CN103499643B - The quantitative testing device of pumping of prostressed duct plumpness situation and method - Google Patents
The quantitative testing device of pumping of prostressed duct plumpness situation and method Download PDFInfo
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Abstract
The invention discloses a kind of quantitative testing device and method of pumping of prostressed duct plumpness situation, the method comprises location deformed bar, arrangement prestress pipeline survey line and measuring point, measure impact echo in concrete component and touch the end average reflection time, measure prestress pipe impact echo to touch the reflection interval end and utilize pumping of prostressed duct plumpness computation model to calculate mud jacking plumpness, pumping of prostressed duct plumpness computation model is f=Kt+b, t is the ratio that prestress pipe impact echo touches that the reflection interval end and impact echo in concrete component touch the end average reflection time, this computation model is 0 by measuring also calculated prestressing force pipeline pneumatic mortar plumpness f, 50%, t when 100%, t is carried out linear fit with grouting saturation degree f obtain, pass through the present invention, solve Impact echo in prior art and can only complete the qualitative judgement of defect, the problem that test result reliability is low, make the relative error <5% that pumping of prostressed duct plumpness is measured.
Description
Technical field
The present invention relates to a kind of quantitative testing device and method of pumping of prostressed duct plumpness situation, particularly relate to a kind of quantitative testing device and the method that are applied to the pumping of prostressed duct plumpness situation of bridge prestress pipeline.
Background technology
For the prestressing with bond reinforcing bar in prestressed concrete continuous box girder bridge concrete girder, adopt post stretching, have the pre-stressed construction method of bonding.In order to ensure deformed bar and surrounding concrete good combination and co-operation, bonding between deformed bar and concrete is by after deformed bar stretch-draw, formed after pouring into the sclerosis of high performance grout, full grout both can avoid deformed bar corrosion simultaneously, improve the permanance of prestressed reinforced concrete construction, in turn ensure that deformed bar and concrete co-operation.But the situation ubiquity that at present prestress hole path pressure grouting is not full, causes the corrosion of deformed bar thus, anchor head stress concentrates and the disease such as the loss of prestress of passing in time.As detected the using state of deformed bar not in time, assessing its influence degree to structure durability, then may affect the stress of structure, reduce the bearing capacity of bridge, affect the serviceable life of bridge.Therefore the pumping of prostressed duct quality testing of pre-stressed bridge guarantees that bridge construction quality reaches an important controlling unit of designing requirement and operation reasonable mechanical state.Deformed bar belongs to concealed work, the control of the grouting quality in pipeline, usually carry out quality control at casting craft and the scene of building more apparently, once concreting is shaping, then cannot detect the quality problems that its inside may exist, this also adds cost for later bridge maintenance.
At present, in domestic and international detection bodies, the method for deformed bar hole path pressure grouting packing situation mainly contains: Impact echo, supercritical ultrasonics technology, ground penetrating radar method, rays method etc.1. Impact echo utilizes a physical shock in short-term to produce the stress wave of low frequency, stress wave is roundtrip between component surface, inherent vice surface or component surface bottom boundary, thus produce transient state resonance, its resonant frequency can be recognized in spectral amplitude, and determines the degree of depth of inherent vice and the thickness of component with this.The method has not by the impact of metal pipe line, test specification greatly, to external world operating environment require the advantages such as lower.2. supercritical ultrasonics technology utilize pulsed ultrasonic wave to propagate in concrete sound time (or velocity of sound), wave amplitude and the relative change of the parameters,acoustics such as frequency analyze and judge defect situation.The method is applicable to Through Several Survey Measure (one side, two-sided, through, reflection etc.), but ultrasound wave cannot penetrate plastic film capicitor, because the detection not being suitable for the inner mud jacking situation of plastic ripple pipeline 3. ground penetrating radar method launches frequency electromagnetic waves by emitting antenna to underground, the electromagnetic wave being reflected back ground is received by receiving antenna, reflect when running into the interface that there is electrical property difference when electromagnetic wave is propagated in underground medium, according to receiving electromagnetic waveform, the variation characteristic of oscillator intensity and time infers the locus of underground medium, structure, form and depth of burial.This method is comparatively ripe due to its technology, to advantages such as metal sensitivities, thus is widely used in concrete nondestructive testing.But prestressed girder has two class grout lines, i.e. the nonmetallic pipe such as metal material pipe and PVC material.What electromagnetic wave propagation and reflection mainly depended on material lures electrical characteristics, because the permitivity of metal tube is very big, has very large shielding, so electromagnetic radar is not suitable for the grouting detection of metallic conduit to the situation of inside.4. rays method utilize different material to the absorptivity of x light (or gamma-rays) to some extent difference test, the absorptivity of part to x light that namely filling is closely knit is high, thus light sensitivity is lower, and have the part in cavity then contrary, light sensitivity is higher.Because x photoimaging technical testing result is distinct intuitively, judging nicety rate is high, therefore very early by trial application.But x light imaging apparatus is complicated, has certain radiation.The test philosophy of gamma-rays imaging technique is identical with the test philosophy of x photoimaging, and just gamma-ray penetration power is higher, can test thicker beam slab.But the testing apparatus of γ line is general more complicated, radiation is large, seldom practical application at present.
Impact echo method test result is better and ease for use is better, but existing technical merit mostly adopts, with Fast Fourier Transform (FFT) (FFT), time domain waveform is converted into amplitude spectrum, thus the impact echo frequency that acquisition receive MUT arrives, judgement for defect also stay in or without, or roughly judge size, the position of defect by rule of thumb, namely be also in the qualitative stage of defect, this makes its test result always not fully up to expectations.
