CN111678463B - Method for detecting offset of dowel bars at lower end of steel bar joint of grouting sleeve - Google Patents

Method for detecting offset of dowel bars at lower end of steel bar joint of grouting sleeve Download PDF

Info

Publication number
CN111678463B
CN111678463B CN202010506110.0A CN202010506110A CN111678463B CN 111678463 B CN111678463 B CN 111678463B CN 202010506110 A CN202010506110 A CN 202010506110A CN 111678463 B CN111678463 B CN 111678463B
Authority
CN
China
Prior art keywords
sleeve
grouting
deviation
point
dowel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202010506110.0A
Other languages
Chinese (zh)
Other versions
CN111678463A (en
Inventor
常儇宇
吴玉龙
刘以龙
张军
凌青
顾盛
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KUNSHAN CONSTRUCT ENGINEERING QUALITY TESTING CENTER
Original Assignee
KUNSHAN CONSTRUCT ENGINEERING QUALITY TESTING CENTER
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by KUNSHAN CONSTRUCT ENGINEERING QUALITY TESTING CENTER filed Critical KUNSHAN CONSTRUCT ENGINEERING QUALITY TESTING CENTER
Priority to CN202010506110.0A priority Critical patent/CN111678463B/en
Publication of CN111678463A publication Critical patent/CN111678463A/en
Application granted granted Critical
Publication of CN111678463B publication Critical patent/CN111678463B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/26—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes
    • G01B11/27—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes for testing the alignment of axes

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

The invention discloses a method for detecting the offset of a dowel at the lower end of a steel bar joint of a grouting sleeve, which is carried out after the on-site splicing of prefabricated parts and before the grouting construction of the sleeve, a probe of a three-dimensional measurement endoscope extends into a grouting hole from a grouting opening on the surface of the prefabricated part, 3D images of the grouting opening of a sleeve barrel and the dowel at the lower end are obtained by shooting, then the depth measurement function is started, determining the grouting opening plane of the sleeve barrel by selecting three points, searching a fourth point on the cylindrical surface of the lower end dowel to obtain the actual shortest distance of the point plane, determining the transverse deviation amount and the transverse deviation direction according to the difference between the theoretical shortest distance and the actual shortest distance, and then determining the longitudinal deviation amount and the longitudinal deviation direction by calculating the relative distance between the created central vertical section of the duct and the found fourth point, and finally calculating the total deviation amount and determining the total deviation direction. The invention can accurately detect the deviation condition of the joint bars at the lower end of the steel bar joint of the grouting sleeve and effectively judge the splicing quality.

