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Method and system for measuring the maximum gap at the end of transverse rib of steel bar based on image processing

An image processing and maximum gap technology, which is applied in image data processing, image analysis, image enhancement, etc., can solve the problems of large measurement error and inconsistent methods of the maximum gap at the end of the transverse rib, achieve fast and accurate measurement, and eliminate the inconsistency of measurement methods Effect

Active Publication Date: 2022-07-29
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 the maximum gap at the end of transverse rib of steel bar based on image processing
  • Method and system for measuring the maximum gap at the end of transverse rib of steel bar based on image processing
  • Method and system for measuring the maximum gap at the end of transverse rib of steel bar based on image processing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: as figure 1 As shown, a system for measuring the maximum gap at the end of a 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, one end of the slot 2 is provided with a connecting vertical plate 3 fixed with the measuring base 1, and a vertical vertical plate 3 is arranged on the connecting vertical plate 3. line 31;

[0027] The camera 4 is arranged just 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 card slot 2 ; the vertical line 31 is used to assist the hot-rolled steel bars placed in the card 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 ensur...

Embodiment 2

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

[0031] S1, first, place the hot-rolled ribbed steel bar to be tested on a horizontal tabletop, mark the end positions of the 1st, 6th and 11th transverse rib on one side of the steel bar, and use a vernier caliper to measure the marked Distance L between 1st and 11th transverse rib end position 1 , accurate to 0.01mm;

[0032] Among them, such as figure 2 As shown, A is the marked end position of the 1st transverse rib, B is the marked end position of the 6th transverse rib, C is the marked and 11th transverse rib end position, two adjacent transverse rib ends The number of transverse ribs between the positions is 5 to ensure the accuracy and representativeness of the measurement results; dividing L1 by 10 is the transverse rib spacing, which should be accurat...

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Abstract

The invention relates to a method and a system for measuring the maximum gap at the ends of transverse ribs of hot-rolled ribbed steel bars based on image processing. The steps of the measurement method are as follows: S1, measure the positions of the ends of three transverse ribs on one side of the hot-rolled ribbed steel bars to be detected. Mark, and measure the distance between the marked end positions of the three transverse ribs; S2, adjust the placement position of the steel bar, and use the camera to collect the digital image of the steel bar; S3, use the image processing software to restore the collected digital image in proportion to the The actual dimensions of the measured hot-rolled ribbed steel bars are consistent; S4, mark the end positions of the transverse ribs on both sides of the longitudinal ribs of the steel bar by image processing software, and fit two straight lines; respectively measure the marked end positions of the transverse ribs The distance between the two fitted straight lines at the point, and the average value can be used to obtain the maximum clearance at the end of the transverse rib. The measurement method of the present invention does not need to depend on the knowledge level and operation level of the operator, and can effectively avoid measurement errors caused by human operation.

Description

technical field [0001] The invention relates to the field of construction steel testing, in particular to a method for efficiently, accurately and rapidly realizing the maximum gap measurement at the end of a transverse rib of a hot-rolled ribbed steel bar, and a measurement system used therewith. Background technique [0002] Since the implementation of "Steel for Reinforced Concrete Part 2: Hot-Rolled Ribbed Bar" GB / T 1499.2-2018 has replaced GB / T1499.2-2007, the maximum gap fi at the end of the transverse rib is used as one of the dimensions of the hot-rolled ribbed bar. Important parameters have been retained, but the national standard "Concrete Structure Engineering Construction Quality Acceptance Specification" GB / T 50204-2015 steel sub-project only requires the yield strength, tensile strength, elongation, bending performance and weight deviation of steel bars. Check it out. For Tianjin's engineering construction standard "Tianjin Construction Engineering Constructio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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