CN105136907B - A kind of mud jacking density intelligent checking system and method based on flat survey method - Google Patents
A kind of mud jacking density intelligent checking system and method based on flat survey method Download PDFInfo
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- 238000009659 non-destructive testing Methods 0.000 abstract description 3
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Abstract
The invention discloses a kind of mud jacking density intelligent checking system and method based on flat survey method, including：The bellows duct of five compactness grades is artificially set；Empty appraising model is established, relationship when deriving back wave Mintrop wave sound and during diffracted wave Mintrop wave sound and between empty internal diameter theoretical value；Carry out the demarcation of impact echo velocity of wave；Measuring point mark is carried out along bellows direction interval setpoint distance；And the uniform coupling agent of set amount is applied at point position；On-site data gathering is carried out using flat survey method, during the back wave Mintrop wave sound obtained according to Site Detection and during diffracted wave Mintrop wave sound and foundation empty appraising model, derivation calculates empty internal diameter true value size.The present invention can carry out accurate Non-Destructive Testing to bellows hole path pressure grouting density, and detection process is easy, quick, and accuracy of detection is high, can be widely applied, can effectively control ripple pore road squeezing quality problem in work progress.
Description
Technical field
The present invention relates to the nondestructive evaluation detection technique field of mainly bellows hole path pressure grouting density, more particularly to one
Mud jacking density intelligent checking system and method for the kind based on flat survey method.
Background technology
With the development of the society, the development of science and technology, key point of the traffic as economic development, have obtained degree hair at full speed
Exhibition, highway, bridge cause also enter the high-speed developing period.China is vast in territory, and geological type is complicated and changeable, therefore inhomogeneity
The science of bridge building of type emerges in large numbers one after another, particularly causes global steel in short supply after World War II, causes prestressed structure to be widely used in
In bridge construction, in recent years, China's newly building bridge more than 95% belongs to Prestressed Concrete Bridges.And prestressing force bellows is made
For the mostly important part of prestress system, the height of its grouting quality directly affects the reliability of prestressed structure.Gold
Belonging to material under high-stress state, corrosion degree is far above unstress state, and steel strand wires can also be more easy to that corrosion occurs or even rust is disconnected,
This will have a strong impact on the normal work of prestressed structure.Now research shows that bellows hole path pressure grouting leakiness reason is that complexity is more
Sample, and hole path pressure grouting, as a kind of concealed work, construction quality is difficult effectively to be judged, how to the closely knit journey of bellows
Degree, which carries out Non-Destructive Testing, turns into the problem of puzzlement domestic and international project circle.
The a series of problems brought for bellows hole path pressure grouting density deficiency to bridge structure.Used by both at home and abroad
Detection method is：
(1) core-drilling method：Core boring sampling method is using hollow thin-wall drill bit machinery, in certain sampling observation ratio from coagulation
Core boring sampling is to detect a kind of method of defect in concrete in soil structure.This method is intuitive and reliable, but structure can be caused
Certain damage, and workload is big, efficiency is low, costly.Therefore, should not large area examined using core boring sampling method
Survey, general after being noted abnormalities with nondestructive determination, just is made further to confirm to judge using this method.
(2) wave velocity method：Wave velocity method (Impact-echo Method), i.e., using mechanical transient batting measured object surface
Measuring point produces instantaneous stress ripple, then analyzes a kind of method of the stress wave in inside configuration difference interface reflection diffraction rule.
Contain compressional wave P ripples, shear wave S ripples, the stress wave of surface wave R ripples in inside configuration propagation (wherein in body surface propagate, P by R ripples
Ripple and S ripples are propagated in interior of articles), it will be reflected when defect in concrete or interface is run into, work as back wave
When returning to body surface, displacement is just generated, this displacement is received by sensor, obtains the time-domain signal of echo, then pass through
Fast Fourier Transform (FFT) into frequency-region signal, according to the dominant frequency of frequency-region signal can judge pipeline position and its mud jacking it is closely knit
Property.