Summary of the invention
For overcoming the deficiency that above-mentioned prior art exists, the fundamental purpose of the present invention is the quantitative testing device and the method that provide a kind of pumping of prostressed duct plumpness situation, the relational model of the reflection interval end is touched by the mud jacking plumpness and impact echo setting up prestress pipe, the mud jacking plumpness of quantitative measurement prestress pipe, solve Impact echo in prior art and can only complete the qualitative judgement of defect, problem that test result reliability is low, the relative error <5% that the pumping of prostressed duct plumpness of the present invention is measured.
For reaching above-mentioned and other object, the present invention proposes a kind of quantitative testing device of pumping of prostressed duct plumpness situation, comprise radiating circuit, low frequency stress pulse energizer, signal amplifier, low frequency stress pulse receiver, programmable filter, charge amplifier, A/D converter, data acquisition unit, data-carrier store, dsp processor and CPU, described low frequency stress pulse energizer is placed in surface of concrete structure near described low frequency stress pulse receiver, described low frequency stress pulse receiver is placed on the measuring point of concrete component, the signal output part of described CPU connects the input end of described radiating circuit, the output terminal of the radiating circuit of described low frequency stress pulse energizer produces the stress wave of low frequency, return through component bottom reflection after stress wave propagation to xoncrete structure inside, the input end that reflection wave is placed in the described low frequency stress pulse receiver on the measuring point of concrete component through described signal amplifier accepts, the signal output part of described low frequency stress pulse receiver by low frequency stress ripple through described programmable filter, described charge amplifier and described A/D converter are sent to described data acquisition unit, the signal collected is sent in described data-carrier store by described data acquisition unit, electric signal in data-carrier store is carried out signal transacting according to the controller in described CPU by described dsp processor, memory storage in described CPU stores the signal that described dsp processor process completes, arithmetical unit in described CPU is used for the mud jacking plumpness calculating pipeline according to calibration formula.
Further, described quantitative testing device also comprises operation keyboard and display, and described operation keyboard is used for external data input, and described display is used for the sweep waveform of display low frequency stress ripple and the test result of pumping of prostressed duct plumpness in real time.
For achieving the above object, the present invention also provides a kind of quantitative detecting method of pumping of prostressed duct plumpness situation, comprises the steps:
Step one, utilizes high-frequency electromagnetic wave excitation device and receiving trap to launch frequency electromagnetic waves to concrete component, is received the electromagnetic wave reflected by signal receiver, according to position and the trend of the electromagnetic wave signal determination deformed bar received;
Step 2, concrete component upper surface along deformed bar move towards arrange concrete component survey line 1 and prestress pipe survey line 2 and point position;
Step 3, measures impact echo in concrete component and touches the average reflection end, t time
p;
Step 4, measures impact echo in prestress pipe and touches the t reflection interval end
i;
Step 5, touches the average reflection end, t time according to impact echo in described concrete component
pthe t reflection interval end is touched with impact echo in described prestress pipe
i, measure prestress pipe under the condition of difference grouting situation in described prestress pipe impact echo touch the t reflection interval end
ithe average reflection end, t time is touched with impact echo in described concrete component
pratio and the corresponding relation of mud jacking plumpness, the computation model of pumping of prostressed duct plumpness is obtained by calibration result, the computation model of described pumping of prostressed duct plumpness is f=Kt+b, wherein, f is the mud jacking plumpness of prestress pipe, K is time coefficient, and t is that prestress pipe impact echo touches the t reflection interval end
ithe average reflection end, t time is touched with impact echo in concrete component
pratio, b is relation constant;
Step 6, gather survey impact echo in the concrete component of each measuring point of prestress pipe and touch the average reflection end, t time
pthe t reflection interval end is touched with impact echo in prestress pipe
i, according to the computation model of pumping of prostressed duct plumpness, calculate the mud jacking plumpness situation of each measuring point;
Step 7, by the mud jacking plumpness situation line of each measuring point, forms the mud jacking situation of whole pipeline.
Further, in step 7, the mud jacking plumpness situation of adjacent two measuring points differs by more than appointment ratio, increases measuring point number between two measuring points, then line reflects the mud jacking situation of this part pipeline.
Further, described step one comprises the steps:
(1) emitting antenna of ground penetrating radar is utilized to launch frequency electromagnetic waves to underground, the electromagnetic wave being reflected back ground is received by receiving antenna, reflect when running into the interface that there is electrical property difference when electromagnetic wave is propagated in underground medium, according to the locus and the buried depth that receive electromagnetic waveform, oscillator intensity and the variation characteristic of time and infer deformed bar in bridge structure, to mark mark at concrete surface;
(2) mark mark is linked to be line, determines the position of deformed bar.
Further, in step 2, along deformed bar trend distance Member Lip 10 ~ 20cm place, the concrete component upper surface of prestress pipe is not had to arrange survey line 1, or corresponding concrete component upper surface arranges survey line 1 and measuring point in centre position, two prestress pipe axis, the two selects one; Along the trend of deformed bar at the location arrangements survey line 2 of the corresponding prestress pipe of concrete component upper surface, survey line 1 and 2 evenly arranges measuring point.
Further, in step 3, take concrete component as determination object, in described concrete component, the measuring point place of impact echo survey line 1 arranges low frequency stress pulse excitation device and low frequency stress reception of impulse device, when low frequency stress reception of impulse device receives resonance wave signal, record is demarcated impact echo in described concrete component and is touched the t reflection interval end
pi, move described low frequency stress pulse excitation device and described low frequency stress reception of impulse device along impact echo survey line 1 in described concrete component, the echo measuring each measuring point place touches the t reflection interval end simultaneously
piand calculate its mean value, be designated as impact echo in concrete component and touch the average reflection end, t time
p.
