The steel erector’s solution was to use a Mini or “Spider” Crane provided by Maeda USA. Since Mini Cranes are specialty cranes designed for unconventional lift applications, there are unique safety and logistical considerations when choosing the correct size/type of Mini Crane.
It is important to note they are classified as cranes since the capacities are greater than 2,000 lbs. Therefore, compliance with all OSHA, ANSI and local regulations, in regards to equipment and operator certifications, inspections, etc. is required. Consider the following additional best practices.
As with any crane, always take into consideration details for lift planning, such as the load weight, lift radius, boom length, etc. There are many items to consider for safe hoisting operations. Once the jobsite and lift requirements have been defined the Mini Crane supplier’s representative can assist in selection of the right size to do the job in a safe, efficient manner.
Additional considerations for using Mini Cranes:
1) Egress to the Work Area – Will the crane be hoisted to a roof, or have to travel through or on existing pathways, inclines, doorways?
2) Ground Pressure Requirements – Especially important on rooftop applications. The Maeda Crane representatives can assist in providing data to help in determining if shoring to existing facilities is required.
3) Work Area Hazards -- Be sure to evaluate the work area. Location of overhead powerlines or other obstructions that may be inside or near the “lift zone” need to be identified.
4) Indoor/Outdoor Applications – Mini Crane models have multiple power options, including diesel, gas, LPG or electric.
Mini Crane models distributed in North America must comply with mobile-crane design and manufacture rules and regulations, including OSHA Cranes & Derricks in Construction rule, the ASME B30.5 standard, and Canada’s CSA Z150 compliance standards. OSHA regulations require that Mini Crane design and manufacturing adhere to ASME B30.5.
New York City has set its own rule for Mini Crane usage in construction applications.
There are a number of suppliers of Mini Cranes in North America. See 2018 Lift and Access Buyer’s Guide listing of providers.
Mini Cranes Product Focus by American Cranes & Transport
This Safety Flash was contributed by David Deem of Deem Structural Services LLC, Longview, Texas, in cooperation with SEAA’s Safety Committee. It is designed to keep members informed about ongoing safety issues and to provide suggestions for reducing risk. Best practices are gathered from a variety of sources. They may be more or less stringent than individual corporate policies, and are not intended to be an official recommendation from SEAA. Always get approval and direction from your company officers on any new practice or procedure as these best practices may not work for all situations.
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