CN107741381A - Apparatus and method for detecting slurry anchor overlap joint connecting node Grouted density - Google Patents
Apparatus and method for detecting slurry anchor overlap joint connecting node Grouted density Download PDFInfo
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- CN107741381A CN107741381A CN201710894796.3A CN201710894796A CN107741381A CN 107741381 A CN107741381 A CN 107741381A CN 201710894796 A CN201710894796 A CN 201710894796A CN 107741381 A CN107741381 A CN 107741381A
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- 238000000034 method Methods 0.000 title claims abstract description 43
- 239000002002 slurry Substances 0.000 title claims abstract description 27
- 239000002184 metal Substances 0.000 claims abstract description 83
- 229910052751 metal Inorganic materials 0.000 claims abstract description 83
- 238000001514 detection method Methods 0.000 claims abstract description 37
- 239000004567 concrete Substances 0.000 claims abstract description 31
- 241001212149 Cathetus Species 0.000 claims abstract description 10
- 239000011358 absorbing material Substances 0.000 claims abstract description 10
- 238000009955 starching Methods 0.000 claims abstract description 4
- 230000007547 defect Effects 0.000 claims description 25
- 239000000463 material Substances 0.000 claims description 17
- 239000000843 powder Substances 0.000 claims description 3
- 238000010008 shearing Methods 0.000 claims description 2
- 238000007569 slipcasting Methods 0.000 description 18
- 238000012360 testing method Methods 0.000 description 13
- 238000010276 construction Methods 0.000 description 11
- 235000013336 milk Nutrition 0.000 description 11
- 239000008267 milk Substances 0.000 description 11
- 210000004080 milk Anatomy 0.000 description 11
- 238000005516 engineering process Methods 0.000 description 8
- 230000002787 reinforcement Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 229920002472 Starch Polymers 0.000 description 5
- 235000019698 starch Nutrition 0.000 description 5
- 238000005086 pumping Methods 0.000 description 4
- 238000012372 quality testing Methods 0.000 description 4
- 239000008107 starch Substances 0.000 description 4
- 230000005284 excitation Effects 0.000 description 3
- 239000010931 gold Substances 0.000 description 3
- 229910052737 gold Inorganic materials 0.000 description 3
- 239000011241 protective layer Substances 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- 241000196324 Embryophyta Species 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000004069 differentiation Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000011440 grout Substances 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 210000003205 muscle Anatomy 0.000 description 2
- 238000009659 non-destructive testing Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 206010061245 Internal injury Diseases 0.000 description 1
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000034303 cell budding Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002592 echocardiography Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000002262 irrigation Effects 0.000 description 1
- 238000003973 irrigation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011178 precast concrete Substances 0.000 description 1
- 239000011513 prestressed concrete Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000004451 qualitative analysis Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000003325 tomography Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
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- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The present invention discloses a kind of apparatus and method for being used to detect slurry anchor overlap joint connecting node Grouted density, and described device includes auxiliary receiving-transmitting device, impact echo instrument and computer.Aid in receiving-transmitting device to include two sides of auxiliary receiving-transmitting device body and absorbing material, the auxiliary receiving-transmitting device or so and be bonded with absorbing material, drawn on the symmetrical shaft position in remaining four face have closure to cathetus.It is during detection that the removing surface of detected wall metal bellows vertical projection scope is clean, find the metal bellows center line of precast wall body；The binding face for aiding in receiving-transmitting device is tightly bonded with surface of wall, makes the vertical line close alignment drawn to cathetus and surface of wall on auxiliary receiving-transmitting device surface；Then wall grouting compactness is detected with impact echo instrument, finally judges Grouted density on computers.It can realize that the Grouted density that connecting node metal bellows is overlapped to starching anchor in assembly concrete shear wall structure is reliably detected by said apparatus and method.
Description
Technical field
The invention belongs to prefabricated concrete structure technical field of nondestructive testing, and in particular to one kind is used to detect assembled
The cannot-harm-detection device and method of anchor overlap joint connecting node Grouted density are starched in concrete shear wall structure.
Background technology
The demand for development of the new urbanization in China and the reality of labor shortage are currently based on, promotes building industrialization to carve
Do not allow to delay！And it is to realize the important channel of building industrialization to develop prefabricated concrete structure technology.In assembly concrete knot
Shear wall structure, frame structure are most important two kinds of construction styles, the wherein ratio shared by assembly of shear wall structure in structure
It is bigger, it is the primary structure form of current China cities and towns commercial residential building.Well known, it is vertical in assembly concrete shear wall structure
The principal mode that component connection uses has the connection of slurry anchor overlap joint, grout sleeve connection etc., assembly of shear wall structure quality control
Difficult point and core be connecting node Grouted density problem.By peopleware is uneven, grouting machine in practice of construction
The influence for many factors such as failure, Grouting plan be unreasonable, the grouting quality at node is often difficult to control, so as to cause to be in the milk
Compactness also is difficult to ensure, this directly affects the quality safety of integrated engineering.So the detection to Grouted density turns into dress
The emphasis and core checked and accepted with the quality testing of formula Shear Wall Structure Construction；It is and how close to the grouting in assembly of shear wall structure
Solidity carries out effective detection, it has also become a difficult problem of pendulum urgent need to resolve in face of construction engineering quality testing staff.Because of assembling
Formula shear wall structure is a Newly Sprouted Things, there is no more reliable, ripe complete detection technique at present.
