CN104374331A - Optical fiber testing method for monitoring SMW construction method inward inserted H type steel deformation - Google Patents
Optical fiber testing method for monitoring SMW construction method inward inserted H type steel deformation Download PDFInfo
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- CN104374331A CN104374331A CN201410657200.4A CN201410657200A CN104374331A CN 104374331 A CN104374331 A CN 104374331A CN 201410657200 A CN201410657200 A CN 201410657200A CN 104374331 A CN104374331 A CN 104374331A
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Abstract
The invention discloses an optical fiber testing method for monitoring SMW construction method inward inserted H type steel deformation. Before H-shaped steel is inserted into a cement stirring pile, two optical fibers are arranged the corners of flanges and a web respectively to form two U-shaped loops, and protection is carried out through a steel plate and angle iron. Data of optical fibers distributed on the H-shaped steel are measured through the Brillouin Optical Time Domain Reflectometer (BOTDR) technology. By means of the method, the survival rate of the optical fibers is increased, the project implementing is easy, corrosion can be resisted, the testing precision and stability are high, and certain superiority is achieved.
Description
Technical field
The present invention relates to the method for testing of a kind of Geotechnical Engineering field foundation pit supporting construction, be specifically related to a kind of optical fiber test method of monitoring the distortion of SMW engineering method interpolation H profile steel.
Background technology
The traditional approach of monitoring SMW engineering method interpolation H profile steel distortion utilizes tiltmeter to monitor soil deformation after pile body or stake, or use foil gauge, and the steel plate of H profile steel is fixed the foil gauge of some.By measuring data gather and analyze to strain, to reach the object of monitoring.Above-mentioned several method has some limitations: 1. the method that traditional deviational survey is measured needs more manpower, and elapsed time is long, and inclinometer pipe is easily protected improper and causes destroying in excavation engineering; 2. utilize strainometer to measure pile body distortion, strain gauge adhesion is in H profile steel, and connecting lead wire is more, and easily damages.3. strainometer can only monitor the strain of some point of H profile steel, and can not monitor the continuous strain of whole H profile steel.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the invention provides a kind of optical fiber test method of monitoring the distortion of SMW engineering method interpolation H profile steel.
Technical scheme: for solving the problems of the technologies described above, the invention provides a kind of optical fiber test method of monitoring the distortion of SMW engineering method interpolation H profile steel, utilize Fibre Optical Sensor and BOTDR optical fiber sensing monitoring technology to monitor the strain of SMW engineering method interpolation H profile steel, comprise following steps:
(1) the first optical fiber and the second optical fiber is laid respectively in the web both sides of H profile steel, the junction on H profile steel web side and the edge of a wing is close to by described first optical fiber, and take the shape of the letter U bending in the bottom of H profile steel, described second outer fiber is arranged with hard tube, described hard tube is close to the junction on web opposite side and the edge of a wing, and takes the shape of the letter U bending in the bottom of H profile steel;
(3) be coated with last layer at the position of stickup first optical fiber and the second optical fiber evenly and have certain thickness AB glue, then be coated with one deck epoxy resin, the object of epoxy resin be in order to be beneficial to optical fiber laying and fixing, single-mode fiber is laid and forms U-shaped loop;
(4) first optical fiber and the second optical fiber two ends exceed H profile steel top 0.5m-1m, are then coated with epoxy resin in the exposed portion of the first optical fiber and the second optical fiber, then put a cotton mass at port and protect;
(5) at the H profile steel edge of a wing and web corner Plate Welding, in web bottom, weld with angle steel;
(6) according to working procedure, H profile steel is inserted in cement mixing pile, build collar tie beam;
(6) make the first optical fiber and the second optical fiber expose collar tie beam certain length, and carry out mark;
(7) by the first optical fiber and the second intelligent acess BOTDR data monitoring instrument, related data information is obtained.
As preferably, for the ease of optical fiber is pasted and fixed on assigned address, before described step (1), the intersection emery cloth of the H profile steel edge of a wing and web is manually eliminated rust or carries out power rust cleaning with abrasive machine.
As preferably, in order to avoid optical fiber fractures in bottom, to the first optical fiber bottom H profile steel and the second optical fiber smooth curved in described step (1).
