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APPENDIX 2F
MODEL SPECIFICATIONS
Chapter 2
Helical Foundation Systems
in a manner which will allow for constructing the wall facing to the specified minimum
thickness and to the line and grade indicated on the Plans.
11.8.3 The Owner shall perform the excavation for the soil nail wall under the direction of
the Installing Contractor. Care shall be taken to excavate to the final wall face using
procedures that: (1) prevent over-excavation; (2) prevent ground loss, swelling, air
slaking, or loosening; (3) prevent loss of support for completed portions of the wall; (4)
prevent loss of soil moisture at the face; and (5) prevent ground freezing.
11.8.4 The exposed unsupported final excavation face cut height shall not exceed the vertical
nail spacing plus the required reinforcing lap or the short-term stand-up height of the
ground, whichever is less. Excavation to the next level shall not proceed until helical soil
nail installation, reinforced shotcrete or other wall or slope facing placement, attachment
of bearing plates and connection means and nail testing has been completed and
accepted in the current lift. Shotcrete shall have cured for at least 72 hours or attained
at least its specified 3-day compressive strength before excavating the next lift.
11.9 Helical Soil Nail Installation
11.9.1 Installing Contractor shall determine the installation method necessary to achieve the
helical soil nail pullout resistance specified herein or on the Plans, in accordance with
the helical soil nail acceptance criteria in the Helical Soil Nail Testing section. Install
sacrificial helical soil nails for verification testing using the same equipment, methods,
nail inclination and soil nail models as planned for the production soil nails.
11.9.2 No installation of production helical soil nails will be permitted until successful pre-
production verification testing of nails is completed and approved by the Owner. The
number and location of the verification tests will be as indicated on the Plans or specified
herein.
11.9.3 During installation of the helical soil nails, the torque required to install each soil nail
shall be monitored and recorded. The installation records shall include the following
information:
11.9.3.1 Date and time of installation
11.9.3.2 Gear motor make and model
11.9.3.3 Location of helical soil nail and nail identification number
11.9.3.4 Actual helical soil nail model and configuration
11.9.3.5 Quantity and length of lead and extension sections installed
11.9.3.6 Installation torque log taken in minimum 5-foot increments of the total soil nail
length and the final installation torque
11.9.3.7 Actual inclination of the soil nail
11.9.3.8 Comments pertaining to interruptions, obstructions, or other relevant
information