CN215926091U - Wind-powered electricity generation steel-pipe pile stress monitoring devices based on temperature is revised - Google Patents
Wind-powered electricity generation steel-pipe pile stress monitoring devices based on temperature is revised Download PDFInfo
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- CN215926091U CN215926091U CN202121823181.XU CN202121823181U CN215926091U CN 215926091 U CN215926091 U CN 215926091U CN 202121823181 U CN202121823181 U CN 202121823181U CN 215926091 U CN215926091 U CN 215926091U
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Abstract
The utility model relates to a wind power steel pipe pile stress monitoring device based on temperature correction, which comprises a temperature compensation sensor and an optical fiber strain sensor which are arranged in parallel; the optical fiber strain sensor comprises a strain grating penetrating through the threaded armor pipe, and the strain grating is provided with a strain grating measuring point; the temperature compensation sensor comprises a temperature grating penetrating through the capillary tube, and the temperature grating is provided with a temperature grating measuring point; the temperature compensation sensor and the optical fiber strain sensor are connected to the inner surface of the steel pipe pile together, and the strain grating measuring points correspond to the temperature grating measuring points in position. The optical fiber strain sensor and the temperature compensation sensor are in the same environment, the same wiring mode is adopted, strain data and temperature data between two anchoring points are monitored along with the synchronous deformation of the stress of the steel pipe pile, and therefore the problem of temperature cross interference of the strain grating is solved, and the manufacturing is simple and convenient.
Description
Technical Field
The utility model relates to the field of wind power facility monitoring, in particular to a wind power steel pipe pile stress monitoring device based on temperature correction.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The pile foundation of the offshore wind power generator (wind power) mainly comprises a large steel pipe pile foundation, and in order to ensure the safety of a pile foundation structure, the structure needs to be subjected to real-time strain monitoring. The existing monitoring mode mainly adopts a resistance strain gauge attached to the surface of a steel pipe pile, the resistance strain gauge is low in price, mature in technology and high in corresponding speed, but a measuring result is easily subjected to electromagnetic interference, so that the testing result is easy to drift, meanwhile, the resistance strain gauge is not enough in waterproof property, the marine environment where a wind power pile foundation is located is washed by seawater at any time, the service life of the resistance strain gauge is short, and the resistance strain gauge is difficult to be applied to long-term monitoring.
The optical fiber sensing technology takes optical fibers as media and light as a carrier, can realize distributed real-time sensing of long-distance external measured information, and has the advantages of strong electromagnetic resistance and corrosion resistance, light weight, flexibility and the like.
The optical fiber sensor can be arranged in the pile foundation in different modes for monitoring internal stress, so that some defects of the resistance strain gauge can be overcome, and the safety of wind power pile foundation construction and wind power operation can be ensured. In the monitoring process, the change of the ambient temperature of the monitoring structure and the change of the structure both influence the wavelength change of the optical fiber grating point, so that the monitoring result has deviation. At present, a thermometer is often placed near a grating point to record the change of ambient temperature in optical fiber monitoring, so that the change of the optical fiber sensor caused by the influence of temperature is obtained, the monitoring method is neither simple nor accurate, and the stress monitoring of the wind power steel pipe pile is influenced.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problems in the background art, the utility model provides a wind power steel pipe pile stress monitoring device based on temperature correction, wherein an optical fiber strain sensor utilizes demodulation equipment to pre-stretch and adjust to ensure the consistency of linear changes of positive and negative measuring ranges of the sensor; and arranging the temperature compensation sensors and the optical fiber strain sensors which are arranged in parallel on the inner surface of the steel pipe pile in a 'full-surface pasting' mode, wherein strain grating measuring points of the optical fiber strain sensors are arranged in alignment with temperature grating measuring points of the temperature compensation sensors, and the vertical distance between the two grating measuring points is shortened as much as possible, so that the problem of temperature cross interference of the strain gratings is solved, and the manufacturing is simple and convenient.
In order to achieve the purpose, the utility model adopts the following technical scheme:
the utility model provides a wind power steel pipe pile stress monitoring device based on temperature correction, which comprises a temperature compensation sensor and an optical fiber strain sensor which are arranged in parallel;
the optical fiber strain sensor comprises a strain grating penetrating through the threaded armor pipe, and the strain grating is provided with a strain grating measuring point; the temperature compensation sensor comprises a temperature grating penetrating through the capillary tube, and the temperature grating is provided with a temperature grating measuring point; the temperature compensation sensor and the optical fiber strain sensor are connected to the inner surface of the steel pipe pile together, and the strain grating measuring points correspond to the temperature grating measuring points in position.
