CN103630083A - Strain measuring device - Google Patents

Strain measuring device Download PDF

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Publication number
CN103630083A
CN103630083A CN201210310492.5A CN201210310492A CN103630083A CN 103630083 A CN103630083 A CN 103630083A CN 201210310492 A CN201210310492 A CN 201210310492A CN 103630083 A CN103630083 A CN 103630083A
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China
Prior art keywords
inner sleeve
outer sleeve
fiber
sleeve
grating sensor
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Pending
Application number
CN201210310492.5A
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Chinese (zh)
Inventor
郭余根
张�浩
徐政
罗跟东
胡锦华
崔松涛
赵书银
郭银波
姜大兵
彭宇飞
莫振泽
齐勇
盛鑫
刘志峰
郝燕钢
衡瑜
袁宽瑶
丁剑敏
刘伯成
刘旭
刘祥勇
赵洪波
孙野飞
彭俊锋
施正城
邵冠慧
鲍凤麒
吴灵
周立波
王子龙
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beijing Rail Transit Engineering Construction Co Ltd of China Railway 16th Bureau Group Co Ltd
Original Assignee
Beijing Rail Transit Engineering Construction Co Ltd of China Railway 16th Bureau Group Co Ltd
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Application filed by Beijing Rail Transit Engineering Construction Co Ltd of China Railway 16th Bureau Group Co Ltd filed Critical Beijing Rail Transit Engineering Construction Co Ltd of China Railway 16th Bureau Group Co Ltd
Priority to CN201210310492.5A priority Critical patent/CN103630083A/en
Publication of CN103630083A publication Critical patent/CN103630083A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a strain measurement device. The strain measurement device comprises an outer sleeve, an inner bushing, a fixing sheet, a connecting optical fiber, a fiber bragg grating sensor and a grating demodulator, wherein the fiber bragg grating sensor is fixed at the outer surface of the inner bushing; the inner bushing is arranged in the outer sleeve; a first end of the inner bushing is fixed with a first end of the outer sleeve through the fixing sheet; the fixing sheet is of an annular structure; and an opening is formed at a second end of the outer sleeve; the length of the inner bushing is smaller than the length of the outer sleeve; the fiber bragg grating sensor is connected with the grating demodulator through an optical fiber. With the strain measurement device of the invention adopted, stress borne by the fiber bragg grating sensor can be effectively reduced, and the sensor can be prevented from snapping. The strain measurement device can be effectively applied to long-term and real-time monitoring of prestressed ribs/cables.

