Portal scaffolding is one of the most widely used scaffolding in construction scaffolding. Because the main frame is a “door” type, it is called a door type or door type scaffolding, also called a scaffold or a gantry. The scaffolding is mainly composed of a main frame, a horizontal frame, a cross bracing, a scaffolding plate, an adjustable base and the like. The door scaffolding was first developed by the United States. It has the characteristics of simple disassembly and assembly, good bearing performance, safe and reliable use, and its development speed is very fast.

In the 1960s, countries such as Europe and Japan introduced and developed such scaffolding.

Since the 1970s, China has introduced portal scaffolding systems from Japan, the United States, the United Kingdom and other countries, and applied it in the construction of some high-rise buildings. It can be used not only as an internal and external scaffold for building construction, but also as a slab, beam formwork bracket and mobile scaffolding. It has many functions, so it is also called multi-functional scaffolding. Portal scaffolding was a construction tool first developed by the United States in the late 1950s. Because of its advantages of simple assembly and disassembly, convenient movement, good load bearing, safe and reliable use, and good economic benefits, it has developed rapidly. In the early 1960s, Europe, Japan and other countries successively applied and developed such scaffolding. In Europe, Japan and other countries, the use of portal scaffolding is the most, accounting for about 50% of all kinds of scaffolding, and many countries have established a lot. A professional company that produces a variety of system door scaffolding. Since the end of the 1970s, China has introduced such scaffolding from Japan, the United States, the United Kingdom and other countries, and applied it in some high-rise construction projects, and achieved good results.

In the early 1980s, some domestic manufacturers began to imitate door-type scaffolding. Until 1985, 10 door-type scaffolding factories have been established. The door-type scaffolding has been widely promoted and applied in some areas of construction. It has been welcomed by the majority of construction units. However, due to the different product specifications of each factory, the quality standards are not consistent, which brings certain difficulties to the construction unit’s use and management. At the same time, because some factories use steel pipes with materials and specifications that do not meet the design requirements, the gantry has small rigidity, large weight, easy deformation during transportation and use, poor processing accuracy and short service life, which seriously affects the promotion of this new technology.
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In the 1990s, such scaffolding was not developed, and the application in construction was becoming less and less. Many door-type scaffolding factories were closed or converted, and only a few units with good processing quality continued to produce. Therefore, it is necessary to develop a new type of door type tripod based on the characteristics of Chinese architecture

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