CN112345565A - Neutron transmission imaging system for assembly type wall detection and application thereof - Google Patents
Neutron transmission imaging system for assembly type wall detection and application thereof Download PDFInfo
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/025—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material using neutrons
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Abstract
The invention discloses a neutron transmission imaging system for assembly wall detection and application thereof, relating to the technical field of nondestructive detection, comprising neutron transmitter assemblies which are arranged at two sides of a detected assembly wall and used for transmitting fast neutrons and a neutron receiver assembly used for receiving thermal neutrons, wherein the neutron transmitter assemblies and the neutron receiver assemblies are respectively and fixedly arranged on a first driving device and a second driving device which can drive the neutron transmitter assemblies and the neutron receiver assemblies to move on a vertical surface parallel to the vertical surface of the detected assembly wall so as to move in a two-dimensional plane; the invention can effectively detect the connection quality in the building wall and has high reliability.
Description
Technical Field
The invention relates to the field of nondestructive testing, in particular to a neutron transmission imaging system for testing an assembled building wall.
Background
The grouting saturation of the fabricated concrete wall structure and the connection quality between walls thereof, such as sleeve connection and grout anchor connection, directly affects the safety of the structure. At present, the quality of the connection node of the prefabricated concrete structure lacks of an effective detection means. In recent years, more and more attention is paid to methods for detecting grouting fullness of connecting joints of sleeves of prefabricated concrete structures, and various methods and patents are shown in the eight figures and appear in the eight hundreds of thousands of stories, but a reliable and effective detection method cannot be achieved. The problems of lacking of ribs, cavities, unqualified concrete marks and the like exist in the wall structure.
The mainstream detection methods available in the literature currently include: ultrasonic flaw detection, electromagnetic wave (radar), impact echo, and X-ray. When the ultrasonic flaw detection method is used for detecting the internal structure of the concrete, the detection result is greatly influenced by the coupling of the transducer, and the diffraction and scattering of ultrasonic waves in the internal structure of the concrete cause the result to have high multiplicity. When the electromagnetic wave method (radar method) is used for detecting the grouting saturation of the concrete inner sleeve, the inner condition cannot be detected due to the shielding of the metal material of the sleeve. The mechanism of the impulse echo method is to use pulse mechanical wave to impact a detection point and measure the echo. Similar to the ultrasonic method, the echo of the impact echo method has great ambiguity, and the conclusion of the grouting quality of the sleeve cannot be reliably obtained. The X-ray method is a new method applied to the detection of construction engineering in recent years, and is characterized in that imaging is performed by transmitting a subject. However, the X-ray method has the problem of limited depth of penetration into the metal object, and has a general effect of imaging the detail difference inside the metal tube, and specific element components cannot be respectively extracted.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a neutron transmission imaging system for assembled wall detection and application thereof, and aims to solve the technical problem that equipment for detecting the connection quality of an assembled building in the prior art is insufficient.
The invention is realized by the following technical scheme:
the invention provides a neutron transmission imaging system for assembly wall detection, which comprises neutron transmitter assemblies and neutron receiver assemblies, wherein the neutron transmitter assemblies are arranged on two sides of a detected assembly wall and used for transmitting fast neutrons, the neutron receiver assemblies are used for receiving thermal neutrons, the neutron transmitter assemblies and the neutron receiver assemblies are respectively and fixedly arranged on a first driving device and a second driving device which can drive the neutron transmitter assemblies and the neutron receiver assemblies to move on a vertical surface parallel to the vertical surface of the detected assembly wall and in a two-dimensional plane, the neutron transmitter assemblies are connected with the first driving device, the neutron receiver assemblies are connected with the second driving device, and the first driving device and the second driving device are respectively connected with a main control device.
Further, the first driving device is specifically composed of a first guide rail, a first support frame horizontally slidably mounted on the first guide rail, a first horizontal driving assembly for driving the first support frame to horizontally reciprocate on the first guide rail, a first vertical driving assembly for driving the neutron transmitter assembly vertically slidably mounted on the first support frame to vertically reciprocate, and a transmitting host installed in the first support frame and respectively connected with the neutron transmitter assembly, the first horizontal driving assembly and the first vertical driving assembly, and the transmitting host is connected with the main control device.
Further, the second driving device is specifically composed of a second guide rail, a second support frame horizontally slidably mounted on the second guide rail, a second horizontal driving assembly for driving the second support frame to horizontally reciprocate on the second guide rail, a second vertical driving assembly for driving the neutron receiver assembly vertically slidably mounted on the second support frame to vertically reciprocate, and a receiving host installed in the second support frame and respectively connected with the neutron receiver assembly, the second horizontal driving assembly and the second vertical driving assembly, and the receiving host is connected with the main control device.
