CN220288520U - Test device for monitoring crack cracking of concrete bridge structure - Google Patents
Test device for monitoring crack cracking of concrete bridge structure Download PDFInfo
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- CN220288520U CN220288520U CN202321454533.8U CN202321454533U CN220288520U CN 220288520 U CN220288520 U CN 220288520U CN 202321454533 U CN202321454533 U CN 202321454533U CN 220288520 U CN220288520 U CN 220288520U
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- 238000012360 testing method Methods 0.000 title claims abstract description 248
- 238000012544 monitoring process Methods 0.000 title claims abstract description 24
- 238000005336 cracking Methods 0.000 title abstract description 24
- 230000002093 peripheral effect Effects 0.000 claims abstract description 7
- 239000000758 substrate Substances 0.000 claims description 30
- 230000001681 protective effect Effects 0.000 claims description 17
- 230000000977 initiatory effect Effects 0.000 claims 5
- 238000000034 method Methods 0.000 abstract description 7
- 239000000853 adhesive Substances 0.000 description 11
- 230000001070 adhesive effect Effects 0.000 description 11
- 238000009434 installation Methods 0.000 description 8
- 238000011161 development Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 238000010276 construction Methods 0.000 description 3
- 230000008447 perception Effects 0.000 description 3
- 239000002390 adhesive tape Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012806 monitoring device Methods 0.000 description 2
- 239000004642 Polyimide Substances 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The utility model discloses a testing device for monitoring crack cracking of a concrete bridge structure, which comprises a strain testing ring belt and/or a strain testing strip; a plurality of strain test strips are uniformly arranged on the inner peripheral side of the strain test ring belt at intervals along the circumferential direction of the strain test ring belt, and each strain test strip extends along the diameter of the strain test ring belt and crosses at the center of the strain test ring belt; or the plurality of concentrically arranged strain test zones are gradually increased in diameter from inside to outside, the plurality of strain test strips are uniformly arranged on the inner circumference side of the outermost strain test zone at intervals along the circumference direction of the outermost strain test zone, each strain test strip extends along the diameter of the strain test zone and is intersected at the center of the strain test zone, and each strain test zone is correspondingly connected with each strain test strip. The advantages are that: the method can adapt to various crack forms and sensitively sense the crack or crack width expansion of the crack, accurately acquire the crack condition of the structural surface, and provide support for evaluating the stress performance of the crack.
Description
Technical Field
The utility model relates to the technical field of bridge engineering, in particular to a testing device for monitoring crack cracking of a concrete bridge structure.
Background
The large-span concrete bridge occupies an important position in road traffic and is often an important node of the traffic. At present, the bridge bears various loads and changes of environmental effects in the construction and service processes, the stress state of the bridge is relatively complex and is extremely easy to crack, and the structural rigidity and durability of the bridge are directly reduced due to the cracking, so that the bridge is necessary to monitor cracking and development of the crack and timely master state information of the bridge.
But is determined by the design and construction characteristics of the large-span bridge, and the stress state of the key part is relatively complex. Because of special stress and structural characteristics, the regional cracking risk and the crack trend form are complex, and high requirements are provided for accurately monitoring the cracking and the development of the concrete surface.
For monitoring the surface cracking of the structure, no effective solution is currently popularized. The traditional method is developed by adopting a structural visual detection mode. The method generally has hysteresis, and can not find the cracking of the surface of the structure in time. Therefore, the method has important significance on how to accurately monitor the cracking condition of the surface of the structure in the areas with complex stress and easy cracking, and further obtain the state of the bridge.
Disclosure of Invention
The utility model aims to provide a testing device for monitoring crack cracking of a concrete bridge structure, so as to solve the problems in the prior art.
In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:
a testing device for monitoring crack cracking of a concrete bridge structure comprises a strain testing ring belt and/or a strain testing strip;
the inner peripheral side of the strain testing ring belt is uniformly provided with a plurality of strain testing strips at intervals along the circumferential direction, each strain testing strip extends along the diameter of the strain testing ring belt and crosses at the center of the strain testing ring belt, and two ends of each strain testing strip are connected with the strain testing ring belt;
or, a plurality of strain test zones with different diameters are concentrically arranged at intervals, the diameter of each strain test zone is gradually increased from inside to outside along the radial direction, a plurality of strain test strips are uniformly arranged on the inner peripheral side of the outermost strain test zone at intervals along the circumferential direction, each strain test strip extends along the diameter of the strain test zone and intersects at the center of the strain test zone, two ends of each strain test strip are connected with the outermost strain test zone, and each strain test zone on the inner side is correspondingly connected with each strain test strip.