The outer surface of the threaded armor pipe is sleeved with an outer sheath.
The outer surface of the outer sheath is provided with at least two groups of anchoring points, the optical fiber strain sensor is connected to the inner surface of the steel pipe pile through the anchoring points, and the temperature compensation sensor is located on one side of the optical fiber strain sensor.
The strain grating measuring point and the temperature grating measuring point are positioned between the two groups of anchoring points.
The strain grating measuring points and the temperature grating measuring points are arranged in a vertical direction in an alignment mode.
One end of the capillary tube is closed, and the closed end of the capillary tube is fixedly connected with the temperature grating;
the other end of the capillary is connected with a signal receiving and processing device through a temperature grating, and the part of the temperature grating exposed out of the capillary is connected with a tail fiber protection tube.
The temperature compensation sensor and the optical fiber strain sensor are connected with the signal receiving and processing device.
Compared with the prior art, the above one or more technical schemes have the following beneficial effects:
1. the optical fiber strain sensor and the temperature compensation sensor are in the same environment, and the same wiring mode is adopted, so that the temperature compensation is more accurate.
2. The two sensors acquire signals from measuring points corresponding to the positions, so that more accurate stress data is obtained.
3. The temperature compensation sensor can measure the actual temperature and correct the strain monitoring result obtained by the optical fiber strain sensor, so that the finally obtained stress monitoring result is more accurate.
4. After the two sensors are fixedly connected with the surface of the steel pipe pile, strain data and temperature data between the two anchoring points are monitored along with the synchronous deformation of the stress of the steel pipe pile, the distance between the two anchoring points is adjustable, and different monitoring requirements are met.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the utility model, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the utility model and together with the description serve to explain the utility model and not to limit the utility model.
FIG. 1 is a schematic diagram of the overall structure provided by one or more embodiments of the present invention;
in the figure: 1. the fiber bragg grating protection device comprises an outer sheath, 2 parts of a threaded armor tube, 3 parts of a strain grating, 4 parts of strain grating measuring points, 5 parts of anchoring points, 6 parts of a capillary tube, 7 parts of a temperature grating, 8 parts of temperature grating measuring points and 9 parts of a tail fiber protection tube.
Detailed Description
The utility model is further described with reference to the following figures and examples.
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the utility model as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the utility model. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As described in the background art, when the structure of the wind power pile foundation is monitored by using the resistance strain gauge, the problems of electromagnetic interference, environmental influence and the like are easily caused, so that the service life is short and the precision is low. When the stress of the pile foundation is monitored by the optical fiber sensor in the prior art, the optical fiber sensor is easy to be subjected to temperature change, so that the sensor generates structural deformation, the wavelength change of an optical fiber grating point is caused, the stress monitoring result of the pile foundation is inaccurate, and the optical fiber sensor is responded by an additionally arranged thermometer in the prior art, so that the optical fiber sensor is neither simple nor accurate.
For example:
the application No. 201820879417.3, Patch type fiber grating strain sensor, which is a Patch type strain sensor formed by packaging low temperature glass solder, has no temperature compensation function, so the problem of temperature drift exists in practical application;
the application No. 201620375417.0, a fiber grating patch type strain sensor, has a temperature compensation function, but both ends of the temperature compensation grating are fixed on stainless steel sheets, and the stainless steel sheets are still affected by both stress and temperature. In practical application, the fiber grating sensor with the structure has high rigidity, and the strain coupling with the measured structure is poor, so that the strain sensitivity is low.
Therefore, the following embodiment provides a wind power steel pipe pile stress monitoring device based on temperature correction, and the optical fiber strain sensor utilizes demodulation equipment to pre-stretch and adjust to ensure the consistency of the linear change of the positive and negative measuring ranges of the sensor; and arranging the temperature compensation sensors and the optical fiber strain sensors which are arranged in parallel on the inner surface of the steel pipe pile in a 'full-surface pasting' mode, wherein strain grating measuring points of the optical fiber strain sensors are arranged in alignment with temperature grating measuring points of the temperature compensation sensors, and the vertical distance between the two grating measuring points is shortened as much as possible, so that the problem of temperature cross interference of the strain gratings is solved, and the manufacturing is simple and convenient.
