规定了安全使用桥梁、龙门、门式起重机（包括集装箱起重机）、起重臂和单轨起重机的最低要求。它还规定了上述类型起重机的规划、选择、选址、安装和拆卸、操作、维护、检查和维修的要求。

Specifies the minimum requirements for the safe use of bridge, gantry, portal (including container cranes), jib and monorail cranes. It also specifies requirements for planning, selection, siting, erection and dismantling, operation, maintenance, inspection and repair of the above types of cranes.