Preferably, the strain testing endless belt is circular or regular polygonal.
Preferably, when a strain testing cuff and a strain testing strip are used in combination, the number of strain testing strips is an even number.
Preferably, the strain testing ring belt and the strain testing strip comprise a substrate, a resistive sensitive grid, an outgoing line and a protective film, wherein the protective film is correspondingly covered above the substrate, a plurality of resistive sensitive grids are uniformly arranged between the substrate and the protective film at intervals along the length direction of the substrate, the resistive sensitive grids are fixedly connected with the substrate, and the protective film is fixedly connected with the resistive sensitive grids and the substrate; all the resistance sensitive grids in the same strain testing ring belt or the same strain testing strip are connected with outgoing lines, and the outgoing lines are connected with strain acquisition meters.
Preferably, the resistance of the resistance sensitive gate is 120 omega, and the strain testing range is-3000 mu epsilon and the precision is 1% FS.
Preferably, the testing device further comprises a spoke positioning ruler, wherein the spoke positioning ruler comprises a plurality of spokes with end parts connected together, the spokes are uniformly arranged at intervals along the circumferential direction of the end part connection part, and each spoke extends outwards along the radial direction of the end part connection part; a plurality of pasting positioning identification points are arranged on each spoke at intervals along the length direction of the spoke;
when the strain testing endless belt and the strain testing strips are used in combination, the included angle between the adjacent strain testing strips is equal to the included angle between the adjacent two spokes, or the included angle between the adjacent strain testing strips is an integral multiple of the included angle between the adjacent two spokes.
The beneficial effects of the utility model are as follows: 1. the strain testing ring belt and the strain testing strip belt which are provided with the resistance type sensitive grid are adopted for monitoring, and the strain testing ring belt can effectively adapt to the crack forms in all directions due to the shape characteristics of the strain testing ring belt, so that transverse, vertical and oblique cracks can be well captured, the shape influence of the cracks and the sensing device is effectively reduced, and the strain testing ring belt has good adaptability. 2. Each strain testing ring belt can flexibly select a single strain testing ring belt or a plurality of strain testing ring belt combinations organically formed by various specifications according to the surface and crack testing requirements of the tested area, so that the strain testing ring belt is flexibly adapted to the surface size of the tested area, the testing range is expanded, and the diversity and adaptability of the testing scheme are improved. And when a plurality of strain test ring bands are combined, the shape and the development track of the crack can be more effectively and accurately captured through the combined sensing of the plurality of strain test ring bands and the strain test strips, so that a better test effect is realized. 3. The spoke positioning ruler effectively realizes the efficient and accurate positioning of the annular belt and the combination thereof, and enables the testing device to be installed in place at one time, thereby avoiding a great deal of complicated, rough and repeated manual positioning operation and effectively guaranteeing the working efficiency and the testing effect.
Drawings
FIG. 1 is a schematic diagram of a test apparatus according to an embodiment of the present utility model; wherein, (a) is a strain testing cuff and strain testing strip combination configuration; (b) is a strain testing cuff configuration; (c) is a strain test strip construction;
FIG. 2 is a cross-sectional view of a strain testing cuff or strain testing strip in an embodiment of the present utility model;
FIG. 3 is a schematic view of a spoke positioning ruler according to an embodiment of the present utility model;
FIG. 4 is a schematic view of a test device mounted on a spoke positioning ruler according to an embodiment of the present utility model;
FIG. 5 is a cross-sectional view of a test device mounted on a surface of a region to be tested in an embodiment of the present utility model;
FIG. 6 is a schematic diagram of a testing device for crack monitoring in an embodiment of the present utility model.
In the figure: 1. a strain testing annulus; 2. a strain test strip; 3. a substrate; 4. a resistive sense gate; 5. a protective film; 6. a lead wire; 7. sticking a fixed point; 8. spokes; 9. pasting positioning identification points; 10. structural adhesive; 11. a surface of the region to be measured; 12. and (5) cracking.
Detailed Description
The present utility model will be described in further detail with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the detailed description is presented by way of example only and is not intended to limit the utility model.
