Aerial Imagery Aids
Determining where to place a crane on a jobsite is an important element of the crane’s performance writes Erin Jepperson, the author of an April 2018 article published by American Cranes & Transport magazine. Jepperson writes; “determining where to place a crane on a jobsite is a critical element in the crane’s performance. Heavy-lift engineers are turning to high-resolution aerial imagery to identify worksite obstacles, confirm ground conditions, and communicate crane logistics and jobsite positioning”.
When it comes to understanding ground conditions, OSHA states that “The equipment must not be assembled or used unless ground conditions are firm, drained, and graded to a sufficient extent so that, in conjunction with supporting materials, (such as blocking, cribbing, pads, or mats) the equipment manufactures specifications for adequate support and degree of level of the equipment are met.” (OSHA 1926.1402).
“Improper installation of a crane is one of the leading causes of catastrophic construction accidents. Unexpectedly soft, marshy or unlevel ground conditions not identified during initial onsite visits can hinder proper blocking and stabilization of any sized crane.
Through aerial view maps captured at different times throughout the year, heavy lift engineers are able to thoroughly survey and assess ground conditions surrounding a worksite, observe possible flooding patterns and areas that tend to puddle heavily after rainstorms and identify any potential trees or shrubbery that might complicate crane sites.”
As the application of new tools such as drone-captured photography become more commonplace on construction sites, the benefits for lift planners are obvious. Proactively identifying work site hazards that impact proper crane setup reduces downtime and risk.
As a key part of lift plan design and safe operations, DICA recommends using professionally engineered and sized outrigger pads and crane pads to effectively and efficiently reduce ground bearing pressures. Learn more about DICA’s 3 Step Fitting Process here.