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A derrick crane is a stationary or small mobile crane with a long, fixed-length tower that rotates at the base. It uses four lines for stability and can move freely in any direction, making it useful for construction sites and shipping platforms. It is commonly used to lift objects to high locations and is anchored in four points for stability.
A derrick crane is a specific style of lifting machine. It is usually a stationary crane, meaning it is erected and disassembled at the location where it is used, although there are some very small mobile models. Generally, the crane is characterized by its long, fixed-length tower. These cranes are typically used in locations where items need to be moved from a common starting point to a single nearby location, such as shipping platforms and construction sites.
This crane consists of a tower that rotates at the base. The tower usually consists of a framework of steel pipes and bracing, which creates a lot of strength. The tower is connected to four lines that work independently of each other, allowing the crane tower to move freely in any direction. A single fifth line hangs from the end of the tower and has a hook at the end. This line moves up and down and snaps to objects.
Because the hook can go up and down freely, a tower crane is often used to lift and lower objects to a high location, such as in high-rise buildings. Often, during the final stage of construction, a crane is brought to the top of the building and erected on the roof. The tower then lowers the equipment to the ground, after which it is also disassembled and brought ashore.
Another common location for a derrick crane is on shipping rigs. It is very common to find smaller cranes loading and unloading boats and trains at shipyards. The crane remains in a fixed position on the platform or occasionally on the ship’s deck. Since the transports can go all the way up to the platform, the relative distance that the cargo has to travel is very short.
This crane works using very specific physical principles. It uses four lines with different origin points that join at the end of the tower. This provides additional stability to the tower, as it is anchored in four points, rather than just one like a normal crane. This also allows free movement of the crane, as lines can be brought in or out at different speeds, allowing the tower to move without sacrificing stability.
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