KR20110062674A - Apparatus and method for measuring deflection of bridge plate using fiber bragg grating sensor - Google Patents

Apparatus and method for measuring deflection of bridge plate using fiber bragg grating sensor Download PDF

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KR20110062674A
KR20110062674A KR1020090119463A KR20090119463A KR20110062674A KR 20110062674 A KR20110062674 A KR 20110062674A KR 1020090119463 A KR1020090119463 A KR 1020090119463A KR 20090119463 A KR20090119463 A KR 20090119463A KR 20110062674 A KR20110062674 A KR 20110062674A
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South Korea
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bottom plate
optical fiber
measuring
bridge
deflection
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KR1020090119463A
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Korean (ko)
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KR101105369B1 (en
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박성용
조근희
김성태
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한국건설기술연구원
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    • 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
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
    • G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

PURPOSE: A device and a method for measuring deflection of bridge plate using optical fiber strain sensor are provided to precisely measure the relative slack of the bridge plate and main post. CONSTITUTION: A device for measuring deflection of bridge plate using optical fiber strain sensor comprises a pedestal(500), a combining member(2), an optical fiber strain sensor(3), and an optical fiber(4). The pedestal is extended to the convergence direction to cross two posts. The combining member is combined on the lower part of a bottom plate(200). The optical fiber strain sensor measures the change of the light caused from the deformation of the optical fiber and measures modulus of strain. The device for measuring deflection of bridge plate detects the modulus of strain and the relative deflection of the of bridge plate.

Description

광섬유 변형률 센서를 이용한 교량 바닥판의 상대처짐량 측정장치 및 상대처짐 측정방법{Apparatus and Method for Measuring Deflection of Bridge Plate using Fiber Bragg Grating Sensor} Apparatus and Method for Measuring Deflection of Bridge Plate using Fiber Bragg Grating Sensor}

본 발명은 광섬유 변형률 센서를 이용한 교량 바닥판의 상대처짐량 측정장치 및 상대처짐 측정방법에 관한 것으로서, 구체적으로는 교축방향으로 설치되는 주형과 그 상부에 설치된 바닥판으로 이루어진 교량에서 바닥판의 상대적인 처짐량 즉, 주형에 대한 바닥판의 상대처짐량을, 광섬유 변형률 센서를 이용하여 정밀하게 측정할 수 있도록 하는 교량 바닥판의 상대처짐량 측정장치 및 상대처짐 측정방법에 관한 것이다. The present invention relates to a relative deflection measuring device and a relative deflection measuring method of the bridge bottom plate using an optical fiber strain sensor, specifically, the relative deflection amount of the bottom plate in the bridge consisting of a mold installed in the axial direction and the bottom plate installed on the top That is, the present invention relates to a relative deflection measuring device and a relative deflection measuring method of a bridge bottom plate which enables precise measurement of the relative deflection amount of the bottom plate to a mold using an optical fiber strain sensor.

도 1에는 교축 방향으로 배치되는 주형(100) 위에 바닥판(200)이 설치되어 있는 교량을 하부에서 올려다본 상태의 개략적인 사시도가 도시되어 있고, 도 2에는 도 1의 선 A-A 방향의 단면도 즉, 교축방향의 단면도로서, 종래 기술에 따라 바닥판(200)의 상대적인 처짐량을 측정하는 상태를 보여주는 단면도가 도시되어 있 다. FIG. 1 is a schematic perspective view of a bridge in which the bottom plate 200 is installed on the mold 100 arranged in the axial direction from a lower side, and FIG. 2 is a cross-sectional view in the direction AA of FIG. , As a cross-sectional view in the axial direction, is shown a cross-sectional view showing a state of measuring the relative amount of deflection of the bottom plate 200 according to the prior art.