Well known, the principle of Impact echo is to produce low frequency using a mechanical shock in short-term (see 1~Fig. 2 of accompanying drawing)
Stress wave, stress wave roundtrip between component surface, internal flaw surface or component surface bottom boundary, so as to produce
Transient state resonates, and its resonant frequency can recognize in amplitude spectrum, and with this determination structure or the depth and structure of component inside defect
The thickness of part.Impact elasticity ripple travels to inside configuration, is returned by blemish surface or component bottom reflection.Therefore, impact elasticity
Ripple roundtrip between component surface, internal flaw surface or bottom surface border produces transient state resonance, and its resonant frequency can shake
Width spectrum (by FFT, the frequency and the graph of a relation of corresponding amplitude drawn from waveform.) in identify, for true
Determine the depth of internal flaw and the thickness of component.The method have do not influenceed by metal pipe line, test scope is big, the external world is grasped
Make the advantages that environmental requirement is relatively low.In view of many merits of Impact echo, China scientific research personnel largely grinds both at home and abroad in summary
On the basis of studying carefully achievement, the industry standard of China's architectural engineering detection industry has been worked out ---《Impact echo detects concrete
Defect technical regulation》JGJ/T411-2017, the standard will be in formally implementing from 1 day November in 2017 in China.The standard handle
Application of the Impact echo in building structure quality testing field is sorted out, i.e., Impact echo is mainly used in following four
The detection of aspect：1. concrete component thickness and Inner Defect Testing；2. prestress pipe slip casting defects detection；3. tunnel-liner
Back-grouting defects detection；4. concrete joint surface quality testing.Wherein " 2. prestress pipe slip casting defects detection " and assembling
" detection of slurry anchor overlap joint connecting node Grouted density " in formula shear wall structure seems identical, actually far from each other！It is different
Part is mainly reflected in：
On the one hand above-mentioned specification assembled architecture in compilation process China is still in the budding stage, is connected using new reinforcing steel bar
The assembled architecture for connecing form (to starch anchor overlapping technology, based on grout sleeve interconnection technique) does not almost have, therefore specification establishment group
Application of the Impact echo detection technique in fabricated construction is not considered, and the objective subject that specification is directed to is cast-in-place concrete knot
Structure is built；The technical principle of another aspect Impact echo determines that it is not directly applicable the nothing of assembly of shear wall structure
In damage detection.Main cause is described as follows：
The principle of Impact echo detection pumping of prostressed duct quality is obtained using stress wave under different grouting operating modes
The frequency gone out-signal amplitude curve difference judges to the plumpness of grouting.Specifically as shown in figure 3, Fig. 3 can be divided into four
Kind situation：
1. without prestress pipe in concrete, signal amplitude-frequency curve now only has a peak point, corresponding maximum
Peak value is f；2. having prestress pipe in concrete and duct grouting being closely knit, signal amplitude-frequency curve now only has one
Peak point, corresponding peak-peak is also f；3. there are prestress pipe but duct grouting leakiness in concrete, now prestressed pipe
The protective layer thickness in road is dd, signal amplitude-frequency curve at this moment has two peak points, and corresponding peak-peak is respectively f, fd；
4. there is prestress pipe in concrete, but it is not in the milk in pipeline, signal amplitude-frequency curve at this moment there are two peak points, right
It is respectively f, f to answer peak-peakv, after frequency-signal amplitude figure of bridge prestress pipeline to be detected is obtained, pass through experience
Compare, can qualitative analysis go out the compactness of grouting of prestress pipe, said process is Impact echo detection prestressed pipe
The General Principle of road squeezing quality.
It is worth noting that：In above-mentioned detection process, when the protective layer thickness of prestress pipe is smaller, then testing result
It is very undesirable, almost without reference to value；It is additionally carried out requiring that the diameter of prestress pipe can not be too small during above-mentioned detection.
