chuck lemon 2-14-07
TRANSCRIPT
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Tower Crane Safety Regulations
Chuck Lemon
Division of OccupationalSafety & Health
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Current
Regulations that cover Tower Cranes
WAC 296155525 ANSI B30.31990
OSHA 29 CFR 1926550 Subpart N
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Upcoming New Regulations
WAC 296880 (this number could change)
Available on L&Is Website
ASME B30.32004 (effective now, not
adopted in rule)
OSHAs New Crane Rule (C-DAC)
Available in OSHAs Website
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What the current rules say
WAC 296
525
(2)(a) Operate all cranes per manufacturers
specifications (2)(d) Designate a competent person to
inspect all machinery and equipment prior to
use and periodically during use to make sure
it is safe.
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What the current rules say
WAC 296
525 (cont.)
(2)(e) Have a competent person, or a
government or private agency recognized byL&I perform a thorough annual inspection of
the hoisting equipment and maintain a
permanent record of these inspections.
(2)(f) A tag line must be used on all loadsthat swing freely. Tag lines must be held by
experienced persons.
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What the current rules say
WAC 296
525 (cont.)
(5)(a) Tower Cranes must be erected,
jumped and dismantled under the immediatesupervision of a competent person.
(5)(b) Tower cranes must be erected,
maintained, and used per the manufacturers
specifications. All modifications must beapproved by the manufacturer and
engineered by a PE.
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What the current rules say
WAC 296
525 (cont.)
(5)(c) A professional engineer must certify that the
crane foundations and underlying soil are adequate
support for the tower crane.
(5)(e) Prior to installing a climbing tower crane within
an existing building or new construction, a structural
engineer must certify that the building is designed to
withstand the torque & floor loading created by thecrane to be installed.
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What the current rules say
WAC 296
525 (cont.)
(5)(f) Tower cranes erected on new
foundations must be tested per ANSI B30.3-1990 Chapter 3-1.
This test would include all functional motions,
limiting devices, and brakes for operation.
Limiting devices must be checked for propersetting.
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What the current rules say
WAC 296
525 (cont.)
The functional tests must include slewing,
trolleying, and hoisting with frequent stops,starts, and reversals.
The functional motion test should continue
for 15 minutes during which all controls,
drives, and braking means engaged shallhave functioned correctly.
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What the current rules say
WAC 296
525 (cont.)
(5)(f)(i) Load test not less than 110% capacity for 15
minutes at the maximum radius. Results of test must
be within the manufacturers specifications.
(5)(f)(ii) A record of each test must be made and
signed by the person responsible for conducting the
test. This record must be maintained at the
construction site and made part of the firmspermanent equipment records.
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What the current rules say
WAC 296
525 (cont.)
(5)(j) Limit switches must be installed and keptproperly adjusted. Limit switches must provide the
following functions: (i) Safely limit the travel of the trolley to prevent it from
hitting the outer end of the jib.
(ii) Limit the upward travel of the load block to limit two-blocking
(iii) Lower over travel limiting devices must be provided forall load hoists where hook area is not visible to the operator
(iv) Limit the load being lifted in a manner whereby no morethan 110% of the maximum rated load can be lifted ormoved.
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What the current rules say
WAC 296
525 (cont.)
(5)(k) Only use tower cranes for the proper handling
of freely suspended loads, they are not to be used
for pulling vehicles, removing pilings, pull away loadswhich are attached to the ground or walls.
(5)(p) Tower cranes must have a a functional
slewing brake. When crane is out of operation, the
jib/boom must be pointed downwind and the slewingbrake released so it can weathervane.
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What the current rules say
WAC 296
525 (cont.)
(5)(q) Tower cranes must have a functional
braking system on the trolley. An automaticbrake or device must be installed which will
immediately stop and lock the trolley in the
event that the trolley rope breaks.
(5)(r) All electrical equipment must begrounded and protection must be provided
against lightning.
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What the current rules say
WAC 296
525 (cont.)
(5)(t) All brakes must automatically set in
event of power failure. (5)(u) Climbing jack systems must be
equipped with over-pressure relief valves,
direct-reading gauges, and pilot-operated
hydraulic check valves. These must be ableto prevent jack from retracting should a
hydraulic line or fitting rupture or fail.
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What the current rules say
WAC 296
525 (cont.)
(5)(v) During periods of high winds or
weather affecting visibility, i.e., fog, etc. onlyhandle loads that are consistent with good
safety practices. The practices must be
agreed upon by the operator and the person
in charge of the construction job, with dueconsideration given to the manufacturers
recommendations.
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What the current rules say
WAC 296
525 (cont.)
(5)(x) Tower cranes must be inspected & maintained
per the manufacturers recommendations or more
frequently if reason to suspect a possible defect orweakening of any portion of the structure or
equipment.
(5)(y) Guy wires, wedges, braces or other supports
must be inspected at the beginning and midpoint ofeach work shift to ensure they are functioning as
intended.
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What the current rules say
WAC 296
525 (cont.)
(6)(b) Tower cranes must not be erected or
raised when the wind velocity at the worksiteexceeds 20 MPH or as specified by the
manufacturer.
(6)(c) Tower crane operators must be trained
and experienced in tower crane operations. (6)(f) Buffers must be provided at both ends
of travel of the trolley.
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What the current rules say
WAC 296
525 (cont.)
(6)(h) All hammerhead tower cranes must meet
the requirements for design, construction,installation, testing, maintenance, inspection, and
operation as prescribed by the manufacturer.
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Questions?
Contact information:
Chuck Lemon (360) 902-4669
mailto:[email protected]:[email protected]