LATTICE BOOM CRANES

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LATTICE BOOM CRANES
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WHAT IS A LATTICE CRANE?
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• The lattice cranes boom consists of a steel
  web-like framework that is capable of lifting and
  supporting heavy loads.

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CRANES IN THE CONSTUCTION INDUSTRY

• CRANES ARE INDESPENSABLE IN THE CONSTRUCTION
  INDUSTY.
• CRANE OPERATION COORDINATION IS ONE OF THE MOST
  IMPORTANT ELEMENTS OF A CONSTRUCTION PROJECT.

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HARD FACTS

• MORE THAN 20 PERCENT OF CONSTRUCTION FATALITIES
  ARE DUE TO CRANE ACCIDENTS.
• ALSO, HUNDREDS OF THOUSANDS OF DOLLARS IN DAMAGES
  ARE CAUSED BY CRANE MISHAPS.

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• MORE THAN 50 PERCENT OF CRANE ACCIDENTS ARE
  CAUSED BY IMPROPER CRANE SET UP.

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SOME ACCIDENTS

• March 9, 2001 Glynn Littlefield, killed when the
  anti-two block system failed and the ball snapped
  from the cable and fell hitting him in the face.
• December 5. 2005 Robert Ruffner, 34, was killed
  due to the crane hitting overhead power lines.
• December 12, 2002- Mark M. Pease. Mark Pease, 44
  years old, an Ironworker, Local 118, Sacramento,
  was killed tragically by a collapsing crane.

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OSHA REGULATIONS

• UNDER OSHA REGULATIONS
• SUB PART N
• CRANES, DERRICKS, HOISTS, ELEVATORS, AND
  CONVEYORS
• STANDARD NO. 1962.550
• TITLE CRANES AND DERRICKS

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GENERAL REQUIREMENTS

• EMPLOYER MUST COMPLY WITH MANUFACTURERS SPECS
  AND LIMITATIONS APPLICABLE TO CRANE OPERATION. IF
  THESE ARE UNAVAILABLE THEY WILL BE DETERMINED BY
  QUALIFIED AND COMPETENT ENGINEER. ATTACHMENTS
  USED BY CRANES SHALL NOT EXCEED CAPACITY, RATING,
  OR SCOPE RECOMMENDED BY MANUFACTURER.

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• WHEN CRANE OPERATORS PUSH CRANES TO THEIR
  LIMITATIONS FATAL ACCIDENTS WILL OCCUR.

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• RATED LOAD CAPACITIES, RECOMMENDED OPERATING
  SPEEDS, SPECIAL HAZARD WARNINGS, OR INSTRUCTION
  SHOULD BE POSTED ON ALL EQUIPMENT.
• THE OPERATOR SHOULD BE COMPETENT, EXPERIENCED AND
  ABLE TO CALCULATE LOADS.

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SUPPORTING SURFACE

• Soil Conditions must be sufficient.
• Outriggers must be used with blocking and
  cribbing.
• Crane shall be uniformly level within 1 of level
  grade.

BLOCKING OR CRIBBING SPREADS LOAD

VIOLATION
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WIRE ROPES

• Running ropes with 6 randomly distributed broken
  wires in one lay or 3 broken wires in one strand
  in one lay or wear of 1/3rd the original diameter
  of wire shall be taken out of service.

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LOAD LINES

• Load Lines shall be capable of supporting,
  without failure, at least 7 times the maximum
  intended load, except that where rotation
  resistant rope is used, the lines shall be
  capable of supporting without failure, at least
  10 times the maximum intended load.

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WATCH FOR POWER LINES!

• CRANE OPERATORS MUST BE AWARE OF ANY NEAR BY
  POWER LINES.

CRANE IN SALT LAKE CITY, UT EXPLODES IN FLAMES
WHEN IT TOUCHES A POWER LINE.
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SAFE DISTANCES

• Lines rated 50kV or below, minimum clearance
  shall be 10 feet
• Lines rated over 50kV, minimum clearance shall be
  10 feet plus 0.4inch for each 1kVover 50kV.

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IS IT SAFE?

• CAREFUL PLANNING AND COORDINATION IS VITAL TO
  CRANE SAFETY.
• CRANE CHOSEN MUST BE SUITABLE FOR THE TASKS AND
  ADEQUATE FOR THE SITE CONDITIONS.
• SITE SUPERVISOR MUST BE PRESENT AT ALL TIMES FOR
  CRANE OPERATIONS AND MUST BE KNOWLEGEABLE ABOUT
  CRANES AND PROCEDURES.
• IF REGULATIONS ARE MET CRANES ARE SAFE!

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FURTHER INFORMATION

• PLEASE REFERE TO THESE WEBSITES FOR MORE
  INFORMATION ON LATTICE CRANE SAFETY
• http//www.osha.gov/pls/oshaweb/owadisp.show_docum
  ent?p_tableSTANDARDSp_id10760
• http//www.craneoperator.com/MISHAPS/Mishaps-2006-
  05-31.htm