CN104048616A - Distributed optical fiber used for detecting concrete strain - Google Patents
Distributed optical fiber used for detecting concrete strain Download PDFInfo
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- CN104048616A CN104048616A CN201410310559.4A CN201410310559A CN104048616A CN 104048616 A CN104048616 A CN 104048616A CN 201410310559 A CN201410310559 A CN 201410310559A CN 104048616 A CN104048616 A CN 104048616A
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Abstract
The invention discloses distributed optical fiber used for detecting concrete strain. The distributed optical fiber comprises bare fiber. The bare fiber is sequentially sleeved with a plastic protective casing and a rubber protection jacket. The rubber protection jacket is further coated with an epoxy coating layer and is provided with grooves or irregular protrusions. According to the distributed optical fiber, epoxy mortar is coated on the outer surface of an optical fiber protective sleeve, and a coating with the rough surface is formed after the epoxy mortar is hardened and thus synchronous deformation of concrete and the optical fiber is facilitated.
Description
Technical field
The present invention relates to distribution type fiber-optic, relate in particular to a kind of distribution type fiber-optic for detection of concrete strain.
Background technology
Concrete is one of architecture engineering material of being most widely used of current China.Along with domestic infrastructure construction obtains the progress of advancing by leaps and bounds, mass concrete is more and more extensive: the concrete of basement floor of the concrete dam of various types, port structure, skyscraper and a lot of large-scale foundation platforms etc. all adopts mass concrete cast-in-site to form.
As everyone knows, the standard of most of concrete workses is controlled by crack.According to estimates, the crack in reinforced concrete structure is 20% left and right that only accounts for crack sum being caused by external load, and by 80% left and right that is deformed into the main crack causing and accounts for greatly crack sum.Therefore the crack progressing situation that obtains inside concrete is promptly and accurately conducive to carry out concrete maintenance work, improves the security of member.
In 20 century 70 later stages, along with the appearance of optical time domain reflection (OTDR) technology, the research of distributed sensing technology and application have obtained unprecedented development.Wherein a kind of sophisticated technology that developed recently is come based on BOTDA technology, compared with traditional monitoring method, there is the features such as the high and permanance field of distributed, real-time, distance, precision, and this technology has the various parameters such as strain (stress), temperature, dynamic response, corrosion condition, crack situation and the traffic conditions of collection structure, makes people carry out comprehensive analysis to the safety of structure enough confidence is provided.Therefore, change in the world technology and started to be widely used in the safety monitoring of foundation works equipment.
Optical fiber is a kind of slender glass silk of being fractureed of being easy to, and naked fibre is being easy to for detection of distress in concrete because the problems such as construction fracture; Ganoid optical fiber and the concrete cementing properties of common matcoveredn are poor, and in the time that concrete deformation is larger, internal optical fiber and concrete can not be out of shape simultaneously.So develop and a kind ofly can just seem very necessary for surveying the special optic fibre of concrete strain.
Summary of the invention
The technical problem to be solved in the present invention easily fractures while being for optical fiber in prior art for detection of distress in concrete or is poor with concrete cementing properties, in the time that concrete deformation is larger, the defect that internal optical fiber and concrete can not be out of shape simultaneously, not frangibility of one is provided, and can with the distribution type fiber-optic that is exclusively used in monitoring inside concrete ess-strain of concrete concurrent deformation.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of distribution type fiber-optic for detection of concrete strain is provided; this distribution type fiber-optic comprises naked fibre; sheathed plastic protective sleeve pipe and rubber are protected overcoat to this naked fibre successively outward; also smear one deck epoxy coated layer outward at this rubber protection overcoat, wherein outer the putting of rubber protection is provided with groove or irregular thrust.
In distribution type fiber-optic of the present invention, between plastic protective sleeve pipe and rubber protection overcoat, be also provided with rigid fiber protection bundle.
In distribution type fiber-optic of the present invention, this distribution type fiber-optic is bundled on the main muscle of xoncrete structure, and one end draws from xoncrete structure, is connected with optical cable.
The beneficial effect that the present invention produces is: sheathed plastic protective sleeve pipe and rubber are protected overcoat to the naked fibre of the present invention successively outward; also smear one deck epoxy coated layer outward at this rubber protection overcoat; protect the surface of overcoat to make groove type rubber or there is irregular thrust on surface; epoxy resin mortar spreads upon fiber boot outside; after sclerosis, form shaggy coat, be conducive to the deform in same pace of concrete and optical fiber.
Further, adopt rigid glass fibre reinforcement protection, can resist tension and compression and impact failure in work progress.
Brief description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 a, 1b are the structural representation of the embodiment of the present invention for detection of the distribution type fiber-optic of concrete strain;
Fig. 2 is the rubber protection jacket structure schematic diagram of embodiment of the present invention fluted body;
Fig. 3 is the rubber protection jacket structure schematic diagram of embodiment of the present invention surface imperfection.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
As shown in Fig. 1 a, 1b; the embodiment of the present invention is for detection of the distribution type fiber-optic of concrete strain; comprise naked fine 1; sheathed plastic protective sleeve pipe 2 and rubber are protected overcoat 3 to this naked fibre successively outward; also smear one deck epoxy coated layer 4 outward at this rubber protection overcoat, wherein rubber protection overcoat 3 is provided with groove or irregular thrust.Protect the surface of overcoat 3 to make groove type rubber or there is irregular thrust shape on surface; outside it, smear again again epoxy resin mortar (epoxy resin mortar stirs sand and forms using epoxy resin as jointing compound); epoxy resin mortar spreads upon fiber boot outside; after sclerosis, form shaggy coat, be conducive to the deform in same pace of concrete and optical fiber.
