Different Types of Crawler-Mounted Cranes
In order to be able to power a large variety of machinery, industrial wheel tractors were modified in the 1920s, by Fordson and McCormick-Deering. Like for instance, half-swing cranes and shovels were made by some companies around the tractor's engine and power train and the wheels became replaced by crawlers.
In the 1930s, crawler tractors came into widespread use. Immediately after, numerous manufacturers began making attachments for them, like for example a variety of lifting machine devices.
Side-mounted booms for example, were utilized primarily for pipe-laying at first and the machinery got the nickname "pipelayer." These types of equipments are currently usually used for attending to cleaning up railroad derailments. Due to their compact design, mobility and size, in addition to outstanding lifting capacity, these types of machines are great for this use. Furthermore, swing booms which mounted on top of the engine compartment became available also.
Similar to a crawler tractor, crawler cranes travel on crawler tracks. Due to their intense weight, these machinery do not move really fast. Normally, the crane may be controlled by 2 or more cable operated drums and is powered by one engine. The crawler cranes come equipped with a telescopic arm or a lattice boom that can be extended easily utilizing hydraulics. The lattice boom has to be assembled manually by adding multiple sections.
Tower Cranes
Usually found in big construction projects, tower cranes are required to be built and broken down on location. They should be transported by truck every time they are relocated. These tower cranes are very tall. They allow construction crews to move heavy steel or concrete building parts to the tops of tall buildings. Tower cranes utilize a hydraulic system to push each and every new crane part up into position and thus, are self-erecting.