CN113237582A - Wall internal stress detection method and detection system for engineering acceptance - Google Patents
Wall internal stress detection method and detection system for engineering acceptance Download PDFInfo
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- CN113237582A CN113237582A CN202110398568.3A CN202110398568A CN113237582A CN 113237582 A CN113237582 A CN 113237582A CN 202110398568 A CN202110398568 A CN 202110398568A CN 113237582 A CN113237582 A CN 113237582A
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- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/25—Measuring force or stress, in general using wave or particle radiation, e.g. X-rays, microwaves, neutrons
- G01L1/255—Measuring force or stress, in general using wave or particle radiation, e.g. X-rays, microwaves, neutrons using acoustic waves, or acoustic emission
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B17/00—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B17/00—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations
- G01B17/04—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations for measuring the deformation in a solid, e.g. by vibrating string
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Abstract
The invention relates to a wall internal stress detection system for engineering acceptance, which belongs to the field of engineering detection and comprises an ultrasonic module, an embedded sensor module and an analysis module, wherein the ultrasonic module comprises an ultrasonic controller and three probes; the embedded sensor module comprises an embedded sensor and a sensor data collector; the analysis module comprises a data processor and a portable computer; a strain gauge is adhered between fixed discs arranged on the embedded sensor; the strain gauge is sequentially connected with the sensor data collector, the data processor and the portable computer, and the portable computer obtains the data of the embedded sensor in real time; the distance between the strain gauges is equal; establishing association between ultrasonic waves and strain by combining external ultrasonic detection, and estimating internal stress of the wall by measuring the ultrasonic waves at other positions; the position of the sensor is determined firstly during ultrasonic detection, then the specific position of the strain gauge is determined, and the crack of the wall surface is determined, so that the measurement is more accurate, and the measurement error is avoided.
Description
Technical Field
The invention relates to the field of engineering detection, in particular to a wall internal stress detection method and system for engineering acceptance.
Background
The internal stress means a stress remaining in the object after the external load is removed. It is caused by the non-uniform volume change of macroscopic or microscopic tissues in the material.
The internal stress of the wall body is generally caused by the change of temperature, humidity and the like, especially in the engineering which is just built, the internal stress formed by air drying in the wall body can be completely released for many years, and meanwhile, new internal stress can be formed in the wall body due to the change of seasons, and the internal stress needs to be monitored when the engineering is checked and accepted so as to avoid potential safety hazards.
In the prior art, generally, a piezoelectric sensor is embedded in a wall body for monitoring internal stress, the cost of the piezoelectric sensor is high, comprehensive monitoring is difficult to carry out generally, and only stress change near the sensor can be obtained. The prior art also has a method for detecting internal stress and defects by using ultrasonic, but the real internal stress of a wall body is difficult to show by pure ultrasonic detection, and if an external load mode is adopted, the load simulation of the wall body is greatly different from the real wall body stress.
Disclosure of Invention
In view of the above, in order to solve the above problems, the present invention provides a wall internal stress detection system and a wall internal stress detection method for engineering acceptance. The strain gauges of the invention are related and have equal intervals; the correlation between the ultrasonic waves and the strain can be established by combining external ultrasonic detection, so that the internal stress of the wall body can be estimated by only measuring the ultrasonic waves at other positions; when ultrasonic detection is carried out, the position of the sensor is determined by C scanning, then the specific position of the strain gauge is determined by A scanning, and the crack of the wall surface is determined by combining an oblique probe, so that the measurement is more accurate, and the measurement error is avoided.
