Cal. Code Regs. Tit. 8, § 1664 - Needle-Beam Scaffold
(a)
Needle-beam scaffolds shall be designed with a factor of safety of at least 4,
to support the loads to be imposed, but in no case shall the strength or
quality be less than required by the following specifications. (See B-37,
Appendix)
(1) Wood needle beams shall be not
less than 4 inches by 6 inches in cross section, if the distance between
supports does not exceed 10 feet. Larger beams are required for spans in excess
of 10 feet, and in all cases they shall be placed with the greater dimension
vertical. They shall be "selected lumber," or equivalent, straight-grained, and
free of knots or other defects. Other materials or types may be used if of
equivalent strength and rigidity.
(2) Wood needle beams shall be made from one
piece of material without splices or laminated joints. Laminated wood beams,
manufactured of good quality, glued members, subjected to proper bonding
pressure, may along with other materials be used if of equivalent
strength.
(3) Wood needle beams
shall not be painted in such a manner as to hide the grain structure. They may
be coated with linseed oil or other transparent coating.
(4) Ropes used for the support of needle
beams shall be not less than 1 ¼ -inch diameter Manila rope, or
equivalent, free from flaws, deterioration, chemical damage, or other
imperfections. C-clamps or open hooks shall not be used for support of needle
beams or needle-beam ropes.
(5) The
ropes shall be attached to the needle beams by a scaffold hitch, or some other
equally effective method, at a point not less than 1 foot from the end of the
beam. Ropes shall be so secured to the beams or girders as to prevent tipping
or slipping of either the beam or the scaffold. When the rope attachment is
within 2 feet of beam end, bolt or cleat shall be attached or other means taken
to prevent rope from coming off beam.
(6) Planks making up platforms on needle
beams shall not be less than 2 inches by 10 inches and not have more than a 10
foot span. All planks shall be secured by suitable cleats or drop bolts to
prevent slipping, tipping, or collapsing, with special attention for those
planks that are on the beam overhang outside the rope attachment. When planks
are in an inclined position of 5 percent or more, they shall be provided with
cleats on the working surface at least 1 ¾ inches by 2 inches in cross
section, spaced not more than 16 inches apart.
(7) Platforms used for riveting or other work
requiring similar tools shall be not less than 36 inches wide when used on
exterior of structures, and not less than 30 inches wide for interior
work.
(8) Needle-beam platforms
that are used for rivet heaters shall be not less than 6 feet wide and 10 feet
long, with planks laid close together, and some provision shall be made to
prevent materials or tools from rolling off edges.
(9) Where the supports for needle beams are
fixed members rather than suspension ropes, positive means shall be taken to
prevent the beams from turning or rotating to a position where the strength is
reduced.
(10) All unattached tools,
bolts, and nuts used on needle beam scaffolds shall be kept in suitable
containers, properly secured.
(11)
If one end of a needle beam scaffold platform rests on a permanent structural
section, all applicable sections of this Article and Article 23 shall be
observed.
(12) Each employee
working on a needle beam scaffold shall be provided with and use personal fall
protection in accordance with the requirements of Article 24 or by a safety net
rigged as provided in Section
1671.
Notes
2. Amendment of subsection (a)(12) filed 7-2-98; operative 8-1-98 (Register 98, No. 27).
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.
2. Amendment of subsection (a)(12) filed 7-2-98; operative 8-1-98 (Register 98, No. 27).
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