CN103776386A - Method for pile body deformation distributed measurement of cast-in-place concrete large-diameter tubular pile - Google Patents
Method for pile body deformation distributed measurement of cast-in-place concrete large-diameter tubular pile Download PDFInfo
- Publication number
- CN103776386A CN103776386A CN201410029175.5A CN201410029175A CN103776386A CN 103776386 A CN103776386 A CN 103776386A CN 201410029175 A CN201410029175 A CN 201410029175A CN 103776386 A CN103776386 A CN 103776386A
- Authority
- CN
- China
- Prior art keywords
- optical fiber
- cast
- pile
- place concrete
- diameter tubular
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention discloses a method for pile body deformation distributed measurement of a cast-in-place concrete large-diameter tubular pile. The method comprises the steps that eight optical fiber embedding grooves distributed in a cross mode are reserved when the cast-in-place concrete large-diameter tubular pile is formed; optical fibers are continuously laid in the optical fiber embedding grooves; the optical fibers in the optical fiber embedding grooves are packaged and protected by glue; pile body strain is measured through the Brillouin light and time domain reflection technology. The measuring method has the advantages of being accurate in measurement, strong in continuity, high in survival rate and the like.
Description
Technical field
The present invention relates to a kind of test method of foundation structure, be specifically related to a kind of cast-in-place concrete large-diameter tubular pile pile body deformation distributed measurement method.
Background technology
Cast-in-place concrete large-diameter tubular pile is applicable to soft clay area ground processing, compared with other pile foundation, cast-in-place concrete large-diameter tubular pile not only has that intensity is high, good endurance, bendind rigidity is large and bearing capacity is high feature, and can reduce engineering cost, accelerating construction progress.Or point type detection main to the measurement of in situ concrete pile large-diameter tubular pile pile body deformation, by measuring the strain value of pile body each point, analyzes and obtains pile strain, distribution curve of stress now.Point measurement method is generally by pre-buried strainometer, foil gauge on pile body, and these electronic components of imbedding easily damage in concrete placement.Point measurement method is merely able to the data of the several points that obtain discontinuity, and the distortion of putting to obtain whole pile body by these can not be grasped the deformation rule of whole pile body comprehensively.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the invention provides a kind of cast-in-place concrete large-diameter tubular pile pile body deformation distributed measurement method.
Technical scheme: for solving the problems of the technologies described above, cast-in-place concrete large-diameter tubular pile pile body deformation distributed measurement method provided by the invention, comprises the following steps:
1)) bury groove underground at the reserved optical fiber in pile body surface when cast-in-place concrete large-diameter tubular pile pile, it is eight that axially arrange along pile body that described optical fiber is buried groove underground, comprise four and four of outer wall being relatively arranged at pile body inwall, described eight optical fiber are buried groove underground and be crossing distribution on the xsects of pile body;
2) eight optical fiber are laid in respectively to eight optical fiber continuously and bury underground in groove, with glue compartment of terrain optical fiber and optical fiber bury underground between groove, fix a point to paste fixing;
3) mode to paste comprehensively, the optical fiber that adopts glue to bury underground in groove optical fiber carries out packaging protection;
4) eight optical fiber are connected to fiber data Acquisition Instrument at stake end place, use Brillouin light time domain reflection technology, by utilizing the linear relationship between the suffered axial strain of the frequency displacement variable quantity of the Brillouin scattering in optical fiber and optical fiber to measure pile strain.
Preferably, described step 2) in while pasting optical fiber, optical fiber is micro-stressed, and the glue stickup of fix a point for the 50cm of interval.
Preferably, described optical fiber is buried groove underground width and the degree of depth are 2mm.
Preferably, described optical fiber is 9/125um single-mode fiber.
When use, after cast-in-place concrete large-diameter tubular pile has been built and has been reached predetermined strength, read the primary data of fiber data Acquisition Instrument, in the time that cast-in-place concrete large-diameter tubular pile is subject to external load, again read the data of existing fiber data Acquisition Instrument, the difference of two secondary data is stressed rear the produced logarithmic strain of cast-in-situ major diameter pipe pile, and then can analyze pile body ess-strain.
