Welding ball center positioning method and device

Abstract

The invention relates to a welding ball center positioning method and device. The method comprises the following steps of: (1) setting three-dimensional coordinates (x, y, z) of a welding ball center; (2) projecting plane coordinates (x, y) of the welding ball center to a datum point on a datum plane along a vertical direction; (3) measuring three-dimensional coordinates (x, y, z') of the datum point by using a total station instrument to obtain the plane coordinates (x, y) of the welding ball center; and (4) working out a difference value between a vertical coordinate z' of the datum point and a vertical coordinate z of the welding ball center, and subtracting the difference value from the vertical coordinate z' of the datum point to obtain the vertical coordinate z of the welding ball center. The device comprises a cylinder and a bubble gradienter, wherein the cylinder is arranged on the surface of the welding ball and has an open end uniformly covered on the surface of a welding ball, and the bubble gradienter is horizontally and fixedly arranged on a geometric center of a closed end of the cylinder. In the invention, by means of the total station instrument, a positioning device is matched with the bubble gradienter so as to accurately and rapidly position the three-dimensional position of the welding ball center.

Description

technical field [0001] The invention relates to a method for positioning the center of a welding ball used as a welding node of a grid structure and a device used therein. Background technique [0002] At present, large-scale grid steel structures are generally welded by node welding balls and various rods, which have the advantages of light weight, high rigidity, and good seismic performance. They can be used as gymnasiums, theaters, exhibition halls, waiting halls, hangars, etc. The roof of the building. The use of welding balls as the nodes of the grid structure is one of the most commonly used node forms at present. It has the advantages of simple structure, clear force transmission, and convenient connection. [0003] During the assembly and installation of the welded ball grid frame, the support system needs to position the welded ball. The existing method is to initially position the super large welded ball with a manual hoist, and use a ruler and other tools to chec...

AI Technical Summary

Problems solved by technology

[0003] During the assembly and installation of the welded ball grid frame, the support system needs to position the welded balls. The existing method is to initially position the super large welded balls with a manual hoist, and use tools such as rulers to check the center of the welded balls with the naked eye. Estimated, but this method cannot accurately know whether the center position of the welding ball is accurate, and cannot meet the requirements of engineering accuracy

[0004] The existing ball center positioning method and the tools used are relatively simple, the accuracy is low, and the construction speed is extremely slow, which even leads to inaccurate positions and affects the success rate of butt joints of other rods, greatly affecting the construction speed

Therefore, the existing welding ball positioning method of the welding ball net frame has certain defects: (1) only rely on manual and naked eyes to estimate the ball center of the welding ball; The ball is adjusted, thereby affecting the construction period

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