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建筑物正在向中高层发展,为满足施工的需要,我们在原 QT_D20塔机的塔身下端以加标准节的方法来提高其起吊高度。在标准节高度增加不大的情况下(3～6米),只要增加必要的基础配重,加大增加节断面或钢管壁厚,加强最下端联接件,则验算表明这种方法是安全可行的。但加高塔身却带来了一个棘手的安装问题。QT_D20塔机是上回转固定式,安装时用主卷扬机通过起落架整体竖塔(见图1)。由于加入标准节,使得塔身重心右移,重量
The building is being developed to the middle and high-rise buildings. To meet the needs of construction, we have used the standard section method to increase the lifting height of the tower of the original QT_D20 tower crane. In the case where the height of the standard section does not increase significantly (3 to 6 meters), as long as the necessary basic weight is increased, the section thickness of the section is increased, or the wall thickness of the steel pipe is increased, and the lowermost link piece is reinforced, the verification indicates that this method is safe and feasible. of. However, the height of the tower has brought a thorny installation problem. The QT_D20 tower crane is fixed on the upper swing, and it is installed with the main winch through the entire vertical tower of the landing gear (see Figure 1). Due to the addition of the standard section, the weight of the tower body is shifted to the right and the weight