CN108918660B - Nondestructive detection method for sleeve grouting fullness of steel bar sleeve grouting connection joint - Google Patents
Nondestructive detection method for sleeve grouting fullness of steel bar sleeve grouting connection joint Download PDFInfo
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- CN108918660B CN108918660B CN201810483938.1A CN201810483938A CN108918660B CN 108918660 B CN108918660 B CN 108918660B CN 201810483938 A CN201810483938 A CN 201810483938A CN 108918660 B CN108918660 B CN 108918660B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/02—Analysing fluids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/02—Analysing fluids
- G01N29/036—Analysing fluids by measuring frequency or resonance of acoustic waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
- G01N2291/0232—Glass, ceramics, concrete or stone
Abstract
The invention provides a nondestructive testing method for sleeve grouting fullness of a steel bar sleeve grouting connection joint, and belongs to the technical field of quality testing of fabricated concrete construction projects. According to the method, only a steel hammer is used for tapping the position right above the sleeve of the grouting sleeve connecting position and the surface of the concrete protective layer without the sleeve part (a common part), the received stress wave signal is detected, the signal amplitude before and after grouting, the amplitude attenuation condition and the frequency change are compared, whether sleeve grouting is full can be judged, and the problem of the method for detecting the connecting quality of the assembly type construction steel bar grouting sleeve is solved. The method does not need to embed a detection element in advance, realizes the detection with safety, rapidness, simplicity, convenience and low cost, and makes an exact judgment on whether the grouting is full or not.
Description
Technical Field
The invention relates to the field of assembly type construction engineering, in particular to a nondestructive testing method for sleeve grouting fullness of a steel bar sleeve grouting connection joint.
Background
At present, the development of assembly type building engineering in China is rapidly promoted, assembly type buildings are gradually increased year by year, and the proportion of the target requirement of the new building area is more than 30%. The basic requirement of the prefabricated building is that effective measures must be taken to enhance the structural integrity, wherein the sleeve grouting requirement of the steel bar grouting sleeve joint of the prefabricated concrete structure must be full. But the sleeve grouting construction requirements are fine, and the construction quality causes many questions at present. How to detect the fullness of the wine is considered as a big problem, and no effective method is available for detection and evaluation. For this reason, whether or not to develop a prefabricated building has been widely questioned at a time.
From the analysis of the current domestic and foreign documents and patent retrieval data, the grouting fullness detection method comprises the following steps: an embedded steel wire drawing method (Chinese patent publication No. CN 107478512A), an embedded sensor method (Chinese patent publication No. CN 105223344B), an X-ray method and an ultrasonic nondestructive testing method at a slurry outlet. In the former 2 methods, detection elements are required to be pre-embedded, and only the grouting quality condition near the pre-embedded part can be detected, and in addition, due to the reasons of bent pipe arrangement of a slurry outlet pipe and the like, the detection elements cannot be pre-embedded; the X-ray method has the characteristic of relatively intuitive results, but has a plurality of defects. Such as: safety issues; the thickness of the detection object component of the portable X-ray detector is not large (less than or equal to 20cm), and the thickness of the beam column component is generally more than 20 cm; when the steel bars and the sleeves are symmetrically arranged, the detection object body is shielded by the steel bars, so that the application of the X-ray method is greatly influenced, and the requirements of the building engineering are difficult to meet at present; the ultrasonic nondestructive detection method at the slurry outlet can not detect when the slurry outlet pipe is bent; the slurry outlet is required to be specially treated, and whether a cavity exists at the slurry outlet can be detected only, and the detection on whether a gap exists in the middle of the sleeve and the size of the gap can not be realized.
Therefore, it is highly desirable to develop an effective nondestructive testing method for grout fullness.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a nondestructive testing method for the sleeve grouting fullness of the steel bar sleeve grouting connection joint, which has the advantages of high testing speed, high efficiency and low cost and can accurately judge the grouting fullness.
