CN106124535B - The reinforcing bar connection grout sleeve compactness inspection method of concrete cover - Google Patents
The reinforcing bar connection grout sleeve compactness inspection method of concrete cover Download PDFInfo
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- CN106124535B CN106124535B CN201610420047.2A CN201610420047A CN106124535B CN 106124535 B CN106124535 B CN 106124535B CN 201610420047 A CN201610420047 A CN 201610420047A CN 106124535 B CN106124535 B CN 106124535B
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Abstract
Reinforcing bar connection grout sleeve faultage image with concrete cover; it is positioned first by Hough transform to ring artifact; and ring artifact is removed using linear interpolation method; then the gray value of each material is further adjusted; repartition each substance interface; and it is reassembled as the grout sleeve longitudal section scan image with higher identification and reliability, the Grouted density of sleeve inner is finally judged according to grey value profile.This method can be obtained to be influenced with the scanning compared with high-resolution, obtains the detection data of the reinforced bar sleeve Grouted density of reliability, thus to guarantee that the construction quality of reinforced bar sleeve grouting connection provides technical support.
Description
Technical field
It is specifically exactly to be related to a kind of reinforcing bar connection with concrete cover the invention belongs to build detection technique field
With grout sleeve compactness inspection method, the efficiency and accuracy of reinforcing bar connection grout sleeve compactness inspection are improved.
Background technique
Prefabricated concrete structure is one of primary structure pattern of industrialized building, for prefabricated concrete structure
Speech, core is steel bar stress interconnection technique.Currently, the connection of steel bar stress generallys use sleeve in prefabricated concrete structure
Grouting connection.Since reinforced bar sleeve grouting connecting structure is complicated, the detection of internal flaw is even more important, and is commonly used in inspection at present
Survey defect in concrete method include ultrasonic method, Impact echo, echolation, instantaneous impulsion method, it is infrared heat at
As method etc., since reinforced bar sleeve grouting connecting structure is complicated, above method can not effectively detect the compactness being in the milk in sleeve.
It is, in principle, that carrying out grout sleeve detection using X ray CT scanning technique has certain feasibility, but how to carry out at present
The project that actual detection operation is still urgently studied.
Summary of the invention
Reinforcing bar connection grout sleeve compactness inspection method of the purpose of the present invention for existing concrete cover
Detection accuracy and the poor technological deficiency of accuracy, it is close to provide a kind of reinforcing bar connection grout sleeve with concrete cover
Solidity detection method, the reinforcing bar connection grouting set with concrete cover that this method is obtained using X ray CT scanning technique
Cylinder faultage image, can obtain influences with the scanning compared with high-resolution, obtains the reinforced bar sleeve Grouted density of reliability
Detection data, thus to guarantee that the construction quality of reinforced bar sleeve grouting connection provides technical support.
Technical solution
In order to achieve the above technical purposes, the present invention devises a reinforcing bar connection grout sleeve with concrete cover
Compactness inspection method, it including the following steps:
The first step scans the reinforcing bar connection with concrete cover with grout sleeve under X ray CT, obtains along grouting
Sleeve central axis contains ring artifact longitudal section scan image and its Raw projection data, the ring artifact longitudal section image
Different densities substance is distinguished in the form of different gray values, middle sleeve and reinforcing bar belong to steel, and gray value is higher, interior
Portion's hole is air, and gray value is minimum and close to 0, and concrete and grouting material belong to cement-based material, and gray value is between steel
Between air；
Second step, the first step obtain containing ring artifact faultage image on the basis of, by Hough transform to ring-type
Artifact is positioned, and removes ring artifact using linear interpolation method；
Third step further adjusts steel, concrete on the basis of second step eliminates the faultage image of ring artifact
With the gray value of three kinds of substances of air, wherein any two material gray values, which differ, is not less than 60, for definitely dividing steel, mixing
Solidifying soil and three kinds of substance interfaces of air, and it is reassembled as the longitudal section scan image along grout sleeve central axis；
4th step, the grout sleeve longitudal section scan image obtained using third step, determines hole according to grey value profile
Sleeve inner area after area and removal reinforcing bar, the Grouted density of sleeve inner can be calculated according to ratio between two.
