R 408.42523 Vertical slip forms.

Rule 2523. (1) Field operations for vertical slip forms must be under the supervision of a qualified person. The qualified person shall be present on the deck during slipping operations. (2) A lift must proceed steadily and uniformly and must not exceed the predetermined rate of lift. (3) The steel rods or pipe on which the jacks climb or by which the forms are lifted must be specifically designed for climbing or lifting. The rods must be adequately braced if they are not encased in concrete. (4) Jacks and vertical supports must be positioned so that the vertical loads are distributed equally and do not exceed the capacity of the jacks. (5) The jacks or other lifting devices must be provided with mechanical dogs or other automatic holding devices to prevent slippage due to the failure of the power supply of the lifting mechanism. (6) Vertical slip forms must be provided with scaffolding or work platforms that completely encircle the area of placement. The scaffolds must be as prescribed in Construction Safety and Health Standard Part 12 “Scaffolds and Scaffold Platforms,” as referenced in R 408.42503. (7) Lateral and diagonal bracing of vertical slip forms must be provided to prevent excessive distortion of the structure during the jacking operation. (8) During a jacking operation, a qualified person shall maintain the form structure in line and plumb.