CN112945107B - Component connection detection method based on image recognition and data simulation - Google Patents
Component connection detection method based on image recognition and data simulation Download PDFInfo
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- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
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Abstract
The invention discloses a component connection detection method based on image identification and data simulation, which comprises the steps of extending an industrial endoscope into a sleeve to obtain an image, measuring the insertion depth and the deflection angle in the image, storing the current image after the measurement is finished to obtain a detection picture, searching the central point of the sleeve and a reinforcing steel bar in the detection picture, establishing a cross coordinate axis by using the central point of the sleeve, recording the quadrant position of the central point of the reinforcing steel bar in the cross quadrant coordinate axis, connecting the central point of the reinforcing steel bar with the axis of the cross coordinate axis to form angular parting lines, and measuring the included angle between the angular parting lines and the X axis or the Y axis; modeling is carried out through the size, the deflection angle, the cross coordinate axis, the angle distribution line, the included angle, the sleeve size and the size of the steel bar, which are inserted into the sleeve, and then grouting analysis is carried out through finite element software for judgment. The invention can accurately provide modeling data, thereby more truly simulating the connection stability in a connection state and having more accurate result.
Description
Technical Field
The invention relates to the technical field of assembly type building detection, in particular to a component connection detection method based on image recognition and data simulation.
Background
The steel bar sleeve grouting connection is a common link form of the existing rapidly-developed assembled concrete building, and the connection quality of the steel bar sleeve grouting connection is related to the overall quality of the structure. For a cast-in-place concrete structure, before concrete pouring, acceptance before concealment can be carried out on steel bar connection so as to ensure the engineering quality after pouring forming; at present, however, there is a substantial failure to fully and properly accept the rebar within the fabricated building sleeve. According to the relevant detection criteria, it is generally only possible to detect the insertion length of the bars in order to evaluate the quality of the connecting bars, which is far from sufficient. The amount and direction of deflection of the rebar within the sleeve, as well as its deflection and direction, are factors that affect the quality of the final connection. Firstly, due to adverse effects such as stress concentration, the node connection is easy to be insufficient in durability; secondly, in actual conditions, deviation or deflection of the steel bars may also cause unsmooth circulation of grouting materials in grouting holes or grout outlet holes, which leads to larger problems such as grouting defects and the like, and attention must be paid.
Because the deviation and deflection of the steel bars can occur in the processes of production, allocation and transportation, storage, transportation, assembly and the like of the components, when workers install the components, the components are generally not corrected actively (sometimes cannot be corrected) for saving the construction period, and even the steel bars are inclined actively for being adapted to the position of the sleeve to be installed smoothly, so that hidden troubles are buried in structural connection.
Therefore, the steel bar in the sleeve needs to be comprehensively and properly detected and accepted, the actual state of the steel bar in the sleeve is restored by detecting the insertion length, the deviation amount and direction and the like of the steel bar, and three-dimensional modeling is carried out according to data results so as to realize the stress performance analysis under the actual working condition and evaluate the connection reliability of the steel bar.
Disclosure of Invention
The invention aims to provide a component connection detection method based on image recognition and data simulation, which can accurately provide modeling data, so that the connection stability in a connection state can be simulated more truly, and the result is more accurate.
