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目前,国内已有的自升式塔机的液压加节装置大都是在每个塔身标准节上焊有踏爪,安装于套架上的油缸通过横梁沿踏爪逐级上升,将套架顶起,而实现加节的,见图1。这种结构的缺点在于:每个塔身标准节上都须焊有一定数量的踏爪,因而加大了标准节的制造费用和难度;对于二次顶升的塔身标准节,若标准节高度为H,踏爪上下距离为h,则须有H=2h。在油缸第一次顶升过程中,其有效行程S′只能等于h。而在油缸第二次顶升时,为使标准节能有充足的空间加进,则油缸行程S″必须大于h(一般S″≥h+100～200mm)。所以,所设计油缸行程S必须大于或等于S″,即S≥S″。因而造成了第一次顶升过程中油缸
At present, the existing hydraulic jacking devices for self-erecting tower cranes are mostly welded on the standard sections of each tower body. The cylinders mounted on the racks are stepped up along the stepping claws by the crossbeams, and the racks are raised step by step. To start up, and to achieve the increase, see Figure 1. The disadvantage of this structure is that a certain number of claws are welded on the standard section of each tower, thus increasing the production cost and difficulty of the standard section; for the standard section of the second lifting tower, if the standard section The height is H, and the distance between the upper and lower jaws is h, then H = 2h. During the first lifting of the cylinder, its effective travel S′ can only be equal to h. When the cylinder is jacked up for the second time, the cylinder stroke S′′ must be greater than h (generally S′′≥h+100 to 200mm) in order to allow sufficient space for standard energy-saving. Therefore, the designed cylinder stroke S must be greater than or equal to S′′, ie, S≥S′′. As a result, the cylinder was raised during the first lifting process.