Economical Bridges

JANUARY 30, 2010IOWA BICYCLE SUMMIT

Brian P. Keierleber P.E.ECONOMICAL BRIDGE CONSTRUCTION

Bridges in Iowa• Iowa is 5th in Bridges and 30th in population• Bowstring Arch 1872 moved 1891

Buchanan County Iowa

• 257 Bridges over 20’• 9 Pinn-connected

Trusses constructed 1870-1914

• 3 Riveted Trusses• Henry Ford started

mass production of the Model T in 1913

New Construction Costs

• Receives about $283,000/Yr. for BRS/BROS

• 30x100 slab x $105/sf. or $315,000

Our Old Bridges

• We must Have An Economical Alternative or We will Have 250 year old bridges.

RECYCLING CAN BE AN OPTION

We have constructed 15 Bridges from Railroad Flatcars

What Do They Look Like?

Types of Cars

• Pulp Cars

• Military

• 89’ Flatcars, Cost $16,250 Delivered

• 89’ Flatcar cut to 68’, Cost $12,000 Delivered

• Total Costs range between $62,000 and $75,000

Flatcars Not Boxcars

Pulp Cars

Sheet Piling Placed With a Vibratory Plate

Expansion Joint

Stub Abutment With Sheet Piling

Tying The Cars Together

• 1) Bolted Directly

• 2) Bolted With Concrete and # 11 Bars

• 3) Welded

Concrete Beam and Bolts

Bolted Directly

Welded

Types of Decks

• Asphalt Millings

• Rock

• Asphalt Slurry

Asphalt Millings

Asphalt

Tie Down Holes

Patch Holes in The Decks

• 1) Non-Woven Geotextile Fabric

• 2) Asphalt Treated Geotextile (petrotac)

• 3) Rubber Conveyor Belting

Why Do They Retire the Railcars

• Newer lighter More efficient Cars Exist

• Tax Purposes

• Derailments

• Age Limit-Not to Exceed 40 Years

Hazleton Subdivision on Kentucky Ave

89 Ft. FlatcarAround the Mountain Bridge

68 Ft Railcar270 st Franck’s Bridge

Bovenmeyer’s Bridge

Eddy’s Bridge

DELIVERING THE CARS

Placement of Novak’s West Bridge

Equipment Requirements depend on the site

Financing

Economical Bridges

Technology

Transcript of Economical Bridges