The invention is realized by the following technical scheme:
a wall internal stress detection system for engineering acceptance comprises an ultrasonic module, an embedded sensor module and an analysis module;
the ultrasonic module comprises an ultrasonic controller, a C scanning probe, an A scanning probe and an oblique probe; the embedded sensor module comprises an embedded sensor and a sensor data collector; the analysis module comprises a data processor and a portable computer;
the embedded sensor is provided with a central rod 1 and a plurality of fixed disks 2, and the fixed disks 2 penetrate through the central rod 1; a strain gauge 3 is adhered on the surface of the central rod 1 between the fixed discs 2; the strain gauge 3 is connected with a sensor data collector, the sensor data collector is connected with a data processor, and the data processor is connected with a portable computer, so that the portable computer can obtain the data of the embedded sensor in real time;
the embedded sensor is placed in a concrete wall, the central rod 1 is arranged in parallel with the wall, and the distances from the central rod 1 to the two sides of the wall are equal;
the C scanning probe, the A scanning probe and the oblique probe are all connected to an ultrasonic controller, the ultrasonic controller is connected with a data processor, and the ultrasonic controller sends collected data of the C scanning probe, the A scanning probe and the oblique probe to a portable computer;
the scanning probe C is used for determining the position of the embedded sensor in the wall body, the scanning probe A is used for vertically measuring the ultrasonic signal of the wall body, and the inclined probe is used for transmitting the ultrasonic signal which is obliquely injected into the wall body and receiving the ultrasonic signal which is obliquely injected out of the wall body.
Preferably, the number of the fixed disks 2 is at least 6, the distance between every two adjacent fixed disks 2 is equal, and the fixed disks 2 and the central rod 1 are fixedly arranged;
preferably, the section of the central rod 1 is square with round corners, the length of the diagonal line is S, and the distance between the opposite sides is L; the strain gauge 3 is adhered to the center of each square side, the maximum thickness of the strain gauge 3 is (S-L)/2, and the length of the strain gauge 3 is less than L/2; and the length of the straight line part of the side length of the round corner square is more than L/2.
Preferably, the probing frequency ranges of the C-scan probe, the a-scan probe and the tilt probe are the same.
A method for detecting internal stress by using a wall internal stress detection system for engineering acceptance comprises the following steps:
1) embedding an embedded sensor: before a wall body is poured, fixing fixed disks 2 are fixedly connected with a central rod 1, the equal spacing between the adjacent fixed disks 2 is ensured, then strain gauges 3 are attached to the surface of the central rod 1, 4 strain gauges 3 are attached between the adjacent fixed disks 2, and 1 strain gauge is attached to each surface of the central rod 1; then, the central rod 1 is placed at a position to be poured, the central axis of the central rod 1 is adjusted to be parallel to a wall surface to be poured, and then the plane of the surface of the central rod 1 is adjusted to be parallel to the wall surface to be poured; then arranging the signal connecting wires, placing the wire ends of the signal connecting wires outside the pouring wall, and then pouring the wall, wherein the pouring is to ensure that the position of the central rod 1 is not changed;
2) positioning the sensor position:
after drying the belt concrete, connecting a stress detection system so that the embedded sensor is connected to a sensor data collector; starting the C scanning probe, controlling the C scanning probe to scan along the wall surface, observing a scanning result on the portable computer, and marking positions of the fixed disc 2 and the central rod 1 after scanning; continuing to scan until the position of the whole embedded sensor is completely marked;
3) collecting sensor data:
the portable computer collects the data of the strain gauge 3, marks the data of the strain gauge 3 and the corresponding position of the strain gauge 3 on the wall surface, marks the strain detection value of the strain gauge 3, and stores the position and the strain detection value of the strain gauge 3 in the portable computer;
4) ultrasonic detection:
4-1) performing wall surface ultrasonic detection by using an inclined probe, collecting data of the inclined probe by using a portable computer, and analyzing and obtaining the position and the width of a crack in the wall surface;
4-2) carrying out ultrasonic detection on the wall surface by using an A scanning probe, aligning the A scanning probe to the position of the strain gauge 3 in the wall body for detection, observing the value of the strain gauge 3 in real time, indicating that the A scanning probe is aligned to the strain gauge 3 when the numerical fluctuation of the strain gauge 3 is maximum, and then marking the position of each strain gauge 3 in detail; then, scanning the A scanning probe along the connecting line between the strain gauges 3, and recording the ultrasonic sound velocity change on the connecting line between the adjacent fixed disks 2;
4-3) carrying out operations from 4-1) to 4-2) on both sides of the wall body, removing A scanning sound velocity data of crack positions in the wall body after measurement, then averaging sound velocities of other positions between adjacent fixed disks 2, and establishing a correlation model with strain detection values of the strain gauges 3, wherein the input of the correlation model is the sound velocity, and the output is the strain detection values of the strain gauges 3;
4-4) scanning all the positions of the whole wall surface A to obtain sound velocities of all the positions, and then obtaining strain detection values of all the positions of the whole wall surface through a correlation model; a two-dimensional model of a wall surface is established in a portable computer, then strain detection values are input to corresponding positions of the two-dimensional model, and different colors are used for representing the sizes of different strain detection values.