In general, the internal diameter for the bellows for being used to form prestress pipe in bridge structure is generally 60mm~132mm (see Chinese rule
Model《Metal bellows for prestressed concrete》JG225-2007), it is relatively large in diameter, the horizontal stroke of the prestressed girder in general bridge structure
Section horizontal direction only sets row's prestress pipe；Other prestress pipe is along prestressed girder span direction substantially in level
Shape；Thickness of concrete cover outside prestress pipe is generally higher than equal to 100mm.The above-mentioned spy of prestressed girder in bridge structure
Point determines can obtain good result when carrying out slip casting defects detection to prestress pipe therein using Impact echo.
Using the points for attention of Impact echo detection concrete defect, China's specification《Impact echo detects concrete
Defect technical regulation》JGJ/T411-2017 also explicitly points out that " Impact echo does not apply in interpretation of section illustrates 6.1.4 bars
Carried out under the conditions of buried depth of pipeline is excessively shallow or too deep ", this is based on when buried depth of pipeline is excessively shallow, signal amplitude-frequency curve in Fig. 3
In, reflection, which is received, when stress wave meets defect corresponds to peak-peak fd(fv) smaller, it is difficult almost to judge, therefore typically can not
For judging defect situation of being in the milk.In assembly concrete shear wall structure, as shown in 4A ' in Fig. 4, the thickness of shear wall body
Degree is typically only 150mm~200mm, and double arrangement of reinforcement before and after wall, the metal bellows in shear wall for be vertically arranged and
Away from smaller, the internal diameter of metal bellows is generally 30mm~40mm, and diameter is smaller, while the concrete protective outside metal bellows
Thickness degree is typically only 10mm or so, 1/10 or so of prestressed girder metal bellows protective layer thickness about in bridge structure,
After reinforcing bar is inserted in metal bellows and then irrigates grouting material, the cavity of grouting material formation, bubble etc. inside metal bellows
Size it is smaller, i.e. the slip casting defect of grouting material is smaller.Above-mentioned factor causes directly to cut assembled using Impact echo
When Grouted density in power wall construction carries out Non-Destructive Testing, its testing result discreteness is larger, reliability substantially reduces.It is based on
This, detection field technical staff does not typically use Impact echo to examine the Grouted density in assembly of shear wall structure
Survey, but transfer to use other technologies means, such as supercritical ultrasonics technology, GPR method, ray method etc., but testing result is still not to the utmost
Such as people's will.As fully visible, the correlation detection technology of Grouted density in assembly of shear wall structure is still in both at home and abroad at present
Exploratory stage, the temporarily complete set technology without mature and reliable.
Chinese patent CN 103499643B disclose a kind of quantitative testing device of pumping of prostressed duct plumpness situation
And method, this method include impacting in positioning deformed bar, arrangement prestress pipeline survey line and measuring point, measure concrete component
Echo bottoms out the average reflection time, measurement prestress pipe impact echo is bottomed out reflection interval and satisfied using pumping of prostressed duct
Full scale computation model calculates mud jacking plumpness etc., its for problem be still prestress pipe in " bridge structure " mud jacking it is full
The test problems of degree.The assembly concrete shear wall structure of technical barrier when being applied to to(for) Impact echo is not directed to.
Chinese patent CN 106556646A disclose a kind of sound emission tomography and determine damages of concrete structures position
Detecting system, its content of the invention are to utilize acoustic emission detection concrete structure internal injury.This with the invention solves
Technical problem has substantive difference.
The content of the invention
Technical problem：
To overcome Impact echo this technology can not the Grouted density suitable for assembly of shear wall structure very well
This problem is detected, while in order to expand the application of Impact echo, therefore solve to be carried by measures such as technological improvements
The technical barrier gone out.
Technical scheme：
To reach above-mentioned technique effect, the present invention proposes a kind of for detecting slurry anchor overlap joint connecting node Grouted density
Device, described device include auxiliary receiving-transmitting device 1, impact echo instrument 2 and computer 6 and detected wall；
The auxiliary receiving-transmitting device 1 is adjacent in detected surface of wall, and the impact echo instrument 2 is close to aid in receiving-transmitting device 1 to exist
The outer surface of the plane of symmetry of wall is detected, makes exciting in contact alignment auxiliary receiving-transmitting device 1 outer surface on impact echo instrument 2
Line position.Further, described auxiliary receiving-transmitting device 1 includes auxiliary receiving-transmitting device body 11 and absorbing material 12, the auxiliary connect
The rectangular body of profile of device body 11 is sent out, its symmetrical two side is bonded with absorbing material 12, in the closure that remaining four face is formed
On the symmetrical shaft position of the outer surface of three-dimensional shape draw have closure to cathetus 13, it is described to cathetus and detected wall
In metal bellows longitudinal center line overlap.
Further, described impact echo instrument 2 is the single-point type or scan-type impact echo for carrying data collecting system
Instrument, described computer 6 are portable laptop computers or fixed desktop computer.
