Typical Sportslighting Specifications

Scope


These specifications apply to the manufacture of centrifugally cast prestressed concrete poles.
 

Design

  1. Poles shall be designed considering application of wind load and dead load.
  2. The moment at any point along the length of the pole is the sum of the moments resulting from dead loads and forces from wind loads. The wind force is equal to the wind pressure multiplied by the effective projected area (EPA) of the objects involved.
  3. Poles shall be designed to withstand a constant wind speed of 90, 100, 110, 120, 130, 140 or 150 MPH.

Materials

Concrete

The pole shall achieve a minimum 28-day compressive strength of 8,000 psi. Cement shall conform to the latest requirements of Type III or Type I Portland Cement in accordance with ASTM-C150. Maximum size aggregate may be 3/4” inch (19mm) or 3/4” of the clear spacing between reinforcing steel and surface of pole. Any water reducers, retarders, or accelerating admixtures shall conform to ASTM-C494. Water shall be free from foreign materials in amounts harmful to concrete and embedded steel. In areas subject to frequent freeze/thaw conditions an air entrapment admixture shall be used to produce a 5 -8% air content in the mix as measured prior to spinning.
 

Reinforcing Steel

Deformed steel reinforcement shall conform to requirements of ASTM A615 for Grade 60 Rebar.
 

Prestressing Steel

Prestressing steel reinforcement shall conform to uncoated 7-wire, stress relieved strand; ASTM-A416.
 

Spiral Reinforcement

Steel spiral reinforcement shall conform to the requirements of ASTM-A82 and shall not be less than .150 inch diameter.
 

Hardware

All structural steel shall conform to ASTM-A36 and zinc alloy AC41A shall conform to ASTMB240. The finish shall be hot dipped galvanized in accordance with ASTM A153.
 

Electrical Ground

All sportslighting poles will be supplied with a #6 stranded copper ground wire cast into the wall of the pole.
 

Manufacturing

  1. All manufacturing tolerance, details of reinforcement, and finishes shall be in accordance with the Guide Specification for Prestressed Concrete Poles as published in the May-June, 1982, issue of the Journal of the Prestressed Concrete Institute.
     
  2. A concrete cylinder test shall be performed for each 100 cubic yards of concrete poured. A final quality control check shall be carried out on each pole after manufacturing is complete. All quality control procedures shall be mandated in a written manual and be available for inspection.3,500 psi has been achieved.
     

Manufacture


The manufacturer shall have a minimum of 10 years of experience in the design and production of centrifugally spun concrete poles. The poles shall be manufactured by StressCrete.
 

General

  1. Poles shall be prestressed and the concrete placed in steel molds by the centrifugal spinning process. This method of manufacture ensures maximum compression of concrete resulting in unsurpassed durability.
  2. Poles shall have a smooth natural form finish, soft gray in color.
     
  3. Poles shall be designed and constructed so that all wiring and grounding facilities are concealed within the pole. All handholes, couplings, inserts for step bolts, thru-bolt holes and ground wire shall be cast into the pole during the manufacturing process.
     
  4. Poles shall be round in cross section and provide a continuous taper of .18" per foot of length and provide a minimum 3/4" of concrete coverage over the longitudinal steel.
     
  5. All cable entry holes shall be in accordance with the location and sizes as required by the buyer and shall be free from sharp edges for passages of electrical wiring. All handhole frames shall be composed of a non-metallic, non-conductive injection molded material or a rugged high density cast zinc.

     


    A. A 3" x 12" or 4" x 10" conduit entrance opening centered 18" below
    grade (depending on size of pole).
    B. A 3.5" x 10.5" handhole frame with flush cover centered 3' 6" above grade
    (or as specified).
    C. A 2.5"x 8.5" handhole frame with flush cover located 180 degrees from
    disconnect switches.
    D. Top wiring will be through a 2" or 1 1/2" threaded coupling which ever is suitable for the diameter of the pole with access by way of a 2 1/2" x 8” handhold frame with flush cover located at platform/crossarm level for use during installation and maintenance of electrical wiring. A “J” hook wire hanger will be provided at top coupling location for use with kellems grip. Or as needed by specifier.
    E. All poles shall be provided with a fish wire to facilitate cable installation.
     
  6. (Optional) Step bolts, 5/8" x 7" long step bolts complete with locking nuts, on staggered 15" centers. Steps will begin at 15' above groundline. Preferably step bolts to be on 15" centers and 180 degrees apart or as may be specified.
     
  7. An aluminum nameplate cast into the wall of the pole approximately 4' 5" above the groundline identifying the manufacturer, manufacture date, length, weight, class and fabrication number.
     
  8. (Optional) Lightning protection system.
     
  9. (Optional) Safety Climbing Cable shall be 5/16" diameter galvanized stranded cable. Cable will be shipped loose for field installation. Cable shall run the length of pole attaching to the top of the platform to allow climber to enter platform prior to disengaging safety harness.
     
  10. (Optional) Safety harness and quick stop assembly.

Handling and Erection

  1. Prestressed concrete poles shall be lifted and supported during manufacturing, stockpiling, transporting and erection operations only at the points shown on the shop drawings.
     
  2. Transportation, site handling, and erection shall be performed with acceptable equipment and methods, and by qualified personnel.