or want rails or bars).
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Trolley runway rails, crane girders and other sections shall be straight
and true. When loaded with motor driven cranes the deflection of rails
shall not exceed 1/800 of the span. The deflection shall be calculated
with the worst case of two loaded bridge cranes located adjacent each
other. Rail joints shall be flush and true without misalignment of running
tread and shall be designed to minimize vibration. The gap between
adjacent rail ends and the vertical misalignment of running treads shall
not exceed 1.588 mm 0.0625 inch. The bridge rail shall be leveled to a
plus-or-minus 3 mm 1/8 inch at all rail support joints. Bridge rail shall
be fastened to [top cover plate] [wide flange] or centered on flange or
offset near web plate for welded box sections, complete with welded clips.
Bridge rail joints shall be bolted using standard joint bars. Rail joints
shall be staggered. A positive stop shall be provided at bridge rail ends
to prevent creep.
2.2.4
End Ties and [Bridge] [Gantry] Girder End Connections
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NOTE: Specify end ties for cranes with more than 4
wheels. Specify welded structural steel box
sections for multiple-girder cranes Class C, D, or E
with a capacity greater than 18 metric tons (20
tons) or a span greater than 12 m (40 feet).
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Welded steel box sections shall be used for end ties, full depth diaphragms
shall be provided at girder connections and jacking points. Horizontal
gusset plates shall be provided at the elevation of top and bottom end tie
flanges for connection to girder ends. End connections shall be made with
high-strength bolts. Body-bound bolts fitted in drilled and reamed holes
shall be used to maintain the crane square.
2.2.5
Bridge End Trucks
End trucks shall be the rotating or fixed axle type fabricated of
structural tubes or from structural steel to provide a rigid box section
structure. Jacking pads shall be provided for removal of wheel assemblies.
2.2.6
Trolley Frame
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NOTE: Trolley frame is applicable only to multiple
girder cranes.
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Trolley frame shall consist of two structural steel side frames or trucks
welded together with one or more structural steel load girts to form a
one-piece unit. Pads shall be provided for the use of jacks or wedges when
changing truck wheels. All trolley yokes and load bars shall be of drop
forged, cast or rolled steel.
2.2.7
Stops and Bumpers
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NOTE: Rubber bumpers dry out with time. Hydraulic
type bumpers are more expensive. Using the words
SECTION 14630A
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