CN108895975A - Cement mixing method pile strain monitoring method based on FBG sensor - Google Patents
Cement mixing method pile strain monitoring method based on FBG sensor Download PDFInfo
- Publication number
- CN108895975A CN108895975A CN201810540212.7A CN201810540212A CN108895975A CN 108895975 A CN108895975 A CN 108895975A CN 201810540212 A CN201810540212 A CN 201810540212A CN 108895975 A CN108895975 A CN 108895975A
- Authority
- CN
- China
- Prior art keywords
- fbg
- cement mixing
- pvc pipe
- mixing method
- metal tube
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
- G01B11/165—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge by means of a grating deformed by the object
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The cement mixing method pile strain monitoring method based on FBG sensor that the present invention provides a kind of, includes the following steps：FBG sensor is buried on pvc pipe, the optic fibre wire of FBG sensor is drawn by pvc pipe；Inbuilt FBG sensor and the sealing of pvc pipe junction are fixed；After the completion of cement mixing method stirring, the diameter metal tube more bigger than pvc pipe is entangled with drill bit, the metal tube for being cased with drill bit is pressed into vertically in the pile body of cement mixing method by drawing equipment；It is pressed into after metal tube to predetermined depth, the pvc pipe for having buried FBG sensor is put into metal tube；Metal tube is tightened with rope, is classified vertical extraction metal tube with drawing equipment；By the end incoming fiber optic grating demodulation instrument of optical fiber；Front and back is loaded vertically in cement mixing method, and the pile strain of cement mixing method is calculated using the monitoring data of fiber Bragg grating (FBG) demodulator acquisition.The present invention has the advantages that survival rate is high, with high accuracy.
Description
Technical field
The invention belongs to geotechnical engineering monitoring technical fields, are related to a kind of cement mixing method pile strain monitoring method,
Especially a kind of cement mixing method pile strain monitoring method based on FBG sensor.
Background technique
Cement mixing method is a kind of pile-type being widely used in treatment of soft foundation, has the construction period fast, at low cost,
The advantages that use scope is wide, and mechanization degree is high.Currently, the traditional approach of monitoring cement mixing method pile strain is to utilize to answer
Become piece or vibrating string extensometer to monitor pile body deformation, by strain is measured data are acquired and analyze, to reach
The purpose of monitoring.The above method has some limitations, and one, the method are usually to drill after pile one month, is put into
The cement soil physical property near pvc pipe grouting behind shaft or drift lining, foil gauge or strain gauge has differences with pile body；Secondly, foil gauge or
Person's strain gauge survival rate is low, measuring accuracy is low, drift is big, stability is poor；Thirdly, common vibrating string extensometer rigidity and cement
Mixing pile rigidity difference is larger, and there are stress concentration phenomenon, test result cannot reflect that truth, precision are lower.
In conclusion needing to design, a kind of survival rate is high, cement mixing method pile strain monitoring method with high accuracy.
Summary of the invention
The purpose of the present invention is there is the above problem in view of the prior art, it is high, with high accuracy to propose a kind of survival rate
Cement mixing method pile strain monitoring method based on FBG sensor.
Object of the invention can be realized by the following technical scheme：A kind of cement mixing method based on FBG sensor
Pile strain monitoring method, includes the following steps：
The position that FBG sensor is reserved on pvc pipe, buries FBG sensor on pvc pipe, and the optical fiber of FBG sensor is led
Line is drawn by pvc pipe；
Inbuilt FBG sensor and the sealing of pvc pipe junction are fixed；
After the completion of cement mixing method stirring, the diameter metal tube more bigger than pvc pipe is entangled with drill bit, is set by drawing
It is standby to be pressed into the metal tube for being cased with drill bit vertically in the pile body of cement mixing method；
It is pressed into after metal tube to predetermined depth, the pvc pipe for having buried FBG sensor is put into metal tube；
After placing pvc pipe, metal tube is tightened with rope, is classified vertical extraction metal tube with drawing equipment；
By the end incoming fiber optic grating demodulation instrument of optical fiber；
Front and back is loaded vertically in cement mixing method, calculates soil cement using the monitoring data of fiber Bragg grating (FBG) demodulator acquisition
The pile strain of mixing pile.
