Production method of 360-degree spiral stair with cambered box beams

Abstract

The invention relates to a production method of a 360-degree spiral stair with cambered box beams. The stair is formed by assembling and mounting of the cambered box beams on two sides, steps and bottom uprights. The method includes the steps: adopting a computer to perform part lofting according to three-dimensional spatial point coordinates of flange plates and webs in design details and X-Y coordinates expanded in a two-dimensional plane; accurately blanking on a numerical control cutting machine according to programming; producing and assembling a moulding bed; adopting a total station to measure positioning points of bottom flanges of the stair beams on the moulding bed; subjecting cambered plates to rolling and pressing shaping; assembling segments by an 'integral assembly, end to end connection and section falling head' mode; subjecting the box stair beams to integral welding and correction; assembling and welding step plates; measuring and correcting overall dimensions; and inspecting, and coating after sand blasting. By the production method, used energy, materials and labor can be reduced, production cycle and construction difficulty are reduced, and quality of a finished product is improved.

Description

technical field [0001] The invention relates to a method for manufacturing a 360° revolving staircase with a twisted box beam. The utility model belongs to the technical field of steel structure manufacture. Background technique [0002] The steel staircase is in the form of space bending and torsion structure, and the section of the ladder beam is box-shaped. In the past, the multi-segment curved and twisted box-shaped steel beam spiral staircase adopted the production technology of "mold profiling, pyrotechnic correction" and "single-section production first, and then overall assembly (or no assembly)". The welding process of the box-shaped member of the "web", as well as the traditional welding process. However, for the twisted box-shaped steel girder spiral staircase with large rotation angle and large size, the traditional manufacturing technology has the following disadvantages: [0003] (1) The traditional technology has long construction period, high cost, high en...

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Problems solved by technology

[0003] (1) The traditional technology has long construction period, high cost, high energy consumption, low efficiency, large welding deformation, difficult correction, poor appearance, etc.;

[0004] (2) It is difficult to control the overall installation size during single-section production, and it is difficult to correct single-section formed box-shaped components during overall assembly;

[0005] (3) The overall assembly frame of the large spiral staircase is too high, which wastes the material of the frame and has a high risk of construction safety;

[0006] (4) The inner diaphragm of the twisted box-shaped member is assembled in front of the web, which leads to difficulty in assembling the web and a large amount of correction

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