Description

Strain gauge means
Technical field
The present invention relates to engineering-built field, particularly a kind of strain gauge means.
Background technology
Prestressed reinforced concrete construction is current a kind of comparatively general bridge structure, and presstressed reinforcing steel is crucial primary structure member wherein, and similarly primary structure member also has the cable wire of cable-stayed bridge, suspension bridge etc.In actual use, this type of primary structure member conventionally can be subject to the impact of numerous environmental factors and there is stress loss and stress distribution inhomogeneous.The stress distribution of presstressed reinforcing steel and variation thereof can directly affect the variation of bridge structure load-bearing capacity again, and therefore, the monitoring of the stress-strain state of presstressed reinforcing steel is one of key of whole Prestressed Concrete Bridges monitoring structural health conditions.But the stress in this type of primary structure member is generally all larger, 1860 steel strand wires that often use in bridge structure of take are example, its proof stress is 1395MPa, after considering various stress loss, at the stress of operational phase also more than 1100MPa, corresponding strain is about 6000 μ ε, and common strain transducer there will be fracture under large strain, can not complete normal surveying work.
Conventional prestress method of testing has following two classes at present: the one, and diverse location place placement sensor in the concrete along presstressed reinforcing steel, reflects that by measuring the suffered compressive stress of concrete prestress is along the distribution situation of muscle indirectly.Too much and the traditional detection system stability of this measuring point is bad.The 2nd, at presstressed reinforcing steel anchor end, proving ring is installed.This measuring method can only record end reinforced stress value.Can not effectively measure the stress of steel bar overall.
Summary of the invention
The object of the present invention is to provide a kind of strain gauge means.
According to an aspect of the present invention, provide a kind of strain gauge means, comprised outer sleeve, inner sleeve, stator, connection optical fiber, fiber-optic grating sensor and grating demodulation instrument, fiber-optic grating sensor is fixed on inner sleeve outside surface.Inner sleeve is located in outer sleeve, and the first end of inner sleeve and outer sleeve fixes by stator, and described stator is loop configuration, and described outer sleeve the second end is provided with opening.The length of inner sleeve is less than the length of outer sleeve, and fiber-optic grating sensor is connected with grating demodulation instrument by connecting optical fiber.Thus, this device is that the ring texture of outer sleeve and inner sleeve forms, and during use, deformed bar is enclosed within inner sleeve.Wherein, outer sleeve plays a protective role to inner sleeve and fiber-optic grating sensor, avoids inner sleeve and fiber-optic grating sensor etc. to be damaged.The first end of inner sleeve and one end of outer sleeve weld together by stator, and the first end of inner sleeve and deformed bar/steel strand wires bonding, the adhesive portion bit length of the first end of inner sleeve and deformed bar/steel strand wires is L 1, (length of the second end is L to inner sleeve the second end 2) do not contact with deformed bar/steel strand wires, inner sleeve can move freely along deformed bar/steel strand wires.When deformed bar/steel strand wires are stressed, can drive inner sleeve together to extend, (strain value is the L/L into △ to suppose stress that deformed bar/steel strand wires produces to cause inner sleeve first end that the distortion of △ L occurs 1), because the rigidity of connection optical fiber is minimum, internally the impact of casing deformation can be ignored, and the second end movement of inner sleeve is also △ L.Fiber-optic grating sensor is fixed on the two ends of inner sleeve, and the strain therefore recording should be L 1+ L 2length on the distortion of the △ L that produces, its strain value is △ L/L 1+ L 2so the strain that fiber-optic grating sensor records is just the L of original strain 1/ (L 1+ L 2) doubly, thereby the suffered large strain of presstressed reinforcing steel is scaled, avoid sensor to be pulled off, realize the direct measurement of fiber-optic grating sensor to large strain prestressed component, by grating demodulation instrument, read the data that fiber-optic grating sensor is passed on.And L 1and L 2can obtain different minifications according to the adjusting that needs of engineering reality, the present invention can effectively be applied to the long-term Real-Time Monitoring of presstressed reinforcing steel/rope.
