Manufacturing method of non-uniform crankle box girder rotary ladder

Abstract

The invention discloses a manufacturing method of a non-uniform crankle box girder rotary ladder. According to the construction scheme, the manufacturing method includes the steps that 1, flange plates and webs are lofted through a computer and then subjected to numerical control programming, and the flange plates and the webs are cut with plasma and discharged according to programming; 2, the flange plates and the webs are curled on a roller bed; 3, the projection contour of the rotary ladder is drawn on a bed mould, and the projection contour is divided into N equal parts corresponding to all levels of stairs; 4, the altitude differences of bisectrices relative to the stepping initial side are calculated, and a bed jig is welded to each bisectrix through profile steel according to the altitude differences; 5, bottom plates are spot-welded and assembled on the bed jigs; 6, the webs and the flange plates are spot-welded and assembled on the bottom plates; 7, top plates are spot-weldedand assembled on the flange plates and the webs, and step scribing of the levels of stairs is carried out; 8, the levels of stairs are spot-welded and assembled after discharging is completed throughnumerical control programming according to an expanded view of steps of the levels of stairs; 9, omni-bearing welding is carried out; and 10, inspection and coating are carried out. Assembly is carried out by simulating the actual mounting space structure size of the rotary profile steel ladder, the manufacturing precision is greatly improved, and the forming effect is good.

Description

technical field [0001] The invention relates to the manufacturing technology of building supporting facilities, in particular to a manufacturing method of a rotary ladder with uneven bending and torsion box girders. Background technique [0002] The rotating steel ladder is a three-dimensional rotating structure, and its positioning is a space node. At present, most of the rotating stairs are symmetrical structures on both sides. Such structures are simple to manufacture, low in cost, and consistent in terms of force and load. The building structure is also relatively stable and safe. However, as a decoration project, spiral staircases are also a development trend with complex and beautiful asymmetrical staircases, such as irregular and uneven curved and twisted box-shaped steel beam spiral staircases with large rotation angles, large sizes, and large spans. Although the structure is more difficult to manufacture Larger, but more beautiful, can further enhance the appreciati...

AI Technical Summary

Problems solved by technology

[0003] The revolving steel staircase is in the form of space bending and torsion structure. The section of the ladder beam is box-shaped, which is the main load-bearing structure. When assembling and welding, the assembly and welding process of box-shaped components should be adopted. If the traditional manufacturing technology is adopted, not only the construction period is long, the cost is high, and The welding deformation is large, the appearance is poor, and the inner partition of the twisted box-shaped member is assembled before the web, which makes it difficult to assemble the web and requires a large amount of correction

[0004] The spiral staircase made by the applicant unit of the present invention has an elliptic curve on the inner side of the rotation. In order to ensure that the steps of each step are equal, the corresponding expansion dimensions of each step are different, and the height of the web expansion is not uniform, showing a large change in shape. Accurate Locating the connecting dimensions of each component, the manufacturing process is complicated, and the control precision is high. It is difficult to control its shape and size during manufacturing, and there is often a large deviation between workshop production and on-site installation dimensions.

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