As preferably, when H profile steel inserts cement mixing pile, cause optical fiber to destroy due to huge friction force, described step (5) light plate, angle steel weld the chamber being formed and close with H profile steel.
As preferably, described second optical fiber is temperature-compensated fiber.
As preferably, described first optical fiber is 9/125um single-mode fiber.
Inventive principle: before H profile steel inserts cement mixing pile, lays 9/125um single-mode fiber on the edge of a wing and web corner, utilizes Brillouin light time domain reflection technology (being called for short BOTDR) to measure the data being laid in optical fiber in H profile steel.After pulse laser injection fibre, with acoustical phonon effect generation Brillouin scattering, the frequency drift amount of Brillouin scattering and the strain of optical fiber or temperature variation have good linear relationship, according to this linear relationship, the measurement to fibre strain and temperature just can be realized by the Brillouin shift amount in measuring optical fiber.
Beneficial effect: method of testing of the present invention adopts optical fiber as the sensor of monitoring SMW engineering method interpolation H profile steel distortion, application Brillouin scattering time domain reflectometry (BOTDR) gathers the deformation data of H profile steel, and BOTDR fiber optic monitoring technology can realize the measurement of fibre strain and temperature.This method of testing can be used for the high precision strain monitoring of SMW engineering method interpolation H profile steel distortion, has the following advantages:
(1) step is simple, easy to operate, easy for installation, is easy to learn and use;
(2) measuring distance is large, and resolution is high, can realize temperature self-compensation function;
(3) deformation information of every bit in SMW engineering method interpolation H profile steel can be obtained;
(4) economize with material, economize on the use of funds, cost performance is good, has vast potential for future development.
Except technical matters, the technical characteristic forming technical scheme and the advantage brought by the technical characteristic of these technical schemes that the present invention recited above solves, the advantage that the other technologies feature comprised in the other technologies problem that the optical fiber test method that a kind of SMW of monitoring engineering method interpolation H profile steel of the present invention is out of shape can solve, technical scheme and these technical characteristics bring, will be described in more detail by reference to the accompanying drawings.
Accompanying drawing explanation
Fig. 1 is the vertical view of SMW engineering method interpolation H profile steel in the embodiment of the present invention;
Fig. 2 is the facade section of Fig. 1;
Fig. 3 is the left view of Fig. 2
In figure: 1 edge of a wing, 2 webs, 3 optical fiber, 4 steel plates, 5 plastic rigid pipes, 6 angle steel, 7 mixing piles.
Embodiment
Embodiment:
The mounting structure of the present embodiment application fiber-optic monitoring SMW engineering method interpolation H profile steel distortion as shown in Figure 1, Figure 2 and Figure 3, comprise H profile steel and mixing pile 7, be equipped with optical fiber 3 in the side on the edge of a wing 1 of H profile steel downwards along web 2, optical fiber 3 takes the shape of the letter U bending and upwards lays along web 2 after arriving web 2 bottom.Opposite side on the edge of a wing 1 of H profile steel is equipped with the optical fiber 3 having overlapped plastic rigid pipe 5 downwards along web 2, ensure that optical fiber 3 does not stress, and also take the shape of the letter U after arriving bottom laying.Be welded with steel plate between the edge of a wing 1 outside optical fiber 3 and web 2, be welded with angle steel 6 in the bottom of web 2, form the protection of outer fiber.
During construction, material requested comprises H profile steel, Fibre Optical Sensor, AB glue, emery cloth, fiber optic protection tubule, epoxy resin, cotton, steel plate, angle steel, arc welding.