As shown in fig. 1, in this embodiment, a test device for monitoring crack cracking of a concrete bridge structure is provided, which includes a strain test endless belt 1 and/or a strain test strip 2;
a plurality of strain test strips 2 are uniformly arranged on the inner peripheral side of the strain test annular belt 1 at intervals along the circumferential direction, each strain test strip 2 extends along the diameter of the strain test annular belt 1 and intersects at the center of the strain test annular belt 1, and two ends of each strain test strip 2 are connected with the strain test annular belt 1;
or, a plurality of strain test zones with different diameters are concentrically arranged at intervals, the diameter of each strain test zone gradually increases from inside to outside along the radial direction, a plurality of strain test strips 2 are uniformly arranged on the inner peripheral side of the outermost strain test zone 1 at intervals along the circumferential direction, each strain test strip 2 extends along the diameter of the strain test zone 1 and intersects at the center of the strain test zone 1, two ends of each strain test strip 2 are connected with the outermost strain test zone 1, and each strain test zone 1 on the inner side is correspondingly connected with each strain test strip 2.
The plurality of strain test strips 2 may or may not be connected to each other at the intersections, and may specifically be selected according to actual conditions, so as to better satisfy actual requirements.
In this embodiment, the strain testing endless belt 1 and the strain testing strip 2 are all independently constructed. The strain testing ring belt 1 and the strain testing strip 2 can be used for testing independently, and can also be combined with each other to form concentric rings so as to flexibly and accurately capture the cracking and development trend of the crack 12 and can be mutually verified.
In this embodiment, the strain testing ring belt 1 is circular or regular polygon. The method can be specifically selected according to actual conditions so as to better meet actual demands.
In this embodiment, when the strain test endless belt 1 and the strain test strip 2 are used in combination, the number of the strain test strips 2 is an even number, and at this time, if the strain test endless belt 1 is a regular polygon, it should be a regular polygon with even sides.
As shown in fig. 2, in this embodiment, the strain testing ring belt 1 and the strain testing strip 2 each include a substrate 3, a resistive sensing grid 4, a lead-out wire and a protective film 5, the protective film 5 is correspondingly covered above the substrate 3, a plurality of resistive sensing grids 4 are uniformly arranged between the substrate 3 and the protective film 5 along the length direction thereof at intervals, the resistive sensing grids 4 are fixedly connected with the substrate 3, and the protective film 5 is fixedly connected with the resistive sensing grids 4 and the substrate 3; all the resistive sensing grids 4 located in the same strain testing endless belt 1 or the same strain testing strip 2 are connected with outgoing lines, and the outgoing lines are connected with strain collecting instruments.
The substrate 3 is made of polyimide material, and a resistive sensitive grid 4 is arranged on the substrate. When the strain test strip 2 is used in combination with the strain test strip 1, the substrate 3 of the strain test strip 1 is reliably affixed to the surface 11 of the area to be tested at the affixing point 7. The base 3 of the strain test strip 2 is suspended and not adhered to the concrete to conduct the cracking deformation of the concrete. When the strain test belt 1 and the strain test strip 2 are used independently, the substrate 3 of the strain test belt 1 and the strain test strip 2 needs to be reliably adhered and fixed to the surface 11 to be measured at the adhering and fixing point 7.
A resistive sensitive grid 4 is arranged on the substrate 3, the resistance of the resistive sensitive grid is 120 omega, the strain testing range is-3000 mu epsilon, the precision is 1% FS, and the requirement of crack perception testing is met. The resistive sensitive grid 4 is reliably connected with the substrate 3 to ensure that the deformation of the resistive sensitive grid and the substrate is consistent and the strain conduction is accurate. Meanwhile, the lead wires 6 connected to the resistive sensitive grids 4 are led out from one side and are connected to the strain acquisition instrument in a clustered manner, so that strain value acquisition and crack perception of the sensitive grids are realized. Thus, by combining advanced acquisition and calculation methods, the acquisition of the fracture condition of the fracture 12 of the surface 11 of the region to be detected can be realized.
To protect the monitoring device from damage before installation and use, a protective film 5 is provided over the substrate 3 and the resistive sensor grid 4. The protective film 5 is reliably connected with the substrate 3 and the resistive sensitive grid 4, so that the resistive sensitive grid 4 is packaged between the substrate 3 and the protective film 5 to avoid damage, and a guarantee is provided for long-term storage and accurate testing of the device.
