高层建筑施工的特点是层次多,高度高,上部施工影响范围大;四周场地相对狭小,设备集中,人员活动频繁。因此施工外脚手的选用,是高层建筑施工中必须首先考虑的重要问题之一。层次多,高度高,不但增加操作人员心理上的危险感,在操作上也确实增加了发生事故的可能性,因此必须有安全可靠的防护设施。此外,为满足施工需要,沿建筑物四周活动的人员,也远较一般工程集中和频繁。层次增多,上部操作人员增加,以及一些难以预料的因素,都会增加高空物体坠落的可能,也给被影响范围内的人员和设施带来了遭受打击的可能。这些问 The construction of high-rise buildings is characterized by multiple levels, high heights, and a large range of upper-level construction; the surrounding areas are relatively narrow, equipment is concentrated, and personnel activities are frequent. Therefore, the selection of construction outsiders is one of the most important issues that must be considered first in the construction of high-rise buildings. Many levels and high heights not only increase the psychological danger of operators, but also increase the possibility of accidents in operation. Therefore, it is necessary to have safe and reliable protection facilities. In addition, in order to meet the construction needs, people who move around the buildings are also far more concentrated and frequent than the general works. The increase in levels, the increase in the number of upper operators, and some unforeseeable factors will increase the likelihood of falling objects at high altitudes, as well as the possibility of hitting people and facilities within the affected area. These questions