Beneficial effect: the invention provides a kind of brand-new cast-in-place concrete large-diameter tubular pile pile body deformation distributed measurement method, optical fiber is fixed in the preformed groove of cast-in-place concrete large-diameter tubular pile and along inwall and outer wall and forms decussate texture, record be not subject to before load and be subject to load after the optical fiber measurement data of twice, realize the distributed measurement of pile strain, compared traditional measuring method and there is following advantage:
1) changed traditional point measurement method, the discontinuous monitoring, electronic component that has overcome conventional port monitoring be disturbed, non-watertight, the shortcoming such as survival rate is low easily, realize the distributed measurement of cast-in-place concrete large-diameter tubular pile pile body deformation, can analyze more accurately cast-in-situ major diameter pipe pile pile body ess-strain Changing Pattern, be conducive to optimize the construction technology of cast-in-place concrete large-diameter tubular pile, understand the bearing mechanism of cast-in-place concrete large-diameter tubular pile;
2) Brillouin light time domain reflection technology (BOTDR) can obtain the continuous distribution information on the room and time of measured optical fiber, by burying optical fiber underground at cast-in-place concrete large-diameter tubular pile pile body for the Distributed Detection of deformation of pile foundation, form an optical fiber sensing monitoring system, distortion to cast-in-situ major diameter pipe pile is monitored continuously, the outstanding advantages of this monitoring method is exactly to have changed traditional point type monitoring mode, make up the deficiency of point type monitoring, realized in real time, grown distance and distributed monitoring objective;
3) the reserved optical fiber of the method is buried groove underground, can not reduce the intensity of stake, and the lead-in wire of every optical fiber is only one simultaneously; be sensor and data transmission channel, be more conducive to protection, avoided too many lead-in wire; simplify construction technology, improved the survival rate of sensor.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of the present invention;
Fig. 2 is the A-A sectional view of Fig. 1;
In figure: 1, cast-in-place concrete large-diameter tubular pile, 2, optical fiber.
Embodiment
Embodiment: the cast-in-place concrete large-diameter tubular pile of monitoring in the present embodiment as depicted in figs. 1 and 2, comprise cast-in-place concrete large-diameter tubular pile 1 and optical fiber 2, wherein optical fiber 2 is eight that axially arrange along cast-in-place concrete large-diameter tubular pile 1, comprise four and four of outer wall being relatively arranged at cast-in-place concrete large-diameter tubular pile 1 inwall, eight optical fiber 2 are crossing distribution on the xsect of cast-in-place concrete large-diameter tubular pile.
When use, install and measure according to following steps
1)) bury groove underground at the optical fiber of the reserved 2mm in pile body surface when cast-in-place concrete large-diameter tubular pile pile, it is eight that axially arrange along pile body that optical fiber is buried groove underground, comprise four and four of outer wall being relatively arranged at pile body inwall, eight optical fiber are buried groove underground and be crossing distribution on the xsects of pile body.
2) eight 9/125um single-mode fiber optical fiber being laid in respectively to eight optical fiber continuously buries underground in groove, optical fiber is micro-stressed in the time laying, apply pulling force at the two ends of point of fixity and make it exceptionally straight, and interval 50cm with glue optical fiber and optical fiber bury underground between groove, fix a point to paste fixing.Lay and should first bury groove underground to optical fiber before optical fiber and clear up, paste in order to avoid affect optical fiber.
3) mode to paste comprehensively, the optical fiber that adopts glue to bury underground in groove optical fiber carries out packaging protection;
4) eight optical fiber are connected to fiber data Acquisition Instrument at stake end place, use Brillouin light time domain reflection technology (BOTDR), by utilizing the linear relationship between the suffered axial strain of the frequency displacement variable quantity of the Brillouin scattering in optical fiber and optical fiber to measure pile strain.
When use, after cast-in-place concrete large-diameter tubular pile has been built and has been reached predetermined strength, read the primary data of fiber data Acquisition Instrument, in the time that cast-in-place concrete large-diameter tubular pile is subject to external load, again read fiber data Acquisition Instrument, the difference of two secondary data is stressed rear the produced logarithmic strain of cast-in-situ major diameter pipe pile, and then can analyze pile body ess-strain.