Further, in step 4, take prestress pipe as determination object, in described prestress pipe, low frequency stress pulse excitation device and low frequency stress reception of impulse device are installed by the measuring point place of impact echo survey line 2, produce the stress pulse of low frequency, returned by component bottom reflection after propagating into inside configuration, stress wave roundtrip between the border of component end face, pipe interior, component bottom surface produces transient state resonance, and impact echo to be obtained touches the t reflection interval end
i, move described low frequency stress pulse excitation device and described low frequency stress reception of impulse device along impact echo survey line 2 in described prestress pipe simultaneously, measure the t at each measuring point place
ivalue.
Further, in step 5, the defining method of the computation model of described pumping of prostressed duct plumpness is: set pumping of prostressed duct plumpness as not being in the milk, 50% grouting, 100% grouting, measure impact echo in described prestress pipe and touch the t reflection interval end
ithe average reflection end, t time is touched with impact echo in concrete component
p, calculated prestressing force pipeline impact echo touches the t reflection interval end
ithe average reflection end, t time is touched with impact echo in concrete component
pratio t, with ratio t for horizontal ordinate, grouting saturation degree f is ordinate, by ratio t with grouting saturation degree f carry out the computation model that linear fit obtains described pumping of prostressed duct plumpness, wherein, when f>=100%, get f=100%; When f≤0%, get f=0%.
Further, described in step 3 and step 4, low frequency stress pulse excitation device is steel hammer, and adopt single-point type Impact echo, the selection of the excited frequency of described steel hammer is relevant with the thickness of concrete component.
Compared with prior art, the quantitative testing device of a kind of pumping of prostressed duct plumpness of the present invention situation and method touch the relational model of the reflection interval end by the mud jacking plumpness and impact echo setting up prestress pipe, the mud jacking plumpness of quantitative measurement prestress pipe, solve Impact echo in prior art and can only complete the qualitative judgement of defect, problem that test result reliability is low, make the relative error <5% that pumping of prostressed duct plumpness is measured.
Accompanying drawing explanation
Fig. 1 is the configuration diagram of the preferred embodiment of the quantitative testing device of a kind of pumping of prostressed duct plumpness of the present invention situation;
Fig. 2 is the flow chart of steps of the quantitative detecting method of a kind of pumping of prostressed duct plumpness of the present invention situation;
Fig. 3 is the layout schematic diagram of survey line and measuring point in present pre-ferred embodiments;
Fig. 4 is the schematic diagram that in present pre-ferred embodiments, exciting produces low frequency stress ripple;
Fig. 5 is the mud jacking situation schematic diagram of prestress pipe of the present invention;
Fig. 6 a to Fig. 6 c is the linear fit schematic diagram of the computation model of the mud jacking plumpness of variant prestress pipe in the present invention;
Fig. 7 a to Fig. 7 c is respectively the mud jacking plumpness situation schematic diagram of the point layout of the survey line 1 of the specific embodiment of the invention 1, the point layout of survey line 2 and whole prestress pipe;
Fig. 8 a to Fig. 8 c is respectively the mud jacking plumpness situation schematic diagram of the point layout of the survey line 1 of the specific embodiment of the invention 2, the point layout of survey line 2 and whole prestress pipe;
Fig. 9 a to Fig. 9 c is respectively the mud jacking plumpness situation schematic diagram of the point layout of the survey line 1 of the specific embodiment of the invention 3, the point layout of survey line 2 and whole prestress pipe.
Reference numeral: 1-radiating circuit, 2-low frequency stress pulse energizer, 3-signal amplifier, 4-low frequency stress pulse receiver, the programmable wave filter of 5-, 6-charge amplifier, 7-A/D converter, 8-data acquisition unit, 9-data buffer, 10-DSP processor, 11-CPU, 12-storer, 13-operation keyboard, 14-display, 15-tested object.
Embodiment
Below by way of specific instantiation and accompanying drawings embodiments of the present invention, those skilled in the art can understand other advantage of the present invention and effect easily by content disclosed in the present specification.The present invention is also implemented by other different instantiation or is applied, and the every details in this instructions also can based on different viewpoints and application, carries out various modification and change not deviating under spirit of the present invention.
Fig. 1 is the configuration diagram of the preferred embodiment of the quantitative testing device of a kind of pumping of prostressed duct plumpness of the present invention situation.As shown in Figure 1, the quantitative testing device of a kind of pumping of prostressed duct plumpness of the present invention situation, comprising: radiating circuit (1), low frequency stress pulse energizer (2), signal amplifier (3), low frequency stress pulse receiver (4), programmable wave filter (5), charge amplifier (6), A/D converter (7), data acquisition unit (8), data buffer (9), dsp processor (10), CPU (11), storer (12), operation keyboard (13), display (14).
Low frequency stress pulse energizer (1) is placed in surface of concrete structure near low frequency stress pulse receiver (3), and low frequency stress pulse receiver (3) is placed on the measuring point of concrete component.The signal output part of CPU (11) connects the input end of radiating circuit (1), low frequency stress pulse energizer (2) is through the stress wave of the output terminal generation low frequency of radiating circuit (1), stress wave propagation is returned through component bottom reflection after concrete (tested object 15) inside configuration, the input end that reflection wave is placed in the low frequency stress pulse receiver (4) on the measuring point of concrete component through signal amplifier (3) accepts, the signal output part of low frequency stress pulse receiver (4) by low frequency stress ripple through programmable filter (5), charge amplifier (6) and A/D converter (7) are sent to data acquisition unit (8), the signal collected is sent in data buffer (9) by data acquisition unit (8), the steering order that electric signal in data buffer (9) sends according to CPU (11) is carried out signal transacting by dsp processor (10), the calibration formula (computation model) stored in the signal data that CPU (11) has processed according to dsp processor (10) and storer (12), calculate the mud jacking plumpness of pipeline.Storer (12) is for storing calibration formula and result of calculation, and operation keyboard (13) inputs for external data; Display (14) is for the test result of the sweep waveform and pumping of prostressed duct plumpness that show low frequency stress ripple in real time.
