CN108918660A - The lossless detection method of the sleeve grouting plumpness of reinforced bar sleeve grouting jointing - Google Patents
The lossless detection method of the sleeve grouting plumpness of reinforced bar sleeve grouting jointing Download PDFInfo
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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
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Abstract
The present invention provides a kind of lossless detection method of the sleeve grouting plumpness of reinforced bar sleeve grouting jointing, belongs to assembly concrete project delivery method detection technique field.The method only needs position and the concrete protective layer surface without sleeve part (general portion) right above the sleeve with steel hand hammer tap grout sleeve connecting portion; detect the stress wave signal received; the signal amplitude and amplitude attenuation of comparison grouting front and back and frequency variation; can determine that whether sleeve grouting is full, the method for solving the problems, such as the detection of assembled architecture reinforcing bar grout sleeve quality of connection.Whether the method does not need pre-buried detecting element, realizes safe, quick, simple and easy to do and inexpensive detection, full to grouting to make definite judgement.
Description
Technical field
The present invention relates to assembled construction project field, the sleeve grouting of specifically a kind of reinforced bar sleeve grouting jointing
The lossless detection method of plumpness.
Background technique
Currently, China's assembled architecture engineering development is quickly propelled, assembled architecture cumulative year after year, target call is accounted for
The ratio of new building area reaches 30% or more.The basic demand of assembled architecture, which must exactly adopt an effective measure, reinforces knot
The globality of structure, wherein the sleeve grouting of the reinforcing bar grout sleeve jointing of prefabricated concrete structure requires necessary full.
But sleeve grouting construction requires finer, many queries of construction quality initiation at present.How its plumpness is detected, it is believed that is
A great problem carries out detecting appraisal without effective method.Just as this reason, to whether developing assembled architecture,
Once once queried extensively.
It is analyzed from document and patent retrieval data both domestic and external at present, there are as below methods for the detection of grouting plumpness：Pre-buried steel
Silk hubbing【China Patent Publication No. CN107478512A】, pre-buried sensor method【Chinese patent notification number
CN105223344B】, x-ray method, Ultrasonic Nondestructive method at grout outlet.2 kinds of front method requires pre-buried detection member
Part, and the grouting quality situation of pre-buried near sites can only be detected, in addition, existing due to grout outlet bending stringing etc.
Can not pre-buried detecting element the case where；For x-ray method, have the characteristics that result is more intuitive, but there is also many deficiencies.
Such as：Safety issue；Portable X-ray detector test subject parts thickness requirement less (is less than or equal to 20cm), and beam
Column member is typically greater than the thickness of 20cm；When to having reinforcing bar and sleeve to be arranged symmetrically, test object body is by face reinforcing bar
Masking etc., therefore, the application of x-ray method are also greatly affected, and are yet difficult to meet the needs of architectural engineering at present；Surpass at grout outlet
Sound wave lossless detection method can not detect when grout outlet is bent；It is required that grout outlet is especially handled, and can only detect
It is also helpless to sleeve middle part with the presence or absence of gap and detection pore size to grout outlet position with the presence or absence of cavity.
Therefore, a kind of lossless detection method of effective detection grouting plumpness is developed, it is highly desirable.
Summary of the invention
In view of the above shortcomings of the prior art, goal of the invention of the invention is to provide that a kind of detection speed is fast, efficiency
Sleeve grouting plumpness high, at low cost, that the reinforced bar sleeve grouting jointing definitely determined can be made to grouting plumpness
Lossless detection method.
A kind of lossless detection method of the sleeve grouting plumpness of reinforced bar sleeve grouting jointing, includes the following steps：
Step 1: wave velocity measurement：The measurement of impact elasticity wave velocity is carried out to prefabricated components solid concrete, obtains component reality
Body concrete p wave wave velocity Cp；
Step 2: reinforcing bar detects：Lossless reinforcing bar distribution detection is carried out to the sleeve connection position of quasi- detection, and combines design
Drawing marks sleeve portion and reinforcing bar distribution situation；
Step 3: impacting echo detecting before grouting：Before grouting, to the prefabricated components sleeve connection position of quasi- detection, to nothing
Central part right above sleeve part (general portion) central part and sleeve avoids stirrup, carries out impact echo detection, respectively
To time domain waveform, to respectively obtain the amplitude positive peak A of the amplitude positive peak A of no sleeve part, non-grout sleeve portion0；
Frequency resolution is carried out to time domain waveform and obtains frequency-domain waveform, to respectively obtain the principal oscillation frequency values in no sleeve part (general portion)
F, the principal oscillation frequency values f in non-grout sleeve portion0；
Step 4: impacting echo detecting after grouting：To the sleeve after grouting, after grout curing, grouting plumpness is carried out
Detection obtains the Impact echo detected amplitude positive peak A of grouting after sleeve1iWith basic frequency value f1i, find out minimum therein
Value f1min, corresponding position can determine whether for cavity center.
