MODEL SPECIFICATION

HELICAL ANCHOR FOUNDATIONS

TENSION APPLICATIONS

Prepared by the
Helical Piles and Tiebacks Committee
of
The Deep Foundations Institute

First Edition
1st Printing, 2014

Deep Foundations Institute

326 Lafayette Avenue
Hawthorne, New Jersey 07506 USA
www.dfi.org

Copyright, 2014
Deep Foundations Institute

Printed in USA
 PREFACE AND ACKNOWLEDGEMENTS

This document was prepared by the Deep Foundations Institute (DFI) Helical Piles and Tiebacks Committee. If you have received
this document from a source other than by purchase from DFI, please contact DFI at (973) 423-4030 to officially purchase this
document and support the future foundation developments of DFI. It is a violation of the copyright to distribute this document to
others.

This document was developed by the Helical Piles and Tiebacks Committee to provide practical
guidance for the specification of helical anchors. Model performance specification language is
provided for the design, construction and testing of helical anchorages for tension applications.
Typical tension applications include earth retention and shoring, transmission tower guy
tiedowns, and buoyancy/uplift protection. Examples of typical tension applications for helical
anchors are depicted in Figure 1.

Specifications for helical anchorages are typically one of the following types:

1. Prescriptive Specifications – The Owner or their representative specifies the products and
procedures to be used. The installing contractor is responsible for following the details of
the specification; the Owner is responsible for the resulting performance of the system.
2. Open Specifications – The installing contractor is permitted control over both the scope and
the design of the installation, and is then responsible for ensuring adequate performance.
This type specification is often used for temporary work, but is not recommended for
permanent installations.
3. Performance Specifications – The installing contractor is permitted control over certain
aspects of the design and/or construction process, but must demonstrate to the owner
through certification and/or testing that the final product can be expected to meet the
owner’s defined needs. The owner retains responsibility for defining the needs in an
objective and measurable or demonstrable manner.

The DFI Helical Piles and Tiebacks Committee recommends performance specifications over
either prescriptive or open specifications. The use of performance specifications allows the
Owner/Owner’s representative to concentrate on defining what constitutes adequate
performance in the context of the specific project and leaves the detailed design work to
persons more familiar with helical anchorage design and application. The Owner/Owner’s
representative, anchor designer and installing contractor will together be responsible for the
tasks associated with the design, installation, acceptance and performance of the helical
anchorage. It is important to clearly define the roles and responsibilities of every party on each
project to promote good communication and reduce potential for contractual misunderstandings.

The installation of helical anchors requires specialized equipment, techniques and appropriate
workmanship. To specify every important detail of the work would be both burdensome for the
specifier and oppressive for the installing contractor. The Owner’s needs can be more
effectively served by specifying the required performance, selecting competent helical anchor
designers and installing contractors to carry out the work, and auditing the work with an
appropriate level of testing. The following Model Specification is written as a performance
specification, but can be modified to an open or prescriptive specification if necessary.

The Helical Piles and Tiebacks Committee acknowledges former chairmen Dr. Samuel
Clemence, Robert Hoyt, and Dr. Howard Perko for their leadership and contributions in the
writing and editing of this specification.

Gary L. Seider, P.E., Chair, DFI Helical Piles and Tiebacks Committee

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 Figure 1. Example es of typical tension
t appllications for helical anch
hors
a) retain
ning wall tieb
back, b) basement wall ttieback, c) p pipeline tiedo
own,
d) basement slab
s tiedown, e) guy wiree tiedown, f) buoy stay.

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 2014 Deep Foundations Institute
Helical Piles and Tiebacks Committee

Chair:
Gary L. Seider, P.E. Hubbell Power Systems, Inc. / Chance®

Immediate Past Chair:

Howard A. Perko, Ph.D. P.E. Magnum Piering Inc.