In present pre-ferred embodiments, the parameter attribute of low frequency stress pulse receiver (3) as table 1, but not as limit.
Table 1
| Charge sensitivity | Frequency range (± 10%) | Amplitude is linear | Lateral charge sensitivity |
| 3.0pc/m/s2 | 0.1～8,000Hz | 20000g | 5.0％ |
In present pre-ferred embodiments, the parameter attribute of charge amplifier (6) as table 2, but not as limit.
Table 2
In present pre-ferred embodiments, the parameter attribute of A/D converter (7) as table 3, but not as limit.
Table 3
| Resolution | 16bit |
| Nonlinearity erron | ±5LSB |
In present pre-ferred embodiments, to the performance requirement of data acquisition unit (8), dsp processor (10) as table 4.
Table 4
Fig. 2 is the flow chart of steps of the quantitative detecting method of a kind of pumping of prostressed duct plumpness of the present invention situation.As shown in Figure 2, the quantitative detecting method of a kind of pumping of prostressed duct plumpness of the present invention situation, comprises the steps:
Step 201, determine the position of deformed bar: utilize high-frequency electromagnetic wave excitation device and receiving trap, launch frequency electromagnetic waves to concrete component, received the electromagnetic wave reflected by signal receiver, according to position and the trend of the electromagnetic wave signal determination deformed bar received.Specifically, in present pre-ferred embodiments, the determination of deformed bar position comprises the steps:
(1) emitting antenna of ground penetrating radar is utilized to launch frequency electromagnetic waves to underground, the electromagnetic wave being reflected back ground is received by receiving antenna, reflect when running into the interface that there is electrical property difference when electromagnetic wave is propagated in underground medium, according to the locus and the buried depth that receive electromagnetic waveform, oscillator intensity and the variation characteristic of time and infer deformed bar in bridge structure, to mark mark at concrete surface.
(2) mark mark is linked to be line, determines the position of deformed bar.
Step 202, the location arrangements according to deformed bar: 1. concrete component survey line 1 and point position; 2. prestress pipe survey line 2 and point position.In present pre-ferred embodiments, according to step 201 along deformed bar move towards arrange concrete component survey line 1 and prestress pipe survey line 2, the length of survey line 1 and 2 is whole prestress pipe length, and in survey line 1 and 2, the spacing of each measuring point is 10cm.Specifically, along deformed bar trend distance Member Lip 10 ~ 20cm place, do not have the concrete component upper surface of prestress pipe to arrange survey line 1, or the concrete component upper surface corresponding in centre position, two prestress pipe axis arranges survey line 1 and measuring point, the two selects one; Along the trend of deformed bar at the location arrangements survey line 2 of the corresponding prestress pipe of concrete component upper surface, survey line 1 and 2 evenly arranges measuring point, and as shown in Figure 3, wherein dotted line is survey line 1, and solid line is survey line 2.
Impact echo survey line 1 in concrete component is arranged at the upper surface of the concrete component corresponding with the axis of prestress pipe, on the upper surface that centre position, two prestress pipe axis adjacent in same level is corresponding, impact echo survey line 2 in arrangement prestress pipeline, survey line evenly arranges measuring point.
Step 203, the impact echo measuring each measuring point in concrete component touches the t reflection interval end
pi,the impact echo of each measuring point is touched the t reflection interval end
piafter averaging, obtain impact echo and touch the average reflection end, t time
p: take concrete component as determination object, in concrete component, the measuring point place of impact echo survey line 1 arranges low frequency stress pulse excitation device and low frequency stress reception of impulse device, when low frequency stress reception of impulse device receives resonance wave signal, record is demarcated impact echo in concrete component and is touched the t reflection interval end
pi, move low frequency stress pulse excitation device and low frequency stress reception of impulse device along impact echo survey line 1 in concrete component, the echo measuring each measuring point place touches the t reflection interval end simultaneously
piand calculate its mean value, be designated as impact echo in concrete component and touch the average reflection end, t time
p.In present pre-ferred embodiments, avoid prestress pipe, choose the concrete surface of structure relatively simple (bar-mat reinforcement density low, without structure steel plate) in its vicinity, adopt single-point type Impact echo, utilize little steel hammer (wherein, the selection of steel hammer excited frequency is relevant with the thickness of concrete component, as shown in table 5), apply physical shock, the low frequency stress pulse produced, as shown in Figure 4, propagate into inside configuration, returned by component bottom reflection.Stress wave roundtrip between the border of component end face, component bottom surface produces transient state resonance, obtains the tactile average reflection end, t time of resonance wave
p.
Table 5 excited frequency correspondence test thickness range table
Step 204, measures impact echo in prestress pipe and touches the t reflection interval end
i: take prestress pipe as determination object, in prestress pipe, low frequency stress pulse excitation device and low frequency stress reception of impulse device are installed by the measuring point place of impact echo survey line 2, produce the stress pulse of low frequency, returned by component bottom reflection after propagating into inside configuration, stress wave roundtrip between the border of component end face, pipe interior, component bottom surface produces transient state resonance, the t tactile reflection interval end of resonance wave to be obtained
i; Move low frequency stress pulse excitation device and low frequency stress reception of impulse device along impact echo survey line 2 in prestress pipe simultaneously, measure the t at each measuring point place
ivalue.In present pre-ferred embodiments, along the measuring point of prestress pipe, apply physical shock, produce the stress pulse of low frequency, propagate into inside configuration, returned by component bottom reflection.Stress wave roundtrip between the border of component end face, pipe interior, component bottom surface produces transient state resonance, obtains the t tactile reflection interval end of resonance wave
i.
