Section R. 408.42531 - Prestressed and poststressed concrete operationsRule 2531.
(1) An expendable strand deflection device that is used to pretension concrete members shall have a designed safety factor of not less than 2. A reusable device shall have a safety factor of not less than 3.(2) Expendable and reusable strand deflection devices shall not be loaded in excess of their maximum intended load.(3) An employer shall designate a qualified person to inspect all jacking and pulling equipment before each use and during use.(4) Tensioning strands that have kinks, bends, nicks, and other defects shall not be used.(5) Welding or cutting is prohibited near strand that has been unrolled, strung, or tensioned or at any other location where strand is stored.(6) During jacking operations of any tensioning element or group of tensioning elements, the anchor shall be kept turned up close to the anchor plate.(7) An employee shall not stand in the line of, in back of, or over the jacking equipment during tensioning operations.(8) Only an employee who is operating tensioning equipment shall be permitted in the immediate vicinity when tensioning is in progress.(9) Stress members shall be lifted with the lifting devices at points specifically designed. An employee shall not be under stressed members during lifting and erection.(10) Audible or visual signaling devices shall be operated to warn employees when tensioning operations are under way.(11) All employees who are not directly involved in the tensioning operations shall be cleared from the area and shall remain clear until tensioning operations are completed and the signaling devices are turned off.Mich. Admin. Code R. 408.42531
1980 AACS; 1989 AACS; 2013 MR 1, Edd. Jan. 16, 2013