CN105136907A - Plane testing method based grouting compactness intelligent detection system and method - Google Patents

Abstract

The present invention discloses a plane testing method based grouting compactness intelligent detection system and method, and the method is as follows: artificially arranging five compactness levels of corrugated pipe tunnels; building a void estimation model, deducing a mathematical relationship formula between reflected wave first wave sound time and diffracted wave first wave sound time and void inner diameter theoretical values; calibrating impact echo wave velocity; labeling measuring points along the corrugated pipe direction in intervals of a set distance; applying a set amount of coupling agent evenly to the positions of the measuring points; collecting field data by plane testing method, and deducing and calculating a void inner diameter true value according to the reflected wave first wave sound time and the diffracted wave first wave sound time obtained by field detection and the built void estimation model. The method can be used for accurate - non-destructive testing of corrugated pipe grouting compactness, is simple and fast in testing process, high in testing precision, and capable of being promote in large scale, and can effectively control corrugated pipe tunnel grouting quality problems in the construction process.

Description

A kind of mud jacking density intelligent checking system based on flat survey method and method

Technical field

The present invention relates to the nondestructive evaluation detection technique field of mainly corrugated tube hole path pressure grouting density, particularly relate to a kind of mud jacking density intelligent checking system based on flat survey method and method.

Background technology

Along with the progress of society, the development of science and technology, traffic, as the key point of economic development, obtains and rapidly spends development, and highway, bridge cause also enter the high-speed developing period.China is vast in territory, and geological type is complicated and changeable, and therefore dissimilar science of bridge building emerges in large numbers one after another, particularly cause global steel in short supply after World War II, cause prestressed structure to be widely used in bridge construction, in recent years, China's newly building bridge more than 95% all belongs to Prestressed Concrete Bridges.And prestress corrugated tube is as the of paramount importance ingredient of prestress system, the height of its grouting quality directly affects the reliability of prestressed structure.Metal material is under high-stress state, and corrosion degree is far above unstress state, and corrosion also can more easily occur steel strand wires, and even rust is disconnected, and this will have a strong impact on the normal work of prestressed structure.Now research shows, corrugated tube hole path pressure grouting leakiness reason is complicated and diversified, and hole path pressure grouting is as a kind of concealed work, construction quality is difficult to effectively judge, how to carry out to corrugated tube compaction rate the difficult problem that Non-Destructive Testing becomes puzzlement domestic and international project circle.

For the series of problems that corrugated tube hole path pressure grouting density deficiency is brought bridge structure.The detection method adopted both at home and abroad is:

(1) core-drilling method: core boring sampling method be utilize hollow thin-wall drill bit machinery, in certain sampling observation ratio from xoncrete structure core boring sampling to detect a kind of method of defect in concrete.The method is intuitive and reliable, but can cause certain damage to structure, and workload is large, efficiency is low, costly.Therefore, should not large-area use core boring sampling method detect, general only after noting abnormalities with nondestructive determination, just use the method further to confirm to judge.

(2) wave velocity method: wave velocity method (Impact-echoMethod), namely use mechanical transient batting measured object surface measuring point to produce instantaneous stress ripple, then analyze a kind of method of stress wave in inside configuration different surface reflections diffraction rule.Contain compressional wave P ripple, shear wave S ripple, surface wave R ripple stress wave inside configuration propagate (wherein R ripple is propagated at body surface, P ripple and S ripple are propagated at interior of articles), when run into defect in concrete or interfacial time will reflect, when reflection wave turns back to body surface, just create displacement, this displacement is received by sensor, obtain the time-domain signal of echo, become frequency-region signal through Fast Fourier Transform (FFT) again, the position of pipeline and the density of mud jacking thereof can be judged according to the dominant frequency of frequency-region signal.

(3) ground penetrating radar method: ground penetrating radar method also claims geological radar method, its principle of work is sent out the high-frequency impulse electromagnetic wave of more than 1GHz, return after the objective body of electromagnetic wave through there is relative dielectric constant difference or boundary reflection and received by antenna, by the analysis to close echo signal, form and the structure of target just can be judged.

The enforcement of above-mentioned detection method is all confined to many-sided reasons such as environmental factor, accuracy of detection, operating process, cannot carry out large scale application, domestic not yet have the lossless detection method of any one maturation to carry out accurate quantification assessment to corrugated tube hole path pressure grouting density.

