sample project special provision: 613slsf 06-29-06 1 revision of sections 613 and 715 screw-in light standard foundations sect

Sample Project Special Provision: 613slsf
06-29-06
1
REVISION OF SECTIONS 613 AND 715
SCREW-IN LIGHT STANDARD FOUNDATIONS
Sections 613 and 715 of the Standard Specifications and standard
special provisions are hereby revised for this project as follows:
Subsection 613.02(a) shall include the following:
Screw-in light standard foundations shall conform to the requirements
of subsection 715.02.
Subsection 613.04 shall include the following:
The Contractor may substitute screw-in galvanized steel foundations
for light standard foundations.
Screw-in foundations shall be installed only where soil testing shows
that the maximum aggregate size is less than 3 inches in diameter. The
Contractor shall test and report soil conditions to the Engineer as
necessary to ensure proper installation of screw-in foundations.
The Contractor shall install screw-in foundations according to the
manufacturer’s recommended procedures using either a boom type or a
bed-mounted type digger truck. The maximum torque used shall not
exceed the manufacturer’s recommended limits. If approved by the
Engineer, the Contractor may install the foundation in a pre-drilled
hole when difficult soils require a torque that exceeds the capacity
of capacity of the installation equipment or the mechanical limit of
the foundation to be exceeded. The predrilled hole shall not be larger
than the foundation shaft diameter. The Contractor shall follow the
minimum recommended torque requirements when the foundation is
installed in a predrilled hole. The installation torque may be
measured by a torque-measuring device or by calibrating the hydraulic
system of the installing equipment.
Subsection 715.02 shall include the following:
Screw in foundations shall be a type and manufacture previously
approved by the Department. Screw-in foundations shall have a minimum
auger helix pitch of 3 inches and shall be galvanized according to
ASTM A 153. The following minimum screw-in foundation sizes are
required for a 40-foot light standard:
No. of Mast Arms
Foundation Inside Diameter and Length
Outside Diameter of Helix
1
6 inch by 7 foot
12 inch
2
8 inch by 7 foot
14 inch
The cableway openings in the screw-in foundation shall be 2-1/2 by 12
inches. The openings shall have rounded ends and run vertically with
the top 12 inches below the base plate. The baseplate shall have a
pole mounting surface free from curvature or other deformity. The
baseplate shall be machine-smooth and flame-cut on the external edges
and on the inner hole providing access to the foundation interior. The
size of the baseplate shall be adequate to provide actual contact
support at outer corners and edges of the lighting structure or
breakaway mounting device. The baseplate shall be permanently marked
to indicate the locations of the cableway openings. It shall have the
thickness required by the manufacturer’s design, based on shape of
plate and number of mast
2
REVISION OF SECTIONS 613 AND 715
SCREW-IN LIGHT STANDARD FOUNDATIONS
arms. Bolt holes shall be provided through the baseplate for the
attachment of a breakaway device or light structure as specified on
the plans. If tapped holes are used, they shall be center tapped
perpendicular to the baseplate ± 1 degree. After the baseplate is hot
dip galvanized, the threads shall be fully cleaned so a bolt may be
hand turned in the threads. Baseplate material shall conform to ASTM A
709 Grade 36.
The screw-in foundation shaft shall be flame cut to length. The shaft
shall be 90 degrees square on top and truly helical on the bottom.
Cableway openings shall be smooth cut on both sides of the shaft 180
degrees apart unless otherwise specified. The sides of the cableway
openings shall be parallel to the axis of the shaft ± ½ degree as
measured along their full length. Round shaft material shall be new,
unused, and mill-traceable. The edges shall be mechanically cleaned
before the welding operation. The shaft shall be fabricated from
standard weight pipe conforming to ASTM A 53, Type E or S, Grade B or
ASTM 252, Grade 2.
The helix on screw-in foundations shall be truly helical. The helix
shall be produced with a matching metal die from formable weldable
⅜-inch thick steel conforming to ASTM A29, Grade M 1010. The preformed
helix shall be tumbleblasted to remove scale and contaminants before
welding.
The screw-in foundation pilot point shall be sheared on a 45 degree
angle from 1.25 inch diameter round bar steel conforming to ASTM A
575. It shall project a minimum of 6 inches below the leading edge of
the helix and shall be tumbleblasted prior to welding.
Screw-in foundations shall be supplied with lighting standard to base
plate connection hardware consisting of 1 inch by 10 UNC, 4 inch long
Grade 8 hex head bolts, nuts, and washers. The bolts, nuts, and
washers shall be galvanized in accordance with ASTM A 153.
All welding for fabrication of screw-in foundations shall be in
accordance with Sections 1 through 8 of AWS D1.1.
Completed screw-in foundations shall be hot dip galvanized in
accordance with ASTM A 153 after fabrication. Minor damage to the
coating shall be field repaired by thoroughly cleaning the damaged
area with a wire brush and removing all damaged and loose coating. The
cleaned areas shall be painted with two coats of zinc rich paint
meeting the requirements of Federal Specification TT-P-641 or
MIL-P-21035.
The lot or piece number identifying each screw-in foundation shall be
clearly stamped or painted on the foundation where it will not be
visible after installation. The foundation will be accepted on the
basis of visual examination at the project site and the manufacturer’s
Certificate of Compliance. When requested by the Engineer, the
Contractor shall furnish the manufacturer’s Quality Control Inspection
Reports and shall provide certification with regard to:
1.
Material Application
2.
Welder Certification
3.
Weld Quality
4.
Coating Requirements

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