Crane manufacturers provide this information for each crane model, and generally, it can be found in your operation manual. Know the maximum pressure the crane will exert on each outrigger during the operation, or the maximum outrigger reaction force. If the ground is wet, allow time to get the moisture out. Ways to improve the ground include compaction, removing un-compacted surface layers, or bringing in rock or other dense inorganic material. Identify any sub-surface hazards and avoid if possible.Įvaluate and improve the ground if needed. This information can be compared to ground bearing pressure charts for different soil types. Because this is an extremely complex combination, it’s a good idea to seek the advice of a geotechnical engineer. A low-cost way to determine ground conditions is to use a Dynamic Cone Penetrometer, which is portable and easy-to-use. Know the bearing strength of the ground and soils. And it needs to be of 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 the load. (OSHA 1926.1402)ĪSME states that outrigger blocking or cribbing must have sufficient strength to prevent crushing, bending or shear failure. Know your responsibilities. In the U.S., OSHA states that cranes must be assembled on ground that is firm, drained and graded sufficiently, in conjunction with supporting materials, such as blocking, cribbing, pads, mats, to provide adequate support and levelness. Here are 10 mobile crane safety tips and topics for successful crane setup. standards and regulatory bodies now place greater emphasis on understanding ground conditions and using crane mats or outrigger pads that are sufficient to provide the necessary foundation support for maximum crane safety. It can be difficult to know if the ground beneath your crane will support the weight and pressure under your outriggers, yet knowing this is critical to safe crane setup. In response to this need, U.S.
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