CN112556891B - Concrete whole life period internal stress state monitoring device based on film type sensor - Google Patents
Concrete whole life period internal stress state monitoring device based on film type sensor Download PDFInfo
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- CN112556891B CN112556891B CN202011305757.3A CN202011305757A CN112556891B CN 112556891 B CN112556891 B CN 112556891B CN 202011305757 A CN202011305757 A CN 202011305757A CN 112556891 B CN112556891 B CN 112556891B
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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
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Abstract
The invention provides a film sensor-based concrete full-life internal stress state monitoring device which comprises a polyhedral structure, wherein the polyhedral structure is provided with a plurality of outer side surfaces, a plurality of pressure sensors and tension testing assemblies are arranged on the outer surfaces, the pressure sensors and the tension testing assemblies are not arranged on the same outer surface, and the pressure sensors and the tension testing assemblies can simultaneously monitor the pressure and the tension of concrete in different directions. The concrete stress detection device provided by the invention can be used for directly monitoring the pressure and the tensile force in the concrete structure at the same time, and truly reflecting the current stress state of the concrete.
Description
Technical Field
The invention relates to stress monitoring equipment for concrete, in particular to a membrane sensor-based device for monitoring the internal stress state of concrete in the whole life cycle.
Background
Stress-strain monitoring is an important monitoring project in a concrete dam safety monitoring system during stress-strain monitoring, and is an essential important basis for monitoring dam performance and state change and evaluating dam safety conditions during dam construction or operation. At present, the internal stress value of the concrete structure is obtained by combining a stress-free meter and a stress meter for inversion calculation from the stress analysis data of a data monitoring center of a dam.
According to the existing research results, the factors causing the error of the final monitoring data to be increased exist in the steps of selection, burying, data acquisition, data conversion and the like of a strain instrument. Some scholars improve the existing strain gauge based on the possible error cause, but the research result is still not ideal, and the problem of inaccurate monitoring still exists. In fact, however, many factors that may cause distortion of the strain gauge are due to the fact that the monitoring result is strain monitoring, which has certain limitations. Based on the problems, the invention develops stress monitoring equipment based on a membrane type pressure sensor, and the equipment can accurately, directly and in situ extract the whole life-cycle stress process of concrete.
Disclosure of Invention
The invention aims to provide a film sensor-based concrete full-life internal stress state monitoring device, which can directly monitor the pressure and the tension in a concrete full-life cycle structure simultaneously based on a film pressure sensor and concrete stress monitoring equipment, and truly reflect the current stress state of concrete.
In order to achieve the purpose, the invention provides a film sensor-based concrete whole-life-period internal stress state monitoring device which comprises a polyhedral structure, wherein the polyhedral structure is prepared on the basis of concrete materials and is provided with a plurality of outer surfaces, a plurality of pressure sensors and tension testing assemblies are arranged on the outer surfaces, the pressure sensors and the tension testing assemblies are not arranged on the same outer surface, and the pressure sensors and the tension testing assemblies can simultaneously monitor the pressure and the tension of concrete in different directions.
Preferably, the tensile testing assembly comprises: the film type tension sensor comprises a film type tension sensor, a linear guide rod, a silica gel elastic tube and two square terminals;
the film type tension sensor penetrates through the silica gel elastic tube, two ends of the silica gel elastic tube are partially embedded into the two square terminals respectively, and two ends of the linear guide rod are connected with the two square terminals respectively; one of the square terminals is connected with the polyhedral structure, the end face of the other square terminal is provided with a wiring port, and the wiring port is electrically connected with the film type tension sensor.
Preferably, the pressure sensor comprises a thin film pressure sensor embedded on an outer surface of the polyhedral structure.
Preferably, the outer surface of the thin film pressure sensor is coated with a protective layer.
Preferably, the polyhedral structure includes a regular hexahedral structure, an octahedral structure, and a dodecahedral structure.
Preferably, each outer surface of the polyhedral structure is correspondingly provided with one pressure sensor or one tension testing component.
Preferably, the polyhedral structure is a regular hexahedron, the number of the pressure sensors and the number of the tension testing assemblies are three, and the pressure sensors and the tension sensors are respectively arranged on the outer surfaces of the polyhedral structure, which are opposite to each other.
The invention has the advantages that:
the film sensor-based concrete whole-life-period internal stress state monitoring device provided by the invention is based on the film pressure sensor and the concrete stress monitoring equipment, is pre-embedded in a concrete structure of a monitored object, can directly monitor the pressure and the tension in the concrete whole-life-period structure at the same time, and truly reflects the current stress state of the concrete.
