Fast lofting method for connecting points of overhead line system of railway tunnel and automatic measuring system

Abstract

The invention discloses a fast lofting method for connecting points of an overhead line system of a railway tunnel and an automatic measuring system. The method includes the following steps: producing a foot stool of the automatic measuring system; installing and moving the automatic measuring system to an occupied station; regulating the foot stool to enable a worktable to be horizontal and a total station to be placed on a central line between two rails; calculating to obtain a steering angle; enabling the total station to aim at a back viewing point and turning over the steering angle to obtain a vertical surface where connecting point positions of the overhead line are located; rotating the lens of the total station in the vertical surface by a measurer and enabling the total station to measure continuously, obtaining a plurality of groups of measurement data, substituting each group of the measurement data into a formula in real time by the total station and alarming when the formula holds; then stopping the measurement, recording the laying-off angle of the group and corresponding laying-off distance; and displaying a point, namely the lofting point, on a tunnel wall by a laser sent by the total station and marking the point on the tunnel wall by the measurer to finish lofting. The method and the system can achieve high-efficiency and high-precision lofting point of the connecting points of the overhead line.

Description

technical field [0001] The invention belongs to the technical fields of precision engineering measurement and automatic measurement. In particular, the invention relates to a method for quickly setting out a connection point of a railway tunnel catenary and an automatic measurement system. Background technique [0002] In today's railway tunnel construction, it is particularly important to stake out the connection points of the catenary of the railway tunnel safely, accurately and efficiently. But this stakeout has caused headaches for surveyors in the construction of railway tunnel projects. This is because the construction personnel want to stake out the connection points of the catenary of the railway tunnel erected in space. First, they need to reverse calculate the coordinates of the points to be staked out according to the coordinates designed by the design institute, and then determine the location of the total station by wire measurement. The coordinates of the poi...

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Problems solved by technology

Moreover, because the track surface is not level at the turn of the rail, the total station cannot stake out in this case

[0003] To sum up, the disadvantages and drawbacks of the stakeout method for the connection points of the railway tunnel catenary at the present stage are obvious, as follows: First, the most important thing in engineering construction is personnel safety. Keep moving the prism in your hand, and if it is to supplement the existing catenary, there may be live work, which is very dangerous

There are many accidents caused by this in the process of engineering construction; secondly, the point accuracy of stake out is not high

Because stakeout is a discontinuous and intermittent process, and in order to improve efficiency in the construction process, points with low precision are often used as stakeout points; third, the efficiency is too low

The construction personnel searched for observation points intermittently, and the chance was too large, resulting in low efficiency; fourth, under special circumstances (such as non-parallel track surfaces), routine measurement was not possible, resulting in delays in the construction period

[0004] Therefore, the above-mentioned existing methods for stakeout of contact points of railway tunnel catenary are too simple, unsystematic, low in safety factor, low in efficiency, unguaranteed in accuracy, and cannot be handled in time in special cases

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