Further, the material of described auxiliary receiving-transmitting device body 11 is normal concrete, and described absorbing material 12 is
The material of low frequency impact elastic wave can be absorbed.
The present invention is also provided using a kind of above-mentioned method for being used to detect slurry anchor overlap joint connecting node Grouted density, described
Method in detected assembled shearing by setting auxiliary receiving-transmitting device on the outside of wall metal bellows；Then impact echo instrument is used
Detected on auxiliary receiving-transmitting device, obtain the frequency of the Grouted density of institute's detection zone shear wall interior metal bellows-
Amplitude spectrogram, remove pseudo- data；The final Grouted density value for judging to draw grouting material.
Further, methods described specifically includes following steps：
Step 1, first the surface of wall concrete of the detected vertical projection altitude range of wall metal bellows 52 is polished
And the powder and chip of residual are removed, draw metal bellows center line along grouting mouth midline position to wall lower section root；
Step 2, the binding face for aiding in receiving-transmitting device is tightly bonded with surface of wall, makes the centering on the surface of auxiliary receiving-transmitting device 1
The vertical line close alignment that straight line 13 is drawn with surface of wall；
Step 3, impact echo instrument 2 is close to the outer surface for aiding in receiving-transmitting device, makes to excite contact on impact echo instrument 2
It is directed at being impacted to cathetus 13, then opening impact echo instrument 2, from bottom to top slow at the uniform velocity movement for auxiliary receiving-transmitting device outer surface
Echo instrument 2, start to carry out single-point acquiring or scanning to the bellows 52 of slurry anchor overlap joint connection, while collect frequency-width
Value Data；
Step 4, frequency-amplitude data that step 3 is collected are inputted into computer 6, first reject stress wave auxiliary
The pseudo- data generated when helping receiving-transmitting device to be reflected with surface of wall, then generate new frequency-amplitude curve, finally judge that grouting is close
Solidity.
As a preferred embodiment, the method for being used to judge Grouted density in step 4 is：According to the frequency-amplitude curve
The amplitude of middle peak value and the number of appearance judge the position for grouting defect occur.
Further, methods described is used to detect the precast wall body of slurry anchor overlap joint interconnection technique or concentrates constraint overlap joint to connect
The precast wall body connect.
Beneficial effect:By setting auxiliary receiving-transmitting device on the outside of detected fabricated shear wall metal bellows, then make
Detected with impact echo instrument on auxiliary receiving-transmitting device, the grouting for obtaining institute's detection zone shear wall interior metal bellows is close
The frequency of solidity-amplitude spectrogram, then removes pseudo- data, so as to judge to draw the Grouted density of grouting material.The present invention
A kind of apparatus and method for being used to detecting slurry anchor overlap joint connecting node metal bellows Grouted density have that device is simple, side
The advantages of can leaning on, by setting this conventional art of auxiliary receiving-transmitting device Impact echo to be cut very well applied to assembled
This frontier of the detection of Grouted density in power wall construction, has expanded the application of Impact echo significantly.
Brief description of the drawings
Fig. 1 is the principle schematic that impact echo test system detects concrete component in the prior art；
Fig. 2 is the principle schematic that Impact echo detects defect in concrete in the prior art；
Fig. 3 is the General Principle that Impact echo detects pumping of prostressed duct quality in bridge structure；
When Fig. 4 is sets and be not provided with to aid in receiving-transmitting device metal bellows in precast shear wall is detected using Impact echo
The principle signal of Grouted density；
Fig. 5 schematic structural views of the invention；
Receiving-transmitting device schematic diagram is helped supplemented by Fig. 6；
Fig. 7 is the schematic diagram of the embodiment of the present invention one；
Fig. 8 is the schematic diagram of the embodiment of the present invention two；
Fig. 9 is the schematic diagram of the embodiment of the present invention three；
Figure 10 is the precast wall body embodiment schematic diagram for applying the inventive method to concentrate constraint overlap joint connection；
Figure 11 is the testing result schematic diagram of embodiment one；
Reference：1- auxiliary receiving-transmitting device, 2- impact echos instrument, 3- lower floors shear wall, 4- sit pulp layer, the upper story shears of 5-
Wall, 6- computers, 31- lower floors shear wall joint bar, 32 wall stirrups, 33- add joint bar, 51- upper stratas shear wall indulges muscle, 52- gold
Belong to bellows, 53- grouting materials, 53- upper stratas shear wall stirrup, 54- tie hoops.
