Calculation method for measuring flatness of cross section of tunnel segment based on elongation of thrust cylinder

Abstract

The invention provides a calculation method for measuring the flatness of the cross section of a tunnel segment based on elongation of a thrust cylinder. The segment has a certain wedge-shaped amount, the cross section of the segment is a space ellipse which forms a certain angle with the cross section circle surface of a shield tail, and the calculation method is characterized in that the calculation is realized by calculating the distance deviation value between each segment measuring point and a calibration plane, and during application, the stroke of each propelling oil cylinder at the tail part of the shield tunneling machine is regarded as the distance between each segment measuring point and a propelling oil cylinder mounting plane. The distance between each measurement point Pi and the reference curve L0 is represented by delta di, the distance between each measurement point Pi and the calibration curve is represented by di, di represents the flatness of each measurement point of the duct piece, the larger the numerical value is, the worse the flatness of the measurement point of the duct piece is, and the minimum di is 0; and the distances from all the measurement points to the calibration curve are calculated by utilizing a formula di = li-f1 (theta i), so as to obtain the distance deviation value between each measurement point of the front edge cross section of the duct piece and the calibration curve L1.

Description

technical field [0001] The invention relates to the fields of automatic measurement and tunnel construction. Background technique [0002] With the improvement of China's urbanization level, the rapid growth of the urban population's demand for the construction of transportation networks is also increasing. As an important part of the transportation network, the construction volume of subway tunnels is also increasing. In view of the characteristics of safety, efficiency and economy in shield tunneling construction, shield tunneling machines have become the main construction equipment in tunnel construction and are widely used in subways, tunnels and other engineering fields. [0003] In order to ensure the safety and stability of the tunnel structure, multi-ring connected general-purpose wedge-shaped segments are used in shield construction as the innermost support structure of the tunnel. The same ring segment is spliced ​​by multiple prefabricated segments, and the assem...

AI Technical Summary

Problems solved by technology

This manual measurement method has major disadvantages: ① The three points selected manually are relatively arbitrary, and it is impossible to guarantee that the target plane calculated based on the three points is the best target plane, resulting in poor accuracy of the final calculated deviation value

② This method requires people to use a total station to measure the coordinates of each point of the cross section. In view of the space limitation of the shield construction scene, manual measurement is difficult, inconvenient to operate, and the measurement efficiency and real-time performance are poor, and it is difficult to meet the timeliness requirements of shield construction

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