Underground Construction - January 2019 - 27
The Direct Pipe method
combines the advantages of
microtunneling and horizontal
directional drilling (HDD). "In
one step, a prefabricated pipeline
can be installed, and the required
borehole excavated at the same
time," said Carlin. "The one-step
process pushes tunneling equipment and pipe with no rotating
equipment above the ground."
The project initially was designed to be executed using HDD.
"However," said Rob Hotz, vice
president of Direct Pipe and Engineering, "there were concerns
with the geometry of the preliminary drill and the location of the
breakthrough of the pipeline into
the Gulf of Mexico. In addition,
the marine support would have
been significantly more challenging, costly and would have taken
longer than Direct Pipe (DP). Because DP is a one-side operation,
there were no offshore support
requirements until the microtunnel boring machine surfaced in
the seafloor."
DP also significantly reduced
the volume of drilling fluid to be
contained offshore compared to
HDD. All pipe could be welded
onshore for the pipeline for the
underground segment, as well
as the additional footage thrust
offshore, to allow a lay barge to
access in deeper water to begin
the offshore lay.
Project planning was also
critical, particularly with regards
to equipment. Laney worked
extensively with Herrenknecht
AG to implement an execution
plan with the correct equipment design. Laney utilized its
custom-built Herrenknecht
HK750PT thruster and clamp
with a Herrenknecht AVN 1000
TBM.
Installation
Project equipment and crews were
staged on an island off the mainland in the Gulf of Mexico located
in Cameron County, Texas.
"This required daily crew
access using a boat from the
mainland. Space for equipment
layout and foundations was not
an issue," Carlin said. "However,
extensive matting was required
for entry set-up and pipe stringing over the marshlands of South
Texas. Laying out of the pipe required four separate drill strings
and three mid-welds during
tunneling."
From its launch pit, soil was
excavated using a slurry-supported Herrenknecht Microtunneling
Machine (AVN). This machine
pumps excavated material
through a slurry circuit inside the
Industry-Leading Transportation & Utility Contractor
Constructing Solutions
*
*
*
*
*
*
*
Cured-in-place pipe
Direct Pipe
Gas Distribution
Horizontal Directional Drilling
Mainline Pipeline
Spray-in-place pipe
Tunneling
Discover our capabilities:
www.michels.us/IndustryLeaders
Raising the bar for individual growth, career potential & meaningful work.
Learn about opportunities at www.michelscareers.us
People | Projects | Values
UConOnline.com | JANUARY 2019
27
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Underground Construction - January 2019
Table of Contents for the Digital Edition of Underground Construction - January 2019
Contents
Underground Construction - January 2019 - FC
Underground Construction - January 2019 - IFC
Underground Construction - January 2019 - Contents
Underground Construction - January 2019 - 2
Underground Construction - January 2019 - 3
Underground Construction - January 2019 - 4
Underground Construction - January 2019 - 5
Underground Construction - January 2019 - 6
Underground Construction - January 2019 - 7
Underground Construction - January 2019 - 8
Underground Construction - January 2019 - 9
Underground Construction - January 2019 - 10
Underground Construction - January 2019 - 11
Underground Construction - January 2019 - 12
Underground Construction - January 2019 - 13
Underground Construction - January 2019 - 14
Underground Construction - January 2019 - 15
Underground Construction - January 2019 - 16
Underground Construction - January 2019 - 17
Underground Construction - January 2019 - 18
Underground Construction - January 2019 - 19
Underground Construction - January 2019 - 20
Underground Construction - January 2019 - 21
Underground Construction - January 2019 - 22
Underground Construction - January 2019 - 23
Underground Construction - January 2019 - 24
Underground Construction - January 2019 - 25
Underground Construction - January 2019 - 26
Underground Construction - January 2019 - 27
Underground Construction - January 2019 - 28
Underground Construction - January 2019 - 29
Underground Construction - January 2019 - 30
Underground Construction - January 2019 - 31
Underground Construction - January 2019 - 32
Underground Construction - January 2019 - 33
Underground Construction - January 2019 - 34
Underground Construction - January 2019 - 35
Underground Construction - January 2019 - 36
Underground Construction - January 2019 - 37
Underground Construction - January 2019 - 38
Underground Construction - January 2019 - 39
Underground Construction - January 2019 - 40
Underground Construction - January 2019 - 41
Underground Construction - January 2019 - 42
Underground Construction - January 2019 - 43
Underground Construction - January 2019 - 44
Underground Construction - January 2019 - 45
Underground Construction - January 2019 - 46
Underground Construction - January 2019 - 47
Underground Construction - January 2019 - 48
Underground Construction - January 2019 - 49
Underground Construction - January 2019 - 50
Underground Construction - January 2019 - 51
Underground Construction - January 2019 - 52
Underground Construction - January 2019 - 53
Underground Construction - January 2019 - 54
Underground Construction - January 2019 - 55
Underground Construction - January 2019 - 56
Underground Construction - January 2019 - IBC
Underground Construction - January 2019 - BC
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