A Method for Calibration of Large-diameter and Thick-walled Circular Pipe

Abstract

The invention relates to a method for calibrating roundness of a large-diameter thick-wall round pipe. The method comprises the following steps of I, fixing a jack inside a deformed pipe orifice so as to support the inner wall of the deformed pipe orifice; II, measuring the outer circumference of the deformed pipe orifice by utilizing an arc plate so as to find out a deformed position; III, determining a heating position according to the deformed position, heating the heating position by utilizing a drying gun, and pushing outwards the inner wall of the deformed pipe along the radial direction by utilizing the jack; IV, stopping the heating when the temperature of the heating position reaches the given temperature, and cooling the deformed pipe orifice; V, dismounting the jack to complete the roundness calibration when the heating position is cooled to the room temperature. By adopting the method, the simplicity in operation can be realized, the efficiency is high, and not only can the pipe orifice roundness calibration precision be improved, but also the rejection rate is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of steel structures, in particular to a method for adjusting the circle of a large-diameter thick-walled round pipe. Background technique [0002] In the field of steel structure manufacturing, large-diameter thick-walled circular pipes are used more and more as steel-concrete columns in high-rise buildings. In the process of making super-high-rise large-diameter thick-walled circular tube members, the wrong side of the butt joint of the upper and lower columns shall not exceed 5mm. This kind of large-diameter thick-walled circular tube members are mostly rolled and welded by steel plates, and cold work hardening stress and welding residual stress will be generated in the processing engineering. After the blank is shortened, the stress begins to release, and the nozzle of the round pipe will change from circular to oval under the action of stress. The large-diameter thick-walled round pipe with deformed noz...

AI Technical Summary

Problems solved by technology

After the blank is shortened, the stress begins to release, and the nozzle of the round pipe will change from circular to oval under the action of stress. The large-diameter thick-walled round pipe with deformed nozzle cannot meet the appearance requirements of the steel-concrete column

At present, mechanical or manual methods are mostly used to calibrate the nozzle, but this method is not only time-consuming and laborious, it cannot meet the precision requirements of the round tube, and the scrap rate will increase due to incorrect calibration methods.

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