Further, the transmitting host comprises a first lithium battery power supply, a first mainboard, a first motor driving module and a first wireless transceiving module, the neutron transmitter assembly, the first motor driving module, the first wireless transceiving module and the first lithium battery power supply are respectively connected with the first mainboard, and the first mainboard is connected with the main control device through the first wireless transceiving module.
Further, the receiving host comprises a second lithium battery power supply, a second mainboard, a second motor driving module and a second wireless transceiver module, the neutron receiver assembly, the second motor driving module, the second wireless transceiver module and the second lithium battery power supply are respectively connected with the second mainboard, and the second mainboard is connected with the main control device through the second wireless transceiver module.
Further, the neutron transmitter assembly comprises a transmitter main board and a neutron source module, and the first main board and the neutron source module are respectively connected with the transmitter main board.
Furthermore, the neutron receiver assembly comprises a receiver main board and a thermal neutron detection module, and the second main board and the thermal neutron detection module are respectively connected with the receiver main board.
Further, the main control device comprises a third main board, a display, a third wireless transceiver module and a third lithium battery power supply.
The invention also provides a method for detecting grouting saturation of an inner sleeve of an assembly building wall by using the system, which comprises the steps of respectively installing a first driving device and a second driving device at two sides of the assembly building wall to be detected, symmetrically arranging a neutron transmitter assembly and a neutron receiver assembly relative to the center of the assembly building wall to be detected, synchronously moving the neutron transmitter assembly and the neutron receiver assembly under the control of a main control device through the first driving device and the second driving device respectively, and then carrying out the following steps:
s1, determining the following parameters and inputting the parameters into the main control device (5): a detection area S is defined, the thickness d of the wall body of the assembled building to be detected, the burial depth h of the sleeve in the detection area, the outer diameter R of the sleeve and the inner diameter R of the sleeve are detected1Radius of reinforcement r2；
S2, establishing a coordinate system: the left lower side of a detection area S is an origin, the horizontal direction is an x axis, the vertical direction is a y axis, the length in the horizontal direction is L, L is an integral multiple of the side length V of a rectangular bottom of a receiving section of the neutron receiver assembly (2), the length in the vertical direction is H, H is an integral multiple of the side length U of the rectangular side of the receiving section of the neutron receiver assembly (2), and the detection area S is (LXH);
s3, according to the established coordinate system, the neutron transmitter assembly (1) and the neutron receiver assembly (2) synchronously move to two sides of a left lower point of the S area, then the probe of the neutron transmitter assembly (1) is irradiated by primary neutrons, the neutron receiver assembly (2) carries out thermal neutron scattering acquisition, and the cross-section thermal neutron single transmission imaging p of the probe of the neutron receiver assembly (2) is obtained11；
S4, synchronously moving the neutron transmitter assembly (1) and the neutron receiver assembly (2) upwards by a dH distance, performing neutron irradiation and scattering acquisition again, and acquiring single transmission imaging p12，dH＝U；
S5, moving the dH distance upwards again, repeating the step S4 until the height scanning of the y axis H is completed, and forming a continuous thermal neutron transmission graph sequence p1m，m＝1～M，M＝H/dH；
S6, moving dL to the right, where dL equals V, and repeating steps S4 and S5 to form a2 nd continuous sequence of neutron scattering images p2m；
S7, scanning from left to right to form N columns of thermal neutron scattering image arrays { pNM}；
And S8, performing two-bit filtering processing on all the transmission images, splicing the transmission images in sequence to form a series of transmission images P which can be used for discrimination, and judging the grouting saturation of the sleeve in the detection area according to the images P.
Further, the method also comprises the steps of setting a neutron radiation dose before formal detection, uniformly using the dose in the detection process, carrying out neutron transmission calibration on a standard sample on site before or after S1-8 is carried out on the fabricated building wall, and obtaining a standard value of transmission data of the standard sample, wherein the standard sample comprises: the concrete test block without any structure inside, the test block with the standard sleeve, the steel bar and the slurry inside, and the test block without the slurry inside with the standard sleeve and the steel bar; step S8 specifically includes:
s8.1, observing the uniformity of the non-sleeve area of the serial transmission image P, comparing the transmission data with a corresponding standard value, and if the image is not uniform and the value of the transmission data of the non-uniform area of the image is smaller than the corresponding standard value, determining that an internal cavity is abnormal in the corresponding non-sleeve area;
s8.2, observing the uniformity of the sleeve area of the serial transmission images P, comparing the transmission data with the corresponding standard value, and if the images are not uniform and the transmission data value of the image non-uniform area is smaller than the corresponding standard value, determining that the non-sleeve area has grouting unsaturation abnormality.
