March/April 2024 - 18

Drilling blast holes for tower foundation excavation
Tram Swing Clearance: Carving the Way
Ensuring a minimum of 10 ft (0.9 m) of cabin clearance for the
tram cars throughout the ascent demanded meticulous
planning. More than 3,000 cu yd (2,290 m) of material were
moved through a combination of blasting, manual scaling and
a spider excavator that uses a wench system to lower itself off
the side of the mountain. This machine is capable of working
on near vertical slopes. This meticulous process guaranteed a
safe and smooth journey for passengers, overcoming the
challenges presented by the mountainous terrain.
Conclusion
The tower consisted of three different footings to support
each of its legs. Each footing was supported by six micropiles,
with two tiebacks on the uppermost footing. Mirroring the top
terminal, these micropiles and tiebacks featured 6 in (152
mm) diameter holes with Williams Form 2.25 in (57 mm)
diameter center bars, supporting a design load of 253 kip
(1,125 kN). A total of 300 cu yd (230 m3) of concrete, also
poured by helicopter, anchored the tower securely.
Drilling micropiles for
the station at the peak
The construction of the Lone Peak Tram stands as a triumph
of engineering in extreme environmental conditions and
challenging geotechnical landscapes. This marvel, perched at
the pinnacle of Lone Mountain, not only replaces its
predecessor but also ushers in a new era of technological
excellence in North American skiing. The collaboration of
human ingenuity with cutting-edge technology against the
backdrop of Montana's majestic peaks exemplifies the
relentless pursuit of progress in the field of engineering. The
new Lone Peak Tram saw its grand opening on December 19,
2023, leaving another indelible mark on the North American
skiing industry and showcasing the limitless possibilities of
modern engineering. This project was built out of CondonJohnson
& Associates' new Bozeman, Montana, office.
Excavation completed for three tower foundations
Ty Jahn, P.E., is an area manager for Condon-Johnson & Associates
working out of the Bozeman, Montana, office. Jahn is a Montana
native who specializes in limited access and special topic projects.
Clint Judisch is a project manager for Condon-Johnson &
Associates working out of the Bozeman, Montana, office. Judisch is
originally from Conrad, Montana, and graduated with a degree in
civil engineering from Montana State University. He specializes in
remote helicopter operations.
18 * DEEP FOUNDATIONS * MAR/APR 2024

March/April 2024

Table of Contents for the Digital Edition of March/April 2024

TOC
March/April 2024 - Intro
March/April 2024 - 1
March/April 2024 - 2
March/April 2024 - TOC
March/April 2024 - 4
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