1. Preparation before constructionThe preparatory work before the installation of high-rise steel frame structure, in addition to the general preparatory work, also includes: pre inspection and matching of steel structure components, inspection of steel column foundation, division of installation flow section, selection of installation machinery, etc. The manufacturing procedures of steel components in the processing plant are as follows: firstly, the preparation of component manufacturing instructions and the correction of raw materials; secondly, the lofting, blanking, cutting and other construction; hole making and edge processing; after assembly and welding, the end processing and friction surface treatment are carefully carried out, and the derusting and coating steps are strictly implemented, and finally the acceptance and shipment can be completed.
2. Measurement and positioning
Surveying and positioning is a matter that can not be ignored in construction. This process is not only the accurate positioning of steel structure deformation control, but also the quality and progress of the overall steel structure installation, which is closely related to the quality of the measurement work. Therefore, in the steel structure construction project, we should actively use advanced measuring instruments, mainly aiming at the difficulties and key points of high-rise steel structure construction, and make full use of the engineering construction experience, And closely combined with the characteristics of high-rise steel structure construction, the hoisting and welding quality of steel structure are correctly guided and real-time monitored.
2.1 measurement control content
The main contents of steel frame structure installation survey work: acceptance of civil engineering plane control baseline or red line boundary stake point and elevation datum point position is correct, and make written records; foundation embedded parts setting out in place and elevation; setting and controlling the elevation and axis of base plate group and component installation; reasonable establishment of main axis network; plane control network setting out; elevation measurement; H-beam column And the correction of box column.
2.2 basic methods of measurement control
Steel column measurement and control: adopt the control method combining the total station to check the axis deviation and theodolite to correct the verticality; elevation transfer: the conventional measurement method of elevation transfer can be directly carried out with a large ruler; the measurement and setting out of horizontal control network: according to the visibility conditions of the construction site, the main control axis is measured first, and then the building axes are encrypted; the vertical lead survey of horizontal control network: make the vertical lead survey of horizontal control network Use laser plumber to plumb the axis control points that have been measured.