CN216815578U - Formwork support jacking pressure sensor based on optical fiber sensing technology - Google Patents
Formwork support jacking pressure sensor based on optical fiber sensing technology Download PDFInfo
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- CN216815578U CN216815578U CN202123203497.1U CN202123203497U CN216815578U CN 216815578 U CN216815578 U CN 216815578U CN 202123203497 U CN202123203497 U CN 202123203497U CN 216815578 U CN216815578 U CN 216815578U
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Abstract
The utility model discloses and relates to the technical field of the axial force monitoring of a formwork support, in particular to a formwork support jacking pressure sensor based on an optical fiber sensing technology, wherein a base is provided with a cylindrical bulge which can sleeve an annular beam on the base; a cylindrical groove is formed in the center of the upper cover and is just matched with the base; the middle part of the annular beam is raised, and a circle of optical fiber is circumferentially surrounded; the fiber is inscribed with a grating for strain and temperature measurement. After the optical fiber is encircled on the annular beam, the assembly body is led out through the two outlet flanges, then the optical fiber is connected to the optical fiber demodulation equipment through the optical fiber jumper, and the real-time stress monitoring is realized through calibrating the relation between the strain data of the optical fiber and the overlying stress. The utility model has simple structure, easy installation, higher sensitivity and precision, no current electromagnetism, and relatively better safety performance, and can realize the monitoring of the jacking axial force of the formwork support rod piece under the condition of complex deformation.
Description
Technical Field
The utility model relates to the technical field of formwork support axial force monitoring, in particular to a formwork support jacking pressure sensor based on an optical fiber sensing technology, which is mainly applied to monitoring axial force and stability of a formwork support and the like.
Background
The collapse of the formwork support is one of the main types of construction accidents, and the collapse accident is caused by various factors including the characteristics of the formwork and the like. Because the die carrier belongs to the statically indeterminate structure, and the connection node is semi-rigid, more theoretical analysis problems exist, and certain difficulty is brought to the design of the die carrier. The die carrier is difficult to erect according to the design requirement under the influence of various artificial factors, so that potential safety hazards exist when the die carrier is used. Multiple scholars study deformation modes, node semi-rigidity, stability calculation methods and the like of the die set based on different angles, for example, Scheinan and the like analyze bearing capacity of a vertical rod of the die set through laboratory tests and field tests, and Shironghua and the like and Durongjun study on the value of the calculated length of the vertical rod. Most researches adopt numerical simulation and theoretical analysis methods, and part researches adopt physical model test methods. In order to ensure the use safety and stability of the die carrier, the stress and deformation of the die carrier need to be monitored in real time.
At present, the monitoring technology of the formwork support is improved through multi-generation improvement, developed mature, and the monitoring of the axial force of the rod piece is mainly realized through the means of theodolite, inclinometer, laser displacement sensor, strain gauge and the like. However, most of the traditional monitoring means are point-type monitoring, the automation degree is not high, and the problems of missing detection and the like are easy to occur, so that the modern increasingly complex formwork monitoring requirements are difficult to meet.
The optical fiber sensing technology developed in recent years brings new changes to the monitoring of the formwork support, and the horizontal displacement and stress strain monitoring method based on the optical fiber monitoring technology is more and more applied to the monitoring of the formwork support. At present, optical fiber horizontal displacement monitoring technologies can be mainly divided into two main types, namely a quasi-distributed monitoring technology based on FBG (fiber Bragg Grating), and a distributed monitoring technology based on BOTDR/BOTDA and the like. The traditional FBG displacement sensor can realize remote real-time monitoring, but can only realize quasi-distributed monitoring of a limit point; the sensing optical cable based on the technologies such as BOTDR/BOTDA can realize long-distance distributed monitoring, but has the defects of high cost, high measurement accuracy, low distributed performance, difficulty in real-time monitoring and the like. Therefore, the proper optical fiber monitoring technology needs to be selected according to the specific situation and the requirement of the project. At present, research aiming at the application of the optical fiber in the monitoring of the formwork support is less, so that the problems of poor coupling of the optical fiber and the deformation of the formwork support, low survival rate of an optical fiber sensor in a complex construction environment and the like exist, and further research and improvement on the technology are still needed.