Preferably, a threshold range of the strain detection value is input into the computer in advance, and after the strain detection value of the whole wall surface is obtained through calculation, if the strain detection value in a certain area of the wall surface exceeds the threshold range, the area is subjected to unqualified marking;
after the steps 1) to 4) are finished on one wall, measuring once at the same position of the same building at intervals of 3 days, recording the temperature and the temperature during measurement, and after measuring more than 20 times, establishing a change rule of the strain detection value along with the time and the temperature in a computer.
The invention has the beneficial effects that:
the invention designs a new strain gauge sensor, which is different from the traditional strain gauge setting method, the strain gauges of the invention are related and have equal distance; the correlation between the ultrasonic waves and the strain can be established by combining external ultrasonic detection, so that the internal stress of the wall body can be estimated by only measuring the ultrasonic waves at other positions; when ultrasonic detection is carried out, the position of the sensor is determined by C scanning, then the specific position of the strain gauge is determined by A scanning, and the crack of the wall surface is determined by combining an oblique probe, so that the measurement is more accurate, and the measurement error is avoided.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
FIG. 1 is a schematic structural diagram of an embedded sensor according to the present invention; a is a whole schematic diagram, and b is a partial schematic diagram;
in the figure: the device comprises a central rod 1, a fixed disc 2 and a strain gauge 3;
FIG. 2 is a schematic view of ultrasonic testing according to the present invention;
FIG. 3 is a schematic structural diagram of the apparatus system of the present invention;
FIG. 4 is a flow chart of the steps of the measurement method of the present invention.
Detailed Description
The following embodiments are only used for illustrating the technical solutions of the present invention more clearly, and therefore, the following embodiments are only used as examples, and the protection scope of the present invention is not limited thereby.
It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.
Example 1:
a wall internal stress detection system for engineering acceptance comprises an ultrasonic module, an embedded sensor module and an analysis module;
the ultrasonic module comprises an ultrasonic controller, a C scanning probe, an A scanning probe and an oblique probe; the embedded sensor module comprises an embedded sensor and a sensor data collector; the analysis module comprises a data processor and a portable computer;
the embedded sensor is provided with a central rod 1 and a plurality of fixed disks 2, and the fixed disks 2 penetrate through the central rod 1; a strain gauge 3 is adhered on the surface of the central rod 1 between the fixed discs 2; the strain gauge 3 is connected with a sensor data collector, the sensor data collector is connected with a data processor, and the data processor is connected with a portable computer, so that the portable computer can obtain the data of the embedded sensor in real time;
the embedded sensor is placed in a concrete wall, the central rod 1 is arranged in parallel with the wall, and the distances from the central rod 1 to the two sides of the wall are equal;
the C scanning probe, the A scanning probe and the oblique probe are all connected to an ultrasonic controller, the ultrasonic controller is connected with a data processor, and the ultrasonic controller sends collected data of the C scanning probe, the A scanning probe and the oblique probe to a portable computer;
the scanning probe C is used for determining the position of the embedded sensor in the wall body, the scanning probe A is used for vertically measuring the ultrasonic signal of the wall body, and the inclined probe is used for transmitting the ultrasonic signal which is obliquely injected into the wall body and receiving the ultrasonic signal which is obliquely injected out of the wall body.
The number of the fixed disks 2 is at least 6, the distances between the adjacent fixed disks 2 are equal, and the fixed disks 2 are fixedly arranged with the central rod 1;
the section of the central rod 1 is square with round corners, the length of the diagonal line is S, and the distance between opposite sides is L; the strain gauge 3 is adhered to the center of each square side, the maximum thickness of the strain gauge 3 is (S-L)/2, and the length of the strain gauge 3 is less than L/2; and the length of the straight line part of the side length of the round corner square is more than L/2.
