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ABC in Alabama_2015 National ABC Conference Presentation
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Transcript of ABC in Alabama_2015 National ABC Conference Presentation
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ACCELERATED BRIDGE CONSTRUCTION
Ross Clark Circle Bridge Slide
Dothan, Alabama
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231 431
231
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Ross Clark Circle (west side)
� US 231
� Built in 1950s
� Divided Four Lane
� Average Daily Traffico design – 5,000 o current > 40,000o 20 year ≈ 73,000
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Beaver Creek Culvert
� 3 BBL 10’(↔) x 6’ (↨)
� 155 ft long
� 20’ fill
� Structurally Deficient(severely cracked)
� Opening has immersed
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UTILITIES WATER
SEWER
OVERHEAD
ELECTRIC
TELEPHONE /
CABLE
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Exit End
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Entry End
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Contractor provides
engineered design
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Temporary Shoring Boxes and Falsework
Temporary Shoring Boxes
Used to construct the
permanent bridge
abutment piles and cap
seats
Temporary Falsework
Used to construct the new bridge
superstructure adjacent to the
permanent structure location and
for support during the bridge slide
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Temporary Falsework
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Temporary Shoring Boxes
� Cost effective
� Used material that was
readily available to McInnis
Construction
� Could be installed quickly at
the project site
� Could be de-constructed
� Could be re-used on future
projects
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In order to ensure
proper geometry
controls and check
constructability, McInnis
Construction set up a
pre-fabrication site at
their home office to
verify the temporary
shoring box geometry
and fit-up, pick weights
and crane reach
requirements,
fabrication steps,
transportation
requirements, and de-
construction sequence
Pre-Fabrication Site
Thompson Engineering coordinated the AASHTO
LRFD design of the temporary shoring box with
McInnis Construction in order to optimize
construction means & methods.
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Lay-Down Area
Construction activities
continued concurrently as
the shoring boxes were built
in the Lay-Down area.
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A two phase traffic control was used to maintain traffic during excavation and installation of the shoring boxes. The first phase shifted traffic to the inside with excavation on the outside.
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A plan note required existing traffic to be maintained during peak hours, therefore McInnis Construction installed the shoring boxes during the weekend including nighttime work to minimize impacts to traffic.
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To stay within the crane capacity the upper lid and side sill plates were erected separately.
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Backfilling and approach roadway asphalt being completed.
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Corner piles and timber wingwallswere installed to support the approach roadway embankment.
Phase two traffic control shifted traffic to the outside while construction activities were repeated on the inside.
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Excavation continued on the inside while traffic was maintained on the outside.
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Shoring boxes being erected and set in the trench.
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The last of the four shoring boxes being set adjacent to traffic.
Inside excavation.
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Pile Driving Preparation
After the shoring boxes were installed, pile layout and geometry control checks were made prior to pile driving.
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A similar inside/outside traffic control was used to drive the piles after the upper lids of the shoring boxes were removed. Additional falsework piles were driven on the outside.
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After the piles were installed the abutment cap seat was constructed.
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Temporary Falsework
Temporary falsework was installed adjacent to the new bridge location to support the new superstructure in preparation for the bridge slide.
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The BT-63 inch precast prestressed concrete bulb-tee girders were erected adjacent to the new bridge location on the falsework.
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� Shoring system needs to be wrapped with plastic or filter blanket to stop intrusion of sand from backfilling around the box.
� Top sill plate on sidewalls needs reinforcement/stiffness for when asphalt is placed adjacent to it. Sill plate deformation caused the top lid to become extremely difficult to lift and place during lane closure construction.
� Shoring system was designed heavy for reusing purposes. However, we need it to be lighter or have a larger crane so we could set a more completed section during lane closure construction.
� Backfilling the shoring boxes after excavation took the longest time. More ways to improve logistics on job site.
� Prefabricating the boxes worked good. Need to improve on the shipping dimensions and time to fabricate on the job site.
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� Owner & Project Designer: Alabama Department of Transportation
� Contractor: McInnis Construction
� Construction Engineer: Thompson Engineering
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