Summary of the invention

Object of the present invention is exactly to solve the problem, and provides a kind of mud jacking density intelligent checking system based on flat survey method and method.This system and method, mainly for the corrugated tube duct being in box girder web, T Liang Leibanchu, adopts flat survey method to detect, not only increases engineering practicability, and can carry out accurate quantification assessment to its mud jacking density.

To achieve these goals, the present invention adopts following technical scheme:

Based on a mud jacking density intelligent checking system for flat survey method, comprising:

Concrete sample arranges corrugated tube duct that packing is respectively a, b, c, d, e five packing grades respectively; On concrete sample, setting position is installed signal projector and is signal receiver.

Signal projector and signal receiver are arranged on the same side of concrete sample, and the signal projector in concrete slab the same side and signal receiver distributing position must in corrugated tube positions along the line.

Based on a mud jacking density intelligent detecting method for flat survey method, comprise the following steps:

(1) set up full-scale model test, the corrugated tube duct that packing is respectively a, b, c, d, e five packing grades is artificially set;

(2) according to during impact echo reflection wave Mintrop wave sound and diffracted wave Mintrop wave sound time two groups of data, set up empty appraising model, T when deriving reflection wave Mintrop wave sound ₁with T during diffracted wave Mintrop wave sound ₂and empty internal diameter theoretical value R _tbetween relationship;

(3) adopt concrete standard test block that is identical with strength of concrete specimen, the making same period, carry out the demarcation of impact echo velocity of wave v;

(4) at the tested portion faces of concrete sample, corresponding corrugated tube burial place cloth dotted line, and carry out measuring point mark along interval, corrugated tube direction setpoint distance;

(5) grinding process is carried out to operation surface and the uniform coupling agent of set amount is spread upon point position place;

(6) adopt flat survey method to carry out on-site data gathering, each measuring point gathers repeatedly data;

(7) during the reflection wave Mintrop wave sound obtained according to Site Detection and diffracted wave Mintrop wave sound time and the empty appraising model of foundation, derive and calculate empty internal diameter true value size.

Described full-scale model test comprises:

Concrete sample arranges corrugated tube duct that packing is respectively a, b, c, d, e five packing grades respectively; On concrete sample, setting position is installed signal projector and is signal receiver.

Signal projector in concrete slab the same side and signal receiver distributing position must in corrugated tube positions along the line.

Described empty appraising model is specially:

Signal generator R and signal receiver T is arranged on same one end of corrugated tube, and I is the point midway of signal generator R and signal receiver T; Signal generator R launching shock echo, in position, corrugated tube face, H place launches, and is then received by signal receiver T; Meanwhile, when by corrugated tube, there is diffraction phenomenon in impact echo, impact echo and the upper and lower two ends of corrugated tube contact point is respectively B, C and F, E, M, N is respectively circle corrugated pipe uppermost position in fig-ure point and lowermost position is put a little; Bellows Length between some B, M 2 is called bellows Length between some M, C 2 is called diffracted signal contacts at a D with the corrugated tube other end.

By setting up empty appraising model, according to the theoretical value R that can extrapolate empty radius during reflection wave Mintrop wave sound _tt during Mintrop wave sound theoretical with diffracted wave _2t, determine in measured data diffracted wave actual measurement Mintrop wave sound time T ₂, relation during analysis diffracted wave Mintrop wave sound between theoretical value and measured value, obtains one about the check coefficient between measured value and theoretical value namely according to this check coefficient and empty radius theoretical value R _t, the size of empty radius measured value R can be extrapolated.

Cavity internal diameter theoretical value R _tt during Mintrop wave sound theoretical with diffracted wave _2tdeterministic process as follows:

1) try to achieve according to known conditions: $L_{TH}=\frac{T_1\×v}{2};L_{TI}=\frac{D_{TR}}{2};L_{IO}=\frac{L}{2};$

2) with Δ TOI for research object, carry out key distance and angle solve: $\∠TOI=\arccos \left(\frac{{L_{HO}}^2+{L_{TO}}^2-{L_{TH}}^2}{2\×L_{HO}\×L_{TO}}\right);$

3) with Δ TBO for research object, carry out key distance and angle solve: by can try to achieve $\∠TOB=\arccos \frac{R_t}{\[\sqrt{\frac{{\left({\mathrm{vT}}_1\right)}^2}{4}+2R_t\sqrt{\frac{{\left({\mathrm{vT}}_1\right)}^2}{4}-\frac{{D_{TR}}^2}{4}+{R_t}^2}}\]};$

4) with Δ COD for research object, carry out key distance and angle solve: $arccos(\∠COD)=\frac{{L_{OC}}^2+{L_{OD}}^2-{L_{CD}}^2}{2\×L_{OC}\×L_{OD}};$

5) according to diffraction curve path analysis:

Wherein, L _tHfor TH spacing; T ₁during for reflection wave Mintrop wave sound; V is the velocity of propagation of impact echo in concrete; L _tIfor TI spacing; D _tRfor signal receiver T signal generator R distance between the two; L _iOfor IO spacing; L is concrete slab thickness.

