13. 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
15. 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
16. 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.
18. 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.
19. 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.
20. To stay within the crane capacity
the upper lid and side sill plates
were erected separately.
22. Corner piles and timber wingwalls
were installed to support the
approach roadway embankment.
Phase two traffic control
shifted traffic to the outside
while construction activities
were repeated on the inside.
25. The last of the four shoring boxes
being set adjacent to traffic.
Inside
excavation.
26. Pile Driving Preparation
After the shoring
boxes were
installed, pile layout
and geometry
control checks were
made prior to pile
driving.
27. 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.
28. After the piles were
installed the abutment cap
seat was constructed.
30. The BT-63 inch precast prestressed concrete
bulb-tee girders were erected adjacent to
the new bridge location on the falsework.
31. 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.
32. Owner & Project
Designer: Alabama
Department of
Transportation
Contractor: McInnis
Construction
Construction Engineer:
Thompson Engineering