A nondestructive testing method for the sleeve grouting fullness of a steel bar sleeve grouting connection joint comprises the following steps:
step one, wave velocity measurement: measuring the impact elastic wave velocity of the prefabricated member solid concrete to obtain the p-wave velocity C of the member solid concretep；
Step two, steel bar detection: carrying out nondestructive steel bar distribution detection on the sleeve connecting part to be detected, and marking the sleeve position and the steel bar distribution condition by combining a design drawing;
step three, impact echo detection before grouting: before grouting, impact echo detection is performed on the prefabricated member sleeve connection part to be detected, the central part without the sleeve part (general part) and the central part right above the sleeve, avoiding stirrups, and time domain waveforms are obtained respectively, so that the maximum positive value A of the amplitude of the sleeve-free part and the maximum positive value A of the amplitude of the un-grouted sleeve part are obtained respectively0(ii) a Frequency analysis is performed on the time domain waveform to obtain a frequency domain waveform, thereby obtaining a main vibration frequency value f of a sleeve-free portion (a general portion) and a main vibration frequency value f of an unfired sleeve portion0；
Step four, impact echo detection after grouting: and (3) performing grouting fullness detection on the grouted sleeve after the grout is cured to obtain the maximum positive value A of the detection amplitude of the grouted sleeve by an impact echo method1iAnd a main frequency value f1iFinding out the minimum value f1minThe corresponding position can be determined as the center position of the cavity.
Step five, frequency calculation: f. ofT＝ζCp/2T、fvoid＝ζCp/2d、fbar＝ζ'CpThe ratio of the total weight of the mixture to the total weight of the mixture is/4T; in the formula
Prominent frequency fTIs the thickness frequency; f. ofbarIs the steel bar or sleeve reflection frequency; f. ofvoidIs the cavity reflection frequency; t is the thickness of the component; d is the cavity top plate burial depth; ζ is the shape factor; ζ 'is a relative position shape coefficient, ζ' is-0.6D/t + 1.5; d/t is the ratio of the diameter of the steel bar to the thickness of the protective layer;
step six, grouting fullness determination: and comparing the frequency measured value with the frequency calculated value, analyzing the detection data, judging the reasonability of the detection data, judging whether the grouting is full or not according to the table 1.
TABLE 1
Further, the fourth step is specifically: and (3) arranging measuring points at intervals of the thickness of the concrete protective layer of the sleeve along the right upper part of the sleeve (when the embedded depth of the sleeve is larger, the measuring points can be arranged at the middle points of trisection of the length of the sleeve), avoiding the stirrups, respectively carrying out multi-point impact echo method detection, and obtaining the maximum positive value A of the detection amplitude of the sleeve after grouting by using the impact echo method of the sleeve obtained by the third step1iAnd a main frequency value f1i。
Further, the method also comprises the following steps: step seven, verifying whether the judged grouting is full: and (3) for the center position of the cavity, adopting concrete of the protective layer and a small hole on the sleeve wall, detecting the volume of the gap by using methods such as an endoscope or irrigation, and carrying out grouting filling treatment on the cavity.
Further, the detection of the void volume is performed using an endoscope or a water-filling method.
Further, ζ of the plate-shaped body is 0.96, ζ of the square column is 0.87, and ζ of the rectangular section beam column changes with a change in the aspect ratio of the section.
The invention only needs to lightly knock the concrete surface of the part right above the sleeve axis and without the sleeve part (general part) by a steel ball, receive and record the reflected elastic wave of the component interface and the hollow and solid interface, observe the change of the amplitude value, calculate the vibration frequency component by special software, and judge whether the hollow exists and the burial depth according to the reflection frequency change of the component interface and the reflection frequency of the hollow. The method has no potential safety hazard, does not need to embed a detection element, has the advantages of high detection speed, high efficiency, low cost and the like, and the grout outlet pipe of the sleeve is basically not influenced even being bent; and (4) judging the detection result, controlling and judging according to the amplitude and the attenuation change and the frequency index, and making an exact judgment on the grouting fullness.
Drawings
FIG. 1 is a schematic view illustrating a hole detection of a steel bar grouting sleeve joint;
the reference numbers in the figures are as follows: 1-grouting sleeve joint, 2-reinforcing steel bar, 3-grouting material, 4-grouting opening, 5-grout outlet, 6-sleeve and 7-cavity.
FIG. 2 is a graph of the results of a near sleeve contact surface test; the upper part is a detection schematic diagram, the middle part is a shock echo time domain waveform, and the lower part is a shock echo frequency domain waveform;
FIG. 3 is a diagram of the detection result of the contact surface of the distal sleeve, the upper part is a schematic detection diagram, the middle part is a shock echo time domain waveform, and the lower part is a shock echo frequency domain waveform.
