Outrigger: A beam which extends from the lower works of a crane to increase the crane’s stability. The beams may be either extendible/retractible or fixed length and typically utilize some type of pad to distribute loads to the ground surface. ( Source: A Glossary of Common Crane and Rigging Terms.
What is the purpose of outrigger pads?
The outrigger pad is used to displace the point of contact pressure PSI/ PSF that the ground sees. The outrigger pad expands & displaces the point of contact from the equipment’s outrigger/ pontoon/ shoe/ float. This will decrease the PSI or PSF for the GBC ( ground bearing capacity).
Are crane outrigger pads required?
Some believe setting up on concrete or asphalt would be safe and you may not need outrigger pads. However, it is recommended to always use outrigger pads under crane floats to distribute ground pressure just in case there is an open cavity or unseen voids,” says Billy Smith EVP of Claims and Risk Management of NBIS.
What is outrigger load?
The outrigger load is specific to the amount of force applied to any one of the outriggers during set-up, operations and tear down of the equipment. To ensure safety, DICA believes the rated capacity of the pads should always exceed the maximum outrigger reaction force of the equipment.
What is the difference between stabilizers and outriggers?
Stabilisers and outriggers have many configurations depending on the application and are used to minimise the risk of toppling when the centre of gravity of the combined load and vehicle is outside the support base of the vehicle. Outriggers lift the vehicle’s wheels off the ground while stabilisers do not.
What are crane mats?
Also known as timber mats or heavy equipment mats, our crane mats are designed to provide ground stabilization under the weight of huge construction sites or even layered under oil rig cranes.
What is a crane quadrants of operation?
The crane’s sweep area that is divided into four quadrants. These are the front, the rear, and each side.
What is cribbing for cranes?
Blocking (also referred to as “cribbing”) is wood or other material used to support equipment or a component and distribute loads to the ground. It is typically used to support lattice boom sections during assembly/disassembly and under outrigger and stabilizer floats.
Do cranes need to be setup on solid level ground?
You must not assemble or use a crane unless ground conditions are firm, drained, and graded to a sufficient extent so that, in conjunction (if necessary) with the use of supporting materials (such as blocking, mats, cribbing, or marsh buggies (in marshes/wetlands), the equipment manufacturer’s specifications for
Does OSHA require outrigger pads?
According to OSHA, safety is always a requirement. OSHA 1926.1402 states that, in all instances in which a crane or other lifting equipment is used, the ground on which the equipment is placed must be firm, sufficiently drained, properly graded, and able to support blocking, cribbing, and outrigger pads.
What is outrigger float?
Float: The rigid pan-like structural component that attaches to the outer end of a mobile crane’s outrigger to provide some load spreading of the outrigger load to the supporting surface. The floats are provided by the crane manufacturer. Also commonly called outrigger float, outrigger pad, outrigger pan, foot, or pad.
What is crawler crane?
Definition: A crawler crane consists of an upper carriage mounted on a crawler type undercarriage. The upper deck and attachments rotate 360º. A crawler crane features either a box or a lattice type straight boom and it may be equipped with an optional jib (boom extension).
How do you measure a crane outrigger pad?
Crane mat size can be calculated by dividing the crane load by the maximum permissible ground pressure. Not only do crane mats used for distribute outrigger loads need to be suitably sized they also need to be strong to withstand the load imposed by the crane outriggers.
What are the stabilizers on a crane called?
What Are Outriggers? Outriggers (sometimes called Stabilizers) are retractable hydraulic `legs’ that extend, like a spider’s legs, away from the truck before they make contact with the ground.
What is counterweight in crane?
A counterweight is a weight that, by applying an opposite force, provides balance and stability of a mechanical system. The purpose of a counterweight is to make lifting the load faster and more efficient, which saves energy and is less taxing on the lifting machine.
What is a jib boom on a crane?
The boom is the horizontal beam that extends from the support and holds the load. The mast is the vertical beam or pipe steel that supports the boom and allows the system to rotate. The moveable hoist is used to lift, position, and lower a load. Another component of most jib cranes is the trolley.
How much does a crane mat cost?
Used Inventory
| Location | Size | Price |
| Houston, Tx | 8×14/8×16 Laminated Mat | $25.00 |
| Houston, Tx | 18’x4’x12″ Crane Mat | $75.00 |
| Houston, Tx | 16’x4’x12″ Crane Mat | $200.00 |
| Houston, Tx | 8’x4’x12″ Crane Mat | $125.00 |
What are bridge mats?
Bridge mats, also known as bridge kits, are an essential to many worksites. They can be used wherever water presents a challenge. Bridging is needed for marshes, streams, rivers, and oceanfront projects. Construction and development projects of all sizes find themselves in need of these important access mats.
What are crane mats made from?
Crane mats are constructed of solid 8”, 10” or 12” timbers and are affixed by steel bolts, providing ground stabilization under extreme weight.
What are the most common types of crane accidents?
OSHA’s analysis of crane accidents identified the major causes of crane accidents as:
- boom or crane contact with energized power lines (nearly 45% of the cases)
- under the hook lifting device.
- overturned cranes.
- dropped loads.
- boom collapse.
- crushing by the counter weight.
- outrigger use, falls and rigging failures.
What must be done before operating a crane OSHA?
The operator must begin hoisting the load to determine, using a load weighing device, load moment indicator, rated capacity indicator, or rated capacity limiter, if it exceeds 75 percent of the maximum rated capacity at the longest radius that will be used during the lift operation.
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