Step 205, touches the average reflection end, t time according to impact echo in the concrete component that step 203 and step 204 obtain
pthe t reflection interval end is touched with impact echo in prestress pipe
i, demarcate prestress pipe not being in the milk, 50% grouting, 100% grouting condition under (as shown in Figure 5), in prestress pipe, impact echo touches the t reflection interval end
ithe average reflection end, t time is touched with impact echo in concrete component
pratio and the corresponding relation of mud jacking plumpness, and fitting a straight line relation curve, is obtained the computation model (calibration formula) of pumping of prostressed duct plumpness by calibration result:
f＝Kt+b (1)
Wherein: f is the mud jacking plumpness (%) of prestress pipe, and K is time coefficient, t is that prestress pipe impact echo touches the t reflection interval end
ithe average reflection end, t time is touched with impact echo in concrete component
pratio, b is relation constant, wherein, when f>=100%, gets f=100%; When f≤0%, get f=0%.
Specifically, set pumping of prostressed duct plumpness as not being in the milk, 50% grouting, 100% grouting, measure impact echo in prestress pipe and touch the t reflection interval end
ithe average reflection end, t time is touched with impact echo in concrete component
p, calculated prestressing force pipeline impact echo touches the t reflection interval end
ithe t reflection interval end is touched with impact echo in concrete component
pratio t, with ratio t for horizontal ordinate, grouting saturation degree f is ordinate, and ratio t and grouting saturation degree f are carried out linear fit and obtain formula.Be below the computation model of the pumping of prostressed duct plumpness of several different pipeline:
(1) prestressed plastic pipeline, pipe diameter 55mm, the computation model of pumping of prostressed duct plumpness is f=-7.5236t+9.9941, during wherein K=-7.5236, b=9.9941, f >=100%, gets f=100%; During f≤0%, get f=0%, as shown in Figure 6 a, its relevant parameter value is as shown in table 6a.
Table 6a
(2) prestressed plastic pipeline, pipe diameter 80mm, the computation model of pumping of prostressed duct plumpness is f=-4.9834t+6.7957, during wherein K=-4.9834, b=6.7957, f >=100%, gets f=100%; During f≤0%, get f=0%, as shown in Figure 6 b, its relevant parameter value is as shown in table 6b.
Table 6b
(3) prestressed plastic pipeline, pipe diameter 100mm, the computation model of pumping of prostressed duct plumpness is f=-2.5194t+3.5887, during wherein K=-2.5194, b=3.5887, f >=100%, gets f=100%; During f≤0%, get f=0%, as fig. 6 c, its relevant parameter value is as shown in table 6c.
Table 6c
Step 206, according to the mud jacking plumpness of each measuring point of computation model difference calculated prestressing force pipeline of the pumping of prostressed duct plumpness of different pipeline.
Step 207, by the mud jacking plumpness situation line of each measuring point, forms the mud jacking situation of whole pipeline.Mud jacking plumpness situation for adjacent two measuring points differs by more than appointment ratio, and (this appointment ratio is 10% ~ 15%, in present pre-ferred embodiments, specify ratio be 10%) situation, measuring point number is increased between two measuring points, the spacing of measuring point can be 2 ~ 5cm, then line reflects the mud jacking situation of this part pipeline.
Below will further illustrate the present invention by several specific embodiment.
Embodiment 1:
1) component length is 1m, component thickness 43cm, inside sets diameter as the plastic film capicitor of 55mm, determines the position of deformed bar according to step 201.
2) survey line 1 and measuring point is arranged according to step 202, survey line 1 is arranged in distance 0.15m position, concrete component edge, measuring point spacing 0.1m, arrange survey line 2 and measuring point, survey line 2 is arranged in the upper surface of concrete component corresponding to the axis of prestress pipe, measuring point spacing 0.1m, as shown in Figure 7a, each point layout of survey line 2 as shown in Figure 7b for each point layout of survey line 1.
3) according to step 203, select excited frequency to be the steel hammer of 9.690khz, the impact echo measuring 11 measuring points in survey line 1 touches the reflection interval end, as shown in table 7.(the t reflection interval end is touched by each measuring point impact echo of survey line 1
pi), calculate the tactile average reflection end, (t time of impact echo
p), t
p=0.254ms.
On table 7 survey line 1, the impact echo of each measuring point touches the reflection interval end
| Measuring point numbering i | Each measuring point impact echo touches the reflection end, t moment pi(unit: ms) |
| 1 | 0.256 |
| 2 | 0.254 |
| 3 | 0.254 |
| 4 | 0.257 |
| 5 | 0.255 |
| 6 | 0.255 |
| 7 | 0.258 |
| 8 | 0.253 |
| 9 | 0.251 |
| 10 | 0.251 |
| 11 | 0.254 |
4) according to step 204, select excited frequency to be the steel hammer of 9.690khz, the impact echo measuring 11 measuring points in survey line 2 touches the reflection interval end, as shown in table 8.
On table 8 survey line 2, the impact echo of each measuring point touches the reflection moment end
| Measuring point numbering i | Each measuring point impact echo touches the reflection end, t moment i(unit: ms) |
| 1 | 0.312 |
| 2 | 0.313 |
| 3 | 0.308 |
| 4 | 0.307 |
| 5 | 0.307 |
| 6 | 0.305 |
| 7 | 0.306 |
| 8 | 0.305 |
| 9 | 0.304 |
| 10 | 0.304 |
| 11 | 0.306 |
5) (the t reflection interval end is touched by each measuring point impact echo of survey line 2
i), and the tactile average reflection end, (t time of impact echo
p), according to the calibration formula stored in storer, when being f=-7.5236t+9.9941, f>=100% by the computation model of step 205 pumping of prostressed duct plumpness, get f=100%; During f≤0%, get f=0%.In calculation procedure 206, the mud jacking plumpness situation of each measuring point of prestress pipe, as shown in table 9.