Trustee Liaison:
Dan Brown, P.E. Ph.D. Dan Brown and Associates PLLC

Current Members:
Salah Al Dilimi Road and Transport Authority (RTA)
Garett D. Bell Patriot Foundation Systems
Luis Berrospid Helical Anchors Inc.
Bill Bonekemper Helical Pile World LLC
John Boulware, Jr. Brackett Foundation Support Systems Inc.
Tom Bradka, M.Eng., P.Eng Helical Pier Systems
David A. Bruce Hubbell Power Systems, Inc. / Chance
Mark Bryant, EIT Maclean Power Systems Civil Products Group
James A. Cherry, P.E.
Samuel P. Clemence, Ph.D. Syracuse University
Frank D'Angelo Danbro Distributors
Steve Davidow P.E., S.E. Crux Subsurface Inc.
Don Deardorff, P.E. Foundation Supportworks Inc.
Bernard Dwyer, Jr. Magnum Piering Inc.
Mohamed Elkasabgy, Ph.D., P.Eng. AMEC E&I
Nick Farkas Grip-Tite Mfg. Co. LLC
Mike Jennings Maclean Power Systems Civil Products Group
Kevin Kaufman Piertech Systems
Greg Keefer Helical Technology
Jeff Kortan, P.E. Foundation Supportworks Inc.
Wei-Chung Lin, P.E. MacLean Power Systems Civil Products Group
Jinyuan Liu, Ph.D., P.E., P.Eng. Dept of Civil Eng @ Ryerson Univ
Michael Melworm Premium Technical Services
Kyle Olson, P.E. Foundation Supportworks Inc.
John S. Pack, P.E. International Marketing & Res., Inc.
Frank Queen Foundation Technologies Inc.
Randy E. Robertson, P. Eng. Cyntech Helical Piles
Ranjith Samuel Rosenberk, Ph.D. Ram Jack Systems
Rajan S.N. B.E. Larsen & Toubro Ltd - L&T Geostructure
Mohammed Sakr, P.Eng., Ph.D. Iron Brothers Ltd
Nick Salisbury Crux Subsurface Inc.
Moncef S. Souissi CTL Thompson Inc.
Giovanni Spagnoli, Ph.D. BAUER Maschinen GmbH
Dave Thrasher Foundation Supportworks Inc.
Robert Tucker Maclean Power Systems Civil Products Group
Jeff Warchall, P.E. Maclean Power Systems Civil Products Group
Darin Willis, P.E. Ram Jack Systems
Yasser Abdelghany, P.Eng., Ph.D Ministry of Transportation & Infrastructure

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 TABLE OF CONTENTS

1. SCOPE.................................................................................................................................... 1

2. DEFINITIONS ......................................................................................................................... 2

3. DESIGN AND PERFORMANCE REQUIREMENTS ............................................................... 4

4. PLACEMENT REQUIREMENTS ............................................................................................ 4

5. PRECONSTRUCTION SUBMITTALS .................................................................................... 5

6. DESIGN SUBMITTALS ........................................................................................................... 6

7. ANCHOR INSTALLATION ...................................................................................................... 6

8. TERMINATION CRITERIA...................................................................................................... 7

9. INSTALLATION RECORD SUBMITTALS .............................................................................. 9

10. ANCHOR TESTING .............................................................................................................. 10

11. CLEANUP ............................................................................................................................. 10

12. MEASUREMENT AND PAYMENT ....................................................................................... 10

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 MODEL SPECIFICATION FOR HELICAL ANCHOR FOUNDATIONS
TENSION APPLICATIONS

This model specification includes sample text shown in normal font with commentary in italics.
The commentary is intended to highlight project-specific items the specification writer should
consider during development of the specification. In some sections, typical values are
presented to indicate common practice, and these values may be changed to reflect project-
specific requirements. The commentary should be removed before using the specification for
a project.

1. SCOPE

The work consists of designing, furnishing, installing, post-tensioning and testing helical
anchors used to support tension loads, and any ancillary materials (e.g., load transfer
devices, etc.) according to the project plans provided and these specifications. Unless
otherwise noted, the installing contractor shall provide all labor, tools, equipment, and
materials necessary to accomplish the work.

The parties referred to in this specification are as follows:

 The Owner is the property owner.
 The Owner’s representative is the individual or firm hired by the Owner to execute
project tasks required for the successful design and construction of the overall project.
Tasks could include construction management, design, oversight, etc.
 The anchor designer is the individual or firm generally hired by the installing contractor
to design the helical anchors.
 Installing contractor installs and tests (if necessary) the helical anchors, and possibly
other tasks associated with the project.

