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Posted by on August 1, 2006, 2:57 pm
>
>>I would like to do myself a wood spiral staircase for my country house
>>(not expensive)...
>
>Take a look at:
http://www.postdiluvian.org/~mason/spiral/
>and
http://www.downers.us/pdf_files/codesrvs/VODGIRC2000.pdf
>
>"R314.5 Spiral Stairs.
> Spiral stairways are permitted, provided the minimum width shall be 26"
> (660 mm) with each tread having a 7-1/2 inch (190 mm) minimum tread width
> at 12 inches (305 mm) from the narrow edge. All treads shall be identical,
> and the rise shall be no more than 9-1/2" (241 mm). A minimum headroom of
> 6 feet, 6 inches (1982 mm) shall be provided"
>
>Getting the required headroom means that you have to go up at least 9 risers
>before you overlap the landing below, which strongly militates for 3 steps
>per quadrant, or 30 degree wedges. 11 rises and 10 treads gives you 8.73"
>rises and a landing that's a 60 degree wedge with the required headroom.
>
>The 7.5" tread-width at 12" from the inner edge means that that walk-line
>needs to be 7.5 x 12 = 90", which means that your center post pretty much
>HAS to be at least 3".
>
>... I'd give some serious thought to using black-pipe as the center-pole.
You might use 1.5" pipe with 2' 4x4 treads with a 1.5" vertical hole 4"
from one end and a 4"x1/4" horizontal bolt on each side of the hole to
squeeze the pipe. The "handrail" might be 1/8" plastic covered aircraft
cable threaded through the other ends, anchored at top and bottom, with
a turnbuckle to keep the cable tight.
Nick
It was known across the nation as "The Cook Creek Spar Tree"--the
most ingenious fire tower ever. It stood within the Quinault Indian
Reservation 9 miles southwest of Lake Quinault.
In 1927 a 179' Douglas fir 7 feet in diameter was high-topped by a
Hobi Timber Company climber using spurs and a crosscut saw. The huge
pole was then debarked with a double-bitted axe as he descended from
the top. Three-foot steel rods with an eye in one end were driven
into the tree in such a manner as to form a winding staircase with a
steel cable threaded through the 130 eyes and stretched taut with a
chain binder. The tightened cable served as a hand rail, as well as
to hold the rungs securely into the trunk. Four railroad ties were
then anchored a few feet below the top, with the 49-square foot house
assembled atop them by Paul Meyer and his two helpers. Cedar shiplap
siding finished the walls, and sliding glass windows gave the eagle's
aerie its own touch of class.
Upon nailing on the last shingle, Paul stood up on the rooftop and
hoisted the American flag. His shouts could be heard only faintly
on the ground as he declared, "I can see all the way to Hawaii." For
the next 28 years the unique fire tower stood. No one ever challenged
his statement by climbing atop that breezy roof again.
During its years of service, the Cook Creek Spar Tree became a center
of nationwide publicity. Newspapers from coast to coast ran feature
stories, and in 1929 Hollywood newsreels portrayed it as the phenomenal
one-legged skyscraper.
In 1955 the Bureau of Indian Affairs found it necessary to saw the
pole down for fear that someone might be injured climbing the decaying
attraction. Today, nothing can be found but a few rusted fragments
amid a thriving new forest in the NE1/4 of the NW1/4 of Section 26,
Township 22 North, Range 11 West.
From "Fire Lookouts of the Northwest,"
by Ray Kresek, Ye Galleon, 1984.
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