Underground Construction - December 2019 - 24
Sliplining with an HDD Twist
stantly for maximum allowable forces and
for changes which would indicate a potential
problem in the tunnel. The rotation of the
drill head also was monitored to help predict
any unwinding behavior of the pipe after the
pull was competed and when the in-place
pipe was allowed to relax. Once the pipe
string was in the exact retrieval location the
pull-head was cut-off and removed. Pullback
pressures remained lower than engineering
estimates, and Garney restrained the pipeline at the tunnel entrance and installed the
barometric loop at the tunnel exit.
To fuse and completely pull the pipe
string through the tunnel took 42 days.
After the pipe was in place, grouting began
by subcontractor Cematrix.
Meadows said low-density cellular
concrete (LDCC) was used to minimize the
risks associated with pipe floatation during
grouting and the high heat of hydration
that would be experienced with traditional
cement grout. The grout had an initial
appearance and consistency of a light foam.
After curing, it hardened and looked more
like pumice. It took about 7,400 cubic
yards of LDCC pumped in from the east
portal through four ventilation shafts and
through nine new grout injection ports.
After grouting, the entry and exit portals
were replaced. The upstream portal building
was replaced with a buried vault structure
which provides plenty of access while eliminating a structure with odor control and
other operational and maintenance concerns. The downstream portal was rebuilt
and refurbished. Both were coated with
wastewater-specific structural cements and
an epoxy topcoat that should provide more
than 50 years of service life without damage
in the highly corrosive environment.
Throughout construction, there was minimal interruption of traffic flow in the area.
"WE WOULDN'T DO THE
JOB IF IT WASN'T GOING
TO BE 100% QUALITY."
Chad Abatie
TRUST
IN A JOB
WELL DONE
UC
T
VIS
IT U
BO SHO
OT W
H4
17
SA
T TH
E
J
IN AN. 28
OR TH
L AN -3
DO, 0TH
F L.
1
DECEMBER 2019 | UConOnline.com
24UndergroundCon.indd
With the most reliable fusion equipment and a
nationwide distribution network ready to support
you with operator training, parts and service, you
can have the confidence to do
your best work and get the job
done right.
Read more about
Chad's experience at
mcelroy.com/uc
© 2019 McElroy Manufacturing, Inc. All Rights Reserved.
11/19/19 9:57 AM
http://www.mcelroy.com/uc
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Underground Construction - December 2019
Table of Contents for the Digital Edition of Underground Construction - December 2019
Contents
Underground Construction - December 2019 - FC
Underground Construction - December 2019 - IFC
Underground Construction - December 2019 - Contents
Underground Construction - December 2019 - 4
Underground Construction - December 2019 - 5
Underground Construction - December 2019 - 6
Underground Construction - December 2019 - 7
Underground Construction - December 2019 - 8
Underground Construction - December 2019 - 9
Underground Construction - December 2019 - 10
Underground Construction - December 2019 - 11
Underground Construction - December 2019 - 12
Underground Construction - December 2019 - 13
Underground Construction - December 2019 - 14
Underground Construction - December 2019 - 15
Underground Construction - December 2019 - 16
Underground Construction - December 2019 - 17
Underground Construction - December 2019 - 18
Underground Construction - December 2019 - 19
Underground Construction - December 2019 - 20
Underground Construction - December 2019 - 21
Underground Construction - December 2019 - 22
Underground Construction - December 2019 - 23
Underground Construction - December 2019 - 24
Underground Construction - December 2019 - 25
Underground Construction - December 2019 - 26
Underground Construction - December 2019 - 27
Underground Construction - December 2019 - 28
Underground Construction - December 2019 - 29
Underground Construction - December 2019 - 30
Underground Construction - December 2019 - 31
Underground Construction - December 2019 - 32
Underground Construction - December 2019 - 33
Underground Construction - December 2019 - 34
Underground Construction - December 2019 - 35
Underground Construction - December 2019 - 36
Underground Construction - December 2019 - 37
Underground Construction - December 2019 - 38
Underground Construction - December 2019 - 39
Underground Construction - December 2019 - 40
Underground Construction - December 2019 - 41
Underground Construction - December 2019 - 42
Underground Construction - December 2019 - 43
Underground Construction - December 2019 - 44
Underground Construction - December 2019 - 45
Underground Construction - December 2019 - 46
Underground Construction - December 2019 - 47
Underground Construction - December 2019 - 48
Underground Construction - December 2019 - 49
Underground Construction - December 2019 - 50
Underground Construction - December 2019 - 51
Underground Construction - December 2019 - 52
Underground Construction - December 2019 - 53
Underground Construction - December 2019 - 54
Underground Construction - December 2019 - 55
Underground Construction - December 2019 - 56
Underground Construction - December 2019 - 57
Underground Construction - December 2019 - 58
Underground Construction - December 2019 - IBC
Underground Construction - December 2019 - BC
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