CN113933389A - Major diameter steel pipe concrete grouting compactness detection device - Google Patents
Major diameter steel pipe concrete grouting compactness detection device Download PDFInfo
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- CN113933389A CN113933389A CN202111119636.4A CN202111119636A CN113933389A CN 113933389 A CN113933389 A CN 113933389A CN 202111119636 A CN202111119636 A CN 202111119636A CN 113933389 A CN113933389 A CN 113933389A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- 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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- 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
- G01N29/046—Analysing solids by imparting shocks to the workpiece and detecting the vibrations or the acoustic waves caused by the shocks using the echo of particles imparting on a surface; using acoustic emission of particles
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- 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
- G01N29/07—Analysing solids by measuring propagation velocity or propagation time of acoustic waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- 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
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/24—Probes
- G01N29/2437—Piezoelectric probes
- G01N29/245—Ceramic probes, e.g. lead zirconate titanate [PZT] probes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/01—Indexing codes associated with the measuring variable
- G01N2291/011—Velocity or travel time
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
- G01N2291/0232—Glass, ceramics, concrete or stone
Abstract
A concrete grouting compactness detection device for a large-diameter steel pipe is characterized in that a vertical rod is vertically inserted into a steel pipe, and a sleeve and a telescopic supporting rod are arranged above the vertical rod; the outer side of the sleeve is respectively connected with four telescopic supporting rods, and the end part of each telescopic supporting rod is fixed on the top wall of the steel pipe through an n-shaped buckle; the upper, middle and lower positions of the vertical rod are respectively provided with a built-in piezoelectric ceramic sensor; the fixed seat is sleeved on the top of the vertical rod, a horizontal fixed cross rod is welded on the top of the fixed seat, the cross rod is hinged with a connecting rod, the bottom of the connecting rod is connected with an impact hammer, and an external piezoelectric ceramic sensor is adhered to the bottom of the impact hammer; the external piezoelectric ceramic sensor and the internal piezoelectric ceramic sensor are both connected with the acoustic emission signal amplifier through BNC signal lines. According to the invention, the sensors are embedded in the steel pipe concrete, so that the distance between the transmitting sensor and the receiving sensor is shortened, the condition that sound waves only propagate along the steel pipe and do not pass through the concrete is eliminated, and the accuracy of wave velocity measurement is improved.
Description
Technical Field
The invention belongs to the technical field of nondestructive testing engineering in disaster prevention and reduction, and particularly relates to a device and a method for improving wave velocity measurement accuracy in large-diameter steel pipe concrete grouting compactness detection.
Background
The steel tube concrete is a novel building structure form with good stress performance and construction performance, has good safety, applicability and durability, and is more and more widely applied in the field of civil engineering. In the actual construction process of the steel pipe concrete, due to the influence of various factors such as the technique of constructors and weather, the phenomena of internal cavities, steel pipe wall and concrete separation and the like can occur in the process of pouring the steel pipe concrete, and the phenomena can also be called as defects. The existence of these defects reduces the strength of the steel pipe concrete, seriously threatens the safety of buildings, and is very important for the compactness detection of the steel pipe concrete.
At present, the method for detecting the compactness in the concrete filled steel tube construction process generally comprises the following three methods:
external pipe knocking method: the external pipe knocking method is that a technician knocks the wall of the steel pipe, finds out the position of the steel pipe and the concrete which are separated according to different timbres of sound produced by the steel pipe during knocking, and qualitatively finds out the position of the defect. The method mainly depends on the experience of technicians, is simple and convenient to operate, is widely applied to engineering practice, is a relatively rough detection means, and has the depth within 10cm in the test range. The method can not meet the condition of high engineering detection precision requirement, and is not applicable to the defect knocking rule in the concrete filled steel tube.