The optical fiber sensing is a novel sensing technology which is rapidly developed in recent years and takes optical fibers as media and light as carriers, has a series of advantages of high sensitivity, electromagnetic interference resistance, long monitoring distance, low cost and the like compared with the traditional monitoring technology, and is widely applied to the engineering fields of petrochemical industry, aerospace, water conservancy and hydropower, civil engineering, geology and the like at present.
Commonly used fiber sensing technologies include OFDR, OTDR, BOTDR, BOTDA, FBG, UWFBG, etc.
The basic principle of FBG is based on time division multiplexing technology, and a single optical fiber can be made into a quasi-distributed optical fiber with a plurality of optical fiber grating points through an online wire drawing grating technology or a static side exposure writing technology. The special optical fiber is positioned by an optical time domain reflection measurement technology after wavelength modulation, temperature and strain measurement with high precision can be realized, the strain/temperature sensing principle is that light meeting Bragg diffraction conditions in incident light is coupled and reflected after being reflected by a grating, the incident light not meeting the conditions can directly penetrate through the grating region, so that the form of a wavelength peak value is shown in a reflected light spectrum, and when the ambient temperature of a fiber core or the optical fiber is subjected to strain change along an axis, the effective refractive index and the grating distance of the fiber core can be changed, so that the central wavelength of the reflected light is caused to drift and change, and the temperature and the strain can be accurately sensed.
Through the analysis, the main problems to be solved by the utility model are as follows: aiming at the problem that the prior art cannot accurately realize the real-time monitoring of the axial force of a rod piece of the formwork support, the utility model provides the formwork support jacking pressure sensor based on the optical fiber sensing technology.
The significance of solving the technical problems is as follows: the optical fiber sensing is a novel sensing technology which takes optical fiber as a medium and light as a carrier and is rapidly developed in recent years, compared with the traditional monitoring technology, the optical fiber sensing has a series of advantages of high sensitivity, electromagnetic interference resistance, long monitoring distance, low cost and the like, and the optical fiber sensing is used in the field of formwork displacement monitoring.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problems, the utility model provides a formwork jacking pressure sensor based on an optical fiber sensing technology.
The utility model provides the following technical scheme: a formwork supporting jacking pressure sensor based on an optical fiber sensing technology comprises a sensing optical fiber, an upper cover, a base, an annular beam and an outlet flange; the upper cover is installed on the upper end face of the base, a closed installation cavity is formed between the upper cover and the base, the annular beam is installed in the installation cavity, the outgoing flange is installed on the outer side of the base, the sensing optical fiber is wound on the annular beam and led out through the outgoing flange and connected to the demodulator, when the sensor is pressed, the upper cover is extruded downwards to cause the annular beam to deform outwards, the sensing optical fiber is pulled to deform, the overlying pressure of the sensor is calculated through the relation between the optical fiber strain and the pressure calibrated in advance, and therefore the jacking pressure monitoring of the formwork support is achieved.
Preferably, a cylindrical protrusion is arranged in the base, and a cylindrical groove matched with the cylindrical protrusion is arranged in the upper cover, so that the two parts can be matched.
Preferably, the outer side of the upper cover is wound with a circle of waterproof ring, so that external foreign matters can be prevented from entering.
Preferably, the annular beam is an irregular ring with a high middle part and a low periphery, so that the ring can be pressed and deformed downwards when the sensor is pressed.
The sensing optical fiber is a special grating optical fiber, the grating engraved on the optical fiber only allows light with a specific wavelength to pass through, the optical fiber is tightly wound on the outer ring of the annular beam and then is led out through the outlet flange, the annular beam is pressed and deformed to drive the optical fiber to stretch, the optical wavelength of the grating can be changed, and the strain value of the optical fiber can be obtained through an optical signal received by the demodulator.
As the sensing optical fiber is sensitive to both strain and temperature, in order to avoid the influence of environmental temperature change on strain measurement, the sensing optical cable is required to be connected with a temperature compensation grating in series, and the section of grating optical fiber keeps a loose-sleeve state and does not deform in cooperation with the annular beam so as to eliminate temperature error.