The invention has the beneficial effects as follows:

The present invention can carry out accurately-Non-Destructive Testing to corrugated tube hole path pressure grouting density, and testing process is easy, quick, and accuracy of detection is high, can spread, effectively can control ripple pore road squeezing quality problem in work progress.

The inventive method, mainly for the corrugated tube duct being in box girder web, T Liang Leibanchu, adopts flat survey method to detect, not only increases engineering practicability, and can carry out accurate quantification assessment to its mud jacking density.

Accompanying drawing explanation

Fig. 1 is test model schematic diagram of the present invention;

Fig. 2 is the present invention cavity appraising model schematic diagram;

Fig. 3 is cosine law schematic diagram.

Wherein, 1 is corrugated tube duct, and 2 is signal projector, and 3 is signal receiver, and 4 is concrete sample.

Embodiment:

Below in conjunction with accompanying drawing and embodiment, the present invention will be further described:

The ultimate principle that the present invention adopts is impact echo principle, impact echo is as a kind of elastic wave, it has possessed whole attributes of sound wave, in concrete medium communication process, shock wave can produce reflection, scattering phenomenon, and when therefore impact echo is again by different defect level empty, travel path has comparatively significantly difference, signal, that is: T during reflection wave Mintrop wave sound when adopting flat survey method to obtain different sound ₁with T during diffracted wave Mintrop wave sound ₂.By setting up empty appraising model, deriving empty internal diameter theoretical value and checking COEFFICIENT K, thus determining the true value R of empty internal diameter.

Based on a mud jacking density intelligent checking system for flat survey method, comprising:

Concrete sample arranges corrugated tube duct that packing is respectively a, b, c, d, e five packing grades respectively; On concrete sample, setting position is installed signal projector and is signal receiver.

Signal projector and signal receiver are arranged on the same side of concrete sample, and the signal projector in concrete slab the same side and signal receiver distributing position must in corrugated tube positions along the line.

Based on a mud jacking density intelligent detecting method for flat survey method, comprise the following steps:

1, set up full-scale model test, as shown in Figure 1, concrete sample 4 artificially arranges the corrugated tube duct 1 of closely knit, 3/4 closely knit, 1/2 closely knit, 1/4 closely knit and complete empty five grades entirely respectively; ; On concrete sample 4, setting position is installed signal projector 2 and is signal receiver 3.Must in corrugated tube position along the line with signal receiver 3 distributing position at the signal projector 2 of concrete slab the same side.

2, empty appraising model is set up, T when deriving reflection wave Mintrop wave sound ₁with T during diffracted wave Mintrop wave sound ₂and empty internal diameter theoretical value R _tbetween relationship;

3, adopt the concrete standard test block made, same period identical with concrete sample semi-finals degree, carry out the demarcation of impact echo velocity of wave v;

4, at the tested portion faces of concrete sample 4, corresponding corrugated tube burial place cloth dotted line, and longitudinally equidistant 1cm marks, and amounts to 11 measuring points;

5, sander or sand paper is adopted operation surface to be carried out grinding process and a certain amount of uniform coupling agent is spread upon point position place;

6, on-site data gathering, adopt flat survey method to collect data, each measuring point gathers three secondary data;

Flat survey method is signal projector 2 with receiver in concrete slab the same side, signal projector 2 is had to transmit, impact echo is propagated in concrete slab, through corrugated tube duct 1, arrive at concrete slab to side, then signal receiver 3 position is reflected back, by signal receiver 3 Received signal strength, travel path as shown in Figure 2, sensor mounting location as shown in Figure 1, must in corrugated tube position along the line with signal receiver 3 distributing position at the signal projector 2 of concrete slab the same side, its transversal section is as shown in Figure 2.

7, by Site Detection obtain reflection wave Mintrop wave sound time and diffracted wave Mintrop wave sound time with empty appraising model simultaneous, derivation calculate empty internal diameter true value size.

