CN202403851U - Fiber Bragg grating load cell of anchor cable frame composite structure - Google Patents
Fiber Bragg grating load cell of anchor cable frame composite structure Download PDFInfo
- Publication number
- CN202403851U CN202403851U CN2011205583041U CN201120558304U CN202403851U CN 202403851 U CN202403851 U CN 202403851U CN 2011205583041 U CN2011205583041 U CN 2011205583041U CN 201120558304 U CN201120558304 U CN 201120558304U CN 202403851 U CN202403851 U CN 202403851U
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- Prior art keywords
- anchor
- anchor cable
- fiber bragg
- optical fiber
- measuring point
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- 239000002131 composite material Substances 0.000 title abstract 2
- 238000004873 anchoring Methods 0.000 claims abstract description 24
- 239000000835 fiber Substances 0.000 claims abstract description 14
- 239000013307 optical fiber Substances 0.000 claims description 39
- 239000004568 cement Substances 0.000 claims description 12
- 239000002002 slurry Substances 0.000 claims description 12
- 238000005259 measurement Methods 0.000 abstract description 12
- 239000011509 cement plaster Substances 0.000 abstract 1
- 239000011440 grout Substances 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 239000002689 soil Substances 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 230000001419 dependent effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000005483 Hooke's law Effects 0.000 description 1
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
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- Piles And Underground Anchors (AREA)
Abstract
The utility model relates to a fiber Bragg grating load cell of an anchor cable frame composite structure, which is composed of anchor head measure point fiber Bragg grating, a fiber, an anchor mound, an anchor head clamp, an anchor cable, clamping sheets, an elastic sensitive component, a gasket, an inner pipe, an outer pipe, an anchor cable drill, cement plaster and anchoring section measurement point fiber Bragg grating. The load cell comprises an anchor head measurement point and an anchoring section measurement point, and measurement points of the load cell are connected in series through the fiber. Integral tension stressed on the anchor cable is delivered to the elastic sensitive component through the anchor head clamp, and the grating is adhered to the elastic sensitive component arranged below a panel girder anchor cable clamp along the axial direction. An anchoring section is arranged in the anchor cable drill and bonds the grating on an axle wire position of two ends of a hole inner pipe. The fiber Bragg grating load cell can achieve online measurement of the integral tension, a circular pipe strain sensing structure is adopted, and a phenomenon that the sensitive component can not be adhered directly is avoided. Simultaneously, the fiber Bragg grating is packaged in the inner pipe and prevented from being contacted with grout directly.
Description
Technical field
The utility model relates to a kind of optical fiber Bragg raster force cell of anchor cable frame combination structure, is specifically related to the whole pulling force in anchor cable anchor head place of a kind of side slope prestress anchorage cable and concrete-pile acting in conjunction structure and the optical fiber Bragg raster measurement mechanism that the interior anchor cable of anchoring section boring receives force measurement.Belong to the photoelectron field of measuring technique.
Background technology
Anchor cable frame combination structure is applied to the high gradient slope in highway, railway, the hydraulic engineering usually, is a kind of ruggedized construction of initiatively bearing soil body direction finding pressure.The weathering of ground self and anchor cable self is stressed after the anchor cable installation; Creeping deformation and stress relaxation all can change the stress of anchor cable framework; Particularly domatic compression deformation can make the loss of prestress after anchorage cable stretching is accomplished locking, is prone to cause side slope unstability accident.
Prestress anchorage cable is selected for use usually has the high-intensity lax value that has simultaneously in a small amount.Nominal diameter 15.24 mm; The steel strand wires system of twisting with the fingers by 7
mm forms; Nominal area 140.00 mm2; Single anchor cable breaking load 260 kN; Longitudinal tensile presstressed reinforcing steel maximum strain variation is not less than 3.5%, intensity rank 1860 MPa.When the steel strand wires of anchor cable during at 70% breaking load, 1000 hours stress loss of underrelaxation steel strand wires are 2.5%, when 60% breaking load, are 1%, when 50% breaking load, can ignore.In " rock soil anchor (rope) technical manual " (the CECS 22:2005) of China Engineering Construction Standardization Association issue to the monitoring information feedback with the relevant regulations in handling; When the variation of the initial prestress value of the anchor pole of being monitored (rope) greater than axial tension 10% the time, should take repetition stretch-draw or suitably measure such as off-load.And sand-cement slurry compressive strength is 20 MPa in the boring, if the sand-cement slurry structural failure, the frictional resistance of anchor cable and sand-cement slurry can be affected, and influences anchor structure safety.Therefore can be through measuring stressing conditions in anchor cable institute's anchor head and the anchoring body, reaction structure body safe condition.