In this embodiment, because of the uncertainty of the shape and trend of the crack 12, the testing device adopts the regular dodecagon strain testing ring belt 1, so that the device can effectively adapt to the cracks 12 in all directions. Meanwhile, the strain test strips 2 connected to the strain test ring belt 1 can effectively perform auxiliary verification on the sensing condition of the strain test ring belt 1, and the positioning accuracy of crack sensing is greatly improved. The strain testing belt 1 and the strain testing strip 2 each comprise various dimensions to flexibly adapt to the testing requirements of various areas and cracks 12, and the dimensions of the strain testing belt 1 are shown in table 1.
TABLE 1 annulus size specification (Unit: cm)
Each strain testing ring belt 1 can be independently tested according to the size of the surface 11 of the detected area, and a plurality of strain testing ring belt 1 sizes can be flexibly and adaptively selected to form a concentric combination according to the actual situation and the cracking characteristics of the area, so that the cracking and development situation of the crack 12 can be monitored more accurately. The flexible combination described above for testing is made possible by the variety of dimensions of the strain testing cuff 1.
For the installation of the monitoring device, a plurality of strain test endless belts 1 and strain test strips 2 are required to be accurately distributed, the traditional installation mode is large in workload and inaccurate in size positioning, workers rely on experiences to operate, and the testing quality of the device is greatly affected. In order to improve the installation accuracy and efficiency of the testing device and ensure the installation quality, in the embodiment, the spoke positioning ruler is provided to efficiently and conveniently realize the installation of the testing device.
The spoke positioning ruler comprises a plurality of spokes 8 with end parts connected together, wherein each spoke 8 is uniformly arranged at intervals along the circumferential direction of the end part connection part, and each spoke 8 extends outwards along the radial direction of the end part connection part; a plurality of pasting positioning identification points 9 are arranged on each spoke 8 at intervals along the length direction;
the angle between adjacent strain test strips 2 is equal to the angle between adjacent spokes 8, or the angle between adjacent strain test strips 2 is an integer multiple of the angle between adjacent spokes 8.
As shown in fig. 3, the spoke positioning ruler comprises 12 spokes 8 which extend from a central point, and the included angle between two adjacent spokes 8 is 30 degrees so as to adapt to the regular dodecagon strain testing girdle 1. The number of spokes 8 and the angle between adjacent spokes 8 can be selected according to the actual situation so as to better meet the actual requirements.
The spoke 8 has a length of 60cm, and a plurality of pasting positioning identification points 9 are arranged on the front face of the spoke along the length direction at intervals and are used for being matched with pasting fixed points 7 (namely positions where structural adhesive 10 needs to be coated) on the strain testing annular belt 1, so that indication marks are conveniently provided for operators, and workers are prompted to coat the structural adhesive 10 at the pasting fixed points 7 when the testing device is installed, so that the testing device is installed on the surface 11 of the tested area. In order to further increase the robustness and stability of the connection between the test device and the surface to be tested and to subdivide the distance between the attachment points 7, a structural adhesive 10 may also be applied at the intersection point of the strain test strip 2 for a cured connection with the surface to be tested 11.
The spoke 8 is made of stainless steel, and has a width of 2cm and a thickness of 1cm, so that good corrosion resistance and rigidity are ensured. When the strain testing device is used, firstly, each strain testing ring belt 1 and each strain testing strip 2 are temporarily fixed on a spoke positioning ruler according to the pasting positioning mark points 9 in sequence to form ring belt combinations, the strain testing ring belts 1 and the strain testing strips 2 are tensioned, the pasting fixing points 7 of the strain testing ring belts 1 and the strain testing strips 2 are overlapped with the pasting positioning mark points 9 on the spoke positioning ruler, and then the connection of the strain testing ring belts 1 and the strain testing strips 2 is completed; then, structural adhesive 10 is smeared at the position of the substrate 3 of the strain testing ring belt 1 corresponding to the sticking positioning mark point 9; finally, after accurate positioning is completed on the surface 11 of the tested area through the spoke positioning ruler, the spoke positioning ruler is extruded, so that the substrate 3 of the strain testing ring belt 1 is connected with the surface 11 of the tested area through the structural adhesive 10, and the ring belt combination is directly installed on the surface 11 of the tested area at one time. After the adhesion is completed, the structural adhesive 10 is partially cured or completely cured, and when the adhesive force between the ring belt combination and the surface 11 of the area to be tested is larger than the adhesive force between the spoke positioning ruler and the ring belt combination, the connection between the spoke positioning ruler and the ring belt combination can be removed, and after the structural adhesive 10 is completely cured, the installation of the device is completed.
