§1681.  Placing of hoisting apparatus; floor re-enforcement

Any hoisting machine or engine used in building construction shall, where practicable, be set up or placed on the ground.  Where it is necessary to place such a machine or engine on any floor above the ground floor, the floor shall be properly and securely supported with a foundation capable of sustaining twice the weight of the machine or engine.

If the building in course of construction is three stories or over in height, no material needed for the construction shall be hoisted or lifted over any public street or alley, unless the street or alley is barricaded from use by the public or is so covered as to prevent injury to pedestrians.