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具有较大幅度的水平变幅固定式自升塔机正越来越多地取代轨行下旋式塔机。和轨行式塔机的十字型底架相比,固定式塔机的底架轻巧得多,它通过地脚螺栓和压板牢固地固定在基础上。国内生产的自升塔机的塔身根部一般都装有四根斜撑杆,一方面使塔身、底架和斜撑杆三者连接为固定的三角形,同时又使塔身危险断面的位置上移到斜撑杆上支承点处。危险断面位置的提高减少了此断面的内力,又缩短了塔身的计算长度,无疑是十分有利的。我们在对QTZ40自升塔机进行测试时,曾在斜撑上支承点
More substantial level of horizontal luffing fixed jacking tower is more and more replaced by rail spin down tower crane. In contrast to the cross-type undercarriage of a rail tower crane, the undercarriage of a fixed tower crane is much lighter and is firmly fixed to the foundation by anchor bolts and platens. Domestic production of the tower crane body tower roots are generally equipped with four diagonal struts, on the one hand the tower, chassis and diagonal rods connected to the three fixed triangle, while the tower dangerous cross-section of the location Move up to the diagonal strut on the bearing point. Increasing the location of the dangerous section reduces the internal forces of this section and shortens the calculated length of the tower, which is undoubtedly very beneficial. We tested the QTZ40 self-elevating tower crane on the bracing support points