#271 Tower Rolling Scaffolds
The specifications for tower and rolling scaffolds are as follows:
a) The “height-to-base” must not exceed 3:1 unless the scaffold is secured. 1646(a)
b) A screw jack must extend 1/3 of its length into the leg tube and the exposed thread must not exceed 12 in. 1646(b)(2)
c) Two wheels or casters must swivel; all four must lock. 1646(c)
d) A fully planked platform is required. 1646(e)
e) All frame and center joints shall be locked together by lock pins, bolts, or equivalent fastenings. 1646(d)
f) The scaffold must have horizontal diagonal bracing (see Illustration 9). 1646(b)
g) Railings are required if the platform is 7 1/2 ft. or more above grade. 1646(b)
h) Ladders or other unstable objects shall not be placed on top of rolling scaffolds to gain greater height. 1646(f)
i) When scaffolds are built on motor trucks or vehicles, they must be rigidly attached to the truck or vehicle. 1646(g)
j) Trucks or vehicles that have scaffolds attached to them shall have a device in use whenever employees are on the scaffold that prevents swaying or listing of the platforms. 1646(h)
k) Employees may ride on rolling scaffold moved by others below if the following conditions exist: 1646(i)
The floor or surface is within 3 degrees of level, and free from pits, holes, or obstructions.
The minimum dimension of the scaffold base, when ready for rolling, is at least 1/2 of the height. Outriggers, if used, shall be installed on both sides of staging.
The wheels are equipped with rubber or similar resilient tires. For towers 50 ft. or over, metal wheels may be used.
The manual force used to move the scaffold shall be applied as close to the base as practicable, but not more than 5 ft. (1.5 meters) above the supporting surface of the scaffold.
Before a scaffold is moved, each employee on the scaffold shall be made aware of the move.
No employee shall be on any part of the scaffold which extends outward beyond the wheels, casters, other supports.