In some embodiments, between outer sleeve and inner sleeve, be provided with the gap of 5mm, the long 5cm of length of the Length Ratio inner sleeve of described outer sleeve.Thus, can make inner sleeve easily be located in outer sleeve, and inner sleeve can not rub with the inwall of outer sleeve while moving.The long 5cm of length of the Length Ratio inner sleeve of outer sleeve, for certain space has been reserved in the movement of inner sleeve, while avoiding inner sleeve to be moved and outer sleeve collision, affects the accuracy of measurement data.
In some embodiments, gap-fill lubricating oil.Thus, can effectively reduce the frictional resistance of inner sleeve and outer sleeve.
In some embodiments, the other end of outer sleeve is provided with aperture, and hole diameter is 5mm.Thus, the convenient installation that connects optical fiber.
In some embodiments, the pipe thickness of outer sleeve and inner sleeve is 3mm.
In some embodiments, strain gauge means also comprises plastic casing.The two ends of fiber-optic grating sensor are fixedly connected with the two ends of inner sleeve, and the remainder of fiber-optic grating sensor is located in plastic casing.Plastic casing is fixed on inner sleeve outside surface.Thus, when inner sleeve generation strain, fiber-optic grating sensor can be along with inner sleeve generation strain, and plastic casing can protect fiber-optic grating sensor, can effectively avoid its damage.
In some embodiments, the thickness sum that the external diameter of plastic casing and epoxy curing agent cover is less than the height in gap, and thus, plastic casing and protective seam can not rub with outer sleeve, strengthens the accuracy of measuring.
In some embodiments, the two ends of plastic casing and fiber-optic grating sensor are all fixing by epoxy curing agent and inner sleeve surface bonding.Epoxy curing agent plastic covering sleeve pipe forms protective seam.Thus, plastic casing can be protected fiber-optic grating sensor, can effectively avoid its damage.
In some embodiments, the internal diameter of stator equals the internal diameter of inner sleeve, and the external diameter of stator equals the external diameter of outer sleeve, and the thickness of stator is 2mm.Thus, make inner sleeve be connected closelyr with outer sleeve, increase the accuracy of measurement device.
Accompanying drawing explanation
Fig. 1 is the structural representation of the strain gauge means of one embodiment of the present invention.
Fig. 2 is the structural scheme of mechanism of the outer tube of strain gauge means in Fig. 1.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further detailed explanation.
Fig. 1 and Fig. 2 have schematically shown the strain gauge means according to one embodiment of the present invention.
This strain gauge means comprises the DS/BGK-FBG-8125 type grating demodulation instrument 7 that outer sleeve 1, inner sleeve 2, stator 3, connection optical fiber 4, Shenzhen FBGS611N1 type fiber-optic grating sensor 5 that too time communication company limited provides, the prosperous Rong He of plastic casing 6 and Beijing Science and Technology Ltd. provide.
Wherein outer sleeve 1 adopts steel cylinder, thickness is 3mm, its internal diameter is than the large 5mm of the external diameter of inner sleeve, when assembling, between outer sleeve 1 and inner sleeve 2, there is the gap 102 of 5mm, inner sleeve 2 can be located in outer sleeve 1 like a cork, and gap 102 is filled with lubricating oil, when inner sleeve 2 strains occur moves, reduce the friction force between itself and outer sleeve 1, improve the accuracy of measurement data.
Inner sleeve 2 adopts copper pipe, and thickness is 3mm, and the equal and opposite in direction of its internal diameter and deformed bar/steel strand wires so can be inserted in deformed bar/steel strand wires by inner sleeve 2 and measure.The large 5cm of length of the Length Ratio inner sleeve 2 of outer sleeve 1, while extending for inner sleeve generation strain, reserved mobile space, can avoid the collision between inner sleeve 2 and outer sleeve 1, affects the accuracy of measurement data.
