Civil Engineering Reference
In-Depth Information
4.4.2.3 Guyed structures are plumb: All guyed structures are
assumed to be plumb (no vertical eccentricity in the longitudinal
centerline of the pole) when installed and in service.
5. PHYSICAL CHARACTERISTICS
5.1 Shape and Size
All poles shall be circular or polygonal in cross section and shall have
a uniform outside taper not greater than 0.216 in. per ft. Unless shown
otherwise on the drawings or load tables, all structures shall have a
minimum of a 2-1/2 in. wall thickness at the pole tip.
5.2 Void and End Treatment
The pole shall contain a void designed to be consistent with the strength
requirements and weight reduction.
Both the top and bottom ends of the pole shall be plugged with an
epoxy-grout or nonshrink dry-packed concrete mix. The plug shall be a
minimum of 12 in. thick except that the tip plug need not exceed the
distance to the fi rst through hole or 6 in., whichever is the least distance.
The prestressed steel strands at both ends of the pole shall be burned back
at least 1 in. into the concrete, and the slag and carbon shall be cleaned
off prior to the plugging of the resulting hole with an epoxy-grout mix. A
metal pole cap, suitably fastened to prevent removal, may be used at the
pole tip in lieu of plugging the void and burning the strand. If a pole tip
cap is used, the strand shall be cut fl ush with the tip surface and the ends
cleaned and coated with an epoxy.
The bottom pole plug will have a 2-in. diameter hole through the entire
thickness of the plug to allow ground water to escape from the interior
void of the pole. When specifi ed, some Purchasers may require the pole
bottom to be left open.
5.3 Finish
The pole shall have a smooth, uniform natural concrete fi nish with no
cracks. Sharp edges shall be tooled to smooth. The outside surface along
the length of the structure shall be troweled until all projections, depres-
sions, and irregularities have been removed and the entire surface has a
smooth texture.
All small cavities caused by air bubbles, honeycomb, or other small
voids shall be cleaned, saturated with water, and then carefully painted
with mortar. A small cavity is defi ned as one not larger than 1/2 in. in
diameter nor deeper than 1/4 in. Large cavities not exceeding 2 in. long
shall be repaired by opening the cavity sides on a 1 to 1 slope with a
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