In order to solve the technical problems, the invention provides a component connection detection method based on image recognition and data simulation, wherein judgment is carried out after an upper-layer component is installed on the upper surface of a lower-layer component, a steel bar of the lower-layer component extends into a sleeve of the upper-layer component, and the inner wall of the sleeve is provided with a plurality of annular ribs which are uniformly arranged along the axial direction of the sleeve; the method comprises the following operation steps:
s1, installing a side-looking lens on the endoscope, then extending the endoscope into the sleeve, and acquiring images of the end part of the steel bar and the annular rib, wherein the acquired images comprise the complete picture of the inner wall of the sleeve, and the annular rib is ensured to be positioned in the middle of the images;
s2, measuring the insertion depth in the image, measuring the distance from the end of the steel bar to the surface of the side-view lens through the point-to-surface measuring function, and then calculating the size of the steel bar inserted into the sleeve according to the height of the side-view lens;
s3, performing deflection measurement in the image, selecting an annular rib adjacent to the side view lens, selecting three points at the intersection of the annular rib and the inner wall of the sleeve to form a reference plane, then selecting a point E and a point F on the edge of the longitudinal rib of the reinforcing steel bar, wherein the selected position of the point E is close to the top of the longitudinal rib, the selected position of the point F is below the reference plane, measuring the distance H1 from the point E to the reference plane, measuring the distance H2 from the point F to the reference plane, and measuring the straight-line distance L1 from the point E to the point F along the longitudinal rib by using the point-to-surface measuring function, then cos α ═ H2+ H1)/L1; wherein alpha is the deflection angle of the steel bar along the axial direction of the sleeve, and the point E and the point F are positioned on the same longitudinal rib and the edge of the same side;
s4, storing the current image to obtain a detection picture, searching central points of the sleeve and the reinforcing steel bar in the detection picture, establishing a cross coordinate axis on the detection picture after the searching is finished, enabling the axis of the cross coordinate axis to coincide with the central point of the sleeve, recording the quadrant position of the central point of the reinforcing steel bar in the quadrant of the cross coordinate axis, connecting the central point of the reinforcing steel bar with the axis of the cross coordinate axis to form an angular separation line, and measuring an included angle between the angular separation line and the X axis or the Y axis;
s5, modeling is carried out through the size, deflection angle, cross coordinate axis, angular distribution line, included angle, sleeve size and steel bar size of the steel bars inserted into the sleeve, grouting analysis is carried out through finite element software, connection performance data are obtained, and result judgment is carried out.
Further, in the central point search of the sleeve, the annular rib selected in the step S3 is selected first, a point a is selected at any position of the boundary between the annular rib and the inner wall of the sleeve, then a point B is selected at the corresponding boundary on the other side through the real-time translation size display function, when the translation size display of the selected point is the largest, the position is selected as the point B, a point C is selected at the boundary near the point a, then a point D is selected at the corresponding boundary on the other side through the real-time translation size display function, when the translation size display of the selected point is the largest, the position is selected as the point D, and the connecting line of the point a and the point B intersects the connecting line of the point C and the point D to form the central point of the sleeve.
Furthermore, in the searching of the central point of the steel bar, four intersection points formed by the circular body at the end part of the steel bar and the two longitudinal ribs are determined firstly, and the connecting line is selected in a pairwise staggered mode to form the central point of the steel bar.
Furthermore, the Y axis of the cross coordinate axis is consistent with the axial direction of the slurry outlet.
Further, still include stainless steel tubule and location stopper, the location stopper cover is established on stainless steel tubule surface, and the location stopper fills in the grout outlet of upper strata component and fixed stainless steel tubule, and the endoscope passes through the stainless steel tubule and stretches into in the sleeve.
Further, the deflection verification angle alpha 'of the reinforcing steel bar along the axial direction of the sleeve is calculated through the size of the reinforcing steel bar inserted into the sleeve, the size of the angular line, the size of the connecting line of the point A and the point B and the diameter of the sleeve, the average deflection angles of the alpha' and the alpha are calculated, and modeling is carried out through the average deflection angle.
The invention has the beneficial effects that:
1. the invention can directly measure the parameters required by modeling through an industrial endoscope, and can directly simulate the connection condition after grouting under the field condition through rapid modeling, thereby obtaining a detection judgment result close to reality and having more credibility.
2. Through the mode of establishing the cross coordinate axis, the plane that the axis is located after can effectual definite reinforcing bar slopes, consequently can be quick the reduction reinforcing bar off normal condition, and the reduction effect is good after the modeling.
3. The measured deflection and inclination of the reinforcing steel bar are converted into the relative distance between two points on the longitudinal rib of the reinforcing steel bar and a plane and the linear distance between the two points through the size measuring technology of the endoscope, the deflection angle of the reinforcing steel bar in the sleeve relative to the axial direction is obtained through calculation of a mathematical trigonometric function, whether the reinforcing steel bar deflects or inclines is judged, and quantitative calculation is carried out, so that the detection accuracy is high.
