论文部分内容阅读
塔吊是建筑施工中应用最广的一种重要的起重吊装机槭,威力巨大,人们往往称它为建筑工地上的“铁臂巨人”。从1953年起,我国在城市建设中开始使用塔吊。三十年来,塔吊行业有了很大发展。目前,各种类型的塔式起重机遍布全国大大小小的建筑工地。据不完全统计,全国塔吊的总数量约为4500台左右。它们基本上可以分为三大类,即快速拆装下旋转塔吊、普通上旋转塔吊和自升塔吊(见图)。
Tower cranes are the most widely used type of hoisting cranes in construction. They are very powerful and people often call them “iron arm giants” on construction sites. Since 1953, China has begun to use tower cranes in urban construction. In the past 30 years, the tower crane industry has made great progress. At present, various types of tower cranes are spread over large and small construction sites throughout the country. According to incomplete statistics, the total number of tower cranes in the country is around 4,500. They can basically be divided into three major categories, ie, quick-dismounting under rotating tower cranes, conventional upper rotating tower cranes, and self-elevating tower cranes (see figure).