The mud jacking plumpness situation of each measuring point of table 9 prestress pipe
| Measuring point numbering i | Each measuring point mud jacking plumpness situation f |
| 1 | 75％ |
| 2 | 72％ |
| 3 | 87％ |
| 4 | 90％ |
| 5 | 90％ |
| 6 | 96％ |
| 7 | 93％ |
| 8 | 96％ |
| 9 | 99％ |
| 10 | 99％ |
| 11 | 93％ |
6) except 2,3 measuring points, the mud jacking plumpness difference of all the other adjacent two measuring points is less than or equal to specifies ratio (10% ~ 15%, in the present embodiment, ratio is specified to be 10%), therefore between 2,3 measuring points, set up 1 measuring point be designated as measuring point 12, repeat step 204 ~ 206, as calculated the mud jacking plumpness situation f=80% of measuring point 12, the mud jacking plumpness situation of each measuring point is averaged.
According to step 207, line forms the mud jacking situation of whole pipeline, as shown in Figure 7 c.
Hole on prestress pipe with reciprocating drill, verify the pumping of prostressed duct plumpness situation of each measuring point, as shown in table 10, the measuring error of pumping of prostressed duct plumpness is better than 5%.
The measuring error of the mud jacking plumpness of each measuring point of table 10 prestress pipe
Embodiment 2:
1) component length is 1m, component thickness 86cm, inside sets diameter as the plastic film capicitor of 80mm, determines the position of deformed bar by step 201.
2) survey line 1 and measuring point is arranged according to step 202, survey line 1 is arranged in distance 0.15m position, concrete component edge, measuring point spacing 0.1m, arrange survey line 2 and measuring point, survey line 2 is arranged in the upper surface of concrete component corresponding to the axis of prestress pipe, measuring point spacing 0.1m, as shown in Figure 8 a, each point layout of survey line 2 as shown in Figure 8 b for each point layout of survey line 1.
3) according to step 203, select excited frequency to be the steel hammer of 5.814khz, the impact echo measuring 11 measuring points in survey line 1 touches the reflection interval end, as shown in table 11.(the t reflection interval end is touched by each measuring point impact echo of survey line 1
pi), calculate the tactile average reflection end, (t time of impact echo
p), t
p=0.449ms.
On table 11 survey line 1, the impact echo of each measuring point touches the reflection interval end
| Measuring point numbering i | Each measuring point impact echo touches the reflection end, t moment pi(unit: ms) |
| 1 | 0.451 |
| 2 | 0.450 |
| 3 | 0.450 |
| 4 | 0.449 |
| 5 | 0.448 |
| 6 | 0.450 |
| 7 | 0.449 |
| 8 | 0.449 |
| 9 | 0.447 |
| 10 | 0.448 |
| 11 | 0.449 |
4) according to step 204, select excited frequency to be the steel hammer of 5.814khz, the impact echo measuring 11 measuring points in survey line 2 touches the reflection interval end, as shown in table 12.
On table 12 survey line 2, the impact echo of each measuring point touches the reflection moment end
| Measuring point numbering i | Each measuring point impact echo touches the reflection end, t moment i(unit: ms) |
| 1 | 0.532 |
| 2 | 0.536 |
| 3 | 0.538 |
| 4 | 0.541 |
| 5 | 0.543 |
| 6 | 0.545 |
| 7 | 0.544 |
| 8 | 0.540 |
| 9 | 0.536 |
| 10 | 0.532 |
| 11 | 0.530 |
5) (the t reflection interval end is touched by each measuring point impact echo of survey line 2
i), and the tactile average reflection end, (t time of impact echo
p), store calibration formula according in storer, when being f=-4.9834t+6.7957, f>=100% by the computation model of step 205 pumping of prostressed duct plumpness, get f=100%; During f≤0%, get f=0%.In calculation procedure 206, the mud jacking plumpness situation of each measuring point of prestress pipe, as shown in table 13.
The mud jacking plumpness situation of each measuring point of table 13 prestress pipe
| Measuring point numbering i | Each measuring point mud jacking plumpness situation f |
| 1 | 89％ |
| 2 | 85％ |
| 3 | 82％ |
| 4 | 79％ |
| 5 | 77％ |
| 6 | 75％ |
| 7 | 76％ |
| 8 | 80％ |
| 9 | 85％ |
| 10 | 89％ |
| 11 | 91％ |
6) the mud jacking plumpness difference of adjacent two measuring points is less than or equal to appointment ratio (10% ~ 15%, in the present embodiment, ratio is specified to be 10%), according to step 207, the mud jacking plumpness situation of each measuring point is averaged, therefore line forms the mud jacking situation of whole pipeline, as shown in Figure 8 c.
Hole on prestress pipe with reciprocating drill, verify the pumping of prostressed duct plumpness situation of each measuring point, as shown in table 14, the measuring error of pumping of prostressed duct plumpness is better than 5%.
The measuring error of the mud jacking plumpness of each measuring point of table 14 prestress pipe
Embodiment 3:
1) component length is 1m, component thickness 28cm, inside sets diameter as the plastic film capicitor of 100mm, determines the position of deformed bar by step 201.
2) survey line 1 and measuring point is arranged according to step 202, survey line 1 is arranged in distance 0.2m position, concrete component edge, measuring point spacing 0.1m, arrange survey line 2 and measuring point, survey line 2 is arranged in the upper surface of concrete component corresponding to the axis of prestress pipe, measuring point spacing 0.1m, as illustrated in fig. 9, each point layout of survey line 2 as shown in figure 9b for each point layout of survey line 1.
