What are outriggers on a crane?
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.
How do you work out outrigger loads?
Calculate the FORCE exerted on the ground (i.e. crane weight and attachments, plus load weight and rigging) Obtain the Ground Bearing Capacity (GBC) permitted for the soil you are set-up on. This is the PRESSURE the soil can withstand. Determine AREA by calculating FORCE ÷ PRESSURE.
What are important considerations before lifting a load?
What should you do before moving a load? Make sure you have the required training, qualifications, or certification as determined by your jurisdiction to operate the crane. Make sure the crane is suitable to lift and travel the load. Make sure the job site is planned and laid out.
Which of the following must be done before operating a crane?
Follow the listed safety guidelines before initial start up: Level the crane and ensure support surface is firm and able to support the load; contact power line owners and determine precautions; know the location and voltage of overhead power lines; know the basic crane capacities, limitations, job site restrictions; …
How far should a crane be from an excavation?
OSHA guidance (but no actual standard) says 1.5:1. The answer may be 6 meters in the US. Dutch Crane Rental Requirements call for distance to top of slope > depth of excavation, or at least 1.5 meters. They assume sandy loose soil so slope distance is equal to 1.5:1.
What is Crane checklist?
Checking for visible damages including wire ropes, crane hook, outriggers. … etc. Checking the machine condition such as control, brakes, warning signs and more. Checking and inspecting the area of operation.
What is the minimum size for a block placed under an outrigger float?
A Rule of Thumb
An outrigger pad should be at least three times the square surface area of the outrigger shoe or float, provided you are working on Grade A soil conditions.
What must you know when using a load chart?
The load charts are specific to the make, model and configuration of a specific piece of equipment. Don’t forget to include adjustments for buckets, boom extensions, load blocks, hoisting rope and other attachments that will alter the lifting capacity of the crane or equipment used to perform the lift.
How do you calculate crane load?
Measuring the dimensions of this triangle will allow you to achieve an accurate crane load calculation.
- The standard calculation for maximum crane capacity is (r)(hC)/100.
- R = Radius between the ground and load.
- hC = Lifting height multiplied by the capacity.
30 мар. 2020 г.
Is a crane boom considered a suspended load?
What Is a Suspended Load? Loads may be suspended by forklifts; wheel loaders, and overhead, boom, and jib cranes. Essentially, anything that is lifted above ground is considered a suspended load. You’ll find such loads on riggings, slings, pallets, and various pieces of equipment.
Can you walk under a crane boom?
The rule is simple: “Don’t stand, walk, or work under crane booms, buckets or suspended loads.” Prior planning of crane operations usually takes into account the area to be covered by the swing of the boom. … Employees should stay clear when the crane operator is landing the bucket and during the take-away.
What should you do before picking up and moving something heavy?
There are some simple things to do before and during the lift/carry:
- Remove obstructions from the route.
- For a long lift, plan to rest the load midway on a table or bench to change grip.
- Keep the load close to the waist. …
- Keep the heaviest side of the load next to the body.
4 дек. 2020 г.
Which one of the following is not considered to be a crane related hazard?
OSHA’s analysis of crane accidents in general industry and construction identified an average of _____ fatalities per year. Which one of the following is NOT considered to be a crane-related hazard? According to OSHA, hoisting personnel on a platform is NOT considered to be a crane-related hazard.
What types of power does a Category 1 or 4 Crane generally use and what is its source?
Category 1 and 4 Crane Power Types Category 1 and 4 cranes generally use electric or hydraulic power that is supplied by a diesel engine. A collector ring system conveys electrical current from the revolving portion of the crane to the lower crane structure.
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.