As a further improvement of the present invention, FBG sensor includes FBG temperature sensor and FBG strain transducer,
FBG temperature sensor and FBG strain transducer are buried on pvc pipe, and each inbuilt FBG strain transducer is nearby equipped with
FBG temperature sensor.
As a further improvement of the present invention, the rigidity of the FBG sensor is close to soil cement rigidity.
As a further improvement of the present invention, inbuilt FBG sensor and pvc pipe junction are sealed with adhesive plaster fixes.
As a further improvement of the present invention, drill bit has conical section and the conical section is closed.
As a further improvement of the present invention, after drawing equipment extracts metal tube, drill bit is stayed in cement mixing method.
Based on the above-mentioned technical proposal, the embodiment of the present invention at least can produce following technical effect：It is above-mentioned to be sensed based on FBG
The cement mixing method pile strain monitoring method design of device rationally, and connects cooperation closely between each step, and this case is in PVC
FBG sensor is buried on pipe, will be cased in the metal tube indentation cement mixing method of drill bit with drawing equipment, pvc pipe is put into
In metal tube, metal tube is extracted with drawing equipment vertically, by the end incoming fiber optic grating demodulation instrument of optical fiber, and calculates cement
Native mixing pile pile strain, using property of cement soil and pile body other positions one around the sensor of monitoring method of the invention
It causes, can obtain and more meet actual data, the FBG sensor high survival rate that this method uses, good waterproof performance, measurement accuracy
Height, small and stability of drifting about is good, and data measured can more reflect pile body practical distortion, has preferable market application prospect.
Detailed description of the invention
Specific embodiments of the present invention will be described in further detail with reference to the accompanying drawing, wherein：
Fig. 1 is to have buried the pvc pipe of FBG sensor in a preferred embodiment of the present invention to be placed in knot in cement mixing method
Structure schematic diagram.
Fig. 2 is the structural schematic diagram that the metal tube of drill bit is cased in a preferred embodiment of the present invention.
Fig. 3 is the structural schematic diagram that the pvc pipe of FBG sensor is embedded in a preferred embodiment of the present invention.
In figure, 100, pvc pipe；210, FBG temperature sensor；220, FBG strain transducer；300, cement mixing method；
400, drill bit；500, metal tube.
Specific embodiment
Following is a specific embodiment of the present invention in conjunction with the accompanying drawings, technical scheme of the present invention will be further described,
However, the present invention is not limited to these examples.
Technical solution provided by the invention is illustrated in more detail below with reference to Fig. 1 to Fig. 3.
In conjunction with shown in Fig. 1 to Fig. 3, based on the cement mixing method pile strain monitoring method of FBG sensor, including with
Lower step：
Step 1: reserving the position of FBG sensor on pvc pipe 100, FBG sensor, FBG are buried on pvc pipe 100
The optic fibre wire of sensor is drawn by pvc pipe 100；Wherein, pvc pipe 100 can be connected when stake is longer, the light of sensor
Fine conducting wire is drawn by pvc pipe 100；
Step 2: inbuilt FBG sensor and the sealing of 100 junction of pvc pipe are fixed；
Step 3: it is more bigger than pvc pipe 100 to entangle diameter with drill bit 400 after the completion of cement mixing method 300 stirs
The metal tube 500 for being cased with drill bit 400 is pressed into the pile body of cement mixing method 300 by drawing equipment by metal tube 500 vertically
It is interior, fixation is preferably bolted between metal tube 500；
Step 4: the pvc pipe 100 for having buried FBG sensor is put into gold after the indentation to predetermined depth of metal tube 500
Belong in pipe 500；
Step 5: metal tube 500 is tightened after placing pvc pipe 100 with rope, be classified vertical extract with drawing equipment
Metal tube 500；
Step 6: by the end incoming fiber optic grating demodulation instrument of optical fiber；
Step 7: utilizing the monitoring data of fiber Bragg grating (FBG) demodulator acquisition before and after cement mixing method 300 vertically load
Calculate the pile strain of cement mixing method 300.
