Outrigger Scaffolds
An outrigger scaffold is a supported scaffold consisting of a platform supported by outrigger beams (thrustouts) projecting beyond the wall or face of a building or structure with the inboard ends secured inside the building or structure.
When inspecting outrigger scaffolds, check the following:
- Make sure outrigger beams are:
- secured in place to prevent movement
- securely braced at the fulcrum point to prevent tipping
- Make sure the inboard end of outrigger beams are:
- not less than 1½ times the length of the outboard end, measured from the fulcrum point to the extreme anchorage point
- securely anchored either by:
- braced struts bearing against sills in contact with the overhead beams or ceiling
- tension members secured to the floor joists underfoot
- both braced struts or tension members
- Check that the fulcrum point of outrigger beams rest on secure bearings at least 6 inches in each horizontal dimension.
- If outrigger beams are fabricated in the shape of an I-beam or channel beam, make sure they are placed so that the web section is vertical.
- Make sure the entire supporting structure is securely braced to prevent any horizontal movement.
- To prevent their displacement, make sure platform units are:
- nailed
- bolted
- otherwise secured to outriggers
- Verify scaffolds and scaffold components are:
- designed by a registered professional engineer
- constructed and loaded in accordance with that design
Knowledge Check Choose the best answer for the question.
4-3. When inspecting outrigger scaffolds, the outrigger beams should be _____.
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