Description

Method for detecting offset of dowel bars at lower end of steel bar joint of grouting sleeve
Technical Field
The invention relates to the technical field of assembly type building detection, in particular to a method for detecting the deviation of a joint bar at the lower end of a steel bar joint of a grouting sleeve.
Background
The assembly type building has the advantages of high industrialization level, quick installation and construction, labor cost reduction, energy conservation, environmental protection and the like, and is rapidly developed in China. In the fabricated concrete structure, the connection of the members is a key factor regarding the overall quality of the structure. The steel bar sleeve grouting connection is a common steel bar connection mode, and the connection quality of the steel bar sleeve grouting connection is closely related to the steel bar anchoring quality. The existing research shows that the anchoring quality of the steel bars in the sleeve is mainly influenced by the insertion length of the steel bars and the grouting fullness, and is influenced by the deviation of the steel bars to a certain extent, the deviation of the steel bars in the sleeve is relatively small to influence the anchoring quality, and the connection performance is reduced by about 10% when the deviation of the steel bars exists. Because the connection design of the node has certain redundancy, although the deviation of the reinforcing steel bars exists, the connection performance can still meet the requirement generally, and therefore, the problem of the deviation of the reinforcing steel bars is often ignored.
However, practical engineering and further intensive studies have shown that the weakening of the anchoring quality of the grouted connection to the steel bar sleeve is amplified when there is a defect in the deviation of the steel bars, in the presence of either or both of insufficient insertion length or insufficient fullness of the steel bars. For example, through detection, the insertion length of the steel bar of the connecting node is less than 8d, but the designed rechecking check calculation can just meet the bearing requirement (close to a critical value), at the moment, if the quality check is directly passed, great potential safety hazard is brought, and the requirement can not be met after the bearing capacity of the node is reduced if the steel bar deviates. Most suitably, the deviation of the steel bars should be detected, the data is provided to a design institute for comprehensive checking, and if the bearing capacity requirement can still be met, the quality can be checked, otherwise, the reinforcement design and reinforcement are required, and the quality can be checked. Therefore, when the insertion length of the reinforcing steel bar does not reach the standard, especially when the detection result is close to the critical value, the deviation of the reinforcing steel bar must be considered. As the importance is attached, the former two methods have developed corresponding effective detection methods and are written in the technical code DB 32/T3754-2020 of the Standard for testing integral concrete structures in Jiangsu province, but the problem of the deviation of the reinforcing steel bars is not attached to the importance, so that the corresponding detection methods and means for quantitatively detecting the deviation of the reinforcing steel bars are not available at present.
For the prefabricated component connected by the full grouting sleeve, the connecting steel bars at the prefabricated end at the upper part of the prefabricated component are fixed at the upper part of the sleeve by rubber plugs during the component manufacturing, and the phenomenon of steel bar deviation generally cannot occur; for the prefabricated component connected by the semi-grouting sleeve, the upper prefabricated end connecting steel bar of the prefabricated component is fixed by adopting threaded connection during the component manufacturing, and the deviation phenomenon can not occur. However, because the position of the steel bar of the prefabricated part is deviated from the design requirement when the prefabricated part leaves the factory, the deviation of the steel bar inserted into the lower end of the steel bar joint of the grouting sleeve may occur due to the deviation of the steel bar position from the design requirement and the deviation of the installation on site.
Accordingly, there is a need for a method for detecting the misalignment of the lower end of the steel bar joint of the grouting sleeve.
Disclosure of Invention
The invention aims to provide a method for detecting the deviation of the dowel bars at the lower end of the steel bar joint of a grouting sleeve, which can accurately obtain the deviation of the dowel bars at the lower end and effectively judge the assembling quality.
In order to solve the technical problem, the invention provides a method for detecting the deviation of a joint bar at the lower end of a steel bar joint of a grouting sleeve, which is characterized by being carried out after prefabricated parts are spliced on site and before sleeve grouting construction, and comprising the following steps of:
s1: acquiring an image, extending a probe of a three-dimensional measurement endoscope into a grouting hole channel from a grouting opening on the surface of a prefabricated part, imaging the grouting opening of the sleeve barrel and a lower-end dowel bar in the sleeve through the three-dimensional measurement endoscope when the probe reaches a position close to the grouting opening of the sleeve barrel, and shooting to obtain a 3D image when the selected position is clear;
s2: deviation detection, namely measuring the transverse deviation and the longitudinal deviation of the lower-end dowel according to the 3D image, and obtaining a transverse deviation amount x, a transverse deviation direction, a longitudinal deviation amount y and a longitudinal deviation direction;
firstly, detecting the transverse deviation x, wherein the method comprises the following steps:
