MIL-DTL-29229B(YD)
3. REQUIREMENTS
3.1 Description. Track fittings shall be as specified herein and shown on NAVFAC drawings
1403331 and 1404035 through 1404041. The equipment specified herein are specially designed
items intended for specific application to portal crane tracks. Examples of various applications of
equipment covered by this document are shown in figure 1.
3.1.1 Double tongue track switch. The double tongue switch consists of a fabricated steel switch
bed supporting a fabricated steel switch tongue with two rails. These provide a flangeway on
both the gage side and the field side of the running rails, in either operating position. The switch
tongue shall be curved for turnout to the right for class A, or to the left for class B (see 1.2). The
double tongue switch shall be constructed to provide adequate drainage to prevent ponding of
rainwater. Additional options for track switches are listed in table I and depicted on NAVFAC
drawings 1404035 and 1404037.
TABLE I. Options for double tongue track switch (see 6.2).
Option
Choose
Choose
Description
Number
one
one
1
A
With stub rails.
a
Field rails bolted to stub rails (see figure 2).
b
Field rails welded to stub rails (see figure 3).
B
Without stub rails.
a
Field rails connected to switch base plate using rail clips (see
figure 4).
b
Field rails welded to switch base plate (see figure 5).
2
A
Cover plates bolted in place.
B
Cover plates hinged to switch.
3.1.2 Rigid frogs. The rigid frogs are fabricated as shown in NAVFAC drawings 1403331,
1404038, and 1404039. Class A is designed with two double flangeways for the intersection of
two crane rails. Class B is designed with a double flangeway for one rail and a single flangeway
for the other. This accommodates the intersection of a crane rail with a standard gage railroad
rail. Additional options for rigid frogs are listed in table II and depicted on applicable drawings.
3.1.3 Half-crossing. The half-crossing shall be class E, F, G, or H as specified (see 1.2 and
6.1.2). Half-crossings are shown on NAVFAC drawings 1403331, 1404038, and 1404039.
Examples of half-crossing configurations are shown in figure 1. Options listed in table II apply to
the frogs used to construct a half-crossing.
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