A half-horse or lean-to scaffold is so called because the inner end of the bearer is supported by leaning against the wall. Although it is restricted in its uses, a half-horse scaffold has an advantage, as it may rest against a finished portion of the wall while work above continues.
Pole scaffolds can be constructed as single or double pole. “Pole” is actually the vertical leg.
Ladder Jack Scaffolds
A ladder jack scaffold refers to a scaffold that is erected by attaching a bracket to a ladder to support the scaffold planks. The following requirements should be kept in mind when using ladder jacks:
- Use for light work or for work of short duration.
- The maximum height is 4.5 m (15 ft) above the grade.
- The supporting ladders must not be more than 3 m (10 ft) apart.
- Ladders must be tied in position at the top and the bottom.
- The support brackets should be supported by the side rails of the ladder or have at least
- 14.3 mm (9/16 in) of width resting on the ladder rung.
- There should be no more than two workers on the scaffold at one time.