Compared with the prior art, the invention has the following advantages:
1) the invention can detect the grouting compactness in the connecting sleeve of the wall body of the fabricated building and can give a reference value, and the X-ray detection mode is influenced by the heavy metal of the steel of the sleeve and has poor recognition effect on the interior of the steel of the sleeve;
2) compared with the equipment using an ultrasonic method and an impact echo method, the method can obtain internal images, can realize quantitative judgment and has high reliability;
3) the invention does not need other pre-embedded sensors and other auxiliary processes, does not interfere the construction process and has good applicability;
4) the invention uses the continuous automatic scanning imaging technology, can efficiently finish the detection of the assembled building wall, and has high working efficiency.
Drawings
FIG. 1 is a schematic view of the structure of an apparatus in embodiment 1;
fig. 2 is a schematic diagram of connection of circuit elements in the system according to embodiment 1;
FIG. 3 is a schematic structural view of a joint between a base plate and a wall in example 3;
FIG. 4 is a calibration image of the area A1 without any structure inside in example 3;
FIG. 5 is a calibration image of the area A2 containing the standard sleeve and the steel bar inside but no slurry in example 3;
FIG. 6 is a calibration image of the area A3 containing the standard sleeve, steel bars and slurry inside in example 3;
FIG. 7 is a series of transmission images P finally formed of the detection region in example 3;
fig. 8 is a series of transmission images P finally formed for the detection region formed by another coupling sleeve in example 3.
In the figure: 1. a neutron transmitter assembly; 2. a neutron receiver assembly; 3. a first driving device; 4. a second driving device; 5. a main control device; 6. a first guide rail; 7. a first support frame; 8. a first horizontal drive assembly; 9. a first vertical drive assembly; 10. a transmitting host; 11. a second guide rail; 12. a second support frame; 13. a second horizontal drive assembly; 14. a second vertical drive assembly; 15. receiving a host; 16. a first lithium battery power supply; 17. a first main board; 18. a first motor drive module; 19. a first wireless transceiving module; 20. a second lithium battery power supply; 21. a second main board; 22. a second motor drive module; 23. a second wireless transceiver module; 24. a transmitter motherboard; 25. a neutron source module; 26. a receiver main board; 27. a thermal neutron detection module; 28. a third main board; 29. a display; 30. a third wireless transceiver module; 31. third lithium battery power supply
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention utilizes the principle that neutrons are not charged and can easily penetrate through an electron layer, so that when the neutrons irradiate a precast concrete plate containing reinforcing steel bars and reinforcing steel bar sleeves (as shown in figure 3), the neutrons can easily penetrate through the reinforcing steel bar sleeves, collide with hydrogen atoms contained in grouting materials in the sleeves to form scattering, finally are slowed into thermal neutrons, the thermal neutrons are scattered towards the periphery, the distribution density of the thermal neutrons is obtained by receiving the scattered thermal neutrons, and a neutron scattering image of a detection area can be formed (or corresponding data can be obtained under automatic and continuous emission and receiving, so that a corresponding distribution density image can be synthesized), so that the corresponding internal structure condition can be obtained, and the internal quality condition of the structure can be obtained by comparing the neutron scattering image with data obtained by detecting standard parts (namely, the grouting saturated materials).
Utilizing the above principles, the present invention provides the following apparatus.
Example 1
With reference to fig. 1, the present embodiment provides a neutron transmission imaging system for assembled wall detection, including a neutron transmitter assembly 1 for transmitting fast neutrons and a neutron receiver assembly 2 for receiving thermal neutrons, which are disposed on two sides of a detected assembled wall, the neutron transmitter assembly 1 and the neutron receiver assembly 2 are respectively and fixedly mounted on a first driving device 3 and a second driving device 4 which can drive the neutron transmitter assembly and the neutron receiver assembly to move on a vertical plane parallel to a vertical plane where the detected assembled wall is located, and then on a two-dimensional plane, the neutron transmitter assembly 1 is connected with the first driving device 3, the neutron receiver assembly 2 is connected with the second driving device 4, and the first driving device 3 and the second driving device 4 are respectively connected with a main control device 5.