Stator 3 is annular steel disc, and its thickness is 2mm, and the internal diameter of stator 3 equals the internal diameter of inner sleeve 2, and external diameter equals the external diameter of outer sleeve 1.Inner sleeve 2 is located in outer sleeve 1, and inner sleeve 2 is welded and fixed by stator 3 with first end outer sleeve 1, make inner sleeve 2 with outer sleeve 1 better tightness fixedly time, increase the accuracy of measurement.The second end of outer sleeve 1 is provided with opening 102, and the diameter that is provided with 101，Gai hole, hole 101 on the tube wall above opening 102 is 5mm, can conveniently connect the installation of optical fiber.
The two ends of inner sleeve 2 are provided by the 810 type epoxy curing agents that provided by Changsha chemical institute respectively at the two ends of fiber-optic grating sensor 5; fiber-optic grating sensor 5 remainders are all located in plastic casing 6; plastic casing 6 is fixing by epoxy curing agent and inner sleeve 2 outside surface bondings; epoxy curing agent plastic covering sleeve pipe 6 also forms protective seam 8; plastic casing 6 can make fiber-optic grating sensor 5 steady operations, and epoxy curing agent is better in 8 pairs of fiber-optic grating sensor 5 protectiveness of the outer formation protective seam of plastic casing 6.The two ends of fiber-optic grating sensor 5 are fixed on the two ends of inner sleeve 2, and when strain occurs inner sleeve 2, fiber-optic grating sensor 5 can strain occur along with inner sleeve 2.Fiber-optic grating sensor 5 is connected with grating demodulation instrument 7 by connecting optical fiber 4, connects optical fiber 4 through after aperture 101, by epoxy resins hardening agent, hole 101 is sealed.In addition in plastic casing 6 and fiber-optic grating sensor 5 gap 102 between inner sleeve 2 and outer sleeve 1, the thickness that the external diameter of plastic casing 6 and epoxy curing agent cover is less than the height in gap 102, when measuring, can not rub with outer sleeve 1, strengthen the accuracy of measuring.
The present invention is that the ring texture of outer sleeve 1 and inner sleeve 2 forms, and during use, deformed bar is enclosed within inner sleeve 2.The first end 201 of inner sleeve 2 welds together by stator 3 with one end of outer sleeve 1, and the first end 201 of inner sleeve 2 is bonding with deformed bar/steel strand wires, and the first end 201 of inner sleeve is L with the adhesive portion bit length of deformed bar/steel strand wires 1, the length of inner sleeve second end 202(the second end 202 is L 2) do not contact with deformed bar/steel strand wires, inner sleeve 2 can move freely along deformed bar/steel strand wires.When deformed bar/steel strand wires are stressed, can drive inner sleeve 2 together to extend, (strain value is the L/L into △ to suppose stress that deformed bar/steel strand wires produces to cause inner sleeve first end 201 that the distortion of △ L occurs 1), because the rigidity of connection optical fiber 4 is minimum, on the impact of inner sleeve 2 distortion, can ignore, the second end 202 displacements of inner sleeve 2 are also △ L.Fiber-optic grating sensor 5 is fixed on the two ends of inner sleeve 2, and the strain therefore recording should be L 1+ L 2length on the distortion of the △ L that produces, its strain value is △ L/L 1+ L 2so the strain that fiber-optic grating sensor 5 records is just the L of original strain 1/ (L 1+ L 2) doubly, thereby the suffered large strain of presstressed reinforcing steel is scaled, avoid sensor to be pulled off, realize the direct measurement of 5 pairs of large strain prestressed components of fiber-optic grating sensor, by grating demodulation instrument 7, read the data that fiber-optic grating sensor 5 is passed on.And L 1and L 2can obtain different minifications according to the adjusting that needs of engineering reality, the present invention can effectively be applied to the long-term Real-Time Monitoring of presstressed reinforcing steel/rope.
Above-described is only the preferred embodiment of the present invention, it should be pointed out that without departing from the concept of the premise of the invention, also can have other distortion and improvement.