(3) GPR method：GPR method is also referred to as geological radar method, and its operation principle is to coagulation by transmitter
Soil orientation hair more than 1GHz high-frequency impulse electromagnetic wave, electromagnetic wave are anti-through the objective body of relative dielectric constant difference or interface be present
Return after penetrating and received by antenna, pass through the analysis to close echo signal, it is possible to judge the form and construction of target.
The implementation of above-mentioned detection method is confined to many-sided reason such as environmental factor, accuracy of detection, operating process, can not
It is widely applied, the domestic lossless detection method ripe there has been no any one is to bellows hole path pressure grouting density
Carry out accurate quantification assessment.
The content of the invention
The purpose of the present invention is exactly to solve the above problems, there is provided a kind of mud jacking density intelligence based on flat survey method
Detecting system and method.The system and method is mainly for the bellows duct in box girder web, T Liang Leibanchu, using flat
Survey method is detected, and not only increases engineering practicability, and can carry out accurate quantification assessment to its mud jacking density.
To achieve these goals, the present invention adopts the following technical scheme that：
A kind of mud jacking density intelligent checking system based on flat survey method, including：
The ripple pore that compactness is respectively five compactness grades of a, b, c, d, e is set respectively on concrete sample
Road；Setting position installation signal projector and signal receiver on concrete sample.
Signal projector is arranged on the same side of concrete sample, the signal in concrete slab the same side with signal receiver
Transmitter and signal receiver distributing position must along bellows opening position.
A kind of mud jacking density intelligent detecting method based on flat survey method, comprises the following steps：
(1) full-scale model test is established, it is artificial that the ripple that compactness is respectively five compactness grades of a, b, c, d, e is set
Pore road；
(2) according to two groups of data during impact echo back wave Mintrop wave sound and during diffracted wave Mintrop wave sound, cavity estimation mould is established
Type, T when deriving back wave Mintrop wave sound1With T during diffracted wave Mintrop wave sound2And empty internal diameter theoretical value RtBetween relationship；
(3) the concrete standard test block made using, the same period identical with strength of concrete specimen, impact echo velocity of wave is carried out
V demarcation；
(4) portion faces are tested in concrete sample, corresponding bellows burial place cloth dotted line, and along bellows direction
It is spaced setpoint distance and carries out measuring point mark；
(5) grinding process is carried out to operation surface and the uniform coupling agent of set amount is applied at point position；
(6) on-site data gathering is carried out using flat survey method, each measuring point gathers multiple data；
(7) estimate in during the back wave Mintrop wave sound obtained according to Site Detection the and during diffracted wave Mintrop wave sound and cavity of foundation
Model, derivation calculate empty internal diameter true value size.
The full-scale model test includes：
The ripple pore that compactness is respectively five compactness grades of a, b, c, d, e is set respectively on concrete sample
Road；Setting position installation signal projector and signal receiver on concrete sample.
Signal projector and signal receiver distributing position in concrete slab the same side must be in bellowss along line position
Place.
The empty appraising model is specially：
Signal generator R and signal receiver T is arranged on same one end of bellows, and I is signal generator R and signal receives
Device T point midway；Signal generator R launching shock echoes, launch at the position H of bellows face, are then connect by signal
Device T is received to receive；Meanwhile when passing through bellows diffraction phenomenon, impact echo and bellows upper and lower ends occur for impact echo
Contact point is respectively B, C and F, E, and M, N are respectively that circle corrugated pipe uppermost position in fig-ure point and lowermost position are put a little；By 2 points of point B, M it
Between Bellows Length be referred to as BM, the Bellows Length between 2 points of point M, C is referred to as MC；Diffracted signal and the bellows other end
Contacted in point D.
The theoretical value R of empty radius can be extrapolated by establishing empty appraising model, during according to back wave Mintrop wave soundtWith
T during diffracted wave theory Mintrop wave sound2t, T when diffracted wave surveys Mintrop wave sound is determined in measured data2, analyze diffracted wave Mintrop wave sound
When theoretical value and measured value between relation, obtain one on the check coefficient between measured value and theoretical valueI.e.According to the check coefficient and empty radius theoretical value Rt, you can extrapolate empty radius measured value R size.
