Research and application of processing technology for 1 large space box-section bending and torsion members
According to the needs of the National Stadium and other projects, this paper introduces the forming principle of large-scale space box-section bending and torsion members (1200× 20 ~ 100, 600× 600× 40 ~ 20, steel Q345GJC), the software for making three-dimensional special members, the processing and inspection of twisted panels, and the bending and torsion members. The research results have been used in the National Stadium (Bird's Nest), Capital Airport Ground Transportation Center (GTC) and other projects, and have been well received by the construction unit, design institute and supervision unit.
2. Research and application of new arc machining technology for large diameter steel pipe.
According to the needs of several large-scale key projects, our company has developed a new process and technology for processing large-diameter arc steel pipes, which has expanded the scope of processing steel pipes by traditional processes.
(1) pyrotechnic bending technology: used for the ring beam at the top of the National Grand Theatre &; Arc machining of phi 1 125×26 steel pipe;
(2) Intermediate frequency bending technology: used in Guangzhou New TV Tower & elliptical ring beams with different specifications; Phi800× (25, 30, 35), radius of curvature r
(3) Newly developed cold-pressed elbow forming technology: 2000-ton oil press is used for cold bending. Our company has developed an openable upper die, an openable lower die (patent application number: 2007 10 134959.4) and special arc detection tools. The research results have been applied to the main arch of steel structure in the shed project of Shenyang Olympic Sports Center Stadium. phi 1524×25。 phi 1422×34。 Phi 1422×25, radius of curvature r =14.7 ~ 300m, ring arch & φ; 132 1×34。 phi 12 18×25。 Phi965× 16 steel pipe arc machining; It is also used in the transportation center of the Capital Airport &; Phi Guangzhou TV Tower & 1650×22 steel pipe and large ring beam; Arc machining of phi800×(25, 30, 35) steel pipe.
3. Innovation of processing technology of spindle-shaped steel tube column and cone-shaped steel tube column.
According to the Capital Airport Terminal &; Phi (3084 ~1000) × (60,50,40), length 30m, φ; (1683 ~1000) × (50,42), 20m long, made of Q345GJC steel, and adopted in Guangzhou new TV tower &; Phi(2000~ 1200)×(50~30) tapered steel tube column, and the steel material requirements are Q345GJC and Q390GJC. Our company independently innovated and developed and solved the problems encountered in the production of tapered steel tube column and tapered steel tube segmented assembly shuttle column. In this paper, the processing technology of spindle-shaped steel tube column and cone-shaped steel tube column is adopted, and the detailed drawings of parts are drawn by computer three-dimensional lofting technology. As the basis of drawing blanking diagram and numerical control programming, the layout blanking, pressing head, forming technology, assembly welding and calibration inspection of conical steel pipe are comprehensively studied and developed.
4. Research and application of new manufacturing technology for complex joints.
In recent years, due to the strange and novel architectural modeling, the joint structure in steel structure engineering is very complicated, which brings considerable difficulties and problems to steel structure processing and manufacturing. In order to solve the processing and manufacturing of these complex nodes, our company has developed a set of new processes and technologies. The following only introduces the new processing technology and technology of complex joint structure in four projects.
(1), X-joint of Guangzhou Pearl River New Town West Tower Project, mainly composed of&phi1800× 50 ~ & Phi 1 150×30 external cylindrical column, 70~ 100mm thick oval pull plate, stiffening ring, stiffening plate, ground beam support, etc.
(2) The connection node between the outer ring ribbon truss and the giant column at the intersection of more than ten members of the F89~F9 1 floor of Shanghai World Financial Center is cast steel, and the extension bracket and accessories of the node are processed, assembled and welded by our company.
(3) The new processing technology of the multi-directional steel structure column and its butterfly support in the main building of the new CCTV site.
(4) New manufacturing technology of complex joints in multi-support intersection of steel structure engineering of National Stadium.
5. Research and application of thick plate welding technology.
In many steel structure projects undertaken by our company, almost all of them have encountered the problem of processing and manufacturing thick plates and ultra-thick plates with a large number of high-strength steel. Such as the main building of CCTV new site, Shanghai World Financial Center, National Stadium and other steel structure projects. In this paper, the metallographic structure damage of base metal, welding residual stress and deformation of components, the possibility of welding cracks and the tendency of delamination, which are easy to occur in thick plate and ultra-thick plate processing, are deeply studied, and a new processing technology for thick plate components is compiled, and the control of the whole welding process (including material control, groove control, temperature control, process control, deformation control and residual stress elimination) is studied. The welding technology of Q460E steel thick plate was studied experimentally. The system has been successfully applied to the National Stadium and the new site project of CCTV.
The above scientific and technological achievements are innovative and advanced. Due to the emphasis on the combination of traditional technology and modern computer-aided system in the research process, the cost is low and it has considerable promotion value. These scientific and technological achievements have been praised by experts in the industry, and they believe that the achievements have filled the gaps at home and abroad and reached the world leading level. The engineering application of this scientific and technological achievement has achieved good social and economic benefits, which not only shows that China can independently complete the fabrication and construction of super-large complex building steel structure projects, but also provides valuable experience and technical support for the construction of similar projects in China in the future, and provides an important basis for the compilation and revision of relevant codes, regulations and standards.