Mich. Admin. Code R. 408.11833 - Bridge bumpers; trolley bumpers; rail sweeps
Rule 1833.
(1)
A crane shall be provided with bumpers or other automatic means providing
equivalent effect, unless the crane travels at a slow rate of speed and has a
faster deceleration rate due to the use of sleeve bearings, is not operated
near the ends of bridge and trolley travel, is restricted to a limited distance
by the nature of the crane operation and there is no hazard of striking any
object in the limited distance, or is used in similar operating conditions. The
bumpers shall be capable of stopping the crane, not including the lifted load,
at an average rate of deceleration of not more than 3 feet/s/s (per second, per
second) when traveling in either direction at 20% of the rated load speed.
Bumpers shall meet both of the following requirements:
(a) A bumper shall have sufficient
energy-absorbing capacity to stop the crane when traveling at a speed of not
less than 40% of rated load speed.
(b) A bumper shall be mounted so that there
is no direct shear on bolts.
(2) Bumpers shall be designed and installed
to minimize parts falling from the crane in case of breakage.
(3) A trolley shall be provided with bumpers
or other automatic means of equivalent effect, unless the trolley travels at a
slow rate of speed, is not operated near the ends of bridge and trolley travel,
is restricted to a limited distance of the runway and there is no hazard of
striking any object in the limited distance, or is used in similar operating
conditions. The bumpers shall be capable of stopping the trolley, not including
the lifted load, at an average rate of deceleration of not more than 4.7
feet/s/s (per second, per second) when traveling in either direction at 1/3 of
the rated load speed. Trolley bumpers shall meet both of the following
requirements:
(a) When more than 1 trolley is
operated on the same bridge, each shall be equipped with bumpers or equivalent
on their adjacent ends.
(b) Bumpers
or equivalent shall be designed and installed to minimize parts falling from
the trolley in case of broken or loosened mounting connections.
(4) Bridge trucks shall be
equipped with rail sweeps that extend below the top of the rail and project in
front of the truck wheels.
Notes
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