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The development of portal scaffolding at home and abroad

by:Shizhan     2020-09-19
Portal scaffolding is one of the most widely used scaffolding in construction. Because the main frame is in the shape of 'door', it is called gate-type or gate-type scaffold, also called scaffold or gantry. This kind of scaffolding is mainly composed of main frame, horizontal frame, interspersed diagonal brace, scaffold board, adjustable base and so on. The portal scaffolding was first developed by the United States. It has the characteristics of simple disassembly and assembly, good load-bearing performance, safe and reliable use, and the development speed is very fast.

By the 1960s, countries such as Europe and Japan successively introduced and developed this kind of scaffolding.

Since the 1970s, my country has successively introduced portal scaffolding systems from Japan, the United States, and the United Kingdom, and applied them in the construction of some high-rise buildings. It can be used not only as internal and external scaffolding for construction, but also as floor slab, beam formwork support and mobile scaffolding. It has more functions, so it is also called multi-function scaffold. Portal scaffolding is a construction tool first developed by the United States in the late 1950s. Because it has the advantages of simple assembly and disassembly, convenient movement, good carrying capacity, safe and reliable operation, and good economic efficiency, the development speed is very fast. By the early 1960s, countries such as Europe and Japan have successively applied and developed this type of scaffolding. In Europe, Japan and other countries, portal scaffolding is used the most, accounting for about 50% of all types of scaffolding, and many countries have also established many A professional company that produces portal scaffolding of various systems. Since the end of the 1970s, my country has successively introduced and used this type of scaffolding from countries such as Japan, the United States, and the United Kingdom, and applied it in the construction of some high-rise building projects with good results.

In the early 1980s, some domestic and consumer manufacturers began to imitate portal scaffolding. After 1985, 10 portal scaffolding factories had been established. Portal scaffolding began to be widely used in local construction projects. Won the farewell of the vast construction unit. However, due to different product specifications and inconsistent quality specifications of each factory, it has brought certain difficulties to the construction unit's operation and management. At the same time, because some factories use steel pipe materials and specifications that do not meet the design requirements, the rigidity of the mast is small, the weight is large, it is easy to deform during transportation and use, the processing accuracy is poor, and the service life is short, which seriously affects the implementation of this new technology. .

In the 1990s, this kind of scaffolding was not developed. Instead, it was less and less used in construction. Many gantry scaffolding factories were closed or converted, as long as a few units with good processing quality continued to consume. Therefore, it is necessary to separate the architectural characteristics of our country and develop a new type of portal tripod.
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