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一、引言七十年代至八十年代初,我国生产了为数不少的动臂式塔机(以上称旧塔机),对建筑施工起了很大的作用。现在,这些塔机多数还在施工中发挥作用。但今天看来无论是结构性能,还是安全保护装置的配备,越来越难以适应现代施工的需要。即使是中、小型的塔机,目前售价少则7～8万,多则20多万元,作为一个企业,决不可能将这些旧塔机采取简单报废、重新购置的办法,旧塔机
I. INTRODUCTION In the 1970s and early 1980s, China produced a large number of boom-type tower cranes (referred to as old tower cranes above), which played a significant role in building construction. Most of these tower cranes are still playing a role in construction. However, today it seems that both structural performance and the provision of safety protection devices are increasingly difficult to adapt to the needs of modern construction. Even small and medium-sized tower cranes currently sell for as little as 7 to 80,000 yuan and as many as more than 200,000 yuan. As a company, it is impossible to adopt simple methods of scrapping and repurchasing old tower cranes.