CN112986385A - Steel shell concrete void detection method by coupling impact mass energy method and neutron method - Google Patents
Steel shell concrete void detection method by coupling impact mass energy method and neutron method Download PDFInfo
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- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/045—Analysing solids by imparting shocks to the workpiece and detecting the vibrations or the acoustic waves caused by the shocks
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- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B15/00—Measuring arrangements characterised by the use of electromagnetic waves or particle radiation, e.g. by the use of microwaves, X-rays, gamma rays or electrons
- G01B15/02—Measuring arrangements characterised by the use of electromagnetic waves or particle radiation, e.g. by the use of microwaves, X-rays, gamma rays or electrons for measuring thickness
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Abstract
The invention provides a steel shell concrete void detection method coupling an impact mass energy method and a neutron method, which belongs to the technical field of steel shell concrete void detection and is used for carrying out global detection on a steel shell concrete structure by utilizing an impact mapping method; extracting a suspected void area by utilizing a wave field separation method according to the global detection result; performing void area imaging processing on the suspected void area by using the impact response intensity, and performing area division on the compaction degree of the suspected void area according to an imaging result; detecting the void average height of the divided area by a neutron method; dividing the steel shell concrete structure into a plurality of grids according to the average height of void and the structural form of the steel shell concrete, and calculating the void ratio of the steel shell concrete based on the grids; and (4) counting the steel shell concrete void ratios of different structural forms to finish the steel shell concrete void detection. The invention solves the problem of nondestructive testing of the steel shell concrete void defect.
Description
Technical Field
The invention belongs to the field of steel shell concrete void detection, and particularly relates to a steel shell concrete void detection method by coupling an impact mass energy method and a neutron method.
Background
The steel shell concrete structure is formed by wrapping concrete by using steel plates, is similar to a sandwich structure, and has the advantages of high bearing capacity, good waterproof performance and the like. However, the concrete pouring compartment of the structure has many concrete pouring compartments, and the concrete self-compaction filling needs to be realized in the closed compartment, so that the structure has the problem of three-component three-high, namely, under the conditions of complex steel shell structure, complex structure internal structure and complex self-compaction concrete flow state, the self-compaction concrete has high performance, high pouring quality and high detection precision after pouring. The steel shell concrete void detection is an important guarantee for ensuring the high-quality construction and the long-term operation safety of the steel shell concrete immersed tube tunnel. Due to the existence of the steel shell, various electromagnetic wave detection methods cannot be applied, the current main nondestructive detection method comprises an elastic wave detection method and a ray detection method, and the elastic wave detection method mainly comprises an ultrasonic method, an impact echo method and a sound beating method; the radiation detection method mainly includes a neutron ray method and the like. The ultrasonic wave cannot be limited by the size of the receiving transducer, only the void defect with the smaller diameter can be identified, and the void depth at the defect position cannot be judged. The impact echo method can distinguish a dense area and a defective area under the condition of a thin steel plate and large void, but cannot quantitatively evaluate the void height of the defect. The sound beating method can only distinguish two states of complete contact and separation of the steel plate and the concrete, when the steel plate and the concrete have the stripping defect of a tiny gap (0.1-1 mm), the sound beating method cannot quantitatively judge the separation distance, misjudgment is easy to occur, and the efficiency is not high. The neutron method has low detection efficiency and cannot meet the requirement of rapid detection and evaluation on the pouring quality of the large-volume steel shell concrete composite structure in engineering. Therefore, the conventional detection method has poor applicability, low detection precision and no reference for mature technology and method. In order to solve the technical problem of nondestructive detection of the concrete void defect of the steel shell and ensure the pouring quality of the engineering, the development of a millimeter-level accurate detection method for the concrete void of the steel shell is urgently needed.
Disclosure of Invention
Aiming at the defects in the prior art, the steel shell concrete void detection method coupling the impact mass energy method and the neutron method solves the problem of nondestructive detection of the steel shell concrete void defect.
