Prefabricated measurement method for segmented folding pipe

Abstract

The invention relates to the technical field of shipbuilding processes, and discloses a prefabricated measurement method for a segmented folding pipe. The method comprises the steps of: measuring external reference points of a built ship body segment outside the ship body, measuring the feature points of a segmented folding port pipe end, building a three-dimensional coordinate system for each ship body segment, obtaining the reference points and feature point data, finally carrying out the segmented folding, just measuring the reference points again, building a three-dimensional coordinate system after folding, converting the feature point data of each ship body segment into the feature point data of the three-dimensional coordinate system after folding through the overlapping of the reference points, and measuring the data of a to-be-folded pipe. The method provided by the invention can obtain the manufacturing data of the segmented folding pipe in shipbuilding more easily and conveniently, does not need special measurement equipment and technology, does not need to increase the additional cost, can carry out the design and manufacturing of the folding pipe in advance, and creates conditions for shortening the service life of a dock.

Description

technical field [0001] The invention relates to the technical field of shipbuilding technology, in particular to a prefabricated measurement method for segmented closed pipes. Background technique [0002] In the process of ship construction, the hull needs to be built in sections, and then closed in sections, and the sections need to be connected by closing pipes. The traditional method of making the closing pipes is to make them on site. The environment is harsh, the efficiency is low, the labor intensity is high, and the requirements for workers' skills are also high, which is very inconvenient. [0003] In recent years, improved technologies have appeared in the industry one after another, which is to measure the data of the required closing pipes first, and then make additional closing pipes, for example, to measure at the closing mouth on site, and then make the closing pipes in the workshop according to the measurement data, and then install them on the ship. Among t...

AI Technical Summary

Problems solved by technology

[0004] However, the above-mentioned measurement methods all need to be measured on-site at the closing mouth, and the position where the end of the connecting pipe is visible at the same time is directly measured. The on-site measurement environment is usually in a small space inside the section, so the measurement site will have different environments. Restrictions and obstructions, harsh conditions, and cross operations with other processes are likely to interfere with each other. A closing port needs to be measured at multiple measurement positions, and the workload is heavy; the above-mentioned various measurement methods also have some disadvantages, such as: the closing must be measured at the same time The two ends of the pipe are connected to the pipe, and some pipes cannot be measured due to environmental factors; the measurement work can only be carried out after closing and welding; additional measurement equipment is required, the professional equipment used for photogrammetry is expensive, and software is required to analyze and process the image. The rope measurement requires a special rope measurement device, and the operation is cumbersome and inefficient. Therefore, these existing technologies have not been able to better reduce the difficulties often encountered in reality, and the efficiency that can be improved is also limited. Obtaining the data of the closing tube and completing the production of the closing tube faster have limited improvement in shortening the ship construction cycle and reducing the cost