standard gage (railroad) tracks. The cranes for
this system are equipped with single-flanged wheels.
Switches and frogs are of the standard railroad
type except for some small frog angles, where
turntable frogs may be required. For details of
two- and four-rail system applications, see
MIL-HDBK-1005/6. This guide specification may be
used for either two-rail or four-rail crane track
systems by deletion of inapplicable paragraphs
describing the use of specific types of switches and
frogs. For four-rail systems, additional references
based on Section 05650, "Railroad Track and
Accessories" for Standard Gage Railroad Track may be
used.
2. Two-Rail System: The cranes for this system are
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 double-flanged wheels shall be
special fittings meeting the following requirements:
2.2.2.1
Cast Manganese Steel Double-Tongue Switch Points
**************************************************************************
NOTE: If deviation from the military specification
is necessary, include the phrase, "except as
specified in paragraph entitled "_____." Either
specify the deviations in the appropriate paragraph
or list together in a new paragraph.
**************************************************************************
MIL-DTL-82020 [, except as specified in paragraph [_____],] for use with
double-flanged wheels. Manganese steel castings shall conform to ASTM A
128/A 128M. [Provide double-tongue switch points with rail curvature
geometry indicated. Variations will not be accepted.] [Confirm switch
point dimensions by preparation of full-size patterns before molds for
castings are made.] [Provide switch points for use in a single crane track
turnout in matched pairs.]
2.2.2.2
Cast Manganese Steel Rigid Ramp-Type Frogs
**************************************************************************
NOTE: If deviation from the military specification
is necessary, include the phrase, "except as
specified in paragraph entitled "_____." Either
specify the deviations in the appropriate paragraph
or list together in a new paragraph.
**************************************************************************
MIL-DTL-82020 [, except as specified in paragraph [_____],] for use with
double-flanged crane [and railroad] wheels. Manganese steel castings shall
conform to ASTM A 128/A 128M. [Provide rigid frogs with frog angle and
rail curvature geometry indicated. Variations will not be accepted.] [Cast
half-crossings at the intersection of a crane rail and a standard gage
railroad track as an integral one- or two-piece unit.]
SECTION 14606N
Page 16
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