塔式起重机的塔身与塔帽常采用接头式(销轴受力,见图1a),或法兰盘式(螺栓受力,见图1b)连接。前者制造简单、方便;后者结构更合理,且越来越广泛地用于塔机部件的连接。 在制造和修理过程中,由于存在焊接变形,使法兰盘平面度超差而装配困难,严重影响修造质量,法兰盘焊后变形的情况如图2所示。 为减少焊后变形,应从设计和制造方面采取预防措施,出现变形时要进行矫正。 在设计法兰盘加强筋时,应考虑 Tower cranes and tower caps are often used joint type (pin force, see Figure 1a), or flange (bolt force, see Figure 1b) connection. The former is simple and easy to manufacture; the latter has a more rational structure and is used more and more widely for the connection of tower crane components. In the manufacturing and repair process, due to the existence of welding deformation, flange flatness over the poor and difficult to assemble, seriously affecting the quality of construction, flange deformation after welding shown in Figure 2. In order to reduce the post-weld deformation, preventive measures should be taken in the design and manufacture of the product. Deformation should be corrected. In the design of flange stiffener, should be considered