Development of tower cranes

Tower  bridge gantry crane   ( hereinafter referred to as tower crane ) with high efficiency , wide application , turning radius, since elevated high, easy to operate, resistance and easy installation and removal are more features, construction and installation works in our country has been widely use, and as a major construction machinery. In addition to tower cranes used in industrial and civil buildings , but in the power plant construction , water conservancy construction and shipbuilding sectors also often applied .
 
Always start with the basics of industrial and civil construction of a large number of remote layers of building materials to be transported from the ground to the top , the tower crane is complete vertical transport one of the most efficient lifting equipment . Since the tower crane boom mounted on the upper part of the tower , and higher buildings, so it can be installed near the building where it 's effective range is much greater than other hoist gantry crane s , lifting objects so as to direct lifting to the desired position has brought great convenience.

History of the development of tower cranes

In our country, the tower crane production and application of more than 30 years of history , has experienced a mapping from the design and manufacture of generic development process . In the 1950s, in order to meet the needs of economic construction , the introduction of the Soviet Union and the Eastern European countries tower sails. And for imitation . Imitation of the German Democratic Republic in 1954, the architect designed the tower crane type I and trial of China's first TQ2-5 type tower crane . Followed in order to meet power plant construction needs , has modeled on the Soviet -like sails, developed l 5t and 25t tower crane , the period of the production and use of tower cranes are small.
 
In the 1960s , China has entered a self- design and manufacturing stages of the tower crane . In 1961 , a successful trial of Red No. Ⅱ tower crane , which is China's first self-designed tower crane . It now appears that , although its performance is less than the current tower , but because of low cost, easy to use, until there is a certain market boast H . Subsequently, the country also is to design and manufacture TQ6 other tower in 1965 , the country has more than 10 manufacturers , producing tower  steel crane  over 360 units. This is the next time the Ministry of Walled tower crane rotating arm weapons , and can haul a whole , to meet the following six layers civil construction needs.
 
Since the 1970s , as construction needs, our tower crane into the technology improved varieties increased the new stage. 1972 for the construction of the Beijing Hotel , China is also the line design and manufacture of 1 60t · m 's just the type of self-elevating tower crane '1974 Yun Hotel Guangzhou from construction , but also to design and manufacture 40t · m of internal climbing tower from l machines, 1975 in order to meet the needs of infants and high-rise construction in Shanghai to design and manufacture zT-120 attached to the self- liter tower crane . These self-elevating , rotating on a horizontal jib tower crane trolley Empty parcels successful development ,sino hoist so that our tower crane production has entered a new phase. During this period , backspin tower crane new varieties QTl6, QT25, QT45 type. Some use a telescopic boom and folding tower structure, so that construction of the transport length shortened.