An ultrasonic method: the basic principle of ultrasonic method for detecting the defects of the steel pipe concrete is that an ultrasonic excitation signal is sent out by a transmitting transducer at one end of the outer diameter of a steel pipe and is transmitted to a receiving transducer at the other end of the outer diameter of the steel pipe through the steel pipe and the concrete. When the ultrasonic wave encounters an interface formed by various defects in the propagation process, the propagation direction and the propagation path of the ultrasonic wave are changed, the energy of the ultrasonic wave is attenuated at the defects, and the relative change of sound time, sound amplitude and frequency when the ultrasonic wave reaches a receiving transducer is caused. The method is widely applied to the compactness detection of the steel tube concrete arch bridge arch rib and the large-scale steel tube concrete column. The ultrasonic method comprises a butt-measuring method and a pipe-burying method, and the pipe-burying method is mainly applied to large-scale projects. The ultrasonic method has the advantages of strong penetrating power, simple detection equipment, convenient operation, low detection cost and the like. However, the propagation path of the ultrasonic waves in the steel pipe concrete is complicated due to the presence of the steel pipe, and the situation that the ultrasonic waves are completely propagated through the wall of the steel pipe cannot be excluded. When the pipe embedding method is adopted, the acoustic pipe is embedded in advance, the concrete quality of the core area in the steel pipe can be detected only, and the bonding condition of the steel pipe wall and the concrete cannot be detected; to the steel core concrete column that is equipped with interior stiffening ring, can't detect interior stiffening ring department concrete quality, especially can't detect whether porose hole exists under the stiffening ring armpit.
Core drilling and sampling method: and (3) directly drilling a concrete core sample from the structure or the member to be detected by using a concrete core drilling machine to judge the internal defects of the core concrete and the bonding condition of the steel pipe wall and the concrete at the core drilling position. The method has the advantages of visual and reliable detection result. However, core drilling sampling can only reflect the concrete quality in the drilling range, and a large blind area exists. The core drilling method also has the disadvantages of large equipment, labor and time waste and high price. The method is not applicable to the steel tube concrete with large diameter and provided with the inner reinforcing ring. The core drilling sampling method does not belong to nondestructive testing. The method is not suitable for large-scale detection in actual engineering detection.
In addition, the method also comprises an impact echo method, an infrared thermal imaging method and the defect detection of the concrete filled steel tube by using an optical fiber sensing technology, but the method has the defects of insufficient detection precision, low cost performance, small application range and the like.
Disclosure of Invention
The invention aims to provide a device for improving the accuracy of wave velocity measurement in the detection of the grouting compactness of large-diameter concrete-filled steel tubes, so as to solve the problems in the background technology.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a large-diameter steel pipe concrete grouting compactness detection device comprises an upright rod 1, wherein the upright rod 1 is vertically inserted into a steel pipe 4, and a sleeve 2 and a telescopic supporting rod 3 are arranged above the upright rod 1; the outer side of the sleeve 2 is respectively connected with four telescopic supporting rods 3, and the end part of each telescopic supporting rod 3 is fixed on the top wall of the steel pipe 4 through an n-shaped buckle 5; the upper, middle and lower positions of the upright rod 1 are respectively provided with a built-in piezoelectric ceramic sensor 7; the fixed seat 11 is externally sleeved on the top of the upright rod 1, the top of the fixed seat 11 is welded with a horizontal fixed cross rod 12, the cross rod 12 is hinged with a connecting rod 13, the bottom of the connecting rod 13 is connected with an impact hammer 14, and an external piezoelectric ceramic sensor 6 is adhered to the bottom of the impact hammer 14; the external piezoelectric ceramic sensor 6 (signal transmitting end) and the internal piezoelectric ceramic sensor 7 (signal receiving end) are both connected with the acoustic emission signal amplifier through BNC signal wires 9.
The invention also has the following additional technical features:
the technical scheme of the invention is further specifically optimized as follows: the built-in piezoelectric ceramic sensors 7 are connected with the acoustic emission signal amplifier through BNC signal lines 9, the acoustic emission signal amplifier is connected with the full information acoustic emission signal analyzer through signal transmission lines, and the full information acoustic emission signal analyzer is used for collecting and displaying acoustic signals received and amplified by the built-in piezoelectric ceramic sensors 7.
The technical scheme of the invention is further specifically optimized as follows: the upright rod 1 is a straight rod or a group of straight rods with slender light circles, and scales are arranged on the outer side of the upright rod 1; the upright rod 1 has the length of 1.0m and the diameter of 8 mm.
