equipped with double-flanged wheels. Special
double-tongue switchpoints and ramp-type frogs are
required for this system. Turntable frogs may also
be required for small frog angles.
**************************************************************************
Crane track switches and frogs for use with single-flanged wheels shall
conform to applicable requirements of the AREMA Manual and AREMA Track Plans,
with the following limitations:
**************************************************************************
NOTE: All references in this section to rail
section specify per yard (135-CR) crane rail. The
135-CR section is the most common for new and
replacement portal crane track. In some work, rail
sections other than 135-CR may be required for crane
use. These include heavier rail section or, for
connection to older existing installations, use of
60 kilogram (132 pound) 132 pound or other railroad
rail may be specified. Make changes where rail
sections are required that are different than the
135-CR.
**************************************************************************
a.
Provide fittings for use with [135-CR] [_____] crane rail section.
[b.
Provide turntable frogs.]
2.2.2
Two-Rail Portal Crane Track Systems
**************************************************************************
NOTE: Welded rail joints are preferred for crane
rail except at connections between rail and rail
fittings such as switches and frogs where bolted
joints are recommended. The project drawings shall
indicate each joint type (bolted and/or welded).
Welded connections between carbon steel rail and
rail fittings fabricated from carbon steel, if
desired, may be accomplished using either of the
methods identified in paragraph "Welded Crane Rail
Joints." The designer shall determine the welding
method(s) to be used and project drawings shall show
location of each welding method. Welded connections
between carbon steel rail and cast manganese steel
are not recommended. However, if the activity
requires a dissimilar metal welded connection such
as this, the cast manganese stub rail end section
should be prepared for welding in accordance with
Sketch 14606-1. The manual shielded arc welding
method in accordance with paragraph "Manual
Shielded-arc Welding Method" and electrodes in
accordance with paragraph "Electrodes" should be
used. Thermite method is not acceptable for welding
dissimilar metal.
There are two types of portal crane trackage systems
in use in the Naval Shore Establishment:
1.
Four-Rail System:
This system consists of two
SECTION 14606N
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