opening the depth measurement function of the three-dimensional measurement endoscope on the shot 3D image, randomly selecting three points at the grout outlet of the sleeve barrel on the 3D image, obtaining a grout inlet plane of the sleeve barrel from a plane formed by the selected three points, searching a fourth point on the cylindrical surface of the lower-end dowel bar through the real-time translation depth value display function in the depth measurement function, translating the fourth point in the transverse direction until the real-time depth value between the fourth point and the grout inlet plane of the sleeve barrel is displayed as a minimum value, selecting the current position as the fourth point, namely obtaining an edge point of the cylindrical surface of the lower-end dowel bar closest to the grout inlet plane of the sleeve barrel, and measuring to obtain the actually-measured shortest distance x from the cylindrical surface of the lower-end dowel bar to the grout inlet plane of the sleeve barrel1；
When the selected fourth point is positioned on the crescent rib, the selected fourth point is moved upwards or downwards along the longitudinal direction of the fourth point to the cylindrical surface of the lower end dowel for reselection;
calculating the actual measurement shortest distance x1When the lower end joint bar is arranged at the center in the sleeve, the theoretical shortest distance x from the surface of the lower end steel bar to the plane of the grouting opening of the sleeve barrel body0Taking the difference, obtaining the transverse offset x of the lower end dowel, namely x ═ x1-x0；
Judging whether deviation occurs or not according to the transverse deviation amount x, judging that the lower-end dowel bars are located in the transverse deviation direction according to the positive and negative values of the transverse deviation amount x when deviation occurs, wherein the lower-end dowel bars are close to the probe and are in front deviation when the deviation is a negative value, and the lower-end dowel bars are far away from the probe and are in rear deviation when the deviation is a positive value;
and then detecting the longitudinal deviation y by the following method:
on the basis of shooting to obtain a 3D image, selecting any point in the grouting hole on the uppermost end point and the lowermost end point in the vertical direction at the grouting hole of the sleeve barrel and on the same vertical surface, obtaining a central vertical section of the hole by a plane formed by the selected three points, and then performing matching measurement with a fourth point selected during detection of the transverse offset x to obtain the relative vertical distance y from the fourth point to the central vertical section of the hole1The longitudinal offset y of the lower end dowel can be obtained, namely, y is equal to y1；
Judging whether deviation occurs or not according to the longitudinal deviation amount y, judging that the lower-end dowel bar is located in the longitudinal deviation direction according to the position of the fourth point relative to the central vertical section of the duct when deviation occurs, judging that the lower-end dowel bar is located in the left deviation direction when the fourth point is located on the left side of the central vertical section of the duct, and judging that the lower-end dowel bar is located in the right deviation direction when the fourth point is located on the right side of the central vertical section of the duct;
s3: calculating the total deviation amount and determining the total deviation direction; the total offset z of the lower end dowel is the oblique length of the transverse offset x and the longitudinal offset y, and the total offset of the lower end dowel can be calculated according to the pythagorean theorem
Figure BDA0002526600900000041
And judging the total deviation direction according to the deviation direction of the lower end dowel bars in the transverse direction and the deviation direction in the longitudinal direction.
Furthermore, a forward-looking three-dimensional stereo measurement lens is mounted on a probe of the three-dimensional stereo measurement endoscope.
Further, when the grouting hole channel is formed by sleeving the PVC pipe outside the sleeve grouting nozzle, the end part of the sleeve grouting nozzle, which is positioned on one side of the lower-end dowel, is a selected point position of the grouting opening plane of the sleeve barrel and the central vertical section of the hole channel.
Further, when the grouting hole is formed by inserting the PVC pipe into the sleeve grouting nozzle, the limiting blocking part inside the sleeve barrel grouting opening is the point selecting position of the sleeve barrel grouting opening plane and the hole center vertical cross section.
Furthermore, when the cylindrical surface in the middle of the horizontal plane of the lower-end dowel bar is provided with the longitudinal ribs, the fourth point is selected to be on the longitudinal ribs, and the theoretical shortest distance x from the surface of the lower-end steel bar to the plane of the grouting opening of the sleeve barrel body is formed when the lower-end dowel bar is arranged at the center in the sleeve0The thickness t of the longitudinal rib is subtracted, that is, the lateral offset x of the lower end dowel is x1-(x0-t)。
Further, the theoretical shortest distance x0Obtained by the following method: selecting a group of sleeve samples and lower-end dowel bar samples which adopt the same type and specification with the measured prefabricated part, and measuring the diameter of the cylindrical surface of the lower-end dowel bar sample to be D1Measuring the distance D from the center of the sleeve to the grout hole of the sleeve barrel2Theoretical shortest distance x0＝D2-(D1/2)。
Further, the theoretical shortest distance x0Obtained by the following method: the grouting sleeve is used for manufacturing the grouting sleeve with high dimensional accuracy, and the diameter D of the lower end dowel bar is obtained according to the design drawing1And the distance from the center of the sleeve to the grout hole of the sleeve barrel is D2Measuring the distance D from the center of the sleeve to the grout hole of the sleeve barrel2Theoretical shortest distance x0＝D2-(D1/2)。
The three-dimensional measurement endoscope comprises a rigid sleeve and a central hole rubber plug, wherein the central hole rubber plug is sleeved on the surface of the rigid sleeve, when an image is acquired, the central hole rubber plug is plugged into a grouting hole in the surface of a prefabricated part, the rigid sleeve is positioned at the axial position of the grouting hole, and then a probe of the three-dimensional measurement endoscope extends into the rigid sleeve and reaches a grouting hole channel to shoot a 3D image.