The first embodiment is as follows:
as shown in fig. 1, a wind power steel pipe pile stress monitoring device based on temperature correction comprises a temperature compensation sensor and an optical fiber strain sensor which are arranged in parallel;
the optical fiber strain sensor comprises a strain grating 3 penetrating through the threaded armor pipe 2, the outer surface of the threaded armor pipe 2 is sleeved with the outer sheath 1, and the strain grating 3 is provided with a strain grating measuring point 4;
the temperature compensation sensor comprises a temperature grating 7 penetrating through the capillary 6, and the temperature grating 7 is provided with a temperature grating measuring point 8;
the temperature compensation sensor and the optical fiber strain sensor are connected to the inner surface of the steel pipe pile together, and the strain grating measuring point 4 corresponds to the temperature grating measuring point 8 in position.
In the embodiment, the strain grating penetrates through the threaded armor pipe, the outer sheath wraps the threaded armor pipe, and the anchoring points are fixed on two sides of the armor pipe through the binder; the temperature grating passes through the capillary, and one side of the temperature grating is fixed by an adhesive; the optical fiber strain sensor and the temperature compensation sensor are synchronously and fully adhered to the inner surface of the steel pipe pile, so that the two sensors can follow the steel pipe pile to synchronously follow the strain when the steel pipe pile is stressed to generate the strain.
The outer surface of the outer sheath 1 is provided with at least two groups of anchoring points 5, the optical fiber strain sensor is connected to the inner surface of the steel pipe pile through the anchoring points 5, and the temperature compensation sensor is positioned on one side of the optical fiber strain sensor.
The strain grating measuring point 4 and the temperature grating measuring point 8 are positioned between the two groups of anchoring points 5; the distance between the two groups of anchoring points 5 is not limited and is adjusted according to different monitoring requirements.
In this embodiment, the distance between the anchor points is adjustable, i.e., the marker is customizable; the anchoring point is made of ceramic, so that the requirements on corrosion resistance, interference resistance and waterproof performance are met.
One end of the capillary tube 6 is closed, and the closed end of the capillary tube 6 is fixedly connected with the temperature grating 7; the other end of the capillary 6 is connected with a signal receiving and processing device through a temperature grating 7, the part of the temperature grating 7, which is exposed out of the capillary 6, is connected with a tail fiber protection tube 9, and the exposed temperature grating 7 is protected by the tail fiber protection tube 9.
In this embodiment, the capillary 6 is made of a thin steel tube or a glass tube.
In the embodiment, the outer sheath, the threaded armor pipe, the strain grating tail fiber, the strain grating measuring points and the anchoring points form an optical fiber strain sensor;
in the embodiment, a temperature compensation sensor is composed of a capillary tube, a temperature grating tail fiber, a temperature grating measuring point and a tail fiber protection tube;
in this embodiment, the optical fiber strain sensor and the temperature compensation sensor are adhered to the surface of the wind power steel pipe pile with epoxy resin.
The structural optical fiber strain sensor acquires strain of the steel pipe pile, and the strain is converted into a stress signal through the signal receiving and processing device to be output; the temperature compensation sensor acquires temperature data and outputs the temperature data through the signal receiving and processing device; the optical fiber strain sensor and the temperature compensation sensor are in the same environment, and the same wiring mode is adopted, so that the temperature compensation is accurate.
The two sensors acquire signals from measuring points corresponding to the positions, so that more accurate stress data is obtained.
The temperature compensation sensor can measure the actual temperature and correct the strain monitoring result obtained by the optical fiber strain sensor, so that the finally obtained stress monitoring result is more accurate.
After the two sensors are fixedly connected with the surface of the steel pipe pile, strain data and temperature data between the two anchoring points are monitored along with the synchronous deformation of the stress of the steel pipe pile, the distance between the two anchoring points is adjustable, and different monitoring requirements are met.
The working method of the device comprises the following steps:
the temperature compensation sensor is arranged on one side of the optical fiber strain sensor, and the strain grating measuring point 4 corresponds to the temperature grating measuring point 8 in position;
the optical fiber strain sensor is connected with demodulation equipment to acquire the wavelength change of the strain grating, and the stretching state of the strain grating is adjusted to correspond to the pre-stretching of the strain grating;
when the strain grating is in a stretching state, the tested structure is stretched and deformed, and the wavelength is increased when the strain grating is continuously stretched; when the tested structure is compressed and deformed, the strain grating releases the pre-stretching deformation, so that the consistency of the linear change of the positive and negative measuring ranges of the temperature compensation sensor can be ensured by pre-stretching adjustment.
And the optical fiber strain sensor and the temperature compensation sensor are jointly fixed on the inner surface of the steel pipe pile to monitor the stress.