Embodiment
The existing common precast wall body using slurry anchor overlap joint interconnection technique, according to the unusual of Vertical bar connection
It can be divided into three classes：1. wall vertically connects reinforcing bar as double full connection, accompanying drawing 7 is seen, i.e., every upper strata on upper strata shear wall 5 is cut
The bottom that power wall indulges muscle 51 is correspondingly arranged a metal bellows 52, when wall construction is installed, is first pushed up in lower floor's shear wall 3
Portion, which paves, sits pulp layer 4, then lifts upper strata shear wall 5, lower floor's shear wall joint bar 31 on lower floor's shear wall 3 is just stretched into
On story shear wall 5 in pre-buried metal bellows 52, then irrigating grouting material 53, (generation of grouting material 53 can also be used by sitting pulp material
Replace, do not have to during construction pave, need to only seal the wall bottom surrounding of upper strata shear wall 5, be then in the milk, sit slurry and once complete), fill
The construction and installation of wall are completed after the completion of slurry；2. wall vertical reinforcement is double, but it is in " quincunx " to starch anchor overlap joint connection,
See accompanying drawing 8；3. wall vertical reinforcement to be double, but starch anchor overlap joint be connected as it is single see accompanying drawing 9, such case story shear wall at present
Additional joint bar 33 is evenly arranged with the transverse center line position of the wall stirrup 32 on 3 top, the bottom of upper strata shear wall 5
Metal bellows 52 is evenly arranged with the transverse center line position of wall stirrup 32, now the connection of shear wall is logical up and down
Cross and the additional joint bar 33 on lower floor's shear wall 3 inserted into the metal bellows 52 of upper strata shear wall 5 to complete, remaining process with
1., it is 2. identical.Usually, for precast wall body before construction site is transported to, wall component has been subjected to corresponding component quality
Detection.Site Detection is usually to be carried out after grouting is completed 7 days.And the technical problems to be solved by the invention are predominantly constructed
The Site Detection at scene.
The present invention solve its technical problem institute foundation technical principle be：It is auxiliary by being set on precast shear wall to be detected
Receiving-transmitting device is helped, on the one hand makes the transmission path increase of the stress wave on impulse source, can conveniently detect the front-seat gold of precast shear wall
Belong to the Grouted density of bellows；On the other hand by setting absorbing material in auxiliary receiving-transmitting device both sides so that swash on impulse source
The valid analysing range of the stress wave of hair shrinks, and the stress wave for making to excite is concentrated mainly on certain the row reinforcing bar tested or so model
Enclose, avoid reception sensing and receive excessive interference signal and make the differentiation of metal bellows compactness be difficult to differentiate.Below
The technical principle of the present invention is described in detail.
When directly using the Grouted density of impact echo instrument detection precast shear wall metal bellows, it is assumed that from impact
The stress wave excited on the impulse source of echo instrument is respectively P1、P2、P3、P4、P5……Pn, distinguish accordingly with horizontal angle
For α1、α2、α3、α4、α5……αn, corresponding peak amplitude is respectively f on corresponding frequency-signal amplitude curve1、f2、f3、f4、
f5…… fn.Because the thickness of precast shear wall is smaller (general≤200mm), therefore on the frequency actually obtained-signal amplitude curve
The more difficult differentiation of peak amplitude, while with the increase of angle [alpha], the heel row metal bellows of adjacent column is to pre-detection wavy metal
The influence increase of pipe, it is difficult to draw preferable frequency-signal amplitude curve in practice.Above-mentioned reason also can be explained using routine
Impact echo is not suitable for detecting the Grouted density of connecting node metal bellows in assembly of shear wall structure.
As shown in 4A in Fig. 4, precast shear wall metal wave is carried out using auxiliary connection device when being bonded on precast wall body surface
During the Grouted density of line pipe, it is assumed that the stress wave excited from the impulse source of impact echo instrument is respectively P1、P2、P3、P4、
P5……Pn, it is respectively accordingly α with horizontal angle1、α2、α3、α4、α5……αn, work as αnAt=90 °, PnCan be straight along straight line
It is reversed to penetrate without being received by reception sensor；Work as αnDuring 90 ° of ＞, PnDirectly it can be absorbed by the absorbing material of auxiliary receiving-transmitting device both sides
Without reflecting.Therefore after being provided with auxiliary receiving-transmitting device, receiving the effective stress ripple that sensor receives can greatly reduce, therefore real
Peak amplitude on the frequency that border obtains-signal amplitude curve is easier to differentiate, simultaneously as working as αnDuring 90 ° of ＞, PnCan be by suction ripple material
Material directly absorbs, therefore influence of the heel row metal bellows of adjacent column to metal bellows to be detected does not almost have, such as 4B in Fig. 4
It is shown, then it is easy to draw preferable frequency-signal amplitude curve in practice, is correspondingly also easy to differentiate metal bellows
Grouted density.As fully visible, due to being provided with auxiliary receiving-transmitting device on precast concrete surface, so that traditional impact is returned
Ripple instrument can be used for the Grouted density for detecting precast shear wall connecting node metal bellows more conveniently.
