Impact Pads

[_____] 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.

Shore hardness:

[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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