The working principle is as follows:
when the device works, the main control device 5 controls the neutron transmitter assembly 1 to move through the first driving device 3, controls the neutron receiver assembly 2 to move through the second driving device 4, and simultaneously feeds back data generated in the running process of the neutron transmitter assembly 1, the neutron receiver assembly 2, the first driving device 3 and the second driving device 4 to the main control author 5;
specifically, the method comprises the following steps: after the equipment is installed, firstly, the neutron transmitter assembly 1 and the neutron receiver assembly 2 are controlled to synchronously move through the main control device 5 through the first driving device 3 and the second driving device 4, one emitting neutron receives and obtains the density of thermal neutrons and feeds the density back to the main control device 5, through continuous scanning, the main control device 5 can correspondingly judge according to the comparison of the received information and standard data (namely data obtained by detecting grouting saturated materials), and can also make the detected data into neutron distribution images, when the distribution density of the neutron images detected at a certain part is obviously lower than the neutron density under the same conditions, the unsaturated problem in the area can be judged, and the unsaturated degree is given, so that the effective detection of the building connection quality is realized.
In particular, in this embodiment, with reference to the accompanying drawings, the first driving device 3 is specifically composed of a first guide rail 6, a first support frame 7 horizontally slidably mounted on the first guide rail 6, a first horizontal driving assembly 8 for driving the first support frame 7 to horizontally reciprocate on the first guide rail 6, a first vertical driving assembly 9 for driving the neutron transmitter assembly 1 vertically slidably mounted on the first support frame 7 to vertically reciprocate, and a transmitting host 10 installed in the first support frame 7 and respectively connected to the neutron transmitter assembly 1, the first horizontal driving assembly 8 and the first vertical driving assembly 9, where the transmitting host 10 is connected to the main control device 5; the first guide rail 6 is composed of two rails which are arranged horizontally and in parallel (it can also be formed by assembling a plurality of sections of rails, thereby being convenient for adjusting the corresponding length according to the requirement), the bottom of the first support frame 7 on the first guide rail is provided with a plurality of rollers which are erected on the first guide rail 6, and the first horizontal driving assembly 8 is fixedly arranged in the first support frame 7 and can drive the first support frame 7 to horizontally reciprocate on the first guide rail 6 through the driving rollers (the first horizontal driving assembly 8 can be a stepping motor, the output device of which is connected with one roller, thereby being capable of driving the corresponding roller to rotate, thereby driving the whole first support frame 7 to horizontally reciprocate, in particular, for being convenient to control, the roller can also be replaced by a gear, the corresponding first guide rail 6 is provided with a uniform tooth socket which is meshed with the gear, thereby being capable of controlling the process through the tooth socket, further, in order to further control the stepping precision, the first horizontal driving assembly 8 and the first guide rail 6 can be integrally replaced by linear modules, and the same first vertical driving assembly 8 can also be linear modules, so that the purpose of accurately controlling the position of the equipment is achieved), and the movement of the neutron transmitter assembly 1 in the horizontal direction is realized; the first vertical driving assembly 9 in the vertical direction is arranged on the first support frame 7, and in this embodiment, the first vertical driving assembly can be a linear module, or can be a hollow guide rail (the cross section of the guide rail is rectangular, the neutron transmitter assembly 1 is slidably arranged on the guide rail through a sleeve) and a stepping motor, a driving groove is formed in one side wall of the guide rail, which faces the first vertical driving assembly 9, inner teeth are uniformly arranged on one vertical wall of the driving groove, an output shaft corresponding to the stepping motor penetrates through the sleeve and is arranged in the driving groove and fixedly connected with a gear which is meshed with the inner teeth, the output shaft is meshed with the inner teeth through a rotating gear, the vertical height of the neutron transmitter assembly 1 can be effectively adjusted to achieve the purpose, and the first vertical driving assembly 9 and the first support frame 7 can also be connected through other modes as long as the neutron transmitter assembly 1 can be driven to vertically reciprocate, thereby realizing the two-dimensional motion of the neutron transmitter assembly 1 on the vertical surface;
meanwhile, in order to effectively control and provide power for the first horizontal driving assembly 8 and the first vertical driving assembly 9, in this embodiment, the transmitting host 10 includes a first lithium battery power supply 16 (in this embodiment, all lithium battery power supplies are composed of large-capacity lithium batteries, and power is supplied to other power consuming devices, and power supply and charging are controlled by corresponding motherboards, and power supply can be synchronously performed while charging), a first motherboard 17 (in this embodiment, the first motherboard 17 is centered on an STM32F103 embedded ARM chip, and includes a power management circuit (CN3763 battery management unit) and a motor driving circuit (i.e., a first motor driving module 18) which function to be responsible for communication with the main control device 5, drive the first vertical driving assembly 9 and the first horizontal driving assembly 8, and simultaneously control the neutron transmitter assembly 1), the first motor driving module 18, and a first wireless transceiver module 19 (in this embodiment, the first wireless transceiver module is configured to be responsible for communication with the main control device 5 The block 19 consists of a 433MHz AM communication module), the neutron transmitter assembly 1, the first motor driving module 18, the first wireless transceiver module 19 and the first lithium battery power supply 16 are respectively connected with a first main board 17, and the first main board 17 is connected with the main control device 5 through the first wireless transceiver module 19; the first lithium battery power supply 16 provides electric power for the operation of the first horizontal driving assembly 8, the first vertical driving assembly 9 and the neutron transmitter assembly 1, and the first main board 17 controls the first horizontal driving assembly 8 and the first vertical driving assembly 9 through the first motor driving module 18 respectively; meanwhile, the first main board 17 performs information transmission on the main control device 5 through the first wireless transceiver module 19.