The technical scheme of the invention is further specifically optimized as follows: the outer side of the sleeve 2 is distributed with four screw interfaces, the inner diameter of each screw interface is 10mm, and the screw interfaces are connected with the telescopic supporting rods 3; the sleeve 2 is provided with a pressing adjusting bolt 8 for locking the vertical rod 1; the sleeve 2 has an inner diameter of 9mm, an outer diameter of 15mm and a length of 15 cm.
The technical scheme of the invention is further specifically optimized as follows: the telescopic support rod 3 is respectively connected with four threaded connectors distributed on the outer side of the sleeve 2, the telescopic support rod 3 is connected with the steel pipe 4 through an n-shaped buckle 5, and a fixing bolt 10 for locking the steel pipe 4 is arranged on the n-shaped buckle 5; the outer diameter of the telescopic supporting rod 3 is 10mm, and the length is 80 cm.
The technical scheme of the invention is further specifically optimized as follows: the piezoelectric constant d3 or d31 of the external piezoelectric ceramic sensor 6 (signal transmitting end) and the internal piezoelectric ceramic sensor 7 (signal receiving end) is more than or equal to 120 multiplied by 10-12C/N。
The technical scheme of the invention is further specifically optimized as follows: the built-in piezoelectric ceramic sensor 7 (signal receiving end) comprises an acoustic impedance matching layer and a piezoelectric ceramic piece, wherein the piezoelectric ceramic piece is divided into a positive pole and a negative pole and is connected with a cable in a signal wire through soldering tin; the adhesive for manufacturing the piezoelectric ceramic sheet is a modified 302 acrylate adhesive, and the material coated on the shielding layer is a silver-containing resin composite material.
The technical scheme of the invention is further specifically optimized as follows: BNC signal line 9 includes BNC connector base, overcoat and probe, and BNC signal line 9 comprises two-layer coil inside and outside, and BNC signal line 9 diameter 5mm, length are 2 m.
The technical scheme of the invention is further specifically optimized as follows: the acoustic emission signal amplifier adopts single-ended input, transmission is transmitted through a two-wire system, the gain of a single amplifier is 40db, the size is 80mm multiplied by 50mm multiplied by 23mm, and the bandwidth is 10kHz-2 MHz.
The technical scheme of the invention is further specifically optimized as follows: the full-information acoustic emission signal analyzer is a DS2 series 2-8 channel full-information acoustic emission signal analyzer, a USB3.0 interface is adopted, the continuous data passing rate is greater than 48MB/s, the channel input impedance is 50 omega, a single-end signal input type is adopted, the triggering mode is software triggering, signal threshold triggering and external triggering, and the power supply mode adopts external 220V power supply.
Compared with the prior art, the invention has the advantages that:
the method has the advantages that: according to the invention, the vertical rod 1 adhered with the built-in piezoelectric ceramic sensor 7 is arranged, the vertical rod 1 is inserted into concrete of a steel pipe 4 after grouting, the steel pipe is knocked by a pointed hammer adhered with the external piezoelectric ceramic sensor 6 on the outer side, an acoustic signal is emitted by knocking the side wall of the steel pipe 4, when the acoustic signal reaches the built-in piezoelectric ceramic sensor 7 on the vertical rod 1 through the side wall of the steel pipe 4 and the concrete, the acoustic signal is received, a signal transmitting end and a signal receiving end are simultaneously connected with a full-information acoustic emission signal analyzer through an acoustic emission signal amplifier, and relevant conditions of concrete pouring compactness of the steel pipe 4 are determined by comparing and analyzing relevant parameters such as the first wave arrival time and waveform amplitude of signals of the transmitting end and the receiving end.
The method has the advantages that: compared with the traditional ultrasonic detection methods such as a measurement method and the like, the improved method for embedding the sensor in the concrete of the steel pipe 4 shortens the distance between the transmitting sensor and the receiving sensor, simultaneously eliminates the condition that sound waves only propagate along the steel pipe 4 and do not pass through the concrete, and improves the accuracy of wave velocity measurement. The problem that signal reception is not obvious due to overlarge distance in wave velocity measurement and the problem that a sound wave propagation path is not clear are solved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a three-dimensional schematic view of the present invention.
