CN109186446B - Crack growth detector and crack growth detection method - Google Patents
Crack growth detector and crack growth detection method Download PDFInfo
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- CN109186446B CN109186446B CN201811068295.0A CN201811068295A CN109186446B CN 109186446 B CN109186446 B CN 109186446B CN 201811068295 A CN201811068295 A CN 201811068295A CN 109186446 B CN109186446 B CN 109186446B
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- crack
- strain gauge
- resistance strain
- crack growth
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- 238000001514 detection method Methods 0.000 title claims abstract description 17
- 230000008859 change Effects 0.000 claims abstract description 6
- 239000002390 adhesive tape Substances 0.000 claims description 14
- 229920006335 epoxy glue Polymers 0.000 claims description 7
- 230000008439 repair process Effects 0.000 claims description 4
- 230000007423 decrease Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 claims description 2
- 238000001125 extrusion Methods 0.000 claims 1
- 238000012544 monitoring process Methods 0.000 abstract description 6
- 238000000034 method Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 239000003292 glue Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
- G01B7/18—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge using change in resistance
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The invention discloses a crack expansion detector and a crack expansion detection method. The crack growth detector includes: the device comprises a shell, a signal transmitter, a flexible resistance strain gauge and a control unit, wherein an object accommodating space is arranged in the shell, an extending outlet is formed in the bottom surface of the shell, and a current sensor, a signal transmitter, a flexible resistance strain gauge and the control unit are arranged in the shell; the flexible resistance strain gauge is electrically connected to the current sensor, the control unit is electrically connected to the current sensor and the signal transmitter, the flexible resistance strain gauge can be inserted into a crack of a concrete building through the extending opening, and the signal transmitter sends the change of the internal stress value of the crack caused by the flexible resistance strain gauge to the server through the base station to realize remote monitoring. The invention can remotely monitor the repaired harmful cracks on the concrete building in real time, can timely treat the danger caused by the harmful cracks, reduces the field workload and can maximally ensure the safety of the concrete building.
Description
Technical Field
The invention belongs to the technical field of electronics and relates to a data transmission method which belongs to the field of communication, in particular to monitoring equipment and a detection method for repairing and subsequently expanding concrete harmful cracks.
Background
In the field of large-scale concrete construction, because of long-term loading after the building is built, the surface of the concrete construction is easy to crack, the crack is harmful, epoxy resin materials are usually adopted for repairing the crack in a glue sealing way for the damaged crack, the crack is filled with glue melted by heating under practical high pressure, the crack is repaired after the glue is solidified, but the crack cannot be continuously expanded and then is dangerous, the crack on the surface of the building is required to be inspected on a regular basis by people to a working site, and the problems of low efficiency, poor timely accuracy and high site cost exist in a manual inspection mode.
Disclosure of Invention
The invention aims to remotely monitor the subsequent expansion of the harmful cracks on the surface of the repaired concrete building in real time, take emergency measures on the danger caused by the cracks in time and ensure the safety of personnel.
To achieve the above object, according to an aspect of the present invention, there is provided a crack growth detector comprising: the device comprises a shell, wherein an object placing space is arranged in the shell, an extending outlet is arranged on the bottom surface of the shell, and a current sensor, a signal transmitter, a flexible resistance strain gauge and a control unit are arranged in the shell;
the flexible resistance strain gauge is electrically connected to the current sensor, the control unit is electrically connected to the current sensor and the signal transmitter, and the flexible resistance strain gauge can be inserted into the crack through the extending opening.
Preferably, a server is also included, the server being communicatively coupled to the signal transmitter.
Preferably, the device further comprises a power supply unit, wherein the power supply unit is electrically connected with the signal transmitter and the control unit.
Preferably, the solar panel is further included, and the solar panel is electrically connected to the power supply unit.
Preferably, a groove is formed in one side of the shell, the solar panel is arranged in the groove, and the solar panel is electrically connected to the power supply unit.
Preferably, the device further comprises a fixing lug and a double faced adhesive tape, wherein one side of the double faced adhesive tape is attached to the bottom surface of the shell, and the shell is fixed on the surface to be detected through the double faced adhesive tape and the fixing lug.
Preferably, the flexible resistance strain gauge is electrically connected to the current sensor through a flexible flat cable.
According to another aspect of the present invention, there is provided a crack growth detection method including:
inserting the flexible resistance strain gauge into the crack, and repairing the crack;
detecting current intensity information through a current sensor;
when the current intensity decreases, crack growth is determined.
