The first is the design process. At present, China has no special requirements for the design units of tower cranes, that is, there is no design license management. In addition to large enterprises can design and develop new tower cranes, small and medium-sized enterprises basically rely on scientific research institutes to design 名媛直播. At present, the design standards on which designers are based are mainly "Tower Crane Design Code" (GB / T13752-1992), "Crane Design Code" (GB / T3811-2008) and "Tower Crane" (GB / T5031-2008) Standards, of course, must first comply with the requirements of "Tower Crane Safety Regulations" (GB5144-2006), the first two standards are based on the tower crane's utilization level and load status to determine its working level, and then according to the working level, utilization Design and calculate the grade and the range of the number of stress cycles, and the stress cycle and the working cycle have a certain relationship, and then the working life of the tower crane is converted into the estimated service life of the tower crane, that is, the tower crane. The design life of the tower crane, that is to say, the tower crane will have a design life when designing, the design life of the tower crane is the basis of the service life. Why the design life of the tower crane is recommended to be calculated from 15 to 30 years, because the design life is not as long as possible, but also consider whether the manufacturing process can be achieved, consider factors such as economic value, safe use, and technical updates. Without considering the manufacturing and use links, whether the overall design structure is reasonable, whether the materials used meet the design calculation conditions, the structural treatment of the connection parts and the appropriate selection of the connection parts will have a great impact on their life.
The second is the manufacturing process. Whether the manufacturing process of the tower crane is advanced, whether the quality control in the manufacturing process is in place, whether the defect handling and preventive measures are reasonable are important factors that affect the quality of the tower crane, and are also the three key factors for the manufacturing process to meet the design requirements.
The last step is to use it. The correct use of the tower crane is also important. The use here also includes the disassembly and transportation of the tower crane, which is very easy to deform or damage the components. Especially during transportation, due to ultra-long, ultra-wide and ultra-high collision deformation, unreasonable force deformation of the lifting point position and binding when lifting components, deformation and increased stress of structural parts caused by failure to install according to the process, These will affect the strength of the structural parts and even the life. In addition, the correct operation will also affect the life of the tower crane. Tower cranes do not operate in accordance with the operating regulations, such as cable-stayed diagonal cranes, overloading, anti-vehicles, overstepped gear shifts, etc. will affect it. Only when the actual usage of the tower crane is basically in line with the situation estimated at the time of design, together with normal maintenance, can the design life of the tower crane be guaranteed and extend its service life.
