Study On Application Of Lifting Segment By Segment Technology For Large Span Steel Truss

In the industrial engineering domain, the great span steel truss structure application is quite widespread for satisfy the use function and the load bearing function request, this structure has the flexibility to be big, installs an accuracy requirement higher characteristic, so the structure displacement control appears more important. The large span steel truss structural design theory tends to be mature, but the job practice and the construction precision also wait for further enhancing.This article has elaborated the lifting segment technology in the large span steel structure's application, discussed the great span steel truss manufacture, to analyze the segment principle, to hang the point separately to hang the high choice, the hoisting operating mode analysis, and take the Chongqing 811 micro electron industry garden project as the project example, the elaboration model large span steel truss partition hoisting technology. Mainly includes the following content:1,Large span steel truss manufactureBased on the great span steel truss's manufacture flow is the main mentality, summarized the steel truss board production process, the assembly technology, the welding process and the whole pre-assembling craft with emphasis, elaborated its important technical point and the control method separately.2,Lifting segment by segment technology for large span steel trussTake the steel truss partition hoisting construction craft as a foundation, elaborated the steel truss partition division, the component transportation and the stack, component assembling, the component hoisting, the construction welding in detail and so on installs the craft, as well as the steel truss welding's distortion control method, and elaborated the steel truss survey and the monitor technology.3,The choice of hoisting height for large span steel trussThe application objective function degree of satisfaction law, established the hoisting up to change and the rope Tension's mathematical relation model highly, has analyzed, when the objective function was in the best choice scope, obtained the ideal steel truss hoisting up to choose the scope highly, the solution formerly depended upon the experience to obtain hangs the high question.4,The analysis of hoisting point settting for large span steel trussBased on strain energy principle: Will change in the structure the acting different obligatory point, the structural unit strain energy also will change, proposed that will apply the strain energy method in the steel truss four hoisting points in the hoisting construction, different four will hang a combination take the steel truss as the variable, will carry on the ANSYS software's strain energy numerical simulation analysis, will calculate is under the smallest strain energy combination four to hang a combination, will analyze and obtains the structural unit the member endogenic force and the nodal displacement is at the reasonable condition, therefore should hang the restraint combination to be possible to think that hangs a combination best.5,Project exampleTake the Chongqing 811 micro electron industry garden project as the project example,the system will elaborate the great span steel truss's partition will install the craft, used under the MIDAS software multianalysis five kind of construction operating mode combination condition the great span steel truss partition hoisting construction displacement and stress, simultaneously confirmed has hung the high choice and hangs an establishment the rationality and the scientific nature.Perfect and has the important practice significance safely regarding the promotion partition hoisting technology theory.