Fig. 2 is a top view of the present invention.
Fig. 3 is a schematic view of the connection structure of the upright 1, the sleeve 2 and the telescopic supporting rod 3 of the present invention;
FIG. 4 is a schematic view of the connection structure of the steel pipe 4 and the n-type buckle 5 of the present invention;
fig. 5 is a schematic view of the mounting and connecting structure of impact hammer 14 of the present invention;
fig. 6 is a schematic view of the mounting structure of the external piezoceramic sensor 6 according to the present invention.
In the figure: pole setting 1, sleeve 2, telescopic bracing piece 3, steel pipe 4, n type buckle 5, external piezoceramics sensor 6, built-in piezoceramics sensor 7 compresses tightly adjusting bolt 8, BNC signal line 9, fixing bolt 10, fixing base 11, horizontal pole 12, connecting rod 13, striking hammer 14.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings, in order that the present disclosure may be more fully understood and fully conveyed to those skilled in the art. While the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the invention is not limited to the embodiments set forth herein.
A device for improving the accuracy of wave velocity measurement in the detection of the grouting compactness of large-diameter concrete-filled steel tubes comprises an upright rod 1, wherein the upright rod 1 is a straight rod or a group of straight rods with slender smooth circles, and scales are arranged on the outer side of the upright rod 1; each upright rod 1 can be connected with other upright rods 1 end to end so as to be lengthened according to actual conditions until the upright rods are connected to proper lengths;
the upright 1 is vertically inserted into the middle position or other suitable positions in the steel tube 4, and in order to ensure the verticality and stability of the upright 1, the upright 1 is fixed above the upright 1 by a sleeve 2 and a telescopic supporting rod 3.
The inner diameter of the sleeve 2 is larger than the diameter of the upright rod 1, the outer side of the sleeve 2 is respectively connected with four telescopic supporting rods 3, and the end part of each telescopic supporting rod 3 is fixed on the top wall of the steel pipe 4 through an n-shaped buckle 5; the telescopic support rods 3 can be extended or shortened to adjust the length and angle to vertically fix the uprights 1 and sleeves 2 in position.
The built-in piezoelectric ceramic sensors 7 are respectively arranged at the upper, middle and lower positions of the vertical rod 1, and the built-in piezoelectric ceramic sensors 7 are uniformly distributed on the vertical rod 1. An external piezoelectric ceramic sensor 6 is adhered to the bottom of the impact hammer 14. The external piezoelectric ceramic sensor 6 (signal transmitting end) and the internal piezoelectric ceramic sensor 7 (signal receiving end) are both connected with the acoustic emission signal amplifier through BNC signal wires 9. The tip of the impact hammer 14 strikes at the appropriate location on the steel pipe 4, in such a way that the signal is activated. When the sound signal of the external piezoelectric ceramic sensor 6 reaches the internal piezoelectric ceramic sensor 7 on the upright rod 1 through the steel pipe 4 and the concrete, the sound signal is received.
The built-in piezoelectric ceramic sensors 7 are connected with the acoustic emission signal amplifier through BNC signal lines 9, the acoustic emission signal amplifier is connected with the all-information acoustic emission signal analyzer through signal transmission lines, and the all-information acoustic emission signal analyzer is used for collecting and displaying the acoustic signals received and amplified by the built-in piezoelectric ceramic sensors 7. And determining the relevant conditions of the concrete pouring compactness of the steel pipe 4 by comparing and analyzing the relevant parameters such as the first wave arrival time, the waveform amplitude and the like of the transmitting end signal and the receiving end signal.
The upright rod 1 is a single long and thin upright rod 1 with the length of 1.0m and millimeter scales, and the position of the sound sensor embedded in the concrete is determined by recording the scales on the upper edge of the steel pipe 4. The pole setting 1 can be smooth round steel bar or other material of hard material partially, and the end all has the hickey to be connected the extension with other pole settings 1, and 1 diameter 8mm of pole setting.