3) according to step 203, select excited frequency to be the steel hammer of 17.100khz, the impact echo measuring 11 measuring points in survey line 1 touches the reflection interval end, as shown in Table 15.(the t reflection interval end is touched by each measuring point impact echo of survey line 1
pi), calculate the tactile average reflection end, (t time of impact echo
p), tp=0.148ms.
On table 15 survey line 1, the impact echo of each measuring point touches the reflection interval end
| Measuring point numbering i | Each measuring point impact echo touches the reflection end, t moment pi(unit: ms) |
| 1 | 0.150 |
| 2 | 0.145 |
| 3 | 0.152 |
| 4 | 0.149 |
| 5 | 0.141 |
| 6 | 0.146 |
| 7 | 0.155 |
| 8 | 0.154 |
| 9 | 0.146 |
| 10 | 0.146 |
| 11 | 0.148 |
4) according to step 204, select excited frequency to be the steel hammer of 17.100khz, the impact echo measuring 11 measuring points in survey line 2 touches the reflection interval end, shown in table 16.
On table 16 survey line 2, the impact echo of each measuring point touches the reflection moment end
| Measuring point numbering i | Each measuring point impact echo touches the reflection end, t moment i(unit: ms) |
| 1 | 0.153 |
| 2 | 0.156 |
| 3 | 0.155 |
| 4 | 0.157 |
| 5 | 0.156 |
| 6 | 0.152 |
| 7 | 0.157 |
| 8 | 0.156 |
| 9 | 0.155 |
| 10 | 0.154 |
| 11 | 0.155 |
5) (the t reflection interval end is touched by each measuring point impact echo of survey line 2
i), and the tactile average reflection end, (t time of impact echo
p), store calibration formula according in storer, when being f=-2.5194t+3.5887, f>=100% by the computation model of step 205 pumping of prostressed duct plumpness, get f=100%; During f≤0%, get f=0%.In calculation procedure 206, the mud jacking plumpness situation of each measuring point of prestress pipe, shown in table 17.
The mud jacking plumpness situation of each measuring point of table 17 prestress pipe
| Measuring point numbering i | Each measuring point mud jacking plumpness situation f |
| 1 | 100％ |
| 2 | 93％ |
| 3 | 95％ |
| 4 | 92％ |
| 5 | 93％ |
| 6 | 100％ |
| 7 | 92％ |
| 8 | 93％ |
| 9 | 95％ |
| 10 | 97％ |
| 11 | 95％ |
6) the mud jacking plumpness difference of adjacent two measuring points is less than or equal to (10% ~ 15%, in the present embodiment, specify ratio to be 10%), according to step 207, the mud jacking plumpness situation of each measuring point is averaged, therefore line forms the mud jacking situation of whole pipeline, as is shown in fig. 9 c
Hole on prestress pipe with reciprocating drill, verify the pumping of prostressed duct plumpness situation of each measuring point, shown in table 18, the measuring error of pumping of prostressed duct plumpness is better than 5%.
The measuring error of the mud jacking plumpness of each measuring point of table 18 prestress pipe
In sum, the quantitative testing device of a kind of pumping of prostressed duct plumpness of the present invention situation and method touch the relational model of the reflection interval end by the mud jacking plumpness and impact echo setting up prestress pipe, the mud jacking plumpness of quantitative measurement prestress pipe, solve Impact echo in prior art and can only complete the qualitative judgement of defect, problem that test result reliability is low, make the relative error <5% that pumping of prostressed duct plumpness is measured.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any those skilled in the art all without prejudice under spirit of the present invention and category, can carry out modifying to above-described embodiment and change.Therefore, the scope of the present invention, should listed by claims.
Claims (10)
1. the quantitative testing device of a pumping of prostressed duct plumpness situation, it is characterized in that: described quantitative testing device comprises radiating circuit, low frequency stress pulse energizer, signal amplifier, low frequency stress pulse receiver, programmable filter, charge amplifier, A/D converter, data acquisition unit, data buffer, dsp processor, storer and CPU, described low frequency stress pulse energizer is placed in surface of concrete structure near described low frequency stress pulse receiver, described low frequency stress pulse receiver is placed on the measuring point of concrete component, the signal output part of described CPU connects the input end of described radiating circuit, the output terminal of the radiating circuit of described low frequency stress pulse energizer produces the stress wave of low frequency, return through component bottom reflection after stress wave propagation to xoncrete structure inside, the input end that reflection wave is placed in the described low frequency stress pulse receiver on the measuring point of concrete component through described signal amplifier accepts, the signal output part of described low frequency stress pulse receiver by low frequency stress ripple through described programmable filter, described charge amplifier and described A/D converter are sent to described data acquisition unit, the signal collected is sent in described data buffer by described data acquisition unit, the steering order that electric signal in data-carrier store sends according to described CPU is carried out signal transacting by described dsp processor, the calibration formula stored in the signal data that described CPU completes according to described dsp processor process and described storer, calculate the mud jacking plumpness of pipeline.
2. the quantitative testing device of a kind of pumping of prostressed duct plumpness situation as claimed in claim 1, it is characterized in that: described quantitative testing device also comprises operation keyboard and display, described operation keyboard is used for external data input, and described display is used for the sweep waveform of display low frequency stress ripple and the test result of pumping of prostressed duct plumpness in real time.
