Underground Construction - December 2020 - 26
Delivering Clean Water to Canadian First Nation Communities
through the bore path, lapping and spinning
to increase the holes from 12 inches to 24
inches. Throughout the bores, the crews
used a Digital Control DigiTrak Falcon F5
locating system to track their progress.
" Every time we needed to make a tool
change, we had to do it on the lake. On the
first bore, we rented a barge with a big crane
and used that to help us push out additional
rods, giving us more flexibility. Then we
would go down, chain on the end of the pipe
and crane it out. As the person on the drill
would push up more rod from shore, the
crane would give us more leverage and allow
the pipe to come up easier, " said Staal.
" Then, we would get the pipe up on the
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edge of the barge - still connected to the
drill - ratchet it all down on the deck of
the barge, then lower the drill-head reamer
down into the lake and pull it back, "
Staal added. " It was a bit of a process,
so on the second one, instead of using
the barge, we used divers. "
Facing challenging conditions
One challenge encountered during the
bores was the ground conditions changing
unexpectedly on the lakebed.
" It was supposed to be all bedrock, " said
Staal. " The problem was that about 200
feet out on the beach shore, there was a
section that went from rock to native soil
- and then went back into rock. Using that
much pressure there and trying to hammer
through, and then abruptly finding out
that it's not all rock, was really surprising.
We were probably at a depth of 20 feet
when we hit the dirt pocket. "
To alleviate the situation, his crews used
fluted reamers with clay cutters on the end
10:40:27 AM
of their drilling rig to clean out the drill hole.
Staal estimated they bored out around
60 feet from shore and emerged in about
10 feet of water. Since the crews were
going through differing ground conditions,
their drilling averages varied widely.
" Sometimes we were able to go
10 feet, which is one rod, in about 35 to
40 minutes, " he said. " Other times, it
would take 90 minutes or more to do
the same amount of work. "
Staal noted that it can be stressful,
but being patient is the best way to work
through these types of challenges.
" You have to just be persistent and take
your time, " he added. " I mean, we just
let the air and the bit do the work, which
meant that sometimes we were sitting
there on the drill and going slowly. That is
the best way to get the job done right. "
Connecting to the other side
According to Staal, at the same time his
crew was doing the HDD work on the
Kenora side, another contractor was
doing all the sewer and water lines on the
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Underground Construction - December 2020
Table of Contents for the Digital Edition of Underground Construction - December 2020
Contents
Underground Construction - December 2020 - Cover1
Underground Construction - December 2020 - Cover2
Underground Construction - December 2020 - Contents
Underground Construction - December 2020 - 4
Underground Construction - December 2020 - 5
Underground Construction - December 2020 - 6
Underground Construction - December 2020 - 7
Underground Construction - December 2020 - 8
Underground Construction - December 2020 - 9
Underground Construction - December 2020 - 10
Underground Construction - December 2020 - 11
Underground Construction - December 2020 - 12
Underground Construction - December 2020 - 13
Underground Construction - December 2020 - 14
Underground Construction - December 2020 - 15
Underground Construction - December 2020 - 16
Underground Construction - December 2020 - 17
Underground Construction - December 2020 - 18
Underground Construction - December 2020 - 19
Underground Construction - December 2020 - 20
Underground Construction - December 2020 - 21
Underground Construction - December 2020 - 22
Underground Construction - December 2020 - 23
Underground Construction - December 2020 - 24
Underground Construction - December 2020 - 25
Underground Construction - December 2020 - 26
Underground Construction - December 2020 - 27
Underground Construction - December 2020 - 28
Underground Construction - December 2020 - 29
Underground Construction - December 2020 - 30
Underground Construction - December 2020 - 31
Underground Construction - December 2020 - 32
Underground Construction - December 2020 - 33
Underground Construction - December 2020 - 34
Underground Construction - December 2020 - 35
Underground Construction - December 2020 - 36
Underground Construction - December 2020 - 37
Underground Construction - December 2020 - 38
Underground Construction - December 2020 - 39
Underground Construction - December 2020 - 40
Underground Construction - December 2020 - 41
Underground Construction - December 2020 - 42
Underground Construction - December 2020 - 43
Underground Construction - December 2020 - 44
Underground Construction - December 2020 - 45
Underground Construction - December 2020 - 46
Underground Construction - December 2020 - 47
Underground Construction - December 2020 - 48
Underground Construction - December 2020 - 49
Underground Construction - December 2020 - 50
Underground Construction - December 2020 - Cover3
Underground Construction - December 2020 - Cover4
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