Take above-mentioned foundation desirable embodiment of the present invention as enlightenment, by above-mentioned description, relevant staff can, not departing from the scope of this invention technological thought, carry out various change and modification completely.The technical scope of this invention is not limited to the content on instructions, must determine its technical scope according to claim scope.
Claims (5)
1. a cast-in-place concrete large-diameter tubular pile pile body deformation distributed measurement method, is characterized in that comprising the following steps:
1) bury groove underground at the reserved optical fiber in pile body surface when cast-in-place concrete large-diameter tubular pile pile, it is eight that axially arrange along pile body that described optical fiber is buried groove underground, comprise four and four of outer wall being relatively arranged at pile body inwall, described eight optical fiber are buried groove underground and be crossing distribution on the xsects of pile body;
2) eight optical fiber are laid in respectively to eight optical fiber continuously and bury underground in groove, with glue compartment of terrain optical fiber and optical fiber bury underground between groove, fix a point to paste fixing;
3) mode to paste comprehensively, the optical fiber that adopts glue to bury underground in groove optical fiber carries out packaging protection;
4) eight optical fiber are connected to fiber data Acquisition Instrument at stake end place, use Brillouin light time domain reflection technology, by utilizing the linear relationship between the suffered axial strain of the frequency displacement variable quantity of the Brillouin scattering in optical fiber and optical fiber to measure pile strain.
2. cast-in-place concrete large-diameter tubular pile pile body deformation distributed measurement method according to claim 1, is characterized in that: described step 2) in paste when optical fiber, optical fiber is micro-stressed, and the glue stickup of fix a point for the 50cm of interval.
3. cast-in-place concrete large-diameter tubular pile pile body deformation distributed measurement method according to claim 1, is characterized in that: width and the degree of depth that described optical fiber is buried groove underground are 2mm.
4. cast-in-place concrete large-diameter tubular pile pile body deformation distributed measurement method according to claim 1, is characterized in that: described optical fiber is 9/125um single-mode fiber.
5. cast-in-place concrete large-diameter tubular pile pile body deformation distributed measurement method according to claim 1, it is characterized in that: also comprise that step 5) is after cast-in-place concrete large-diameter tubular pile has been built and reached predetermined strength, read the primary data of fiber data Acquisition Instrument, in the time that cast-in-place concrete large-diameter tubular pile is subject to external load, again read the data of existing fiber data Acquisition Instrument, utilize two secondary data to analyze pile body ess-strain.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410029175.5A CN103776386A (en) | 2014-01-22 | 2014-01-22 | Method for pile body deformation distributed measurement of cast-in-place concrete large-diameter tubular pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410029175.5A CN103776386A (en) | 2014-01-22 | 2014-01-22 | Method for pile body deformation distributed measurement of cast-in-place concrete large-diameter tubular pile |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103776386A true CN103776386A (en) | 2014-05-07 |
Family
ID=50568914
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410029175.5A Pending CN103776386A (en) | 2014-01-22 | 2014-01-22 | Method for pile body deformation distributed measurement of cast-in-place concrete large-diameter tubular pile |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103776386A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106290377A (en) * | 2016-07-29 | 2017-01-04 | 长安大学 | A kind of Bridge Crack Monitoring early warning system and method for early warning |
| CN110440696A (en) * | 2019-08-06 | 2019-11-12 | 山西省交通新技术发展有限公司 | A kind of side slope deep continuous dislocation monitoring device and method |
| CN112547440A (en) * | 2020-11-30 | 2021-03-26 | 华中科技大学鄂州工业技术研究院 | Glue filling clamp for wire passing bolt |
| CN114111575A (en) * | 2021-11-23 | 2022-03-01 | 武汉市中心工程检测有限公司 | Pile position deviation detection method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1888330A (en) * | 2006-07-25 | 2007-01-03 | 南京大学 | Bored concrete pile foundation distributing optical fiber sensing detecting method and system |
