Construction Design and Installation Technology of Fixed Length Cable for Large Span Saddle Shaped Single Layer Orthogonal Cable Net Structure

The large-span saddle shaped single-layer orthogonal cable net structure of national speed skating oval is the largest span and scale cable net structure in similar projects in the world. The specification and internal force of the cable are large. The load cable and stable cable are designed with double cables, which makes it difficult to lift and tension the cable. In addition, in the process of cable lifting and tensioning, the ring truss support has only vertical restraint, horizontal sliding, and ring truss support It is difficult to design and control the passive tension of the outer ring of truss curtain wall cable. How to solve the lifting and tension construction of large-span saddle shaped single-layer orthogonal cable net structure under the variable boundary conditions is the key to the construction of national speed skating Pavilion, which is directly related to whether the project can be completed on time.
In view of this situation, this paper systematically studies the cable fixed length design, installation error elimination, cable mesh weaving method, construction process simulation analysis, lifting tension construction and other aspects. It puts forward the concepts of fixed length cable installation, appropriate relaxation of synchronization requirements in the initial stage of cable network lifting, and the application of equal displacement synchronous tension forming in cable network tension stage The complete set of construction design and installation technology of large span saddle shaped single-layer orthogonal cable net structure, including calculation method, adjustable sleeve installation error elimination method, bearing pre deflection value design, construction simulation analysis, ground netting, phased, step-by-step, equal displacement integral lifting and tension forming technology. This technology solves the technical problem that the cable net structure is particularly sensitive to the construction error, successfully guides the construction of the cable net project of the national speed skating Pavilion, and ensures the smooth progress of the national speed skating hall project.