Quantcast Pole Scaffold Construction

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Swing scaffolds should be suspended by wire or fiber  line  secured  to  the  outrigger  beams,  A  minimum safety  factor  of  6  is  required  for  suspension  ropes, The  blocks  for  fiber  ropes  should  be  the  standard 6-inch  size  consisting  of  at  least  one  double  block  and one single block. The sheaves of all blocks should fit the  size  of  rope  used. The outrigger beams should be spaced no more than  the  hanger  spacing  and  should  be  constructed  of no  less  than  2-by-10  lumber.  The  beam  should  not extend  more  than  6  feet  beyond  the  face  of  the building.  The  inboard  side  should  be  9  feet  beyond the  edge  of  the  building  and  should  be  securely fastened to the building. Figure 4-43 shows a swinging scaffold that can be used for heavy work with block and tackle. POLE SCAFFOLD CONSTRUCTION The poles on a job-built pole scaffold should not exceed 60 feet in height. If higher poles are required, the  scaffolding  must  be  designed  by  an  engineer. All poles must be setup perfectly plumb. The lower ends of poles must not bear directly on  a  natural  earth  surface.  If  the  surface  is earth, a board footing 2-inches thick and 6- to 12-inches wide (depending on the softness of the earth) must be placed under the poles. If poles must be spliced, splice plates must not be less than 4-feet long, not less than the width of the pole wide, and each pair of plates must have  a  combined  thickness  not  less  than  the thickness of the pole. Adjacent poles must not be spliced at the same level. A ledger must be long enough to extend over two pole spaces, and it must overlap the poles at the ends by at least 4 inches. Ledgers must be  spliced  by  overlapping  and  nailing  at poles—never  between  poles.  If  platform planks are raised as work progresses upward, the  ledgers  and  logs  on  which  the  planks previously  rested  must  be  left  in  place  to  brace and   stiffen   the   poles.   For   a   heavy-duty scaffold, ledgers must be supported by cleats, nailed  or  bolted  to  the  poles,  as  well  as  by being  nailed  themselves  to  the  poles. A single log must be set with the longer section dimension  vertical,  and  logs  must  be  long Figure 4-43.—Swinging scaffold. enough to overlap the poles by at least 3 inches. They  should  be  both  face  nailed  to  the  poles and toenailed to the ledgers. When the inner end of the log butts against the wall (as it does in a single-pole scaffold), it must be supported by  a  2-by-6-inch  bearing  block,  not  less  than 12 inches long, notched out the width of the log and securely nailed to the wall. The inner end of the log should be nailed to both the bearing block and the wall. If the inner end of a log is located  in  a  window  opening,  it  must  be supported on a stout plank nailed across the opening. If the inner end of a log is nailed to a building stud, it must be supported on a cleat, the same thickness as the log, and nailed to the stud. A  platform  plank  must  never  be  less  than 2-inches  thick.  Edges  of  planks  should  be close   enough   together   to   prevent   tools   or materials from falling through the opening. A plank must be long enough to extend over three logs, with an overlap of at least 6 inches, but not more than 12 inches. PREFABRICATED SCAFFOLD ERECTION Several  types  of  scaffolding  are  available  for simple and rapid erection, one of which is shown in 4-27



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