" application of fiber grating in the prestress wire stress monitoring " " the Harbin Institute of Technology's journal " that Deng Nianchun writes, 2007 10 monthly magazines, the 39th the 10th phase of volume, 1550 ~ 1553.On steel strand wires, directly paste fiber grating or foil gauge, because the special construction of anchor cable, individual wire nonaffine deformation influence produces nonaffine deformation, is difficult to reflect whole bundle anchor cable stressing conditions.
The utility model content
The utility model provides a kind of optical fiber Bragg raster force cell of anchor cable frame combination structure, has avoided directly contacting with the grouting body through optical fiber Bragg raster, can accurately measure whole bundle anchor cable stressing conditions.
The technical scheme that the utility model adopts is: device is made up of anchor head measuring point optical fiber Bragg raster 1, optical fiber 2, anchor pier 3, anchor head anchor clamps 4, anchor cable 5, intermediate plate 6, elastic sensing element 7, backing plate 8, interior pipe 9, outer tube 10, anchor cable boring 11, sand-cement slurry 12, anchoring section measuring point optical fiber Bragg raster 13; Sensor light fiber Bragg grating measuring point comprises anchor head measuring point and anchoring section measuring point, connects through optical fiber 2 between the sensor measuring point; Backing plate 8 is placed at 3 places in advance at anchor cable frame combination structure anchor pier; Intermediate plate 6 locking anchor cables 5; Anchor cable 5 is connected with elastic sensing element 7 through anchor head anchor clamps 4, and anchor head measuring point optical fiber Bragg raster 1 is pasted on the elastic sensing element 7 that is installed in panel grider anchor cable anchor clamps 4 belows vertically; Anchoring section is pasted on place, pipe axis, 9 two ends in the perforate with anchoring section measuring point optical fiber Bragg raster 13 in anchor cable boring 9; Interior pipe 9 is connected with outer tube 10 through screw thread, and sensing arrangement is installed in the anchorage cable anchoring section boring 11 in company with anchor cable 5 and is sealed in the sand-cement slurry 12.
The beneficial effect of the utility model is:
1, realized the on-line measurement of whole pulling force; The utility model is attached to optical fiber Bragg raster on the elastic sensing element, through converting the measurement of anchor cable overall tension to the measurement to the centre wavelength displacement of optical fiber Bragg raster.
2, tubular strain sensing structure is adopted in design, interior pipe and outer effective being threaded, and outer Pipe Flange can better be fixed in the concrete, has avoided the special construction and the influence of anchoring section concrete of anchor cable, the problem that sensitive element can't directly be pasted.Simultaneously, optical fiber Bragg raster is encapsulated in the interior pipe, has avoided directly contacting with the grouting body.
Description of drawings
Fig. 1 is the basic structure synoptic diagram of the utility model;
Among the figure: pipe, 10-outer tube, the boring of 11-anchor cable, 12-sand-cement slurry, 13-anchoring section measuring point optical fiber Bragg raster in 1-anchor head measuring point optical fiber Bragg raster, 2-optical fiber, 3-anchor pier, 4-anchor head anchor clamps, 5-anchor cable, 6-intermediate plate, 7-elastic sensing element, 8-backing plate, the 9-.