When the strain testing ring belt 1 and the strain testing strip 2 are arranged on the spoke positioning ruler, double-sided adhesive tape with smaller viscosity (the viscosity is smaller than that of the structural adhesive tape 10, and the spoke positioning ruler is convenient to disassemble in the later stage) or parts such as a buckle and a clip, which are convenient to install and disassemble, can be adopted, and one side of the protective film 5 of the strain testing ring belt 1 and the strain testing strip 2 is connected with the spoke positioning ruler, so that temporary fixation of the strain testing ring belt and the strain testing strip 2 is realized.
In this embodiment, the method for implementing the test by the test device includes:
firstly, determining the area of the bridge structure part needing to monitor the cracking of the concrete surface, polishing the surface of the bridge structure part to expose the rough base layer, and enabling the flatness of the bridge structure part to meet the requirements, so that the device is firmly bonded and accurate in perception. On the basis, the surface of the base layer to be measured is positioned, and the center of the measuring area and the position of the important measuring point are determined. After the above-mentioned work is completed, according to the condition and requirement of the surface 11 to be tested, the size specification of each strain testing ring belt 1 of the testing device can be flexibly selected, and the strain testing ring belt 1 and the strain testing strip 2 can be numbered to form ring belt combination. The ring belt assembly is tensioned as desired and the side of the surface protecting film 5 is temporarily secured to the spoke positioning ruler as shown in fig. 4. And (3) smearing structural adhesive 10 at the positioning point of the base 3 side of the strain testing ring belt 1 of the ring belt combination, and then finishing the positioning of the ring belt combination on the tested concrete through a spoke positioning ruler. The positioning ruler is extruded to the surface of the concrete, so that the ring belt is assembled and adhered to the concrete to be tested, and the installation section of the ring belt is shown in figure 5. After the spoke positioning ruler is placed for a period of time and is firmly installed, the spoke positioning ruler is taken down, the lead 6 is led out and connected with the strain acquisition instrument, and the structure cracking monitoring and the data storage are carried out by automatically testing the storage device.
When a crack 12 appears and gradually expands, the crack 12 enters the monitoring area and gradually spans each strain testing annular belt 1 in the device, so that the strips in the corresponding areas are stretched, and the values of the correspondingly numbered resistive sensitive grids 4 are suddenly increased. Meanwhile, the resistance sensitive grid 4 on the adjacent area strip also responds, so that the resistance sensitive grid can be mutually checked with the strain test result on the strain test annular belt 1, and abnormal false alarm is avoided. Based on the monitoring mode, the existence of the crack 12 crossing in the corresponding numbered area can be effectively perceived, so that the shape trend of the crack 12 is indicated, and meanwhile, the positioning performance of the crack 12 can be further improved by assisting with the strain test response result of the adjacent strain test strip 2, and the high-quality monitoring of the shape is realized, as shown in fig. 6. Considering that the stress strain has a smaller effect than the slit width, the slit width in the strain sensing direction can be estimated as Δε·L, where Δε is the incremental change of the resistive sensor grid 4 before and after cracking, and L is the fixed point spacing in Table 1, by neglecting the effect. Thus, the crack and development monitoring of the structural crack 12 can be achieved.
By adopting the technical scheme disclosed by the utility model, the following beneficial effects are obtained:
the utility model provides a testing device for monitoring crack cracking of a concrete bridge structure, which is used for monitoring by adopting a strain testing ring belt and a strain testing strip belt which are provided with resistance sensitive grids, and can effectively adapt to crack forms in all directions due to the shape characteristics of the strain testing ring belt, so that transverse, vertical and oblique cracks can be well captured, the shape influence of the cracks and a sensing device is effectively reduced, and the testing device has good adaptability. Each strain testing ring belt can flexibly select a single strain testing ring belt or a plurality of strain testing ring belt combinations organically formed by various specifications according to the surface and crack testing requirements of the tested area, so that the strain testing ring belt is flexibly adapted to the surface size of the tested area, the testing range is expanded, and the diversity and adaptability of the testing scheme are improved. And when a plurality of strain test ring bands are combined, the shape and the development track of the crack can be more effectively and accurately captured through the combined sensing of the plurality of strain test ring bands and the strain test strips, so that a better test effect is realized. The spoke positioning ruler effectively realizes the efficient and accurate positioning of the annular belt and the combination thereof, and enables the testing device to be installed in place at one time, thereby avoiding a great deal of complicated, rough and repeated manual positioning operation and effectively guaranteeing the working efficiency and the testing effect.
