Underground Construction - September 2021 - 30
Directional Drilling: Mini-HDD
The results illustrated in FIGURE 3 confirm placement
distances of more than 800 feet, even for the DR 17 pipe,
beyond the limit for typical mini-HDD operations.
It is noted that the mini-HDD calculations generally result
in considerably shorter possible placement distances than
that corresponding to application of the methodology and
equations provided in ASTM F1962, which may also include
the use of anti-buoyancy techniques to reduce buoyant
weight and significantly reduce required pull loads.
The shorter placement distances for mini-HDD
are also due to the increased drag ( " capstan effect " )
generated by the additional route curvature of mini-HDD
operations, due to path corrections. These corrections are
typically of greater magnitude and significance than that
encountered in well-controlled maxi-HDD installations.
In general, other methods for determining pulling
loads, including available software tools, are typically
based on well-controlled maxi-HDD installations and
not representative of actual mini-HDD applications
with respect to anticipated pull loads.
FIGURE 3 Predicted Mini-HDD Pull Load vs. Safe Pull Tension, HDPE
(PE4710) Pipe
Nominally Straight Path, 2-inch Drill Rods
(Source: Outside Plant Consulting Services, Inc.)
Although the MAB-7 guidelines are primarily described
with respect to mini-HDD operations, the information
may also be applicable to midi-HDD installations. Thus,
midi-HDD guidelines and associated practices may
be obtained from the MAB-7 document and/or ASTM
F1962, depending upon the particular application
and the judgment of the contractor or engineer. *
DR. LAWRENCE SLAVIN is the president of Outside Plant
Consulting Services Inc., in New Jersey, (973) 983-0813, lslavin@ieee.org
Register for FREE at UConOnline.com/Webcasts
LIVE WEBCAST
Thursday, September 23, 2021 | 10 a.m. CDT / 3 p.m. UCT
Coming Together to Train and Develop the
Future Workforce
Ditch Witch's Cory Maker will be joined by Steve Sellenriek, President of Sellenriek
Construction and Cole Shaefer, State Technical College of Missouri, Department
Chair and Technical Instructor. This panel will discuss the need for qualified
operators, how this project got started, how it's going and where it's headed. In
short, a manufacturer, a contractor and a college are coming together to help
assist with one of the industry's biggest pain points: labor.
Sponsored By:
Hosted By:
SPEAKER:
Cory Maker
HDD Product Manager
Ditch Witch
SPEAKER:
Steve Sellenriek
President
Sellenriek Construction
SPEAKER:
Cole Schaefer
Department Chair, Utility
Systems Technician
State Technical College
of Missouri
MODERATOR:
Jeff Awalt
Executive Editor
Underground
Construction
30 SEPTEMBER 2021 | UCONonline.com
http://www.UConOnline.com/Webcasts
http://www.UCONonline.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
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Underground Construction - September 2021 - 50
Underground Construction - September 2021 - Cover3
Underground Construction - September 2021 - Cover4
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