It is important to clearly define the roles and responsibilities of every party on each project to
promote good communication and reduce potential for contractual misunderstandings.
Different types of contractual vehicles (design-build, value engineering, etc.) require different
roles and responsibilities for the various parties, which should be considered in specification
development.

The Owner will provide suitable access to the construction site for the installing contractor’s
personnel and equipment. Unless specifically noted otherwise in the contract documents, the
Owner will remove and replace any structures, utilities, pavements, landscaping or other
surficial improvements in the work area as necessary to facilitate the work. The Owner will be
responsible for overall construction oversight to minimize potential for developing unsafe
conditions. The work may include post-construction monitoring of anchor performance if
required by the Owner or the anchor designer to confirm performance of the anchors
subsequent to their installation. The work may also include installation of additional anchors if
the initial installation does not meet specified capacity or performance requirements.
Responsibility for providing subsurface investigation shall be addressed in the bid documents.
The Owner is responsible for providing to the installing contractor all available subsurface
soils, rock and groundwater information and geotechnical testing data.

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2. DEFINITIONS

A schematic drawing of a helical anchor is provided as Figure 2, and anchor components and
design and construction terms are defined below. Helical anchors are installed by screwing
the anchor assembly into the soil with crowd to resist tensile loads through bearing of the
helical plates on the soil in which they are embedded. When rotated in the ground, the helical
shape provides thrust along its longitudinal axis thus aiding in anchor installation.

Figure 2. Typical helical anchor components.

Anchorage: A combination of anchor and the soil or highly weathered rock into which it is
installed that together resist tension loads applied to the anchor.

Bearing Stratum: The soil or highly weathered rock layer which provides the axial tension
resistance for the installed helical anchor.

Crowd: Axial compressive force or pressure applied to the helical anchor as needed during
installation to ensure the anchor advances into the ground a minimum of 80% of the distance
equal to the helix pitch for each revolution.

Declination Angle: angle of inclination between the longitudinal axis of the helical anchor and
the horizontal as measured downward from the horizontal.

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Deflection: the axial displacement of the anchor as measured at the anchor head at applied
load.

Extension Section: Helical anchor component that connects the lead section to the load
transfer device (see Figure 2). Extension sections may be plain (without helix plates) or helical
(including one or more helix plates).

Effective Torsional Resistance: The average installation torque typically taken over a distance
equal to the last three diameters of penetration of the largest helix plate in the specified
bearing stratum.

Factored Load: Service load times the required load factor.

Geotechnical Capacity (a.k.a. Ultimate Soil Capacity): The maximum tension load that can be
resisted through the bearing of helix plates on the soil or highly weathered rock in which they
are embedded (as characterized by the available subsurface soils, rock and groundwater
information and geotechnical testing data) without exceeding the specified performance
criteria.

Helical Anchor (a.k.a. helical tieback or screw anchor): Consists of 1) one or more helix plates
attached to a central shaft and 2) load transfer device for attachment to a structure. May also
include surface coating or other corrosion protection means.

Helix Plate: Generally round steel plate formed into a helical spiral and welded to the central
steel shaft.

Lead Section: The first helical anchor component installed into the soil. It consists of one or
more helical plates welded to the central steel shaft.

Limit State: A condition beyond which a helical anchor component or interface becomes no
longer useful for its intended function (serviceability limit state) or to be unsafe (strength limit
state).

Load Test: A procedure to determine the deflection of an anchor under tension loading.

Load Transfer Device: structural component of the helical anchor that connects the structure to
the anchor and transfers the applied load to the anchorage.

Load Factor: A factor that accounts for deviations of the actual load from the service load
(Load Resistance Factor Design).

Loads: Forces or other actions as defined by the Owner/Owner’s representative that must be
resisted by the anchors. Permanent loads are those loads in which variations over time are
rare or of small magnitude. All other loads are variable loads (see also Service Load below).

Mechanical Strength: The maximum tension load that can be resisted by the structural
elements of a helical anchor.

Pitch: The distance measured along the axis of the shaft between the leading and trailing
edges of the helix plate.