Further, it is obtained in the first step along grout sleeve central axis the step of containing ring artifact longitudal section scan image
Include:
(a) grout sleeve with concrete cover is fixed on X-ray CT equipment objective table；
(b) along being irradiated perpendicular to sleeve cross-sectional direction and CT scan, band concrete cover is obtained and along grouting
The longitudal section tomograph of sleeve central axis, image are difference close to steel, cement-based material and hole in the form of different gray values
Degree substance distinguishes.
Further, include: the step of removal ring artifact in second step
(a) using detecting straight line in Hough transform projection sinogram and artifact be accurately positioned；
(b) artifact position center of gravity in projection sinogram is carried out by interpolation using linear interpolation method, it is sinusoidal eliminates projection
Artifact in figure.
Further, third step is reassembled as grout sleeve longitudal section scan image step and includes:
(a) interface of steel, cement-based material and hole is determined；
(b) on the basis of hole, the gray value comparison of steel and cement-based material is adjusted, wherein the gray scale of cement-based material
Value should be small compared with hole gray value by 60 or more, and steel gray value answers small 60 or more cement-based material gray value, on this basis definitely
Divide three kinds of steel, concrete and air substance interfaces, and is reassembled as the longitudal section scan image along grout sleeve central axis.
Further, the step of the 4th step judges the Grouted density of sleeve inner according to grey value profile include:
(a) the grout sleeve longitudal section scan image that analytical procedure (3) obtains, obtains steel, cement-based material and hole
Distribution situation, measurement obtain sleeve inner gross area At, sleeve inner hole area AaAnd the sleeve inner area of reinforcement
As；
(b) the quantitative calculating of grout sleeve compactness ρ is carried out according to the following formula:
Beneficial effect
The reinforcing bar connection grout sleeve tomography with concrete cover that the present invention uses X ray CT scanning technique to obtain
Image is positioned by Hough transform to ring artifact first, and removes ring artifact using linear interpolation method, so
The gray value of laggard each material of a successive step, repartitions each substance interface, and is reassembled as having higher identification and reliable
The grout sleeve longitudal section scan image of degree, finally judges the Grouted density of sleeve inner according to grey value profile.This method
Can obtain influences with the scanning compared with high-resolution, obtains the detection data of the reinforced bar sleeve Grouted density of reliability, from
And to guarantee that the construction quality of reinforced bar sleeve grouting connection provides technical support.
Detailed description of the invention
Attached drawing 1 is process flow chart of the invention.
Specific embodiment
With reference to the accompanying drawings and examples, the present invention will be further described.
The reinforcing bar connection with concrete cover makes of grout sleeve test specimen first, the specific steps are as follows:
Sample dimensions are as follows: 300mm × 200mm × 430mm；Minimum thickness of concrete cover is 74mm；Sleeve uses ball
Black cast iron sleeve, length sleeve 380mm, sleeve inside/outside diameter are 42/52mm；Grouting material 28d compressive strength standard value is
85MPa；Bar diameter is 20mm in sleeve.Reinforced bar sleeve grouting connects other requirements and meets " reinforcing bar connection grout sleeve "
(JG/T398-2012), " reinforcing bar sleeve for connection grouting material " (JG/T408-2013), " reinforced bar sleeve grouting connection apply skill
Art regulation " (JGJ355-2015) requirement.
Construction requirement is consistent with scene when test specimen makes, and Grouted density is designed as 60%, conserves after specimen molding
Then 7d is tested.
Then the reinforcing bar connection grout sleeve X-ray CT scan with concrete cover is carried out:
Using 6MeV accelerator industry CT to the reinforcing bar connection with concrete cover with grout sleeve carry out along perpendicular to
The CT scan of sleeve cross-sectional direction obtains and contains ring artifact longitudal section scan image and its original along grout sleeve central axis
Beginning data for projection.Wherein 6MeV accelerator industry CT performance indicator is as follows: effective scanning bore is Φ 1000mm；Effective scanning is high
Degree is 2000mm；It is 250mmFe that ray, which penetrates maximum gauge,；Maximum workpiece weight is 2000kg；Spatial resolution is 1Lp/
mm；Having an X-rayed relative sensitivity is 1%；Density resolution is 5 ‰；Scan slice thickness is that 1-4mm is adjustable；Field trash detectability is Φ
0.5mm；Stomata detectability is Φ 3mm；Crack detection capability is 0.1mm × 15mm.