Embodiment one：
When wall vertical reinforcement to be checked is double connection (specifically as shown in Figure 7), the first step first finds story shear
The upper irrigation and drainage slurry mouth of the metal bellows 52 of wall 5, then polishes the surface of wall concrete in its vertical projection altitude range
And residual powder or chip are removed, fully ensure that cleaning and the planarization of surface of wall concrete.Filled again along metal bellows 52
Mouth position of center line is starched to drafting metal bellows center line below wall, until the wall root of upper strata shear wall 5；Second step will
The binding face of auxiliary receiving-transmitting device 1 is tightly bonded with the surface of the upper strata shear wall 5 through cleaning, makes pair on the surface of auxiliary receiving-transmitting device 1
The vertical line close alignment that cathetus 6 is drawn with surface of wall；Impact echo instrument 2 is close to the appearance for aiding in receiving-transmitting device by the 3rd step
Face, make on impact echo instrument excite contact alignment auxiliary receiving-transmitting device 1 outer surface to cathetus 6, then open impact echo
Instrument 2, uniform speed slow movement impact echo instrument 2, starts to be scanned the metal bellows 52 of slurry anchor overlap joint connection from bottom to top,
Scanning collection obtains frequency-amplitude data simultaneously.4th step programs on computer 6, and the frequency that the 3rd step is collected-
Amplitude data is input in program, is first rejected stress wave and is generated when aiding in receiving-transmitting device 1 to be reflected with the surface of wall of upper strata shear wall 5
" pseudo- data ", then generate new frequency-amplitude curve, finally judge Grouted density again.It is in the milk according to metal bellows 5
The difference for the position that defect occurs, can obtain Figure 11 testing result.
As seen from Figure 11, particularly may be divided into when wall vertical reinforcement to be checked is double connection, the defects of metal bellows 5
Following four situation.
Operating mode one：Front-seat metal bellows slip casting leakiness, heel row metal bellows slip casting are closely knit.Now impact source excitation
Stress wave some can be transferred at the boundary defect for receiving sensor and surface of wall, connect after reflection by reception sensor
Receive；Some can be transferred to the outer surface of front-seat metal bellows to stress wave, be received after reflection by reception sensor；Stress wave
Some can be transferred to the rear surface of precast shear wall, then be received after reflection by reception sensor.Correspondingly can be in frequency
Three obvious crests are formed on rate-signal amplitude curve map, are respectively defined as crest ff、f、fd, wherein ffFor " spurious peaks ",
Formed when being at the received sensor of stress wave and the boundary defect on the preceding surface of precast shear wall, it is to differentiating metal bellows
Grouted density do not act on, therefore weed out.When the auxiliary receiving-transmitting device and embedded metal bellows precast wall body thickness that measure
The frequency peaks caused by embedded metal bellows precast wall body thickness sum with auxiliary receiving-transmitting device and not of frequency peak f caused by sum
Value f is essentially identical, or to low frequency gentle drift and another high frequency peaks f occursdWhen, it can determine whether as wall front row wavy metal
Pipe grouting leakiness, heel row metal bellows slip casting are closely knit.
Operating mode two:Front-seat metal bellows slip casting leakiness, heel row metal bellows slip casting leakiness.Now impulse source swashs
Some can be transferred at the boundary defect for receiving sensor and surface of wall the stress wave of hair, by reception sensor after reflection
Receive；Some can be transferred to the outer surface of front-seat metal bellows to stress wave, be received after reflection by reception sensor；Stress
Some can be transferred to the outer surface of heel row metal bellows to ripple, be received after reflection by reception sensor；Stress wave also has one
Part can be transferred to the rear surface of precast shear wall, then be received after reflection by reception sensor.Correspondingly can be in frequency-signal
Four obvious crests are formed on amplitude curve figure, are respectively defined as crest ff、f、fv、fd, wherein ffFor " spurious peaks ", being should
Formed when at the boundary defect on the received sensor in Reeb and the preceding surface of precast shear wall, it is to differentiating the filling of metal bellows
Slurry compactness does not act on, therefore weeds out.When the auxiliary receiving-transmitting device and embedded metal bellows precast wall body thickness sum that measure
Caused frequency peak f frequency peak f caused by embedded metal bellows precast wall body thickness sum with auxiliary receiving-transmitting device and not
It is essentially identical, or to low frequency gentle drift and there is high frequency peaks f similar in two valuesv、fdWhen, it can determine whether as wall front row
Metal bellows grouting leakiness, heel row metal bellows slip casting leakiness.