Drawings
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a schematic view of the detection operation of the present invention;
FIG. 3 is an operational view of the insertion depth measurement of the present invention;
FIG. 4 is a deflection measurement operational view of the present invention;
FIG. 5 is a schematic diagram of the present invention center-finding operation;
FIG. 6 is a schematic view of the quadrant positioning operation of the present invention;
FIG. 7 is a schematic view of the positioner of the present invention.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
Referring to fig. 1, in an embodiment of a component connection detection method based on image recognition and data simulation according to the present invention, after an upper member 1 is mounted on an upper surface of a lower member 2, a determination operation is performed, in which it is determined that the height of the end of a reinforcing bar does not exceed the bottom edge of a grout outlet of a sleeve 3, so that the reinforcing bar has a problem that the actual insertion depth approaches the design value; the method is also carried out based on the existing sleeve with ribs commonly used in the market, namely, the inner wall of the sleeve is provided with a plurality of annular ribs 4 which are uniformly arranged along the axial direction of the sleeve; the specific method comprises the following steps:
firstly, a side-looking lens is installed on an endoscope 5, then the endoscope extends into the sleeve, the end part of the steel bar 8 and the annular rib are subjected to image acquisition, the acquired image comprises the full-looking inner wall of the sleeve, and the annular rib is ensured to be positioned in the middle of the image; in order to measure and calculate the insertion depth of the reinforcing steel bar, a stainless steel thin tube 6 and a positioning plug 7 can be matched for assistance, the positioning plug is sleeved on the surface of the stainless steel thin tube, the stainless steel thin tube is located in the middle of the positioning plug, the positioning plug is plugged into a grout outlet of an upper layer component and fixes the stainless steel thin tube, so that the position of the stainless steel thin tube is fixed, and an endoscope extends into a sleeve through the stainless steel thin tube, so that the height position of the endoscope is fixed, the insertion depth is convenient to calculate, and the method is shown in fig. 2;
then, measuring the insertion depth in an image, as shown in fig. 3, measuring the distance from the end part of the reinforcing steel bar to the surface of the side view lens through a point-to-surface measuring function, wherein the endoscope is positioned at a height and cannot move up and down due to the arrangement of a stainless steel thin tube, namely, the center position of a grout outlet, namely, the axial height of the grout outlet, the height from the bottom of the sleeve to the center of the grout outlet can be obtained through the model size of the sleeve, and the size of the reinforcing steel bar inserted into the sleeve can be obtained by subtracting the measured distance from the height, namely, the insertion depth of the reinforcing steel bar;
then, deflection measurement is carried out, and referring to fig. 4, an annular rib adjacent to the side-view lens is selected, the annular rib can be clearly imaged, and the upper surface of the annular rib is defined to be positioned on the horizontal position of a designed value of the insertion height of the steel bar during preparation; selecting three points at the intersection of the annular rib and the inner wall of the sleeve to form a reference plane, then selecting a point E and a point F on the edge of the longitudinal rib of the reinforcing steel bar, wherein the selected position of the point E is close to the top of the longitudinal rib, the selected position of the point F is positioned below the point E, measuring the distance H1 from the point E to the reference plane, the distance H2 from the point F to the reference plane and the straight-line distance L1 from the point E to the point F along the longitudinal rib by using the point-to-point measuring function, and then cos alpha is (H2+ H1)/L1; wherein alpha is the deflection angle of the steel bar along the axial direction of the sleeve, and the point E and the point F are positioned on the same longitudinal rib and the edge of the same side;
then, storing the current image to obtain a detection picture, referring to fig. 5, searching the central point of the sleeve and the steel bar in the detection picture, when searching, firstly selecting the annular rib selected in the deflection measurement, randomly selecting a point A at the junction of the annular rib and the inner wall of the sleeve, then selecting a point at the corresponding junction at the other side through a real-time translation size display function to search a point B, when the translation size display of the selected point is maximum, selecting the point as the point B, selecting a point C at the junction near the point A, then selecting a point at the corresponding junction at the other side through the real-time translation size display function to search a point D, when the translation size display of the selected point is maximum, selecting the point as the point D, and intersecting the connecting line of the point A and the point B with the connecting line of the point C to form a central point O1 of the sleeve; in the process of searching the central point of the steel bar, four intersection points formed by the circular body at the end part of the steel bar and the two longitudinal ribs are determined firstly, the four intersection points can be clearly observed in an image, then, connection lines are selected in a staggered mode in a pairwise staggered mode to form an X intersection line, and the intersection point is the central point O2 of the steel bar;
then, taking the central point of the sleeve as a zero point, establishing a cross coordinate axis, referring to fig. 6, wherein the Y axis of the cross coordinate axis is consistent with the axial direction of the slurry outlet, and determining the orientation of the sleeve according to the cross coordinate axis in subsequent modeling; recording the quadrant position of the central point of the steel bar in a quadrant of the cross coordinate axis after the establishment is finished, then connecting the central point of the steel bar with the axis of the cross coordinate axis to form angular separation lines, and measuring the included angle between the angular separation lines and the X axis or the Y axis;
so far, parameters required by modeling can be collected, and then modeling can be carried out; during modeling, according to the size of a steel bar inserted into the sleeve, a lower section body of the sleeve can be drawn from a dot of a datum plane downwards, the size of the steel bar inserted into the sleeve is subtracted from the total length of the sleeve, an upper section body of the sleeve can be drawn, and then according to the design size of the sleeve, a grout outlet, a grouting opening and an internal annular rib can be drawn;
the method comprises the steps that through the size of a steel bar inserted into a sleeve, an axial initial point of the steel bar can be found from a dot of a reference surface downwards, the steel bar is a foundation extending from the center of the sleeve, namely, a connecting line of the initial point to the dot of the reference surface is perpendicular to the reference surface, so that the initial point is conveniently found from modeling, a vertical second reference surface which is perpendicular to the reference surface along an angular line can be established according to the dot, a cross coordinate axis, an angular line and an included angle of the reference surface, and the dot of the reference surface, a central point of the top of the steel bar and the initial point are all in the second reference surface due to the fact that the second reference surface is established along the angular line, and finally, the steel bar is drawn in the second reference surface on the basis of the initial point and the inclined angle;
and finally, performing grouting analysis through finite element software to obtain connection performance data and judging results.