Implementation process is as follows: polish needing the U-rail place emery cloth of laying optical fiber sensor, the position of steel structure surface projection is polished a little and does certain removing work, then last layer AB glue is coated with on surface, fundamental purpose is filled and led up by steel structure surface, and provide certain viscosity, after a while, after AB adhesive curing, on AB glue, be coated with one deck epoxy resin again, be conducive to laying of optical fiber like this.Make it micro-to be stressedly slowly placed in stretching for Fibre Optical Sensor on the U-rail that sets, be placed on U-rail after another root optical fiber being inserted in plastic rigid pipe (ensureing that optical fiber does not stress), then continue to smear one deck epoxy resin and be used for fixing.Epoxy resin has good cohesive strength and chemical-resistance, plays well bonding and protective effect to Fibre Optical Sensor.Place a cotton and shield burying port underground.Steel plate is welded by shown in accompanying drawing with angle steel; so just good for optical fiber closed protective is got up, H profile steel is inserted in mixing pile, stake head-end fiber optic is respectively reserved the length of one meter; and with fiber optic protection tubule, it is protected, protect it not to be damaged.Make the connection of itself and external unit effectively convenient.By Fiber connection on BOTDR fiber data Acquisition Instrument, by gathering the strain information of every bit on optical fiber, the strain of every bit in H profile steel just can be measured.The present invention can monitor the strain information of every bit in H profile steel by means of only an optical fiber, and can receive BOTDR fiber data Acquisition Instrument, realizes the deformation of remote testing H profile steel.In Bracing Process, when the stake of SMW engineering method is subject to the power of barricade applying, measured the optical fiber situation of change of diverse location by BOTDR fiber data Acquisition Instrument.
Below by reference to the accompanying drawings embodiments of the present invention are described in detail, but the present invention is not limited to described embodiment.For those of ordinary skill in the art, in the scope of principle of the present invention and technological thought, embodiment is carried out to these embodiments and carries out multiple change, amendment, replacement and distortion and still fall within the scope of protection of the present invention.
Claims (6)
1. monitor an optical fiber test method for SMW engineering method interpolation H profile steel distortion, it is characterized in that utilizing Fibre Optical Sensor and BOTDR optical fiber sensing monitoring technology to monitor the strain of SMW engineering method interpolation H profile steel, comprise following steps:
(1) the first optical fiber and the second optical fiber is laid respectively in the web both sides of H profile steel, the junction on H profile steel web side and the edge of a wing is close to by described first optical fiber, and take the shape of the letter U bending in the bottom of H profile steel, described second outer fiber is arranged with hard tube, described hard tube is close to the junction on web opposite side and the edge of a wing, and takes the shape of the letter U bending in the bottom of H profile steel;
(3) be coated with last layer at the position of stickup first optical fiber and the second optical fiber evenly and have certain thickness AB glue, then be coated with one deck epoxy resin, single-mode fiber is laid and forms U-shaped loop;
(4) first optical fiber and the second optical fiber two ends exceed H profile steel top 0.5m-1m, are then coated with epoxy resin in the exposed portion of the first optical fiber and the second optical fiber, then put a cotton mass at port and protect;
(5) at the H profile steel edge of a wing and web corner Plate Welding, in web bottom, weld with angle steel;
(6) according to working procedure, H profile steel is inserted in cement mixing pile, build collar tie beam;
(6) make the first optical fiber and the second optical fiber expose collar tie beam certain length, and carry out mark;
(7) by the first optical fiber and the second intelligent acess BOTDR data monitoring instrument, related data information is obtained.
2. a kind of optical fiber test method of monitoring the distortion of SMW engineering method interpolation H profile steel according to claim 1, is characterized in that: manually eliminate rust to the intersection emery cloth of the H profile steel edge of a wing and web or carry out power rust cleaning with abrasive machine before described step (1).
3. a kind of optical fiber test method of monitoring the distortion of SMW engineering method interpolation H profile steel according to claim 1, is characterized in that: to the first optical fiber bottom H profile steel and the second optical fiber smooth curved in described step (1).
4. a kind of optical fiber test method of monitoring the distortion of SMW engineering method interpolation H profile steel according to claim 1, is characterized in that: described step (5) light plate, angle steel weld the chamber being formed and close with H profile steel.
5. a kind of optical fiber test method of monitoring the distortion of SMW engineering method interpolation H profile steel according to claim 1, is characterized in that: described second optical fiber is temperature-compensated fiber.
6. a kind of optical fiber test method of monitoring the distortion of SMW engineering method interpolation H profile steel according to claim 1, is characterized in that: described first optical fiber is 9/125um single-mode fiber.
