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1.前言在最近的建设工程中,为了满足缩短工期、节减经费、确保安全等要求,施工计划中准备采用超大型起重机者有所增长。随着工程规模的增大,起重机也向大型化发展。今天连150吨级的起重机也已是常用的机型了。世界上的超大型起重机,如美国门尼托沃克(Manitowoc)公司的“环道型”和美国卷扬机与桅杆吊公司(Amhoist)的“天马型”等是在基型机上装大型环形滚道、配重块或特殊的装置,从而使基型机的起重能
1. Introduction In recent construction projects, the number of construction cranes preparing for the use of very large cranes has increased in order to meet the requirements of shortening the construction period, reducing expenses and ensuring safety. With the increase of the scale of the project, cranes have also been developed to large-scale. Today, even 150-ton cranes are also commonly used models. The huge cranes in the world, such as the Manitowoc “Ring Road” in the United States and the “Amazons” of the United States Amhoist, etc., are all equipped with large annular raceways on the mainframe, Counterweight or special device, so that the lifting capacity of the base machine