An Axis Detection Method for Large Slope Tunnel Based on Shield Segment Measurement

Abstract

The invention relates to a method for detecting the axis of a large-slope tunnel based on the measurement of shield segments. The method utilizes the joint edge of the ring to determine the acquisition plane of the tunnel section, establishes an independent coordinate system, and uses the least square method to fit the space circle, and then coordinates system conversion. Compared with the prior art, the present invention fully considers the correction of the vertical deviation of the collection section during the tunnel axis detection, can truly reflect the construction deviation of the tunnel axis, and has a more scientific and feasible method, less measurement error and low implementation cost.

Description

technical field [0001] The invention relates to an axis detection method, in particular to a large-slope tunnel axis detection method based on shield segment measurement. Background technique [0002] During the excavation process of steep slope tunnels, the front part of the shield machine has a large mass. Once a posture deviation occurs, it will be difficult to correct the deviation of the ring piece, and it is not conducive to controlling the tunnel formation, and even affects the exit of the shield machine. Therefore, the tunnel construction process Real-time detection of the tunnel axis is required in order to ensure the accuracy of shield tunneling. Usually there are two axis detection methods: [0003] 1. Level plus height measurement: The position of the observation point of this method is not the actual center of the ring, especially when the slope of the tunnel is large, and the slope cannot be judged by human eyes in the tunnel. If the height of the vertical sur...

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Problems solved by technology

[0003] 1. Level plus height measurement: The position of the observation point of this method is not the actual center of the ring, especially when the slope of the tunnel is large, and the slope cannot be judged by human eyes in the tunnel. If the height of the vertical surface is used instead of the radial direction of the ring The length, that is, the vertical plane of the tunnel will produce obvious deviations, which will directly affect the measurement accuracy of the axis

[0004] 2. Total station section measurement: This method usually collects the three-dimensional coordinates of ring points in the vertical plane. When the slope of the tunnel is large, there is also a large deviation between the actual collection surface and the surface to be collected. Even if some sections are collected The software considers determining the direction of the collection section according to the design slope of the tunnel axis, but because the axis detection is just to measure the deviation between the actual construction axis and the design axis, obviously, when there is a large deviation between the construction axis and the design axis, due to the orientation according to the design axis, It will be difficult to find the true deviation of the construction axis

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