Measurement method for excavation of special-shaped tunnel

Abstract

The invention provides a measurement method for the excavation of a special-shaped tunnel. The method includes the steps of performing a full-angle scanning by arranging a three-dimensional laser scanner behind the tail of a shield tunneling machine in a special-shaped tunnel and a cutter of the shield tunneling machine, to obtain a point cloud map of the inner surface of the special-shaped tunnel and the shell of the shield tunneling machine; according to the point cloud map of the inner surface of the special-shaped tunnel and the shell of the shield tunneling machine, obtaining a special-shaped tunnel inner surface model and a shield tunneling machine head-tail contour model of the special-shaped tunnel through tunnel cross-section extraction and shield tunneling machine outline cutting; determining a central axis of the special-shaped tunnel according to the special-shaped tunnel inner surface model and the shield tunneling machine head-tail contour model; and calculating posture data of the shield tunneling machine and central axis coordinate data of the special-shaped tunnel based on the central axis and a datum point. According to the invention, the limitation that the traditional measurement technology is only applicable to circular tunnels is overcome, through the measurement technology, the posture deviation of the shield tunneling, the deviation of the central axis in the excavation and the construction back break can be known at the same time, and the method of the invention is high in monitoring precision, low in manual requirement and suitable for tunnels of all shapes.

Description

technical field [0001] The invention relates to a measurement method for excavation of special-shaped tunnels. Background technique [0002] Traditional shield excavation measurement techniques include attitude measurement and axis measurement. [0003] The attitude measurement method is to set 6-8 measuring points on the casing in advance and install prisms or reflectors in the shield machine assembly stage, and calculate the geometric relationship between the measuring points and the front and rear carcass centers of the shield machine. Among them, the coordinates of the three measurement points can be obtained according to the existing geometric relationship, and the front and rear center coordinates of the shield machine can be obtained, thereby obtaining the attitude data of the shield machine. [0004] For the determination of the central axis of special-shaped tunnels, the wire measurement method is used. The wire point is generally set on one side of the excavation ...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a special-shaped tunnel excavation measurement method, which can solve the problem that the measurement error of the tunnel posture and axis is extremely large and the excavation volume of each ring of the shield cannot be accurately calculated by using conventional measurement techniques for special-shaped tunnels

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