22.J Adjustable Scaffolds.
22.J.01 Adjustable scaffolds must be designed and constructed in accordance with ANSI/SIA A10.8.
Adjustable Multi-Point Suspended Scaffold
22.J.02 A copy of the user's manual must be kept on site at all times.
22.J.03 Adjustable scaffolds will be secured to the structure in accordance with the manufacturer's user manual.
22.J.04 Safe access.
- If portable ladders are used they will be removed every time the platform is raised or lowered, repositioned to ensure that the 4:1 ratio is maintained, and secured to prevent movement.
- When stair towers are used for access to adjustable scaffolds the difference between the two elevations will be 2 ft (.6 m) or less.
- Self-retracting lanyard, if allowed by the manufacturer, can be used to provide FP when climbing the tower. > See also Section 21.
- On towers over 20 ft (10.7 m), rest platforms will be provided at not more than 20 ft intervals.
22.J.05 The leveling of adjustable scaffold will be accomplished by using leveling jacks.
22.J.06 When bridges are used on a single tower it will be done in strict compliance with the manufacturer's recommendations.
22.J.07 Ratchet driven winding drum hoist must be equipped with a driving pawl and a locking pawl. The locking pawl must automatically engage when the driving pawl is released.
22.J.08 All crank-driven winding drum hoists must employ a positively actuated locking pawl that engages the drive train of the hoist and is actuated by reverse descending movement of the crank handle. This mechanism must not be rendered inoperative by outside contamination.
22.J.09 Every winding drum must contain not less than three wraps of the suspension wire rope at the lowest point of hoist travel.
22.J.10 Each hoist must be provided with positive wire rope attachments. Wire rope attachments must develop a minimum of 80% of the wire rope breaking strength. Wire rope termination methods must be according to the manufacturer's recommendation. U-type wire rope clips must not be used as a wire rope termination method.
22.J.11 The wire rope must be capable of supportable at least six (6) times the scaffold's design load.
22.J.12 Employers must instruct and supervise their employees in the safe use of the adjustable scaffolding provided and must supply them with all of the manufacture's instructional material.
22.J.13 Personnel must not work on scaffolds during storms, high winds or other adverse weather conditions.
22.K Load Handling Equipment (LHE) - Supported Personnel Work Platforms.
> See Section 16.T.
Knowledge Check Choose the best answer for the question.
22-12. How many wraps of suspension wire rope must the winding drum contain at the lowest point of hoist travel?
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