In order to achieve the above purpose, the invention adopts the technical scheme that:
the scheme provides a steel shell concrete void detection method coupled with an impact mass energy method and a neutron method, which comprises the following steps:
s1, detecting the global pouring quality: dividing the steel shell concrete structure into a plurality of grids according to the structural form of the steel shell concrete, and carrying out global detection on the steel shell concrete structure by using an impact mapping method based on the grids;
s2, detecting the empty position: extracting a suspected void area by utilizing a wave field separation method according to the global detection result;
s3, detecting void areas: performing void area imaging processing on the suspected void area by using the impact response intensity, and performing area division on the compaction degree of the suspected void area according to an imaging result;
s4, detecting the height of the void: detecting the void average height of the divided area by a neutron method;
s5, calculating the void ratio of the steel shell mixed loading soil: calculating the void ratio of the steel shell concrete by taking the same structural form of the steel shell concrete as a class;
s6, analyzing the void distribution of the steel shell concrete: and (4) counting the void positions, void areas, void heights and void rates of the steel shell concrete with different structural forms, and completing the steel shell concrete void detection.
The invention has the beneficial effects that: the invention solves the technical problem of nondestructive detection of the steel shell concrete void defect, realizes millimeter-grade accurate detection of the steel shell concrete void, and ensures the engineering pouring quality.
Further, the area of the grid in the step S1 is less than 10cm × 10 cm.
The beneficial effects of the further scheme are as follows: the divided grid provides a standard for consistency of the impact mapping and neutron detection positions.
Still further, the test lines in the global detection in step S1 are arranged as follows: the measuring lines are arranged along the direction of the T rib, the distance between the measuring lines is 10cm, the distance between the measuring points is 10cm, the density of the measuring points is 10cm multiplied by 10cm, the encrypted measuring lines are located at the two sides of the partition board and the T rib by 5cm and 15cm, and the density of the encrypted measuring points is 5cm multiplied by 10 cm.
The beneficial effects of the further scheme are as follows: the invention optimizes the detection circuit in the impact image method, and can effectively realize the detection of key areas or areas easy to be void on the basis of global detection.
Still further, the suspected void area in step S2 includes: a suspected void area with a void larger than 5mm in a single point area exceeding 30% exists in the grid, or a suspected void area with a void larger than 3mm in a single point area exceeding 30% exists in the single grid.
The beneficial effects of the further scheme are as follows: and providing a standard for judging a suspected void area according to the void range and the void degree actually determined by the engineering.
Still further, the dividing of the density of the suspected empty area in step S3 includes: a dense area, a void 2-3mm area, a void 3-5mm area, and a void 5mm area.
The beneficial effects of the further scheme are as follows: after the compaction degree is divided, the average height of void in the subdivided region is detected by a neutron method, and the theoretical maximum error of the void height is within +/-1 mm, so that the detection method achieves millimeter-level precision.
Still further, the step S4 includes the steps of:
s401, detecting a 30 cm-30 cm area in the suspected void area by using a neutron method to obtain a void volume;
s402, calculating to obtain the average value of the region void height according to the void area and the void volume, and completing the detection of the void height.
The beneficial effects of the further scheme are as follows: and rechecking the suspected void area by a neutron method to realize millimeter-scale accurate identification of the void defect of the steel shell concrete, wherein the millimeter-scale accurate identification refers to millimeter-scale accuracy of a void position, a void area and a void height.
Still further, the step S5 includes the steps of:
s501, numbering various grids by taking the same steel shell concrete structure form as one type, and counting the suspected emptying times of each grid;
and S502, calculating according to the suspected void times to obtain the void ratio of the steel shell concrete.
The beneficial effects of the further scheme are as follows: the steel shell concrete is formed by splicing a plurality of concrete blocks poured by the fixed templates, and the calculation of the void ratio of the concrete blocks with different shapes provides a theoretical basis for improving the concrete pouring quality.
Still further, the expression of the suspected void ratio in step S503 is as follows:
wherein E represents the suspected void fraction, TEmptyingIndicates the number of suspected voids, TGeneral assemblyThe number of the grids of the same structure is shown.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
Fig. 2 is a schematic view of the arrangement of the measuring lines in the present embodiment.
FIG. 3 is a schematic diagram illustrating the distribution of void regions and dense regions in this embodiment.
Fig. 4 is a diagram showing the concrete in this example actually being empty.
Fig. 5 is a schematic diagram of the detection result in this embodiment.
FIG. 6 is a schematic diagram of the void fraction of the steel shell concrete in this example.
FIG. 7 is a schematic diagram of the void fraction of different steel shells in this example.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.