The invention has the beneficial effects that:
1. the invention utilizes the characteristic of high dimensional accuracy of the grouting sleeve, and respectively measures the relative distance from the surface of the lower steel bar to two vertical reference planes by an endoscope three-dimensional dimension measurement technology, thereby realizing the detection of the transverse and longitudinal deflection amount and the deflection direction of the steel bar.
2. Through ingenious measurement sequence design, the fourth point found in the detection of the transverse offset x is used as the selected point for the detection of the longitudinal offset y, the calculation model is met, and the operation is convenient and fast, and the result is reliable.
3. 3D images of the target position are shot through the foresight three-dimensional measuring lens, the coordinate position of the lower end dowel bar in the sleeve is accurately calculated through the measuring function, the detection is clear and visual, and the result is quantized.
4. Rigid sleeve pipe and rubber buffer can make endoscope head stretch into along grout mouthful center, and the visual angle is difficult to be sheltered from and can strengthen the stability when shooing to measuring precision has been improved.
5. The detection method provided by the invention can be suitable for full grouting sleeves and half grouting sleeves of different specifications and models, and is high in applicability.
Drawings
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a schematic view of two rubber positioning plugs according to the present invention;
FIG. 3 is a schematic illustration of the measurement operation of the present invention without misalignment;
FIG. 4 is a graph showing the measurement results of the present invention without being misaligned;
FIG. 5 is a schematic illustration of the present invention in a measuring operation with lateral forward misalignment;
FIG. 6 is a graph showing the measurement results of the present invention in a lateral forward misalignment;
FIG. 7 is a graph showing the measurement results of the oblique deviation according to the present invention;
FIG. 8 is a schematic view of the present invention using an auxiliary device to measure misalignment.
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, an embodiment of the method for detecting the misalignment of the steel bar inserted at the lower end of the steel bar joint of the grouting sleeve according to the present invention is to take a sleeve of a GT16 brand as an example for operation verification, wherein the grouting hole is formed by sleeving a PVC pipe outside the grouting nozzle 112 of the sleeve, the grouting nozzle of the sleeve is generally of a split design, and the grouting nozzle of the sleeve is screwed on a corresponding position of the sleeve, so that the edge of the grouting nozzle of the sleeve on one side of the steel bar inserted at the lower end is a grouting opening of the sleeve barrel, i.e., a selected point position of a grouting opening plane of the sleeve barrel and a central vertical section of the hole, and relative parallelism can. In order to ensure the convenience of verification operation, the deviation position of the lower-end dowel with the nominal diameter of 16mm can be preset, the diameter of the cylindrical surface of the lower-end dowel is 15.24mm, the lower-end dowel is fixed by the aid of a rubber positioning plug 111, the rubber positioning plugs are two, as shown in fig. 2, one is a middle hole, the other is a deviation hole, the lower-end dowel is arranged in the middle hole in a penetrating manner and fixed by the rubber positioning plug, and the rubber positioning plug is plugged into the bottom of the sleeve for fixing, so that the relative position of the lower-end dowel and the sleeve is fixed;
based on above-mentioned supplementary experimental apparatus's cooperation, insert the rubber location stopper of middle trompil with the lower extreme dowel steel, the rubber location stopper through middle trompil stretches into sleeve central point and puts the department and fix, detects the operation as operating mode one with this operating mode:
in the definition of the offset position, the angle of view of the image screen captured by the three-dimensional stereo measuring endoscope is used as a reference, the direction close to the three-dimensional stereo measuring endoscope is forward offset, the direction far from the three-dimensional stereo measuring endoscope is backward offset, the left side of the image screen is left offset, and the right side of the image screen is right offset.
The relative position of the lower end dowel steel and the sleeve is fixed to simulate the structural form after the on-site splicing of the prefabricated part 1 is completed and before the sleeve grouting construction, and the method mainly comprises the following steps:
installing a forward-looking three-dimensional measurement lens on a probe of a three-dimensional measurement endoscope, extending the probe of the three-dimensional measurement endoscope 2 into a grouting hole channel 4 from a grouting opening 3 on the surface of a prefabricated part, imaging a sleeve barrel grouting opening 5 and a lower end dowel bar 6 in a sleeve through the three-dimensional measurement endoscope when the probe reaches a position close to the sleeve barrel grouting opening, and shooting to obtain a 3D image when the selected position is clear as shown in figure 3 and figure 4;
measuring the transverse deviation and the longitudinal deviation of the lower-end dowel according to the 3D image, and obtaining a transverse deviation amount x and a longitudinal deviation amount y, wherein in the measuring process, the measuring of the transverse deviation amount x is taken as the first step, on the 3D image obtained by shooting, the depth measuring function of the three-dimensional stereo measuring endoscope is opened, three points are randomly selected at a grout inlet of the sleeve barrel on the 3D image, the plane formed by the selected three points is used for obtaining a grout inlet plane of the sleeve barrel, and the grout channel is formed by sleeving a PVC pipe outside the grout inlet of the sleeve, and the randomly selected three points are positioned on one side edge of the lower-end dowel at the grout inlet of the sleeve barrel; through the real-time translation depth value display function in the degree of depth measurement function seek the fourth point on the cylindrical surface of lower extreme dowel, the fourth point of translation is horizontal, because cylindrical surface is tangent with the planar parallel plane of sleeve barrel grout mouthful, consequently there is a minimum and a set of data with minimum bilateral symmetry, during the translation, there are two kinds of situations to explain respectively:
1. moving towards the left side, wherein the real-time depth value moving towards the left side is increased, the minimum value is located at the right side, the left movement is stopped, the movement towards the right side is performed, when the real-time depth value moving towards the right side is changed from decreasing to increasing, the right movement is stopped, the node position of the depth value changing from decreasing to increasing is found at the adjacent left side, and the position is the real-time depth value between the fourth point and the grouting opening plane of the sleeve barrel and is displayed as the minimum value;
2. when the real-time depth value moving towards the left side is smaller, continuing to move leftwards until the real-time depth value moving towards the left side is changed from smaller to larger, stopping moving leftwards, finding a node position of the depth value changed from smaller to larger on the adjacent right side, wherein the position is the real-time depth value between the fourth point and the grouting opening plane of the sleeve barrel body and is displayed as the minimum value;
the directions of left or right movement described above are not limiting, but are merely illustrative of relative orientations;
selecting the current position as a fourth point to obtain an edge point of the cylindrical surface of the lower end dowel closest to the grouting opening plane of the sleeve barrel, and measuring to obtain an actually measured shortest distance x from the cylindrical surface of the lower end dowel to the grouting opening plane of the sleeve barrel1Calculating the actually measured shortest distance x1When the lower end joint bar is arranged at the center in the sleeve, the theoretical shortest distance x from the surface of the lower end steel bar to the plane of the grouting opening of the sleeve barrel body0Taking the difference, obtaining the transverse offset x of the lower end dowel, namely x ═ x1-x0；
Wherein, the theoretical shortest distance x from the surface of the lower end steel bar to the grouting opening plane of the sleeve barrel0Selecting a group of sleeve samples and lower-end dowel bar samples which adopt the same model and specification as the measured prefabricated part, and measuring the diameter of the cylindrical surface of the lower-end dowel bar sample to be D1Measuring the distance D from the center of the sleeve to the grout hole of the sleeve barrel2Theoretical shortest distance x0＝D2-(D1/2)＝13.62-(15.24/2)＝6mm。
Then, measuring the longitudinal deviation y, on the basis that any point in the grouting hole in the uppermost end point and the lowermost end point in the vertical direction and the grouting hole on the same vertical plane is selected at the grouting hole of the sleeve barrel on the basis that the point position is selected in the process of measuring the transverse deviation x of the lower-end dowel, obtaining the central vertical section of the hole by the plane formed by the selected three points, and then performing matching calculation with the position of a fourth point in the transverse deviation x of the lower-end dowel to obtain the relative vertical distance y from the fourth point to the central vertical section of the hole1The longitudinal offset y of the lower end dowel can be obtained, namely, y is equal to y1；
The working conditions in the four sleeves are measured respectively according to the above, and thenThe offset direction of the lower-end dowel can be easily distinguished according to the transverse offset x and the longitudinal offset y, the offset z of the lower-end dowel is obtained by calculating the oblique length of the transverse offset x and the longitudinal offset y, and the total offset of the lower-end dowel is calculated according to the Pythagorean theorem
Figure BDA0002526600900000091
Through the accurate data of deviation direction and deviation volume, can give the institute of design and carry out the check and calculation again.
Specifically, in a first working condition, referring to fig. 3 and 4, a rubber positioning plug with a hole in the middle is used for positioning the lower-end dowel, the eccentricity e is 0, the measured shortest distance from the surface of the lower-end dowel to the grouting opening plane of the sleeve barrel is measured to be 6.09mm, the relative vertical distance from the center of the lower-end dowel to the central vertical section of the hole is measured to be 0.08mm, the left and right deviation directions can be distinguished according to the central vertical section of the hole in a shot 3D image, and the front and back deviation directions can be distinguished according to the positive and negative difference of the transverse deviation x;
the transverse offset x of the lower end dowel is x1-x0When the displacement amount is as small as 0.09mm, the displacement amount is as small as 0, and it is considered that the displacement is not in the front-rear direction.
Since the longitudinal misalignment y of the lower-end dowels is 0.08mm, the misalignment is extremely small and close to 0, and it is considered that the dowels are not misaligned in the left-right direction.
Therefore, in the first working condition, the surface of the lower end dowel is considered as not deviated and is consistent with the actual working condition.
Insert the rubber location stopper of off normal trompil with the lower extreme dowel steel, the rubber location stopper through the off normal trompil stretches into before the sleeve off normal position department and fixed, and the size measurement when being located the position of rubber location stopper and preparing is checked according to the off normal trompil, obtains that the eccentricity e is 3mm, detects the operation as operating mode two with this operating mode:
