Frame scaffolding was invented in 1946 by the two brothers Bill Ashenfelter and Jack Ashenfelter, the founders of the American bil-jax company. The invention patent rights of the product were sold to Wilbur Wyse in 1947 together with the bil-jax company. , and began production and sales in the same year. Frame-type scaffolding has been greatly utilized by two generations of father and son Wilbur Wyse and Steven Wyse due to its many advantages such as simple installation and disassembly, reliable safety performance, and significant economic benefits, and has quickly become popular in the United States.
Later, it spread to many countries and regions such as Europe, South America, the Middle East, Japan, Southeast Asia and China. When bil-jax's patent protection period expired, several companies in the United States took the lead in producing and selling their own styles of frame-type scaffolding, resulting in products from different companies being incompatible with each other. The purpose is to cultivate a user base that is loyal to its own products, because each user will accumulate a large amount of inventory, which objectively makes users unwilling to switch to other companies' products. The more famous of these companies include Waco, Safway, Gadsden, Mighty, Vanguard, etc. Some of these companies have become listed companies or subsidiaries of listed companies, and some have gone bankrupt and exited the market.
For example, the Mighty company has gone bankrupt, but because its past user base still has a large inventory, Might style masts still have a large user base in the southeastern United States, and other companies have switched to And manufacture products of that style for users. Our company maintains close business cooperation with the above-mentioned companies, customizes products for them that fit their own styles, and maintains good personal relationships with the senior executives of these companies. Different styles based on the design of bil-jax have resulted in three types of column steel pipe diameters currently used on the market: 1.69", 1.625" and 1.5", and there are more than a dozen styles of pins for fixing the diagonal tie rods. The positions of the pins on the columns are also different. The openings of the inclined tie rods on the columns are 48", 42", 36", etc. The most common products are 5'Wx5'H ladder frame and 5'Wx6 '4"H portal frame, etc.
These products spread to the United States to Europe, Japan, Southeast Asia and China, and the size was changed from the imperial system to the metric system. However, because they were directly transferred from the imperial system, their specifications changed It is very interesting and irregular. For example, the gantry racks used in Japan, Southeast Asia and my country have specifications such as 1524mmWx1930mmH. No matter how the product details of these companies change, it is mostly for the commercial purpose of protecting their own markets, but their product designs are unique. The purpose and scope are the same and have never changed, that is, they are mainly used in places with relatively small loads such as exterior wall construction and decoration. In the United States, this type of frame scaffolding is also called plaster frame (PlasterFrame) and brick. Mason Frame, basically no one will use this type of product in formwork support systems that require relatively high load requirements.
The weight per unit area of ??frame-type scaffolding is lower than that of fastener-type steel pipe frames. 50%, the cost of each disassembly is 1/2 of the steel pipe frame and 1/3 of the bamboo frame. The work efficiency and benefits are very significant, and the higher the building, the better the benefits. These outstanding advantages encourage people. Trying to apply the concept of frame scaffolding to the formwork support system, the support frame was born. To be precise, the support frame is not a portal frame but a ladder frame, which is also determined by its application requirements. Similar to our domestic full-floor scaffolding, there is no need for aisles to pass materials and personnel, and the first requirement is load-bearing capacity. The more famous support frame in the United States is the 10K support frame of Waco Company. It is currently a very popular universal support frame with the smallest load capacity in the American market.
The reason why it is called the 10K support frame is because the design load of the column (Leg) of this product is 10,000 pounds and the design safety factor. It is 4:1, that is to say, its ultimate load is greater than or equal to 40,000 pounds. The column of this product uses 2.3/8” diameter high-strength steel pipe, which achieves a good combination of safety and efficiency and can be used in Many applications where height and load requirements are not very high.
For applications requiring higher load bearing, there is also a specially designed 25K heavy-duty support frame. The design load of the column (Leg) is 25,000 pounds, and the design safety factor is 4:1, that is to say, its ultimate load is greater than Equivalent to 100,000 pounds. In very light support applications, ordinary ladder frames are occasionally used for support, because in developed countries in Europe and the United States, even the lightest ladder frames must be marked with safety standard loads. However, such applications are usually not the most reliable and effective in terms of safety and efficiency. From the naming of 10K support frame and 25K support frame, we can feel that people pay great attention to the load bearing capacity of the support frame.
With the development of science and technology, technology has gradually become mature from a design perspective, and the scaffolding systems widely used in developed countries include: the frame-type scaffolding system first invented by an American company, and the first invented by a British company. Bowl-buckle scaffolding system and the disc-type scaffolding system first invented by a German company. On the basis of these systems, different scaffolding companies in different countries have made slight improvements in some details, but in terms of their principles, there is no fundamental breakthrough. But no matter how science and technology advances and how technology develops, the concepts of the two types of products, scaffolding system and support frame system, have never been confused. The support system's extreme need to safely bear loads, no matter how the inventors and designers of the support system change their designs, the focus on this extreme need has never changed. There is even a very interesting phenomenon in the United States. Scaffolding companies only do scaffolding business, while the support frame business is mostly done by formwork companies. It may be that the application of the support system and the formwork system is too closely integrated.
For more information about engineering/service/purchasing tender document writing and production to improve the bid winning rate, you can click on the official website customer service at the bottom for free consultation: /#/?source=bdzd