In the entire process of steel structure construction, as a steel structure manufacturer, every link can not be ignored. Here we introduce in detail the lofting and marking of the steel structure:

Lofting is the first process in the steel structure production process, according to the shape and size of the product construction detail drawing or zero, parts drawing requirements, according to the 1:1 ratio of the product or zero, parts of the solid drawing on the lofting table or plate, to obtain the real length and make a template process.

Hot rolled section steel usually does not show distortion buckling during relofting. However, the cold-rolled components usually used are not as stable as the hot-rolled components, and are prone to secondary torsion and deflection. Therefore, steel structure companies will design by purlins and trusses to support the entire structure to prevent the occurrence of the above situation. The support system of steel structure engineering needs to provide stability for cold-formed steel components, and the requirements of cold-formed steel components on the support system will be relatively low, and this process can be predicted in advance.

Lofting content: check the installation size and hole distance of the drawing; Release nodes in a 1:1 scale; Check the dimensions of each part; Make templates and sample rods as the basis for cutting, bending, milling, planing, hole making and other processing. Use 0.50 ~ 0.75mm iron sheet or plastic board to make the template, use wood rod, steel sheet or flat iron to make the sample rod, when the length is short, the wooden ruler rod can be used. The sample rod and sample shall be properly stored and destroyed until the completion of the project. Machining allowance 3 ~ 5mm(welding shrinkage, cutting, milling end), allowable deviation ±1mm.

At present, most manufacturers use numerical control technology for lofting and marking, and then talk about marking (marking).

Marking (marking) : according to the template, draw the real sample of the member on the steel, and mark various processing marks to prepare for the cutting of the steel. Job content: check and verify materials; Mark cutting, milling, planing, bending, drilling and other processing positions on the material, punch the holes, mark the number of the parts, etc. Centralized marking method, nesting method, statistical calculation method, unified marking method of residual material

Marking (marking) acts as a support for beams and purlins and can resist the longitudinal load applied to the steel structure engineering panel. Without purlins to support the roof panels, trusses supporting the wall panels can deform and reduce reliability when pressure on the walls or roof panels distorts or bends the web and flanges of the secondary frame.

Steel structure buildings have more and more appeared in the public's vision, has been more and more recognized and accepted by people. For the specific structural mode of this kind of building, and the role of the frame members, many people do not understand very well, and even the internal personnel of the steel structure company may not all eat thoroughly. In the entire steel structure project, purlins and trusses serve as support points to help customers evaluate and accept, but also to help the internal personnel of steel structure manufacturers, more fully understand that in the entire process of production, every link is very important.