The utility model relates to a formwork supporting jacking pressure sensor based on an optical fiber sensing technology, which has the beneficial effects that: 1. the optical fiber sensing is a novel sensing technology which takes optical fiber as a medium and light as a carrier and is rapidly developed in recent years, compared with the traditional monitoring technology, the optical fiber sensing has a series of advantages of high sensitivity, electromagnetic interference resistance, long monitoring distance, low cost and the like, and the optical fiber sensing is used in the field of formwork displacement monitoring; 2. the utility model has simple structure, easy installation, high sensitivity and precision and strong reliability, adopts the optical fiber sensing technology, can realize the monitoring of the axial force of the rod piece of the formwork support under the complex condition, does not relate to current electromagnetism and has relatively good safety performance; 3. compared with the traditional monitoring mode that the rod piece axial force can be indirectly obtained only through the deformation of the rod piece of the support die frame, the utility model can be arranged at the top of the rod piece and can directly carry out real-time continuous measurement on the rod piece axial force of the support die frame.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the principles of the utility model and not to limit the utility model. In the drawings:
fig. 1 is a cross-sectional structural view of a formwork jacking pressure sensor based on an optical fiber sensing technology, which is provided by the utility model;
FIG. 2 is a perspective view of a supporting frame jacking pressure sensor based on optical fiber sensing technology in an embodiment of the present invention;
labeled as: 1. an upper cover; 2. a base; 3. a ring beam; 4. an outlet flange; 5. a sensing optical fiber; 6. a waterproof ring; 7. a cylindrical bulge; 8. a cylindrical recess; 9. and (7) installing a cavity.
Detailed Description
The conception, the specific structure and the technical effects produced by the present invention will be clearly and completely described in the following with reference to the embodiments and the accompanying drawings, so as to fully understand the objects, the schemes and the effects of the present invention. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. It should be noted that, unless otherwise specified, when a feature is referred to as being "fixed" or "connected" to another feature, it may be directly fixed or connected to the other feature or indirectly fixed or connected to the other feature. Further, the description of the upper, lower, left, right, etc. used in the present invention is only with respect to the positional relationship of the respective components of the present invention with respect to each other in the drawings.
As shown in fig. 1 to 2, the formwork jacking pressure sensor based on the optical fiber sensing technology comprises a sensing optical fiber 5, an upper cover 1, a base 2, a ring beam 3 and an outlet flange 4; the base 2 is provided with a cylindrical bulge 7, a closed installation cavity 9 is formed between the upper cover 1 and the base 2, and the annular beam 3 is installed in the installation cavity 9; a cylindrical groove 8 is formed in the center of the upper cover 1 and is just matched with the base 2; the middle part of the annular beam 3 is raised, and a circle of optical fiber is circumferentially surrounded; the fiber is inscribed with a grating for strain and temperature measurement. After the optical fiber is wound on the annular beam 3, the optical fiber is led out through the two outlet flanges 4 and then is connected to optical fiber demodulation equipment through an optical fiber jumper, and real-time stress monitoring is achieved through calibrating the relation between the strain data of the optical fiber and the overlying stress. When the sensor is pressed, the upper cover 1 is extruded downwards to cause the annular beam 3 to deform outwards, so that the sensing optical fiber is deformed in a tensile mode, and the overlying pressure of the sensor is calculated through the relationship between the strain and the pressure of the optical fiber calibrated in advance, so that the top support pressure monitoring of the formwork support is realized. The utility model has simple structure, easy installation, higher sensitivity and precision, no current electromagnetism, and relatively better safety performance, and can realize the monitoring of the jacking axial force of the formwork support rod piece under the condition of complex deformation.
The base 2 and the upper cover 1 should be made of corrosion-resistant materials to ensure the durability of the sensor, and the ring beam should be made of metal materials with lower strength to ensure that the ring beam 3 can be obviously deformed when being pressed, which is particularly important for improving the precision of the sensor.
