Frame scaffolding production and use of time is not long in our country, the research unit of scaffolding planks, each other is not universal, variety specification variety. Some factories copy foreign products, adopt the inch size. Doors scaffold So far there is no uniform design and product standards product specification is different, quality is not consistent. Not only to bring considerable difficulties in the use and management of construction unit, is not conducive to popularization and application, at the same time, also brings to the construction safety hidden trouble.

So, it should as soon as possible to organize the formulation of unified standard and issue the doors scaffold. In the gantry scaffolding planks standardization, the main problems are:
Main components of the specifications of the size of the specifications of the various countries in the world door scaffold size is various, has adopt the international unit and English two kinds of measurement units.

Such as English unit width is 4 '1219 type door frame (1219 mm), height is 6' 4 "(1930 mm), type 1219 international units of the width of the door frame is 1200 mm, height is 1900 mm. The door frame width of scaffolding companies in foreign countries mainly 900, 914, 1200, 1219 mm, the size of the door frame height a lot, become a system oneself.

Specifications several production plants in China is not unified, a generic foreign product specifications, also have domestic research units designed a set of system, adopts the inch size, has adopted the international system of units size.

Such as the width of the door frame is inch size is 1219 mm, the international system of units of 1200 mm, distance is 1829 mm and 1830 mm respectively, and because the size is different, each other between the door frame can't general. And as the height of the door frame size has more than eight, connecting pin spacing between also have a variety of size, a wide variety of causes of the specifications of the cross brace.