In this embodiment, the neutron transmitter assembly 1 includes a transmitter main board 24 and a neutron source module 25, and the first main board 17 and the neutron source module 25 are respectively connected to the transmitter main board 24; the first main board 17 is connected to the transmitter main board 24 through a tow chain, which facilitates high-speed data transmission, and meanwhile, the transmitter main board 24 controls the working state of the neutron source module 25, and the first main board 17 can also control the working state of the neutron source module 25 through the first wireless transceiver module 19 via the transmitter main board 24 and obtain corresponding information.
Particularly, in this embodiment, the second driving device 4 is specifically composed of a second guide rail 11, a second support frame 12 horizontally slidably mounted on the second guide rail 11, a second horizontal driving assembly 13 for driving the second support frame 12 to horizontally reciprocate on the second guide rail 11, a second vertical driving assembly 14 for driving the neutron receiver assembly 2 vertically slidably mounted on the second support frame 12 to vertically reciprocate, and a receiving host 15 installed in the second support frame 12 and connected to the neutron receiver assembly 2, the second horizontal driving assembly 13, and the second vertical driving assembly 14, respectively, where the receiving host 15 is connected to the main control device 5, the receiving host 15 includes a second lithium battery power supply 20, a second main board 21 (same as the first main board 17), a second motor driving module 22, and a second wireless transceiving module 23, and the neutron receiver assembly 2, the second motor driving module 22, The second wireless transceiver module 23 and the second lithium battery power supply 20 are respectively connected with the second main board 21, the second main board 21 is connected with the main control device 5 through the second wireless transceiver module 23, the neutron receiver assembly 2 comprises a receiver main board 26 and a thermal neutron detection module 27, and the second main board 21 and the thermal neutron detection module 27 are respectively connected with the receiver main board 26.
The first driving device 3 and the second driving device 4 have substantially the same structure and operation principle, and only differ in that one is for controlling the movement of the neutron source module 25, and the other is for controlling the movement of the neutron detection module 27, that is, one side emits neutrons, and the other side receives thermal neutrons, and the main control device 5 performs data transceiving, so the functions of the components of the second driving device 4, the receiver host 15, and the neutron receiver assembly 2 are not described herein.
In order to facilitate the overall operation of the control device, in this embodiment, the main control device 5 includes a third main board 28, a display 29, a third wireless transceiver module 30, and a third lithium battery power source 31; the display 29 may be a touch display, which facilitates control and parameter adjustment of the device, and the third main board 28 controls the whole operation of the device, and performs operation and control of the remote device and data acquisition through the third wireless transceiver module 30, the first wireless transceiver module 19 and the second wireless transceiver module 23.
Particularly, in the embodiment, the driving assemblies all comprise stepping motors, and other structures only need to drive corresponding devices to perform corresponding motions; meanwhile, in order to adjust the distance between the neutron transmitter assembly 1 and the neutron receiver assembly 2 and the measured wall conveniently, a vertical driving assembly capable of driving the neutron transmitter assembly 1 or the neutron receiver assembly 2 to reciprocate horizontally and perpendicularly to the direction of the measured wall can be additionally arranged between the neutron transmitter assembly 1 or the neutron receiver assembly 2 and the corresponding vertical driving assembly, for example, the vertical driving assembly is composed of an electric telescopic rod and the like, the neutron transmitter assembly 1 or the neutron receiver assembly 2 is fixed at the outer end of the corresponding electric telescopic rod, the distance between the corresponding wall and the measured wall can be effectively controlled according to the telescopic distance, other structures can be set, the same purpose can be achieved only by the arrangement, and similarly, all the driving assemblies can be synchronous belt sliding tables and are controlled by corresponding control equipment, so that the control precision of the equipment can be improved conveniently.