The foregoing is merely a preferred embodiment of the present utility model and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present utility model, which is also intended to be covered by the present utility model.
Claims (6)
1. Test device of monitoring concrete bridge structure crack fracture, its characterized in that: including a strain testing cuff and/or a strain testing strip;
the inner peripheral side of the strain testing ring belt is uniformly provided with a plurality of strain testing strips at intervals along the circumferential direction, each strain testing strip extends along the diameter of the strain testing ring belt and crosses at the center of the strain testing ring belt, and two ends of each strain testing strip are connected with the strain testing ring belt;
or, a plurality of strain test zones with different diameters are concentrically arranged at intervals, the diameter of each strain test zone is gradually increased from inside to outside along the radial direction, a plurality of strain test strips are uniformly arranged on the inner peripheral side of the outermost strain test zone at intervals along the circumferential direction, each strain test strip extends along the diameter of the strain test zone and intersects at the center of the strain test zone, two ends of each strain test strip are connected with the outermost strain test zone, and each strain test zone on the inner side is correspondingly connected with each strain test strip.
2. The test device for monitoring crack initiation of a concrete bridge structure of claim 1, wherein: the strain testing ring belt is round or regular polygon.
3. The test device for monitoring crack initiation of a concrete bridge structure of claim 1, wherein: when a strain testing cuff and a strain testing strip are used in combination, the number of strain testing strips is an even number.
4. The test device for monitoring crack initiation of a concrete bridge structure of claim 1, wherein: the strain testing ring belt and the strain testing strip comprise a substrate, a resistive sensitive grid, an outgoing line and a protective film, wherein the protective film is correspondingly covered above the substrate, a plurality of resistive sensitive grids are uniformly arranged between the substrate and the protective film at intervals along the length direction of the substrate, the resistive sensitive grids are fixedly connected with the substrate, and the protective film is fixedly connected with the resistive sensitive grids and the substrate; all the resistance sensitive grids in the same strain testing ring belt or the same strain testing strip are connected with outgoing lines, and the outgoing lines are connected with strain acquisition meters.
5. The test device for monitoring crack initiation of a concrete bridge structure of claim 4, wherein: the resistance of the resistance sensitive gate is 120 omega, and the strain testing range is-3000 mu epsilon and the precision is 1% FS.
6. The test device for monitoring crack initiation of a concrete bridge structure according to any one of claims 1 to 5, wherein: the testing device further comprises a spoke positioning ruler, wherein the spoke positioning ruler comprises a plurality of spokes with end parts connected together, the spokes are uniformly arranged at intervals along the circumferential direction of the end part connection part, and the spokes extend outwards along the radial direction of the end part connection part; a plurality of pasting positioning identification points are arranged on each spoke at intervals along the length direction of the spoke;
when the strain testing endless belt and the strain testing strips are used in combination, the included angle between the adjacent strain testing strips is equal to the included angle between the adjacent two spokes, or the included angle between the adjacent strain testing strips is an integral multiple of the included angle between the adjacent two spokes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321454533.8U CN220288520U (en) | 2023-06-08 | 2023-06-08 | Test device for monitoring crack cracking of concrete bridge structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321454533.8U CN220288520U (en) | 2023-06-08 | 2023-06-08 | Test device for monitoring crack cracking of concrete bridge structure |
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| Publication Number | Publication Date |
|---|---|
| CN220288520U true CN220288520U (en) | 2024-01-02 |
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|---|---|---|---|
| CN202321454533.8U Active CN220288520U (en) | 2023-06-08 | 2023-06-08 | Test device for monitoring crack cracking of concrete bridge structure |
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| Country | Link |
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| CN (1) | CN220288520U (en) |
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2023
- 2023-06-08 CN CN202321454533.8U patent/CN220288520U/en active Active
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