门式钢架厂房结构安装技术（Structure installation technology of portal steel house）Structure installation technology of portal steel houseDate: 2010-11-30 9:50:16 editor: number of clicks of the information center:In recent years, because of the characteristics of steel structure and the improvement of the national steel output, the steel structure technology has developed rapidly. A large number of steel structure light steel factory buildings have been built in our country, especially the portal frame structures are widely used. I have been engaged in the installation of steel structure, combined with our company is the construction plant, according to the characteristics of portal frame structure on the installation process such building structure and some problems should be paid attention to.Portal frame light weight, slender component, easy deformation, and the installation of high precision, so the installation sequence of rational choice is an important link to ensure the installation quality of the overall structure, reasonable installation procedures are as follows: from the inter column brace internode began, first installed four steel column and the column support. To form a stable body. Then, the roof beams and sub structures between the two columns are installed so that a stable installation unit is formed, and finally, the installation of steel column, crane beam and roof beam are carried out in turn. The adjustment of the crane beam shall be carried out after the erection of all the structures.According to the structural features, it is divided into three areas for installation, the first zone is DEF cross structure installation, the second zone is FGH cross structure installation, and the third zone is HJK cross structure installation.Installation order: every area were installed to start the installation to the 1 line from the 18 line, the first installation of 18 lines and 17 lines between the steel column and column support, I installed the roof structure, the adjustment of the first internode after passing again in order to 1 line installation of steel column, steel roof, steel crane girder structure, finally installation of wall structure. The following describes the installation method.1. preparation before installationThe 1.1 component test: the component approach must be carefully according to the requirements of the drawings to the component number, size, position and diameter of screw connection to conduct a comprehensive review, in accordance with the design drawings and specifications before entering the installation.1.2, in accordance with the requirements of the installation drawings, carefully check the number of components, and components in the installation position to the nearest place, so as to facilitate lifting.1.3 basic retest and cavingPrior to the erection of steel structure according to the civil engineering construction drawings and process transfer single positioning on the basis of the axis, column foundation elevation, the cup size project retest and put on the line, to determine the installation standard, measuring and recording. The basic retest shall meet the following requirements:Item number deviation (mm)1 elevation of support surface + 3Horizontal L/10002 building location axis L/20000And not greater than 32. steel column installationThe installation of steel columns should begin with columns supported by columns. First, two steel columns and columns are installed to form a system, and then the crane beams and roof beams are installed.2.1 preparation before lifting:2.1.1 determine the installation criteria and, on the basis of the installation of the post, cross the centerline to facilitate post alignment checks.2.1.2 in the column to installation markers, including the cross center line, vertical line and elevation detection test line. Verticality detection line should be marked in two mutually perpendicular cylinders, elevation detection line should be on the surface of the bracket base position marking the measuring point in the column on the + 1.000m, easy to retest installation.2.1.3 foundation plate installation(1) determine the thickness of the base plate and the surface elevation of the base plate according to the basic retest and column shape inspection records. Make the base elevation + shim thickness + column bottom to the bracket surface height = the upper surface elevation of the bracket, ensure the upper surface elevation of the bracket after installation, in order to ensure the installation accuracy of crane beam.(2) the base pad shall be made of a pair of bias iron and several pieces of square iron, each of which shall be no more than five pieces.(3) the plate should be set near the base plate of stiffened plates or columns, plate and foundation contact surface should be flat and tight.(4) the foundation must be carefully cleaned before the plate is inst