[_____] kg [_____] pounds. Provide rail clips designed to allow rail
removal without the removal of the welded portion of the rail clip.
][2.1.6
Impact Pads
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NOTE: Use impact pads where there will be a large
number of crane movements or where vibration could
cause excessive wear on the crane or rail.
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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.
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Provide impact pads sized for [135-CR] [_____] crane rail section. The
pads shall be impervious to water, oil, fuels, grease and ultraviolet rays.
Pads shall have reinforcing vulcanized to and encapsulated in synthetic
rubber. The required properties are:
a.
[75 to 85] [_____ to _____] degrees
b.
Thickness (minimum):
[6] [_____] mm ([1/4][_____] inch) [1/4]
[_____] inch
c.
Ultimate tensile strength (minimum): [17] [_____] MPa
([2500][_____] pounds per square inch) [2500] [_____] pounds per
square inch
d.
Reduction in load per square mm inch (minimum): [30] [_____]
percent
e.
Temperature range: Minus 7 to 100 degrees C (20 to 212 degrees F)
20 to 212 degrees F
f.
Wheel Load:
[_____] kg [_____] pounds
g.
Crane rail bending stress (maximum): 75 percent of allowable
bending
The pads shall meet the required properties for a minimum of 1,000,000
wheel passes at the maximum permissible wheel load.
]2.1.7
Electrodes
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NOTE: Welded rail joints are preferred for crane
rail except at connections between rail and rail
fittings such as switches and frogs where bolted
SECTION 14606N
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