Large-gradient tunnel axis detection method based on shield segment

Abstract

The invention relates to a large-gradient tunnel axis detection method based on a shield segment. The method utilizes a ring sheet joint edge to determine a tunnel fracture surface collection plane, establishes an independent coordinate system, takes a least square method to carry out space circle fitting, and then carries out coordinate system conversion. Compared with the prior art, the detection method disclosed by the invention fully considers the correction of a collected fracture surface vertical deviation during tunnel axis detection, so that a tunnel axis construction deviation can betruly reflected, and therefore, the method is more scientific and feasible, small in measurement errors and low in 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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