Underground Construction - December 2017 - 16

210-Mile Fiber Optics Project
es to a depth of about 48 inches,
wide buckets so we can reshape
6 inches beyond the standard 42
ditches and restore the right of
inches. The extra depth ensures
way," he said. "You don't want anycompliance and allows smaller
body to know you've been there."
rocks to remain in the trench. "We
RBC added two larger DXplow in the broken rock slot to
300LC-5 crawler excavators to its
place conduit," he said.
fleet specifically for the project.
A vault is installed every 2,500 Sorenson, who was raised in a
feet and serves as an access and
logging community, had noticed
termination point for the filogging crews using the Doosan
ber-optic cable that will be blown
brand of equipment. "Loggers put
into the conduit. In some instanc- everything to task - the terrain
es, the crew can't plow in the con- they work on and the weight they
duit at the vault and has to splice
pull," he said. "If the loggers like
conduit together. The excavators
it and it will hold up for them, it's
use a rock saw, so we're using more
and a DX225LC-3 crawler excavacertainly going to hold up in our
breakers on the Mt. Hood portion
tor are used for digging the hand
industry."
of the job," said Sorenson.
holes.
Each excavator is equipped with
With more than 100 miles of
Ripping through various ground an 8,500-foot pound hydraulic
the project underway or completconditions, breaking rock and
rock breaker for large boulders and ed, Sorenson says snowfall on Mt.
hauling away excess material can
busting up solid rock. The excavaHood will likely shutdown work on
make quite a mess, especially near
tor and breaker combination is the the mountain portion of the job
roadways. Excavators are also used only option for breaking solid rock until spring 2018. In the meanfor backfilling and reshaping ditch- because of the slope of the terrain.
time, RBC will begin construc17-11-20_004_ID17089_eAz_AVN_UndergroundConstruction_178x124_rz
tion from the western side of the
es and general cleanup. "We use
"You have to have level ground to

mountain, eventually completing
the full 210-mile stretch and bringing high-speed connectivity to a
growing industry - with room for
future expansion.
FOR MORE INFORMATION:
Robinson Brothers Construction,
(360) 576-5359, rbc-utility.com
Doosan Equipment,
(877) 613-7970, doosanequipment.com

Trusted
More than 1,000 AVN Machines delivered, worldwide
presence and service. Since
more than 30 years.

Allrounder
Herrenknecht AVN Machines: safe and
robust performance for diameters between 0.4 and 4 meters and distances of
over 1,000 meters. For all ground conditions, high water pressures and curves
with tight radii.

M-1122M, AVND 2000
Portland East Side CSO Project
Contractors:
Kiewit-Bilfinger Berger (KBB) JV

Pioneering Underground Technologies
www.herrenknecht.com

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10:19
Underground Construction20.11.17
December
2017

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Underground Construction - December 2017

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