Portal scaffold is one of the most widely used scaffolding in construction scaffolding. Because the main frame is "door", it is called a door or door scaffold, also known as a scaffold or a Longmen rack. The scaffold is mainly composed of main frame, horizontal frame, oblique bracing, foot plate and adjustable base. The portal scaffold was first developed by the United States. It has the characteristics of simple disassembly and assembly, good bearing capacity, safe and reliable use, and develops rapidly.
By 60s, such scaffolding had been introduced and carried out in Europe, Japan and other countries.
70年代以来，我国先后从日本、美国、英国等国度引进门式脚手架体系，在一些高层建筑工程施工中应用。它不但能用作建筑施工的内外脚手架，又能用作楼板、梁模板 支架和挪动式脚手架等，具用较多的功用，所以又称多功用脚手架。门式脚手架是美国在五十年代末首先研制胜利的一种施工工具。由于它具有装拆简单、挪动方 便、承载性好、运用平安牢靠、经济效益好等优点，所以开展速度很快。至60年代初，欧洲、日本等国度先后应用并开展这类脚手架，在欧洲、日本等国度，门式脚手架的运用量最多，约占各类脚手架的50%左右，并且各国还树立了不少消费各种体系门式脚手架的专业公司。我国从70年代末开端，先后从日本、美国、英国等国度引进运用这类脚手架，在一些高层建筑工程施工中应用，获得较好的效果。
Since the 1970s, China has introduced the portal scaffolding system from Japan, the United States, the United Kingdom and other countries, in some high-rise building construction applications. It can not only be used as inside and outside scaffolding in construction, but also as floor slab, beam formwork support and movable scaffolding, so it is also called multi-function scaffolding. The portal scaffold is a construction tool developed by the US in the late 50s. Because it has the advantages of simple assembly and disassembly, easy movement, good bearing capacity, safe and reliable use, good economic benefits, so the development speed is very fast. To the early 1960s, Europe, Japan and other countries have applied and carried out this kind of scaffolding, in Europe, Japan and other countries, the use of portal scaffolding is the largest, accounting for about 50% of all types of scaffolding, and many countries have established a variety of consumer systems of professional scaffolding companies. Since the late 1970s, China has introduced and applied this kind of scaffolding from Japan, the United States, the United Kingdom and other countries, and has achieved good results in the construction of some high-rise buildings.
到了80年代初，国内有一些和消费厂家开端仿制门式脚手架，直到1985年以后，已先后树立了10家 门式脚手架消费厂，门式脚手架在局部地域的施工工程中，开端大量推行应用，并且得到了广阔施工单位的欢送。但是，由于各厂的产品规格不同，质量规范不一 致，给施工单位运用和管理工作带来一定艰难。同时，由于有些厂采用钢管的材质和规格不契合设计请求，门架的刚度小，重量大，运输和运用中易变形，加工精度 差，运用寿命短，致使严重影响了这项新技术的推行。
By the early 1980s, some domestic and consumer manufacturers began to imitate the door scaffolding, until 1985, has set up 10 door scaffolding consumer factories, door scaffolding in local construction projects, began a large number of implementation and application, and has been widely welcomed by construction units. However, due to the different product specifications and quality specifications of different factories, it is difficult for the construction units to use and manage. At the same time, some factories use steel pipe material and specifications do not meet the design requirements, portal frame stiffness is small, heavy weight, easy to deformation in transportation and operation, poor processing accuracy, short service life, resulting in a serious impact on the implementation of this new technology.
By the 1990s, this scaffold has not been carried out, but less and less used in construction, many gate scaffolding factory closed or changed production, as long as a few units with good processing quality continue to consume. Therefore, it is necessary to separate the architectural characteristics of our country and develop a new portal scaffold.
标签:   脚手架 门式脚手架 脚手架厂家 梯形脚手架 移动脚手架