The detection frequency ranges of the C scanning probe, the A scanning probe and the oblique probe are the same.
Example 2:
a method for detecting internal stress by using a wall internal stress detection system for engineering acceptance comprises the following steps:
1) embedding an embedded sensor: before a wall body is poured, fixing fixed disks 2 are fixedly connected with a central rod 1, the equal spacing between the adjacent fixed disks 2 is ensured, then strain gauges 3 are attached to the surface of the central rod 1, 4 strain gauges 3 are attached between the adjacent fixed disks 2, and 1 strain gauge is attached to each surface of the central rod 1; then, the central rod 1 is placed at a position to be poured, the central axis of the central rod 1 is adjusted to be parallel to a wall surface to be poured, and then the plane of the surface of the central rod 1 is adjusted to be parallel to the wall surface to be poured; then arranging the signal connecting wires, placing the wire ends of the signal connecting wires outside the pouring wall, and then pouring the wall, wherein the pouring is to ensure that the position of the central rod 1 is not changed;
2) positioning the sensor position:
after the belt concrete is dried, connecting a stress detection system so that the embedded sensor is connected to a sensor data collector; starting the C scanning probe, controlling the C scanning probe to scan along the wall surface, observing a scanning result on the portable computer, and marking positions of the fixed disc 2 and the central rod 1 after scanning; continuing to scan until the position of the whole embedded sensor is completely marked;
3) collecting sensor data:
the portable computer collects the data of the strain gauge 3, marks the data of the strain gauge 3 and the corresponding position of the strain gauge 3 on the wall surface, marks the strain detection value of the strain gauge 3, and stores the position and the strain detection value of the strain gauge 3 in the portable computer;
4) ultrasonic detection:
4-1) performing wall surface ultrasonic detection by using an inclined probe, collecting data of the inclined probe by using a portable computer, and analyzing and obtaining the position and the width of a crack in the wall surface;
4-2) carrying out ultrasonic detection on the wall surface by using an A scanning probe, aligning the A scanning probe to the position of the strain gauge 3 in the wall body for detection, observing the value of the strain gauge 3 in real time, indicating that the A scanning probe is aligned to the strain gauge 3 when the numerical fluctuation of the strain gauge 3 is maximum, and then marking the position of each strain gauge 3 in detail; then, scanning the A scanning probe along the connecting line between the strain gauges 3, and recording the ultrasonic sound velocity change on the connecting line between the adjacent fixed disks 2;
4-3) carrying out operations from 4-1) to 4-2) on both sides of the wall body, removing A scanning sound velocity data of crack positions in the wall body after measurement, then averaging sound velocities of other positions between adjacent fixed disks 2, and establishing a correlation model with strain detection values of the strain gauges 3, wherein the input of the correlation model is the sound velocity, and the output is the strain detection values of the strain gauges 3;
4-4) scanning all the positions of the whole wall surface A to obtain sound velocities of all the positions, and then obtaining strain detection values of all the positions of the whole wall surface through a correlation model; a two-dimensional model of a wall surface is established in a portable computer, then strain detection values are input to corresponding positions of the two-dimensional model, and different colors are used for representing the sizes of different strain detection values.
Inputting a threshold range of a strain detection value in a computer in advance, and after the strain detection value of the whole wall surface is obtained through calculation, if the strain detection value in a certain area of the wall surface exceeds the threshold range, performing unqualified marking on the area;
after the steps 1) to 4) are finished on one wall, measuring once at the same position of the same building at intervals of 3 days, recording the temperature and the temperature during measurement, and after measuring more than 20 times, establishing a change rule of the strain detection value along with the time and the temperature in a computer.