Above-mentioned pvc pipe 100 is pipe structure made from synthetic material of the polyvinyl chloride for main materials synthesis, FBG sensor
That is fibre optical sensor has optic fibre wire.
The present invention protects a kind of cement mixing method pile strain monitoring method based on FBG sensor, design rationally and
Connection cooperation is close between each step, and FBG sensor is buried in this case on pvc pipe 100, will be cased with drill bit with drawing equipment
400 metal tube 500 is pressed into cement mixing method 300, and pvc pipe 100 is put into metal tube 500, will be golden with drawing equipment
Belong to pipe 500 to extract vertically, by the end incoming fiber optic grating demodulation instrument of optical fiber, and calculates cement mixing method pile strain, adopt
It is consistent with pile body other positions with property of cement soil around the sensor of monitoring method of the invention, it can obtain and more meet reality
Data, the FBG sensor high survival rate that this method uses, good waterproof performance, measurement accuracy is high, and small and stability of drifting about is good, surveys
Pile body practical distortion can more be reflected by obtaining data, have preferable market application prospect.
As a kind of preferred or optional embodiment, FBG sensor includes that FBG temperature sensor 210 and FBG strain pass
Sensor 220 in step 1, buries FBG temperature sensor 210 and FBG strain transducer 220 on pvc pipe 100, sensor
Optic fibre wire is drawn by pvc pipe 100.
Each inbuilt FBG strain transducer 220 is nearby equipped with FBG temperature sensor 210.I.e. in FBG sensor, often
There should be FBG temperature sensor beside a inbuilt FBG strain transducer, be used for temperature-compensating.
Preferably, the rigidity of FBG sensor avoids the occurrence of stress concentration phenomenon close to soil cement rigidity.
Further, in step 2, adhesive plaster (mackintosh) is preferably used in inbuilt FBG sensor and 100 junction of pvc pipe
Sealing is fixed.
Preferably, drill bit 400 has conical section (i.e. conical nose part) and the conical section is closed, and prevents soil cement
Enter in process of press in from cone.
Further, it does not fix directly between the drill bit 400 in this case and metal tube 500, is extracted in drawing equipment
After metal tube 500, drill bit 400 is stayed in cement mixing method 300, i.e., drill bit 400 can not take after being pressed into cement mixing method 300
Out.
In conclusion the present invention completes the embedded of FBG sensor, specific embodiment in Soil-cement stake body
For：Reserve FBG temperature sensor and the inbuilt position of FBG strain transducer in advance on pvc pipe, the optic fibre wire of sensor is logical
Cross pvc pipe extraction；It is strained with mackintosh with the junction between fixing PVC pipe and the FBG temperature sensor and FBG buried
Sensor；After the completion of cement-soil stirring pile construction, the diameter group metal tube bigger than pvc pipe is entangled with drill bit, uses drawing equipment
Metal tube is pressed into cement mixing method vertically, fixation is bolted between metal tube；It is pressed into metal tube to predetermined
Depth after, the pvc pipe for having buried sensor is put into metal tube；After placing pvc pipe, metal tube is tightened with rope,
Vertical extract is classified with drawing equipment；By the end incoming fiber optic grating demodulation instrument of optical fiber；Before cement mixing pile vertically loads
Afterwards, the monitoring data acquired using fiber Bragg grating (FBG) demodulator, calculate the pile strain of cement mixing pile.
Specific embodiment described herein is only an example for the spirit of the invention.The neck of technology belonging to the present invention
The technical staff in domain can make various modifications or additions to the described embodiments or replace by a similar method
In generation, however, it does not deviate from the spirit of the invention or beyond the scope of the appended claims.