Operating mode three：Front-seat metal bellows slip casting is closely knit, and heel row metal bellows slip casting is closely knit.Now impact source excitation
Some can be transferred at the boundary defect for receiving sensor and surface of wall stress wave, be connect after reflection by reception sensor
Receive；Some can be transferred to the rear surface of precast shear wall to stress wave, then be received after reflection by reception sensor.Accordingly
Ground can form two obvious crests on frequency-signal amplitude curve map, be respectively defined as crest ff, f, wherein ffFor " pseudo wave
Peak ", formed when being at the received sensor of stress wave and the boundary defect on the preceding surface of precast shear wall, it is to differentiating metal wave
The Grouted density of line pipe does not act on, therefore weeds out.When the auxiliary receiving-transmitting device and embedded metal bellows precast wall body that measure
The frequencies caused by embedded metal bellows precast wall body thickness sum with auxiliary receiving-transmitting device and not of frequency peak f caused by thickness sum
Rate peak value f is essentially identical, and when occurring without obvious high frequency peaks afterwards, can determine whether to fill for wall front row metal bellows
Starch closely knit, heel row metal bellows slip casting is closely knit.
Operating mode four：Front-seat metal bellows slip casting is closely knit, heel row metal bellows slip casting leakiness.Front-seat metal bellows
Slip casting leakiness, heel row metal bellows slip casting leakiness.Now impact source excitation stress wave some can be transferred to and connect
At the boundary defect for receiving sensor and surface of wall, received after reflection by reception sensor；Stress wave some can be transferred to
The outer surface of heel row metal bellows, received after reflection by reception sensor；Stress wave some can be transferred to prefabricated cut
The rear surface of power wall, then received after reflection by reception sensor.Three correspondingly can be formed on frequency-signal amplitude curve map
Individual obvious crest, is respectively defined as crest ff、f、fv, wherein ffFor " spurious peaks ", be the received sensor of stress wave with it is prefabricated
Formed when at the boundary defect on the preceding surface of shear wall, it is picked to differentiating that the Grouted density of metal bellows does not act on
Remove.As frequency peak f caused by the auxiliary receiving-transmitting device and embedded metal bellows precast wall body thickness sum measured and auxiliary
Frequency peak f caused by receiving-transmitting device and not embedded metal bellows precast wall body thickness sum is essentially identical or slight to low frequency
Drift about and another high frequency peaks f occurvWhen, it can determine whether as closely knit, the heel row wavy metal of wall front row metal bellows grouting
Pipe slip casting leakiness.
Embodiment two：
As shown in Figure 8, when wall vertical reinforcement to be checked is double, but starches the connection of anchor overlap joint in " quincunx " distribution,
Preparation and detection process before detection is the same as embodiment one.Testing result now is similar with the result of embodiment one.Specifically
Ground, when the metal bellows for starching anchor overlap joint connection is located at close to auxiliary receiving-transmitting device side, it is divided into two kinds of situations：1. it is close to be in the milk
It is real, at this moment only have an obvious crest on frequency-signal amplitude curve map；2. leakiness of being in the milk, such case is equivalent to implementation
In example one " operating mode one ", its result and decision method are identical with its.
When the metal bellows for starching anchor overlap joint connection is located remotely from auxiliary receiving-transmitting device side, two kinds of situations can be divided into again：
1. it is closely knit to be in the milk, such case equivalent in embodiment one " operating mode three ", its result and decision method are identical with its；②
Be in the milk leakiness, such case equivalent in embodiment one " operating mode four ", its result and decision method are identical with its.
Embodiment three：
As shown in Figure 9, when wall vertical reinforcement to be checked is double, but slurry anchor overlap joint is connected as single distribution, detection
Preceding preparation and detection process are the same as embodiment one.Testing result now is similar with the result of embodiment one.Specifically, may be used
It is divided into two kinds of situations：1. it is closely knit to be in the milk, such case equivalent in embodiment one " operating mode one ", its result and decision method with
Its is identical；2. leakiness of being in the milk, such case equivalent in embodiment one " operating mode three ", its result and decision method with
Its is identical.
Example IV：
Further, except can be used for detecting the existing common precast wall body using slurry anchor overlap joint interconnection technique
In addition, the present invention can be additionally used in precast wall body (specific visible Chinese patent CN of the detection using " concentrating the connection of constraint overlap joint "
Grouted density 104929279B).Specifically, as shown in Figure 10, this connection is that gold is reserved in upper strata shear wall 5
Belong to bellows 52, the outside of metal bellows 52 is constrained using tie hoop 55, story shear under being inserted in metal bellows 52
Lower floor's shear wall joint bar 31 of wall 3, grouting material 53 is then irrigated, so as to realize that the overlap joint of precast shear wall vertical reinforcement connects.
