Buried pipeline deformation degree detection method and buried pipeline deformation degree evaluation method

A technology of buried pipelines and deformation degree, which is applied to measurement devices, instruments, optical devices, etc., can solve the problems of large numerical measurement errors of compression deformation, and achieve the effect of accurate control and easy maintenance or replacement.

Inactive Publication Date: 2017-12-22
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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Problems solved by technology

However, in actual operation, it is difficult to ensure that the laser emitted by the laser range finder just passes

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  • Buried pipeline deformation degree detection method and buried pipeline deformation degree evaluation method

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[0041] Example

[0042] This embodiment provides a method for detecting the degree of deformation of a buried pipeline, including:

[0043] 1. Use a laser profile scanner in the lumen of the buried pipeline to collect the coordinates of n detection points on the inner wall of the buried pipeline. The coordinates of each detection point are:

[0044] Where x i Is the abscissa of the i-th detection point; z i Is the ordinate of the i-th detection point; d i Is the distance from the i-th detection point to the center of rotation; θ i It is the rotation angle of the i-th detection point with the rotation center as the origin and the horizontal axis set in the horizontal direction; i and n are both positive integers and i is less than or equal to n.

[0045] 2. Bring the coordinates of each detection point into the ellipse standard equation Ax 2 +Bz 2 +Cx+Dz+E=0 Perform data fitting to obtain the first fitting equation. The length of the horizontal axis of the first fitting equation is 2...

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Abstract

The invention provides a buried pipeline deformation degree detection method and a buried pipeline deformation degree evaluation method and relates to the technical field of buried pipeline detection. The buried pipeline deformation degree detection method comprises the following steps: substituting detection point coordinates measured by a laser profile scanner into an elliptic equation for fitting to obtain a first fitting equation; and obtaining the difference value between the long axis and/or short axis of the first fitting equation and factory diameter of a buried pipeline to obtain a first deformation degree characteristic of the buried pipeline, wherein detection points are more than one, and the more than one detection points are distributed along the circumference of the buried pipeline, and are arranged in the same plane vertical to the axial lead of the buried pipeline. The buried pipeline deformation degree evaluation method comprises the step of carrying out evaluation on deformation degree of the buried pipeline by utilizing the deformation degree characteristics above, wherein the larger the absolute value of the difference value of the deformation degree characteristics is, the greater the deformation degree of the buried pipeline is. The two methods can truly reflect actual deformation degree of the buried pipeline; and the method allows the buried pipeline to be maintained or replaced conveniently, and can obtain safety degree of the buried pipeline more easily and accurately.

Description

technical field [0001] The invention relates to the technical field of detection of buried pipelines, in particular to a method for detecting the degree of deformation of buried pipelines and a method for evaluating the degree of deformation of buried pipelines. Background technique [0002] At present, the detection method of the degree of deformation of buried pipelines has low accuracy and cannot truly reflect the actual deformation of buried pipelines. It is also more difficult to control. [0003] Especially for large-diameter buried water pipelines, the conventional measurement method mostly uses a laser range finder. After the pipeline is emptied, the technician enters the pipeline, measures the distance from the top of the pipe to the bottom of the pipe, and compares the inner diameter of the pipe when it leaves the factory. Radial compression deformation in the empty state. The value of compression deformation is the core index used to control the long-term deform...

Claims

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Application Information

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IPC IPC(8): G01B11/16
CPCG01B11/16
Inventor 朱新民金可礼商峰汪劲松黄涛罗雄杰冯少孔刘亦兵崔炜李良庚邓检强陈立林彭冬聂鼎范哲陈峰杨璐菲王恒吕航
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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