Then the reconstruction of grout sleeve longitudal section scan image and compactness inspection are carried out:
On the basis of the aforementioned obtained longitudal section scanning figure containing annular artifact data, by Hough transform to ring-type
Artifact is positioned, and removes ring artifact using linear interpolation method；Then on the basis of pore region gray value, by cement
Sill area grayscale value is adjusted to 100, steel area grayscale value and is adjusted to 200, and definitely divides each substance interface, lays equal stress on
Group is along the longitudal section scan image of grout sleeve central axis.By to above-mentioned image analysis it is found that sleeve inner gross area At
=14440mm2, the area A of sleeve inner holea=3080mm2, sleeve inner area of reinforcement As=7480mm2.Using following
Formula is calculated:
ρ=55.7% can be obtained, and practical Grouted density is 60%, the relative error of the two is only 7.1%, be can satisfy
The demand of engineering precision.
The present embodiment structure depicted in this specification institute accompanying drawings, ratio, size etc., only to cooperate specification revealed interior
Hold, so that those skilled in the art understands and reads, is not limited to the enforceable qualifications of the present embodiment, therefore does not have
Technical essential meaning, the modification of any structure, the change of proportionate relationship or the adjustment of size are not influencing institute of the present invention
Under the effect of capable of generating and the purpose that can reach, it should all still fall in disclosed technology contents and obtain the model that can cover
In enclosing.Meanwhile cited such as "upper", "lower", "left", "right", " centre ", " clockwise ", " counterclockwise " in this specification
Term, be merely convenient to being illustrated for narration, rather than to limit the scope of the invention, the change of relativeness
Or adjustment, under the content of no substantial changes in technology, when being also considered as the enforceable scope of the present invention.Above embodiments are only to say
Bright technical solution of the present invention rather than limit.Although the invention is described in detail with reference to an embodiment, this field it is common
It will be appreciated by the skilled person that modification or equivalent replacement of the technical solution of the present invention are made, without departure from the technology of the present invention side
The spirit and scope of case, are intended to be within the scope of the claims of the invention.
Claims (5)
1. the grout sleeve compactness inspection method of the reinforcing bar connection with concrete cover, which is characterized in that it includes following
Several steps:
(1) the reinforcing bar connection with concrete cover is scanned under X ray CT with grout sleeve, is obtained along grout sleeve center
Axis contains ring artifact longitudal section scan image and its Raw projection data, and the ring artifact longitudal section image is with different ashes
The form of angle value distinguishes different densities substance, and middle sleeve and reinforcing bar belong to steel, and gray value is higher, and internal void is
Air, gray value is minimum and close to 0, and concrete and grouting material belong to cement-based material, gray value between steel and air it
Between；
(2) step (1) obtain containing ring artifact faultage image on the basis of, by Hough transform to ring artifact into
Row positioning, and ring artifact is removed using linear interpolation method；
(3) on the basis of step (2) eliminates the faultage image of ring artifact, steel, concrete and air are further adjusted
The gray value of three kinds of substances, wherein any two material gray values difference be not less than 60, with for definitely divide steel, concrete and
Three kinds of substance interfaces of air, and it is reassembled as the longitudal section scan image along grout sleeve central axis；
(4) the grout sleeve longitudal section scan image obtained using step (3) is determined pore area according to grey value profile and gone
Except the sleeve inner area after reinforcing bar, the Grouted density of sleeve inner can be calculated according to ratio between two.
2. the grout sleeve compactness inspection method of the reinforcing bar connection with concrete cover as described in claim 1, special
Sign is: wrapping the step of containing ring artifact longitudal section scan image along grout sleeve central axis is obtained in the step (1)
It includes:
(a) grout sleeve with concrete cover is fixed on X-ray CT equipment objective table；
(b) along being irradiated perpendicular to sleeve cross-sectional direction and CT scan, band concrete cover is obtained and along grout sleeve
The longitudal section tomograph of central axis, image is in the form of different gray values to steel, cement-based material and hole different densities object
Matter distinguishes.
3. the grout sleeve compactness inspection method of the reinforcing bar connection with concrete cover as described in claim 1, special
Sign is: the step of removal ring artifact, includes: in the step (2)
(a) using detecting straight line in Hough transform projection sinogram and artifact be accurately positioned；
(b) artifact position center of gravity in projection sinogram is carried out by interpolation using linear interpolation method, eliminated in projection sinogram
Artifact.
