(r) Catenary

Catenary scaffolds.

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(1) No more than one platform shall be placed between consecutive vertical pickups, and no more than two platforms shall be used on a catenary scaffold.

(2) Platforms supported by wire ropes shall have hook-shaped stops on each end of the platforms to prevent them from slipping off the wire ropes. These hooks shall be so placed that they will prevent the platform from falling if one of the horizontal wire ropes breaks.

(3) Wire ropes shall not be tightened to the extent that the application of a scaffold load will overstress them.

(4) Wire ropes shall be continuous and without splices between anchors.

Specific Training:

  • Catenary scaffolds may not have
    • More than one platform between consecutive vertical pickups.
    • More than two platforms altogether.
  • Platforms supported by wire rope must have hook-shaped stops on each of the platform to prevent them from slipping off the wire ropes. These hooks must be positioned so that they prevent the platform from falling if one of the horizontal wire ropes breaks.
  • Wire ropes must not be over-tightened to the point that a scaffold load will overstress them.
  • Wire ropes must be continuous and without splices between anchors.
  • Each employee on a catenary scaffold must be protected by a personal fall-arrest system.