Step 5: frequency calculates：fT=ζ Cp/2T、fvoid=ζ Cp/2d、fbar=ζ ' Cp/4T；In formula
Excellent frequency fTFor thickness frequency；fbarFor reinforcing bar or sleeve reflection frequency；fvoidFor empty reflection frequency；T is structure
Part thickness；D is empty top plate buried depth；ζ is form factor；ζ ' is relative position form factor, ζ '=﹣ 0.6D/t+1.5；D/t is
Bar diameter and protective layer thickness ratio；
Step 6: grouting plumpness determines：Comparison frequency measured value and frequency calculated value, analyze detection data,
Judge the reasonability of detection data, and whether full to being in the milk, is determined by table 1.
Table 1
Further, step 4 is specially：(work as sleeve by about sleeve thickness of concrete cover interval right above sleeve
When buried depth is larger, measuring point can arrange 3 measuring points by the intermediate point of length sleeve trisection), stirrup is avoided, carries out multiple spot impact respectively
Echo method detection obtains the Impact echo detected amplitude positive peak A of grouting after sleeve with the method for step 31iAnd basic frequency
Value f1i。
Further, further include：It is verified Step 7: whether full to the grouting of judgement：To hollow center position, adopt
Aperture is opened with cover concrete and sleeve wall, with introscope or the methods of is poured water, detects voidage, and fill to cavity
Starch filling treatment.
Further, it detects voidage introscope or irrigation method carries out.
Further, plate body ζ=0.96, square body ζ=0.87, the ζ of rectangular cross-sectional beam-column is with section depth-width ratio
Change and changes.
The present invention need to only be used by position right above sleeve axis and the concrete surface without sleeve part (general portion)
Steel ball gently taps, and receives and record the reflection elastic wave for saving component interface and cavity and solid interface, and observation amplitude becomes
Change, and calculate vibration frequency ingredient with specific software, according to the variation of component interface reflection frequency and empty reflection frequency, can sentence
Determining cavity whether there is and buried depth.The method of the invention does not have security risk, does not need pre-buried detecting element, sleeve grout outlet
Even if bending be substantially unaffected, detection speed it is fast, it is high-efficient, it is at low cost the advantages that；Testing result determines, by amplitude and declines
Subtract variation and Frequency Index control determines, definite judgement can be made to grouting plumpness.
Detailed description of the invention
Fig. 1 is reinforcing bar grout sleeve connector cavity detection schematic diagram；
Appended drawing reference is as follows in figure：1-grout sleeve connector, 2-reinforcing bars, 3-grouting materials, 4-grouting ports, 5-pulps
Mouthful, 6-sleeves, 7-cavities.
Fig. 2 is nearly barrel contacts face testing result figure；Top is detection schematic diagram, and middle part is impact echo time domain waveform,
Lower part is impact echo frequency-domain waveform；
Fig. 3 is remote barrel contacts face testing result figure, and top is detection schematic diagram, and middle part is impact echo time domain waveform,
Lower part is impact echo frequency-domain waveform.
Specific embodiment
Below in conjunction with the attached drawing in the present invention, the technical solution in the present invention is clearly and completely described.