The present invention using impact echo principle as theoretical foundation, that is: T=1/f=D/V; In formula: V---the velocity of propagation of ultrasound wave in concrete; D---travel path; T---during Mintrop wave sound; F---the resonant frequency of ripple is obtained by Fourier transform.

By during empty appraising model derivation Mintrop wave sound and empty internal diameter correlativity time, the present invention using the cosine law as calculating theoretical foundation.The cosine law is the mathematical theorem describing three edge lengths and a cosine of an angle value relation in triangle, and in Δ ABC (as Fig. 3), the cosine law can be expressed as:

c ²＝a ²+b ²-2abcos(γ)

b ²＝c ²+a ²-2accos(β)

a ²＝b ²+c ²-2bccos(α)

Corresponding line segment length in a, b, c representative graph 3.

The present invention considers that empty appraising model cavity internal diameter is only when being greater than TR Distance Between Transducers, just there is similar reflection paths, in Practical Project testing process, corrugated tube cavity internal diameter is less than in 1mm situation negligible for the impact of corrugated tube working stress, and the situation that therefore empty internal diameter is less than 1mm will not considered.

In Site Detection process, according to during impact echo reflection wave Mintrop wave sound and diffracted wave Mintrop wave sound time two groups of data, set up empty appraising model, thus derive corrugated tube cavity internal diameter true value size.

In the present invention, set up empty appraising model (as Fig. 2) based on flat survey method, T during acquisition reflection wave Mintrop wave sound ₁with T during diffracted wave Mintrop wave sound ₂and empty internal diameter theoretical value R _tbetween the formula of relation, its derivation following steps:

1) can be in the hope of according to known conditions $L_{TH}=\frac{T_1\×v}{2};L_{TI}=\frac{D_{TR}}{2};L_{IO}=\frac{L}{2};$

2) with Δ TOI for research object, carry out key distance and angle solve: $\∠TOI=\arccos \left(\frac{{L_{HO}}^2+{L_{TO}}^2-{L_{TH}}^2}{2\×L_{HO}\×L_{TO}}\right);$

3) with Δ TBO for research object, carry out key distance and angle solve: by can try to achieve $\∠TOB=\arccos \frac{R_t}{\[\sqrt{\frac{{\left({\mathrm{vT}}_1\right)}^2}{4}+2R_t\sqrt{\frac{{\left({\mathrm{vT}}_1\right)}^2}{4}-\frac{{D_{TR}}^2}{4}+{R_t}^2}}\]};$

4) with Δ COD for research object, carry out key distance and angle solve: $arccos(\∠COD)=\frac{{L_{OC}}^2+{L_{OD}}^2-{L_{CD}}^2}{2\×L_{OC}\×L_{OD}};$

5) according to diffraction curve path analysis:

when solving, it is emphasized that inside diameter of bel is known, the circular radius namely in accompanying drawing 2 is known.Because ∠ is MOD=90, ∠ MOC=∠ MOD-∠ COD, ∠ BOM=180-∠ TOB-∠ MOC-∠ COD, carries out in two arc solution procedurees, when two angles are known, by arc length formula,

By setting up empty appraising model, according to the theoretical value R that can extrapolate empty radius during reflection wave Mintrop wave sound _tt during Mintrop wave sound theoretical with diffracted wave _2t, determine in measured data diffracted wave actual measurement Mintrop wave sound time T ₂, relation during analysis diffracted wave Mintrop wave sound between theoretical value and measured value, obtains one about the check coefficient between measured value and theoretical value namely according to this check coefficient and empty radius theoretical value R _t, the size of empty radius measured value R can be extrapolated.

By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection scope of the present invention.

Claims (8)

1., based on a mud jacking density intelligent checking system for flat survey method, it is characterized in that, comprising:

Concrete sample arranges corrugated tube duct that packing is respectively a, b, c, d, e five packing grades respectively; On concrete sample, setting position is installed signal projector and is signal receiver.

2. a kind of mud jacking density intelligent checking system based on flat survey method as claimed in claim 1, it is characterized in that, signal projector and signal receiver are arranged on the same side of concrete sample, and the signal projector in concrete slab the same side and signal receiver distributing position must in corrugated tube positions along the line.

