fredericksburg road at medical drive slide – in – bridge ... · damage from plate studs cast...
TRANSCRIPT
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Lonnie V. Ragsdale, P. E., TxDOT David Griffin, Proj. Mgr, Texas Sterling Constr Co.
SLIDE-IN-BRIDGE FREDERICKSBURG ROAD AT MEDICAL DRIVE, SAN ANTONIO, TX
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Constraints:
Medical Drive could not be closed. Had to have minimum one lane open in each direction at all times for emergency vehicle access to medical facilities.
Milestone 1: Fredericksburg Road could only be closed for 14 days maximum to install bridge.
Milestone 2: Project to be completed in 400 work days (6-day work week).
ADT: Fred. Rd (2008) = 43,900
Med. Dr. (2012) = 18,200
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STATS:
First bridge slide in Texas. Each half of the bridge was slid 184 ft – 9 in Longest slide in U. S.*
Each half of the bridge weighed 2,043,000 lbs Heaviest slide in U. S.*
* For the slide method employed.
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Setting first beam
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2nd Box Beam – Two Crane Pick
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First crane swiveled while other walked
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Swinging beam around for placement
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Ready to lower into place
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Beam set in place
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Looking East
All Beams in Place
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Deck steel in place
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Beginning of Deck Placement
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Deck Concrete Placement
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Second (Larger) Pump Ready
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Teflon pads in place under slide shoes – two each slide shoes on each abutment for each bridge half.
Slide Slab and Bridge Abut
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Pad made of neoprene with a Teflon surface fused to it. Shoe is armored with a stainless steel plate cast into the concrete
Close up of Slide Shoe and Teflon Pad
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Lubricant (Dawn) applied to further reduce friction and prevent damage to the pads.
Applying the “Special” Lubricant
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Needed to ensure uniform pressure to the jacks during lifting and sliding operations.
Central Pump used for the Hydraulic Jacks
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100 ton jacks used to slide each bridge half – one on each abutment
Hooking up horizontal jacks for 1st half
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Cleaning hydraulic ports with brake cleaner to ensure no contaminants
Close up of sliding jack
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Anchor block provides resistance as jack pushes / pulls on the dywidag bar
Close up of downstream anchor block and dywidag bar
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Damage from plate studs cast into shoe.
Slide Shoe after Slide
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Dozer used to ensure bridge half didn’t slide laterally and stayed on center of the slide slab
Small dozer used during slide
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Looking eastward. West anchor block in foreground.
Slide Operations Complete
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Fredericksburg Road at Medical Drive
Slide – In – Bridge Project