It is a common mistake to assume that the weight of a load on any crane will be equally distributed across all four pads. You need to calculate the potential force that will be exerted on one pad before deciding whether or not it is safe to perform the lift.
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RULE number one is look for hazards 360 degrees around you before setting up, RULE number two before you set up, you must be a TRAINED COMPETENT worker in this type of activity!
But before you lift before you run out the outriggers did you, have you done a Site Survey It is essential that a survey be conducted to establish what the load to be lifted is, what all the characteristics are, weight, size, type of lifting lugs etc., what the ground conditions are, where it has to be lifted from and to, what the access route is like, etc. The survey must be completed by a competent person(s). No load must be lifted without the following crucial information: - the load weight - the overall dimensions (length, width and depth). - indication of the position of centre of gravity. - the lifting/slinging points - the pickup radius - the final location radius - the height to which the load has to be lifted. - the overall weight (load + all lifting accessories)
Outlined below are the measures needed to protect you from injury as well as guidance on training, selecting materials and using cribbing and blocking to ensure your unit is set up properly. Knowing your equipment has safety features is not enough. You also need to know how to safely use the equipment.
Terms:
The first step is choosing the right product for the application. &#;Three factors must be considered when selecting an outrigger pad: ground conditions, size of outrigger foot, and maximum outrigger load of the equipment. By looking at those three conditions we can recommend the ideal pad that provides high performance load distribution and ergonomic safety,&#; said P bar Y Safety.
Common sense reminders. Examples include:
Selecting Material:
Personal Protective Equipment (PPE):
Use of Cribbing and Blocking:
Blocking under outrigger floats, when required, shall meet the following requirements:
(1) sufficient strength to prevent crushing, bending, or shear failure
(2) such thickness, width, and length, as to completely support the float, transmit the load to the supporting surface, and prevent shifting, toppling, or excessive settlement under load
So how do you determine what &#;adequate support&#; is? You have to calculate it. No rules of thumb, no wing and a prayer, no best guess, just a calculation to determine the size of cribbing/blocking required.
A key thing to remember is that as a crane works and rotates over the various corners and quadrants, the load will shift and at any one time a greater load will be placed on one outrigger than on the others. It is for this reason that equally dividing the load around the outrigger pads is a mistake.
If you consider that 100% of crane and maximum load may be exerted on any one outrigger pad at any time you can plan for proper outrigger set-up.
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Sure it sounds simple, but we all know that having adequate information to complete the calculation on-site can be challenging depending on whom you talk to.
4 step process:
When it comes down to it, a rule of thumb is a principle with broad application that is not intended to be strictly accurate or reliable for every situation. While it is something that is easily learned and applied to make a preliminary determination.
So when setting up cribbing and someone says, &#;just make it 3x times bigger than the outrigger pad&#;, just say NO! Take the time to calculate and plan &#; it can make the difference between a safe lift and a sunken one. This is a great app used to help you the worker get the job done,
General Calculations to Determine the Correct Blocking Size:
Calculator
Examples of Soil Types and Load Bearing Capacities:
*check the load chart or consult the unit manufacturer for the maximum outrigger down pressure for a single outrigger.
Outrigger Pad/Float Size in Square Inches:
Specific Calculations to Determine the Correct Blocking Size:
Maximum outrigger down pressure* ÷ outrigger pad/fl oat square inches = amount of pressure per square inch on the blocking material.
Example:
62,800* ÷ (sq. outrigger pad 36×36) = 48.5 lbs psi
Now consult the soil type chart above. With 48.5 lbs psi, the unit can be safely set up on &#;Mixed granular soil&#; or any soil with a higher load bearing pressure than 48.5 lbs psi.
SafetyTech® is a high load capacity outrigger crane pad with a vertical load bearing capacity of up to 140,000lbs* for our largest size. It is designed to fully support vehicles and cranes without warping, splintering or bending and the pad features a safety textured tread surface to further improve grip and stability. SafetyTech® is manufactured from a highly durable proprietary engineered thermoplastic material which provides exceptional support. It is non-conductive, non-magnetic, and resistant to temperature, chemicals, water, and oil. SafetyTech® features high visibility safety orange patented TuffGrip® handles ensuring optimum maneuverability and will return to normal after bending, retaining its original shape.
*Load bearing capacity is subject to ground conditions. Sizing is subject to a manufacturing variance of +/- 5%.