shock-absorbing allows the manufacturer to choose.
Rubberlike materials are not acceptable as an option.
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Crane runways and bridge girders shall be fitted with structural steel end
stops. Bridge end trucks and trolley frames shall be fitted with
shock-absorbing, [spring] [or] [hydraulic] type bumpers capable of
decelerating and stopping the bridge and/or trolley within the limits
stated by OSHA and MHI CMAA. Trolley end stops shall be of sufficient
strength to withstand the impact of a fully loaded trolley moving at 50
percent of maximum rated travel speed. When two bridge cranes are on the
same runway, one crane shall be fitted with shock-absorbing bumpers on each
end of each end-truck, and the other crane shall have shock-absorbing
bumpers as per above on one end only of each end-truck which is the
opposite end of the adjacent crane. The other end of the end-truck shall
be fitted with a structural steel stop to engage the bumpers of the
adjacent crane. Bridge bumper stops shall be provided as specified in
Section 05120 STRUCTURAL STEEL. Stops shall be located to permit maximum
[bridge] [gantry] and trolley travel.
2.2.8
Footwalks
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NOTE: Delete the following paragraph if
double-girder cranes are not required. Footwalk
fall protection shall be provided with guard rails
or static line with safety belts.
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The location and construction of footwalks shall be in accordance with ASME
B30.2. A full-length structural platform is required on the driver's side
of the bridge. The platform shall be checkered steel flooring, double
member handrail and a suitable toe-guard, with 760 mm 30 inch clearance in
front of control equipment. Minimum 380 mm 15 inch clearance is required
in front of bridge machinery. [To give access to the opposite side of the
trolley, [bridge] [gantry] conductors, or other equipment, a footwalk twice
the length of the trolley, shall be mounted on the opposite side of the
crane. A cross-over footwalk shall be provided over an end tie between the
two girder footwalks.] The drive side footwalk shall mate with the crane
access platform. The length of the drive side footwalk shall be [adequate
to provide access to the trolley and provide sufficient room for mounting
control cabinets][along the entire length of the [bridge][gantry]]. Safety
handrails shall be provided for footwalks.
2.2.9
Runway Rails
The runway rail size shall be as recommended by crane manufacturer.
2.2.10
Operator's Cab
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NOTE: Applicable if a cab is specified, otherwise
delete paragraph. Specify enclosed cab for outdoor
use. Open cab may be used indoors. Enclosed cabs
can be provided with a heating and/or air
conditioning unit according to environmental
conditions. Specify the location of cab and the
direction the operator should face.
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SECTION 14630A
Page 19
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