All mainboards in this embodiment are STM32F103 embedded ARM main control units, and all wireless transceiver modules are 433MHz wireless transceiver units.
Example 2
The embodiment provides a method for detecting grouting saturation of an inner sleeve of an assembly type building wall by using the equipment, which specifically comprises the following steps:
firstly, a first driving device 3 and a second driving device 4 are respectively installed on two sides of a detected fabricated building wall, a neutron transmitter assembly 1 and a neutron receiver assembly 2 are symmetrically arranged around the center of the detected fabricated building wall, and synchronously move under the control of the first driving device 3 and the second driving device 4 respectively by a main control device 5, and then the following steps are carried out:
s1, determining the following parameters and inputting them to the main control device 5: a detection area S is defined, the thickness d of the wall body of the assembled building to be detected, the burial depth h of the sleeve in the detection area, the outer diameter R of the sleeve and the inner diameter R of the sleeve are detected1Radius of reinforcement r2；
S2, establishing a coordinate system: the left lower side of a detection area S is an origin, the horizontal direction is an x axis, the vertical direction is a y axis, the length in the horizontal direction is L, L is an integral multiple of the side length V of the rectangular bottom of the receiving section of the neutron receiver assembly 2, the vertical length is H, H is an integral multiple of the side length U of the rectangular side of the receiving section of the neutron receiver assembly 2, and the detection area S is (LXH);
s3, according to the established coordinate system, the neutron transmitter assembly 1 and the neutron receiver assembly 2 synchronously move to two sides of the lower left point of the S area, then the probe of the neutron transmitter assembly 1 enters primary neutron irradiation and the neutron receiver assembly 2 carries out thermal neutron scattering acquisition, and the cross-section thermal neutron single transmission imaging p of the probe of the neutron receiver assembly 2 is obtained11；
S4, synchronously moving the neutron transmitter assembly 1 and the neutron receiver assembly 2 upwards for a dH distance, performing neutron irradiation and scattering acquisition again, and acquiring single transmission imaging p12，dH＝U；
S5, moving the dH distance upwards again, repeating the step S4 until the height scanning of the y axis H is completed, and forming a continuous thermal neutron transmission graph sequence p1m，m＝1～M，M＝H/dH；
S6, moving dL to the right, where dL equals V, and repeating steps S4 and S5 to form a2 nd continuous sequence of neutron scattering images p2m；
S7, scanning from left to right to form N columns of thermal neutron scattering image arrays { pNM}；
And S8, performing two-bit filtering processing on all the transmission images, splicing the transmission images in sequence to form a series of transmission images P which can be used for discrimination, and judging the grouting saturation of the sleeve in the detection area according to the images P.
Specifically, the method further comprises the steps of setting a neutron radiation dose before formal detection, uniformly using the dose in the detection process, carrying out neutron transmission calibration on a standard sample on site before or after S1-8 of the fabricated building wall, and obtaining a standard value of transmission data of the standard sample, wherein the standard sample comprises: the concrete test block without any structure inside, the test block with the standard sleeve, the steel bar and the slurry inside, and the test block without the slurry inside with the standard sleeve and the steel bar; the step S1-13 is specifically as follows:
s8.1, observing the uniformity of the non-sleeve area of the serial transmission image P, comparing the transmission data with a corresponding standard value, and if the image is not uniform and the value of the transmission data of the non-uniform area of the image is smaller than the corresponding standard value, determining that an internal cavity is abnormal in the corresponding non-sleeve area;
s8.2, observing the uniformity of the sleeve area of the serial transmission images P, comparing the transmission data with the corresponding standard value, and if the images are not uniform and the transmission data value of the image non-uniform area is smaller than the corresponding standard value, determining that the non-sleeve area has grouting unsaturation abnormality.