Preferably, when the current intensity is reduced, determining crack propagation includes: the server sets a current threshold;
detecting current intensity information through a current sensor, and sending the current intensity information to a server through a signal transmitter;
and judging crack propagation when the current intensity received by the server is lower than the current threshold value.
Preferably, the method further comprises: after repairing the crack, detecting current intensity information by a current sensor;
the server receives the current intensity information;
and when the current intensity is lower than the current threshold value, judging that crack repair is unsuccessful.
The invention has the beneficial effects that: the crack expansion detector provided by the invention creates a new detection device and a new detection method for detecting the harmful cracks of the concrete building, can remotely monitor the repaired harmful cracks on the concrete building in real time, can timely treat the danger caused by the harmful cracks, reduces the field workload, and can maximally ensure the safety of the concrete building.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings.
Fig. 1 shows a schematic view of the overall top of the present invention.
Fig. 2 shows a schematic view of the internal structure of the internal components according to the present invention.
Fig. 3 shows a schematic overall bottom view according to the invention.
FIG. 4 shows an instrument installation schematic according to one embodiment of the invention.
Fig. 5 shows a schematic diagram of the measurement principle according to an embodiment of the invention.
Reference numerals illustrate:
1. a solar panel; 2. a housing; 3. fixing the earhole by a screw; 4. a bottom plate; 5. a power transmission line; 6. a storage battery; 7. a single chip microcomputer; 8. an outlet; 9. a signal transmitter; 10. a current sensor; 11. a flexible flat cable; 12. a flexible resistance strain gauge; 13. double faced adhesive tape; 14. building a wall; 15. a crack detection instrument; 16. a fixing screw; 17. cracks of the building; 18. and (3) epoxy glue.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the preferred embodiments of the present invention are described below, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
A crack growth detector according to the present invention includes:
the casing is internally provided with a storage space, the bottom surface of the casing is provided with an extension port, and a current sensor, a signal transmitter, a flexible resistance strain gauge and a control unit are arranged in the casing.
The flexible resistance strain gauge is electrically connected to the current sensor, the control unit is electrically connected to the current sensor and the signal transmitter, and the flexible resistance strain gauge can be inserted into the crack through the extending opening.
Specifically, the flexible resistance strain gauge is thin in shape and convenient to insert into a crack, and has the characteristics that the resistance value changes along with the change of the pressure in the crack, the change of the current value is caused by the constant voltage of the power supply unit, the control unit can transmit data to the server through the signal transmitter after collecting the change of the current through the current sensor, and monitoring personnel can timely and accurately receive the change information of the crack.
In one example, the server is communicatively coupled to the signal transmitter.
In one example, the portable electronic device further comprises a power supply unit, wherein the power supply unit is electrically connected to the signal transmitter and the control unit.
In one example, the solar panel is further included, and the solar panel is electrically connected to the power supply unit.
Specifically, the power supply unit is composed of a solar panel and a storage battery, so that long-term power supply is ensured, and meanwhile, a battery or an external power supply is not required to be replaced, so that the installation at any position is facilitated.
In one example, a groove is formed in one side of the housing, and the solar panel is disposed in the groove and electrically connected to the power supply unit.
Specifically, the shell comprises a shell and a bottom plate, an opening reserved for extending the flexible resistance strain gauge is formed in the bottom plate, the resistance strain gauge is conveniently extended and inserted into the crack, and a groove is formed in the top of the shell, so that the solar panel can be conveniently installed.
In one example, the device further comprises a fixing lug and double-sided adhesive tape, one side of the double-sided adhesive tape is attached to the bottom surface of the shell, and the shell is fixed on the surface to be detected through the double-sided adhesive tape and the fixing lug.
Specifically, the bottom plate is provided with a fixing screw ear hole and double faced adhesive tape, and the fixing ear is fixed on the surface to be detected through the screw and the double faced adhesive tape, so that the whole body is firmer and more reliable.
In one example, the flexible resistive strain gage is electrically connected to the current sensor through a flexible flat cable.
In one example, a crack growth detection method includes:
inserting the flexible resistance strain gauge into the crack, and repairing the crack; detecting current intensity information through a current sensor; when the current intensity information is lowered, crack growth is determined.
Setting a current threshold at a server; detecting current intensity information through a current sensor, and sending the current intensity information to a server through a signal transmitter; and judging crack propagation when the current intensity information received by the server is lower than the current threshold value.
After repairing the crack, detecting current intensity information by a current sensor; the server receives the current intensity information; when the current intensity information is lower than the current threshold value, judging that crack repair is unsuccessful; and when the current intensity information is higher than the current threshold value, judging that the crack repair is successful.
