Various KInds of Crawler-Mounted Cranes
In order to be able to power a huge range of machinery, industrial wheel tractors were modified in the 1920s, by McCormick-Deering and Fordson. Like for instance, half-swing shovels and cranes were manufactured by some companies around the engine and power train of the tractor and the wheels became replaced by crawlers.
Crawler tractors came into widespread use in the 1930s. Immediately after, numerous manufacturers began manufacturing attachments for them, including a variety of lifting equipment devices.
Side-mounted booms for instance, were utilized primarily for pipe-laying at first and the equipment got the nickname "pipelayer." These equipments are frequently utilized now for attending to cleaning up railroad derailments. Due to their compact design, mobility and size, in addition to excellent lifting capacity, these types of equipments are ideal for this use. As well, swing booms that mounted on top of the engine compartment also became available.
LIke a crawler tractor, crawler cranes travel on crawler tracks. Because of their intense weight, these machinery do not move very fast. Usually, the crane is powered by one engine and could be controlled by 2 or more cable operated drums. The crawler cranes come equipped with a telescopic arm or a lattice boom that could be extended easily utilizing hydraulics. The lattice boom must be manually assembled by adding many sections.
Tower Cranes
Tower cranes are the ones found in big construction projects. These types of cranes are necessary to be built and broken down on location. They must be transported by truck every time they are relocated. These tower cranes are very tall. They enable construction crews to move concrete building parts or heavy steel to the tops of tall buildings. Tower cranes use a hydraulic system in order to push each and every new crane part up into place and hence, are self-erecting.