Example 3:
the method for establishing the sound velocity strain detection value correlation model comprises the following steps:
firstly, sequencing the strain detection values facing the wall surface according to the sizes, wherein if 10 fixed disks are arranged, the corresponding strain detection values facing the wall surface should be 9 multiplied by 2 to 18; to obtain F1 to F18;
calculating the average sound velocity values of the 18 positions, measuring 10 sound velocity values between adjacent fixed disks, increasing the distance between sound velocity measurement positions according to the distance from the strain gauge, and then averaging the measured 10 sound velocity values; to obtain Q1 to Q18;
then drawing a standard curve, wherein the abscissa is sound velocity, and the ordinate is a strain detection value, so that a correlation model of the strain detection value and the sound velocity facing the wall surface is established;
then, recording the strain detection values of the strain gauges perpendicular to the wall surface, wherein if 10 fixed discs are arranged, the strain detection values of the strain gauges perpendicular to the wall surface should be 9 × 2 to 18; to give E1 to E18;
then drawing a vertical line at the position of the strain gauge along a connecting line of the strain gauge, then measuring the sound velocity on the vertical line, measuring 10 sound velocity values between adjacent fixed disks, wherein the distance between the sound velocity measurement positions is larger as the distance from the strain gauge is farther, and then averaging the measured 10 sound velocity values; to obtain P1-P18;
then drawing a standard curve, wherein the abscissa is sound velocity, and the ordinate is a strain detection value, so that a correlation model of the strain detection value and the sound velocity perpendicular to the wall surface is established;
the model relating the strain detection value and the sound velocity toward the wall surface and the model relating the strain detection value and the sound velocity perpendicular to the wall surface can be directly obtained from the sound velocity, and the obtained results can be directly displayed on the portable computer and recorded.
The position and the width of the crack measured by the inclined probe are also displayed on a computer, and the crack can be detected by adopting a measuring method in the prior art. The strain gauges are piezoelectric strain gauges which are calibrated using an external load prior to being embedded.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (6)
1. The system for detecting the internal stress of the wall for engineering acceptance is characterized by comprising an ultrasonic module, an embedded sensor module and an analysis module; the method is characterized in that:
the ultrasonic module comprises an ultrasonic controller, a C scanning probe, an A scanning probe and an oblique probe; the embedded sensor module comprises an embedded sensor and a sensor data collector; the analysis module comprises a data processor and a portable computer;
the embedded sensor is provided with a central rod (1) and a plurality of fixed disks (2), and the fixed disks (2) penetrate through the central rod (1); a strain gauge (3) is stuck on the surface of the central rod (1) between the fixed disks (2); the strain gauge (3) is connected with a sensor data collector, the sensor data collector is connected with a data processor, and the data processor is connected with the portable computer, so that the portable computer can obtain the data of the embedded sensor in real time;
the embedded sensor is placed in a concrete wall, the central rod (1) is arranged in parallel with the wall, and the distance between the central rod (1) and the two sides of the wall is equal;
the C scanning probe, the A scanning probe and the oblique probe are all connected to an ultrasonic controller, the ultrasonic controller is connected with a data processor, and the ultrasonic controller sends collected data of the C scanning probe, the A scanning probe and the oblique probe to a portable computer;
the scanning probe C is used for determining the position of the embedded sensor in the wall body, the scanning probe A is used for vertically measuring the ultrasonic signal of the wall body, and the inclined probe is used for transmitting the ultrasonic signal obliquely transmitted into the wall body and receiving the ultrasonic signal obliquely transmitted out of the wall body.
2. The system for detecting the internal stress of the wall for engineering acceptance according to claim 1, wherein the number of the fixed disks (2) is at least 6, the distances between the adjacent fixed disks (2) are equal, and the fixed disks (2) and the central rod (1) are fixedly arranged.
3. The system for detecting the internal stress of the wall body for engineering acceptance according to claim 1, characterized in that the section of the center rod (1) is square with rounded corners, the length of the diagonal is S, and the distance between the opposite sides is L; the strain gauge (3) is adhered to the center of each square side, the maximum thickness of the strain gauge (3) is (S-L)/2, and the length of the strain gauge (3) is less than L/2; and the length of the straight line part of the side length of the round corner square is more than L/2.
