The angle of the ladder is usually 60 70 and the design should use the shallowest angle possible within this range.
Alternating tread device vs ships ladder.
Alternating tread stairs are preferred in many industrial and commercial applications by achieving vertical access with a shorter horizontal span than traditional stairs and greater functionality than traditional ladders.
The riser height is reduced and the run is longer than a typical ship ladder but the steps alternate.
Precision s aluminum alternating tread stair is an alternative to a traditional ships stair.
How do these devices differ from each other.
But for the purposes of this answer let s assume that the stair does have the same number of treads on both sides.
Ships ladders ship stairs ship ladder stairs alternating tread stairs fixed ladders are all terms that can get confused and sometimes used interchangeably.
Since the treads alternate this stair is not considered to be as safe as a standard ship ladder or spiral stair.
Let s look at how osha defines stairways alternating tread stairs ship stairs ship ladders and fixed ladders to understand the difference.
This stair saves space and you can go down face forward.
This is an alternating tread stair.
Available in steel.
Alternating tread ladders available in a variety of sizes.
These stairs allow the user to descend face forward giving a clear view of the floor below.
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Vertical rise between treads is generally around 9.
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Easy assembly and quick ship available.
Aluminum ship ladder with platform.
Alternating tread ladder crossover 2 alternating tread ladders connected by a platform industrial.
Aluminum crossover ships ladder footprint 2 ships ladders connected by a platform alternating tread ladder calculate space requirements at various heights and angles.
All alternating tread ladders have a 350 pound capacity.
The width of ship ladders is usually 24 and the tread depth is 6.
Duvinage custom designs and fabricates alternating tread stairs to the highest industry standards.