3. a quantitative detecting method for pumping of prostressed duct plumpness situation, comprises the steps:
Step one, utilizes high-frequency electromagnetic wave excitation device and receiving trap to launch frequency electromagnetic waves to concrete component, is received the electromagnetic wave reflected by signal receiver, according to position and the trend of the electromagnetic wave signal determination deformed bar received;
Step 2, concrete component upper surface along deformed bar move towards arrange concrete component survey line 1 and prestress pipe survey line 2 and point position;
Step 3, measures impact echo in concrete component and touches the average reflection end, t time
p;
Step 4, measures impact echo in prestress pipe and touches the t reflection interval end
i;
Step 5, touches the average reflection end, t time according to impact echo in described concrete component
pthe t reflection interval end is touched with impact echo in described prestress pipe
i, measure prestress pipe under the condition of difference grouting situation in described prestress pipe impact echo touch the t reflection interval end
ithe average reflection end, t time is touched with impact echo in described concrete component
pratio and the corresponding relation of mud jacking plumpness, the computation model of pumping of prostressed duct plumpness is obtained by calibration result, the computation model of described pumping of prostressed duct plumpness is f=Kt+b, wherein, f is the mud jacking plumpness of prestress pipe, K is time coefficient, and t is that prestress pipe impact echo touches the t reflection interval end
ithe average reflection end, t time is touched with impact echo in concrete component
pratio, b is relation constant.
Step 6, gather survey impact echo in the concrete component of each measuring point of prestress pipe and touch the average reflection end, t time
pthe t reflection interval end is touched with impact echo in prestress pipe
i, according to the computation model of pumping of prostressed duct plumpness, calculate the mud jacking plumpness situation of each measuring point;
Step 7, by the mud jacking plumpness situation line of each measuring point, forms the mud jacking situation of whole pipeline.
4. the quantitative detecting method of a kind of pumping of prostressed duct plumpness situation as claimed in claim 3, it is characterized in that: in step 7, if the mud jacking plumpness situation of adjacent two measuring points differs by more than appointment ratio, between two measuring points, increase measuring point number, then line reflects the mud jacking situation of this part pipeline.
5. the quantitative detecting method of a kind of pumping of prostressed duct plumpness situation as claimed in claim 3, it is characterized in that, described step one comprises the steps:
(1) emitting antenna of ground penetrating radar is utilized to launch frequency electromagnetic waves to underground, the electromagnetic wave being reflected back ground is received by receiving antenna, reflect when running into the interface that there is electrical property difference when electromagnetic wave is propagated in underground medium, according to the locus and the buried depth that receive electromagnetic waveform, oscillator intensity and the variation characteristic of time and infer deformed bar in bridge structure, to mark mark at concrete surface;
(2) mark mark is linked to be line, determines the position of deformed bar.
6. the quantitative detecting method of a kind of pumping of prostressed duct plumpness situation as claimed in claim 3, it is characterized in that: in step 2, along deformed bar trend distance Member Lip 10 ~ 20cm place, do not have the concrete component upper surface of prestress pipe to arrange survey line 1, or the concrete component upper surface corresponding in centre position, two prestress pipe axis arrange survey line 1; Along the trend of deformed bar at the location arrangements survey line 2 of the corresponding prestress pipe of concrete component upper surface, survey line 1 and 2 evenly arranges measuring point.
7. the quantitative detecting method of a kind of pumping of prostressed duct plumpness situation as claimed in claim 6, it is characterized in that: in step 3, take concrete component as determination object, in described concrete component, the measuring point place of impact echo survey line 1 arranges low frequency stress pulse excitation device and low frequency stress reception of impulse device, when low frequency stress reception of impulse device receives resonance wave signal, record is demarcated impact echo in described concrete component and is touched the t reflection interval end
pi, move described low frequency stress pulse excitation device and described low frequency stress reception of impulse device along impact echo survey line 1 in described concrete component, the echo measuring each measuring point place touches the t reflection interval end simultaneously
piand calculate its mean value, be designated as impact echo in concrete component and touch the average reflection end, t time
p.
8. the quantitative detecting method of a kind of pumping of prostressed duct plumpness situation as claimed in claim 7, it is characterized in that: in step 4, take prestress pipe as determination object, in described prestress pipe, low frequency stress pulse excitation device and low frequency stress reception of impulse device are installed by the measuring point place of impact echo survey line 2, produce the stress wave of low frequency, returned by component bottom reflection after propagating into inside configuration, stress wave roundtrip between the border of component end face, pipe interior, component bottom surface produces transient state resonance, and impact echo to be obtained touches the t reflection interval end
i, move described low frequency stress pulse excitation device and described low frequency stress reception of impulse device along impact echo survey line 2 in described prestress pipe simultaneously, measure the t at each measuring point place
ivalue.
9. the quantitative detecting method of a kind of pumping of prostressed duct plumpness situation as claimed in claim 3, it is characterized in that, in step 5, the defining method of the computation model of described pumping of prostressed duct plumpness is: set pumping of prostressed duct plumpness as not being in the milk, 50% grouting, 100% grouting, measure impact echo in described prestress pipe and touch the t reflection interval end
ithe average reflection end, t time is touched with impact echo in concrete component
p; Calculated prestressing force pipeline impact echo touches the t reflection interval end
ithe average reflection end, t time is touched with impact echo in concrete component
pratio t; With ratio t for horizontal ordinate, grouting saturation degree f is ordinate, ratio t and grouting saturation degree f is carried out the computation model that linear fit obtains described pumping of prostressed duct plumpness, wherein, when f>=100%, gets f=100%; When f≤0%, get f=0%.
10. the quantitative detecting method of a kind of pumping of prostressed duct plumpness situation as claimed in claim 8, it is characterized in that: described in step 3 and step 4, low frequency stress pulse excitation device is steel hammer, adopt single-point type Impact echo, the selection of the excited frequency of described steel hammer is relevant with the thickness of concrete component.
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