Technical Manual

Inc.

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APPENDIX 2F

MODEL SPECIFICATIONS

Chapter 2

Helical Foundation Systems

13.1.2.3 Replace the anchor with one having a different helix plate configuration. The

replacement anchor must be installed to satisfy the minimum embedment

length criterion. It must also be embedded to a length that places the last

helix plate at least three times its own diameter beyond the depth of the first

helix plate of the replaced anchor without exceeding any applicable maximum

embedment length requirements, and it must meet the minimum final torsional

resistance criterion.

13.1.3 If the installation reaches a specified maximum embedment length without achieving

the minimum torsional resistance criterion:

13.1.3.1 If allowed, remove and reinstall the anchor at a position at least three times

the diameter of the largest helix plate away from the initial location. Original

embedment length and torsional resistance criteria must be met. The anchor

repositioning may require the installation of additional helical anchors with

nominal loads adjusted for these spacing changes, or

13.1.3.2 Demonstrate acceptable anchor performance through anchor load testing, or

13.1.3.3 De-rate the load capacity of the helical anchor based on default or site specific

torque correlation factors and install additional anchors as necessary, or

13.1.3.4 Replace the anchor with one having a different helix plate configuration. The

replacement anchor must be installed to satisfy the minimum and/or maximum

embedment length criterion and it must meet the minimum final torsional

resistance criterion.

13.1.4 If a helical anchor fails to meet the acceptance criteria in an anchor load test:

13.1.4.1 Install the anchor to a greater depth and installation torque and re-test; provided

that, if a maximum embedment length constraint is applicable, continued

installation will not exceed said maximum length constraint, or

13.1.4.2 Replace the anchor with one having more and/or larger helix plates. The

replacement anchor must be embedded to a length that places the last helix

plate at least three times its own diameter beyond the depth of the first helix

plate of the replaced anchor without exceeding any applicable maximum

embedment length requirements. The replacement anchor must be re-tested,

or,

13.1.4.3 De-rate the load capacity of the helical anchor based on the results of the

load test and install additional anchors. Additional anchors must be installed

at positions that are at least three times the diameter of the largest helix plate

away from any other anchor locations.

13.1.5 If a helical anchor fails a production quality control criterion as described in this Section

or for any reason other than described in this Section, any proposed remedy must be

approved by the Owner prior to initiating its implementation at the project site.