According to the "Announcement of the Ministry of Construction on the Promotion, Application and Restriction of Prohibited Technologies (First Batch) during the Eleventh Five-Year Plan for Construction" (No. 659), the construction of tower cranes (TOWER CRANE) The service life is as follows:
1. The following three types of tower cranes can continue to be used only after they have passed the evaluation by a qualified evaluation agency:
1. 630kN.m Tower cranes below (excluding 630kN.m) and with a factory age of more than 10 years (excluding 10 years);
2. 630~1250kN.m (excluding 1250kN.m) and with a factory age of more than 15 years Tower cranes that are more than 1250 kN.m years old (excluding 15 years);
3. Tower cranes that are above 1250kN.m and have a factory age of more than 20 years (excluding 20 years).
2. If the service life specified in the tower crane instruction manual is less than the above provisions, the service life specified in the instruction manual should be followed.
3. In addition to the complete machine, the scrap regulations for the main load-bearing structural parts of the tower crane should be in accordance with Article 4.7 of the "Safety Regulations for Tower Cranes" (GB5144-2006): "Scrap and Working Life of Structural Parts" regulations are implemented.
Tower crane is the most commonly used lifting equipment on construction sites, also known as "tower crane". It is used to lift the length (height) of one section (referred to as "standard section"). Construction raw materials such as steel bars, corrugated wood, concrete, steel pipes, etc. Tower crane is an essential piece of equipment on the construction site.
According to records, the first patent related to tower cranes for construction was issued in 1900. In 1905, a crane with a fixed tower body and a jib appeared. In 1923, a prototype of a modern tower crane was made. In the same year, the first relatively complete modern tower crane appeared. In 1930, Germany had begun mass production of tower cranes and used them in construction. In 1941, the German industrial standard DIN8770 for tower cranes was announced. The standard stipulates that the lifting capacity of the tower crane is expressed as the gravity moment as the product (tm) of the hoisting load (t) and the amplitude (m).
Baidu Encyclopedia-Tower Crane