Example 3
The following experiments were performed using the apparatus and method described above:
1) the method of embodiment 2 is used for detecting the connection quality of the bottom plate and the wall body shown in fig. 3 by using the equipment shown in embodiment 1, and specifically comprises the following steps:
2) the thickness d of the wall body is 200 mm. The equipment is used for carrying out calibration sampling on each part of a wall sample plate with the thickness of 200mm, and the wall sample plate comprises a region A1 without any structure inside, a region A2 with standard sleeves, steel bars and no slurry inside, and a region A3 with standard sleeves, steel bars and slurry inside. Forming a calibration image PA1(FIG. 4) PA2(FIG. 5) PA3(FIG. 6).
3) As an implementation example, one of the connecting sleeves in FIG. 3 is selected to define a detection area, and the area 1 is divided into N columns and M rows of equally-divided grids. Using dedicated automated neutron scattering scanning imaging equipmentContinuously and automatically scanning the area according to the step length of the equal grid to form a neutron scattering image array { p }NM}。
4) Array of neutron scattering images pNMData processing is performed using the data processing technique of the present invention to form a series of transmission images P shown in fig. 7. As can be seen from the series of transmission images P, there is unsaturation in the sleeve, and the unsaturation q is 14.09%, which is calculated as follows:
s is the picture PA1Neutron density mean, PA1S is 1.682e5/m2；
spiNeutron density at the position of unsaturation in the detected image, one sampling point s of the abnormal region in FIG. 7pi＝1.445e5/m2。
5) Similarly, another connecting sleeve is selected for detection, fig. 8 is a series of transmission images P, and an abnormal area exists on the left side of the middle of the series of transmission images P, and a sampling point s of the abnormal area in the abnormal areapi＝1.445e5/m2The unsaturation degree q is 29.43%
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The utility model provides a neutron transmission imaging system for assembled wall body detects, its characterized in that, is including setting up neutron transmitter assembly (1) and neutron receiver assembly (2) that are used for transmitting fast neutron in being detected assembled wall body both sides, neutron transmitter assembly (1) and neutron receiver assembly (2) respectively fixed mounting can drive it and then on first drive arrangement (3) and second drive arrangement (4) of two-dimensional planar motion on the vertical face parallel with the vertical face of being detected assembled wall body place, neutron transmitter assembly (1) is connected with first drive arrangement (3), neutron receiver assembly (2) are connected with second drive arrangement (4), and first drive arrangement (3) and second drive arrangement (4) are connected with master control set (5) respectively.
2. The neutron transmission imaging system for assembled wall detection of claim 1, the device is characterized in that the first driving device (3) is composed of a first guide rail (6), a first support frame (7) horizontally and slidably mounted on the first guide rail (6), a first horizontal driving assembly (8) used for driving the first support frame (7) to horizontally reciprocate on the first guide rail (6), a first vertical driving assembly (9) used for driving a neutron transmitter assembly (1) vertically and slidably mounted on the first support frame (7) to vertically reciprocate, and a transmitting host (10) mounted in the first support frame (7) and respectively connected with the neutron transmitter assembly (1), the first horizontal driving assembly (8) and the first vertical driving assembly (9), wherein the transmitting host (10) is connected with the main control device (5).
3. A neutron transmission imaging system for assembled wall detection according to claim 2, the device is characterized in that the second driving device (4) is composed of a second guide rail (11), a second support frame (12) horizontally and slidably mounted on the second guide rail (11), a second horizontal driving assembly (13) used for driving the second support frame (12) to horizontally reciprocate on the second guide rail (11), a second vertical driving assembly (14) used for driving the neutron receiver assembly (2) vertically and slidably mounted on the second support frame (12) to vertically reciprocate, and a receiving host (15) mounted in the second support frame (12) and respectively connected with the neutron receiver assembly (2), the second horizontal driving assembly (13) and the second vertical driving assembly (14), wherein the receiving host (15) is connected with the main control device (5).
4. The neutron transmission imaging system for assembled wall detection according to claim 3, wherein the emission host (10) comprises a first lithium battery power supply (16), a first main board (17), a first motor driving module (18) and a first wireless transceiver module (19), the neutron transmitter assembly (1), the first motor driving module (18), the first wireless transceiver module (19) and the first lithium battery power supply (16) are respectively connected with the first main board (17), and the first main board (17) is connected with the main control device (5) through the first wireless transceiver module (19).
5. The neutron transmission imaging system for the assembled wall detection according to claim 4, wherein the receiving host (15) comprises a second lithium battery power supply (20), a second main board (21), a second motor driving module (22) and a second wireless transceiver module (23), the neutron receiver assembly (2), the second motor driving module (22), the second wireless transceiver module (23) and the second lithium battery power supply (20) are respectively connected with the second main board (21), and the second main board (21) is connected with the main control device (5) through the second wireless transceiver module (23).
