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From:	Roger Turk
Jeff,
>From an old Architectural Graphics Standards:  Max. slope: 1:8; Min.
length:
30'; Recommended length: 40'.  (Footnote cites info from, "The Operations
Council, American Trucking Associations, Inc.")
Remember, the dock height is going to be dependent on the slope and any
level or reverse slope that exists in the pit.  The specified dock height,
usually 4'-0" to 4'-6" would be measured from where the extended line of the
sloping ramp intersects the vertical face of the dock and would *not* be the
height of the dock at the face of the wall.
Also, the sloping ramp will cause the top of the truck to hit the wall well
before the truck bed will hit a dock bumper unless the deck projects out a
considerable distance.  Truck height is approx. 14'.
Hope this helps.
A. Roger Turk, P.E.(Structural)
Tucson, Arizona

Jeff Fertich wrote:
. > Any suggestions or rational for the slope of a pit ramp for a tractor .
> trailor loaded to a total weight of 100K of compacted paper must travel up
. > from a dead stop?


I suggest you get a copy of RITE-HITE's Dock Design Guide to address Roger
Turk's concern.(414)355-2600.  They also mention that as a general rule
grades should not exceed 10%. They indicate this is too steep if conditions
creating poor traction exist.  Motor Truck Engineering Handbook states that
to negotiate grades in excess of 5 per cent, all-wheel drive traction, a
powered dolly or the use of tractive aids are recommended.  The book also
indicates that a 40' semi with 50' overall length with 6x2 tractor drive and
gross weight of 112,500 lbs. Can negotiate a 11.2% grade with chained tires.
The book also indicates that a loaded truck can ascend a steeper ramp than
an empty truck.

Roger Davis
SDS Architects, Inc.