Today’s heavy lift cranes weigh almost as much as the loads they lift, which means getting them to the job site can be a challenge.
Not only do crane companies need to be experts in the field, they need to be experts in federal and state Department of Transportation requirements for getting equipment to the job site. Even a small company traveling within its own state has to deal with load limits on roads and bridges. They have to know about special vehicle registration, when permits are required, and what permits are required. They need to know when to remove weight from the crane, and how to transport the boom and counterweights separately. Larger companies, traveling over state lines, need to know the subtle differences in requirements from state-to-state or may be faced with large fines, travel delays, or accidents.
Extra planning is required if any part of the travel is off-road or on non-paved roads. The travel plan could call for removing weight from the crane in order to stay within weight requirements on public-paved roads. When going off-road, it may be necessary to use wood, metal or cement matting over the full route of travel, or in extreme cases, building a road that can handle the weight of a crane.
It is always important to consider ground support around the entire working area, not just where the load will be lifted.
It is common to think that if the ground is firm enough under the outriggers toward the lift, then the crane will be supported. However, this 500 ton All-Terrain crane has several tons of counterweight being supported by the outriggers on the opposite side of the crane.
If the crane swings over an outrigger, thousands of pounds per square inch of pressure impacts the float and the ground beneath it. Generally, the times three rule for blocking is adequate, but the actual load pressure on the ground for a crane configured similarly must be calculated. Additionally, a compaction test should be conducted to determine ground support.
After obtaining this information, a proper size blocking can be chosen for lifting the load safely.
Read the entire story at Vertikal.net.
May 27, 2014 (Sanford, Fla.)—Crane Institute of America announces the release of the first cards in the new Ready Reference Series. The laminated, pocket-sized cards cover topics that are useful for lift directors and crane and rigging inspectors, as well as others with responsibility for overseeing crane activities on the job site.
The first three cards in the Ready Reference Series feature Wire Rope Inspection, Crane Setup, and Working Around Power Lines.
“Both ASME B30.5 and OSHA 1926 Subpart CC for Cranes and Derricks in Construction discuss the job site responsibilities for controlling entities, site supervisors, lift directors, assembly/disassembly directors, crane owners, and others. The Ready Reference Cards are designed to provide these individuals with technical and safety guidelines that are reflection of industry standards and regulations,” said Jim Headley, President and CEO of Crane Institute of America.
The Wire Rope Inspection card makes it easy for inspectors to determine when the wire rope must be removed from service. The card lists wire rope sizes from 3/8” to 1-3/4” (10 mm to 45 mm on back) and the minimum diameter allowed in both fractions and decimals – taking the math out of the inspection.
Crane Setup addresses site preparation, one of the most important aspect of crane operation and explains who is responsible for ensuring the ground will support the crane and loads lifted. Additional information is provided on positioning the crane, maintaining clearances with power lines, and avoiding potentially unstable ground.
Working Around Power Lines summarizes key information about the clearances required when working near or driving under power lines, how and when to use signalpersons. It also includes reminders about how operators and other personnel are to respond in case of contact with live lines.
Future Ready Reference cards will cover Assembly/Disassembly and other topics for individuals...