A visual measurement method for shield tail gap of shield machine

Abstract

The invention relates to a shield-tunneling-machine shield-tail-gap visual measurement method. The method comprises the following steps of (1) installing a camera, wherein a height between the camera and a shield-tunneling-machine bottom shield shell is h; (2) shooting original image of a shield tunneling machine during a work process by the camera, wherein the original image include a pipe-sheet upper edge and a pipe-sheet lower edge, and the pipe-sheet lower edge is an upper edge of a shield tail gap; (3) taking a horizontal shaft where a center point of the original image is located as a segmentation line and dividing the original image into a first subimage and a second subimage, wherein the second subimage includes the pipe-sheet upper edge; (4) acquiring the pipe-sheet upper edge from the second subimage, and acquiring a distance between the pipe-sheet upper edge and the center point of the original image in the original image d2; (5) converting the d2 into an actual height h2; and (6) according to the following formula, acquiring the shield tail gap d, wherein the formula is d=h+h2-d3, and the d3 is an actual height of a pipe sheet. Compared to the prior art, by using the method of the invention, the method is simple and a measurement result is accurate and reliable.

Description

technical field [0001] The invention relates to the field of image processing, in particular to a visual measurement method for the shield tail gap of a shield machine. Background technique [0002] In recent years, with the rapid development of my country's urban construction, shield machines have been widely used in the construction of urban subway tunnels. During shield construction, due to the curvature change of the shield machine’s propulsion route and the protruding length of the propulsion cylinder cannot be kept consistent at all times, the space between the inner wall of the shield shell at the tail of the shield machine and the outer diameter of the segment changes. The space is the shield tail gap. The schematic diagram of the structure of the shield tail gap is shown in figure 1 As shown, during the propulsion process of the propulsion cylinder 3 , the distance between the segment 2 and the inner wall of the shield machine 1 is the shield tail gap 4 . When th...

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Problems solved by technology

[0009] However, the above-mentioned methods require more hardware equipment, cost a lot, and at the same time, the measurement method is complicated, and the measurement results are not accurate enough.

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