The base 2 has a cylindrical projection 7 of a diameter corresponding to the inner diameter of the ring beam 3 for fixing the ring beam 3, and the upper cover has a corresponding cylindrical recess 8 of the same size to ensure that the two parts fit together. In addition, the waterproof ring 6 is wound on the outer side of the upper cover, so that external foreign matters can be prevented from entering. The ring beam 3 is an irregular ring with a high middle part and a low periphery so as to ensure that the ring can be pressed and deformed downwards when the sensor is pressed.
The sensing optical fiber 5 is sensitive to both strain and temperature, and in order to avoid the influence of environmental temperature change on strain measurement, the sensing optical fiber needs to be connected with a temperature compensation grating in series, and the section of grating optical fiber keeps a loose-sleeve state and does not deform in cooperation with the annular beam 5 so as to eliminate temperature error.
Before the device is used, a calibration test needs to be carried out in advance, a sensor is placed on a loading device in the test, the sensor is loaded step by step, wavelength and strain data measured by the optical fiber are respectively collected and subjected to linear fitting to obtain an expression of a stress-wavelength relation, and therefore the precision of the sensor in use can be guaranteed.
The working principle of the utility model is as follows: the sensor is arranged at the top of the formwork support, after the formwork support is pressed, pressure can be transmitted to the sensor upper cover 1, the upper cover 1 is pressed, deformation of the annular beam 3 is caused, due to the design that the middle of the annular beam 3 is high and the periphery is low, the annular beam 3 can be extruded from the middle to the periphery when deformed, the optical fiber wound on the outer ring of the annular beam 3 is driven to stretch, the demodulator can acquire an optical fiber strain value at the moment, and an overlying pressure value can be obtained through the relationship of optical fiber strain-overlying pressure calibrated in advance, so that monitoring of the jacking pressure of the formwork support is realized.
The utility model provides a formwork jacking pressure sensor based on an optical fiber sensing technology, the optical fiber sensing technology adopted in the above embodiment is an FBG technology, it should be noted that distributed or quasi-distributed optical fiber sensing technologies including but not limited to BOTDR, BOTDA, UWFBG and the like are also applicable, and therefore, the application of other optical fiber sensing technologies in the utility model should be regarded as the protection scope of the utility model. In addition, the technical solutions and ways to implement the present invention are numerous, and the above described embodiments are only the preferred embodiments of the present invention, and it should be noted that, for those skilled in the art, many modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention. The embodiments of the present invention are described in detail with reference to the prior art, and the description thereof is not limited thereto.
Claims (4)
1. A formwork supporting jacking pressure sensor based on an optical fiber sensing technology is characterized by comprising a sensing optical fiber, an upper cover, a base, an annular beam and an outlet flange; the upper cover is installed the up end of base, the upper cover with form confined installation cavity between the base, the annular beam is installed in the installation cavity, the flange installation of being qualified for the next round of competitions is in the outside of base, sensing fiber winds on the annular beam, draws and is connected to the demodulation appearance through the flange of being qualified for the next round of competitions.
2. The formwork propping pressure sensor based on the optical fiber sensing technology is characterized in that a cylindrical protrusion is arranged in the base, and a cylindrical groove matched with the cylindrical protrusion is arranged in the upper cover.
3. The formwork jacking pressure sensor based on the optical fiber sensing technology is characterized in that a waterproof ring is wound on the outer side of the upper cover.
4. The formwork jacking pressure sensor based on the optical fiber sensing technology is characterized in that the annular beam is an irregular circular ring with a high middle part and a low periphery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123203497.1U CN216815578U (en) | 2021-12-17 | 2021-12-17 | Formwork support jacking pressure sensor based on optical fiber sensing technology |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123203497.1U CN216815578U (en) | 2021-12-17 | 2021-12-17 | Formwork support jacking pressure sensor based on optical fiber sensing technology |
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| CN216815578U true CN216815578U (en) | 2022-06-24 |
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| CN202123203497.1U Active CN216815578U (en) | 2021-12-17 | 2021-12-17 | Formwork support jacking pressure sensor based on optical fiber sensing technology |
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- 2021-12-17 CN CN202123203497.1U patent/CN216815578U/en active Active
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