Detailed Description
The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings.
Referring to fig. 1, which is a schematic view illustrating a hole detection of a steel bar grouting sleeve joint, an embodiment of the present invention provides a nondestructive detection method for sleeve grouting fullness of a steel bar sleeve grouting connection joint, including the following steps
Step one, wave velocity measurement: measuring the impact elastic wave velocity of the prefabricated member solid concrete to obtain the p-wave velocity C of the member solid concretep. Measuring the p-wave velocity of structural solid concrete by using a shock elastic wave detector which is qualified in calibration, arranging a measuring line at an angle of 45 degrees with longitudinal and transverse steel bars, fixing a receiving sensor, moving a knocking hammer by 10cm at each time, measuring multiple points (for example, 5-8 points) at different distances of 30cm-100cm, and calculating a formula by taking a weighted average value of the distances as a wave velocity representative value of the measuring line: cp＝∑(Li*Cpi)/∑Li，Cpi＝Li*/ΔtiIn which C ispiFor measuring the wave velocity value, CpIs a representative value of wave velocity of the survey line, i.e. p-wave velocity, L of the concrete of the structural entityiFor each measurement point, Δ tiThe propagation time of the elastic wave of each measuring point is;
step two, steel bar detection: carrying out nondestructive reinforcement detection on the sleeve 6 to be detected and the connecting part, and marking the position of the sleeve 6 and the distribution condition of the reinforcement 2 and the stirrups by combining a design drawing;
step three, impact echo detection before grouting: before grouting, the prefabricated member sleeve connection part to be detected is subjected to impact echo detection on the central part without the sleeve part (general part) and the central part right above the sleeve 6, avoiding stirrups, and respectively obtaining time domain waveforms, so that the maximum positive values of amplitude A (without the sleeve part) and amplitude A (without the sleeve part) are respectively obtained0(grouted sleeve section); frequency analysis is carried out on the time domain waveform to obtain a frequency domain waveform, so that main vibration frequency values f (without a sleeve part) and f are obtained respectively0(grouted sleeve section);
step four, impact echo detection after grouting: and (4) carrying out grouting fullness detection on the grouted sleeve 6 after the grout is solidified. The measuring points are arranged at intervals of the thickness of the concrete protective layer of the sleeve along the right upper part of the sleeve (when the buried depth of the sleeve is larger, the measuring points can be arranged at the middle points of trisection of the length of the sleeve) And (3) avoiding stirrups, respectively carrying out multipoint impact echo method detection, and obtaining the maximum positive value A of the impact echo method detection amplitude of the sleeve after grouting by using the method of the step three1iAnd a main frequency value f1iFinding out the minimum value f1minThe corresponding position can be judged as the central position of the cavity;
step five, frequency calculation: f. ofT＝ζCp/2T、fvoid＝ζCp/2d、fbar＝ζ'CpThe ratio of the total weight of the mixture to the total weight of the mixture is/4T; in the formula:
prominent frequency fTIs the thickness frequency; f. ofbarIs the steel bar or sleeve reflection frequency; f. ofvoidIs the cavity reflection frequency; t is the thickness of the component; d is the cavity top plate burial depth; ζ is a shape factor (ζ of a plate-shaped body is 0.96, ζ of a square column is 0.87, and ζ of a rectangular section beam column changes with a change in a section aspect ratio); and the relative position shape coefficient of zeta' is-0.6D/t +1.5, and D/t is the ratio of the diameter of the reinforcing steel bar to the thickness of the protective layer. These calculations are important for the analysis of the measured spectrum.
Step six, grouting fullness determination: comparing the measured frequency value with the calculated frequency value, analyzing the detection data, judging the reasonability of the detection data, judging whether the grouting is full according to the table 1, and showing the result in the table 2.
TABLE 2
Step seven, verification: if deemed necessary, verification may be made as to whether the judged grout is full. And (3) for the center position of the cavity, adopting concrete of the protective layer and a small hole on the sleeve wall, detecting the volume of the gap by using methods such as an endoscope or irrigation, and carrying out grouting filling treatment on the cavity.