Embodiment
Below in conjunction with accompanying drawing and embodiment to the utility model further explain, so that technician's understanding:
As shown in Figure 1; The optical fiber Bragg raster force cell of anchor cable frame combination structure is made up of anchor head measuring point optical fiber Bragg raster 1, optical fiber 2, anchor pier 3, anchor head anchor clamps 4, anchor cable 5, intermediate plate 6, elastic sensing element 7, backing plate 8, interior pipe 9, outer tube 10, anchor cable boring 11, sand-cement slurry 12, anchoring section measuring point optical fiber Bragg raster 13; Sensor light fiber Bragg grating measuring point comprises anchor head measuring point and anchoring section measuring point, connects through optical fiber 2 between the sensor measuring point; Backing plate 8 is placed at 3 places in advance at anchor cable frame combination structure anchor pier; Intermediate plate 6 locking anchor cables 5; Anchor cable 5 is connected with elastic sensing element 7 through anchor head anchor clamps 4, and anchor head measuring point optical fiber Bragg raster 1 is pasted on the elastic sensing element 7 that is installed in panel grider anchor cable anchor clamps 4 belows vertically; Anchoring section is pasted on place, pipe axis, 9 two ends in the perforate with anchoring section measuring point optical fiber Bragg raster 13 in anchor cable boring 9; Interior pipe 9 is connected with outer tube 10 through screw thread, and sensing arrangement is installed in the anchorage cable anchoring section boring 11 in company with anchor cable 5 and is sealed in the sand-cement slurry 12.
The utility model principle of work:
Expose anchored end at anchor cable, overall tension clamps anchor cable by intermediate plate and imposes on elastic sensing element, the dependent variable of ground tackle place elastic sensing element is converted to the wavelength-shift of optical fiber Bragg raster.
In boring; The spatial form of prestress anchorage cable anchoring section is approximately right cylinder; About drill center bobbin symmetry; The strain sensing structure is arranged in anchoring section shear stress maximum position place with anchor cable, and sand-cement slurry produces certain deflection under the stressed effect of side slope, the dependent variable of sand-cement slurry is converted to the wavelength-shift of strain sensing structured light fiber Bragg grating.
Optical fiber Bragg raster is connected with signal processing apparatus through optical fiber, utilizes the (FBG) demodulator of signal processing apparatus to draw the shift value of optical fiber Bragg raster centre wavelength.Obtain the wavelength-shift value that strain causes optical fiber Bragg raster according to (FBG) demodulator, inverse goes out stressed size, realizes wavelength and the stressed corresponding relation of anchor cable.
The mathematical model of the utility model is following:
(1) measurement of anchor cable frame combination structural entity pulling force:
When anchor cable receives axially to draw at the structure that is combined into framed structure, during pressure, slope soil passes to elastic sensing element with power, its compression chord is:
In the formula,
is the sectional area of elastic sensing element.According to Hooke's law, the relation of axial tension
and elastic body strain
is for being expressed as:
In the formula (2),
is the elastic modulus of elastic sensing element.(2) formula substitution (1) formula can be got pulling capacity is:
1 optical fiber Bragg raster is sticked on the elastic sensing element, record strain value
In the following formula;
is the centre wavelength of optical fiber Bragg raster;
is the wavelength-shift amount;
=0.22 is valid round-spectrum number,
be the axial strain amount.
Must concern with the optical fiber Bragg raster wavelength-shift obtaining anchor cable overall tension size in (4) formula substitution (3) formula:
Record strain value
by (4) formula, can calculate the anchor cable overall tension.
(2) anchor cable receives force measurement in the boring of anchor cable frame combination structure anchor section
Side slope is under stress; Being stressed
in the boring cross-sectional area acts on down; Elastic modulus is
, and xsect connects the dependent variable
that the strain sensing structure into
produces under loading at slope soil:
In the formula;
is the centre wavelength of strain sensing structured light fiber Bragg grating, and
is its wavelength-shift amount.
The utility model describes through the practical implementation process; Under the situation that does not break away from the utility model scope; Can also carry out various conversion and be equal to replacement the utility model patent; Therefore, the utility model patent is not limited to disclosed practical implementation process, and should comprise the whole embodiments that fall in the utility model Patent right requirement scope.