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| CN201410657200.4A CN104374331A (en) | 2014-11-18 | 2014-11-18 | Optical fiber testing method for monitoring SMW construction method inward inserted H type steel deformation |
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| CN201410657200.4A CN104374331A (en) | 2014-11-18 | 2014-11-18 | Optical fiber testing method for monitoring SMW construction method inward inserted H type steel deformation |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106320390A (en) * | 2016-07-28 | 2017-01-11 | 河海大学 | Vertical bank protection plate pile body deformation distributive monitoring method |
| CN106677231A (en) * | 2016-12-13 | 2017-05-17 | 河海大学 | Refined measurement method for pile body deformation of cast-in-place pile |
| CN108562267A (en) * | 2018-06-06 | 2018-09-21 | 水利部交通运输部国家能源局南京水利科学研究院 | The distribution type fiber-optic measuring system and method for dam body tunneling boring settlement monitoring |
| CN109024717A (en) * | 2018-08-03 | 2018-12-18 | 河南工业大学 | SMW engineering method pile-type steel method for measuring stress |
| CN110397054A (en) * | 2019-07-30 | 2019-11-01 | 毛景权 | A kind of distribution type fiber-optic cofferdam monitoring system and method with temperature compensation function |
| CN110397053A (en) * | 2019-07-30 | 2019-11-01 | 毛景权 | A kind of distribution type fiber-optic cofferdam monitoring system and method that can reject temperature influence |
| CN111424646A (en) * | 2020-03-31 | 2020-07-17 | 中铁隧道局集团有限公司 | Steel pipe pile with stressometer and manufacturing method thereof |
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| CN203465450U (en) * | 2013-07-08 | 2014-03-05 | 扬州森斯光电科技有限公司 | Strain and temperature dual-parameter optical cable |
| CN103759854A (en) * | 2014-01-13 | 2014-04-30 | 河海大学 | Device and method for distributed measurement of temperature of pile body of cast-in-situ X-shaped concrete pile |
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Patent Citations (5)
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| JP2008170182A (en) * | 2007-01-09 | 2008-07-24 | Sumitomo Electric Ind Ltd | Temperature measurement method and optical fiber sensor |
| CN101660899A (en) * | 2009-09-15 | 2010-03-03 | 中国第一冶金建设有限责任公司 | Method for detecting deformation and internal force of H-shaped steel under the ground by utilizing optical fiber |
| CN203465450U (en) * | 2013-07-08 | 2014-03-05 | 扬州森斯光电科技有限公司 | Strain and temperature dual-parameter optical cable |
| CN103438820A (en) * | 2013-09-05 | 2013-12-11 | 南京大学 | Borehole profile rock and soil mass layered deformation optical fiber measuring method |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106320390A (en) * | 2016-07-28 | 2017-01-11 | 河海大学 | Vertical bank protection plate pile body deformation distributive monitoring method |
| CN106320390B (en) * | 2016-07-28 | 2019-01-11 | 河海大学 | A kind of vertical bank revetment sheet pile pile body deformation distributed monitoring method |
| CN106677231A (en) * | 2016-12-13 | 2017-05-17 | 河海大学 | Refined measurement method for pile body deformation of cast-in-place pile |
| CN108562267A (en) * | 2018-06-06 | 2018-09-21 | 水利部交通运输部国家能源局南京水利科学研究院 | The distribution type fiber-optic measuring system and method for dam body tunneling boring settlement monitoring |
| CN109024717A (en) * | 2018-08-03 | 2018-12-18 | 河南工业大学 | SMW engineering method pile-type steel method for measuring stress |
| CN110397054A (en) * | 2019-07-30 | 2019-11-01 | 毛景权 | A kind of distribution type fiber-optic cofferdam monitoring system and method with temperature compensation function |
| CN110397053A (en) * | 2019-07-30 | 2019-11-01 | 毛景权 | A kind of distribution type fiber-optic cofferdam monitoring system and method that can reject temperature influence |
| CN110397054B (en) * | 2019-07-30 | 2021-11-30 | 中交一公局集团有限公司 | Distributed optical fiber cofferdam monitoring system and method with temperature compensation function |
| CN111424646A (en) * | 2020-03-31 | 2020-07-17 | 中铁隧道局集团有限公司 | Steel pipe pile with stressometer and manufacturing method thereof |
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Application publication date: 20150225 |
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