In one embodiment, in order to reduce the measurement error, the deflection verification angle α' of the reinforcing bar in the axial direction of the sleeve is calculated by using the dimension of the reinforcing bar inserted into the sleeve, the dimension of the angular bisector (the dimension can be displayed for the picture when the center point of the reinforcing bar is connected to the axis of the cross coordinate axis to form the angular bisector), the dimension of the line connecting points a and B (the dimension is also measured for the picture), and the diameter (the actual dimension) of the sleeve, the actual length of the angular bisector is first calculated, the actual length of the angular bisector is equal to the diameter of the sleeve/the dimension of the line connecting points a and B, the actual length of the dimension/angular division line of the reinforcing steel bar inserted into the sleeve can be obtained by the pythagorean theorem, then the average deflection angles of alpha' and alpha are obtained, and the reinforcing steel bar is drawn through the average deflection angle, so that the measurement error can be greatly reduced.
In one embodiment, because the endoscope host needs to be operated when the insertion depth and deflection angle are detected, and the problem that the endoscope is dragged to cause movement exists during operation, a locator is further designed, as shown in fig. 7, the locator comprises a protective sleeve, a ferrule 121 and a plastic cable connector 122, the protective sleeve is fixedly arranged on the outer end part, away from the visual opening, of the stainless steel thin tube, two ends of the protective sleeve in the axial direction are respectively provided with a limiting convex ring 123, the ferrule is in a U-shaped structure, extrusion convex parts 124 are symmetrically arranged on the inner walls of two side edges of the ferrule, the two extrusion convex parts are matched with the U-shaped structure to form a C-shaped clamping groove, the ferrule is clamped between the two limiting convex rings of the protective sleeve after being deformed outwards through the C-shaped clamping groove, the ferrule cannot move in the axial direction after being clamped and fixed, and cannot move in the radial direction when no radial external force is applied, and when no circumferential external force is applied, also can't follow the rotation of protective sheath surface, the cutting ferrule bottom still is connected with the bottom of plastic cable joint through linking arm 125, and the axis that the plastic cable connects overlaps with the axis of stainless steel tubule and sets up, and the symmetry is provided with two enhancement convex parts 126 on the both sides limit outer wall of cutting ferrule, strengthens the convex part and fixes with location shell fragment 127 one end, and the location shell fragment other end is connected with plastic cable joint, and two location shell fragments form three point fixing structure with the linking arm cooperation.
When the clamping sleeve is completely clamped into the protective sleeve, the two sides of the clamping sleeve cannot be completely reset, the two sides of the clamping sleeve are still in the outward deformation state, the tensioning effect is effectively ensured, and the mounting stability is ensured; because the both sides limit of cutting ferrule is in the state of outside deformation, consequently the location shell fragment also can be by outside bending and form the effort, the stability of assurance three point fixed knot structure that can be further, when operation plastic cable connects and when operating the endoscope host computer, also can not have the problem of vibration or rocking, more reliable and more stable.