4. the grout sleeve compactness inspection method of the reinforcing bar connection with concrete cover as described in claim 1, special
Sign is: the step (3) is reassembled as grout sleeve longitudal section scan image step and includes:
(a) interface of steel, cement-based material and hole is determined；
(b) on the basis of hole, the gray value comparison of steel and cement-based material is adjusted, wherein the gray value of cement-based material is answered
Small compared with hole gray value by 60 or more, steel gray value answers small 60 or more cement-based material gray value, on this basis definite segmentation
Three kinds of steel, concrete and air substance interfaces, and it is reassembled as the longitudal section scan image along grout sleeve central axis.
5. the grout sleeve compactness inspection method of the reinforcing bar connection with concrete cover as described in claim 1, special
Sign is: the step of step (4) judges the Grouted density of sleeve inner according to grey value profile includes:
(a) the grout sleeve longitudal section scan image that analytical procedure (3) obtains obtains point of steel, cement-based material and hole
Cloth situation, measurement obtain sleeve inner gross area At, sleeve inner hole area AaAnd sleeve inner area of reinforcement As；
(b) the quantitative calculating of grout sleeve compactness ρ is carried out according to the following formula:
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107202804A (en) * | 2017-05-09 | 2017-09-26 | 上海市建筑科学研究院 | Assembly concrete shear wall steel bar stress quality of connection detection method |
| CN107327158A (en) * | 2017-09-08 | 2017-11-07 | 荆门创佳机械科技有限公司 | A kind of distress in concrete slip casting method for repairing and mending |
| CN108169260B (en) * | 2017-12-28 | 2020-06-30 | 三峡大学 | Method for analyzing expansion mechanism of anchoring body with different content of expanding agent by CT scanning |
| CN108519400B (en) * | 2018-02-06 | 2022-01-18 | 温州市交通工程试验检测有限公司 | Intelligent detection method and system for grouting fullness of prestressed beam |
| CN108918660B (en) * | 2018-05-19 | 2020-12-25 | 徐光大 | Nondestructive detection method for sleeve grouting fullness of steel bar sleeve grouting connection joint |
| CN109085187A (en) * | 2018-06-14 | 2018-12-25 | 江苏方建质量鉴定检测有限公司 | With quality determining method of the X-ray detection in structural column |
| CN109238184A (en) * | 2018-09-05 | 2019-01-18 | 南京工大建设工程技术有限公司 | Semi-damage X-ray detection method for connecting joint of sleeve of assembled shear wall |
| CN109799283B (en) * | 2019-01-16 | 2019-09-03 | 昆山市建设工程质量检测中心 | A kind of method of quick judgement prefabricated concrete structure middle sleeve grouting full weight |
| CN109781752B (en) * | 2019-01-28 | 2021-07-20 | 上海市建筑科学研究院 | X-ray digital imaging enhancement and quantitative identification method for detecting grouting defect of sleeve |
| CN109931867B (en) * | 2019-04-11 | 2021-04-27 | 中民筑友科技投资有限公司 | Grouting sleeve installation quality detection method, system and device |
| CN110887843A (en) * | 2019-11-04 | 2020-03-17 | 杭州都市高速公路有限公司 | Visualization device and method for inspecting grouting compactness of sleeve of prefabricated concrete structure |
| CN111855811B (en) * | 2020-07-30 | 2023-05-12 | 贵州中建建筑科研设计院有限公司 | Grouting fullness testing method for prefabricated concrete building member sleeve |
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| JP2003149233A (en) * | 2001-11-07 | 2003-05-21 | Koji Otsuka | Method for evaluation of deterioration degree of concrete by using x-ray contrast photographing |
| CN102609980A (en) * | 2012-01-18 | 2012-07-25 | 西安建筑科技大学 | Three-dimensional reconstruction method for concrete CT (computed tomography) image |
| CN102590343B (en) * | 2012-02-23 | 2013-10-02 | 河海大学常州校区 | Device and method for ultrasonically inspecting grouting compactness of corrugated pipe duct |
| CN103389314B (en) * | 2013-07-29 | 2015-12-23 | 河海大学 | A kind of microstructure detection method of cement-based material freezing-thawing damage |
| CN105243666A (en) * | 2015-10-09 | 2016-01-13 | 南宁博创信息技术开发有限公司 | Medical MR image segmentation method based on Hough transform and geometric active contour |
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