Empty internal diameter theoretical value RtWith T during diffracted wave theory Mintrop wave sound2tDetermination process it is as follows：
1) tried to achieve according to known conditions：
2) using Δ TOI as research object, crucial distance and angle is carried out and is solved：
3) using Δ TBO as research object, crucial distance and angle is carried out and is solved：ByCan
Try to achieve
4) using Δ COD as research object, crucial distance and angle is carried out and is solved：
5) it can be seen from diffraction curve path analysis：
Wherein, LTHFor TH spacing；T1For back wave Mintrop wave sound when；V is spread speed of the impact echo in concrete；LTI
For TI spacing；DTRFor signal receiver T signal generator R between the two away from；LIOFor IO spacing；L is concrete slab thickness.
The beneficial effects of the invention are as follows：
The present invention can carry out accurate-Non-Destructive Testing to bellows hole path pressure grouting density, and detection process is easy, quick,
Accuracy of detection is high, can be widely applied, can effectively control ripple pore road squeezing quality problem in work progress.
The inventive method is examined mainly for the bellows duct in box girder web, T Liang Leibanchu using flat survey method
Survey, not only increase engineering practicability, and accurate quantification assessment can be carried out to its mud jacking density.
Brief description of the drawings
Fig. 1 is the test model schematic diagram of the present invention；
Fig. 2 is the empty appraising model schematic diagram of the present invention；
Fig. 3 is cosine law schematic diagram.
Wherein, 1 is bellows duct, and 2 be signal projector, and 3 be signal receiver, and 4 be concrete sample.
Embodiment：
The present invention will be further described with embodiment below in conjunction with the accompanying drawings：
The general principle that the present invention uses is impact echo principle, and for impact echo as a kind of elastic wave, it possesses sound
Whole attributes of ripple, in concrete medium communication process, shock wave can produce reflection, scattering phenomenon, therefore impact echo again
During by the cavities of different defect levels, propagation path has more obvious difference, when obtaining different sound using flat survey method
Signal, i.e.,：T during back wave Mintrop wave sound1With T during diffracted wave Mintrop wave sound2.By establishing empty appraising model, empty internal diameter is derived
Theoretical value and check COEFFICIENT K, so that it is determined that going out the true value R of empty internal diameter.
A kind of mud jacking density intelligent checking system based on flat survey method, including：
The ripple pore that compactness is respectively five compactness grades of a, b, c, d, e is set respectively on concrete sample
Road；Setting position installation signal projector and signal receiver on concrete sample.
Signal projector is arranged on the same side of concrete sample, the signal in concrete slab the same side with signal receiver
Transmitter and signal receiver distributing position must along bellows opening position.
A kind of mud jacking density intelligent detecting method based on flat survey method, comprises the following steps：
1st, establish full-scale model test, as shown in figure 1, on concrete sample 4 respectively it is artificial set it is complete closely knit, 3/4 close
Real, 1/2 closely knit, 1/4 closely knit and complete empty five grades bellows duct 1；The setting position installation letter on concrete sample 4
Number transmitter 2 and signal receiver 3.Signal projector 2 and the distributing position of signal receiver 3 in concrete slab the same side is necessary
The opening position along bellows.
2nd, empty appraising model is established, T when deriving back wave Mintrop wave sound1With T during diffracted wave Mintrop wave sound2And empty internal diameter
Theoretical value RtBetween relationship；
3rd, the concrete standard test block made using, the same period identical with concrete sample semi-finals degree, impact echo velocity of wave is carried out
V demarcation；
4th, portion faces are tested in concrete sample 4, correspond to bellows burial place cloth dotted line, and along longitudinal direction equidistantly
1cm is labeled, altogether 11 measuring points；
5th, operation surface is carried out by grinding process using sander or sand paper and is applied to a certain amount of uniform coupling agent
At point position；
6th, on-site data gathering, data are collected using flat survey method, each measuring point gathers data three times；
Flat survey method is signal projector 2 with receiver in concrete slab the same side, there is the transmission signal of signal projector 2,
Impact echo is propagated in concrete slab, by bellows duct 1, arrive at concrete slab to side, be then reflected back signal
The opening position of receiver 3, by the reception signal of signal receiver 3, propagation path is as shown in Fig. 2 sensor mounting location such as Fig. 1 institutes
Show, concrete slab the same side signal projector 2 and the distributing position of signal receiver 3 must along bellows opening position,
Its cross section is as shown in Figure 2.
