Sioux Narrows Bridge Context Sensitive Replacement of a Heritage Timber Truss Bridge

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Sioux Narrows Bridge --Context Sensitive
Replacement of a Heritage Timber Truss Bridge
Raymond Krisciunas P. Eng. Ontario Ministry
of Transportation Reno Radolli MASc., P. Eng.
McCormick Rankin Corporation
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Sioux Narrows Bridge --Context Sensitive
Replacement of a Heritage Timber Truss Bridge
Original Bridge was constructed in 1936 Old
growth Douglas Fir Creosote Treated
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Sioux Narrows Bridge --Context Sensitive
Replacement of a Heritage Timber Truss Bridge
Bridge was synonymous with the Community of Sioux
Narrows Clear span of 210 feet -- one of longest
such bridges anywhere
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Sioux Narrows Bridge --Context Sensitive
Replacement of a Heritage Timber Truss Bridge
Closed a gap between Kenora and Fort Frances
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Sioux Narrows Bridge --Context Sensitive
Replacement of a Heritage Timber Truss Bridge
Summer 2002
450mm
Routine flypast in 2002 discovered shocking
distortion
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Sioux Narrows Bridge --Context Sensitive
Replacement of a Heritage Timber Truss Bridge
Main Chords 760mm x 480mm
Truss Details Laminated members steel thrust
blocks
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Sioux Narrows Bridge --Context Sensitive
Replacement of a Heritage Timber Truss Bridge
Considerable local distress
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Sioux Narrows Bridge --Context Sensitive
Replacement of a Heritage Timber Truss Bridge
Extensive Decay Evidence of compression
failure Rehabilitation not feasible
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Sioux Narrows Bridge --Context Sensitive
Replacement of a Heritage Timber Truss Bridge
Fall 2003
Problem discovered in June 2003 major detour
bridge constructed Oct- Dec 2003
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Sioux Narrows Bridge --Context Sensitive
Replacement of a Heritage Timber Truss Bridge
Bridge Replacement Planning
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Sioux Narrows Bridge --Context Sensitive
Replacement of a Heritage Timber Truss Bridge
9 options considered
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Sioux Narrows Bridge --Context Sensitive
Replacement of a Heritage Timber Truss Bridge
11 (9) Initial Options Evaluated
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Sioux Narrows Bridge --Context Sensitive
Replacement of a Heritage Timber Truss Bridge
3 Final Options
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Sioux Narrows Bridge --Context Sensitive
Replacement of a Heritage Timber Truss Bridge
Summer 2004 Selected Option Existing Trusses on
Steel Girders Salvage existing timber Trusses
not self supporting Timber cladding on steel
skeleton
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Sioux Narrows Bridge --Context Sensitive
Replacement of a Heritage Timber Truss Bridge
Winter 2004 Issues -Navigation
-Environment -Water levels
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Sioux Narrows Bridge --Context Sensitive
Replacement of a Heritage Timber Truss Bridge
Tagged inventoried timber
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Sioux Narrows Bridge --Context Sensitive
Replacement of a Heritage Timber Truss Bridge
65 re-used wood 35 new PSL timber CuNa
treated Galvanized skeleton truss
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Sioux Narrows Bridge --Context Sensitive
Replacement of a Heritage Timber Truss Bridge
Extensive hidden defects
Summer 2006
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Sioux Narrows Bridge --Context Sensitive
Replacement of a Heritage Timber Truss Bridge

• Summer 2006
• Sympathetic Pier
• Archaeological site

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Sioux Narrows Bridge --Context Sensitive
Replacement of a Heritage Timber Truss Bridge
Summer 2006
Steel girder erection
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Sioux Narrows Bridge --Context Sensitive
Replacement of a Heritage Timber Truss Bridge
Summer 2007
Galvanized steel skeleton
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Sioux Narrows Bridge --Context Sensitive
Replacement of a Heritage Timber Truss Bridge
Cladding combined PSL and reclaimed timber
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Sioux Narrows Bridge --Context Sensitive
Replacement of a Heritage Timber Truss Bridge
Selective re-use of original wood
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Sioux Narrows Bridge --Context Sensitive
Replacement of a Heritage Timber Truss Bridge
The old and the new
New PSL
Old DFir
Reclaimed Hangers
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Sioux Narrows Bridge --Context Sensitive
Replacement of a Heritage Timber Truss Bridge
Wood clad support brackets
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Sioux Narrows Bridge --Context Sensitive
Replacement of a Heritage Timber Truss Bridge
Combined Use of Reclaimed wood and PSL
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Sioux Narrows Bridge --Context Sensitive
Replacement of a Heritage Timber Truss Bridge
New
Fall 2007
Original
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Sioux Narrows Bridge --Context Sensitive
Replacement of a Heritage Timber Truss Bridge

• Design McCormick Ranking Corporation
• Constn Admin Cook Engineering
• Construction MLA Northern Contracting
• Bridge Cost 12 Millions
• Heritage Cost 1.5 Millions