INSTRUCTIONS WHEN USING RUS GUIDE SPECIFICATIONS

FOR STANDARD CLASS SPUN, PRESTRESSED CONCRETE POLES

 

A. Purpose: *This guide specification provides a basis forprocuring direct embedded standard class spun prestressed concrete poles. Ifpoles are competitively bid, use of this specification will eliminateambiguities which might arise in the evaluation process.
Terminology used in this specification has been simplified in order toprovide consistency. Referring to the owner can also mean the owner'srepresentative or engineer.

The owner is responsible for completing this specification and adding otherinformation, drawings and supplemental requirements as appropriate. It may benecessary for the owner to modify this specification in order to considerspecial applications or preferences.
**B. Scope: This purchase specification covers the technical aspectsof design, materials, manufacturing, inspection, testing, and delivery of directembedded standard class spun prestressed concrete poles. It is recommended thatthis specification be limited to poles which are not guyed, not subjected tounbalanced lateral loads, or do not have deflection limitations or other speciallimitations. For concrete pole applications which consider these items, it isrecommended that the owner use Guide Specification for Spun, PrestressedConcrete Pole and Concrete Pole Structures, RUS Bulletin 1724E-206. Thisspecification does not include front-end documents or specifications forconstruction. The owner needs to add front-end documents including instructionsto the bidders and general conditions. This specification may be expanded toinclude H-frame structures.
**C. Initial Design Considerations: There are several engineeringdecisions required of the user of this specification to determine which standardclass concrete poles to specify. Some examples include, but are not limited to:
- Amount of foundation rotation and deflection to consider for    incorporating P-delta moments;
- Location of point of fixity;
- Embedment depths;
- Load cases to be considered in addition to those required by the National    Electrical Safety Code (NESC); and
- Deflection limitations.

Prior to the selection of a standard class pole, the user should perform theengineering required for these types of issues or employ an engineeringconsultant to do so. See Appendix A for a discussion of some of these items.
**D. Information to be Completed by the Owner - When using thesespecifications the owner should detach sheets 1a to 8a and the Commentary, andadd or complete the following:
**D.1 Documents and general information to be added to the technicalspecification: The following front-end documents and general informationneed to be added to this technical specification:
**- RUS Form 198 (Recommended for competitive bidding)
- Supplemental Instructions to Bidders
- General Conditions**
It is recommended that RUS Form 198 be used for competitive bidding. Thisform covers Notice and Instructions to Bidders, Proposal, and EquipmentContract. Other supplemental information which the owner may want to addincludes Bid Submission, Bid Price and Schedule, Bid Acceptance Period, BidRequirements, Bid Data, and Bidder's Qualifications. A section on GeneralConditions could include such items as Definition of Terms, Inspection andAcceptance, Interpretation of Bid Documents, Addenda to the Bid Documents,Insurance, Method of Payment (if Form 198 is not used), Quantities, andTabulation of Unit Prices.
**D.2 Specifications and technical information to be completed by theOwner:

a. Configuration requirements and other information (Attachment A of thespecification or equivalent):

(1) Structure dimensions;

(2) Conductor support (type, holes, orientation and height);

(3) OHGW support (type, holes, orientation and height);

(4) Underbuild support (type, holes, orientation and height);

(5) Embedment depths; and

(6) Other hole locations and/or requirements.
**b. Strength requirements - Standard class designations for spun concretepoles, which include ultimate loading and ultimate strength requirements.

This specification establishes standard concrete pole sizes. The appropriate standard class pole from Section 4 needs to beselected by the engineer.

In the calculations to select the standard class pole, the engineer shoulduse minimum design loads which meet NESC requirements appropriate for theloading district, any local codes, the NESC extreme wind load provisions, andany necessary extreme ice and wind conditions with the appropriate overloadfactors. The design loads account for all loading cases including wind on poleand secondary stresses from foundation deflection and rotation, and fromvertical loads acting on lateral pole deflection (P-delta effect).

ASCE Guidelines for Transmission Line Structural Loading can be used fordeveloping loads produced by climate, accidents, construction and maintenance.Calculations need to include the vertical, transverse, and longitudinal loadswith wind on the structure and the dead weight of the structure for any givenloading condition applied simultaneously.
**c. Application Requirements (Attachment B to be completed by the Owner).**
(1) Location of climbing and/or working devices and the quantity of each tobe supplied with the poles.

(2) Delivery schedule, F.O.B. location, and name, address, and telephonenumber of the owner's contact.

(3) Additional requirements. Additional items such as special pole color(stain, paint, or dye additive), location of bolt holes for other attachmentrequirements, grounding requirements, cant holes, switch operating mechanisms,etc.

(4) Pole tests required.
**E. Information to be Completed by the Manufacturer
E.1 The owner should have the following information completed and submittedby each bidder (Attachment C or equivalent).

a. Calculated weight of each concrete pole;

b. For each standard class pole ultimate loading, provide section and        strength properties, including the ultimate, cracking and zero tension        moments and deflections, at maximum five foot intervals along the pole;

c. Pole diameter at top, bottom, and groundline;

d. Tip and butt wall thickness;

e. Prestress strand - quantity, size and dropout location;

f. 28-day compressive strength of concrete; and

g. Diameter taper (in/ft).
**E.2 The owner should have the following information completed by thesuccessful bidder prior to pole manufacture:**
a. Type of material of major components (ASTM number and grade);

b. Quantity, size and grade of prestressing strands or other        reinforcement;

c. Description of pole including thickness, length, diameter, and        taper; and

d. Design exceptions.
**E.3 Test reports as requested by the owner.*****************