Examples
As shown in FIG. 1, the invention provides a steel shell concrete void detection method coupling an impact mass energy method and a neutron method, which comprises the following steps:
s1, detecting the global pouring quality: dividing the steel shell concrete structure into a plurality of grids according to the structural form of the steel shell concrete, and carrying out global detection on the steel shell concrete structure by using an impact mapping method based on the grids;
in the embodiment, grids are divided in advance before detection of the void position, and then the steel shell concrete structure is detected by using an impact mapping method, wherein the detection area is 100% global detection; for global detection, line optimization layout research is carried out, namely the magnitude of the knocking energy and the offset distance, the detector arrangement mode, the interface contact condition, the position and the thickness of a steel plate and the like directly influence the data quality and the detection result. As shown in fig. 2, a circle with a large central area is a pouring hole, the other side lines are exhaust holes of a steel shell concrete structure, a black circle represents the distance between impact echo measuring points, a solid arrow represents a measuring line and a direction, a dotted arrow represents an encrypted measuring line and a direction, and the measuring line refers to a detection line when an impact image method is used. And according to the analysis of the results of the multiple detections, setting the measuring line as: the measuring lines are arranged along the direction of the T rib, the distance between the measuring lines is 10cm, the distance between the measuring points is 10cm, the density of the measuring points is 10cm multiplied by 10cm, the measuring lines are encrypted at the positions 5cm and 15cm on two sides of the partition board and the T rib, and the density of the measuring points is 5cm multiplied by 10 cm.
S2, detecting the empty position: extracting a suspected void area by utilizing a wave field separation method according to the global detection result;
in this embodiment, as shown in fig. 3, the darker color region is a void region, the lighter color region with white voids is a bubble region, and the rest are dense regions, and the suspected void region includes: a suspected void area with a void larger than 5mm and a single point area exceeding 30% exists in each cell, or a suspected void area with a void larger than 3mm and a single point area exceeding 30% exists in each cell.
S3, detecting void areas: performing void area imaging processing on the suspected void area by using the impact response intensity, and performing area division on the compaction degree of the suspected void area according to an imaging result;
in this embodiment, as shown in fig. 4 to 5, after the global waveform information processing and the wave field separation of the shock echo are performed, the void area imaging is performed according to the response intensity, the compaction degree of the concrete is expressed by using the temperature of the image color, and the suspected void area is preliminarily divided into a compact area, a void 2-3mm area, a void 3-5mm area, and a void 5mm area or more.
S4, detecting the height of the void: the average height of void in the divided area is detected by a neutron method, and the method is realized as follows:
s401, detecting a 30 cm-30 cm area in the suspected void area by using a neutron method to obtain a void volume;
s402, calculating to obtain the average value of the region void height according to the void area and the void volume, and completing the detection of the void height.
In the embodiment, a suspected void area is rechecked by a neutron method, and two detection results are subjected to coupling analysis, so that millimeter-scale accurate identification of the void defect of the steel shell concrete is realized, wherein the millimeter-scale accurate identification refers to millimeter-scale accuracy of a void position, a void area and a void height. The principle of millimeter level is realized: the impact image method can detect the position and area of void and approximate void thickness, but is difficult to accurately determine the void thickness, the neutron method detects the concrete loss rate of a detection area, the void volume of the concrete can be directly calculated through the loss rate of the area concrete and the volume of the area concrete, then the two methods are combined, firstly, the impact image method is used for detecting a 10cm multiplied by 10cm area, the suspected void area is accurately pointed out, the void area form is drawn, then, the neutron method is used for detecting a 30cm multiplied by 30cm area, the void volume is detected, the void area and the void volume are used for calculating the mean value of the void thickness of the area, in the aspect of realizing millimeter-level precision, the suspected void area is firstly subdivided into void 2-3mm and void 3-5mm through the impact image method, and the areas with the void of 5mm are detected by a neutron method, and the theoretical maximum error of the void height is within +/-1 mm.
S5, calculating the void ratio of the steel shell mixed loading soil: dividing the steel shell concrete structure into a plurality of grids according to the average height of void and the structural form of the steel shell concrete, and calculating the void ratio of the steel shell concrete based on the grids, wherein the implementation method comprises the following steps:
s501, numbering various grids by taking the same steel shell concrete structure form as one type, and counting the suspected emptying times of each grid;
and S502, calculating according to the suspected void times to obtain the void ratio of the steel shell concrete.
