The West Main Street Bridge Rehabilitation

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The West Main Street Bridge Rehabilitation
2
Outline

• History of The West Main Street Bridge
• Overview of The Project
• Why is Rehabilitation Needed?
• Rehabilitation Program

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History of The West Main Street Bridge

• Steel truss bridge crossing over The Old Welland
  Canal Previously a lift bridge, but is now in a
  fixed state.
• Built between 1929-1930.
• Presently the bridge carries two lanes of
  westbound traffic with an average annual daily
  traffic of 10,700 vehicles.

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History of The West Main Street Bridge

• Last rehabilitation of the bridge occurred in
  2005
• Concrete repairs to the bridge deck, abutments
  and piers.
• New concrete sidewalks, approach slabs, steel
  abutment bearings, pier and abutment expansion
  joints.
• Removal of steel splash guards.
• Below deck structural repairs.
• Re-coating of structural steel 1.8 m above the
  roadway.

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Overview of The Current Project

• A full bridge inspection was carried out in the
  fall of 2013 according to current Ontario
  Structure Inspection Manual (OSIM) guidelines.
• The report provided rehabilitation
  recommendations to extend the useful life of the
  bridge, and to
• Re-assed previous inspection reports to refine
  rehabilitation costs.

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Why is Rehabilitation Needed?
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• BRIDGE CONDITION
• Common areas of deterioration include peeling of
  coating, light to moderate corrosion and areas
  section loss
• Areas that not have been re-coated are
  susceptible to deterioration caused by rain, snow
  and salt

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• BRIDGE CONDITION
• Typical areas of section loss where the original
  splash guard was removed
• 100 section loss at some locations

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• BRIDGE CONDITION
• Some areas underneath bridge need re-coating
  since the last project
• Areas of corrosion and section loss are common
• Concrete delamination on bridge concrete piers

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• BRIDGE CONDITION
• 200 mm gap on sidewalk adjacent to structural
  steel
• Damaged structural elements due to impact
• Operator house to be upgraded using a suitable
  cladding system

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Rehabilitation Program

• A 3-coat paint system is recommended.
• Steel repairs are recommended including
• Plate repairs
• Steel angle replacements
• Gusset plate replacements
• Lacing and batten plate replacements
• Architectural repairs to the operator house are
  recommended