| CN1900434A (en) * | 2006-07-25 | 2007-01-24 | 南京大学 | Distributive optical fiber detecting method and system for prefabricated pile damage |
| KR20110075680A (en) * | 2009-12-28 | 2011-07-06 | 한국철도기술연구원 | Apparatus and method of distributed fiber sensor using brillouin optical time domain analysis based on brillouin dynamic grating |
-
2014
- 2014-01-22 CN CN201410029175.5A patent/CN103776386A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1888330A (en) * | 2006-07-25 | 2007-01-03 | 南京大学 | Bored concrete pile foundation distributing optical fiber sensing detecting method and system |
| CN1900434A (en) * | 2006-07-25 | 2007-01-24 | 南京大学 | Distributive optical fiber detecting method and system for prefabricated pile damage |
| KR20110075680A (en) * | 2009-12-28 | 2011-07-06 | 한국철도기술연구원 | Apparatus and method of distributed fiber sensor using brillouin optical time domain analysis based on brillouin dynamic grating |
Non-Patent Citations (1)
| Title |
|---|
| 江宏: "PPP-BOTDA分布式光纤传感技术及其在试桩中应用", 《岩土力学》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106290377A (en) * | 2016-07-29 | 2017-01-04 | 长安大学 | A kind of Bridge Crack Monitoring early warning system and method for early warning |
| CN110440696A (en) * | 2019-08-06 | 2019-11-12 | 山西省交通新技术发展有限公司 | A kind of side slope deep continuous dislocation monitoring device and method |
| CN112547440A (en) * | 2020-11-30 | 2021-03-26 | 华中科技大学鄂州工业技术研究院 | Glue filling clamp for wire passing bolt |
| CN114111575A (en) * | 2021-11-23 | 2022-03-01 | 武汉市中心工程检测有限公司 | Pile position deviation detection method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106524936B (en) | Tunnel pipe shed deformation monitoring method | |
| CN103821507B (en) | Shaft wall distortion distribution type fiber-optic detection method | |
| Zhu et al. | A novel distributed optic fiber transduser for landslides monitoring | |
| CN1888330B (en) | Bored concrete pile foundation distributing optical fiber sensing detecting method | |
| CN103669429B (en) | Based on the circular solids concrete pile pile strain monitoring method of FBG sensor | |
| CN106546218B (en) | A kind of high mountain permafrost differentiation cloth subgrade settlement monitoring system and method | |
| CN107063107A (en) | Tunnel wall rock deformation distributed optical fiber sensing system and construction, monitoring method | |
| CN103776386A (en) | Method for pile body deformation distributed measurement of cast-in-place concrete large-diameter tubular pile | |
| JP5512462B2 (en) | Method for measuring longitudinal distribution of bending loss of optical fiber and optical fiber line, optical line test method, and optical fiber manufacturing method | |
| CN107063108B (en) | A method of test sensing optic cable and soil deformation harmony | |
| CN106759548B (en) | Monitoring system and monitoring method for grid anchor rod support cutting | |
| CN103759666A (en) | Device and method for monitoring pile body strain of round solid pile | |
| CN1598479A (en) | Distribution type optical fibre measuring method and system for deep deformation of soil | |
| CN101915552A (en) | Method for measuring geogrid deformation and stress by utilizing fiber bragg grating | |
| CN102183211A (en) | Sensor and method for measuring road surface excessive pore water pressure by using same | |
| CN103741728B (en) | Based on the cast-in-situ concrete large-diameter tubular pile pile strain monitoring method of FBG sensor | |
| CN108020167A (en) | A kind of stationary slope level device based on fiber grating | |
| CN110319862A (en) | A kind of helical structure device for distributing optical fiber sensing in civil engineering | |
| CN103759665A (en) | Distributed measurement device and method of pile body deformation of cast-in-place X-type pile | |
| CN106959302A (en) | A kind of pile body integrity detection system and method based on low coherence interference technology | |
| CN102278948B (en) | Compound optical fiber sensing monitoring system and method based on optical fiber compound sensing module | |
| CN104897457A (en) | On-site roadbed dynamic response testing method and system thereof | |
| CN105910580A (en) | Distributed fiber Bragg grating inclinometer device and inclination metering method | |
| CA2989301A1 (en) | Method for measuring the displacement profile of buildings and sensor therefor | |
| CN204556369U (en) | A kind of test unit of on-the-spot test roadbed dynamic response |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20140507 |