Northern Arizona University

Senior Capstone Project Spring 2006

Our first set of design alternatives featured the Earthen roadway that was suggested by the City of Flagstaff as well as a hybrid design featuring a small span bridge and a significant amount of fill.

Design Alternatives

Fill Roadway

 

 

 

 

 

 

Material

Quantity

 

Unit Cost

Cost

Contingency

Est. Cost

Earth Fill Excavation, Load

1000

Cubic Yards

35

35000

0.1

38,500

Backfill

1000

Cubic Yards

35

35000

0.1

38,500

24" Corrugated Metal Pipe 70 ft length

2

Pipes

15

2100

0.1

2,310

Geotechnical Analysis

1

Report

10000

10000

0.1

11,000

3" Thick Asphalt Road Surface

10

Cubic Yards

250

2500

0.1

2,750

Railing

300

Feet

70

21000

0.1

23,100

 

 

 

 

105600

0.1

116,160

Combination Fill and Pre-Fab Steel Bridge

 

 

 

 

 

 

 

 

 

 

 

 

 

Material

Quantity

 

Unit Cost

Cost

Contingency

Est. Cost

Earth Fill Excavation, Load

600

Cubic Yards

35

21000

0.1

23,100

Backfill

600

Cubic Yards

35

21000

0.1

23,100

Reinforced Concrete Abutment

20

Cubic Yards

400

8000

0.1

8,800

Concrete Apron

1.5

Cubic Yards

225

337.5

0.1

371.25

Geotechnical Analysis

1

Report

10000

10000

0.1

11,000

3" Thick Asphalt Road Surface

10

Cubic Yards

250

2500

0.1

2,750

Railing

160

Feet

70

11200

0.1

12,320

Prefabricated Steel Bridge

1

Bridge

95000

95000

0.1

104,500

 

 

 

 

169038

0.1

185,941

Combination Fill and Pre-Fab Concrete Bridge

 

 

 

 

 

 

 

 

 

 

 

 

 

Material

Quantity

 

Unit Cost

Cost

Contingency

Est. Cost

Earth Fill Excavation, Load

600

Cubic Yards

35

21000

0.1

23,100

Backfill

600

Cubic Yards

35

21000

0.1

23,100

Reinforced Concrete Abutment

20

Cubic Yards

400

8000

0.1

8,800

Concrete Apron

1.5

Cubic Yards

225

337.5

0.1

371.25

Geotechnical Analysis

1

Report

10000

10000

0.1

11,000

3" Thick Asphalt Road Surface

10

Cubic Yards

250

2500

0.1

2,750

Railing

160

Feet

70

11200

0.1

12,320

Prefabricated Concrete Bridge

222

Cubic Yards

400

88800

0.1

97,680

 

 

 

 

162838

0.1

179,121

Combination Fill and Pre-Fab Timber Bridge

 

 

 

 

 

 

 

 

 

 

 

 

 

Material

Quantity

 

Unit Cost

Cost

Contingency

Est. Cost

Earth Fill Excavation, Load

600

Cubic Yards

35

21000

0.1

23,100

Backfill

600

Cubic Yards

35

21000

0.1

23,100

Reinforced Concrete Abutment

20

Cubic Yards

400

8000

0.1

8,800

Concrete Apron

1.5

Cubic Yards

225

337.5

0.1

371.25

Geotechnical Analysis

1

Report

10000

10000

0.1

11,000

3" Thick Asphalt Road Surface

10

Cubic Yards

250

2500

0.1

2,750

Railing

160

Feet

70

11200

0.1

12,320

Prefabricated Timber Bridge

1

Bridge

75000

75000

0.1

82,500

 

 

 

 

149038

0.1

163,941