Referring to Fig. 1, it is reinforcing bar grout sleeve connector cavity detection schematic diagram, the embodiment of the present invention provides a kind of reinforcing bar
The lossless detection method of the sleeve grouting plumpness of sleeve grouting jointing, includes the following steps
Step 1: wave velocity measurement：The measurement of impact elasticity wave velocity is carried out to prefabricated components solid concrete, obtains component reality
Body concrete p wave wave velocity Cp.With the qualified impact elasticity wave detector of calibration, p wave velocity is surveyed to structural mass concrete, by with
Reinforcing bar angle at 45 ° arranges that survey line, fixed reception sensor tap hammer by 10cm movement is increased every time, to different distance in length and breadth
30cm-100cm carries out multiple spot (such as 5-8 point) measurement, and the velocity of wave typical value by distance weighted average value as the survey line calculates
Formula：Cp=∑ (Li*Cpi)/∑Li, Cpi=Li*/Δti, wherein CpiFor measuring point value of wave speed, CpFor the velocity of wave typical value of survey line,
That is structural mass concrete p wave velocity of wave, LiFor the elastic wave propagation distance of each measuring point, Δ tiIt is passed for the elastic wave of each measuring point
Between sowing time；
Step 2: reinforcing bar detects：Lossless reinforcing bar detection is carried out to the sleeve 6 and connecting portion of quasi- detection, and combines design
Drawing marks 6 position of sleeve and reinforcing bar 2 and stirrup distribution situation；
Step 3: impacting echo detecting before grouting：Before grouting, intend the prefabricated components sleeve connection position of detection, to no set
6 surface central part of canister portion (general portion) central part and sleeve avoids stirrup, carries out impact echo detection, respectively
To time domain waveform, to respectively obtain amplitude positive peak A (no sleeve part), A0(non-grout sleeve portion)；To time domain waveform into
Line frequency parses to obtain frequency-domain waveform, to respectively obtain principal oscillation frequency values f (no sleeve part), f0(non-grout sleeve portion)；
Step 4: impacting echo detecting after grouting：To the sleeve 6 after grouting, after grout curing, grouting plumpness is carried out
Detection.By about sleeve thickness of concrete cover interval, (when sleeve buried depth is larger, measuring point can be by set tube length right above sleeve
The intermediate point for spending trisection arranges 3 measuring points), stirrup is avoided, the detection of multiple spot Impact echo is carried out respectively, with the side of step 3
Method is similarly obtained the Impact echo detected amplitude positive peak A of grouting after sleeve1iWith basic frequency value f1i, find out it is therein most
Small value f1min, corresponding position can determine whether for cavity center；
Step 5: frequency calculates：fT=ζ Cp/2T、fvoid=ζ Cp/2d、fbar=ζ ' Cp/4T；In formula：
Excellent frequency fTFor thickness frequency；fbarFor reinforcing bar or sleeve reflection frequency；fvoidFor empty reflection frequency；T is structure
Part thickness；D is empty top plate buried depth；ζ is form factor (plate body ζ=0.96, square body ζ=0.87, rectangular cross-sectional beam column
The ζ of body changes with section depth-width ratio and is changed)；The relative position ζ ' form factor, ζ '=﹣ 0.6D/t+1.5, D/t is bar diameter
With protective layer thickness ratio.These calculated values are extremely important to actual measurement spectrum analysis.
Step 6: grouting plumpness determines：Comparison frequency measured value and frequency calculated value, analyze detection data,
Judge the reasonability of detection data, and whether full to being in the milk, is determined by table 1, the result is shown in tables 2.
Table 2
Step 7: verifying：Think when necessary, whether full to the grouting of judgement can verify.To hollow center position,
Aperture is opened using cover concrete and sleeve wall, with introscope or the methods of is poured water, detects voidage, and carry out to cavity
Grouting filling treatment.
To assembled architecture engineering, when shear wall prefabricated components are connected using half grout sleeve or when prefabricated post or in advance
When beam processed is connected using full grout sleeve or to assembled underground pipe gallery construction project, when prefabricated components are using grouting set
When cylinder connection, the lossless detection method of sleeve grouting plumpness of the present invention can be used.
Compared with prior art, the invention has the advantages that：
The present invention need to only be used by position right above sleeve axis and the concrete surface without sleeve part (general portion)
Steel ball gently taps, and receives and the reflection elastic wave at recording member interface and cavity and solid interface, observation amplitude change, and
Vibration frequency ingredient is calculated with specific software, according to the variation of component interface reflection frequency and empty reflection frequency, that is, can determine that sky
Hole whether there is and buried depth.The method of the invention does not have security risk, does not need pre-buried detecting element, even if sleeve grout outlet
The advantages that bending is also substantially unaffected, and detection speed is fast, high-efficient, at low cost；Testing result determines, becomes by amplitude and decaying
Change and determine with Frequency Index control, definite judgement can be made to grouting plumpness.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Belong to those skilled in the art in the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of, all answers
It is included within the scope of the present invention.Therefore, protection scope of the present invention should be subject to the protection scope in claims.
