A Rapid Surveying and Mapping Method for Irregular Center-to-Centre Threaded Holes

Abstract

The invention discloses a rapid mapping method of a threaded hole system with an irregular center distance. The rapid mapping method comprises the following steps of: 1) at first, machining a square groove in the threaded end of a screw with total length of 90-120 mm and threaded length of 30-40 mm at a position which is 20mm far from the end face; and adhering a reflection sheet onto the square groove, wherein the length of the square groove is equal to the length of the reflection sheet and the depth of the square groove is a sum of one half of the threaded large diameter and the thickness of the reflection sheet; 2) placing a total station on the ground which is 5-7m out of a threaded hole to be detected and does not block sight; leveling the total station; and screwing the thread with a screw reserved length of 20 mm into a threaded hole to be detected, so that the reflection sheet is arranged in the direction that the total station can observe the refection sheet; and 3) measuring three porous relative N, E Z coordinates through the total station, and exporting data and editing the data to be data capable of being identified by AUTOCAD. According to the rapid mapping method provided by the invention, the data mapping accuracy can reach 100%; and the rapid mapping method has the characteristics of high speed, high accuracy, and reduction in labor cost.

Description

Technical field [0001] The invention relates to a surveying and mapping method for engineering surveys, in particular to a rapid surveying and mapping method for a threaded hole system with an irregular center distance. Background technique [0002] In the maintenance of large-scale steel rolling equipment, it is often encountered to map out the porous system on the plane, and then make liners and skateboards according to the drawings. In most cases, the hole system has been used for many years, and some have been processed online, the center distance has been greatly offset, and the dimension chain has changed, which does not conform to the original design size. Traditional surveying and mapping methods are too large and cumbersome, which requires design units to survey and map such holes quickly and accurately. [0003] The difficulty in surveying and mapping of threaded holes with irregular center distance lies in the fact that traditional surveying and mapping methods rely on ...

AI Technical Summary

Problems solved by technology

Traditional surveying and mapping methods are too large and cumbersome, which requires the design unit to quickly and accurately survey and map such hole systems

[0003] The difficulty of surveying and mapping threaded hole distances with irregular center distances lies in the fact that traditional surveying and mapping methods rely on steel rulers and vernier calipers, which cannot accurately determine the relative size chain, and the surveying and mapping dimensions are too large, cumbersome and error-prone

Lining boards and sliding boards designed on this basis are often reworked due to the inability to locate some holes, resulting in time-consuming and increased labor costs

Experiments show that the accuracy rate of the traditional surveying and mapping method is about 70%. Therefore, the traditional surveying and mapping method must be improved

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