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Safety Factor: The ratio of the ultimate capacity to service load used for the design of any
helical anchor component or interface (Allowable Stress Design).

Service Load: The total magnitude of the unfactored loads determined by the Owner’s
representative that must be resisted by the anchors.
Reveal: The distance from the ground surface in which the anchor is installed to the top of the
uppermost extension section, measured along the anchor’s longitudinal axis.

Torque: The measure of the rotational force times the moment arm needed to overcome the
shear strength of the soil (ft-lb, N-m]. Torque is used in an empirical approach for predicting
the ultimate capacity of a helical anchor.

Ultimate Pullout Resistance: Limit state based on the lesser of mechanical strength or
geotechnical capacity of the helical anchor defined as the point at which no additional load can
be applied without exceeding the specified performance criteria.

3. DESIGN AND PERFORMANCE REQUIREMENTS

A. Helical anchors shall be designed (overall anchor length, helix configuration and minimum
effective torsional resistance) to support the service load(s) with the applicable factor of
safety as shown on the project plans.

B. Except where noted otherwise on the project plans, all anchor components shall be
designed to provide a minimum safety factor for mechanical strength of ___ (2.0 typical).

C. Except where noted otherwise on the project plans, all anchors shall be designed and
installed to provide a minimum safety factor for ultimate pullout resistance of ___ (2.0
typical), a maximum axial deflection at service load of ___ inch (1 inch typical), and must
satisfy the deflection criteria as stated on the plans or drawings.

D. Except where noted otherwise on the project plans, each anchor shall be designed to meet
a corrosion service life of ___ years (50 years typical for most building codes, 75 years for
permanent transportation structures, no requirement for temporary structures).

E. The anchorage design shall take into account anchor spacing, soil stratification, long term
soil consolidation, corrosion, creep, and strain compatibility issues as are present for the
project.

F. If on-site load testing is to be performed, the anchorages shall be designed such that the
maximum test load does not exceed ____% (90% typical) of the manufacturer’s rated
mechanical strength of any anchor component or load transfer device.

4. PLACEMENT REQUIREMENTS

When helical anchor placement is shown on the project plans, production anchors shall be
placed such that the anchor head is within ___ inches (3 inches typical) laterally and
longitudinally and ___ inch (1/2 inch typical) axially of plan; and the anchor shaft alignment is
within ___ degrees (5 degrees typical) of the declination angle shown on the project plans.
When anchor placement is not shown on the project plans, the placements, alignments and
their respective tolerances shall be included as part of the design submittal.

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5. PRECONSTRUCTION SUBMITTALS

The installing contractor and/or anchor designer shall submit to the Owner/Owner’s
representative a proposal including the following submittals, in addition to other qualifications
as listed in the overall project specifications/plans. Work shall not begin until all the submittals
have been received and approved by the Owner. All costs associated with incomplete or
unacceptable submittals shall be the responsibility of the installing contractor.

The specification writer must define the specific competence submittals that satisfy the local
governing building codes and project needs. All of the submittals below may or may not be
needed for every project. The list of submittals in the final specification text should include the
required documentation from the listings in 5.A, 5.C and 5.D, below.

A. Evidence of installing contractor’s competence:

A.1 Anchor manufacturer’s certificate showing the installing contractor’s
competency to install the manufacturer’s helical anchors.
A.2 A list of at least three projects completed successfully within the previous three
years wherein the installing contractor installed helical anchors in comparable
soil conditions and for service loads similar to those shown in the project plans.
The list shall include names and phone numbers of those project owners’
representatives who can verify the installing contractor’s participation in those
projects. The specification writer may change the number of projects as needed
to meet the requirements of the project.
A.3 A letter from the anchor manufacturer, anchor distributor or manufacturer’s
representative expressing ability and intent to provide on-site supervision of the
anchor installation.

B. Evidence of installing contractor’s safety record includes a listing of all safety violations
lodged against the installing contractor within the previous three years and the current
status or final resolutions thereof. Descriptions of safety improvements instituted within
the previous three years may also be submitted, at the installing contractor’s discretion.

