Atmospheric refraction error eliminating method of pipe jacking automatic measuring and guiding system

Abstract

The invention relates to the technical field of an automatic measuring and guiding system for underground tunnel and pipe jacking engineering construction, and in particular relates to an atmospheric refraction error eliminating method of a pipe-jacking automatic measuring and guiding system. The atmospheric refraction error eliminating method is characterized by adopting relative measurement to eliminate atmospheric refraction errors, namely the elevation of a point B needs to be known when the elevation of a point A is known, and to be specific, the method comprises the following steps of: a, calculating the elevation of the point B under an atmospheric refraction condition according to an elevation calculating formula; b, calculating the elevation of a point B', which is taken as the known elevation of the point B, and measuring the elevation of the point A through the point B, thereby obtaining an error generated by atmospheric refraction at the point A; and c, calculating the coordinate of the error for eliminating the atmospheric refraction of the point B afterwards as the error generated by atmospheric refraction at the point A is accumulated twice. The correcting method provided by the invention is precise in operation, and conforms to the calculation logic; and because the method can obtain a pure mathematic calculation formula, the atmospheric refraction error eliminating method is universal, and the calculated result has high accuracy and precision.

Description

[technical field] [0001] The invention relates to the technical field of an automatic measurement and guidance system used in underground tunnels and pipe jacking projects, in particular to a method for correcting the atmospheric refraction error elimination method of a total station and improving the precision of the pipe jacking automatic measurement and guidance system. [Background technique] [0002] In long-distance underground pipe jacking projects, timely and accurate measurement of the position and attitude of the front-end pipe jacking machine is a very critical technical means to ensure that the pipe is jacked according to the design axis. The pipe jacking measurement generally sets wires in the cave, and manually transmits the measurement from the outside to the inside. Due to the high labor intensity of manual measurement, the work efficiency is low, and errors are prone to occur. In addition, the pipe jacking must be in a static state during the measurement opera...

AI Technical Summary

Problems solved by technology

[0004] When the total station laser passes through the ideal atmosphere, it is a straight line, but in fact, due to the uneven distribution of the atmospheric density of the pipeline during construction, the laser produces uneven refraction, which affects the observation results, resulting in a prism The error with the center of the total station, the error of each station is accumulated station by station during the traverse survey process, which seriously affects the accuracy of the final measurement result

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