For the assembly type construction engineering, when the prefabricated components of the shear wall are connected by adopting a semi-grouting sleeve, or when the prefabricated column or the prefabricated beam component are connected by adopting a full-grouting sleeve, or for the assembly type underground pipe gallery construction engineering, when the prefabricated components are connected by adopting the grouting sleeve, the nondestructive detection method for the grouting fullness of the sleeve can be adopted.
Compared with the prior art, the invention has the following beneficial effects:
the invention only needs to lightly knock the concrete surface of the part right above the sleeve axis and without the sleeve part (general part) by a steel ball, receive and record the reflected elastic wave of the component interface and the hollow and solid interface, observe the change of the amplitude value, calculate the vibration frequency component by special software, and judge whether the hollow exists or not and the burial depth according to the reflection frequency change of the component interface and the reflection frequency of the hollow. The method has no potential safety hazard, does not need to embed a detection element, has the advantages of high detection speed, high efficiency, low cost and the like, and the grout outlet pipe of the sleeve is basically not influenced even being bent; and (4) judging the detection result, controlling and judging according to the amplitude and the attenuation change and the frequency index, and making an exact judgment on the grouting fullness.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (4)
1. A nondestructive detection method for the sleeve grouting fullness of a steel bar sleeve grouting connection joint is characterized by comprising the following steps:
step one, wave velocity measurement: measuring the impact elastic wave velocity of the prefabricated member solid concrete to obtain the p-wave velocity C of the member solid concretep；
Step two, steel bar detection: carrying out nondestructive steel bar distribution detection on the sleeve connecting part to be detected, and marking the sleeve position and the steel bar distribution condition by combining a design drawing;
third, impact back before groutingWave detection: before grouting, impact echo detection is carried out on the sleeve connecting part of the prefabricated part to be detected, the central part without the sleeve part and the central part right above the sleeve, the stirrups are avoided, time domain waveforms are obtained respectively, and the maximum positive value A of the amplitude of the sleeve part without the sleeve part and the maximum positive value A of the amplitude of the sleeve part without grouting are obtained respectively0(ii) a Frequency analysis is carried out on the time domain waveform to obtain a frequency domain waveform, so that a main vibration frequency value f of a non-sleeve part and a main vibration frequency value f of an un-grouted sleeve part are respectively obtained0；
Step four, impact echo detection after grouting: and (3) performing grouting fullness detection on the grouted sleeve after the grout is cured to obtain the maximum positive value A of the detection amplitude of the grouted sleeve by an impact echo method1iAnd a main frequency value f1iFinding out the minimum value f1minThe corresponding position can be judged as the central position of the cavity;
step five, frequency calculation: f. ofT＝ζCp/2T、fvoid＝ζCp/2d；
In the formula
Prominent frequency fTIs the thickness frequency; f. ofvoidIs the cavity reflection frequency; t is the thickness of the component; d is the cavity top plate burial depth; ζ is the shape factor;
step six, grouting fullness determination: comparing the frequency measured value with the frequency calculated value, analyzing the detection data, judging the reasonability of the detection data, judging whether grouting is full according to the following table:
the fourth step is specifically as follows: and (3) respectively carrying out multipoint impact echo method detection along the right upper part of the sleeve at intervals of the thickness of the concrete protective layer of the sleeve and avoiding stirrups, and obtaining the maximum positive value A of the detection amplitude of the sleeve after grouting by using the impact echo method in the third step1iAnd a main frequency value f1i。
2. The nondestructive testing method for the grouting fullness of a sleeve of a steel bar sleeve grouting joint according to claim 1, characterized in that: further comprising: step seven, verifying whether the judged grouting is full: and (4) forming small holes in the center of the cavity by adopting the concrete of the protective layer and the sleeve wall, detecting the volume of the gap, and grouting and filling the cavity.
3. The nondestructive testing method for the grouting fullness of a sleeve of a steel bar sleeve grouting joint according to claim 2, characterized in that: the detection of the void volume is carried out using an endoscope or irrigation method.
4. The nondestructive testing method for the grouting fullness of a sleeve of a steel bar sleeve grouting joint according to claim 1, characterized in that: zeta of the plate-shaped body is 0.96, zeta of the square column is 0.87, and zeta of the rectangular section beam column changes with the change of the section aspect ratio.
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