门式起重机常用于码头、海港、仓库和堆场等货物集散点供搬运或装卸作业应用。它们有以下主要特点: 1.常用于露天作业,有高大的门架结构,承受较大的风载荷。例如瑞典南部港口马尔默某造船厂的门式起重机,起重能力为1500吨,跨距174米,提升高度105米,主梁高14.5米。一般中等跨度的双悬臂门式起重机,主梁长度也常达50米左右,梁高超过2米,起升高度超过10米。一台起重量为10吨、跨度35米、 Gantry cranes are commonly used at the terminals of warehouses, seaports, warehouses and yard dumps for cargo handling or loading and unloading operations. They have the following main features: 1. Commonly used in open-air operations, a tall gantry structure, to withstand greater wind loads. For example, a gantry crane at a shipyard in southern Malmo, Sweden, has a lifting capacity of 1,500 tons, a span of 174 meters, a lifting height of 105 meters and a main girder of 14.5 meters. Generally mid-span double cantilever gantry crane, the main beam length is often up to 50 meters, beam height over 2 meters, lifting height of more than 10 meters. A lifting capacity of 10 tons, 35 meters span,