MANUFACTURING AND QUALITY ASSURANCE - Prestressed Concrete Transmission Pole Structures - page 77

or polygon shaped sections can be either solid or made hollow by the use
of retractable mandrels or fi ber tube voids. Solid poles can have a wire
raceway provided by a plastic tube extending through the center. Although
not as dense as spun concrete (dry unit weight of approximately 145 to
150 pcf), statically cast poles also can achieve high compressive cylinder
strengths. Considering the more porous quality of the concrete, the con-
crete cover requirements of static-cast poles should be greater than for
spun-cast concrete poles. The requirements of PCI (1999) should apply.

Materials

The specifi cation should include the requirement for review and agree-
ment on the Manufacturer's materials specifi cations, sources of supply,
material identifi cation, storage, traceability procedures, and acceptance of
certifi ed material test reports.
The Manufacturer should maintain records of mill certifi cations and
test reports from material suppliers to show that all materials used
conform to applicable ASTM specifi cations. Tests on the concrete mix
should be maintained, whether these tests are performed by independent
laboratories or by the Manufacturer. In either case, these tests should be
conducted in accordance with ASTM procedures.

Manufacturing Tolerances

Spun-Cast Pole Tolerances: Product tolerances (see Fig. 7-2) are to be

limited to the following:

Fig. 7-2. Pole fabrication inspection
Source: Photograph courtesy of Valmont Newmark. Reproduced with permission.