In this embodiment, as shown in fig. 6, the structure is divided into grids having smaller areas according to the form of the steel-shell concrete structure (e.g., the distance between T-ribs), the area of the grids is controlled within 10cm × 10cm, the same structure is used as one type, and the grids are labeled. Counting the number of times of suspected emptying of each cell,
like the 3-compartment in fig. 6, suspected emptying occurs 47 times, and the same-numbered standard compartments have 1566, and the emptying rate is 47/1566-3%.
S6, analyzing the void distribution of the steel shell concrete: and (4) counting the void positions, void areas, void heights and void rates of the steel shell concrete with different structural forms, and completing the steel shell concrete void detection.
In the present embodiment, as shown in fig. 7, from the aspects of structural features, concrete mix ratio, casting process, flow state, and the like, the positions, forms, and the like in the bays, which are likely to be empty, are studied, the empty rates of the cells with the same number are counted, the empty cells that are more likely to be empty are analyzed according to the empty rates of the different cell structures, and the forms that are likely to be empty are analyzed, so that guidance suggestions are provided for the subsequent concrete casting.
Claims (8)
1. A steel shell concrete void detection method coupling an impact mass energy method and a neutron method is characterized by comprising the following steps:
s1, detecting the global pouring quality: dividing the steel shell concrete structure into a plurality of grids according to the structural form of the steel shell concrete, and carrying out global detection on the steel shell concrete structure by using an impact mapping method based on the grids;
s2, detecting the empty position: extracting a suspected void area by utilizing a wave field separation method according to the global detection result;
s3, detecting void areas: performing void area imaging processing on the suspected void area by using the impact response intensity, and performing area division on the compaction degree of the suspected void area according to an imaging result;
s4, detecting the height of the void: detecting the void average height of the divided area by a neutron method;
s5, calculating the void ratio of the steel shell mixed loading soil: calculating the void ratio of the steel shell concrete by taking the same structural form of the steel shell concrete as a class;
s6, analyzing the void distribution of the steel shell concrete: and (4) counting the void positions, void areas, void heights and void rates of the steel shell concrete with different structural forms, and completing the steel shell concrete void detection.
2. The method for detecting concrete void in steel shell by coupling shock mass energy method and neutron method according to claim 1, wherein the area of the grid in the step S1 is less than 10cm x 10 cm.
3. The steel-shell concrete void detection method by coupling the ballistic mass method and the neutron method according to claim 2, wherein the measurement lines in the global detection in step S1 are arranged as follows: the measuring lines are arranged along the direction of the T rib, the distance between the measuring lines is 10cm, the distance between the measuring points is 10cm, the density of the measuring points is 10cm multiplied by 10cm, the encrypted measuring lines are located at the two sides of the partition board and the T rib by 5cm and 15cm, and the density of the encrypted measuring points is 5cm multiplied by 10 cm.
4. The method for detecting void in steel shell concrete according to claim 1, wherein the suspected void area in step S2 includes: a suspected void area with a void larger than 5mm in a single point area exceeding 30% exists in the grid, or a suspected void area with a void larger than 3mm in a single point area exceeding 30% exists in the single grid.
5. The method for detecting void in steel shell concrete according to claim 1, wherein the step S3 of classifying the areas with the suspected void areas as dense areas comprises: a dense area, a void 2-3mm area, a void 3-5mm area, and a void 5mm area.
6. The method for detecting concrete void in steel shell by coupling shock mass energy method and neutron method according to claim 1, wherein the step S4 comprises the following steps:
s401, detecting a 30 cm-30 cm area in the suspected void area by using a neutron method to obtain a void volume;
s402, calculating according to the void area and the void volume to obtain the average height of the region void, and completing detection of the void height.
7. The method for detecting concrete void in steel shell by coupling shock mass energy method and neutron method according to claim 1, wherein the step S5 comprises the following steps:
s501, numbering various grids by taking the same steel shell concrete structure form as one type, and counting the suspected emptying times of each grid;
and S502, calculating according to the suspected void times to obtain the void ratio of the steel shell concrete.
8. The method for detecting void in steel shell concrete according to claim 6, wherein the suspected void ratio in step S502 is expressed as follows:
wherein E represents the suspected void fraction, TEmptyingIndicates the number of suspected voids, TGeneral assemblyIndicating the number of isomorphic meshes.
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| CN114517471A (en) * | 2022-04-20 | 2022-05-20 | 西南交通大学 | High-speed railway foundation effective hard layer detection method, device, equipment and readable storage medium |
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