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APPENDIX 2F
MODEL SPECIFICATIONS
Chapter 2
Helical Foundation Systems
MODEL SPECIFICATION FOR
HELICAL SOIL NAILS
EARTH RETENTION APPLICATIONS
1
SCOPE
1.1 The work consists of designing, furnishing and installing helical soil nails and load transfer
devices for helical soil nail walls or slopes according to the project Plans and these specifications.
1.2 The parties and contract terms referred to in this specification are as follows:
1.2.1 The Owner is the person or entity that owns the facility or will own the facility once it
is completed. The Owner may have contractual agreements with, and be represented
by, other parties such as engineers, architects or contractors that perform services
under the direction of the Owner. Where Owner is used in this specification, it refers
to the Owner or the Owner’s contracted representatives separate from the Installing
Contractor.
1.2.2 The Soil Nail Designer is the individual or firm generally hired by the Installing Contractor
to design the helical soil nails.
1.2.3 The Installing Contractor installs and tests (if necessary) the helical soil nails, and
possibly performs other tasks associated with the project.
1.2.4 The Plans refer to the contract documents; including but not limited to the drawings and
specifications for the project.
1.3 Helical soil nail walls or slopes are built from the top down in existing ground. The work consists
of the following items as shown on the Plans:
1.3.1 Excavating in staged lifts in accordance with federal, state or local safety guidelines.
1.3.2 Installing helical soil nails to the specified minimum length, orientation and minimum
final termination torque.
1.3.3 Providing and placing drainage elements at the specified locations.
1.3.4 Placing wall or slope face steel reinforcement, attaching bearing plates and connection
devices and applying shotcrete or other specified facing over the reinforcement.
1.4 The work may include helical soil nail load testing.
1.5 The Owner will be responsible for obtaining right-of-way or easement access permits necessary
for the helical soil nail installation.
1.6 Unless otherwise noted, the Installing Contractor shall provide all labor, tools, equipment and
materials necessary to accomplish the work.
1.7 The Owner will provide suitable access to the construction site for the Installing Contractor’s
personnel and equipment.
