantilever Construction Span range from 150' to 280' Steel Box Deck/Girder Movable Bridge - Bascule Spans & Piers Demolition Costs: Typical Bascule Project Type Widening (Construction Only)
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Total Cost per Square Foot Low High
$122 $115
$160 $200
$125 $135 $85 $115 $145
$135 $170 $155 $211 $225
$130
$160
$1,800
$2,000
$35 $60
$60 $70
$115
$175
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* Increase the cost by twenty percent for phased construction Estimated Cost per Square Foot
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