With empty appraising model simultaneous during the back wave Mintrop wave sound for the 7th, obtaining Site Detection and during diffracted wave Mintrop wave sound, push away
Lead and calculate empty internal diameter true value size.
The present invention is using impact echo principle as theoretical foundation, i.e.,：T=1/f=D/V；In formula：V --- ultrasonic wave is mixed
Spread speed in solidifying soil；D --- propagation path；T --- during Mintrop wave sound；F --- the resonance of ripple is obtained by Fourier transformation
Frequency.
When deriving Mintrop wave sound by empty appraising model with empty internal diameter correlation, the present invention is using the cosine law in terms of
Calculate theoretical foundation.The cosine law is to describe the mathematical theorem of three edge lengths and a cosine of an angle value relation in triangle, in Δ
In ABC (such as Fig. 3), the cosine law is represented by：
c2=a2+b2-2ab cos(γ)
b2=c2+a2-2ac cos(β)
a2=b2+c2-2bc cos(α)
A, the corresponding line segment length in b, c representative graph 3.
The present invention considers that empty appraising model cavity internal diameter only in the case of more than TR transducer spacing, just there is class
Like reflection path, in Practical Project detection process, bellows cavity internal diameter is less than in the case of 1mm for bellows working stress shadow
Sound can be ignored, therefore situation of the empty internal diameter less than 1mm will not considered.
During Site Detection, according to two groups of data during impact echo back wave Mintrop wave sound and during diffracted wave Mintrop wave sound, build
Empty appraising model is found, so as to derive the true value size of bellow cavity internal diameter.
In the present invention, empty appraising model (such as Fig. 2) is established based on flat survey method, T when obtaining back wave Mintrop wave sound1With diffraction
T during ripple Mintrop wave sound2And empty internal diameter theoretical value RtBetween relation formula, its derivation following steps：
1) can be in the hope of according to known conditions
2) using Δ TOI as research object, crucial distance and angle is carried out and is solved：
3) using Δ TBO as research object, crucial distance and angle is carried out and is solved：ByCan
Try to achieve
4) using Δ COD as research object, crucial distance and angle is carried out and is solved：
5) it can be seen from diffraction curve path analysis：
BM MC when being solved, it is emphasized that inside diameter of bel, it is known that the circular radius namely in accompanying drawing 2
Know.Because ∠ MOD=90 °, ∠ MOC=∠ MOD- ∠ COD, ∠ BOM=180 °-∠ TOB- ∠ MOC- ∠ COD- ∠ TOI, carry out
In two arc solution procedurees, in the case of known to two angles, pass through arc length formula, BM=radiuses × ∠ BOM；MC=half
Footpath × ∠ MOC.
The theoretical value R of empty radius can be extrapolated by establishing empty appraising model, during according to back wave Mintrop wave soundtWith
T during diffracted wave theory Mintrop wave sound2t, T when diffracted wave surveys Mintrop wave sound is determined in measured data2, analyze diffracted wave Mintrop wave sound
When theoretical value and measured value between relation, obtain one on the check coefficient between measured value and theoretical valueI.e.According to the check coefficient and empty radius theoretical value Rt, you can extrapolate empty radius measured value R size.
Although above-mentioned the embodiment of the present invention is described with reference to accompanying drawing, model not is protected to the present invention
The limitation enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme those skilled in the art are not
Need to pay various modifications or deformation that creative work can make still within protection scope of the present invention.
Claims (4)
1. a kind of mud jacking density intelligent detecting method based on flat survey method, it is characterized in that, comprise the following steps：
(1) full-scale model test is established, it is artificial that the ripple pore that compactness is respectively five compactness grades of a, b, c, d, e is set
Road；
(2) according to two groups of data during impact echo back wave Mintrop wave sound and during diffracted wave Mintrop wave sound, empty appraising model is established, is pushed away
T when exporting back wave Mintrop wave sound1With T during diffracted wave Mintrop wave sound2And empty internal diameter theoretical value RtBetween relationship；
The theoretical value R of empty radius can be extrapolated by establishing empty appraising model, during according to back wave Mintrop wave soundtWith diffraction
T during ripple theory Mintrop wave sound2t, T when diffracted wave surveys Mintrop wave sound is determined in measured data2, managed when analyzing diffracted wave Mintrop wave sound
By the relation between value and measured value, one is obtained on the check coefficient between measured value and theoretical valueI.e.
