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Accelerated Bridge Construction Bunker Creek Bridge, Durham NH PowerPoint Presentation
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Accelerated Bridge Construction Bunker Creek Bridge, Durham NH. Bunker Creek. NEXT D Beams. Columns. Drilled Shaft 1 ft outside of current roadway. Cast in place with early high strength concrete.

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Accelerated Bridge Construction

Bunker Creek Bridge, Durham NH

Bunker Creek

NEXT D Beams

Columns

  • Drilled Shaft 1 ft outside of current roadway.
  • Cast in place with early high strength concrete.
  • Shaft will need to extend to +40’ in order to create a moment connection to bedrock. Surrounding soil is clay/silt mixture.
  • 4- 10’ wide NEXT 32 D beams will be used. Due to Flange width, no additional concrete is needed for deck.
  • Beams will be prestressed, precast off site.

Oyster River

  • Background:
  • Originally built in the 1930’s
  • Various repairs through the year
  • Substructure mostly original
  • Considerations:
  • High Traffic Volume/Truck Route
  • Long Detour
  • Environmentally Sensitive Area

Project Concepts

Use ABC methods to complete project as quickly and efficiently as possible using mostly precast/prestressed concrete members

Pilecaps

  • Precast offsite
  • Current NH truck limit for 8 or more axles is 150 kips without special permits.
  • Design without cutout was 176 kips, but with cutouts is 148 kips (using 7 ksi concrete)

Durham

NEXT 32D

RT 4

Portsmouth

Shear connections between the four NEXT 32 D beams will be accomplished with a Tongue and Groove Shear Key that is sealed with a polymer.

CROSS SECTION

Post tensioning will be done using DYWDAG bars. Due to 2% hunch needed in roadway, a coupler will be cut/welded to match the slope. Computer modeling foresees negligible stresses across the center from the hunch, however laboratory tests still need to be accomplished.

  • Initial Site Work - minimal daily lane closures
  • Site Preparation
  • Column Installation
  • Bridge Replacement – Full Road Closure
  • 5 to 14 days
  • Remove current bridge
  • Install new bridge
  • Post Site Work- minimal daily lane closures
  • Stone Wall Installation
  • Shoulder Widening on roadway

SIDE VIEW

Roadway Widening

  • Granite blocks stacked vertically and tied into bank in order to create a steeper slope that remains within current bank width.
  • Area will be filled in using geotextiles.
  • After compaction, a wider shoulder can be added and guard rails moved outwards.

Carbon Fiber-Reinforced Polymer (CFRP) grid will be used on top and bottom of flange in place of traditional Temperature and Shrinkage Steel.

By: Elizabeth Kinney

Advisor: Dr. Charles Goodspeed