MIL-HDBK-1005/6
See Table 1 for procedures.
3.13
Design Procedure.
See Table 2 for example.
3.14
Sample Curve Computation.
See Table 3 for
3.15
Tabulation of Sample Curve Computation.
tabulation.
The following considerations are essential to
3.16
Drydock Head-End.
design:
a) Access connections shall not be made to a continuous circular
curve connecting both sides of a drydock. In extreme cases where such
connections are absolutely necessary, prior NAVFACENGCOM approval shall be
obtained.
b) The head-end curve is a special case of a complete curve
combination (see paragraph 3.8, preceding, for description) in which a curve
having a 180-degree central angle is required to connect two parallel tangent
tracks.
c) Where feasible, the design shall be such that the curve
combination is symmetrical about a line equidistant between the parallel
tangent tracks.
The following considerations are essential to
3.17
Vertical Alignment.
design:
a) Design horizontal curves for level grade in order to minimize
the possibility of derailment, with the attendant danger of overturning.
b) If there is an absolute necessity to use other than a level
grade for a horizontal curve, approval must be obtained from NAVFACENGCOM
Headquarters.
c) Limited grades (maximum 1 percent) and vertical curves, shall
be placed on tangent track only when it is necessary to connect parts of a
track system constructed at different elevations.
d) Nonlevel grade shall be a minimum distance of the crane length
(centerline to centerline of end wheels) from the commencement of any
crossing, horizontal curve, or turnout.
e) When nonlevel grade is permitted by NAVFACENGCOM Headquarters,
use the formulas and procedure of the example in paragraph 3.17.1, following,
in determining vertical alignment.
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