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Descriptions of tower crane

Views: 0     Author: Site Editor     Publish Time: 2023-04-18      Origin: Site

Assembly

Tower cranes are typically assembled from larger range telescopic (mobile) cranes,and for tower cranes that go up when building very tall skyscrapers,smaller cranes (or derricks)) are often hoisted to the roof of a completed tower for subsequent removal by crane, which can be more difficult than erection.Tower cranes can be operated by remote control, eliminating the need for the crane operator to sit in a cab on top of the crane.

Operations

Each model and unique style of tower crane has a predetermined lifting chart that can be applied to any available radius depending on its configuration.Similar to mobile cranes, tower cranes can lift much heavier objects closer to their center of rotation than at their greatest radius.The operator manipulates multiple levers and pedals to control every function of the crane.

Security: mobile crane

Tower crane anti-collision systems are used when tower cranes are used near buildings, roads, power lines or other tower cranes. This operator support system reduces the risk of hazardous interactions between tower cranes and other structures.In some countries, such as France, collision avoidance systems for tower cranes are mandatory.

Self-erecting tower crane:

Typically a walking tower crane, a self-erecting tower crane is shipped as a unit and can be assembled by a qualified technician without the assistance of a large mobile crane.They are bottom slewing cranes standing on outriggers without a jib, with counterweight and ballast at the bottom of the mast,cannot climb on their own, have reduced lifting capacity compared to standard tower cranes, and are rarely operated room.In some cases, the shafts of smaller self-erecting tower cranes may be permanently attached to the tower sections to make it easier to maneuver the crane on site.Tower cranes can also use hydraulically driven jack frames to lift themselves to add new tower sections without any other crane assistance beyond the initial assembly stage.That's how it grows as the building rises to almost any height needed to build the tallest skyscrapers.The maximum unsupported height of a tower crane is approximately 265 feet.For a video of a crane getting taller. 

Telescopic:

Telescopic cranes have a boom that consists of many tubes that are mounted one after the other.A hydraulic cylinder or other powered mechanism extends or retracts the pipe to increase or decrease the overall length of the boom.These types of booms are often used for short-term construction projects, rescue work, lifting boats in and out of water, etc.The relative compactness of telescoping booms makes them suitable for many mobile applications.While not all telescopic cranes are mobile cranes, many of them are truck mounted.A telescoping tower crane has a telescoping mast and usually has a superstructure (boom) on top so it can be used as a tower crane. Some telescopic tower cranes also have telescopic booms.

Hammerhead:

A "hammerhead" or giant jib crane is a fixed-boom crane consisting of a steel supporting tower on which a large horizontal double cantilever swivels; Mechanical and counterweight support.In addition to the lifting and swiveling motions, so-called "swing" motions are provided, by which a suspended load trolley can be moved in and out along the jib without changing the height of the load.This horizontal movement of the load was a distinctive feature of later crane designs.These cranes are usually larger in size and can weigh up to 350 tons.The Hammerkran's design was first developed in Germany at the turn of the 19th century and was adopted and developed by British shipyards to support the warship building program from 1904 to 1914.The hammerhead crane's ability to lift heavy objects was helpful in installing large battleships such as armor plating and gun barrels.Japanese and American naval shipyards also installed giant jib cranes.The British government also installed a giant jib crane at the Singapore Naval Base (1938), and later installed a replica of the crane at the Garden Island Naval Shipyard in Sydney (1951).These cranes provide maintenance support to combat fleets far from the UK.

Level Amplitude:

Typically, a crane with an articulated boom will move (or swing) the hook up and down as the boom moves.A horizontal luffing crane is a crane of this common design, but with an extra mechanism that keeps the hook at the same level while luffing.

Elevated:

An overhead crane, also known as an overhead crane, is a type of crane in which the hook-and-wire mechanism runs along a horizontal beam, which itself runs along two widely separated rails.It is usually located in a long factory building and runs along the tracks along the two long walls of the building.It is similar to a gantry crane.Overhead cranes usually consist of single or double girder construction.These can be built using typical steel girders or more complex box girder types.When needing 10 tons and above for heavier capacity systems, double girder bridges are more typical. The advantages of the box-girder configuration result in a lighter system but greater overall system integrity.Also included are cranes to lift items, bridges to span the area covered by the cranes, and trolleys to move along the bridges.

The most common overhead cranes are used in the steel industry.At each step of the manufacturing process, until it leaves the factory as a finished product, the steel is handled by overhead cranes.Raw materials are poured into the furnace by cranes, hot steel is stored and cooled by bridge cranes, finished steel coils are lifted by bridge cranes and loaded onto trucks and trains, and bridge cranes are used by manufacturers or stampers to move steel around his factory.The automotive industry uses overhead cranes to move raw materials.Smaller workstation cranes handle lighter loads in work areas such as CNC mills or saws.Almost mills use overhead cranes for regular maintenance, which requires removal of heavy press rolls and other equipment.Overhead cranes are used in the initial construction of paper machines as they facilitate the installation of heavy cast iron paper drying drums and other large equipment, some of which weigh up to 70 tons.In many cases, the cost of overhead cranes can be largely offset by the savings in not renting mobile cranes in the construction of facilities that use a lot of heavy process equipment.


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