FZQ1250型自升式起重机额定起重力矩为1 25×10~5N·m,额定起质量为50t。塔身为圆筒式结构,伸臂铰点位于回转中心后方,整个回转机台套在由上环梁、固定压道、上压道组成的回转支承外(以下简称固定压道组件),简体顶部封头,回转支承套在简体外,上部由8组拉板与封头连接。起重机上部结构悬挂在封头上, FZQ1250 jack-type crane rated lifting torque of 1 25 × 10 ~ 5N · m, rated from the quality of 50t. The tower body is in the form of a cylinder. The hinge point of the boom is located behind the center of rotation, and the entire revolving machine is sleeved outside the slewing ring consisting of the upper ring beam, the fixed labyrinth and the upper labyrinth (hereinafter referred to as the fixed laden assembly) Top head, slewing bearing sleeve in the simplified, the upper part of the group by eight pull plate and head connection. Crane superstructure suspended in the head,