Crane Rentals

Since its earliest appearance in Ancient Greece and Rome, the crane has been indispensable in helping work crews construct buildings, bridges, and other structures. These machines allow people to lower and raise objects of various weights in addition to transporting them horizontally around a work zone. Understanding how these machines work can help you more clearly discern what this amazing mechanism can allow you to do.

What Cranes Can Do

These machines are capable of lifting objects weighing thousands of pounds several stories high. Considering the scope of many of today’s quotidian structures—such as massive skyscrapers and waterway spanning bridges—this fact is more than just informational. Because a crane’s almost unbelievable ability to lift and move extremely heavy objects, hoisting steel beams to the tops of a building is not a problem. Take, for an example, the tower crane, which is commonly used for large building construction. These cranes can typically reach heights of 230 feet (approximately 23 stories) with loads weighing as much as 39,000 pounds.

How Cranes Work

Cranes are an ingenious combination of many simple machines, but to understand how they work, it’s helpful to become familiar with a few terms. The jib refers to the weight bearing portion of the machine—the arm if you will. The amount of force amplification that the machine gives is called mechanical advantage. In other words, in order for cranes to be viable tools, they must provide enough mechanical advantage to allow the user to lift more weight without drastically increasing the amount of force being used.

Cranes use one or more of the following simple machines to gain mechanical advantage: Levers, used in balance-style cranes, allow the machine to lift heavier objects with less force by utilizing a fulcrum. The fulcrum is a fixed point around which the jib rotates. Loads attached to the shorter end of the crane’s arm can be lifted when a small amount of force is applied to the longer end of the arm in the opposing direction. Pulleys use cables to transfer force when the cables are wound around a fixed block and a block closer to the load. Hydraulic cylinders can be used to apply force to the load directly or to move the jib that is attached to a different carrying mechanism.

Why Cranes Are Necessary

Without the use of cranes, there would simply be no effective way to lift extremely heavy objects. Because cranes carry mechanical advantage—they allow for objects to be lifted by smaller forces—the problem of finding feasible ways to move many loads has been solved, allowing engineers more freedom when they are designing a structure. Construction projects that use heavy materials also often make for more stable structures that will last longer and that can withstand more extreme conditions.

Cranes make it possible for people to build the structures that make everyday life more convenient and centralized, helping us master the forces around us instead of being oppressed by them. Because of their simple mechanisms such as levers and pulleys, you can lift heavy objects higher with a crane so that your construction project becomes reality. That’s why we are pleased to offer you the option of crane rental. Talk with a company representative today to learn more and see how easy it is to rent cranes for your work site..


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