Underground Construction - September 2021 - 33
When crew members got to within
12 feet of the active railway tracks, they
switched guidance techniques from the
TK system's walkover mode to its DrillTo
mode. In spite of the distance to the
receiver, the driller easily tracked bore progression
to the target on his Commander
7 display. The setup had a continuously reliable
signal with the bore 14 feet beneath
the rails, progressing at about two feet a
minute for each rod.
The final peak of the bore path topped
out about 150 feet away from run completion.
The trick here would be steering the
bore precisely enough to avoid the fiber
optic line running alongside the bore path
and the abandoned gas tanks on the other
side of the lot.
It took two hours to locate the fiber-optic
line. The crews finally had success after
running out an additional 50 feet of fish
tape and grounding the transmitter to
the air conditioner ground of a nearby
business. They first detected the signal by
running the unit at 13,000 Ohms. Setting
the power to level 5 and using 8.01 kHz
enabled them to get down to reliable
reception at 5,000 Ohms.
Despite being satisfied with their utility
locator's settings, the crews did not believe
the reading it was giving them. They knew
the fiber as marked was mislocated, but
readings were showing it at just one foot,
one inch below the concrete.
Atlas called in a ground penetrating
radar (GPR) contractor to ascertain the
fiber-optic line's true location, only to learn
the crews' readings had been almost dead
on. The GPR showed it to lie exactly where
they determined, but slightly deeper at one
foot, nine inches.
Despite Atlas Group's excellent performance
record, the Woody brothers
agreed they still come away from every job
knowing something more.
" The best advice we have to give is why
not use all your resources on hard jobs? "
KJ said. " Everyone gains from each locating
experience. Maybe it's not something we
use on the next job, but it adds to our
expertise. " *
FOR MORE INFORMATION:
Atlas Group, (304) 460-7300,
atlasgroupservices.com
Subsite Electronics, (800) 846-2713, subsite.com
Ditch Witch, (800) 654-6481, ditchwitch.com
UCONonline.com | SEPTEMBER 2021
33
http://www.atlasgroupservices.com
http://www.subsite.com
http://www.ditchwitch.com
Underground Construction - September 2021
Table of Contents for the Digital Edition of Underground Construction - September 2021
Contents
Underground Construction - September 2021 - Cover1
Underground Construction - September 2021 - Cover2
Underground Construction - September 2021 - Contents
Underground Construction - September 2021 - 4
Underground Construction - September 2021 - 5
Underground Construction - September 2021 - 6
Underground Construction - September 2021 - 7
Underground Construction - September 2021 - 8
Underground Construction - September 2021 - 9
Underground Construction - September 2021 - 10
Underground Construction - September 2021 - 11
Underground Construction - September 2021 - 12
Underground Construction - September 2021 - 13
Underground Construction - September 2021 - 14
Underground Construction - September 2021 - 15
Underground Construction - September 2021 - 16
Underground Construction - September 2021 - 17
Underground Construction - September 2021 - 18
Underground Construction - September 2021 - 19
Underground Construction - September 2021 - 20
Underground Construction - September 2021 - 21
Underground Construction - September 2021 - 22
Underground Construction - September 2021 - 23
Underground Construction - September 2021 - 24
Underground Construction - September 2021 - 25
Underground Construction - September 2021 - 26
Underground Construction - September 2021 - 27
Underground Construction - September 2021 - 28
Underground Construction - September 2021 - 29
Underground Construction - September 2021 - 30
Underground Construction - September 2021 - 31
Underground Construction - September 2021 - 32
Underground Construction - September 2021 - 33
Underground Construction - September 2021 - 34
Underground Construction - September 2021 - 35
Underground Construction - September 2021 - 36
Underground Construction - September 2021 - 37
Underground Construction - September 2021 - 38
Underground Construction - September 2021 - 39
Underground Construction - September 2021 - 40
Underground Construction - September 2021 - 41
Underground Construction - September 2021 - 42
Underground Construction - September 2021 - 43
Underground Construction - September 2021 - 44
Underground Construction - September 2021 - 45
Underground Construction - September 2021 - 46
Underground Construction - September 2021 - 47
Underground Construction - September 2021 - 48
Underground Construction - September 2021 - 49
Underground Construction - September 2021 - 50
Underground Construction - September 2021 - Cover3
Underground Construction - September 2021 - Cover4
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