2.6.3
Prestressing Steel
Seven-wire stress-relieved strand conforming to ASTM A 416/A 416Mor
stress-relieved wire conforming to ASTM A 421, Type WA. The minimum
ultimate strength shall be 1750 MPa 250,000 psi. Prestressing steel shall
be free from grease, oil, wax, paint, soil, dirt, loose rust, kinks, bends,
or other defects.
PART 3
EXECUTION
3.1
PREPARATION
Prior to installation of poles, check for damage, such as cracking,
spalling, and honeycombing. Reject members which contain honeycombed
sections deep enough to expose reinforcing steel. Reject structurally
impaired prestressed members. Provide a PCI MNL-116 commercial grade
finish.
3.2
INSTALLATION
3.2.1
Pole Placement
**************************************************************************
NOTE: Select the placement methods which are
permitted for the project. Delete those that are
not allowed.
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[3.2.1.1
Driving Poles
Drive at the hammer manufacturer's rated speed and without interruption to
the indicated tip elevation. Pile hammer shall be air, steam, or diesel
powered, with a capacity at least equal to the hammer manufacturer's
recommendation for total weight of the pole and character of subsurface
material to be encountered. Position a pile cap or drive cap between the
pole and hammer. Place hammer cushion or cap block between the ram and the
cap or drive cap.
][3.2.1.2
Augering
Poles shall be set in augered holes with a diameter [150 mm] [_____] [6
inches] [_____] larger than the concrete pole. Fill augered hole around
pole with air-entrained concrete having a minimum compressive strength of
20 MPa 3000 psi at 28 days and finish in a dome. Cure concrete a minimum
of 72 hours before performing further work on poles.
][3.2.1.3
Pole Foundation
Provide as indicated, with a cast-in-place dowel. Insert dowel into dowel
pocket in bottom of pole and plumb pole. Backfill around pole with
backfill and fill materials as specified in Section 02300 EXCAVATION.
Provide concrete under this section as specified in Section 03300N
CAST-IN-PLACE CONCRETE.
]3.3
EXCAVATING, BACKFILLING, AND COMPACTING
Provide as specified in Section 02300 EXCAVATION.
SECTION 02588
Page 8