In a preferred embodiment of the present invention, between plastic protective sleeve pipe 2 and rubber protection overcoat 3, be also provided with rigid fiber protection bundle 4, adopt the reinforcement protection of rigid glass fibre protection bundle, can resist tension and compression and impact failure in work progress.
In one embodiment of the present of invention, this distribution type fiber-optic is bundled on the main muscle of xoncrete structure, and one end draws from xoncrete structure, is connected with optical cable.
In concrete application, will require to determine strain sensing optical fiber laying mode according to concrete concrete structure pouring scheme and monitoring; On the main muscle of xoncrete structure, bind strain sensing optical fiber (being the distribution type fiber-optic in the embodiment of the present invention) according to definite laying mode; Again strain sensing optical fiber is drawn from xoncrete structure.
By optical cable one end and strain sensing fused fiber splice, in the monitor of other end access monitoring chamber; Open monitor, detected concrete structural strain is monitored, data analysis and processing, obtain the strain field of xoncrete structure interior three-dimensional.
The inner generation of xoncrete structure deformation, drives distribution type fiber-optic wherein to deform.Utilize detector the distortion situation of optical fiber can be detected.Because optical fiber is consistent with optical fiber region concrete deformation, so can be according to the inner concrete strain regime of the deformation state reaction structure of optical fiber.
Should be understood that, for those of ordinary skills, can be improved according to the above description or convert, and all these improvement and conversion all should belong to the protection domain of claims of the present invention.
Claims (3)
1. the distribution type fiber-optic for detection of concrete strain; it is characterized in that; this distribution type fiber-optic comprises naked fibre; sheathed plastic protective sleeve pipe and rubber are protected overcoat to this naked fibre successively outward; also smear one deck epoxy coated layer outward at this rubber protection overcoat, wherein outer the putting of rubber protection is provided with groove or irregular thrust.
2. distribution type fiber-optic according to claim 1, is characterized in that, is also provided with rigid fiber protection bundle between plastic protective sleeve pipe and rubber protection overcoat.
3. distribution type fiber-optic according to claim 1, is characterized in that, this distribution type fiber-optic is bundled on the main muscle of xoncrete structure, and one end draws from xoncrete structure, is connected with optical cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410310559.4A CN104048616A (en) | 2014-06-30 | 2014-06-30 | Distributed optical fiber used for detecting concrete strain |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410310559.4A CN104048616A (en) | 2014-06-30 | 2014-06-30 | Distributed optical fiber used for detecting concrete strain |
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| CN104048616A true CN104048616A (en) | 2014-09-17 |
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| CN201410310559.4A Pending CN104048616A (en) | 2014-06-30 | 2014-06-30 | Distributed optical fiber used for detecting concrete strain |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104501734A (en) * | 2014-12-24 | 2015-04-08 | 南京大学 | Interfacial compatibility type distributed optical fiber strain sensor for rock-soil media |
| CN108709856A (en) * | 2018-07-19 | 2018-10-26 | 江苏省水利勘测设计研究院有限公司 | A kind of concrete structure crack monitoring and warning system and method for early warning |
| CN112525073A (en) * | 2020-11-19 | 2021-03-19 | 哈尔滨工业大学 | Concrete crack position and width identification method based on Brillouin gain spectrum |
| CN115014221A (en) * | 2022-05-05 | 2022-09-06 | 武汉理工大学 | Fiber grating sensor microstructure and process suitable for mounting and fixing heterogeneous surface |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104501734A (en) * | 2014-12-24 | 2015-04-08 | 南京大学 | Interfacial compatibility type distributed optical fiber strain sensor for rock-soil media |
| CN108709856A (en) * | 2018-07-19 | 2018-10-26 | 江苏省水利勘测设计研究院有限公司 | A kind of concrete structure crack monitoring and warning system and method for early warning |
| CN108709856B (en) * | 2018-07-19 | 2021-02-05 | 江苏省水利勘测设计研究院有限公司 | Concrete structure crack monitoring and early warning system and early warning method |
| CN112525073A (en) * | 2020-11-19 | 2021-03-19 | 哈尔滨工业大学 | Concrete crack position and width identification method based on Brillouin gain spectrum |
| CN112525073B (en) * | 2020-11-19 | 2022-06-03 | 哈尔滨工业大学 | Structural crack identification method based on Brillouin gain spectrum characteristic parameters |
| CN115014221A (en) * | 2022-05-05 | 2022-09-06 | 武汉理工大学 | Fiber grating sensor microstructure and process suitable for mounting and fixing heterogeneous surface |
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Application publication date: 20140917 |
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