교축 방향으로 배치되는 주형(100) 위에 바닥판(200)이 설치되어 있는 교량에서, 처짐이 발행하지 않는 고정점을 기준으로 바닥판(200)의 처짐량을 구한 절대처짐량을 측정하는 것도 중요하지만, 주형(100)에 대한 바닥판(200)의 상대적인 처짐량(상대처짐량)을 정확하게 측정하는 것도 매우 중요하다. 왜냐하면 바닥판(200)의 하중 저항 능력이나 단면 강성 등은 바닥판(200)과 주형(거더)(100)의 처짐량이 합해진 절대처짐량 보다는 바닥판(200)만의 처짐량, 즉 주형(100)에 대한 바닥판(200)의 상대처짐량에 더 깊은 관계가 있기 때문이다. In the bridge where the bottom plate 200 is installed on the mold 100 arranged in the axial direction, it is also important to measure the absolute deflection amount obtained by determining the deflection amount of the bottom plate 200 on the basis of a fixed point where deflection does not occur. It is also very important to accurately measure the relative amount of deflection (relative amount of deflection) of the bottom plate 200 with respect to the mold 100. Because the load resistance ability and the cross-sectional rigidity of the bottom plate 200 is not the absolute deflection amount combined with the deflection amount of the bottom plate 200 and the mold (girder) 100, that is, the deflection amount of the sole plate 200, that is, the mold 100 This is because the relative deflection of the bottom plate 200 has a deeper relationship.

이러한 바닥판의 상대처짐량을 측정하기 위해서, 종래에는 주형만의 절대처짐량과 바닥판의 절대처짐량을 측정하여 이의 차이를 통해 바닥판의 상대처짐량을 구하거나 도 2에 도시된 것처럼, 이웃하는 2개의 주형(100) 사이에 횡방향(교축직각 방향)으로 받침대(500)를 걸쳐지게 설치하고, 받침대(500) 위에 고정대(400)를 설치하고 바닥판(200)의 하부에는 LVDT 장치(300)를 설치하여 바닥판(200)의 상대처짐량을 LVDT 장치(300)에 의해 측정하였다. In order to measure the relative deflection of the bottom plate, conventionally, the absolute deflection amount of only the mold and the absolute deflection amount of the bottom plate are measured to obtain the relative deflection amount of the bottom plate through the difference, or as shown in FIG. Install the pedestal 500 in the transverse direction (orthogonal direction) between the molds 100, install the fixing base 400 on the pedestal 500, and place the LVDT device 300 at the bottom of the bottom plate 200. The relative deflection of the bottom plate 200 was measured by the LVDT apparatus 300.

그런데 주형(100)에 대한 바닥판(200)의 상대처짐량은 1mm 미만의 미세한 변위인 경우가 대부분이기 때문에 측정 정밀도가 매우 높은 변위계가 요구되고, 더 나아가 LVDT 장치(300)를 설치할 때 기울어짐 등이 발생하게 되면, LVDT 장치(300)의 측정값에는 바닥판(200)의 상대처짐량 이상의 큰 측정오차가 발생하게 되므로, LVDT 장치(300)에 의한 측정값의 신뢰도가 매우 낮다는 단점이 있다.  However, since the relative amount of deflection of the bottom plate 200 with respect to the mold 100 is mostly a fine displacement of less than 1 mm, a displacement meter having a very high measurement accuracy is required, and further, when the LVDT device 300 is installed, the tilting is performed. In this case, since a large measurement error is generated in the measured value of the LVDT device 300 or more than the relative deflection of the bottom plate 200, the reliability of the measured value by the LVDT device 300 is very low.

이와 같이 LVDT 장치(300)를 이용하여 교량의 바닥판(200)에 발생하는 상대 처짐량을 정밀하게, 그리고 정확하게 측정하는 데는 한계가 있으며, 따라서 이러한 한계를 극복할 수 있는 기술의 개발이 시급한 실정이다. As described above, there is a limit in accurately and accurately measuring the relative amount of deflection generated in the bottom plate 200 of the bridge using the LVDT device 300. Therefore, it is urgent to develop a technology capable of overcoming this limit. .

본 발명은 위와 같은 종래 기술의 문제점과 단점을 극복하기 위하여 개발된 것으로서, 주형과 바닥판으로 이루어진 교량에서 바닥판의 상대처짐량을 정확하고 정밀하게 측정할 수 있도록 하는 것을 목적으로 한다. The present invention was developed to overcome the problems and disadvantages of the prior art as described above, an object of the present invention to accurately and precisely measure the relative deflection of the bottom plate in the bridge consisting of the mold and the bottom plate.

본 발명에서는 위와 같은 목적을 달성하기 위하여, 교축방향으로 연장되어 있고 횡방향으로 간격을 두고 배치되는 주형과 상기 주형 위에 설치되는 바닥판으로 이루어진 교량에서 상기 바닥판의 상대처짐량을 측정하기 위한 측정장치로서, 나란한 2개의 주형 사이에 횡방향으로 가로질러 배치되는 받침대와; 각각 바닥판의 하면과 상기 받침대의 상면에 결합되며 서로 수직한 위치에 존재하게 되는 한 쌍의 결합부재와; 광섬유의 변형에 의해 유발되는 빛의 변화를 측정하여 변형률을 측정하는 변형률을 측정하는 광섬유 변형률 센서가 구비되어 있으며 긴장된 상태로 양단이 각각 상기 결합부재에 고정되어 수직하게 배치되는 광섬유를 포함하여 구성되어; 바닥판에 처짐이 발생하여 광섬유의 긴장 상태가 변함으로써 유발되는 변형을 측정하여 바닥판의 상대처짐량을 측정하게 되는 것을 특징으로 하는 교량 바닥판 상대처짐량 측정장치와, 이러한 측정장치를 이용하여 바닥판의 상대처짐량을 측정하는 방법이 제공된다. In the present invention, in order to achieve the above object, a measuring device for measuring the relative amount of deflection of the bottom plate in the bridge consisting of a mold extending in the axial direction and arranged at intervals in the transverse direction and the bottom plate installed on the mold. A pedestal disposed transversely between two molds side by side; A pair of coupling members respectively coupled to the bottom surface of the bottom plate and the top surface of the pedestal and present at positions perpendicular to each other; The optical fiber strain sensor is provided to measure the strain measured by measuring the change of light caused by the deformation of the optical fiber, and comprises an optical fiber which is arranged vertically by fixing both ends to the coupling member in a tense state. ; Bridge floor plate relative deflection measuring device, characterized in that by measuring the deformation caused by the change in the tension state of the optical fiber caused by the deflection of the floor plate and measuring the relative deflection amount of the bottom plate, and using the measuring device A method of measuring the relative amount of sag is provided.

본 발명에 의하면, 측정정밀도가 매우 높은 광섬유 변형율 센서를 바닥판의 상대처짐량 측정에 적합한 방식으로 이용할 수 있도록 측정장치를 구현함으로써, LVDT 장치를 이용한 종래의 측정기술에 비하여 더 정밀하고 정확하게 바닥판의 미소한 상대처짐량을 측정할 수 있게 되는 효과가 발휘된다. According to the present invention, by implementing the measuring device to use the optical strain sensor having a very high measurement accuracy in a manner suitable for measuring the relative deflection of the bottom plate, it is more precise and accurate than the conventional measuring technique using the LVDT device. The effect of being able to measure a minute relative deflection amount is exhibited.

이하, 첨부도면을 참조하면서 본 발명의 바람직한 실시예를 더욱 구체적으로 설명한다. 본 발명은 도면에 도시된 실시예를 참고로 설명되었으나 이는 하나의 실시예로서 설명되는 것이며 이것에 의해 본 발명의 기술적 사상과 그 핵심 구성 및 작용이 제한되지 않는다. Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings. The present invention has been described with reference to the embodiments shown in the drawings, which are described as one embodiment by which the technical spirit of the present invention and its core configuration and operation are not limited.

도 3에는 도 2에 대응되는 단면도로서, 본 발명의 일실시예에 따른 교량 바닥판 상대처짐량 측정장치(1)를 이용하여 바닥판(300)의 상대처짐량을 측정하는 상태를 보여주는 단면도가 도시되어 있다. 3 is a cross-sectional view corresponding to FIG. 2, which is a cross-sectional view showing a state of measuring a relative deflection amount of the bottom plate 300 using the bridge bottom plate relative deflection amount measuring apparatus 1 according to an embodiment of the present invention. have.

도면에 도시된 것처럼, 본 발명에 따른 교량 바닥판 상대처짐량 측정장치(1)는, 각각 교량 바닥판(200)의 하면과 양측 주형(100) 사이에 횡방향으로 가로질러 배치되는 받침대(500)에 결합되는 한 쌍의 결합부재(2)와, 변형률을 측정하는 광섬 유 변형률 센서(3)가 구비되어 있으며 긴장된 상태로 양단이 각각 상기 결합부재(2)에 고정되는 광섬유(4)를 포함하여 구성된다. As shown in the figure, the bridge bottom plate relative deflection measuring device 1 according to the present invention, respectively, the pedestal 500 which is disposed transversely between the lower surface of the bridge bottom plate 200 and both molds 100, respectively. And a pair of coupling members 2 coupled to the optical fiber strain sensor 3 for measuring strain, and each end of the optical fiber 4 fixed to the coupling member 2 in a tense state. It is composed.

구체적으로, 상기 한 쌍의 결합부재(2) 각각에는 광섬유(4)의 단부가 각각 고정되는 고정대(21)가 구비되어 있는데, 도면에 도시된 것처럼 상기 고정대(21)는 광섬유(4)가 감겨서 고정될 수 있도록 돌출된 부재로 이루어질 수 있다. Specifically, each of the pair of coupling members (2) is provided with a holder 21 is fixed to each end of the optical fiber (4), as shown in the Figure 21 is fixed to the optical fiber (4) It can be made of a protruding member so that it can be fixed.

광섬유(4)에는 광섬유 변형율 센서(3)가 구비되어 있는데, 상기 광섬유 변형율 센서(3)는, 광섬유(4)의 변형에 의해 유발되는 빛의 변화를 측정하여 변형률을 측정하는 센서이며, 이러한 광섬유 변형률 센서(3)의 일예로는, 광섬유에 격자(grating)를 형성하고 광섬유에 유발된 변형에 의해 발생하게 되는 격자에서의 굴절 변화를 측정하여 변형률을 정확하게 측정하는 공지의 격자 광섬유 변형률 센서(Fiber Bragg Grating 광섬유 센서/ "FBG 센서"라고도 부름)가 있다. The optical fiber 4 is provided with an optical fiber strain sensor 3, wherein the optical fiber strain sensor 3 is a sensor for measuring strain by measuring a change in light caused by deformation of the optical fiber 4, such an optical fiber As an example of the strain sensor 3, a known grating optical fiber strain sensor (Fiber) which accurately measures strain by forming a grating on an optical fiber and measuring a change in refraction in the grating caused by deformation induced in the optical fiber Bragg Grating Fiber Optic Sensors (also called "FBG Sensors").

위와 같은 구성을 가지는 본 발명에 따른 교량 바닥판 상대처짐량 측정장치(1)를 이용하여 교량 바닥판(200)의 상대처짐량을 측정하는 방법에 대해 설명한다. The method of measuring the relative deflection of the bridge deck 200 using the bridge bottom plate relative deflection measuring device 1 according to the present invention having the above configuration will be described.

도 3에 도시된 것처럼, 교축방향으로 길게 배치되어 있되 횡방향으로는 간격을 두고 위치하는 2개의 주형(100) 사이에 받침대(500)를 횡방향으로 가로질러 배치한다. 도면에 도시된 것처럼 주형(100)의 하부 플랜지에 받침대(500)의 양단이 놓이도록 할 수 있다. 이 때, 받침대(500)의 위치가 고정되도록 볼트 등의 부재가 주형(100)의 하부 플랜지와 받침대(500)를 동시에 관통하여 체결되도록 할 수 있다. As shown in FIG. 3, the pedestal 500 is disposed transversely between two molds 100 arranged in the axial direction but spaced apart in the transverse direction. As shown in the figure, both ends of the pedestal 500 may be placed on the lower flange of the mold 100. At this time, a member such as a bolt may be penetrated through the lower flange of the mold 100 and the pedestal 500 at the same time so that the position of the pedestal 500 is fixed.

한 쌍의 결합부재(2)를 각각 교량 바닥판(200)의 하면과, 그에 수직하게 대응되는 위치의 받침대(500) 상면에 견고하게 결합하여 고정한다. 받침대(500)가 강재로 이루어진 경우에는, 그에 결합되는 결합부재(2)를 자석 부재로 형성하여 간편하게 부착할 수 있다. 바닥판(200)의 하면에 대해서는 에폭시 등의 접착제를 이용하여 결합부재(2)를 견고하게 부착할 수 있다. The pair of coupling members 2 are firmly coupled to and fixed to the lower surface of the bridge bottom plate 200 and the upper surface of the pedestal 500 at a position corresponding to the vertical bottom thereof. In the case where the pedestal 500 is made of steel, the coupling member 2 coupled to the pedestal 500 may be formed as a magnet member and may be easily attached. The lower surface of the bottom plate 200 can be firmly attached to the coupling member 2 using an adhesive such as epoxy.

이와 같이 한 쌍의 결합부재(2)가 각각 교량 바닥판(200)의 하면과 받침대(500)의 상면에 수직한 위치에 결합된 상태에서, 광섬유 변형율 센서(3)가 구비되어 있는 광섬유(4)를 당겨서 인장방향의 프리스트레인(pre-strain)을 가한 상태로 그 양단이 상기 결합부재(2) 각각에 고정되도록 한다. 도면에 예시된 것처럼, 돌출된 부재 형태로 이루어져 결합부재(2)에 구비된 고정대(21)에 광섬유(4)의 일단을 감아서 고정한 후, 광섬유(4)의 타단을 당겨서 인장시킨 상태에서 그 단부를 다른 결합부재(2)의 고정대(21)에 감아서 고정하는 방식을 이용할 수 있다. 광섬유(4)의 양쪽 최종 단부에는, 광섬유(4)로부터의 신호를 데이터측정장치(미도시)로 전송하기 위한 커넥터(12)가 구비될 수 있다. As described above, the optical fiber 4 provided with the optical fiber strain sensor 3 in a state in which the pair of coupling members 2 are coupled at positions perpendicular to the lower surface of the bridge bottom plate 200 and the upper surface of the pedestal 500, respectively. ) And both ends of the coupling member 2 are fixed to each of the coupling members 2 while a pre-strain in the tensile direction is applied. As illustrated in the figure, it is made in the form of a protruding member, and fixed by winding one end of the optical fiber (4) to the holder 21 provided in the coupling member (2), while pulling the other end of the optical fiber (4) It is possible to use the method of winding the end of the other holding member (2) by fixing the winding 21. At both end ends of the optical fiber 4, a connector 12 for transmitting a signal from the optical fiber 4 to a data measuring device (not shown) may be provided.

이와 같은 방식으로 본 발명에 따른 교량 바닥판 상대처짐량 측정장치(1)가 교량 바닥판(200)의 하면에 설치된 상태에서, 교량 바닥판(200) 상부에 작용하는 하중이 작용하게 되면 주형(100)과 바닥판(200)에 처짐이 발생한다. 앞서 언급한 것처럼, 주형(100) 사이에서 바닥판(200)에 처짐이 발생하게 되면, 그에 따라 광섬유(4)의 긴장 상태 즉, 프리스트레인 상태가 변하게 되는데, 이러한 광섬유의 변형에 의해 유발되는 빛의 변화를 상기 광섬유 변형율 센서(3)가 측정함으로써, 바닥 판(200)의 처짐량 즉, 바닥판(200)의 상대처짐량을 정확하게 측정하게 된다. When the bridge bottom plate relative deflection measuring device 1 according to the present invention is installed on the bottom surface of the bridge bottom plate 200 in this manner, when a load acting on the bridge bottom plate 200 is applied, the mold 100 And sag occurs in the bottom plate 200. As mentioned above, when the base plate 200 is deflected between the molds 100, the tension state of the optical fiber 4, that is, the prestrain state is changed accordingly, and the light caused by the deformation of the optical fiber is changed. By measuring the change of the optical fiber strain sensor 3, the amount of deflection of the bottom plate 200, that is, the relative amount of deflection of the bottom plate 200 is accurately measured.

이와 같이, 본 발명에서는, 측정정밀도가 매우 높은 광섬유 변형율 센서(3)를 바닥판(200)의 상대처짐량 측정에 적합한 방식으로 이용할 수 있도록 측정장치를 구현함으로써, LVDT 장치(300)를 이용한 종래의 측정기술에 비하여 더 정밀하고 정확하게 바닥판(200)의 미소한 상대처짐량을 측정할 수 있게 된다. As described above, in the present invention, the measurement apparatus is implemented so that the optical fiber strain sensor 3 having a very high measurement accuracy can be used in a manner suitable for the relative deflection measurement of the bottom plate 200, thereby providing a conventional apparatus using the LVDT device 300. Compared with the measurement technology, it is possible to measure the minute relative deflection amount of the bottom plate 200 more precisely and accurately.

도 4에는 본 발명의 또다른 실시예에 대한 도 3에 대응되는 단면도가 도시되어 있다. 도 4에 도시된 실시예에 의한 교량 바닥판 상대처짐량 측정장치(1)에는 광섬유 변형율 센서(3)와 광섬유(4)의 보호를 위한 보호관(6)이 더 구비되어 있다. 즉, 수직하게 배치되는 광섬유(4)가 내부에 위치하도록, 한 쌍의 결합부재(2)에 걸쳐 보호관(6)이 설치되는 것이다. 보호관(6)의 양단에 결합부재(2)가 끼워진 상태에서, 필요에 따라서는 고정핀을 보호관(6)에 관통시켜 결합부재(2)에 고정되도록 함으로써, 보호관(6)의 단부가 결합부재(2)에 결합되도록 할 수 있다. 또한 주형(100)의 높이가 변화하여 광섬유(4)의 길이가 달라지는 경우를 대비하여 상기 보호관(6)은 그 길이의 변화가 가능하도록 주름관 형태로 제작되는 것이 바람직하다. 이와 같이 보호관(6)을 더 구비함으로써, 조류의 충돌이나 기타 예기치 못한 외력에 의해 광섬유 변형율 센서(3) 또는 광섬유(4)가 손상되는 것을 사전에 방지할 수 있게 된다. 4 is a cross-sectional view corresponding to FIG. 3 for yet another embodiment of the present invention. The bridge bottom plate relative deflection measuring apparatus 1 according to the embodiment shown in FIG. 4 is further provided with a protective tube 6 for protecting the optical fiber strain sensor 3 and the optical fiber 4. That is, the protective tube 6 is installed over the pair of coupling members 2 so that the optical fibers 4 arranged vertically are located therein. In a state where the coupling member 2 is fitted at both ends of the protective tube 6, if necessary, the end of the protective tube 6 is fixed to the coupling member 2 by penetrating the fixing pin through the protective tube 6. Can be coupled to (2). In addition, the protective tube 6 is preferably manufactured in the form of a corrugated tube so that the length of the mold 100 is changed so that the length of the optical fiber 4 is changed. By providing the protective tube 6 in this way, it is possible to prevent the optical fiber strain sensor 3 or the optical fiber 4 from being damaged by the collision of birds or other unexpected external force.

한편, 도 4에 도시된 것처럼, 광섬유(4)는 고정대(21)를 양쪽으로 감아서 한 쌍으로 설치될 수도 있다. 하나의 광섬유 변형율 센서(3)는 프리스트레인을 가한 상태로 고정하여 물리적인 변형과 온도에 반응하도록 하고, 다른 하나는 느슨하게 설치하여 온도에 대해서만 반응하도록 하여, 광섬유 변형율 센서의 온도보정에 의한 정밀도를 향상시킬 수 있도록 하는 구성도 가능하다. On the other hand, as shown in Figure 4, the optical fiber 4 may be installed in pairs by winding the fixing base 21 on both sides. One optical fiber strain sensor 3 is fixed with prestrain applied to react to physical deformation and temperature, and the other is loosely installed to react only to temperature, thereby improving accuracy by temperature correction of the optical fiber strain sensor. Configurations that can be improved are also possible.

도 1은 교축 방향으로 배치되는 주형 위에 바닥판이 설치되어 있는 교량을 하부에서 올려다본 상태의 개략적인 사시도이다. FIG. 1 is a schematic perspective view of a bridge in which a bottom plate is installed on a mold arranged in an axial direction, as viewed from below.

도 2는 도 1의 선 A-A 방향의 단면도로서, 종래 기술에 따라 바닥판의 상대적인 처짐량을 측정하는 상태를 보여주는 단면도이다. FIG. 2 is a cross-sectional view taken along the line A-A of FIG. 1 and showing a state in which the relative deflection amount of the bottom plate is measured according to the prior art.

도 3은 도 2에 대응되는 단면도로서, 본 발명의 일실시예에 따른 교량 바닥판 상대처짐량 측정장치를 이용하여 바닥판의 상대처짐량을 측정하는 상태를 보여주는 개략적인 단면도이다. 3 is a cross-sectional view corresponding to FIG. 2, which is a schematic cross-sectional view illustrating a state of measuring a relative deflection amount of a bottom plate by using a bridge bottom plate relative deflection amount measuring apparatus according to an embodiment of the present invention.

도 4는 도 3에 대응되는 단면도로서, 광섬유 변형율 센서와 광섬유의 보호를 위한 보호관(6)이 더 구비되어 있는 본 발명의 또다른 실시예에 대한 단면도이다. 4 is a cross-sectional view corresponding to FIG. 3, which is a cross-sectional view of another embodiment of the present invention, further including a fiber strain sensor and a protective tube 6 for protecting the optical fiber.

<도면의 주요 부분에 대한 부호의 설명> <Explanation of symbols for the main parts of the drawings>

2 : 결합부재2: coupling member

3 : 광섬유 센서3: fiber optic sensor

4 : 광섬유4: optical fiber

Claims (5)

교축방향으로 연장되어 있고 횡방향으로 간격을 두고 배치되는 주형(100)과 상기 주형(100) 위에 설치되는 바닥판(200)으로 이루어진 교량에서 상기 바닥판(200)의 상대처짐량을 측정하기 위한 측정장치로서, Measurement for measuring the relative deflection of the bottom plate 200 in the bridge consisting of the mold 100 extending in the axial direction and disposed at intervals in the transverse direction and the bottom plate 200 installed on the mold 100. As a device, 나란한 2개의 주형(100) 사이에 횡방향으로 가로질러 배치되는 받침대(500)와; A pedestal 500 disposed transversely between the two molds 100 side by side; 각각 바닥판(200)의 하면과 상기 받침대(500)의 상면에 결합되며 서로 수직한 위치에 존재하게 되는 한 쌍의 결합부재(2)와; A pair of coupling members 2 coupled to the bottom surface of the bottom plate 200 and the top surface of the pedestal 500 and present at a position perpendicular to each other; 광섬유(4)의 변형에 의해 유발되는 빛의 변화를 측정하여 변형률을 측정하는 광섬유 변형률 센서(3)가 구비되어 있으며 긴장된 상태로 양단이 각각 상기 결합부재(2)에 고정되어 수직하게 배치되는 광섬유(4)를 포함하여 구성되어; The optical fiber strain sensor 3 is provided to measure the strain by measuring the change of light caused by the deformation of the optical fiber 4, and both ends are fixed to the coupling member 2 in a tense state and are vertically disposed. (4) comprises; 바닥판(200)에 처짐이 발생하여 광섬유(4)의 긴장 상태가 변함으로써 유발되는 변형을 측정하여 바닥판(200)의 상대처짐량을 측정하게 되는 것을 특징으로 하는 교량 바닥판 상대처짐량 측정장치. Bridge floor plate relative deflection measuring device, characterized in that by measuring the deformation caused by the change in the tension state of the optical fiber (4) by the deflection occurs in the bottom plate 200 to measure the relative deflection amount of the bottom plate (200). 제1항에 있어서, The method of claim 1, 상기 광섬유(4)를 보호하기 위하여, 상기 광섬유(4)가 내부에 위치하도록 상기 한 쌍의 결합부재(2)에 걸쳐 보호관(6)이 더 설치되어 있는 것을 특징으로 하는 교량 바닥판 상대처짐량 측정장치. In order to protect the optical fiber 4, the bridge bottom plate relative deflection measurement, characterized in that the protective pipe 6 is further provided over the pair of coupling members 2 so that the optical fiber 4 is located inside. Device. 제2항에 있어서, The method of claim 2, 상기 보호관(6)은 길이의 신축이 가능한 주름관으로 이루어진 것을 특징으로 하는 교량 바닥판 상대처짐량 측정장치. The protective tube (6) is a bridge bottom plate relative deflection measuring device, characterized in that made of a corrugated tube of stretchable length. 제1항 내지 제3항 중 어느 한 항에 있어서, The method according to any one of claims 1 to 3, 상기 한 쌍의 결합부재(2) 각각에는 광섬유(4)의 단부가 각각 고정되는 고정대(21)가 구비되어 있는데, Each of the pair of coupling members 2 is provided with a holder 21 to which the ends of the optical fiber 4 are fixed, respectively. 상기 고정대(21)는 돌출된 부재로 이루어지고; The holder 21 is formed of a protruding member; 광섬유(4)는 상기 고정대(21)에 감겨서 고정되는 것을 특징으로 하는 교량 바닥판 상대처짐량 측정장치. Optical fiber (4) is a bridge bottom plate relative deflection measuring device, characterized in that is fixed to the winding on the fixing (21). 교축방향으로 연장되어 있고 횡방향으로 간격을 두고 배치되는 주형(100)과 상기 주형(100) 위에 설치되는 바닥판(200)으로 이루어진 교량에서 상기 바닥판(200)의 상대처짐량을 측정하는 방법으로서, As a method for measuring the relative deflection of the bottom plate 200 in a bridge consisting of a mold 100 extending in the axial direction and arranged at intervals in the transverse direction and a bottom plate 200 installed on the mold 100. , 나란한 2개의 주형(100) 사이에 횡방향으로 가로질러 받침대(500)를 설치하 고; Placing a pedestal 500 transversely between the two molds 100 side by side; 한 쌍의 결하부재(2)를 서로 수직한 위치에 존재하도록 각각 바닥판(200)의 하면과 상기 받침대(500)의 상면에 결합하여 설치하고; A pair of binding members (2) are installed to be coupled to the bottom surface of the bottom plate (200) and the top surface of the pedestal (500) so as to exist in a position perpendicular to each other; 광섬유(4)의 변형에 의해 유발되는 빛의 변화를 측정하여 변형률을 측정하는 변형률을 측정하는 광섬유 변형률 센서(3)가 구비되어 있는 광섬유(4)를 긴장시킨 상태로 그 양단을 각각 상기 결합부재(2)에 고정하여 수직하게 배치하여; The coupling member is placed at both ends thereof in a state in which the optical fiber 4 including the optical fiber strain sensor 3 which measures the strain measured by measuring the change of light caused by the deformation of the optical fiber 4 is measured. Fixed to (2) and placed vertically; 바닥판(200)에 처짐이 발생하여 광섬유(4)의 긴장 상태가 변함으로써 유발되는 변형을 측정하여 바닥판(200)의 상대처짐량을 측정하게 되는 것을 특징으로 하는 교량 바닥판 상대처짐량 측정방법. Method for measuring the relative deflection of the bridge bottom plate, characterized in that by measuring the deformation caused by the change in the tension state of the optical fiber (4) due to the deflection occurs in the bottom plate (200).
KR1020090119463A 2009-12-04 2009-12-04 Apparatus and Method for Measuring Deflection of Bridge Plate using Fiber Bragg Grating Sensor KR101105369B1 (en)

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