Claims (5)
1. a kind of lossless detection method of the sleeve grouting plumpness of reinforced bar sleeve grouting jointing, it is characterised in that including such as
Lower step：
Step 1: wave velocity measurement：The measurement of impact elasticity wave velocity is carried out to prefabricated components solid concrete, it is mixed to obtain component entity
Solidifying soil p wave wave velocity Cp；
Step 2: reinforcing bar detects：Lossless reinforcing bar distribution detection is carried out to the sleeve connection position of quasi- detection, and combines design drawing
Paper marks sleeve portion and reinforcing bar distribution situation；
Step 3: impacting echo detecting before grouting：Before grouting, to the prefabricated components sleeve connection position of quasi- detection, to no sleeve
Central part right above portion's central part and sleeve avoids stirrup, carries out impact echo detection, respectively obtains time domain waveform,
To respectively obtain the amplitude positive peak A of no sleeve part, the amplitude positive peak A in non-grout sleeve portion0；To time domain waveform into
Line frequency parses to obtain frequency-domain waveform, to respectively obtain the main vibration of the principal oscillation frequency values f, non-grout sleeve portion of no sleeve part
Dynamic frequency value f0；
Step 4: impacting echo detecting after grouting：To the sleeve after grouting, after grout curing, grouting plumpness detection is carried out,
Obtain the Impact echo detected amplitude positive peak A of grouting after sleeve1iWith basic frequency value f1i, find out minimum value therein
f1min, corresponding position can determine whether for cavity center；
Step 5: frequency calculates：fT=ζ Cp/2T、fvoid=ζ Cp/2d；
In formula
Excellent frequency fTFor thickness frequency；fvoidFor empty reflection frequency；T is component thickness；D is empty top plate buried depth；ζ is shape
Shape coefficient；
Step 6: grouting plumpness determines：Comparison frequency measured value and frequency calculated value, analyze detection data, judge
The reasonability of detection data, and it is whether full to being in the milk, and according to the form below is determined：
2. the lossless detection method of the sleeve grouting plumpness of reinforced bar sleeve grouting jointing as described in claim 1,
It is characterized in that：Step 4 is specially：By about sleeve thickness of concrete cover interval right above sleeve, stirrup is avoided, respectively
The detection of multiple spot Impact echo is carried out, is obtaining the Impact echo detected amplitude maximum of grouting after sleeve just with the method for step 3
Value A1iWith basic frequency value f1i。
3. the lossless detection method of the sleeve grouting plumpness of reinforced bar sleeve grouting jointing as described in claim 1,
It is characterized in that：Further include：It is verified Step 7: whether full to the grouting of judgement：To hollow center position, using protective layer
Concrete and sleeve wall open aperture, detect voidage, and carry out grouting filling treatment to cavity.
4. the lossless detection method of the sleeve grouting plumpness of reinforced bar sleeve grouting jointing as claimed in claim 3,
It is characterized in that：Detection voidage introscope or irrigation method carry out.
5. the lossless detection method of the sleeve grouting plumpness of reinforced bar sleeve grouting jointing as described in claim 1,
It is characterized in that：The ζ of plate body ζ=0.96, square body ζ=0.87, rectangular cross-sectional beam-column changes with section depth-width ratio and is become
Change.
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| CN109406340A (en) * | 2018-12-25 | 2019-03-01 | 浙江大学 | Hammer the device and method of prepressing type test cartridge connection structure compactness of grouting |
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| CN111272867B (en) * | 2019-12-25 | 2021-01-26 | 浙江大学 | Method for detecting compactness of grouting body in steel bar sleeve connecting structure |
| CN111489633A (en) * | 2020-05-06 | 2020-08-04 | 北方工业大学 | Assembly type building node grouting quality monitoring method based on BIM |
| CN111982678A (en) * | 2020-08-04 | 2020-11-24 | 中南建筑设计院股份有限公司 | Grouting sleeve connection quality detection method |
| CN112014548A (en) * | 2020-08-04 | 2020-12-01 | 上海建工集团股份有限公司 | Slurry filling fullness detection device and method in mechanical sleeve grouting construction stage |
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| CN113504135A (en) * | 2021-06-24 | 2021-10-15 | 昆山市建设工程质量检测中心 | Method for judging whether grouting material in grouting hole of sleeve slips or not under impact |
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