Claims (6)
1. a kind of cement mixing method pile strain monitoring method based on FBG sensor, it is characterised in that：Including following step
Suddenly：
The position that FBG sensor is reserved on pvc pipe, buries FBG sensor on pvc pipe, and the optic fibre wire of FBG sensor is logical
Cross pvc pipe extraction；
Inbuilt FBG sensor and the sealing of pvc pipe junction are fixed；
After the completion of cement mixing method stirring, the diameter metal tube more bigger than pvc pipe is entangled with drill bit, it will by drawing equipment
The metal tube for being cased with drill bit is pressed into vertically in the pile body of cement mixing method；
It is pressed into after metal tube to predetermined depth, the pvc pipe for having buried FBG sensor is put into metal tube；
After placing pvc pipe, metal tube is tightened with rope, is classified vertical extraction metal tube with drawing equipment；
By the end incoming fiber optic grating demodulation instrument of optical fiber；
Front and back is loaded vertically in cement mixing method, calculates Soil-cement using the monitoring data of fiber Bragg grating (FBG) demodulator acquisition
The pile strain of stake.
2. the cement mixing method pile strain monitoring method according to claim 1 based on FBG sensor, feature exist
In：FBG sensor includes FBG temperature sensor and FBG strain transducer, and FBG temperature sensor and FBG are buried on pvc pipe
Strain transducer, and each inbuilt FBG strain transducer is nearby equipped with FBG temperature sensor.
3. the cement mixing method pile strain monitoring method according to claim 1 or 2 based on FBG sensor, special
Sign is：The rigidity of the FBG sensor is close to soil cement rigidity.
4. the cement mixing method pile strain monitoring method according to claim 1 based on FBG sensor, feature exist
In：Inbuilt FBG sensor and pvc pipe junction are sealed with adhesive plaster to be fixed.
5. the cement mixing method pile strain monitoring method according to claim 1 based on FBG sensor, feature exist
In：Drill bit has conical section and the conical section is closed.
6. the cement mixing method pile strain monitoring side described according to claim 1 or 2 or 4 or 5 based on FBG sensor
Method, it is characterised in that：After drawing equipment extracts metal tube, drill bit is stayed in cement mixing method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810540212.7A CN108895975A (en) | 2018-05-30 | 2018-05-30 | Cement mixing method pile strain monitoring method based on FBG sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810540212.7A CN108895975A (en) | 2018-05-30 | 2018-05-30 | Cement mixing method pile strain monitoring method based on FBG sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108895975A true CN108895975A (en) | 2018-11-27 |
Family
ID=64343534
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810540212.7A Pending CN108895975A (en) | 2018-05-30 | 2018-05-30 | Cement mixing method pile strain monitoring method based on FBG sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108895975A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110031325A (en) * | 2019-05-28 | 2019-07-19 | 佛山市禅城区建设工程质量安全检测站 | A kind of pile stress test system and method |
| CN111044369A (en) * | 2020-01-02 | 2020-04-21 | 大连理工大学 | Temperature control optical fiber-soil body drawing test device and use method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103673911A (en) * | 2013-12-12 | 2014-03-26 | 河海大学 | Cast-in-place concrete major-diameter pipe pile body strain monitoring method based on BOTDA |
| CN103669429A (en) * | 2013-12-12 | 2014-03-26 | 河海大学 | Round solid concrete pile body strain monitoring method based on FBG sensor |
| CN103741728A (en) * | 2014-01-22 | 2014-04-23 | 河海大学 | On-site concrete large-diameter pipe pile strain monitoring method based on FBG sensors |
| CN103774702A (en) * | 2014-01-22 | 2014-05-07 | 河海大学 | Cast-in-place X-type concrete pile body strain monitoring method based on FBG (Fiber Bragg Grating) sensor |
| CN106918550A (en) * | 2017-04-21 | 2017-07-04 | 青岛理工大学 | Method for monitoring corrosion of steel bar by optical fiber sensing |
-
2018
