Bailey Bridge

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Bailey Bridge
By Erick Cain
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What is a Bailey Bridge?

• A Pre-fabricated Truss Bridge designed for the
  military during WWII.

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Who Invented the Bailey Bridge and Why ?

• Sir Donald Bailey
• Civilian Engineer for the Experimental Bridge
  Establishment (EBE) Royal Engineers
• Military needed a strong, light weight, easily
  manufactured bridge during WWII.

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Bailey Bridge Requirements

• Bridge parts could not weigh more then 600 lbs or
  what 6 men could lift.
• All parts had to be able to fit in a 3 ton GS
  Lorry.
• Bridge had to be flexible to carry various size
  loads, and be adaptable to various size gaps.

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Bailey Bridge Requirements

• A 150 foot triple-triple Bailey Bridge had to be
  able to carry a Churchill Tank on its transporter
  (70 tons)

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Why Bailey Bridge Specs are great for
Transportation Departments

• Versatility
• Quick and easy to assemble.
• If needed can be built to carry legal loads.
• Once purchased inexpensive detour.
• Many of the same reasons it worked well for the
  military during WWII.

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Bailey Bridge Drawbacks

• They are a one lane bridge.
• Need continual maintenance.
• Bolt and Nut Tightening
• Transom Clamp Tightening
• Timber Plank Checking.

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Recent Uses of Our Bailey Bridge Parts

• City of Scio, Oregon Summer 2007.
• Port of St. Helens
• Oregon State Parks Pedestrian Bridge.

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Assembly of Scio Bailey Bridge

• First we had to locate enough Bailey Bridge for
  the Scio Detour.
• Oregon National Guard helped us out.

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Preparation is Key

• Preparing the site prior to bridge assembly.
• Ground work for the rollers. (level ground)
• Proper spacing of the rollers.
• Enough personnel to assemble.

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Preparation

• Ensure enough parts have been delivered to site
  to build the desired structure.
• If launching bridge ensure enough parts for
  counter weight, and launching nose.

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Preparation

• Ensure the clamps and bolts are in proper working
  order
• Check for unusable floorboards.
• Ensure all the parts are compatible. MI, MII,
  MIII Bailey Bridge Parts.

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Tools for Bailey Bridge Construction
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Tools for Bailey Bridge Construction
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Tools for Bailey Bridge Construction
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Importance of Soils

• Taking in to consideration of the soil when
  constructing the bridge.

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Building the Launching Nose

• First several panels are a skeleton frame.
• Number of panels depend on the length and size of
  bridge being launched
• Launching frame is separated from the bridge main
  span by the launching link.

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Assembling the Bridge

• Begin to assemble the bridge by standing up truss
  panels on the stationary rollers.
• After truss panels are stood up connect them with
  transoms and transom clamps.

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Assembling the Bridge

• Next connect the panels with panel pins and pin
  clips.

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Assembling the Bridge

• Next attach
• Sway Bracing
• Frame Bracing

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Building the Bridge

• After the launching nose begin building the
  actual bridge.
• Actual Bridge consists of a desired number of
  panels deep and tall up to 3 wide and 3 high.
  (Scio Bridge is a Single Double)

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Building the Bridge

• When building the bridge it is important to keep
  on enough counter weight.

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Building the Bridge

• Stringers are placed into position after the
  assembly each panel and truss section.
• The stringers are the support for the floor
  beams.

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Building the Bridge

• Launching is done by mostly brute force.
• Need as many people as possible on each side of
  the bridge to push.
• Heavy equipment can be utilized to help push and
  pull.

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Adding the Planking

• Riding surface is timber planking.
• Steel Grading is also available, ODOT currently
  does not own any bailey bridge grating.

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Curb

• Installing a curb is a important factor in
  holding floor boards in place.

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Finishing Touches

• Approaches
• Ramps
• Traffic Control

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Detour
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Scio Bridge Final Stats

• 64,000 vehicles End of June 2007 October 2,
  2007
• 5000 Pedestrians and Bicycles
• Open 8 hour day 6 days a week

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Inexpensive Detour

• Total Cost of using Bailey Bridge 110,000
• Linn County estimate over a 1,000,000 if
  standard a standard timber detour bridge was built

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Storage

• Currently Old I-205 Rest Stop
• Store Bailey and Acrow Bridge
• Any Ideas for storage east of the mountains?

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Thank You!