C. Evidence of anchor designer’s competence:

C.1 A recommendation from the anchor manufacturer, anchor distributor or
manufacturer’s representative.
C.2 Where required by regulations, recognition by the local jurisdictional authority or
proof of registration as a Professional Engineer registered in the state in which
the anchors are being installed, or
C.3 A list of at least three projects completed within the previous three years
wherein the anchor designer designed helical anchors for comparable soil
conditions and for service loads similar to those shown in the project plans.
The list shall include names and phone numbers of those project owners’
representatives who can verify the engineer’s participation in those projects.
The specification writer may change the number of projects as needed to meet
the requirements of the project.

D. Evidence of anchor manufacturer’s competence and capability:

D.1 Proof of at least three years of production experience making helical anchors.
D.2 Proof that the manufacturer’s helical anchors have been used successfully in at
least three engineered construction projects within the last three years. The
specification writer may change the number of projects, as appropriate.

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 D.3 Product evaluation approved by the applicable building code authority (e.g.,
International Code Council Evaluation Services (ICC-ES)).
D.4 Product acceptance by the local building code official(s) having jurisdiction over
the project.

6. DESIGN SUBMITTALS

Within ___ weeks of receiving the contract award, the installing contractor and/or anchor
designer shall submit helical anchor submittals as outlined below:

A. An anchor hardware schedule showing, for each category of anchorage:

A.1 Product designations for helix and extension sections and all ancillary products
to be supplied at each helical anchor location.
A.2 Individual anchorage service loads.
A.3 Individual anchorage post-tensioning requirements (if any).
A.4 Manufacturer’s published mechanical strengths for the anchor assemblies,
including load transfer devices.
A.5 Calculated geotechnical capacity of anchors based on geotechnical information.
A.6 Minimum effective torsional resistance criteria.
A.7 Maximum allowable installation torque of anchor.
A.8 Minimum embedment lengths and such other site specific embedment depth
requirements as may be appropriate for the site soil profiles.

B. If anchor placements are not shown on the project plans, drawings showing the
proposed anchor placements and placement tolerances. Known Rights of Way and
obstructions (provided by the Owner) shall be shown to demonstrate how the anchors
will be installed to avoid these items.
C. Proposed production quality control plan, including method and equipment to be used
to measure torque during installation.
D. Procedures for proposed performance and/or proof testing, including certification that
the proposed post-tensioning and load test equipment (if any) can be safely and
accurately used to apply and hold the proposed loads.
E. A design submittal prepared by the anchor designer which shows that the selected
anchors can be installed to achieve the performance requirements (Section 3) of the
project plans and this specification. Typically, the Owner is responsible for defining
acceptance criteria and any post-construction requirements. However, if the anchor
designer will define the anchor acceptance criteria for the Owner, all criteria should be
outlined in the design submittal.
F. Copies of certified calibration reports for torque measuring equipment and load
measuring equipment (if required) to be used on the project. The calibrations shall
have been performed within 12 months of the proposed starting date for helical anchor
installation or as recommended by the equipment manufacturer based on the proposed
starting date.

7. ANCHOR INSTALLATION

A. Before entering the construction site to begin work, the installing contractor shall
provide proof of insurance coverage as stated in the general specifications and/or
contract.

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B. Installing contractor shall furnish and install all helical anchors per the project plans and
approved anchorage design submittals. In the event of conflict between the project
plans and the approved anchorage design submittal, the installing contractor shall not
begin construction until such conflict has been resolved.

C. The installing contractor shall conduct his construction operations in a manner to

ensure the safety of persons and property in the vicinity of the work. The installing
contractor’s personnel shall comply with safety procedures in accordance with OSHA
standards and any established project safety plan.

D. The installing contractor or Owner shall request marking of underground utilities by an

underground utility location service as required by law, and shall avoid contact with all
marked underground facilities. Owner of site shall provide to installing contractor any
private utility information.

E. The portion of the construction site occupied by the installing contractor, his equipment
and his material stockpiles shall be kept reasonably clean and orderly.

F. Installation of helical anchors may be observed by representatives of the Owner for

quality assurance purposes. The installing contactor shall give the Owner’s
representative at least 24 hours prior notice of anchor installation operations. All
helical anchor sections and ancillary products shall be marked as necessary to allow
correlation with the anchor design submittal before shipment from the manufacturer.