The sleeve 2 is a round pipe with the inner diameter of 9mm and the outer diameter of 15mm, is made of low-carbon steel, is 15cm long, is smooth on the inner side of the round pipe, is provided with four screw thread interfaces on the outer side, and is provided with the inner diameter of 10mm and used for being connected with the telescopic supporting rod 3. Offer the horizontally screw hole on the sleeve 2, threaded hole is equipped with the internal thread, and threaded hole internal thread wears to be equipped with and compresses tightly adjusting bolt 8, screws up and compresses tightly adjusting bolt 8 and compress tightly pole setting 1 and sleeve 2, and restriction pole setting 1 reciprocates.
The telescopic supporting rod 3 is used for adjusting the position of the steel bar and the height of the sensor. The telescopic support rod 3 is connected with the threaded interface outside the sleeve 2, the outer diameter of the telescopic support rod 3 is 10mm, the length of the telescopic support rod is 80cm, and the slender straight steel is made of steel. Offer the horizontally screw hole on the n type buckle 5, threaded hole is provided with the internal thread, and the screw hole internal thread is worn to be equipped with and is compressed tightly adjusting bolt 8, through screwing up adjusting bolt, fixes the steel pole on steel pipe 4 with the help of n type buckle 5.
The external piezoelectric ceramic sensor 6 (signal transmitting end) and the internal piezoelectric ceramic sensor 7 (signal receiving end) are sensors capable of simultaneously transmitting and receiving acoustic signals, and have the characteristics of being suitable for a narrow space, being convenient for array manufacturing, being ultra-thin, having a high signal-to-noise ratio and having high sensitivity. The piezoelectric constant d3 or d31 of the external piezoelectric ceramic sensor 6 (signal transmitting end) and the internal piezoelectric ceramic sensor 7 (signal receiving end) is more than or equal to 120 multiplied by 10-12C/N。
The built-in piezoelectric ceramic sensor 7 (signal receiving end) comprises a piezoelectric ceramic piece, an acoustic impedance matching layer, a connecting medium, a signal shielding layer and a signal line of the signal shielding layer, wherein the piezoelectric ceramic piece is divided into a positive pole and a negative pole and is connected with a cable in the signal line through soldering tin, the size of the piezoelectric ceramic piece is 5 multiplied by 2mm, 10 multiplied by 2mm, 15 multiplied by 15mm and the like, and the size of the piezoelectric ceramic piece limited by the vertical rod 1 is preferably 5 multiplied by 5mm multiplied by 2 mm. The adhesive for manufacturing the piezoelectric ceramic sheet is a modified 302 acrylate adhesive, and the material coated on the shielding layer is a silver-containing resin composite material.
The built-in piezoelectric ceramic sensor 7 is manufactured by peeling off the outer skin of a BNC signal wire 9 by using a wire stripper, dividing an inner wire and an outer wire, defining the inner wire as a positive electrode, dividing the outer wire into two beams, defining one beam as a negative electrode, and connecting the other beam with a shielding layer. After the signal wire is processed, the electric iron is used for melting soldering tin to firmly connect the anode of the piezoelectric ceramic piece with the anode of the signal wire, and the soldering tin is used for firmly connecting the cathode of the piezoelectric ceramic piece with the cathode of the signal wire. In order to firmly adhere the wire harness and the piezoelectric ceramic piece in the signal wire and ensure the good sealing, the piezoelectric ceramic piece welded with the signal wire is uniformly coated and completely wrapped by using the modified 302 acrylate adhesive. Solidifying and forming the modified 302 acrylate adhesive, dissolving the silver-doped resin composite material by using acetone, coating the molten material on the position of the anode surface of the piezoelectric ceramic by using a cotton swab, closely attaching another outer signal wire to the shielding layer after the coated material is dried in the air, fixing the wire on the sensor by using the modified 302 acrylate adhesive, and tightly wrapping the wire. The function of the shielding layer is to ensure the noise and interference resistance of the sensor body portion.
The BNC signal line 9 is used for ensuring the anti-noise and anti-interference performance in the signal transmission process. The BNC signal wire 9 comprises a BNC connector base, an outer sleeve and a probe, the BNC signal wire 9 consists of an inner layer coil and an outer layer coil, the diameter of the BNC signal wire 9 is 5mm, and the length of the BNC signal wire is selected according to the test condition and is generally 2 m.