Claims (1)
1. the optical fiber Bragg raster force cell of an anchor cable frame combination structure is characterized in that: described sensor is made up of anchor head measuring point optical fiber Bragg raster (1), optical fiber (2), anchor pier (3), anchor head anchor clamps (4), anchor cable (5), intermediate plate (6), elastic sensing element (7), backing plate (8), interior pipe (9), outer tube (10), anchor cable boring (11), sand-cement slurry (12), anchoring section measuring point optical fiber Bragg raster (13); Sensor light fiber Bragg grating measuring point comprises anchor head measuring point and anchoring section measuring point, connects through optical fiber (2) between the sensor measuring point; Locate to place in advance backing plate (8) at anchor cable frame combination structure anchor pier (3); Intermediate plate (6) locking anchor cable (5); Anchor cable (5) is connected with elastic sensing element (7) through anchor head anchor clamps (4), and anchor head measuring point optical fiber Bragg raster (1) is pasted on the elastic sensing element (7) that is installed in panel grider anchor cable anchor clamps (4) below vertically; Anchoring section is pasted on place, pipe (9) axis, two ends in the perforate with anchoring section measuring point optical fiber Bragg raster (13) in anchor cable boring (9); Interior pipe (9) is connected with outer tube (10) through screw thread, and sensing arrangement is installed in the anchorage cable anchoring section boring (11) in company with anchor cable (5) and is sealed in the sand-cement slurry (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205583041U CN202403851U (en) | 2011-12-28 | 2011-12-28 | Fiber Bragg grating load cell of anchor cable frame composite structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205583041U CN202403851U (en) | 2011-12-28 | 2011-12-28 | Fiber Bragg grating load cell of anchor cable frame composite structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202403851U true CN202403851U (en) | 2012-08-29 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205583041U Expired - Fee Related CN202403851U (en) | 2011-12-28 | 2011-12-28 | Fiber Bragg grating load cell of anchor cable frame composite structure |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104848980A (en) * | 2015-06-08 | 2015-08-19 | 武汉理工大学 | Bridge stay cable force online detection method and system based on fiber sensing |
| CN105421501A (en) * | 2015-12-15 | 2016-03-23 | 中国一冶集团有限公司 | Method for monitoring working state of anchor rod and deformation condition of surrounding soil at sludge environment |
| CN106441661A (en) * | 2016-12-02 | 2017-02-22 | 西南交通大学 | Fiber grating force-measuring gasket and anchor rod force-measuring system |
| CN106906824A (en) * | 2015-12-22 | 2017-06-30 | 中国水利水电科学研究院 | Distribution type fiber-optic prestressing force intellectual monitoring anchor cable |
| CN109763850A (en) * | 2019-01-15 | 2019-05-17 | 泰安铭源节能科技有限公司 | A kind of intelligent grouting cable anchor and its detection method |
| CN110686611A (en) * | 2019-10-24 | 2020-01-14 | 天津大学 | Surface subsidence quasi-distributed monitoring device and method based on optical fiber sensing technology |
| CN116952729A (en) * | 2023-09-21 | 2023-10-27 | 北京建筑大学 | Sleeve grouting quality detection device, assembly and use method thereof |
| CN110686611B (en) * | 2019-10-24 | 2024-05-28 | 天津大学 | Surface subsidence quasi-distributed monitoring device and method based on optical fiber sensing technology |
-
2011
- 2011-12-28 CN CN2011205583041U patent/CN202403851U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104848980A (en) * | 2015-06-08 | 2015-08-19 | 武汉理工大学 | Bridge stay cable force online detection method and system based on fiber sensing |
| CN105421501A (en) * | 2015-12-15 | 2016-03-23 | 中国一冶集团有限公司 | Method for monitoring working state of anchor rod and deformation condition of surrounding soil at sludge environment |
| CN106906824A (en) * | 2015-12-22 | 2017-06-30 | 中国水利水电科学研究院 | Distribution type fiber-optic prestressing force intellectual monitoring anchor cable |
| CN106441661A (en) * | 2016-12-02 | 2017-02-22 | 西南交通大学 | Fiber grating force-measuring gasket and anchor rod force-measuring system |
| CN109763850A (en) * | 2019-01-15 | 2019-05-17 | 泰安铭源节能科技有限公司 | A kind of intelligent grouting cable anchor and its detection method |
| CN110686611A (en) * | 2019-10-24 | 2020-01-14 | 天津大学 | Surface subsidence quasi-distributed monitoring device and method based on optical fiber sensing technology |
| CN110686611B (en) * | 2019-10-24 | 2024-05-28 | 天津大学 | Surface subsidence quasi-distributed monitoring device and method based on optical fiber sensing technology |
| CN116952729A (en) * | 2023-09-21 | 2023-10-27 | 北京建筑大学 | Sleeve grouting quality detection device, assembly and use method thereof |
| CN116952729B (en) * | 2023-09-21 | 2024-01-16 | 北京建筑大学 | Sleeve grouting quality detection device, assembly and use method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120829 Termination date: 20141228 |
|
| EXPY | Termination of patent right or utility model |