G. The helical anchor installation technique shall be consistent with the geotechnical,
logistical, environmental, and load carrying conditions of the project. The lead section
shall be positioned at the location as shown on the project plans or in the anchor
design submittal, as applicable. The anchor may be positioned perpendicular to the
working face or surface to assist in initial advancement into the soil before the required
shaft angle shall be established. After initial penetration, the required declination angle
shall be established. The helical anchor sections shall be engaged and advanced into
the soil in a smooth, continuous manner at a rate of rotation of 5 to 25 rpm. Sufficient
crowd shall be applied to uniformly advance the helical anchor sections a minimum of
80% of the distance equal to the pitch of the helix plate (pitch is typically 3 inches) per
revolution. The rate of rotation and magnitude of crowd shall be adjusted for different
soil conditions and depths. Extension sections shall be provided to obtain the required
minimum overall length and minimum effective torsional resistance as shown on the
project plans.

8. TERMINATION CRITERIA

The specified minimum overall length criterion and the minimum effective torsional resistance
criterion must be satisfied prior to terminating the anchor installation. In the event any helical
anchor fails to meet these production quality control criteria, the following pre-qualified
remedies are authorized:

A. If the installation fails to meet the minimum effective torsional resistance criterion at the
minimum embedment length:

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 A.1. Continue the installation to greater depths in the specified bearing stratum until
the effective torsional resistance criterion is met, provided that continued
installation does not exceed specified maximum length (if applicable). Or,
A.2. Demonstrate acceptable anchorage performance through proof testing. Or,
A.3. Replace the anchor with one having a different helix configuration. The
replacement anchor must not exceed any applicable maximum embedment
length and either (A) be embedded to a length that places its last helix at least
three times its own diameter beyond the position of the first helix of the replaced
anchor and meet the minimum effective torsional resistance criterion, or (B) pass
proof testing.

B. If the torque measured during installation reaches the helical anchor’s allowable torque
rating prior to reaching the minimum embedment depth criterion, with approval from the
Owner/Owner’s representative. terminate the installation then proceed with one of the
following recommended actions:

B.1 Replace the anchor with one having a shaft with a higher torsional strength rating.
This replacement anchor must be installed to satisfy the minimum embedment
length criterion. It must also be embedded to a length that places its last helix at
least three times its own diameter beyond the position of the first helix of the
replaced anchor without exceeding any applicable maximum embedment length
requirements and it must meet the minimum effective torsional resistance
criterion. Or,
B.2 Replace or modify the anchor with one having a different helix configuration. This
replacement or modified anchor must be installed to satisfy the minimum
embedment length criterion. It must also be embedded to a length that places its
last helix at least three times its own diameter beyond the position of the first helix
of the replaced anchor without exceeding any applicable maximum embedment
length requirements, and it must meet the minimum effective torsional resistance
criterion. Or,
B.3 If allowed or approved by the Owner/Owner’s representative, remove and
reinstall the anchor at a position at least three times the diameter of the largest
helix away from the initial location. Original minimum embedment length and
effective torsional resistance criteria must be met for the repositioned anchor.
This anchor repositioning may require the installation of additional helical anchors
with service loads adjusted for these spacing changes.

C. If the installation reaches a specified maximum embedment length without achieving

the minimum effective torsional resistance criterion:

C.1. If approved by the Owner/Owner’s representative, remove and reinstall the

anchor at a position at least three times the diameter of the largest helix away
from the initial location. Original minimum embedment length and effective
torsional resistance criteria must be met for the repositioned anchor. This anchor
repositioning may require the installation of additional helical anchors with service
loads adjusted for these spacing changes. Or,
C.2. Demonstrate acceptable anchorage performance through proof testing, Or
C.3. Reduce the load capacity of the helical anchor and install additional anchors as
necessary. The reduced capacity and additional anchor location shall be subject
to the approval of the Owner/Owner’s representative. Or,

8
 C.4. Replace the anchor with one having a different helix configuration. This
replacement anchor must be embedded to a length that places its last helix at
least three times its own diameter beyond the position of the first helix of the
replaced anchor. This replacement anchor must be installed to satisfy the
minimum embedment length criterion and it must meet the minimum effective
torsional resistance criterion.

