Washington Administrative Code › Title 296 - Labor and Industries, Department of › Chapter 296-155 - Safety standards for construction work › Part O - CONCRETE, CONCRETE FORMS, SHORING, AND MASONRY CONSTRUCTION › Section 296-155-694 - Requirements for lift-slab construction operations

Current through Register Vol. 24-14, July 15, 2024
(1) Lift-slab operations must be designed and
				planned by a registered professional engineer who has experience in lift-slab
				construction. You must implement such plans and designs and they must include
				detailed instructions and sketches indicating the prescribed method of
				erection. These plans and designs must also include provisions for ensuring
				lateral stability of the building/structure during construction.
(2) Jacks/lifting units must be marked to
				indicate their rated capacity as established by the manufacturer.
(3) You must not load jacks/lifting units
				beyond their rated capacity as established by the manufacturer.
(4) Jacking equipment must be capable of
				supporting at least two and one-half times the load being lifted during jacking
				operations and you must not overload the equipment. 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.
(5) Jacks/lifting units must be designed and
				installed so that they will neither lift nor continue to lift when they are
				loaded in excess of their rated capacity.
(6) Jacks/lifting units must 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.
(7) Jacking
				operations must be synchronized in such a manner to ensure even and uniform
				lifting of the slab. During lifting, you must keep all points at which the slab
				is supported within 1/2 inch of that needed to maintain the slab in a level
				position.
(8) If leveling is
				automatically controlled, a device must be installed that will stop the
				operation when the 1/2 inch tolerance set forth in subsection (7) of this
				section is exceeded or where there is a malfunction in the jacking (lifting)
				system.
(9) If leveling is
				maintained by manual controls, such controls must be located in a central
				location and attended by a competent person while lifting is in progress. In
				addition to meeting the definition in WAC
				296-155-012(4),
				the competent person must be experienced in the lifting operation and with the
				lifting equipment being used.
(10)
				You must limit the maximum number of manually controlled jacks/lifting units on
				one slab to a number that will permit the operator to maintain the slab level
				within specified tolerances of subsection (7) of this section, but in no case
				must that number exceed 14.
(11)
				You must not permit any employee, except those essential to the jacking
				operation, 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 subsection means that a registered professional
				engineer, 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.
(a)
				Under no circumstances, must you permit any employee who is not essential to
				the jacking operation to be immediately beneath a slab while it is being
				lifted.
(b) For the purpose of
				subsection (11) of this section, 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).
(c) Employers who comply with Appendix A to
				WAC 296-155-694 are considered to be
				in compliance with the provisions of subsections (11) through (11)(c) of this
				section.