3., based on a mud jacking density intelligent detecting method for flat survey method, it is characterized in that, comprise the following steps:

(1) set up full-scale model test, the corrugated tube duct that packing is respectively a, b, c, d, e five packing grades is artificially set;

(2) according to during impact echo reflection wave Mintrop wave sound and diffracted wave Mintrop wave sound time two groups of data, set up empty appraising model, T when deriving reflection wave Mintrop wave sound ₁with T during diffracted wave Mintrop wave sound ₂and empty internal diameter theoretical value R _tbetween relationship;

(3) adopt concrete standard test block that is identical with strength of concrete specimen, the making same period, carry out the demarcation of impact echo velocity of wave v;

(4) at the tested portion faces of concrete sample, corresponding corrugated tube burial place cloth dotted line, and carry out measuring point mark along interval, corrugated tube direction setpoint distance;

(5) grinding process is carried out to operation surface and the uniform coupling agent of set amount is spread upon point position place;

(6) adopt flat survey method to carry out on-site data gathering, each measuring point gathers repeatedly data;

(7) during the reflection wave Mintrop wave sound obtained according to Site Detection and diffracted wave Mintrop wave sound time and the empty appraising model of foundation, derive and calculate empty internal diameter true value size.

4. a kind of mud jacking density intelligent detecting method based on flat survey method as claimed in claim 3, it is characterized in that, described full-scale model test comprises:

Concrete sample arranges corrugated tube duct that packing is respectively a, b, c, d, e five packing grades respectively; On concrete sample, setting position is installed signal projector and is signal receiver.

5. a kind of mud jacking density intelligent detecting method based on flat survey method as claimed in claim 4, it is characterized in that, the signal projector in concrete slab the same side and signal receiver distributing position must in corrugated tube positions along the line.

6. a kind of mud jacking density intelligent detecting method based on flat survey method as claimed in claim 3, it is characterized in that, described empty appraising model is specially:

Signal generator R and signal receiver T is arranged on same one end of corrugated tube, and I is the point midway of signal generator R and signal receiver T; Signal generator R launching shock echo, in position, corrugated tube face, H place launches, and is then received by signal receiver T; Meanwhile, when by corrugated tube, there is diffraction phenomenon in impact echo, impact echo and the upper and lower two ends of corrugated tube contact point is respectively B, C and F, E, M, N is respectively circle corrugated pipe uppermost position in fig-ure point and lowermost position is put a little; Bellows Length between some B, M 2 is called bellows Length between some M, C 2 is called diffracted signal contacts at a D with the corrugated tube other end.

7. a kind of mud jacking density intelligent detecting method based on flat survey method as claimed in claim 3, is characterized in that, by setting up empty appraising model, according to the theoretical value R that can extrapolate empty radius during reflection wave Mintrop wave sound _tt during Mintrop wave sound theoretical with diffracted wave _2t, determine in measured data diffracted wave actual measurement Mintrop wave sound time T ₂, relation during analysis diffracted wave Mintrop wave sound between theoretical value and measured value, obtains one about the check coefficient between measured value and theoretical value namely according to this check coefficient and empty radius theoretical value R _t, the size of empty radius measured value R can be extrapolated.

8. a kind of mud jacking density intelligent detecting method based on flat survey method as claimed in claim 7, is characterized in that, empty internal diameter theoretical value R _tt during Mintrop wave sound theoretical with diffracted wave _2tdeterministic process as follows:

1) try to achieve according to known conditions: $L_{TH}=\frac{T_1\×v}{2};$ $L_{TI}=\frac{D_{TR}}{2};$ $L_{IO}=\frac{L}{2};$

2) with Δ TOI for research object, carry out key distance and angle solve: $\∠TOI=\arccos \left(\frac{{L_{HO}}^2+{L_{TO}}^2-{L_{TH}}^2}{2\×L_{HO}\×L_{TO}}\right);$

3) with Δ TBO for research object, carry out key distance and angle solve: by can try to achieve $\∠TOB=\arccos \frac{R_t}{\[\sqrt{\frac{{\left({\mathrm{vT}}_1\right)}^2}{4}+2R_t\sqrt{\frac{{\left({\mathrm{vT}}_1\right)}^2}{4}-\frac{{D_{TR}}^2}{4}+{R_t}^2}}\]};$

4) with Δ COD for research object, carry out key distance and angle solve: $arccos(\∠COD)=\frac{{L_{OC}}^2+{L_{OD}}^2-{L_{CD}}^2}{2\×L_{OC}\×L_{OD}};$

5) according to diffraction curve path analysis:

Wherein, L _tHfor TH spacing; T ₁during for reflection wave Mintrop wave sound; V is the velocity of propagation of impact echo in concrete; L _tIfor TI spacing; D _tRfor signal receiver T signal generator R distance between the two; L _iOfor IO spacing; L is concrete slab thickness.