Analysis and summary of how to improve the installation accuracy of the main steel structure
In the construction industry, with the use of the main steel structure more and more popular, the main steel structure production, transportation and installation technology has attracted more and more attention, but also get rapid development and continuous improvement. How to improve the production of the main steel structure and installation precision, reduce the cost, is a subject in front of the main steel structure industry. Now the relevant national standards and industry standards have been made in this regard many provisions of parts from the expected completion under each step required.
Hongxing based on many years of practice, in order to improve the installation accuracy of the steel structure of the main considerations, the main links in the production, transportation, installation, must be attach great importance to some of the problems and the specific control method are analyzed and summarized.
The main steel structure production size accurate, is to ensure accurate dimension of the structure and the main steel structure installation smooth basic and precondition. Therefore, it is necessary to accurately grasp such as steel column of straightness and twist, post and beam connection Kong Daozhu floor of the distance, connecting hole machining accuracy, the roof beam straightness and beam column connection tied or support for board processing precision, beam column connection plate relative to the position of the beam to column size, purlin plate position size and so on.
The steel structure of the main body column by outsourcing H steel processing or plate assembly and, if it is a ready-made H type steel processing, are pillars of the production precision is easy to control; if it is made of sheet metal assembly is assembled and welded in to pay attention to the steel column's plastic, to ensure the steel column straightness and prevents twisting. Most of herringbone roof beam structure, often by 2 pieces or 4 pieces assembled. Roof beams generally by the party making plate assembling and and the web of the beam is often irregular quadrilateral, technical ability manufacturers of layout of web material can accurately grasp, and weak technical capacity of manufacturers on the web lofting size but deviation. Due to the dimension of the roof beam, related to the beam to column connection tightness, the web directly affects the size of beam dimensions. Therefore, it is particularly important. In general of the main steel structure design, the roof beam and often a play Arch requirements. Its purpose is offset the overall after installation, beam body for themselves and the roof load and deflection, so just to mounting dimensions. The height of the arch is determined by the design. In order to ensure the camber, the shape and size of the roof beam must be adjusted again. In this aspect, the difficulty of making the beam is much greater than that of the column.
We in the on-site inspection, the beam size and shape the beam end connecting plate on the inspection items, the purpose is to ensure that the overall effect of the installation to ensure tightness between beam and column. We have found that, after the installation of beam and column between the wedge shaped gap, when the large hexagon head bolt has lost the original design of the main role, just to take up the role of supporting and between beam and column of no friction. In order to eliminate the hidden trouble. Later we in each pillar close to the beam connecting plate of the lower side, an increase of shear keys in order to improve the support ability of the roofing system, practice has proved, the effect is very good.
In the actual construction, due to a variety of factors makes between beam and column are often not closely, some seem to be combined, but actually reach requirements, resulting in joint surface between the friction force is relatively weak. In view of this, we hope that in the design of steel structure main body, close to the recommended in the column panel beam connecting plate lower increase in shear key, to ensure that the supporting capacity of columns on the roof. The shear bond is small, but the effect is very big.
In order to avoid and reduction in column, beam, tied and other connecting pieces in the transport process of deformation, should be required to transport company in the binding component must be within the range of full length increase support, between the various components as far as possible using real wood pad, peripheral binding wants firm, to minimize the in transit due to vibration or pressure to cause deformation of components; in the loading and unloading to with two hanging points, such as super long component, the pole and to appropriately increase the lifting point; component in the installation field stacking, should minimize the stacking layers, generally not more than 3 layer, at the same time to add adequate support, to prevent deformation of the compression member. Do not let transportation, crane unloading, stacking and other aspects of the control. Otherwise, even if steel body structure component is made precise, due to transportation and other aspects of a problem, leading to the main steel structure installation appear big trouble.