January/February 2023 - 16

Adjacent tunnel and loading dock projects
To complete this excavation,
a retention system
needed to be designed to
allow up to a 30 ft (9 m)
deep excavation along the
operating hospital, road
and existing tunnels, and
to allow all vehicle and
pedestrian traffic access
to the Mayo facilities while
handling the geotechnical
and geometric constraints.
much faster than cased excavation. To monitor noise and
vibration that might have an impact on the adjacent Jacobson
building, where doctors perform intensive robotic surgery,
vibration monitors were set up outside and inside of the
building. Crews worked with hospital staff to ensure levels
were not exceeded and all drilling activities were arranged
around the surgery schedule. The predrilling and resonancefree
side grip Movax were able to eliminate vibration impacts
to the project.
The general contractor requested that trumpets were used
wherever possible to limit the waler protrusions into the
excavation. The predrilling information was invaluable to
confirm anchor elevation as adjustments were extremely
difficult because each beam needed to be prefabricated offsite
and then delivered to the project.
The tiebacks were installed with a Comacchio MC15 drill
rig. An injection bored anchor was selected with a larger top
hammer as it allowed for quick installation in the
overburdened soils but could also penetrate the limestone.
Utilizing a larger rig proved to be impractical due to numerous
overhanging utilities and the narrow width of the excavation.
Additional Challenges
The design also had to incorporate egress for both vehicle and
pedestrian traffic adjacent to and over the excavation
requiring multiple bridges to be utilized, access for delivery
and service vehicle traffic, the support of existing utilities,
support of the existing pedestrian tunnels, and underpinning
of the existing structures.
16 * DEEP FOUNDATIONS * JAN/FEB 2023
Numerous utilities were supported during excavation

January/February 2023

Table of Contents for the Digital Edition of January/February 2023

TOC
January/February 2023 - Intro
January/February 2023 - 1
January/February 2023 - 2
January/February 2023 - TOC
January/February 2023 - 4
January/February 2023 - 5
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https://www.nxtbook.com/dfi/DEEP-FOUNDATIONS/november-december-2023
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https://www.nxtbook.com/dfi/DEEP-FOUNDATIONS/january-february-2023
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