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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.