4. The system for detecting the stress in the wall body for engineering acceptance according to claim 1, wherein the detection frequency ranges of the C scanning probe, the A scanning probe and the oblique probe are the same.
5. A method for internal stress detection by using the internal stress detection system for a wall for engineering acceptance according to any one of claims 1 to 4, comprising the steps of:
1) embedding an embedded sensor: the method comprises the following steps that fixed discs (2) are fixedly connected with a central rod (1) before a wall body is poured, the equal distance between every two adjacent fixed discs (2) is guaranteed, strain gauges (3) are attached to the surface of the central rod (1), 4 strain gauges (3) are attached between every two adjacent fixed discs (2), and the number of each surface of the central rod (1) is 1; then, the central rod (1) is placed at a position to be poured, the central axis of the central rod (1) is adjusted to be parallel to a wall surface to be poured, and then the plane of the surface of the central rod (1) is adjusted to be parallel to the wall surface to be poured; arranging the signal connecting wires, placing the wire ends of the signal connecting wires outside the pouring wall, and then pouring the wall, wherein the pouring is to ensure that the position of the central rod (1) is not changed;
2) positioning the sensor position:
after the concrete is dried, connecting a stress detection system to connect the embedded sensor to a sensor data collector; starting the C scanning probe, controlling the C scanning probe to scan along the wall surface, observing a scanning result on the portable computer, and marking positions of the fixed disc (2) and the central rod (1) after scanning; continuing to scan until the position of the whole embedded sensor is completely marked;
3) collecting sensor data:
the portable computer collects the data of the strain gauge (3), marks the data of the strain gauge (3) and the corresponding position of the position on the wall surface according to the data of the strain gauge (3), marks the content as the strain detection value of the strain gauge (3), and stores the position and the strain detection value of the strain gauge (3) in the portable computer;
4) ultrasonic detection:
4-1) performing wall surface ultrasonic detection by using an inclined probe, collecting data of the inclined probe by using a portable computer, and analyzing and obtaining the position and the width of a crack in the wall surface;
4-2) carrying out ultrasonic detection on the wall surface by using an A scanning probe, aligning the A scanning probe to the position of the strain gauge (3) in the wall body for detection, observing the value of the strain gauge (3) in real time, indicating that the A scanning probe is aligned to the strain gauge (3) when the numerical fluctuation of the strain gauge (3) is maximum, and then marking the position of each strain gauge (3) in detail; then, scanning the A scanning probe along the connecting line between the strain gauges (3) and recording the ultrasonic sound velocity change on the connecting line between the adjacent fixed disks (2);
4-3) carrying out operations from 4-1) to 4-2) on both sides of the wall body, removing A scanning sound velocity data of crack positions in the wall body after measurement, then averaging sound velocities of other positions between adjacent fixed disks (2), and establishing a correlation model with strain detection values of the strain gauges (3), wherein the input of the correlation model is sound velocity and the output of the correlation model is the strain detection values of the strain gauges (3);
4-4) scanning all the positions of the whole wall surface A to obtain sound velocities of all the positions, and then obtaining strain detection values of all the positions of the whole wall surface through a correlation model; a two-dimensional model of a wall surface is established in a portable computer, then strain detection values are input to corresponding positions of the two-dimensional model, and different colors are used for representing the sizes of different strain detection values.
6. The internal stress detection method according to claim 5, wherein a threshold range of the strain detection values is inputted into the computer in advance, and when the strain detection values of the entire wall surface are calculated, if the strain detection values in a certain area of the wall surface exceed the threshold range, the area is subjected to unqualified marking; after the steps 1) to 4) are finished on one wall, measuring once at the same position of the same building at intervals of 3 days, recording the temperature and the temperature during measurement, and after measuring more than 20 times, establishing a change rule of the strain detection value along with the time and the temperature in a computer.
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| CN113916408A (en) * | 2021-08-23 | 2022-01-11 | 中建三局第三建设工程有限责任公司 | Method for measuring internal stress of concrete structure |
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| CN113916408B (en) * | 2021-08-23 | 2023-09-22 | 中建三局第三建设工程有限责任公司 | Method for measuring internal stress of concrete structure |
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