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1971年我单位引进日本KUBOTA20吨轮胎式起重机一台。该机臂杆为格构式结构,长12米,分三节,每节长4米,用法兰螺栓连接(每节点一个M28螺栓)。该机最大起重量为20吨,此时最大起吊高度仅12.2米。该机原有起重特性曲线见图1。
In 1971, our company introduced a Japanese KUBOTA 20-ton tire crane. The boom is a lattice structure with a length of 12 meters and is divided into three sections. Each section is 4 meters long and is connected by flange bolts (one M28 bolt per node). The maximum capacity of the aircraft is 20 tons. At this time, the maximum lifting height is only 12.2 meters. The original lifting characteristic curve of the aircraft is shown in Figure 1.