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(a) Lift-slab operations shall be designed and planned by a civil engineer currently registered in California who determines that he/she has sufficient experience in lift-slab construction to so design and plan the lift-slab operation. Such plans and designs shall be implemented by the employer and shall include detailed instructions and sketches indicating the prescribed method of erection. These plans and designs shall also include provisions for ensuring lateral stability of the building/structure during construction.
(b) Jacks/lifting units shall be marked to indicate their rated capacity as established by the manufacturer.
(c) Jacks/lifting units shall not be loaded beyond their rated capacity as established by the manufacturer.
(d) Jacking equipment shall be capable of supporting at least two and one-half times the load being lifted during jacking operations and the equipment shall not be overloaded. For the purpose of this provision, jacking equipment includes any load bearing component which is used to carry out the lifting operation(s). Such equipment includes, but is not limited, to the following: threaded rods, lifting attachments, lifting nuts, hook-up collars, T-caps, shearheads, columns, and footings.
(e) Jacks/lifting units shall be designed and installed so that they will neither lift nor continue to lift when they are loaded in excess of their rated capacity.
(f) Jacks/lifting units shall have a safety device installed which will cause the jacks/lifting units to support the load in any position in the event any jack/lifting unit malfunctions or loses its lifting ability.
(g) Jacking operations shall be synchronized in such a manner to insure even and uniform lifting of the slab. During lifting, all points at which the slab is supported shall be kept within one-half inch of that needed to maintain the slab in a level position.
(h) If leveling is automatically controlled, a device shall be installed which will stop the operation when the one-half-inch tolerance set forth in Section 1722.1(g) is exceeded or where there is a malfunction in the jacking (lifting) system.
(i) If level is maintained by manual controls, such controls shall be located in a central location and attended by a competent person while lifting is in progress. The competent person must have previously operated the type of manually controlled lifting equipment being used.
(j) The maximum number of manually controlled jacks/lifting units on one slab shall be limited to a number that will permit the operator to maintain the slab level within specified tolerances of section 1722.1(g), but in no case shall that number exceed 14.
(k) No employee, except those essential to the jacking operation, shall be permitted in the building/structure while any jacking operation is taking place unless the building/structure has been reinforced sufficiently to ensure its integrity during erection. The phrase "reinforced sufficiently to ensure its integrity" used in this section means that a civil engineer currently registered in California, independent of the engineer who designed and planned the lifting operation, has determined from the plans that if there is a loss of support at any jack location, that loss will be confined to that location and the structure as a whole will remain stable.
(1) Under no circumstances, shall any employee who is not essential to the jacking operation be permitted immediately beneath a slab while it is to be lifted.
(2) For the purpose of section 1722.1(k), a jacking operation begins when a slab or group of slabs is lifted and ends when such slabs are secured (with either temporary connections or permanent connections).
(l) When making temporary connections to support slabs, wedges shall be secured by tack welding, or an equivalent method of securing the wedges to prevent them from falling out of position. Lifting rods may not be released until the wedges at that column have been secured.
(m) All welding on temporary and permanent connections shall be performed by a certified welder, according to the welding requirements specified in the plans and specifications for the lift-slab operation.
(n) Load transfer from jacks/lifting units to building columns shall not be executed until the welds on the column shear plates (weld blocks) are cooled to air temperature.
(o) Jacks/lifting units shall be positively secured to building columns so that they do not become dislodged or dislocated.
(p) Equipment shall be designed and installed so that the lifting rods cannot slip out of position or the employer shall institute other measures, such as the use of locking or blocking devices, which will provide positive connection between the lifting rods and attachments and will prevent components from disengaging during lifting operations.
NOTE: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.
1. New section filed 10-22-90; operative 11-21-90 (Register 90, No. 48).
2. Amendment of section heading and text filed 8-11-92; operative 9-10-92 (Register 92, No. 33).