According to the check coefficient and empty radius theoretical value Rt, you can extrapolate empty radius measured value R size；
Empty internal diameter theoretical value RtWith T during diffracted wave theory Mintrop wave sound2tDetermination process it is as follows：
1) tried to achieve according to known conditions：
2) using Δ TOI as research object, crucial distance and angle is carried out and is solved：
3) using Δ TBO as research object, crucial distance and angle is carried out and is solved：ByIt can try to achieve
4) using Δ COD as research object, crucial distance and angle is carried out and is solved：
5) it can be seen from diffraction curve path analysis：
Wherein, LTHFor TH spacing；T1For back wave Mintrop wave sound when；V is spread speed of the impact echo in concrete；LTIFor TI
Spacing；DTRFor signal receiver T signal generator R between the two away from；LIOFor IO spacing；L is concrete slab thickness；
(3) the concrete standard test block made using, the same period identical with strength of concrete specimen, carry out impact echo velocity of wave v's
Demarcation；
(4) portion faces are tested in concrete sample, corresponding bellows burial place cloth dotted line, and along bellows direction interval
Setpoint distance carries out measuring point mark；
(5) grinding process is carried out to operation surface and the uniform coupling agent of set amount is applied at point position；
(6) on-site data gathering is carried out using flat survey method, each measuring point gathers multiple data；
(7) during the back wave Mintrop wave sound obtained according to Site Detection and during diffracted wave Mintrop wave sound and foundation cavity estimation mould
Type, derivation calculate empty internal diameter true value size.
2. a kind of mud jacking density intelligent detecting method based on flat survey method as claimed in claim 1, it is characterized in that, it is described big
Type model test includes：
The bellows duct that compactness is respectively five compactness grades of a, b, c, d, e is set respectively on concrete sample；
Setting position installation signal projector and signal receiver on concrete sample.
3. a kind of mud jacking density intelligent detecting method based on flat survey method as claimed in claim 2, it is characterized in that, in coagulation
The signal projector of native plate the same side and signal receiver distributing position must along bellows opening position.
4. a kind of mud jacking density intelligent detecting method based on flat survey method as claimed in claim 1, it is characterized in that, the sky
Hole appraising model is specially：
Signal generator R and signal receiver T is arranged on same one end of bellows, and I is signal generator R and signal receiver T
Point midway；Signal generator R launching shock echoes, launch at the position H of bellows face, then by signal receiver
T is received；Meanwhile when passing through bellows diffraction phenomenon, impact echo contact with bellows upper and lower ends occur for impact echo
Point is respectively B, C and F, E, and M, N are respectively that circle corrugated pipe uppermost position in fig-ure point and lowermost position are put a little；By between 2 points of point B, M
Bellows Length is referred to as BM, and the Bellows Length between 2 points of point M, C is referred to as into MC；Diffracted signal is with the bellows other end in point
D is contacted.
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| CN105929108B (en) * | 2016-04-12 | 2019-01-22 | 浙江交工集团股份有限公司 | Prestress hole path pressure grouting quality determining method |
| CN106226359A (en) * | 2016-08-18 | 2016-12-14 | 长沙理工大学 | Method for monitoring grouting compactness of corrugated pipe of prestressed concrete member |
| CN107037123B (en) * | 2016-11-21 | 2019-11-05 | 上海同济建设工程质量检测站 | A kind of detection method of grouting material fullness degree |
| CN110119533A (en) * | 2019-04-10 | 2019-08-13 | 中铁十二局集团有限公司 | The calculation method of mud jacking compactness based on display dynamical modeling analysis |
| CN113295765B (en) * | 2021-05-14 | 2024-04-26 | 四川陆通检测科技有限公司 | Method for detecting grouting defects of pore canal |
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