and in the second working condition, as shown in fig. 5 and 6, the measured shortest distance from the surface of the lower end dowel to the grouting opening plane of the sleeve barrel is displayed to be 3.06mm through measurement, and the relative vertical distance from the center of the lower end dowel to the vertical section of the center of the pore channel is displayed to be 0.03 mm.
The transverse offset x of the lower end dowel is x1-x0And (3.06-6) — 2.94mm, judging that the lateral deviation exists, the deviation distance is 2.94mm, the lateral deviation amount x is a negative value and represents that the lateral deviation is close to the grouting opening plane of the sleeve barrel, and judging that the deviation direction is front deviation.
Since the longitudinal misalignment y of the lower-end dowels is 0.03mm, the misalignment is extremely small and close to 0, and it is considered that the dowels are not misaligned in the left-right direction.
Therefore, in the second working condition, the lower end dowel steel is regarded as the front offset, and the total offset of the lower end dowel steel
Figure BDA0002526600900000101
Is consistent with the actual working condition.
Insert the rubber location stopper of off normal trompil with the lower extreme dowel steel, the rubber location stopper through the off normal trompil stretches into before the sleeve off normal position department and fixed, and the size measurement when being located the position of rubber location stopper and preparing is checked according to the off normal trompil, obtains that the eccentricity e is 3mm, detects the operation as operating mode three with this operating mode:
the operation steps of the working condition three are consistent with those of the working condition one, and detailed description is not needed, in the working condition three, as shown in fig. 7, the measured shortest distance from the surface of the lower end dowel to the grouting opening plane of the sleeve barrel is obtained through measurement and displayed to be 7.56mm, and the relative vertical distance from the center of the lower end dowel to the vertical section of the center of the duct is obtained and displayed to be 2.47 mm;
the transverse offset x of the lower end dowel is x1-x0And 7.56-6-1.56 mm, judging that the lateral deviation exists, judging that the deviation distance is 1.56mm, and judging that the deviation direction is the rear deviation, wherein the lateral deviation x is a positive value and represents that the lateral deviation is far away from the grouting opening plane of the sleeve barrel body.
Because the longitudinal deviation y of the lower-end dowel is 2.47mm, the longitudinal deviation is judged to exist, the deviation distance is 2.47mm, a fourth point which can be obtained from the 3D image through the central vertical section of the pore channel is located on the left side, and the deviation direction is judged to be left deviation.
Therefore, in the third working condition, the lower end dowel steel is considered to be deviated towards the left rear direction,deflection of lower end dowel
Figure BDA0002526600900000102
Is consistent with the actual working condition.
In summary, the method is high in measurement accuracy, good in data stability and capable of being popularized and used.
In one embodiment, in the process of selecting the fourth point by detecting the lateral offset x, when the selected fourth point is located on the crescent rib, the selected fourth point moves upwards or downwards along the longitudinal direction of the fourth point to the cylindrical surface of the lower-end dowel for reselection, so that the crescent rib is avoided, and the measurement accuracy is prevented from being reduced due to the fact that the crescent rib is different in thickness.
In an embodiment, when the grouting duct is formed by inserting the PVC pipe into the sleeve grouting nozzle, the end of the PVC pipe abuts against a limiting stop part inside the grouting opening of the sleeve barrel, as shown in fig. 8, the limiting stop part is a point-selected position of the grouting opening plane of the sleeve barrel and the central vertical cross-section of the duct, and can effectively ensure relative parallelism.
In one embodiment, when the cylindrical surface in the middle of the horizontal plane of the lower end dowel bar is provided with the longitudinal rib, the fourth point is selected to be on the longitudinal rib, and the theoretical shortest distance x from the surface of the lower end steel bar to the grouting opening plane of the sleeve barrel body is formed when the lower end dowel bar is arranged at the center in the sleeve0The thickness t of the longitudinal rib is subtracted, that is, the lateral offset x of the lower end dowel is x1-(x0-t) to ensure the accuracy of the dimensional data.
In one embodiment, the theoretical shortest distance x0It can also be obtained by: the grouting sleeve is used for manufacturing the grouting sleeve with high dimensional accuracy, and the diameter D of the lower end dowel bar is obtained according to the design drawing1And the distance from the center of the sleeve to the grout hole of the sleeve barrel is D2Measuring the distance D from the center of the sleeve to the grout hole of the sleeve barrel2Theoretical shortest distance x0＝D2-(D1And 2), the acquisition is more convenient and faster, and errors caused by artificial measurement are reduced.
In an embodiment, referring to fig. 8, in order to improve the quality of the 3D image and reduce the influence caused by hand shaking and oblique viewing, an auxiliary device is further designed, the auxiliary device includes a rigid sleeve 7 and a central hole rubber plug 8, the central hole rubber plug is sleeved on the surface of the rigid sleeve, when the image is acquired, the rubber plug of the central hole is plugged into the grout hole on the surface of the prefabricated part, the rigid sleeve is positioned at the axial position of the grout hole, then a probe of the three-dimensional measurement endoscope extends into the rigid casing and reaches a grouting pore channel to shoot a 3D image, the rigid sleeve can be fixed in the center on the axial position of the grouting pore passage through the central hole rubber plug, therefore, the three-dimensional measurement endoscope can only move in the axial pore channel of the rigid sleeve, has support, does not shake, can ensure vertical framing, and ensures detection precision.
The above-mentioned 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 (8)

