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Unformatted text preview: ist tower shall be screened or otherwise protected on all sides
to a height of not less than 1.80 meters. 4.3.4 Every hoist tower shall be secured in not less than four directions against swaying
or tipping, at intervals of not more than 9.75 meters in its height, be steel cable
guys adequately achored or by other satisfactory means.
Such towers which are constructed adjacent to buildings shall be secured to the
building frame at each floor as the construction progresses. 4.3.5 4.3.6 4.4 Hoist towers erected within the building, but not occuplying the entire opening
through which they pass, shall be completely enclosed on all sides and shall be
provided with doors at the unloading points unless the platform hoist is solidly
enclosed on all sides to the height to which material is to be loaded or unloaded.
Landing platforms in hoist towers or platform connecting hoist tower to a
building or other structure shall be provided with guard rails and toe boards. Derricks and Cranes
4.4.1 Derricks shall be so designed and assembled that no part shall be stressed byond
the safe working stress for the material under its maximum rated load in any
possible position. Such maximum load shall be conspicuously posted on each
derrick. 4.4.2 The foot-block of every derrick shall be firmly secured against motion in any
direction. 4.4.3 Guy derricks shall have the top of the mast held by not less than six (6) steel guy
cables secured by firm anchorages and so placed that the angle of the guy with the
mast shall be as large as possible.
4.4..4 4.4.5 Use and operation of cranes shall be in accordance with Section 3 of Rule X. 4.4.6 4.5 The moving parts of derrick and cranes shall be kept well lubricated. All parts
shall be inspected at least every other day. In the operation of cranes, and similar devices a standard signal system shall be
used and all ment assigned to the operation of such equipment shall be fully
instructed on the signals. Cables, Ropes, Chains and Blocks
4.5.1 All ropes and cables used in connection with scaffolds, derricks and hoisting
apparatus shall be tested before being put to use and at least once every 30 days while in use, to insure their safety and suitability for the purpose. Any rofpe or
cable found to be unsafe or unfit shall not be used.
4.5.2 Cables, ropes, chains and blocks shall be of such size that the maximum load
supported by them will not exceed one sixth (1/6) of their breaking strength.
Blocks designed for use with abaca ropes shall not be used for steel cables.
Blocks used at or near floors or in other exposed places to change the direction of
cables shall be enclosed or otherwise effectively guarded. 4.5.3 4.5.4
4.6 Chains shall not be used for slings, bridles or other similar purposes, but shall be
restricted to only such purposes as require a straight pull.
Hooks shall not be used for hoisting buckets, cages or skips. Ladders and Temporary Stairway
4.6.1 Except where either permanent or temporary stairways or runways are req...
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- Fall '12