First, the quality of steel works with a variety of raw materials, there will be various modifications, prefabricated steel structure project will appear in a variety of geometries bias. Such as bending, uneven and not perpendicular to the other needs correction, often used to correct engineering heating correction, corrected heating zone members will appear embrittlement scene. Material cutting or welding process the Central Standing Committee member of various complex deformation, such as: twists, such as distortion and warpage. Vertical deviation is too large pillars and capitals elevation below the design elevation. Senior steel works, steel works in the Central Standing Committee appeared column assembly foot plate gap is too large or difficult horn arrangement. Will find layers of column spacing is too large or too small scene, search the top layers of the beam, often find the top ends of the beam elevation inconsistent. Carrying out structural search of acceptance, steel works after installation is complete. Issue axis displacement often steel, vertical deviation is too large pillars and capitals elevation below the design elevation. Senior steel works, but also found the layers column spacing is too large or too small scene, search the top layers of the beam, often find the top ends of the beam elevation inconsistent. Affect the identity of steel works quality. Second, the steel material issue material is uneven, due to the current market, many manufacturers of steel supply. Material procurement little attention will be material or material failure and various modifications exceeded, transportation of raw materials, stacking and storage process, due to the collision and extrusion, the material appeared various modifications, the most common, such as: steel unyielding , steel and turns, not perpendicular angle or channel, beam flange on the web is not vertical like. These deformations not only to correct the difficult, and some can not even perform corrections, have a serious impact on the quality of construction. Steel prefabricated steel construction issues, a model of dimensional accuracy and sophistication cutting line cutting use will directly affect the quality of the steel structure prefabricated construction program component size, steel production in the pre-construction. At the same time cutting and cutting should allow sufficient allowance. From raw materials, after cutting member to preform molding, corrections and shaping the steel construction throughout every step of the process. If embarrassed Organisation correct process, the next step of the construction will not be guaranteed. Correct style pattern varied, often adopted in accordance with the specific circumstances, but the heating is one of the most common correction means which, due to the heating temperature is too high, the material often leads to the occurrence of the material change, and often use forced cooling water after heating, Even heating zone to produce hot brittle phenomenon. Plates, profiles due to the length restricted. Because of the self-test disassembly, spliced ??between the various processes the order is unreasonable or not strict, and often not even too large deformation correction. Because node does not match, the rift is too large or splicing process is unreasonable. Member is in the stitching. Often resulting in a total length after stitching prefabricated structure distortion. After making the mosaic structure span splice ban. Scantlings stitching or a small spell before the members are not allowed to cumulative deviation is too large. After the completion of steel or precast. Arising as a result of the collision died bend; stacking, because the pad layout is unreasonable point or altitude settlement produce death or slow bend bend. Steel mounting feet because of the identity of the weld large steel columns or posts too thin steel plate attic, foundation elevation deviation is too large or is not leveled foundation details will directly affect the assembly level, the verticality of the column, the number of horns and superimposed horn length. At the same time. Welding process contraction deformation, so that the bottom plate warping, thus affecting the quality of the column assembly. Often resulting position error column axis. Position deviation position foundation anchor bolts or studs are not allowed floor bolt hole is too large. Because the underlying structure capitals axis when the unit has shifted steel construction, high-rise steel structure installation. Fulfilling base structure assembly, in order to ensure consistent up and down the column axis, the following layer column centerline axis of the upper column as a baseline installation, making the grassroots capitals axis deviation is too large. Shall promptly assembling prefabricated structural components or installing fulfill proofreading and permanent steel structure design flow Dongguan | Zhongshan Steel | Steel Ltd. Peng Jian Peng built by Steel City. Steel Co., Ltd., Dongguan City, Peng Jian (dgpengjian.cn) strong, credible, in Dongguan, Guangdong steel industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Peng built into the brilliant steel and you work for a better future!