1. The method for detecting the deviation of the joint bars at the lower end of the steel bar joint of the grouting sleeve is characterized by being carried out after the on-site splicing of prefabricated parts is completed and before the grouting construction of the sleeve, and comprises the following steps of:
s1: acquiring an image, extending a probe of a three-dimensional measurement endoscope into a grouting hole channel from a grouting opening on the surface of a prefabricated part, imaging the grouting opening of the sleeve barrel and a lower-end dowel bar in the sleeve through the three-dimensional measurement endoscope when the probe reaches a position close to the grouting opening of the sleeve barrel, and shooting to obtain a 3D image when the selected position is clear;
s2: deviation detection, namely measuring the transverse deviation and the longitudinal deviation of the lower-end dowel according to the 3D image, and obtaining a transverse deviation amount x, a transverse deviation direction, a longitudinal deviation amount y and a longitudinal deviation direction;
firstly, detecting the transverse deviation x, wherein the method comprises the following steps:
opening the depth measurement function of the three-dimensional stereo measurement endoscope on the shot 3D image, and performing depth measurement on the 3D imageRandomly selecting three points at a grout outlet of the sleeve barrel on an image, obtaining a grout outlet plane of the sleeve barrel by a plane formed by the selected three points, searching a fourth point on the cylindrical surface of the lower-end dowel through a real-time translation depth value display function in a depth measurement function, translating the fourth point in the horizontal direction until the real-time depth value between the fourth point and the grout outlet plane of the sleeve barrel is displayed as a minimum value, selecting the current position as the fourth point, namely obtaining an edge point of the cylindrical surface of the lower-end dowel closest to the grout outlet plane of the sleeve barrel, and measuring to obtain the shortest actual measurement distance x from the cylindrical surface of the lower-end dowel to the grout outlet plane of the sleeve barrel1；
When the selected fourth point is positioned on the crescent rib, the selected fourth point is moved upwards or downwards along the longitudinal direction of the fourth point to the cylindrical surface of the lower end dowel for reselection;
calculating the actual measurement shortest distance x1When the lower end joint bar is arranged at the center in the sleeve, the theoretical shortest distance x from the surface of the lower end steel bar to the plane of the grouting opening of the sleeve barrel body0Making a difference to obtain the transverse offset x of the lower end dowel bar, namely x = x1-x0；
Judging whether deviation occurs or not according to the transverse deviation amount x, judging that the lower-end dowel bars are located in the transverse deviation direction according to the positive and negative values of the transverse deviation amount x when deviation occurs, wherein the lower-end dowel bars are close to the probe and are in front deviation when the deviation is a negative value, and the lower-end dowel bars are far away from the probe and are in rear deviation when the deviation is a positive value;
and then detecting the longitudinal deviation y by the following method:
on the basis of shooting to obtain a 3D image, selecting any point in the grouting hole on the uppermost end point and the lowermost end point in the vertical direction at the grouting hole of the sleeve barrel and on the same vertical surface, obtaining a central vertical section of the hole by a plane formed by the selected three points, and then performing matching measurement with a fourth point selected during detection of the transverse offset x to obtain the relative vertical distance y from the fourth point to the central vertical section of the hole1The longitudinal offset y of the lower end dowel bar can be obtained, namely y = y1；
Judging whether deviation occurs or not according to the longitudinal deviation amount y, judging that the lower-end dowel bar is located in the longitudinal deviation direction according to the position of the fourth point relative to the central vertical section of the duct when deviation occurs, judging that the lower-end dowel bar is located in the left deviation direction when the fourth point is located on the left side of the central vertical section of the duct, and judging that the lower-end dowel bar is located in the right deviation direction when the fourth point is located on the right side of the central vertical section of the duct;
s3: calculating the total deviation amount and determining the total deviation direction; the total offset z of the lower end dowel is the slant length of the transverse offset x and the longitudinal offset y, and the total offset z =of the lower end dowel can be calculated according to the pythagorean theorem
Figure 967068DEST_PATH_IMAGE001
(ii) a And judging the total deviation direction according to the deviation direction of the lower end dowel bars in the transverse direction and the deviation direction in the longitudinal direction.
2. The method for detecting the misalignment of the joint bars at the lower end of the steel bar joint of the grouting sleeve according to claim 1, wherein a forward-looking three-dimensional stereo measuring lens is installed on the probe of the three-dimensional stereo measuring endoscope.
3. The method for detecting the misalignment of the lower joint bars of the steel bar joints of the grouting sleeves as claimed in claim 1, wherein when the grouting hole is formed by sleeving a PVC pipe outside the grouting nozzle of the sleeve, the end part of the grouting nozzle of the sleeve, which is positioned at one side of the lower joint bars, is a selected point position of the grouting opening plane of the sleeve barrel and the central vertical section of the hole.
4. The method for detecting the misalignment of the dowel bars at the lower end of the steel bar joint of the grouting sleeve as claimed in claim 1, wherein when the grouting hole is formed by inserting the PVC pipe inside the grouting nozzle of the sleeve, the limiting stop part inside the grouting opening of the sleeve barrel is the point selection position of the plane of the grouting opening of the sleeve barrel and the central vertical section of the hole.
5. The method of claim 1, wherein the fourth point is selected when the lower end of the lower joint has a longitudinal rib on the cylindrical surface of the lower joint in the middle of the horizontal planeThe theoretical shortest distance x from the surface of the lower end steel bar to the plane of the grouting opening of the sleeve barrel body is selected on the longitudinal rib when the lower end dowel bar is arranged at the center in the sleeve0The thickness t of the longitudinal rib, i.e. the lateral offset x = x of the lower end dowel, needs to be subtracted1-（x0-t）。
6. The method of detecting the misalignment of the dowels at the lower end of the rebar junction of a grouted sleeve of claim 1, wherein the theoretical minimum distance x is0Obtained by the following method: selecting a group of sleeve samples and lower-end dowel bar samples which adopt the same type and specification with the measured prefabricated part, and measuring the diameter of the cylindrical surface of the lower-end dowel bar sample to be D1Measuring the distance D from the center of the sleeve to the grout hole of the sleeve barrel2Theoretical shortest distance x0=D2-(D1/2)。
7. The method of detecting the misalignment of the dowels at the lower end of the rebar junction of a grouted sleeve of claim 1, wherein the theoretical minimum distance x is0Obtained by the following method: the grouting sleeve is used for manufacturing the grouting sleeve with high dimensional accuracy, and the diameter D of the lower end dowel bar is obtained according to the design drawing1And the distance from the center of the sleeve to the grout hole of the sleeve barrel is D2Theoretical shortest distance x0=D2-(D1/2)。
8. The method for detecting the misalignment of the joint bars at the lower end of the steel bar joint of the grouting sleeve according to claim 1, further comprising a rigid sleeve and a central hole rubber plug, wherein the central hole rubber plug is sleeved on the surface of the rigid sleeve, the central hole rubber plug is plugged into a grouting hole in the surface of the prefabricated part when an image is obtained, the rigid sleeve is positioned at the axial position of the grouting hole, and then a probe of the three-dimensional measurement endoscope extends into the grouting hole from the rigid sleeve to shoot a 3D image.
CN202010506110.0A 2020-06-05 2020-06-05 Method for detecting offset of dowel bars at lower end of steel bar joint of grouting sleeve Active CN111678463B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010506110.0A CN111678463B (en) 2020-06-05 2020-06-05 Method for detecting offset of dowel bars at lower end of steel bar joint of grouting sleeve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010506110.0A CN111678463B (en) 2020-06-05 2020-06-05 Method for detecting offset of dowel bars at lower end of steel bar joint of grouting sleeve

