and 100 and 200 mm 4 and 8 inch below dock level by means of double
structural steel safety legs. Safety legs shall not be deactivated by dock
leveler. This ensures that safety legs are independent of dock leveler
motion and retractable from the top of the platform for below dock level
control.
2.1.5.3
Air Powered System
When in use, and the dock leveler is above the dock, an automatic safety
device shall be provided to prevent a drop of more than 50 mm 2 inch at the
outer end of the board, should a truck or trailer be moved away leaving the
board unsupported. When in use, and the dock leveler is below dock, the
dock leveler will drop to the below dock stops, at the outer end of the
board, should a truck or trailer be moved away leaving the board
unsupported.
2.1.5.4
Dock Bumpers
Provide ramp and load dock face with laminated rubber, tire-fabric, or
equivalent dock bumpers recommended by the dock leveler manufacturer.
2.1.6
Rated Capacity
Minimum 9070 kilograms 20,000 pounds roll over capacity.
2.1.7
Ramp Load Carrying Surface
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NOTE: Board width should be up to maximum leveler
width of 2135 mm (7 foot) nominal. Board length
must be sized based on the maximum operating slopes
of the loading equipment used. Manufacturer's
literature must be checked to verify that desired
length of boards are available. Pallet, skid, and
electric fork trucks should not be required to
negotiate greater than 10 percent grade. Gasoline
fork trucks should not be required to negotiate
greater than 15 percent grade. EXAMPLE:
Given:
Height differential (dock to truck bed): 300 mm (12
inch)
Dock leveler nominal overall length: 2400 mm (96
inch)
Required:
Check for use of electric fork truck.
Grade Calculation:
Percent grade equals height differential divided by
overall leveler length times 100 which equals 300 mm
(12 inch) divided by 2400 mm (96 inch) times 100
which equals 12.5 percent.
Conclusion:
SECTION 11161
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