门式提升平台又称门式提升架,或简称龙门架,是一种构造简单、制作容易、拆装方便的垂直运输设备。门式提升平台起重量一般为1～2吨,门式架高度在30米以内较为常见,适合中小型工程使用,在各地都应用得较为广泛。门式架的立杆,长细比较大,故稳定性稍差。但若采取逐段接高的方法组装,增加缆风绳,并与建筑物加强连接,也可以达到较高的高度。在一些地区, Door-type lifting platform, also known as gantry lift frame, or simply gantry frame, is a vertical transport device that is simple in construction, easy to make, and easy to disassemble. The lifting weight of the gantry lifting platform is generally 1-2 tons, and the height of the gantry is less than 30 meters. It is suitable for small and medium-sized projects and has been widely applied in various places. The poles of the gantry have a relatively large length and are less stable. However, if a piece-by-piece method is used to assemble and increase the cable wind rope and strengthen the connection with the building, it can also reach a higher height. In some areas,