Examples:
a top plan view and a bottom plan view of the overall appearance of a crack growth detector according to one embodiment of the invention are shown in fig. 1 and 3, respectively. FIG. 2 shows a diagram of the internal construction of a crack growth detector according to one embodiment of the invention. Fig. 4 and 5 show a crack growth detector overall installation detection method and detection principle, respectively, according to an embodiment of the present invention.
As shown in fig. 1, 2 and 3, the crack growth detector includes: the solar panel 1 is installed at the top of the shell 2, the solar panel 1 is connected with the storage battery 6 through the power transmission line 5, the storage battery 6 is respectively electrically connected with the single chip microcomputer 7 and the signal transmitter 9 to supply power to the storage battery, the signal transmitter 9, the single chip microcomputer 7, the current sensor 10, the flexible flat cable 11 and the flexible resistance strain gauge 12 are electrically connected in sequence, the bottom plate 4 is provided with the fixing screw lug hole 3 and the double faced adhesive tape 13, and the flexible resistance strain gauge 12 extends out of the bottom plate extending port 8.
As shown in fig. 4 and 5, the method for monitoring the crack growth detector includes: the flexible resistance strain gauge 12 is inserted into the building crack 17 after extending out of the bottom plate extending outlet 8, meanwhile, the epoxy glue 18 is filled into the building crack 17 under high pressure, then the crack expansion detector 15 is fixed on the building wall 14 through the screw 16 and the double faced adhesive tape 13, after the installation is finished, the crack monitoring instrument 15 is started, the epoxy glue 18 is solidified and has pressure effect on the flexible resistance strain gauge 12 all the time, the flexible resistance strain gauge 12 deforms when being extruded, the resistance value changes, the resistance value of the flexible resistance strain gauge 12 is reduced when the pressure is high, the pressure is reduced, the resistance value of the flexible resistance strain gauge is increased, the current value of the flexible resistance gauge is reduced, the single-chip microcomputer 7 directly receives an electric signal transmitted from the flexible resistance strain gauge 12, the current sensor 10 processes the electric signal and transmits the electric signal to the single-chip microcomputer 7, the related data is transmitted to the base station through the signal transmitter 9 after calculation, and the data information is transmitted to the remote server through the base station, if the wall bodies on two sides of the building crack 17 expand to the original filled epoxy glue 18 can be reduced, the flexible resistance strain gauge 12 can not be deformed when the building crack 17 expands to a certain extent, the stress signal is not repaired to be found to be the remote server if the stress signal is small after the stress is small, and the current is reduced after the stress signal is reduced.
The crack growth detector is a novel invention and a novel detection method aiming at the harmful cracks of the concrete building, and the danger caused by the expansion of the harmful cracks can be timely subjected to emergency measures through the real-time monitoring of the harmful cracks, so that the safety of personnel is ensured. Compared with the traditional manual field periodic detection, the method has the advantages of obviously improving timeliness, accuracy, safety and working efficiency.
The foregoing description of embodiments of the invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described.
Claims (9)
1. A crack growth detector, comprising:
the device comprises a shell, wherein a storage space is arranged in the shell, and an extension opening is arranged on the bottom surface of the shell;
a current sensor, a signal emitter, a flexible resistance strain gauge and a control unit are arranged in the shell;
the flexible resistance strain gauge is electrically connected to the current sensor, the control unit is electrically connected to the current sensor and the signal transmitter, the flexible resistance strain gauge can be inserted into a crack repaired by pouring epoxy glue through the extending opening, the epoxy glue is solidified and has pressure effect on the flexible resistance strain gauge all the time, the flexible resistance strain gauge can deform when being extruded to change the resistance value, the resistance value of the flexible resistance strain gauge is reduced when the pressure is increased, the resistance value of the flexible resistance strain gauge is increased when the pressure is reduced, the current value of the flexible resistance strain gauge is reduced, the extrusion force of a wall body on the epoxy glue is reduced when the repaired crack is expanded, and the flexible resistance strain gauge can not bear any force after the crack is expanded to a certain degree;
the device comprises a shell, and is characterized by further comprising a fixing lug and a double faced adhesive tape, wherein one side of the double faced adhesive tape is attached to the bottom surface of the shell, and the shell is fixed on a surface to be detected through the double faced adhesive tape and the fixing lug.
2. The crack growth detector of claim 1, further comprising a server communicatively coupled to the signal transmitter.
3. The crack growth detector of claim 1, further comprising a power supply unit electrically connected to the signal transmitter and the control unit.
