MIL-HDBK-1005/6
Section 9:
TRACKAGE IN PAVEMENT
See Section 8.
9.1
Highway Grade Crossing.
Specifications. Trackage in pavement shall be avoided where
9.2
practicable. Where unavoidable it should be built as follows: for light to
medium traffic conditions the track can be in flexible pavement (ballast,
timber ties, and bituminous pavement); and for heavier applications rails set
in a rigid pavement should be used. New 115 RE or heavier rails shall be used
in all pavement installations. Welded rails should be used through heavily
used crossings.
Bituminous Pavement. Provide 7 by 9 inches by 8 feet 6 inch
9.2.1
creosoted cross ties on 19 1/2-inch centers. Provide a minimum of 12 inches
of well compacted ballast below the ties and in the tie cribs (space between
the ties). Care shall be taken to maintain uniform bearing throughout the
length of each tie. The bituminous paving material shall be applied in
multiple layers with a 2 1/2 to 3-inch wide by 2-inch minimum deep flangeway
formed on the gage side of each rail.
Concrete Pavement. For new construction or major rehabilitation
9.2.2
track constructed in concrete pavement should be built according to the
details in Figure 1, Railroad Track Support. Flangeways shall be 2 1/2 to 3-
inch wide by 2-inch minimum deep on the gage side of each rail. A gage rod
may be substituted for the 3/4-inch diameter tie rod shown in Figure 1. See
NAVFAC MIL-HDBK-1025/1, Piers and Wharves for additional information.
Turnouts. Switches or frogs should not be installed in paved
9.3
areas. Where unavoidable, use tongue and mate switches as per AREA Portfolio
of Trackwork Plans.
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