Posted on: 11 June 2020Share
Mobile cranes are indispensable equipment in a construction project since they aid in the movement of materials, tools and personnel to higher levels of a structure. Mobile cranes are available in different shapes and sizes. Therefore, when hiring a mobile crane, you should bear in mind a few crucial factors, such as crane measurements, load capacity and site conditions, among others. This article reviews some key tips to consider when hiring a mobile crane.
The weight of a load, which is denoted in tonnage, is an integral aspect for first-timers to consider when hiring a mobile crane. The reason is that different mobile cranes have varying tonnage capacities that must not be exceeded. Surpassing the weight capacity of a mobile crane can be a safety violation in many jurisdictions, and it is likely to cause accidents or even deaths. It is essential to note that the weight capacity of a crane is inversely proportional to distance. What this means is that as the weight limit reduces, the distance increases. Therefore, you should determine the load to be hoisted in relation to the distance a load will be moved. Apart from weight and distance, you should also consider the safety margin or tipping weight. Safety margin refers to the point at which a load being hoisted on a crane becomes unsafe. Notably, crane loads should not surpass 85% of the tipping weight.
Length of the Boom
When hiring a mobile crane, you should consider the boom length. A boom is an essential part of a crane, which helps to carry loads to required distances. In calculating boom length, you should not consider other attachments or the jib. When determining boom length, it is vital to bear in mind a few issues. For example, you should consider the contraction and extension of a boom. Also, factor in the angle of inclination since a boom moves in a 360-degree motion. Besides, consider the boom height when elevated at a particular angle during operation. Furthermore, your lifting needs in terms of tonnage should be incorporated when calculating boom length.
The conditions of a job site should determine the type of mobile crane to hire. Rough or muddy sites might require special outriggers to support a crane in such unstable conditions. The ground bearing capacity can help to determine the right choice of outrigger pads required to distribute the load over a large area. Furthermore, if you have a small site, you need a compact crane that can easily access the job site and maneuver easily before installation. The reverse is valid for a large worksite.