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Method and system for measuring maximum gap of tail ends of transverse ribs of hot-rolled ribbed steel bar based on image processing

A technology of maximum gap and image processing, applied in image data processing, image analysis, image enhancement, etc., can solve problems such as inconsistency of methods, large measurement error of the maximum gap at the end of transverse ribs, etc.

Active Publication Date: 2021-09-10
CHINA RAILWAY LIUYUAN GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, due to differences in technical level or comprehension ability, different technicians use different methods to measure this parameter in different laboratories, which leads to large errors in the measurement of the maximum gap at the end of the transverse rib.

Method used

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  • Method and system for measuring maximum gap of tail ends of transverse ribs of hot-rolled ribbed steel bar based on image processing
  • Method and system for measuring maximum gap of tail ends of transverse ribs of hot-rolled ribbed steel bar based on image processing
  • Method and system for measuring maximum gap of tail ends of transverse ribs of hot-rolled ribbed steel bar based on image processing

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Embodiment 1: as figure 1 As shown, a measurement system for the maximum gap at the end of the transverse rib of a hot-rolled ribbed steel bar is mainly composed of a camera 4, a measurement base 1 and an image processing system. in:

[0026] The measuring base 1 is provided with a slot 2 for placing hot-rolled ribbed steel bars, and one end of the slot 2 is provided with a connecting riser 3 fixed to the measuring base 1, and the connecting riser 3 is provided with a vertical line 31;

[0027] The camera 4 is arranged directly above the card slot 2 .

[0028] Wherein, in this embodiment 1, the camera 4 is used to collect digital images of the hot-rolled ribbed steel bars placed in the slot 2; The ribbed steel bar is adjusted so that the section between the two longitudinal ribs of the steel bar is perpendicular to the horizontal plane, so as to ensure that the end position of the transverse rib of the steel bar to be measured is all within the field of view collecte...

Embodiment 2

[0030] Embodiment 2: as Figures 1 to 2 As shown, an image processing-based method for measuring the maximum gap at the end of a steel bar transverse rib, specifically includes the following steps:

[0031] S1. First, place the hot-rolled ribbed steel bar to be tested on a horizontal table, mark the end positions of the first, sixth and eleventh transverse ribs on one side of the steel bar, and use a vernier caliper to measure the marked first The distance L between the end position of the 1st and the 11th transverse rib 1 , accurate to 0.01mm;

[0032] Among them, such as figure 2 As shown, A is the marked end position of the first transverse rib, B is the marked end position of the sixth transverse rib, C is the marked end position of the 11th transverse rib, two adjacent transverse rib ends The number of transverse ribs spaced between positions is 5 to ensure the accuracy and representativeness of the measurement results; dividing L1 by 10 is the transverse rib spacing,...

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Abstract

The invention relates to a method and a system for measuring the maximum gap of the tail ends of transverse ribs of a hot-rolled ribbed steel bar based on image processing, and the method comprises the following steps: S1, marking the tail ends of three transverse ribs on one surface of the hot-rolled ribbed steel bar to be detected, and measuring the distance between the tail ends of the three marked transverse ribs; S2, adjusting the placement position of the reinforcing steel bar, and acquiring a digital image of the reinforcing steel bar by using a camera; S3, restoring the collected digital image to be consistent with the actual size of the measured hot-rolled ribbed steel bar in proportion through image processing software; S4, marking the tail end positions of transverse ribs on the two sides of the longitudinal rib of the reinforcing steel bar through image processing software, and two straight lines are obtained through fitting; and respectively measuring the distance between the two fitting straight lines at the tail end of the marked transverse rib, and averaging the distance to obtain the maximum gap of the tail end of the transverse rib. The measurement method does not need to depend on the knowledge level and the operation level of operators, and measurement errors caused by manual operation can be effectively avoided.

Description

technical field [0001] The invention relates to the field of detection of building steel materials, in particular to a method capable of efficiently, accurately and rapidly measuring the maximum gap at the end of a transverse rib of a hot-rolled ribbed steel bar and a measurement system used in conjunction with it. Background technique [0002] Since the implementation of "Steel for Reinforced Concrete Part 2: Hot-rolled Ribbed Steel Bars" GB / T 1499.2-2018 instead of GB / T1499.2-2007, the maximum gap fi at the end of the transverse rib has been taken as one of the dimensions of hot-rolled ribbed steel bars Important parameters have been retained, but the national standard "Code for Construction Quality Acceptance of Concrete Structure Engineering" GB / T 50204-2015 requires only the yield strength, tensile strength, elongation, bending performance and weight deviation of steel bars for sub-projects of steel bars to test. For the Tianjin engineering construction standard "Tianj...

Claims

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Application Information

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IPC IPC(8): G01B11/14G06T7/62G06T7/70
CPCG01B11/14G06T7/62G06T7/70G06T2207/30136
Inventor 刘星闫高翔袁真秀褚家鑫韩环立刘毅仁王路张敬娜孙中科赵晓亮田占峰樊然
Owner CHINA RAILWAY LIUYUAN GRP CO LTD