During this wall detection, it need to only change the sectional dimension of auxiliary receiving-transmitting device 1, the method that can then proceed in embodiment three is examined
Survey, its testing result is substantially the same with embodiment three.
The above is only the preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-described embodiment,
All technical schemes belonged under thinking of the present invention belong to protection scope of the present invention.It should be pointed out that for the art
For those of ordinary skill, some improvements and modifications without departing from the principles of the present invention, the protection of the present invention should be regarded as
Scope.
Claims (8)
1. a kind of device for being used to detect slurry anchor overlap joint connecting node Grouted density, it is characterised in that described device includes auxiliary
Help receiving-transmitting device (1), impact echo instrument (2) and computer (6) and detected wall；
The auxiliary receiving-transmitting device (1) is adjacent in detected surface of wall, and the impact echo instrument (2) is close to aid in receiving-transmitting device (1)
In the outer surface for the plane of symmetry for being detected wall, make to excite contact alignment auxiliary receiving-transmitting device (1) appearance on impact echo instrument (2)
The midline position in face.
2. a kind of device for being used to detect slurry anchor overlap joint connecting node Grouted density according to claim 1, its feature
It is, described auxiliary receiving-transmitting device (1) includes auxiliary receiving-transmitting device body (11) and absorbing material (12), the auxiliary receiving-transmitting device sheet
The rectangular body of body (11) profile, its symmetrical two side are bonded with absorbing material (12), are stood in the closure that remaining four face is formed
On the symmetrical shaft position of the outer surface of shape draw have closure to cathetus (13), it is described to cathetus and detected wall
In metal bellows longitudinal center line overlap.
3. a kind of device for being used to detect slurry anchor overlap joint connecting node Grouted density according to claim 1, its feature
It is, described impact echo instrument (2) is to carry the single-point type or scan-type impact echo instrument of data collecting system, described meter
Calculation machine (6) is portable laptop computers or fixed desktop computer.
4. a kind of device for being used to detect slurry anchor overlap joint connecting node Grouted density according to claim 2, its feature
It is, the material of described auxiliary receiving-transmitting device body (11) is normal concrete, and described absorbing material (12) is to absorb
The material of low frequency impact elastic wave.
5. a kind of using device as claimed in claim 1 is used to detect the method for starching anchor overlap joint connecting node Grouted density,
Characterized in that, methods described in detected assembled shearing by setting auxiliary receiving-transmitting device on the outside of wall metal bellows；So
Detected afterwards using impact echo instrument on auxiliary receiving-transmitting device, obtain the filling of institute's detection zone shear wall interior metal bellows
The frequency-amplitude spectrogram of compactness is starched, removes pseudo- data；The final Grouted density value for judging to draw grouting material.
6. a kind of method for being used to detect slurry anchor overlap joint connecting node Grouted density according to claim 4, its feature
It is, methods described specifically includes following steps：
Step 1, first the surface of wall concrete of detected wall metal bellows (52) vertical projection altitude range is polished simultaneously
The powder and chip of residual are removed, metal bellows center line is drawn along grouting mouth midline position to wall lower section root；
Step 2, the binding face for aiding in receiving-transmitting device is tightly bonded with surface of wall, makes the centering on auxiliary receiving-transmitting device (1) surface straight
The vertical line close alignment that line (13) is drawn with surface of wall；
Step 3, impact echo instrument (2) is close to the outer surface for aiding in receiving-transmitting device, makes to excite contact on impact echo instrument (2)
Alignment auxiliary receiving-transmitting device outer surface to cathetus (13), then open impact echo instrument (2), slowly at the uniform velocity move from bottom to top
Impact echo instrument (2), start to carry out single-point acquiring or scanning to the bellows (52) of slurry anchor overlap joint connection, collect simultaneously
Frequency-amplitude data；
Step 4, frequency-amplitude data that step 3 is collected are inputted into computer (6), are first rejected stress wave and are being aided in
The pseudo- data that receiving-transmitting device generates when being reflected with surface of wall, then generate new frequency-amplitude curve, finally judge that grouting is closely knit
Degree.
7. a kind of method for being used to detect slurry anchor overlap joint connecting node Grouted density according to claim 6, its feature
It is, the method for being used to judge Grouted density in step 4 is：According to the amplitude of peak value in the frequency-amplitude curve and
The number of appearance judges the position for grouting defect occur.
8. a kind of method for being used to detect slurry anchor overlap joint connecting node Grouted density according to claim 6, its feature
It is, methods described is used for the precast wall body for detecting slurry anchor overlap joint interconnection technique or the dry wall for concentrating constraint overlap joint connection
Body.
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| CN117607255A (en) * | 2023-11-27 | 2024-02-27 | 中铁五局集团机械化工程有限责任公司 | Performance monitoring method, system and device for prestressed concrete structure |
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