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Chapter 2
Helical Foundation Systems
CHAPTER 2
HELICAL FOUNDATION SYSTEMS
2.12 Installation
2.12.1 General Information
2.12.1.1 Preparation
Prior to any excavation or installation of helical
piles or tiebacks, all utilities, pipelines, cables,
or any other service lines or structures shall be
identified and marked. The appropriate utility
locating agency should be contacted in advance
of the project, allowing adequate notification
time frames mandated by the agency.
Call number “811” is a federally mandated
FCC designated N-11 number.
The 811
number is a national “Call Before You Dig” phone
number designated by the FCC to eliminate
the confusion of multiple “Call Before You Dig”
numbers, minimize damages to underground
utilities and help save lives. One easy phone
call to 811 quickly begins the process of getting
underground utility lines marked. Local One
Call Center personnel will then notify affected
utility companies, who will send crews to mark
underground lines for free.
Foremen and installers should be mindful of
potential hazards and understand the meanings
and definitions of common tags provided by
the American National Standards Institute
(ANSI) and the Occupational Safety and Health
Administration (OSHA)
(Figure 2.12.1.1.a)
.
ANSI Z535.5 Definitions:
•
Danger:
Indicate[s] a hazardous situation which, if not avoided, will result in
death or serious injury. The signal word "DANGER" is to be limited to the
most extreme situations. DANGER [signs] should not be used for property
damage hazards unless personal injury risk appropriate to these levels is
also involved.
•
Warning:
Indicate[s] a hazardous situation which, if not avoided, could
result in death or serious injury. WARNING [signs] should not be used for
property damage hazards unless personal injury risk appropriate to this level
is also involved.
•
Caution:
Indicate[s] a hazardous situation which, if not avoided, could result
in minor or moderate injury. CAUTION [signs] without a safety alert symbol
may be used to alert against unsafe practices that can result in property
damage only.
•
Notice:
[this header is] preferred to address practices not related to
personal injury. The safety alert symbol shall not be used with this signal
word. As an alternative to “NOTICE” the word “CAUTION” without the safety
alert symbol may be used to indicate a message not related to personal
injury.
The OSHA 1910.145 definitions for tags are as follows:
•
Danger:
"shall be used in major hazard situations where an immediate
hazard presents a threat of death or serious injury to employees. Danger
tags shall be used only in these situations."
•
Warning:
"may be used to represent a hazard level between "Caution" and
"Danger," instead of the required "Caution" tag, provided that they have a
signal word of "Warning," an appropriate major message, and otherwise
meet the general tag criteria of paragraph (f)(4) of this section."
•
Caution:
"shall be used in minor hazard situations where a non-immediate
or potential hazard or unsafe practice presents a lesser threat of employee
injury."
Figure 2.12.1.1.a