Drawings
Fig. 1 is a schematic structural diagram of a device for monitoring the internal stress state of concrete in the whole life cycle based on a film sensor in the embodiment of the invention.
Fig. 2 is a schematic diagram of a main structure of a polyhedral structure in an embodiment of the present invention.
Fig. 3 is a schematic front view of a tension testing assembly according to an embodiment of the present invention.
FIG. 4 is a schematic top view of a tension testing assembly according to an embodiment of the present invention.
Fig. 5 is a schematic side view of a square terminal according to an embodiment of the invention.
Detailed Description
Referring to the attached drawing 1, fig. 1 exemplarily shows the main structure of a concrete full-life internal stress state monitoring device based on a film sensor. As shown in fig. 1, the device for monitoring the internal stress state of concrete in the whole life cycle based on the film sensor provided by this embodiment includes a polyhedral structure 10, the polyhedral structure 10 is prepared based on a concrete material and includes a plurality of outer surfaces 11, a plurality of pressure sensors 20 and a tension testing component 30 are arranged on the plurality of outer surfaces 11, the pressure sensors 20 and the tension testing component 30 are not arranged on the same outer surface 11, and the plurality of pressure sensors 20 and the tension testing component 30 can monitor the pressure and the tension of concrete in different directions at the same time.
Specifically, the polyhedral structure 10 is made of concrete, and preferably, the concrete material of the polyhedral structure is the same as that of the monitored object. The polyhedral structure 10 may be a regular hexahedral structure, an octahedral structure, or a dodecahedral structure. It should be noted that the polyhedral structure 10 can also be in other polyhedral shapes, and the design can be adjusted accordingly according to the requirements. The polyhedral structure 10 is provided with a plurality of outer surfaces 11 which respectively correspond to different directions, and a plurality of pressure sensors 20 and a plurality of tension testing components 30 are arranged on the outer surfaces 11 of the polyhedral structure 10. Wherein the pressure sensor 20 and the tensile testing assembly 30 are not provided with the same outer surface 11. More specifically, one pressure sensor 20 or tension test assembly 30 is provided on each outer surface 11 of the polyhedral structure 10. Therefore, the pressure and the tension in multiple directions in the concrete structure can be directly monitored at the same time.
Referring to fig. 2, fig. 2 illustrates a main structure of a polyhedral structure. As shown in fig. 2, the polyhedral structure 10 provided in the present embodiment is a regular hexahedron, the number of the pressure sensors 20 and the tension testing assemblies 30 is three, and the pressure sensors 20 and the tension sensors 30 are respectively disposed on opposite outer surfaces of the polyhedral structure 10.
The pressure sensor 20 may be a thin film pressure sensor embedded in the outer surface 11 of the polyhedral structure 10. When the polyhedral structure 10 is subjected to a pressure value in a certain direction, the pressure sensor 20 responds to generate pressure data, and the monitoring of the multidirectional load can be completed because the polyhedral structure 10 is provided with the multidirectional film pressure sensor. The pressure sensor 10 can be used to realize direct and in-situ monitoring of concrete pressure change. Preferably, a protective layer is coated on the outer surface of the thin film pressure sensor to reduce the influence of concrete matrix mortar on the thin film pressure sensor, and at the same time, the device can be directly embedded in concrete, unlike a strain gauge and the like which are influenced by water during the concrete hardening process and the non-uniformity of aggregate.
Referring to fig. 3 to 5, fig. 3 to 5 exemplarily show the main structure of a tension test assembly. The tension testing assembly 30 provided by the embodiment of the invention comprises: the film type tension sensor 31, a linear guide rod 32, a silica gel elastic tube 33 and two square terminals 34.
The film type tension sensor 31 is arranged in the silica gel elastic tube 33 in a penetrating mode, two ends of the film type tension sensor are respectively partially embedded into the two square terminals 34, two ends of the silica gel elastic tube 33 are respectively partially embedded into the two square terminals 34, and two ends of the linear guide rod 32 are respectively connected with the two square terminals 34; one of the square terminals 34 is connected with the polyhedral structure 10, and the end face of the other square terminal 34 is provided with a wiring port 35, wherein the wiring port 35 is electrically connected with the film type tension sensor 31. The linear guide rod 32 can prevent the film type tension sensor 31 from being pressed when being embedded, and the initial setting of the film type tension sensor 31 is influenced. The silicone elastic tube 33 can prevent the film type tension sensor 31 from being affected by water, can also prevent aggregate in concrete from damaging the film type tension sensor 31, and can be matched with the tension state in the concrete structure of the monitored object. The two square terminals 34 are anchored inside a concrete structure of a monitored object, and tension monitoring between the two square terminals is realized.
