Underground Construction - August 2022 - 16

Auger Boring
indicator can also be used in conjunction
with the water level indicator. "
The water line is checked through
the casing opening using two LED lights
mounted inside the steerable head.
Course corrections are made from the
control station by hydraulically extending
or retracting the steerable head's flaps.
To steer up, the operator needs to
open the flap on the bottom. He or she
can steer down by extending the top flap,
steer to the right by extending the left
side flap, and steer to the left by opening
the right flap. There is no need to pull augers
to make course corrections. All adjustments
can be made in real-time while
installing the finished casing.
Once the bore is completed, the steerable
head is removed on the exit pit side,
and a clean-out bit is attached to the end
of the auger string to remove any debris
from the inside of the casing.
Gasmovic said control stations of the
OTS system are equipped with a 50-gallon
water tank and a 6,500 psi hydraulic
pump. The system is effective in dirt, clay,
sand, shale and rock less than 8,000 psi,
and varying conditions mixed with cobble.
Akkerman
Guided auger boring is probably the most
popular trenchless method of construction,
said Jason Holden, vice president and
chief revenue officer for Akkerman. Technology
for exact line and grade trenchless
installations is gaining more acceptance
in the trenchless community. There are
many new innovations with guided boring
technology that allow longer distances,
more geotechnical conditions, and broader
range of installation techniques.
" There are several situations that are
conducive to guided auger boring, " he
said. " I know of several contractors that
utilize guided auger boring on every auger
16 AUGUST 2022 | UCONonline.com
bore situation, whether it requires it or
not. Pilot tube guides provide pin-point
accuracy, which allows a smaller casing to
be used since it will be on-line and grade,
and there are other useful benefits. "
For example, he said auger boring projects
generally do not have extensive geotechnical
investigations, as they are quite
costly. The installation of a pilot tube will
not only give a contractor an indication of
the ground type on the project, but will
also provide a definitive answer, if there is
an obstruction along the alignment.
Since the pilot tubes can be removed
and the ground will go back to the native
state, the position of the obstruction can
be identified and mitigated before it is
too late.
" Our GBM guidance system, " continued
Holden, " utilizes a theodolite
and LED target type system. It requires a
line-of-sight from the launch shaft all the
way to the steering head, where an LED
target is located. In common terms, the
guidance system acts much like common
surveying technology.
" A powerful camera with remote controls
is used to communicate with proprietary
software that allows the operator to
view the position of the steering head. "
Alternative systems, such as sonde
locators, he added, are also an option
for some projects that do not require
exact line and grade. These systems can
be used in conjunction with the standard
GBM guidance systems.
Holden said the installation of pilot
tubes is intended for straight line installs.
" The maximum degree of directional
change is dependent upon the allowable
accuracy on the project, " he explained.
" The overall accuracy of the installation
will be dependent upon the accuracy of
the equipment set-up, which is highly dependent
on the initial site survey. "
Akkerman Model 240A GBM, Holden
said, can be used with any manufacturer's
auger boring system. It is a universal
base frame that offers adjustability for
various rail widths and centerline heights.
" We have found that this base accommodates
most ABM from 36 to 72 inches.
Akkerman also offers a stand-alone power
pack to operate the GBM system so the
contractor can utilize one GBM system
with multiple ABM systems in the fleet. "
Often referred to as " leap-frogging, "
contractors will install pilot tubes on one
project and then move the GBM system
to another site to work ahead while their
ABM installs casing on the initial site.
Technology advances
Holden said as technology advances, so
do guidance systems.
" We always keep up with the latest
technology advancements on our guided
boring systems, " he said. " We also strive
to allow legacy systems to be easily updated
to current levels so customers can
operate at peak performance. "
Akkerman offers various package
upgrades for specific projects requiring
advanced data logging and smart LED
targets with temperature sensing.
" Michael Byrne Manufacturing has
worked with Akkerman to produce a line
of auger boring machines that are hydraulically
ready to operate an Akkerman
240A GBM system, " Holden said.
" These units can directly couple their
Akkerman 240A GBM system to a MBM
auger boring machine to perform at optimal
levels for an additional external
power pack. "
Holden added that an additional system,
such as high-pressure lubrication,
and advanced pilot-tube-to-casing connections
such as the GRS-50 swivel and
RBU series, are growing the market.
Guided pneumatic hammer technology
is being used more frequently and will
be an emerging trend as more options
become available, he pointed out.
American Augers
American Augers Product Manager
Richard Levings said guided auger boring
projects are increasing and there are
multiple reasons.
" On-line-and-grade
installations,
precise tie-in points, presence of critical
utilities and structures, easement restrictions,
and project owner requirements
are among the reasons, " Levings said. UC
FOR MORE INFORMATION:
Vermeer MV Solutions (McLaughlin),
(864) 277-5870,
mclaughlinunderground.com
Akkerman Inc., (800) 533-0386,
akkerman.com
American Augers, (800) 324-4930,
americanaugers.com
http://www.mclaughlinunderground.com http://www.akkerman.com http://www.americanaugers.com http://www.UCONonline.com

Underground Construction - August 2022

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Underground Construction - August 2022 - Cover1
Underground Construction - August 2022 - Cover2
Underground Construction - August 2022 - 3
Underground Construction - August 2022 - 4
Underground Construction - August 2022 - 5
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