6. A neutron transmission imaging system for assembled wall detection according to claim 5, characterized in that the neutron transmitter assembly (1) comprises a transmitter main board (24) and a neutron source module (25), the first main board (17) and the neutron source module (25) being respectively connected with the transmitter main board (24).
7. The neutron transmission imaging system for assembled wall detection according to claim 6, characterized in that the neutron receiver assembly (2) comprises a receiver main board (26) and a thermal neutron detection module (27), and the second main board (21) and the thermal neutron detection module (27) are respectively connected with the receiver main board (26).
8. Neutron transmission imaging system for assembled wall detection according to claim 7, characterized in that the main control device (5) comprises a third main board (28), a display (29), a third wireless transceiver module (30) and a third lithium battery power supply (31).
9. A method for detecting grouting saturation of sleeves in fabricated building walls by using the system of any one of claims 1-8, wherein the method comprises installing a first driving device (3) and a second driving device (4) on both sides of the fabricated building wall to be detected, and arranging a neutron transmitter assembly (1) and a neutron receiver assembly (2) symmetrically about the center of the fabricated building wall to be detected, and synchronously moving the neutron transmitter assembly and the neutron receiver assembly under the control of a main control device (5) through the first driving device (3) and the second driving device (4), and then performing the following steps:
s1, determining the following parameters and inputting the parameters into the main control device (5): a detection area S is defined, the thickness d of the wall body of the assembled building to be detected, the burial depth h of the sleeve in the detection area, the outer diameter R of the sleeve and the inner diameter R of the sleeve are detected1Radius of reinforcement r2；
S2, establishing a coordinate system: the left lower side of a detection area S is an origin, the horizontal direction is an x axis, the vertical direction is a y axis, the length in the horizontal direction is L, L is an integral multiple of the side length V of a rectangular bottom of a receiving section of the neutron receiver assembly (2), the length in the vertical direction is H, H is an integral multiple of the side length U of the rectangular side of the receiving section of the neutron receiver assembly (2), and the detection area S is (LXH);
s3, according to the established coordinate system, the neutron transmitter assembly (1) and the neutron receiver assembly (2) synchronously move to two sides of a left lower point of the S area, then the probe of the neutron transmitter assembly (1) is irradiated by primary neutrons, the neutron receiver assembly (2) carries out thermal neutron scattering acquisition, and the cross-section thermal neutron single transmission imaging p of the probe of the neutron receiver assembly (2) is obtained11；
S4, synchronously moving the neutron transmitter assembly (1) and the neutron receiver assembly (2) upwards by a dH distance, performing neutron irradiation and scattering acquisition again, and acquiring single transmission imaging p12，dH＝U；
S5, moving the dH distance upwards again, repeating the step S4 until the height scanning of the y axis H is completed, and forming a continuous thermal neutron transmission graph sequence p1m，m＝1～M，M＝H/dH；
S6, moving dL to the right, where dL equals V, and repeating steps S4 and S5 to form a2 nd continuous sequence of neutron scattering images p2m；
S7, scanning from left to right to form N columns of thermal neutron scattering image arrays { pNM}；
And S8, performing two-bit filtering processing on all the transmission images, splicing the transmission images in sequence to form a series of transmission images P which can be used for discrimination, and judging the grouting saturation of the sleeve in the detection area according to the images P.
10. The method of claim 9, further comprising setting a neutron radiation dose before performing the formal inspection, uniformly using the dose during the inspection, performing neutron transmission calibration on a standard sample on site before or after performing S1-8 on the fabricated building wall, and obtaining a standard value of transmission data of the standard sample, wherein the standard sample comprises: the concrete test block without any structure inside, the test block with the standard sleeve, the steel bar and the slurry inside, and the test block without the slurry inside with the standard sleeve and the steel bar; step S8 specifically includes:
s8.1, observing the uniformity of the non-sleeve area of the serial transmission image P, comparing the transmission data with a corresponding standard value, and if the image is not uniform and the value of the transmission data of the non-uniform area of the image is smaller than the corresponding standard value, determining that an internal cavity is abnormal in the corresponding non-sleeve area;
s8.2, observing the uniformity of the sleeve area of the serial transmission images P, comparing the transmission data with the corresponding standard value, and if the images are not uniform and the transmission data value of the image non-uniform area is smaller than the corresponding standard value, determining that the non-sleeve area has grouting unsaturation abnormality.
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