The specific process is as follows:
the first step is preparation before assembly. According to monitoring requirements, an optical fiber strain sensor consisting of an outer sheath 1, a threaded armor pipe 2, a strain grating tail fiber 3, a strain grating measuring point 4 and an anchoring point 5 is arranged in a straight line shape, and a temperature compensation sensor consisting of a capillary 6, a temperature grating tail fiber 7, a temperature grating measuring point 8 and a tail fiber protection pipe 9 is placed on one side of the optical fiber strain sensor. And (4) placing the strain grating measuring points 4 and the temperature grating measuring points 8 in alignment.
And secondly, pre-stretching adjustment, namely connecting the optical fiber strain sensor to demodulation equipment, calculating the pre-stretching wavelength change of the strain grating according to the range design, adjusting the stretching state of the strain grating and pre-stretching the grating. When the strain grating is in a stretching state, the tested structure is stretched and deformed, the wavelength is increased when the strain grating is continuously stretched, and the strain grating releases the pre-stretching deformation when the tested structure is compressed and deformed, so that the consistency of the linear change of the positive range and the negative range of the sensor can be ensured by pre-stretching adjustment, and the sensitivity of the optical fiber strain sensor to the pressure strain is improved by pre-stretching.
And thirdly, comprehensively pasting. The optical fiber strain sensor and the temperature compensation sensor are arranged on the inner surface of the steel pipe pile in a full-surface pasting mode by using epoxy resin glue, the strain grating measuring point 4 and the temperature grating measuring point 8 are aligned as much as possible, and the vertical distance between the two types of grating measuring points is shortened as much as possible to ensure the accuracy of temperature correction.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a wind-powered electricity generation steel-pipe pile stress monitoring devices based on temperature is revised which characterized in that: the temperature compensation sensor and the optical fiber strain sensor are arranged in parallel;
the optical fiber strain sensor comprises a strain grating penetrating through the threaded armor pipe, and the strain grating is provided with a strain grating measuring point; the temperature compensation sensor comprises a temperature grating penetrating through the capillary tube, and the temperature grating is provided with a temperature grating measuring point; the temperature compensation sensor and the optical fiber strain sensor are connected to the inner surface of the steel pipe pile together, and the strain grating measuring points correspond to the temperature grating measuring points in position.
2. The wind power steel pipe pile stress monitoring device based on temperature correction according to claim 1, characterized in that: and the outer surface of the threaded armor pipe is sleeved with an outer sheath.
3. The wind power steel pipe pile stress monitoring device based on temperature correction as claimed in claim 2, wherein: the outer surface of the outer sheath is provided with at least two groups of anchoring points.
4. The wind power steel pipe pile stress monitoring device based on temperature correction as claimed in claim 3, wherein: the strain grating measuring point and the temperature grating measuring point are positioned between the two groups of anchoring points.
5. The wind power steel pipe pile stress monitoring device based on temperature correction according to claim 1, characterized in that: and the optical fiber strain sensor is connected to the inner surface of the steel pipe pile through an anchoring point.
6. The wind power steel pipe pile stress monitoring device based on temperature correction according to claim 1, characterized in that: the temperature compensation sensor is positioned on one side of the optical fiber strain sensor.
7. The wind power steel pipe pile stress monitoring device based on temperature correction according to claim 1, characterized in that: the strain grating measuring points and the temperature grating measuring points are arranged in a vertical direction in an alignment mode.
8. The wind power steel pipe pile stress monitoring device based on temperature correction according to claim 1, characterized in that: one end of the capillary tube is closed, and the closed end of the capillary tube is fixedly connected with the temperature grating.
9. The wind power steel pipe pile stress monitoring device based on temperature correction according to claim 8, characterized in that: the other end of the capillary is connected with a signal receiving and processing device through a temperature grating, and the part of the temperature grating exposed out of the capillary is connected with a tail fiber protection tube.
10. The wind power steel pipe pile stress monitoring device based on temperature correction according to claim 1, characterized in that: the temperature compensation sensor and the optical fiber strain sensor are connected with the signal receiving and processing device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121823181.XU CN215926091U (en) | 2021-08-05 | 2021-08-05 | Wind-powered electricity generation steel-pipe pile stress monitoring devices based on temperature is revised |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121823181.XU CN215926091U (en) | 2021-08-05 | 2021-08-05 | Wind-powered electricity generation steel-pipe pile stress monitoring devices based on temperature is revised |
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| CN215926091U true CN215926091U (en) | 2022-03-01 |
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| CN202121823181.XU Active CN215926091U (en) | 2021-08-05 | 2021-08-05 | Wind-powered electricity generation steel-pipe pile stress monitoring devices based on temperature is revised |
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- 2021-08-05 CN CN202121823181.XU patent/CN215926091U/en active Active
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