Claims (9)

1. strain gauge means, comprise outer sleeve, inner sleeve, stator, connection optical fiber, fiber-optic grating sensor and grating demodulation instrument, described fiber-optic grating sensor is fixed on inner sleeve outside surface, described inner sleeve is located in outer sleeve, and the first end of inner sleeve and outer sleeve is fixed by stator, described stator is loop configuration, described outer sleeve the second end is provided with opening, the length of described inner sleeve is less than the length of outer sleeve, and described fiber-optic grating sensor is connected with grating demodulation instrument by connecting optical fiber.
2. strain gauge means according to claim 1, wherein, is provided with the gap of 5mm between described outer sleeve and inner sleeve, the long 5cm of length of the Length Ratio inner sleeve of described outer sleeve.
3. strain gauge means according to claim 2, wherein, described gap-fill lubricating oil.
4. strain gauge means according to claim 3, wherein, the second end of described outer sleeve is provided with hole, and described bore dia is 5mm.
5. strain gauge means according to claim 4, wherein, the pipe thickness of described outer sleeve and inner sleeve is 3mm.
6. strain gauge means according to claim 1, wherein, the internal diameter of described stator equals the internal diameter of inner sleeve, and the external diameter of described stator equals the external diameter of outer sleeve, and the thickness of described stator is 2mm
7. according to the strain gauge means described in claim 1 to 6 any one, wherein, also comprise plastic casing, the two ends of described fiber-optic grating sensor are fixedly connected with the two ends of inner sleeve, the remainder of described fiber-optic grating sensor is located in plastic casing, and described plastic casing is fixed on inner sleeve outside surface.
8. strain gauge means according to claim 7, wherein, the two ends of described plastic casing and fiber-optic grating sensor are all fixing by epoxy curing agent and inner sleeve surface bonding, and described epoxy curing agent plastic covering sleeve pipe forms protective seam.
9. strain gauge means according to claim 8, wherein, the thickness sum that the external diameter of described plastic casing and epoxy curing agent cover is less than the height in gap.
CN201210310492.5A 2012-08-28 2012-08-28 Strain measuring device Pending CN103630083A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104897321A (en) * 2015-06-24 2015-09-09 潍坊学院 Prefabricated opening concrete tubular pile body inner wall shearing strength testing device and method
CN105043281A (en) * 2015-05-12 2015-11-11 东北电力大学 Fiber grating strain sensor and manufacturing method and forming die thereof
CN109958874A (en) * 2019-03-25 2019-07-02 汤始建华建材（南通）有限公司 A kind of steel pipe sleeve and the method for measuring its intensity and presstressed reinforcing steel intensity simultaneously

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004077362A (en) * 2002-08-21 2004-03-11 Ntt Advanced Technology Corp Axial force meter
CN1570549A (en) * 2003-07-18 2005-01-26 苏州科技学院 Peak wavelength tuning unit for fiber grating
CN101266179A (en) * 2008-03-10 2008-09-17 大连理工大学 Inner arced ceiling thin wall straining cartridge throw-in type optical fibre Bragg grating pressure sensor
CN101738170A (en) * 2009-12-18 2010-06-16 北京科技大学 Distributed fiber sensor for large deformation measurement
CN201535667U (en) * 2009-09-18 2010-07-28 昆明理工大学 Double tube fiber Bragg grating strain sensor insensitive to temperature change
CN201567531U (en) * 2009-09-30 2010-09-01 法尔胜集团公司 Smart cable device for bridges with optical fiber grating sensor inside

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004077362A (en) * 2002-08-21 2004-03-11 Ntt Advanced Technology Corp Axial force meter
CN1570549A (en) * 2003-07-18 2005-01-26 苏州科技学院 Peak wavelength tuning unit for fiber grating
CN101266179A (en) * 2008-03-10 2008-09-17 大连理工大学 Inner arced ceiling thin wall straining cartridge throw-in type optical fibre Bragg grating pressure sensor
CN201535667U (en) * 2009-09-18 2010-07-28 昆明理工大学 Double tube fiber Bragg grating strain sensor insensitive to temperature change
CN201567531U (en) * 2009-09-30 2010-09-01 法尔胜集团公司 Smart cable device for bridges with optical fiber grating sensor inside
CN101738170A (en) * 2009-12-18 2010-06-16 北京科技大学 Distributed fiber sensor for large deformation measurement

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105043281A (en) * 2015-05-12 2015-11-11 东北电力大学 Fiber grating strain sensor and manufacturing method and forming die thereof
CN105043281B (en) * 2015-05-12 2017-09-05 东北电力大学 A kind of fiber Bragg grating strain sensor and preparation method thereof and mould
CN104897321A (en) * 2015-06-24 2015-09-09 潍坊学院 Prefabricated opening concrete tubular pile body inner wall shearing strength testing device and method
CN104897321B (en) * 2015-06-24 2016-08-24 潍坊学院 Wall shearing stress method of testing in a kind of pre-formed members concrete tubular pile pile body
CN109958874A (en) * 2019-03-25 2019-07-02 汤始建华建材（南通）有限公司 A kind of steel pipe sleeve and the method for measuring its intensity and presstressed reinforcing steel intensity simultaneously

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Application publication date: 20140312