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我单位购置的QTZ40B型自升式塔式起重机,其基础为固定式。每次施工完毕拆除塔吊后,基座及8根直径36mm螺栓均告报废,而再施工时,仍要重复浪费工料。为了增加企业效益,加快施工进度,可将固定式塔吊混凝土基础改成预制混凝土基础(图1～4),此举深受工地欢迎。现将具体施工方法介绍如下。一、塔吊预制基础制作经计算原固定基础重量为15.83t,而预制基础重为19.5t;固定基础外廓尺寸每边
QTZ40B self-elevating tower crane purchased by our unit is based on fixed type. After each construction demolition of the tower crane, the base and eight bolts 36mm diameter were scrapped, and then construction, still have to repeatedly waste material. In order to increase business efficiency, speed up the construction progress, the fixed tower crane concrete foundation can be changed to prefabricated concrete foundation (Figure 1 to 4), the move welcomed by the site. The specific construction methods are as follows. First, the tower crane prefabricated basic production was calculated based on the original fixed base weight of 15.83t, while the prefabricated basis weight was 19.5t; fixed basic dimensions on each side