In this embodiment, the linear guide 32 functions as a film-type tension sensor 31 to prevent the tension sensor 31 from being pressed inward by the two square terminals 34, thereby affecting the initial value setting of the film-type tension sensor 31. The main functions of the silica gel elastic tube 33 are three points: the film type tension sensor 31 is prevented from being influenced by water; the membrane type tension sensor 31 is prevented from being damaged by aggregate in concrete; matching in real time the tension state of the interior of the concrete structure.
In summary, according to the film sensor-based concrete stress state monitoring device in the whole life cycle, the polyhedral structure 10 is provided with the plurality of pressure sensors 20 and the tension testing assemblies 30, so that the pressure and the tension of monitoring points in the concrete structure can be directly monitored at the same time, the current stress state of the concrete is truly reflected, and the problem that the pressure device cannot bear the tension is solved.
The concrete whole-life-period internal stress state monitoring device based on the membrane sensor can be directly buried in concrete of a monitored object, is different from the strain gauge and the like which are influenced by water in the concrete hardening process and uneven aggregate uniformity, and is higher in monitoring precision.
The device for monitoring the stress state in the concrete in the whole life cycle based on the membrane sensor directly responds to the stress state in the concrete without inversion analysis.
The device for monitoring the internal stress state of the concrete in the whole life cycle based on the film sensor is high in sensitivity and good in durability, and can monitor the stress state of the concrete in the whole life cycle.
The film sensor-based concrete full-life internal stress state monitoring device provided by the invention is directly pre-embedded in concrete, and the film pressure sensor is adopted to directly output the stress value according to the actual stress state, so that the in-situ output characteristic is realized, especially the stress state monitoring of early-rise concrete can be realized, and the problem that the early stress of the existing concrete structure cannot be monitored is solved.
The polyhedral structure adopts the concrete material preparation with the same material of monitoring object, is favorable to the inside pressure monitoring process of concrete, gets rid of influences such as dysmorphism structure, improves the pressure monitoring precision.
The above description is of the preferred embodiment of the present invention and the technical principles applied thereto, and it will be apparent to those skilled in the art that any changes and modifications based on the equivalent changes and simple substitutions of the technical solutions of the present invention are within the protection scope of the present invention without departing from the spirit and scope of the present invention.
Claims (6)
1. The device is characterized by comprising a polyhedral structure, wherein the polyhedral structure is prepared on the basis of concrete materials and is provided with a plurality of outer surfaces, the concrete materials are the same as those of a monitored object, a plurality of pressure sensors and tension testing components are arranged on the outer surfaces, the pressure sensors and the tension testing components are not arranged on the same outer surface, and the pressure sensors and the tension testing components can monitor the pressure and the tension of concrete in different directions simultaneously;
the tensile testing assembly comprises: the film type tension sensor comprises a film type tension sensor, a linear guide rod, a silica gel elastic tube and two square terminals;
the film type tension sensor penetrates through the silica gel elastic tube, two ends of the silica gel elastic tube are partially embedded into the two square terminals respectively, and two ends of the linear guide rod are connected with the two square terminals respectively; one of the square terminals is connected with the polyhedral structure, the end face of the other square terminal is provided with a wiring port, and the wiring port is electrically connected with the film type tension sensor.
2. The film sensor-based concrete full-life internal stress condition monitoring device according to claim 1, wherein the pressure sensor comprises a thin film pressure sensor, and the thin film pressure sensor is embedded on the outer surface of the polyhedral structure.
3. The film sensor-based concrete full-life internal stress state monitoring device as claimed in claim 2, wherein the outer surface of the film pressure sensor is coated with a protective layer.
4. The film sensor-based concrete full-life internal stress state monitoring device according to claim 1, wherein the polyhedral structure comprises a regular hexahedral structure, an octahedral structure and a dodecahedral structure.
5. The film sensor-based concrete full-life internal stress state monitoring device according to claim 1, wherein one pressure sensor or tension test component is correspondingly arranged on each outer surface of the polyhedral structure.
6. The film sensor-based concrete full-life internal stress state monitoring device according to claim 1, wherein the polyhedron structure is a regular hexahedron, the number of the pressure sensors and the tension testing assemblies is three, and the pressure sensors and the tension sensors are respectively arranged on the opposite outer surfaces of the polyhedron structure.
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