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塔式起重机(也叫塔吊)在国外贮木场作业中应用的很多。例如,苏联贮木场的木材归楞、装车和出河作业中所采用的塔吊数量多于装卸桥,有数万台。它与装卸桥相比有以下特点:由于装卸桥的跨距大(40—60米),所以装卸桥运行时不同步现象普遍存在。这样就造成了钢结构受力情况不良,大车轮磨损严重,减少了使用年限。而塔吊的跨距(10米左右)小,所以不存在这样的缺点。其次装卸桥只适应于场地规则,最好是矩形的场地条件,而塔吊不仅适于宽大、规则
Tower cranes (also known as tower cranes) in the operation of foreign wood yard applications are many. For example, there are tens of thousands of cranes used in loading and unloading timber in the Soviet Union yard than in the loading and unloading bridges. Compared with the loading and unloading bridge, it has the following characteristics: Due to the large span of the loading and unloading bridge (40-60 meters), the phenomenon that the loading and unloading bridge runs out of synchronization is ubiquitous. This will result in poor steel structure, the serious wear and tear of the wheel, reducing the useful life. The tower crane span (10 meters) small, so there is no such drawback. Second, only to adapt to the loading and unloading bridge site rules, it is best rectangular site conditions, while the tower crane is not only suitable for lenient rules