Technical Manual

Inc.

p 181

APPENDIX 2F

MODEL SPECIFICATIONS

Chapter 2

Helical Foundation Systems

EXECUTION

11.1 Installing Contractor shall furnish and install all helical soil nails per the project Plans and

approved soil nail design documentation. In the event of conflict between the project Plans

and the approved soil nail design documentation, the Installing Contractor shall not begin

construction on any affected items until such conflict has been resolved.

11.2 The Installing Contractor shall conduct their construction operations in a manner to insure 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.

11.3 The Owner shall request marking of underground utilities by an underground utility location

service as required by law, and the Installing Contractor shall avoid contact with all marked

underground facilities.

11.4 The portion of the construction site occupied by the Installing Contractor, his equipment and his

material stockpiles shall be kept reasonably clean and orderly.

11.5 Installation of helical soil nails may be observed by the Owner for quality assurance purposes.

The installing contractor shall give the Owner at least 24 hours’ notice prior to the soil nail

installation operations.

11.6 Construction Procedure

11.6.1 The wall or slope is to be constructed from the top down as the soil in front of the wall

is removed to specified depths and the helical soil nails are installed at each level.

11.6.2 The exposed soil face shall be retained with a construction facing consisting of mesh

reinforced shotcrete or other appropriate facing material. Drainage systems, when

required, shall be installed prior to applying shotcrete or other facing material.

11.7 Site Drainage Control

11.7.1 Provide positive control and discharge of all surface water that will affect construction

of the helical soil nail retaining wall or slope. Maintain all pipes and conduits used

to control surface water during construction. Surface water drainage network shall be

independent of the wall drainage network.

11.7.2 Contact the Owner if unanticipated subsurface drainage structures are discovered

during excavation.

11.8 Excavation

11.8.1 Excavation shall proceed in stages or lifts according to the Plans, exposing a minimum

amount of soil face which will still allow for the installation of the helical soil nails and

wall facing system while assuring stability of the excavated face.

11.8.2 The Owner shall be responsible for providing the necessary survey and alignment control

during excavation of each lift and for performing the excavation in a manner which will

allow for construction of the wall facing to the specified minimum thickness and to the

line and grade indicated on the Plans. The Installing Contractor shall be responsible

for locating and installing the helical soil nails within the allowable tolerances in this

specification or on the Plans, and for performing the excavation and nail installation