| 词条 | Eagle River Timber Bridge |
| 释义 |
|bridge_name= Eagle River Timber Bridge |image= Eagle River Timber Bridge.JPG |image_size= |alt= |caption= |official_name= |other_name= Eagle River Bridge |carries= Automobiles |crosses= Eagle River |locale= Eagle River, Michigan |owner= |maint= |id= 42142021000B050[1] |architect= |designer= |engineering= |design= |material= Wood and steel |length= {{convert|152|ft|m|0}}[2] |width= {{convert|35|ft|m|0}}[1] |height= {{convert|50|ft|m|0}}[2] |mainspan= {{convert|79|ft|m|0}}{{#tag:ref|One arch spans {{convert|74|ft|m|0}}, the other spans {{convert|79|ft|m|0}}.[2]|group=lower-alpha}} |spans= |pierswater= |load= |clearance= |below= |life= |builder= |fabricator= |begin= 1988 |complete= |cost= |open= 1990 |inaugurated= |traffic= 849 (in 2007)[1] |preceded= Lake Shore Drive Bridge |followed= |heritage= |collapsed= |closed= |replaces= |map_cue= |map_image= |map_alt= |map_text= |map_width= |coordinates= {{coord|47.4125|-88.297|region:US-MI_type:landmark|display=inline,title}} |references= |extra= }} The Eagle River Timber Bridge is a wooden arch bridge carrying highway M-26 over the Eagle River in Eagle River, Michigan. It opened in 1990 as a replacement for the historic Lake Shore Drive Bridge that runs parallel to it. HistoryConstruction on the bridge began in 1988.[1][3] The quantity of wood used was equivalent to three or four average-size houses.[2] The bridge opened for highway M-26 traffic in 1990, at which point the neighboring Lake Shore Drive Bridge was restricted to pedestrian use.[4] On August 26, 1992, the bridge was entered into the 1992 Timber Bridge Design and Construction Award Competition.[5] It was awarded first place in the "Long Span Vehicular Bridges" category.[6] DesignThe bridge is primarily constructed of wood joined together with steel connectors. It is supported by two adjacent arches: one spans {{convert|74|ft|m|0}} and the other {{convert|79|ft|m|0}}. Each arch is constructed from two curved sections joined together by a crown hinge. The road deck is made of wood and covered by an asphalt road surface.[2] All the timber members were glue-laminated and pressure treated with preservative pentachlorophenol in oil. Any wooden portions which were cut or drilled also had an application of copper naphthenate. The steel pins in the hinges at the crown and abutments were chrome plated to reduce friction and prevent corrosion. All other steel was hot-dipped galvanized, given a tie-coat, and covered by epoxy and a top coat of brown urethane, a system designed to provide thirty years of protection.[2] Bridge maintenance consists of reapplying preservative to all wooden members and any necessary tightening of bolts.[2] Notes1. ^1 2 3 {{cite web |first= Steve |last= Conro |date= October 9, 2011 |title= Eagle River Bridge |url= http://bridgehunter.com/mi/keweenaw/eagle-river/ |work= BridgeHunter.com: Historic Bridges of the US |accessdate= January 1, 2012}} 2. ^1 2 3 4 5 6 {{cite journal |last= Ness |first= Brian |title= The Eagle River Timber Bridge |journal= Mates |date=June 1991 |issue= 54 |url= http://www.michiganhighways.org/indepth/M-26_timberbridge.html |accessdate= January 1, 2012}} 3. ^{{Cite report |author= Staff |date= October 1, 2011 |title= Highway Bridge Report |url= http://mi.gov/documents/mdot/MDOT_HighwayBridgeReport_July31-10_CountyB_335026_7.pdf |publisher= Michigan Department of Transportation |format= PDF |page= 61 |accessdate= January 1, 2012}} 4. ^{{cite web|author=Staff |title=Lake Shore Drive Bridge |url=http://www.mcgi.state.mi.us/hso/sites/8218.htm |work=State Historic Preservation Office |publisher=Michigan State Housing Development Authority |accessdate=December 31, 2011 |deadurl=yes |archiveurl=https://web.archive.org/web/20120612201757/http://www.mcgi.state.mi.us/hso/sites/8218.htm |archivedate=June 12, 2012 |df= }} 5. ^{{cite journal |last= Bukoski |first= Glenn |title= 1992 Member Bridge Award Competition |journal= Mates |date=November 1992 |issue= 69 |url= http://www.michiganhighways.org/indepth/M-26_timberbridge.html |accessdate= January 1, 2012}} 6. ^{{cite news |title= Timber Bridge Design Awards Announce |url= http://www.woodcenter.org/docs/WIT-14-0015.pdf |accessdate= January 2, 2012 |newspaper= Crossings |agency= Timber Bridge Information Resource Center |page= 2 |format= PDF |date=February 1994 }} References{{Reflist}}Further reading
External links
7 : Road bridges in Michigan|Wooden bridges in Michigan|Open-spandrel deck arch bridges in the United States|Bridges completed in 1990|Transportation in Keweenaw County, Michigan|Buildings and structures in Keweenaw County, Michigan|M-26 (Michigan highway) |
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