Timber Bridge Presentation

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Published on January 1, 2008

Author: Techy_Guy

Source: authorstream.com

Wooden Bridges for Today:  Wooden Bridges for Today New Hampshire’s Transportation Heritage:  New Hampshire’s Transportation Heritage Swift River Bridge, Albany, NH Recently refurbished by NH Department of Transportation New Hampshire’s Transportation Heritage:  New Hampshire’s Transportation Heritage Newport, NH Railroad Bridge (Carol Harootian, photo) NH Bridges in Trouble:  NH Bridges in Trouble Concrete deteriorates Steel rusts NH Bridges in Trouble:  10 years ago over 50% of the bridges in NH were listed as being structurally deficient, functionally obsolete, or red listed. * State of New Hampshire Ten Year Transportation Improvement Program for 2001-2010, August 1999 NH Bridges in Trouble NH Bridges in Trouble:  Of 1,959 state owned bridges, 311 red listed or structurally deficient or obsolete. Of 1,556 non-state owned bridges, 653 either red listed or structurally deficient or obsolete. * State of New Hampshire Ten Year Transportation Improvement Program for 2001-2010, August 1999 NH Bridges in Trouble The Usual Route :  The Usual Route Typical reinforced concrete and steel bridge in need of total replacement A Road Less Traveled :  A Road Less Traveled New Boston, NH Lyndeborough Road Completed August 2000 Installed by New Boston Highway Crew A Road Less Traveled :  A Road Less Traveled Completed 1993 New Boston, NH Depot Street Near Town Center A Road Less Traveled :  A Road Less Traveled Designed and constructed by Arnold M. Graton Associates, Inc. Newport, NH Corbin Bridge, 1994 A Road Less Traveled :  A Road Less Traveled Plymouth, NH Smith Bridge Strongest covered bridge in the world 176-foot span Under construction, 2001 Designed and constructed by Stan Graton II, 3-G Construction, Ashland, NH A Road Less Traveled :  A Road Less Traveled Plymouth, NH: Smith Bridge 250,000 board feet of timber First covered bridge using glue lamination technology Timbers supplied by Unadilla Laminated Products, NY A Road Less Traveled :  A Road Less Traveled Gilford, NH Tannery Hill Bridge Pedestrian bridge Built in early 1990’s by a volunteer crew New Technology Helps a Traditional Material :  New Technology Helps a Traditional Material Types of Bridges: Glue lamination Nail lamination or doweled Stress lamination New Technology Helps a Traditional Material :  New Technology Helps a Traditional Material EPA-approved Preservation & Protection Options Creosote Pentachlorophenal Copper naphthenate Chromated copper arsenate Glue Laminated Bridge:  Glue Laminated Bridge 1990 –Glu-laminated bridge in New Hampton, NH. Bridge from Laminated Concepts, Elmira, NY. Glue Laminated Bridge:  Glue Laminated Bridge New Boston Lyndeborough Road Bridge, August 2000 Modern Glu-laminated bridge by Laminated Concepts, Inc. Nail Laminated Bridge:  Nail Laminated Bridge Jefferson Notch Road, 1990 Wheeler Bridge Company Nail Laminated Bridge:  Nail Laminated Bridge Bartlett, NH 1990 Agent for town was Bergeron Engineering, North Conway, NH Stress Laminated Bridge:  Stress Laminated Bridge Chichester, NH 1990 Constructed of southern yellow pine. Treated with Pentachlorophenal. Stress Laminated Bridge:  Stress Laminated Bridge Chichester, NH, 1990 Constructed of southern yellow pine. Treated with Pentachlorophenal Stressing rods compress individual planks together with pressure Stress Laminated Bridge:  Stress Laminated Bridge North Weare, NH 1991 Constructed with local wood material Designed and constructed by Kent Ruesswick of Canterbury, NH Other Wooden Transportation Structures:  Other Wooden Transportation Structures Timber bin retaining wall, Campton, NH Bin wall system is also suitable for bridge abutments Constructed with eastern hemlock, commercially treated with chromated copper arsenate Slide24:  Why wooden bridges? The public demands a safe and efficient transportation system Traffic increases through ‘80’s and ‘90’s Engineers and community leaders must find new ways to upgrade bridges with fewer resources Slide25:  Why wooden bridges? Hundreds of bridges in NH need replacing Aesthetics & appearance Ease of construction Slide26:  Why wooden bridges? Performance When properly treated Cost Cost competitive, especially when life cycle and maintenance costs are included. Slide27:  Why wooden bridges? Maintenance Long life cycle with fewer maintenance requirements Not susceptible to salt corrosion Potential new markets for NH wood Potential new secondary manufacturing industry for NH Slide28:  Why wooden bridges? Why not?

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