Fixing base 11 overcoat is in the top of pole setting 1, and the welding of fixing base 11 top has a horizontal fixed horizontal pole 12, and horizontal pole 12 is connected with connecting rod 13 is articulated, and connecting rod 13 bottom links to each other with striking hammer 14, and connecting rod 13 passes through the stopper restriction angle of lifting up, and striking hammer 14 strikes steel pipe 4 concrete wall and produces the acoustic signal.
The impact hammer 14 is a pointed hammer serving as an excitation end and functioning as a signal emitting end, and has a size of a handle of 20cm long, a handle diameter of about 2cm, a hammer head length of about 10cm, and a weight of about 1.5 kg. The hammer head of the impact hammer 14 needs to be adhered with the manufactured external piezoelectric ceramic sensor 6 at the bottom by using the modified 302 acrylate adhesive, and a signal wire connected with the external piezoelectric ceramic sensor 6 is fixed on the hammer handle. The outer wall of the concrete of the steel pipe 4 is knocked by the sharp head part of the knocking hammer 14, and the sound signal is excited to be sent out.
The acoustic emission signal amplifier is a preamplifier in the monitoring of acoustic emission system. The amplifier is a PXPA preamplifier and is used for amplifying and filtering signals collected by the sensor and improving the signal-to-noise ratio, and the amplifier has the characteristics of small volume, impact resistance, high speed, low noise and good heat dissipation. The acoustic emission signal amplifier adopts single-ended input, transmission is transmitted through a two-wire system, the gain of a single amplifier is 40db, the appearance size is 80 multiplied by 50 multiplied by 23mm, and the bandwidth is 10kHz-2 MHz.
The full-information acoustic emission signal analyzer is a DS2 series 2-8 channel full-information acoustic emission signal analyzer, a USB3.0 interface is adopted, multi-channel synchronous information acquisition can be achieved, the continuous data passing rate is larger than 48MB/s, the channel input impedance is 50 ohms, a single-ended signal input type is adopted, the triggering mode is software triggering, signal threshold triggering and external triggering, and the power supply mode adopts external 220V power supply.
The full-information acoustic emission analyzer is characterized in that acoustic emission signals of the whole experimental process are completely collected, and no data is lost. And acoustic emission parameter extraction conditions such as thresholds of all channels, impact discrimination time, impact locking time and the like can be set more accurately according to the acquired waveforms. Therefore, more accurate acoustic emission parameters can be obtained, and errors caused by setting parameters such as a threshold and the like by experience to extract the acoustic emission parameters are avoided. Meanwhile, the user can select all or part of the waveforms to be derived in a text format or a binary format so as to analyze the waveforms by using tools such as MATLAB and the like.
The full-information acoustic emission signal analyzer needs to be connected with a driver which needs to be installed on a computer, and displays and analyzes the obtained acoustic emission signal through software.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described above with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the above detailed description of the embodiments of the invention presented in the drawings is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. 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.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Claims (10)
1. The utility model provides a closely knit degree detection device of major diameter steel pipe concrete grouting which characterized in that: the device comprises an upright rod 1, wherein the upright rod 1 is vertically inserted into a steel pipe 4, and a sleeve 2 and a telescopic supporting rod 3 are arranged above the upright rod 1; the outer side of the sleeve 2 is respectively connected with four telescopic supporting rods 3, and the end part of each telescopic supporting rod 3 is fixed on the top wall of the steel pipe 4 through an n-shaped buckle 5; the upper, middle and lower positions of the upright rod 1 are respectively provided with a built-in piezoelectric ceramic sensor 7; the fixed seat 11 is externally sleeved on the top of the upright rod 1, the top of the fixed seat 11 is welded with a horizontal fixed cross rod 12, the cross rod 12 is hinged with a connecting rod 13, the bottom of the connecting rod 13 is connected with an impact hammer 14, and an external piezoelectric ceramic sensor 6 is adhered to the bottom of the impact hammer 14; the external piezoelectric ceramic sensor 6 and the internal piezoelectric ceramic sensor 7 are both connected with an acoustic emission signal amplifier through BNC signal wires 9.
