22.F.03 Testing
- Prior to initial use and after any modification of the structural members or secure attachment points, the platform must be proof tested to 125% of its rated capacity. The test must take place on a structure the scaffold was designed for or a test structure with similar support member characteristics.
- Prior to use on each jobsite or placement location, hanging scaffolds must be performance tested to 100% of the maximum intended load for the expected work. This test must be performed with the scaffold attached to the structure in the work location.
22.F.04 Operations
- Scaffolds and their attachments must be inspected by a CP prior to initial use on a worksite, before use on each work shift, and regularly during use until they are removed.
- Workers must use properly selected and anchored personal fall protection when accessing and working on hanging scaffolds. Personal FP system components must meet the requirements of Section 21.I.05. No part of a hanging scaffold must be used as an anchor point for personal FP.
- The number of workers on the platform must not exceed the number listed on the scaffold.
- Ladders may not be used on hanging scaffolds, except as a means of access from above the deck. Ladders used for access must meet the requirements of Section 24.B.
- Hanging scaffolds must be coated or painted to minimize corrosion of the components. Storage between uses must be designed to minimize damage to the scaffold.
22.G Form and Carpenter's Bracket Scaffolding.
22.G.01 Scaffolds must be constructed of wood, steel, or aluminum members with known strength characteristics and be designed to support a minimum load of 25 lbs/ft2 (1.054 kg/m 2).
22.G.02 No more than two persons must occupy any given 8 ft (2.4 m) span of a bracket scaffold at any one time. Tools and materials must not exceed 75 lbs (34 kg) in addition to person(s) occupying the area.
22.G.03 A guardrail or other form of fall protection is required for all open edges when a fall of 6 ft or greater exists (1.8 m) or, when other hazards exist below the platform.
22.G.04 Figure-four scaffolds must be constructed as follows:
- Spacing must be not more than 8 ft (2.4 m) on centers and scaffold must be constructed from sound lumber.
- The bracket ledger must consist of two pieces of 1-in x 6-in (2.5-cm x 15.2-cm) or heavier material nailed on opposite sides of the vertical form support. Ledgers must project not more than 3 1/2 ft (1 m) from the outside of the form support and must be braced and secured to prevent tipping or turning.
- The knee or angle brace must intersect the ledger at least 3 ft (.9 m) from the form at an angle of approximately 45 degrees, and the lower end must be nailed to a vertical support.
- The platform must consist of two or more scaffold planks that extend at least 6 in (15.2 cm) beyond the ledgers at each end unless secured to the ledgers. When planks are secured to the ledgers (nailed or bolted) a wood filler strip must be used between the ledgers. Unsupported projecting ends of planks must be limited to an overhang of 12 in (30 cm).
- The maximum permissible spans for planking must be in conformance with ANSI A10.8 and be consistent with allowable bearer loads.
22.G.05 Metal brackets or scaffold jacks that are an integral part of the form must be securely bolted or welded to the form. Folding-type brackets must be either bolted or secured with a locking-type pin when extended for use.
22.G.06 Clip-on or hook-over brackets may be used on form work provided the form walers are bolted to the form or secured by snap ties or tie-bolts extending through the form and securely anchored. In addition, carpenter bracket scaffolds may be attached by:
- A bolt extending through to the opposite side of the structural wall;
- A metal stud attachment device;
- Welding; or
- Hooking over a secured structural supporting member.
22.G.07 Metal brackets must be spaced not more than 8 ft (2.4 m) on centers.
22.G.08 Scaffold planks must be either bolted to the metal brackets or be of such length that they overlap the brackets at each end by at least 6 in (15.2 cm). Unsupported projecting ends of scaffold planks must be limited to a maximum overhang of 12 in (30.4 cm).
22.G.09 The maximum permissible spans for planking must be consistent with allowable bearer loads.
22.G.10 Folding-type metal brackets, when extended for use, must be either bolted or secured with a locking-type pin.
22.G.11 Wooden bracket form scaffolds must be designed in accordance with Table 22-1 and must be an integral part of the form panel.
22.G.12 Brackets must consist of a triangular shaped frame made of wood with a cross- section not less than 2-in x 3-in (5-cm x 7.6-cm) or of 1-1/4-in x 1-1/4-in x 1/8-in (3.1-cm x 3.1-cm x 0.3-cm) structural angle iron.
22.G.13 The minimum design for wooden scaffolds criteria must be in accordance with Table 22-1.
| Form Scaffolds (Minimum Design Criteria for Wooden Bracket Form Scaffolds) |
||
|---|---|---|
| Members | Dimensions | |
| Bracket uprights | 2 x 4 in or 2 x 6 in (5 x 10.1 cm or 5 x 15.2 cm) | |
| Bracket support ledgers | 2 x 6 in (5 x 15.2 cm) | |
| Maximum bracket width | 3 ft 6 in (1 m) | |
| Bracket braces | 1 x 6 in (2.5 x 15.2 cm) | |
| Guardrail post | 2 x 4 in (5 x 10.1 cm) | |
| Guardrail height | 36 to 45 in (91.4 to 114.3 cm) | |
| Midrail | 1 x 6 in (2.5 x 15.2 cm) | |
| Toeboards | 1 x 6 in (2.5 x 15.2 cm) | |
| Bracket upright spacing | 8 ft (2.4 m) (on centers) | |
| Form Scaffolds (Minimum Design Criteria for Light-Duty Figure-Four Form Scaffolds) |
||
| Members | Dimensions | |
| Bracket uprights | 2 x 4 in or 2 x 6 in (5 x 10.1 cm or 5 x 15.2 cm) | |
| Bracket outrigger ledgers | (2) 1 x 6 in (2.5 x 15.2 cm) | |
| Bracket braces | (2) 1 x 6 in (2.5 x 15.2 cm) | |
| Maximum length of ledgers | 3 ft 6 in (1 m) (unsupported) | |
| Bracket upright spacing | 8 ft (2.4 m) (on centers) | |
22.G.14 Scaffold planks must be either nailed or bolted to the runners or be of such length that they overlap the ledgers at each end by at least 6 in (15.2 cm). Unsupported projecting ends of scaffold planks must be limited to a maximum overhang of 12 in (30.4 cm).
22.G.15 The maximum permissible spans for planking must be consistent with allowable bearer loads.
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22-10. What is required when using Form and Carpenter's Bracket Scaffolding?
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