D. If a helical anchor fails to meet acceptance criteria in a performance or proof test:

D.1. Install the anchor to a greater depth and installation torque and re-test provided
that the maximum embedment length criterion (if applicable) is not exceeded. Or
D.2. Replace the anchor with one having more and/or larger helix plates. It must be
embedded to a length that places its last helix at least three times its own
diameter beyond the position of the first helix of the replaced anchor without
exceeding any applicable maximum embedment length requirements. This
replacement anchor must be re-tested. Or,
D.3. If approved by the Owner/Owner’s representative and or the anchor designer,
reduce the load capacity of the helical anchor and install additional anchors.
Additional anchors must be installed at positions that are at least three times the
diameter of the largest helix away from any other anchor locations and approved
by the Owner/Owner’s representative.

Proof testing to qualify an anchor under any of the foregoing remedial actions shall not be
used to satisfy proof testing frequency requirements shown in the project plans or the
approved design submittals.

If a helical anchor fails a production quality control criterion for any other reason, any proposed
remedy must be approved by the Owner/Owner’s representative prior to initiating its
implementation at the project site.

9. INSTALLATION RECORD SUBMITTALS

The installing contractor shall provide the Owner, or his authorized representative, copies of
individual helical anchor installation records within 24 hours after each installation is
completed. Formal copies shall be submitted (insert time frequency). These installation
records shall include, but are not limited to, the following information:

A. Date and time of installation.

B. Installation equipment type and operator name.
C. Plan location of helical anchor.
D. Anchor reveal.
E. As-built helical anchor type and configuration.
F. Total length of installed anchor.
G. As-built declination of anchor.
H. Torque measurements at 1 foot intervals over the for the last ___ feet (5 to 10 feet
typical but not less than 3 times the diameter of the largest helix plate) of installed
length, at a minimum.
I. Effective torsional resistance and calculated geotechnical capacity based on effective
torsional resistance and/or as derived from the pre-production test program.
J. Comments pertaining to interruptions, obstructions, or other relevant information.

9
10. ANCHOR TESTING

If anchor testing is required, the Installing Contractor shall furnish all labor, equipment and pre-
production helical anchors necessary to accomplish the testing as shown in the previously
submitted and approved anchor design submittals. The installing contractor shall apply the
specified loads for the specified durations and record the specified data, for the specified
number of anchors. No deviations from the test plan(s) will be allowed without explicit
approval in writing from the Owner/Owner’s representative. Anchor testing shall be in
accordance with the load-testing procedures and performance requirements deemed suitable
for the application by the Owner/Owner’s representative, or anchor designer.

Installing Contractor shall provide the Owner, or Owner’s representative, copies of field test
data or reports within 24 hours after completion of each load test. Formal test reports shall be
submitted within (insert amount of time) following test completion. Formal test reports shall
include, but are not limited to, the following information:

A. Name of project and installing contractor.

B. Name of installing contractor’s supervisor during installation.
C. Name of third party test agency, if any.
D. Type of test (pre-production or production test)
E. Date, time, and duration of test.
F. Unique identifier and location of helical anchor tested.
G. Type of test (performance or proof).
H. Description of calibrated testing equipment and test set-up.
I. Testing equipment calibration data.
J. Actual helical anchor type and configuration.
K. Steps and duration of each load increment.
L. Incremental and cumulative anchor-head movement at each load step.
M. Signatures as required by local jurisdiction

11. CLEANUP

Within (insert time period) of completion of the work, the installing contractor shall remove any
and all material, equipment, tools, building materials, concrete forms, debris, or other items
belonging to the Installing Contractor or used under the Installing Contractor’s direction.

12. MEASUREMENT AND PAYMENT

Helical anchors can be paid for in different ways, and the following items should be defined by
the Owner/Owner’s Representative:

QUANTITY DESCRIPTION UNIT

1 Mobilization/Demobilization Lump sum
As required Helical Trial Anchors Per anchor
Obstructions (Pay items as Per hour or Force
As required
defined in Contract) Account
Per foot (meter) or
As required Helical Anchor Installation
per anchor
As required Production Load Test Program Lump sum or per test

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