The above embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (6)
1. A component connection detection method based on image recognition and data simulation is characterized in that judgment is carried out after an upper-layer component is installed on the upper surface of a lower-layer component, a steel bar of the lower-layer component extends into a sleeve of the upper-layer component, and a plurality of annular ribs which are uniformly arranged along the axial direction of the sleeve are arranged on the inner wall of the sleeve; the method comprises the following operation steps:
s1, installing a side-looking lens on the endoscope, then extending the endoscope into the sleeve, and acquiring images of the end part of the steel bar and the annular rib, wherein the acquired images comprise the complete picture of the inner wall of the sleeve, and the annular rib is ensured to be positioned in the middle of the images;
s2, measuring the insertion depth in the image, measuring the distance from the end of the steel bar to the surface of the side-view lens through the point-to-surface measuring function, and then calculating the size of the steel bar inserted into the sleeve according to the height of the side-view lens;
s3, performing deflection measurement in an image, selecting an annular rib adjacent to a side-view lens, selecting three points at the intersection of the annular rib and the inner wall of the sleeve to form a reference plane, then selecting a point E and a point F on the edge of the longitudinal rib of the steel bar, wherein the selected position of the point E is close to the top of the longitudinal rib, the selected position of the point F is positioned below the reference plane, measuring the distance H1 from the point E to the reference plane and the distance H2 from the point F to the reference plane by using a point-to-point measuring function, and measuring the straight-line distance L1 from the point E to the point F along the longitudinal rib by using a point-to-surface measuring function, wherein cos alpha is (H2+ H1)/L1; wherein alpha is the deflection angle of the steel bar along the axial direction of the sleeve, and the point E and the point F are positioned on the same longitudinal rib and the edge of the same side;
s4, storing the current image to obtain a detection picture, searching central points of the sleeve and the reinforcing steel bar in the detection picture, establishing a cross coordinate axis on the detection picture after the searching is finished, enabling the axis of the cross coordinate axis to coincide with the central point of the sleeve, recording the quadrant position of the central point of the reinforcing steel bar in the quadrant of the cross coordinate axis, connecting the central point of the reinforcing steel bar with the axis of the cross coordinate axis to form an angular separation line, and measuring an included angle between the angular separation line and the X axis or the Y axis;
s5, modeling is carried out through the size, deflection angle, cross coordinate axis, angular distribution line, included angle, sleeve size and steel bar size of the steel bars inserted into the sleeve, grouting analysis is carried out through finite element software, connection performance data are obtained, and result judgment is carried out.
2. The method as claimed in claim 1, wherein in the searching of the center point of the sleeve, the annular rib selected in S3 is selected, a point a is arbitrarily selected at a boundary between the annular rib and the inner wall of the sleeve, a point B is selected at a corresponding boundary on the other side by a real-time translation size display function, when the translation size of the selected point shows the maximum, the position is selected as the point B, a point C is selected at a boundary near the point a, a point D is selected at a corresponding boundary on the other side by a real-time translation size display function, when the translation size of the selected point shows the maximum, the position is selected as the point D, and a connecting line between the point a and the point B intersects a connecting line between the point C and the point D to form the center point of the sleeve.
3. The method as claimed in claim 1, wherein in the searching for the center point of the steel bar, four intersection points formed by the circular body at the end of the steel bar and the two longitudinal ribs are determined, and the connecting line is selected by two-by-two interleaving to form the center point of the steel bar.
4. The method for detecting the connection of the components based on the image recognition and the data simulation as claimed in claim 1, wherein the Y axis of the cross coordinate axis is consistent with the axial direction of the grout outlet.
5. The component connection detection method based on image recognition and data simulation as claimed in claim 1, further comprising a stainless steel thin tube and a positioning plug, wherein the positioning plug is sleeved on the surface of the stainless steel thin tube, the positioning plug is plugged into the grout outlet of the upper layer component and fixes the stainless steel thin tube, and the endoscope extends into the sleeve through the stainless steel thin tube.
6. The component connection detection method based on image recognition and data simulation as claimed in claim 5, wherein the deflection verification angle α 'of the reinforcing steel bar along the axial direction of the sleeve is calculated by the size of the reinforcing steel bar inserted into the sleeve, the size of the angular line, the size of the line connecting the point A and the point B, and the diameter of the sleeve, the average deflection angles of α' and α are obtained, and modeling is performed by the average deflection angle.
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| CN113920105B (en) * | 2021-10-28 | 2024-07-02 | 中冶赛迪信息技术(重庆)有限公司 | Machine vision-based method, system, equipment and medium for identifying inclined steel in heating furnace |
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