- 2018-05-30 CN CN201810540212.7A patent/CN108895975A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103673911A (en) * | 2013-12-12 | 2014-03-26 | 河海大学 | Cast-in-place concrete major-diameter pipe pile body strain monitoring method based on BOTDA |
| CN103669429A (en) * | 2013-12-12 | 2014-03-26 | 河海大学 | Round solid concrete pile body strain monitoring method based on FBG sensor |
| CN103741728A (en) * | 2014-01-22 | 2014-04-23 | 河海大学 | On-site concrete large-diameter pipe pile strain monitoring method based on FBG sensors |
| CN103774702A (en) * | 2014-01-22 | 2014-05-07 | 河海大学 | Cast-in-place X-type concrete pile body strain monitoring method based on FBG (Fiber Bragg Grating) sensor |
| CN106918550A (en) * | 2017-04-21 | 2017-07-04 | 青岛理工大学 | Method for monitoring corrosion of steel bar by optical fiber sensing |
Non-Patent Citations (1)
| Title |
|---|
| 李希宁: "《黄河治理实践与科学研究》", 30 September 2006, 黄河水利出版社 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110031325A (en) * | 2019-05-28 | 2019-07-19 | 佛山市禅城区建设工程质量安全检测站 | A kind of pile stress test system and method |
| CN111044369A (en) * | 2020-01-02 | 2020-04-21 | 大连理工大学 | Temperature control optical fiber-soil body drawing test device and use method thereof |
| CN111044369B (en) * | 2020-01-02 | 2024-05-03 | 大连理工大学 | Temperature control optical fiber-soil body drawing test device and application method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107328921B (en) | A kind of grout sleeve grouting material plumpness detection device and method | |
| CN103953025B (en) | Measure equipment and the method to set up thereof of Deep Thick Soft Ground or covering layer delaminating deposition | |
| CN105971647B (en) | A kind of multi-functional FRP intelligent anchor rods of single-point temperature compensation and preparation method thereof | |
| CN102943493B (en) | Method for measuring internal force and deformation of precast pile | |
| CN204730824U (en) | A kind of distributed settlement measuring device | |
| CN105424910B (en) | Device for measuring layered settlement of soil mass | |
| CN105043345B (en) | A kind of distributed settlement measuring device and measuring method | |
| CN101793502A (en) | Method for detecting breakage position of built-in geomembrane by fiber strain | |
| CN108895975A (en) | Cement mixing method pile strain monitoring method based on FBG sensor | |
| CN101799430A (en) | Built-in anti-seepage geomembrane damage monitoring method based on optical fiber temperature-measurement principle | |
| CN107024183A (en) | Exploring Loose Rock Country in Tunnels range test method and system | |
| CN102278948B (en) | Compound optical fiber sensing monitoring system and method based on optical fiber compound sensing module | |
| CN107642111A (en) | Pile end resistance testing method for open-end PHC (prestressed high-strength concrete) pipe pile | |
| CN110468887A (en) | A kind of miniature steel pipe stake body soil pressure and displacement monitoring method | |
| CN110485482A (en) | A kind of miniature steel pipe stake body soil pressure and displacement monitor | |
| CN103541339A (en) | Pull rod type testing device and method for unsaturated undisturbed loess slope soil pressure | |
| CN109141271A (en) | Multi-point type optical fiber grating bottom hole strain gauge | |
| CN202430702U (en) | Probe based on multifunctional piezocone penetration test | |
| Askarinejad et al. | A novel technique to monitor subsurface movements of landslides | |
| CN104897321B (en) | Wall shearing stress method of testing in a kind of pre-formed members concrete tubular pile pile body | |
| CN104406536B (en) | The test device and method of pile net structure GSZ amount of deflection distribution | |
| CN207228185U (en) | Open-end PHC tubular pile end resistance testing device | |
| CN206959798U (en) | Exploring Loose Rock Country in Tunnels range test system | |
| CN110485388A (en) | Hydraulic tunnel dynamic water-pressure monitoring of structures and method based on kinetic head correction | |
| CN207215032U (en) | Deeply mixing cement-soil pile monitoring system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for 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: 20181127 |