4. The crack growth detector of claim 3, further comprising a solar panel electrically connected to the power supply unit.
5. The crack growth detector according to claim 4, wherein a groove is provided at one side of the housing, a solar panel is provided in the groove, and the solar panel is electrically connected to the power supply unit.
6. The crack growth detector of claim 1, wherein the flexible resistive strain gauge is electrically connected to the current sensor by a flexible flat cable.
7. A crack growth detection method based on the crack growth detector as defined in any one of claims 1 to 6, characterized in that the crack growth detection method comprises:
inserting the flexible resistance strain gauge into the crack, and repairing the crack;
detecting current intensity information through a current sensor;
when the current intensity decreases, crack growth is determined.
8. The crack growth detection method according to claim 7, wherein the determining crack growth when the current intensity is reduced comprises:
the server sets a current threshold;
detecting current intensity information through a current sensor, and sending the current intensity information to a server through a signal transmitter;
and judging crack propagation when the current intensity received by the server is lower than the current threshold value.
9. The crack growth detection method according to claim 8, further comprising:
after repairing the crack, detecting current intensity information by a current sensor;
the server receives the current intensity information;
and when the current intensity is lower than the current threshold value, judging that crack repair is unsuccessful.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811068295.0A CN109186446B (en) | 2018-09-13 | 2018-09-13 | Crack growth detector and crack growth detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811068295.0A CN109186446B (en) | 2018-09-13 | 2018-09-13 | Crack growth detector and crack growth detection method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109186446A CN109186446A (en) | 2019-01-11 |
| CN109186446B true CN109186446B (en) | 2024-02-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811068295.0A Active CN109186446B (en) | 2018-09-13 | 2018-09-13 | Crack growth detector and crack growth detection method |
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| Country | Link |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001153789A (en) * | 1999-11-25 | 2001-06-08 | Hitachi Ltd | Crack growth test apparatus |
| JP2004333181A (en) * | 2003-05-01 | 2004-11-25 | Toa Harbor Works Co Ltd | Method for detecting crack width in concrete structure, and method for monitoring crack |
| CN102621281A (en) * | 2012-04-10 | 2012-08-01 | 南京理工大学 | Automatic crack detection and alarm system and method for vane of wind driven generator |
| CN203772787U (en) * | 2014-02-07 | 2014-08-13 | 武汉理工大学 | Real-time metal structure crack monitoring device |
| CN205175951U (en) * | 2015-10-30 | 2016-04-20 | 金翼安达航空科技（北京）有限公司 | Structure crackle on -line monitoring system |
| CN206399851U (en) * | 2016-12-20 | 2017-08-11 | 武汉工程大学 | Monitoring crack growth apparatus and system |
| CN207649535U (en) * | 2017-12-26 | 2018-07-24 | 防灾科技学院 | Crack change detecting device |
| CN108317948A (en) * | 2018-01-30 | 2018-07-24 | 山东大学 | Resistance value alertness grid foundation displacement tests system and method |
| CN208736338U (en) * | 2018-09-13 | 2019-04-12 | 武汉轻工大学 | Crack extesion detector |
-
2018
- 2018-09-13 CN CN201811068295.0A patent/CN109186446B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001153789A (en) * | 1999-11-25 | 2001-06-08 | Hitachi Ltd | Crack growth test apparatus |
| JP2004333181A (en) * | 2003-05-01 | 2004-11-25 | Toa Harbor Works Co Ltd | Method for detecting crack width in concrete structure, and method for monitoring crack |
| CN102621281A (en) * | 2012-04-10 | 2012-08-01 | 南京理工大学 | Automatic crack detection and alarm system and method for vane of wind driven generator |
| CN203772787U (en) * | 2014-02-07 | 2014-08-13 | 武汉理工大学 | Real-time metal structure crack monitoring device |
| CN205175951U (en) * | 2015-10-30 | 2016-04-20 | 金翼安达航空科技（北京）有限公司 | Structure crackle on -line monitoring system |
| CN206399851U (en) * | 2016-12-20 | 2017-08-11 | 武汉工程大学 | Monitoring crack growth apparatus and system |
| CN207649535U (en) * | 2017-12-26 | 2018-07-24 | 防灾科技学院 | Crack change detecting device |
| CN108317948A (en) * | 2018-01-30 | 2018-07-24 | 山东大学 | Resistance value alertness grid foundation displacement tests system and method |
| CN208736338U (en) * | 2018-09-13 | 2019-04-12 | 武汉轻工大学 | Crack extesion detector |
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| CN109186446A (en) | 2019-01-11 |
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