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Method for carrying out distance monitoring by applying forced centering manner

A technology of forced centering and distance, applied in the direction of sight distance measurement, measuring distance, measuring device, etc., can solve the problems of large error, poor centering, inaccurate position fix, etc., to achieve the effect of data consistency and high measurement accuracy

Pending Publication Date: 2017-12-29
浙江中材工程勘测设计有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the neutrality is poor, the position is not fixed accurately, and the error is large

Method used

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  • Method for carrying out distance monitoring by applying forced centering manner
  • Method for carrying out distance monitoring by applying forced centering manner
  • Method for carrying out distance monitoring by applying forced centering manner

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Refer to Table 1 for the measurement results of 3 consecutive measurements by five testers at the same test point. The permanent magnet used in the test is a cylindrical magnet with a diameter of 25mm and a thickness of 3mm; the model of the laser rangefinder used for the test is Boss GLM30 ( Working range: 0.15‐30 meters; minimum indication range: 1 mm; laser class: Class 2, 635nm, <1nW; maximum number of measurements: 5000; anti-drop test: 1m; measurement accuracy: ±2 mm; dust and splash resistance level : IP 54; Working temperature: ‐10°C...+45°C; Storage temperature: ‐20°C...+70°C; Dimensions: 105x 41x 24mm; Weight: 0.1kg; ), the test site is a subway shield tunnel in a city in Zhejiang , the inner diameter of the tunnel segment is 5.5m (outer diameter 6.2m, wall thickness 0.35m), and the test distance is 5.5m.

[0033] Table 1 Parallel measurement of the same measurement point and different testers

[0034]

[0035] The analysis of the test results in Table 1 i...

Embodiment 2

[0040] Table 2 is a statistical table of test data for long-term monitoring of multiple test points (selected at random), in which the permanent magnet used in the test has a diameter of φ25mm and a thickness of 3mm; the model of the laser rangefinder used in the test is Boss GLM30, and the test accuracy is 2mm .

[0041] Table 2 Convergence test data statistics table

[0042]

[0043] The analysis of the test results in Table 2 is as follows:

[0044] When multiple people test in parallel, the probability of a single data being the same is more than 80%, and the average of 3 test results by the same tester is the final value of each test, and the probability of being the same in parallel observation is 98.3%. The results show that when using the same instrument and different personnel to observe in parallel, the final test results are basically unchanged or have a maximum difference of 1mm, which meets the requirements of the current national standards and is better than ...

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Abstract

The invention relates to a method for carrying out distance monitoring by applying a forced centering manner. A distance monitoring device used by the method comprises a forced centering device and a laser range finder, wherein the forced centering device comprises a permanent magnet I and a permanent magnet II, which have the same or similar structure and size; the permanent magnet I is fixed on a measurement basic point; the permanent magnet II is fixed at the tail end of the laser range finder; the axis of the permanent magnet II is overlapped with or parallel to a laser beam emitted by the laser range finder. According to the method for carrying out the distance monitoring by applying the forced centering manner, provided by the invention, the permanent magnet I and the permanent magnet II, which have the same or similar structure and size, are automatically and forcedly centered after mutual magnetic attraction of the permanent magnet I and the permanent magnet II, so that the laser range finder can be conveniently and rapidly on the measurement basic point in a measurement process, and the data consistency of a plurality of times of measurement on the same measurement basic point and the measurement precision are relatively high.

Description

technical field [0001] The invention relates to a method for distance monitoring by means of forced centering. Background technique [0002] In the process of construction, operation and maintenance of tunnels such as subways, highways, and railways, the stability of the surrounding rock or structure of the tunnel can be clearly and intuitively judged by measuring the change in the clearance size around the tunnel, that is, the measurement of the convergence displacement around the tunnel. Therefore, convergence monitoring is an essential monitoring method. Currently, commonly used monitoring instruments include steel ruler convergence gauge, total station, laser range finder, etc. Among them, during the measurement process of the steel ruler extensometer, after one end is fixed, the other end is manually pulled to the measurement point, which has technical defects of poor efficiency and low precision. The total station test needs to fix the station fixture, the test point ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C15/00G01C3/02
CPCG01C3/02G01C15/00
Inventor 张胜利
Owner 浙江中材工程勘测设计有限公司