2006 New York Code - Two-point Suspension Scaffolds.

 
    §  27-1046  Two-point  suspension  scaffolds.  (a)  Width and support.
  Two-point suspension platforms shall be at least twenty inches  but  not
  more  than  thirty  inches  in  width. Each end of the platform shall be
  supported by an approved stirrup or hanger, and the  platform  shall  be
  securely  fastened  thereto. Not more than two hangers or stirrups shall
  be used to support one scaffold.
    (b) Hangers. Hangers or stirrups shall be of steel  or  wrought  iron.
  Each such hanger shall be formed to properly fit the platform, and shall
  be  provided  with  a loop or eye at the top for securing the supporting
  hook on the block, and with loops or equivalent means to support the top
  rail and midrail. The hanger or stirrup shall be  placed  at  least  six
  inches but not more than eighteen inches from the end of the platform.
    (c)  Roof irons. Roof irons or hooks shall be of steel or wrought iron
  not less than seven-eighths of an inch in  diameter  or  other  size  of
  equivalent  strength  and  shall  be  securely anchored. Where the upper
  block hook does not directly engage the roof iron, the connection  shall
  be  made  with  wire  rope of required strength but in no case shall the
  wire rope be less than one-half inch in diameter.
    (d) Fibre rope.
    (1) The use of fibre rope shall be limited  to  light  duty  two-point
  suspension  scaffolds.  Fibre  rope  shall  be  at  least  equivalent in
  strength and suitability to three-quarter inch first  quality  unspliced
  manila rope.
    (2)  Fibre  rope shall not be permitted for or near any work involving
  the use of corrosive substances or where the upper block  is  more  than
  one hundred feet above the platform.
    (3)  All blocks shall fit the size of rope they carry, and shall be so
  constructed as not to chafe the rope.
    (e) Use.
    (1) Needle beam scaffolds shall not be used over  areas  used  by  the
  public.
    (2)  Two  or more two-point suspension scaffolds shall not be combined
  into one by bridging the  distance  between  them  or  by  any  form  of
  connection.
    (3)  Not  more  than  two  workers  shall  be permitted to work on one
  scaffold at one time.
    (4) Every two-point suspension scaffold  shall  be  equipped  with  an
  approved device to raise, lower, and hold the scaffold in position.
    (f)  Platforms.  The  platforms of every two-point suspension scaffold
  shall be one of the following types, or an approved equivalent.
    (1) LADDER TYPE  PLATFORM--consisting  of  boards  upon  a  horizontal
  ladder,  the sides of which are parallel. The ladder shall be capable of
  sustaining, without failure in any part, at least four times the maximum
  load allowed to be placed thereon, and rungs shall be at least  one  and
  one-eighth  inches  in  diameter with seven-eighths inch tenons mortised
  into the side stringers at least seven-eighths of an inch and spaced  at
  not  more  than  eighteen  inches. Stringers shall be tied together with
  metal rods at least one-quarter inch in diameter located not  more  than
  five  feet apart and which pass through the stringers and are riveted up
  tight against washers at both ends. The platform  shall  consist  of  at
  least  one-half  inch by three inch planks, shall fill the space between
  the sides of the hangers, and shall be securely fastened to the  hangers
  by  U-bolts passing around the hangers and bolted up tight on the inside
  face of the stringers.
    (2) PLANK TYPE PLATFORM--consisting of planks supported on stirrups or
  hangers. The planks shall have a  uniform  thickness  of  at  least  two
  inches  and  a width of at least nine inches. The planks shall extend at
  least six inches but not more than eighteen inches beyond the supporting


  hangers, and a bar shall be nailed across the platform on the  underside
  at  each end to prevent the platform from slipping off the hanger. Where
  two or more planks are used, they shall be fastened together  by  cleats
  not  less  than  one  inch  by  six  inches  nailed  on the underside at
  intervals of four feet or less. Planks shall not be spliced.
    (3) BEAM TYPE PLATFORM--consisting of longitudinal side stringers with
  cross beams  on  which  longitudinal  platform  planks  are  laid.  Beam
  platforms  shall  have  side stringers not less than two inches by eight
  inches. The stringers shall be supported on the hangers, located to fill
  the full width of the hangers, and the clear span between hangers  shall
  not  exceed  twenty-four feet. The ends of the stringers shall extend at
  least six inches but not more than eighteen inches beyond  the  hangers,
  and  shall  be  fastened  to  the  hangers by U-bolts passing around the
  hangers and bolted up tight on the inside face  of  the  stringers.  The
  platform  shall  be  supported  on  two inch by six inch cross beams, on
  edge, set between the  side  stringers,  securely  nailed  thereto,  and
  spaced  not  more  than  four feet on centers. The platform boards shall
  consist of material not less than one inch by six inches,  nailed  tight
  together, and extended to the outside face of the stringers. The ends of
  all  platform  boards  shall rest on the cross beams and shall be nailed
  securely thereto.
    (g) Guard rail and toeboard. The outside edge of the platform, and the
  open ends (when stirrups do not afford  adequate  protection)  shall  be
  provided  with a two-rail guard rail and a toeboard securely fastened at
  intervals not exceeding ten feet. Where there is  a  space  between  the
  scaffold and the structure greater than six inches, a similar guard rail
  shall be provided at the inside of the platform.