DFI Magazine March/April 2020 - 98

4.9 ft) were used. Hollow 40 mm (1.6 in) bars
were drilled 3 m to 4.5 m (9.8 ft to 14.8 ft) to
carry the load of the CMM.
The outer tops of the tubes were encased
with foam to help retain alignment and to
assist with tube isolation from the existing
pad. The loose fill around the Quick tubes
was determined to have successfully helped
isolate the vibrations from nearby machinery
and to have created a no-bond area without
affecting the load capabilities of the micropiles.
Next, the hollow bars were installed
using a top hammer percussion drill to a
depth of 4 m to 6 m (13.1 ft to 19.7 ft). Finish
grout was used to fill the Quick tubes. To
centralize the bars, a metal frame was built
that aligned the bars within the tubes to
permit a proper connection with the feet of
the CMM.
The CMM manufacturer took confirmatory measurements of the installed foundation
and commissioned the machine for service.

Conclusion
In all four machining center foundation
cases presented, the desired results were
achieved by using micropile foundations.
Vertical mill piles with proud workers

vibrations. Given that the full machine
shop operated daily and forklifts routinely
moved materials to and from the factory
machines, this 2018 installation posed
significant challenges.
In part, TEI had to address the lack of
defined foundation requirements from the
manufacturer for this vibration-sensitive
equipment. Vibrations created from nearby
machining centers and passing loaded
forklifts were measured to estimate the
demands on the CMM foundation. A forklift caused the highest vibration readings.
Therefore, the final design was based on the
measured vibrations from the forklift.
From previous experience, TEI engineers determined that embedding the five
micropiles to a depth of 1.5 m (4.9 ft) was
sufficient to isolate this machine from
forklift vibrations. To isolate the machine
from the existing pad as well, a unique
design was used in which the concrete was
first cut, holes were auger drilled, and foam
Quick tubes were installed. Quick tubes
with depths of 215 mm to 1.5 m (1.6 in to
Hexagon Global CMM machine

98 * DEEP FOUNDATIONS * MAR/APR 2020



DFI Magazine March/April 2020

Table of Contents for the Digital Edition of DFI Magazine March/April 2020

Contents
DFI Magazine March/April 2020 - Intro
DFI Magazine March/April 2020 - Cover1
DFI Magazine March/April 2020 - Cover2
DFI Magazine March/April 2020 - Contents
DFI Magazine March/April 2020 - 4
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