Mich. Admin. Code R. 408.42533 - Lift-slab operations
Rule 2533.
(1) A
registered professional engineer who is qualified in lift-slab operations shall
design and plan lift-slab operations. An employer shall implement the plans and
designs and shall include detailed instructions and sketches that indicate the
prescribed method of erection. The plans and designs shall also include
provisions for ensuring lateral stability of the building or structure during
construction.
(2) An employer shall
ensure that jacks are marked to indicate the rated capacity established by the
manufacturer.
(3) An employer shall
ensure that jacks are not loaded beyond the rated capacity established by the
manufacturer.
(4) An employer shall
ensure that jacking equipment is not overloaded and the threaded rods and other
members that transmit loads to the jacks are capable of supporting not less
than 2 1/2 times the load to be applied. Jacking equipment shall include all of
the following:
(a) Jacks and other lifting
units.
(b) Lifting
angles.
(c) Lifting nuts.
(d) Hook-up collars.
(e) T-caps.
(f) Shearheads.
(g) Columns and footings.
(5) An employer shall ensure that
a jack is designed and installed so that it will not lift or continue to lift
when it is loaded in excess of its rated capacity.
(6) An employer shall ensure that a jack has
a safety device installed that will cause the jack to support the load in any
position if the jack malfunctions or loses its lifting ability.
(7) An employer shall ensure that jacking
operations are synchronized to ensure even and uniform lifting of the slab. An
employer shall ensure, that during lifting, all points of the slab support are
kept within 1/2 of an inch of that needed to maintain the slab in a level
position.
(8) If leveling is
automatically controlled, then an employer shall ensure that a device is
installed which will stop the operation when the 1/2-inch tolerance specified
in subrule (7) of this rule is exceeded or when there is a malfunction in the
jacking system.
(9) An employer
shall ensure that the maximum number of manually controlled jacks on 1 slab is
limited to a number, which shall not be more than 14, that will permit the
operator to maintain the slab level within specified tolerances. The controls
shall be located near a qualified person.
(10) An employer shall ensure that an
employee, except for an employee who is essential to the jacking operation, is
not permitted in the building while any jacking operation is taking place. For
the purpose of this subrule, a jacking operation begins when a slab or group of
slabs is lifted and ends when the slabs are secured with either temporary
connections or permanent connections.
(11) An employer shall ensure that an
employee is not permitted under a slab during jacking operations.
(12) An employer shall ensure that all
welding on temporary and permanent connections is performed in accordance with
the requirements of the American welding society standards AWS D1.1/D1.1M,
"Structural Welding Code Steel," 2002 edition, and AWS B1.10, "Guide for the
Nondestructive Examination of Welds," 1999 edition. These standards are adopted
by reference in
R
408.42503. An employer shall ensure that the welders
are familiar with the welding requirements specified in the lift-slab plan and
specifications.
(13) An employer
shall ensure that load transfer from jacks to building columns is not executed
until the welds on the column shear plates are cooled to air
temperature.
(14) An employer shall
ensure that jack-lifting units are positively secured to building columns so
that they do not become dislodged or dislocated.
(15) An employer shall ensure that equipment
is designed and installed so that the lifting rods cannot slip out of position
or the employer shall initiate other measures, such as the use of locking or
blocking devices, that will provide attachments and prevent components from
disengaging during lifting operations.
(16) Lifting devices, other than jacks
covered by subrule (4) of this rule, shall be of sufficient strength and design
to provide a safety factor not less than 5 times the working load.
Notes
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