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四川省建工局根据工程建设的需要,组织了老工人、领导干部和技术人员三结合小组,在重庆建筑工程学院的协助下,将一台40吨塔吊改装成400吨塔桅起重机(见附图)。400吨塔桅起重机是在40吨塔吊的龙门架下,增装四根断面为500×300毫米的箱形结构组成的台车,台车两端采用铰接形式与平台连成一体,平台可以装在台车的左右两侧。平台上安装两根断面为1500×1500毫米,长55米重47吨的桅杆,起重时以四台20吨卷扬机作动
In accordance with the needs of project construction, the Sichuan Construction and Industry Bureau organized a three-in-one team of old workers, leading cadres and technicians. With the assistance of the Chongqing Institute of Civil Engineering and Architecture, a 40-ton crane was converted into a 400-ton tower crane (see attached Figure). The 400-ton tower crane is under the gantry structure of a 40-ton crane, and it is additionally equipped with four trolleys with a box-shaped structure with a section of 500×300 mm. The two ends of the trolley are connected to the platform in an articulated form, and the platform can be installed. On the left and right sides of the trolley. Two masts with a section of 1500 x 1500 mm and a length of 55 meters and a weight of 47 tons will be installed on the platform. When lifting, four 20-ton hoists will be used to operate the mast.