2. The device for detecting the grouting compactness of the large-diameter concrete-filled steel tube according to claim 1, characterized in that: the built-in piezoelectric ceramic sensors 7 are connected with the acoustic emission signal amplifier through BNC signal lines 9, the acoustic emission signal amplifier is connected with the all-information acoustic emission signal analyzer through signal transmission lines, and the all-information acoustic emission signal analyzer is used for collecting and displaying the acoustic signals received and amplified by the built-in piezoelectric ceramic sensors 7.
3. The device for detecting the grouting compactness of the large-diameter concrete-filled steel tube according to claim 1, wherein the upright rod 1 is a straight rod or a group of straight rods with slender smooth circles, and scales are arranged on the outer side of the upright rod 1; the upright rod 1 is 1.0m long and 8mm in diameter.
4. The device for detecting the grouting compactness of the large-diameter concrete-filled steel tube according to claim 1, wherein four screw joints are distributed on the outer side of the sleeve 2, the inner diameter of each screw joint is 10mm, and the sleeve is connected with the telescopic supporting rod 3; the sleeve 2 is provided with a pressing adjusting bolt 8 for locking the vertical rod 1; the sleeve 2 has an inner diameter of 9mm, an outer diameter of 15mm and a length of 15 cm.
5. The device for detecting the grouting compactness of the large-diameter concrete-filled steel tube according to claim 1, wherein the telescopic supporting rods 3 are respectively connected with four screw interfaces distributed on the outer side of the sleeve 2, the telescopic supporting rods 3 are connected with the steel tube 4 through n-shaped buckles 5, and fixing bolts 10 are arranged on the n-shaped buckles 5 and used for locking the steel tube 4; the outer diameter of the telescopic supporting rod 3 is 10mm, and the length is 80 cm.
6. The device for detecting the grouting compactness of the large-diameter concrete-filled steel tube according to claim 1, wherein the piezoelectric constants d3 or d31 of the external piezoelectric ceramic sensor 6 and the internal piezoelectric ceramic sensor 7 are more than or equal to 120 x 10-12C/N。
7. The device for detecting the grouting compactness of the large-diameter concrete-filled steel tube according to claim 1, wherein the built-in piezoelectric ceramic sensor 7 comprises an acoustic impedance matching layer and a piezoelectric ceramic piece, wherein the piezoelectric ceramic piece is divided into a positive pole and a negative pole and is connected with a cable in a signal wire through soldering tin; the adhesive for manufacturing the piezoelectric ceramic sheet is a modified 302 acrylate adhesive, and the material coated on the shielding layer is a silver-containing resin composite material.
8. The concrete-filled compactness detection device for the large-diameter steel tube according to claim 1, wherein the BNC signal wire 9 comprises a BNC connector base, an outer sleeve and a probe, the BNC signal wire 9 is composed of an inner layer coil and an outer layer coil, and the BNC signal wire 9 has a diameter of 5mm and a length of 2 m.
9. The apparatus for detecting grouting compactness of steel pipe concrete with large diameter according to claim 2, wherein the acoustic emission signal amplifier adopts single end input, transmission is carried out through two-wire system, the gain of the single amplifier is 40db, the size is 80mm x 50mm x 23mm, and the bandwidth is 10kHz-2 MHz.
10. The device for detecting the grouting compactness of the large-diameter concrete-filled steel tube according to claim 2, wherein the full-information acoustic emission signal analyzer is a DS2 series 2-8 channel full-information acoustic emission signal analyzer, a USB3.0 interface is adopted, the continuous data throughput rate is greater than 48MB/s, the channel input impedance is 50 Ω, a single-ended signal input type is adopted, the triggering mode is software triggering, signal threshold triggering and external triggering, and the power supply mode adopts external 220V power supply.
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| CN117554487A (en) * | 2024-01-10 | 2024-02-13 | 中建海龙科技有限公司 | Wall structure internal damage detection method and system |
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| CN117554487A (en) * | 2024-01-10 | 2024-02-13 | 中建海龙科技有限公司 | Wall structure internal damage detection method and system |
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