Publications (2)

Publication Number Publication Date
CN111678463A CN111678463A (en) 2020-09-18
CN111678463B true CN111678463B (en) 2021-02-02

Family

ID=72435014

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010506110.0A Active CN111678463B (en) 2020-06-05 2020-06-05 Method for detecting offset of dowel bars at lower end of steel bar joint of grouting sleeve

Country Status (1)

Country Link
CN (1) CN111678463B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113030098B (en) * 2021-02-26 2024-05-17 上海市建筑科学研究院有限公司 Method for detecting and processing sleeve connection reinforcing steel bar cutoff
CN112945107B (en) * 2021-04-01 2022-05-06 昆山泊松建筑科技有限公司 Component connection detection method based on image recognition and data simulation

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107204011A (en) * 2017-06-23 2017-09-26 万维云视（上海）数码科技有限公司 A kind of depth drawing generating method and device
CN110530297B (en) * 2018-05-23 2020-11-03 中国科学院长春光学精密机械与物理研究所 Method for judging laser beam collimation and shearing interferometer adopting same
CN109141274B (en) * 2018-08-01 2019-05-03 昆山市建设工程质量检测中心 A method of reinforcing bar insertion depth is connected in half grout sleeve splice of detection
CN108982535B (en) * 2018-08-01 2019-03-19 昆山市建设工程质量检测中心 Sleeve grouting plumpness detection method based on endoscope three-dimensional dimension measuring technique
CN109211909B (en) * 2018-11-12 2021-01-22 上海市建筑科学研究院 Sleeve grouting fullness detection method based on core drilling pore-forming
CN110455227A (en) * 2019-09-17 2019-11-15 中国科学院长春光学精密机械与物理研究所 Four through axial bore coaxiality error detection method of telescope

Also Published As

Publication number Publication date
CN111678463A (en) 2020-09-18

Similar Documents

Publication Publication Date Title
CN111678463B (en) Method for detecting offset of dowel bars at lower end of steel bar joint of grouting sleeve
CN108663006B (en) A method of detecting connection reinforcing bar insertion depth in full grout sleeve splice
CN109141274B (en) A method of reinforcing bar insertion depth is connected in half grout sleeve splice of detection
CN115046537B (en) Underwater check method for closure attitude of immersed tunnel
CN107238379B (en) Measuring for verticality method
CN206635833U (en) Detect imager in the hole of pile for prestressed pipe
CN109493380B (en) Method for calculating area of irregular shear surface in rock joint surface shear test
CN108612107B (en) Simulation method for excavation process of cantilever type retaining structure foundation pit
CN109226646A (en) The rivet of autoplugger riveting enters hole and heading height online test method and device
CN108759636A (en) Multifunctional ruler and application method for the pre-buried joint bar detection of prefabricated assembled wall column
CN112945107B (en) Component connection detection method based on image recognition and data simulation
KR102433682B1 (en) Multipurpose total inspection device and digital construction method of multi-step grouting with steel pipe using the same
CN204085813U (en) A kind of minor diameter tested pipe fitting sealed end face air pressure compactness pick-up unit
CN206905686U (en) A kind of sleeve testing apparatus for verticality and measuring for verticality structure
CN110487349B (en) Method for detecting height of inner slurry surface of grouting sleeve by applying standard thickness weight
CN111980080B (en) A deviational survey tubular construction for geotechnical engineering detects
CN210827615U (en) Foundation pile static load experiment displacement observation benchmark device
CN210739879U (en) Spirit level support for engineering cost
CN108872547B (en) Device and method for detecting whether grouting of full grouting sleeve is full
CN213632917U (en) Sleeve device for inspecting grouting filling degree
JP3579830B2 (en) Guide line for optical ground displacement measurement
CN110514263B (en) Method for detecting grout surface height of grouting sleeve by establishing standard curve
CN209189736U (en) The rivet of autoplugger riveting enters hole and heading height on-line measuring device
CN106595590A (en) Dual-axis inclinometer based on balance bar principle
JP4096090B2 (en) Pipe joint shrinkage allowance measuring device

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant