KR20080035145A - Diagnosis method for expandable reinforcing member using optical fiber cable sensor - Google Patents

Abstract

An expandable reinforcing member having an optical fiber cable sensor is provided to efficiently maintain quality thereof by forming an optical fiber adhesive sheet in one body therewith. An expandable reinforcing member(200) having an optical fiber cable sensor(100) includes the optical fiber cable sensor. The optical fiber cable sensor consists of an optical fiber and an adhesive sheet. The optical fiber is adhered on the adhesive sheet in one body. The adhesive sheet including the optical fiber is adhered on the expandable reinforcing member with an adhesive including resin. The optical fiber sensor detects variation of luminous intensity caused by deformation of the expandable reinforcing member. A measurement unit measures change of strength of the expandable reinforcing member and allows a worker to check the change of strength of the expandable reinforcing member.

Description

DIAGNOSIS METHOD FOR EXPANDABLE REINFORCING MEMBER USING OPTICAL FIBER CABLE SENSOR}

Figure 1a shows a working state diagram of a conventional optical fiber,

Figure 1b shows the type according to the measurement range of the conventional optical fiber,

Figure 1c shows the principle of a conventional optical fiber sensor,

Figure 1d shows an example of a measuring means using a conventional optical fiber sensor.

2 is a conceptual view illustrating the operation of the optical fiber sensor of the present invention.

Figure 3 shows the attachment sheet to which the optical fiber of the present invention is attached.

4A, 4B and 4C illustrate an example of a method for installing an attachment sheet with an optical fiber of the present invention.

Figure 5 shows another example of the attachment sheet installation method with an optical fiber of the present invention of the attachment sheet installation method of the present invention.

Figure 6 schematically shows another installation example of the optical fiber sensor of the present invention.

<Description of the symbols for the main parts of the drawings>

100: optical fiber sensor 110: optical fiber

120: measuring means 200: elastic structural member

300: mounting sheet mounting device 310: housing

320: inner support portion 330: adhesive means supply portion

340: adhesive means 350: adhesive means accommodating part

360: attachment sheet supply means 370: support

380: moving roller portion 400: rolling device

The present invention relates to a method for diagnosing performance of a flexible structural member using an optical fiber sensor. More specifically, elasticity including reinforcing bars and PC strands, etc., which can always measure the tension of a flexible structural member whose reliability is enhanced to the measured measured values (measured by measuring means) without requiring additional protection. The present invention relates to a method for diagnosing performance of a structural member.

As a sensor used in a conventional measurement system, an optical fiber sensor is widely used. The optical fiber constituting the optical fiber sensor (optical fiber and measuring means) is a core (Fiber Core, 10), cladding (20) and the core and cladding having different refractive index so that the incident light is totally reflected as shown in Figure 1a It is customary to consist of a polymer coating 30 and a jacket 40 for protection.

The optical fiber sensor using the optical fiber may be classified into a single point, an arc, and a multiple type method as shown in FIG. 1B according to the measurement range.

That is, the one-point type optical fiber sensor 50 is simple to measure the amount of change of strain, temperature, and pressure of the site where the optical fiber sensor is mounted, but it is necessary to mount the optical fiber sensor to multiple sites when a plurality of sites are targeted. There may be some restrictions on the use.

Optical Time Domain Reflectometry (ODTR) is representative of the distributed optical fiber sensor 60. This has the advantage that it is useful to measure the overall behavior of the structure using a single optical fiber.

The multiple type optical fiber sensor 70 is a type in which two or more single-point optical fiber sensors are installed in one optical fiber sensor, and an FBG sensor (Fiber Bragg Gratting Sensor, Bragg grating optical fiber sensor) corresponds thereto.

At this time, the ODTR has the advantage of being easy to manufacture, robust, and simple in signal processing because the ODTR directly detects the amount of lost light detected through the optical fiber, and has a light source, an optical fiber, and a photodetector. It is generally composed of.

Looking at the measurement principle of the ODTR, when the pulsed light is incident into the optical fiber as shown in Figure 1c, when the tension or bending occurs in the optical fiber due to external stimulation, the amount of light loss increases according to the degree, the optical fiber due to cracks, etc. When is cut off, reflected light appears on the cut surface. That is, when the incident pulsed light is back scattered and returned, the loss amount of the pulsed light is measured to observe the change (strain, pressure, etc.) of the external physical quantity.

In order to obtain the strain from the optical loss, data indicating the correlation between the strain derived by the optical cable installation condition of the actual structure and the increase of the optical loss is obtained in advance, and the strain is detected through the data. The standard DAQ (Data Acquisition) System can be used, and various configurations are possible according to the system designer. (The configuration of a typical DAQ (Data Acquisition) System is a signal conditioning device connected to a sensor. Is a kind of isolation amplification system), analytical hardware, and a computer with software.)

As described above, a number of conventional methods for measuring various physical quantities using ODTR and conventional measuring means have been introduced.

That is, in connection with the present invention, the ODTR measuring system 80 and the method for detecting the occurrence location of landslides have been disclosed in Korea. (Patent 10-2005-74053)

1D, the coupling means 83 for coupling the pulse generating means 81, the laser diode 82, the output pulsed light to the optical fiber, and outputs the pulsed light scattered backward, the coupling means The optical detector 84 for measuring the optical power of the pulsed light and converting it into an electrical signal, an amplifier 85 for amplifying the electrical signal, and an AD for converting the amplified electrical signal into a digital signal at a constant sampling rate. Converter 86 stores the data generated by storing and analyzing such digital signals on a display, and outputs a control signal for adjusting pulse width and pulse period and a setting signal for adjusting sampling rate according to the analysis data. A measurement system consisting of a processing unit 87 and a display unit 88 is used, but the optical fiber 89 is installed in a place where landslides may occur while protecting with a protective tube. It can be seen that it is possible to predict the occurrence of landslides.

In addition, as a method for measuring the loss amount of the tension force (prestress) introduced in the PSC concrete structure in connection with the present invention, the conventional vibration method, the exposure test method, etc. are introduced.

It is pointed out that the method by the vibration method is suitable for indoor experiments, and there are many problems that need to be set up, such as noise, to be applied to a structure in common.

The exposure test method has been pointed out that the problem of having to crush a part of the concrete in that the tension force should be measured by exposing the PC strands.

In addition, these methods have been very uncertain in terms of reliability because the sensors or the like are installed on the surface of the concrete structure, and the introduced or lost tension is measured. Therefore, due to such uncertainty, It was pointed out that when retensioning, fatal load imbalance can occur in the structure.

In addition, a method of forming a groove in the surface of the rebar, etc. installed in the concrete structure, and the optical fiber sensor is embedded in the groove, but this method may be somewhat complicated in the manufacturing method, in particular, forming the groove in the rebar There was a problem that could affect the structural performance of the rebar itself.

The present invention is to solve the problems of the prior art, an object of the present invention is to fabricate by using a simple attachment device, but before the tension of the tension material is fabricated directly integrated into the surface of the flexible structural member including the tension material. It is to provide a method for diagnosing the performance of a flexible structural member using an optical fiber sensor that can increase efficiency and make it possible to measure the change in tension immediately after the tension is introduced, regardless of the tension method (post tension or pretension). .

In order to achieve the above technical problem, the performance diagnostic method of the flexible structural member using the optical fiber sensor of the present invention

First, the sensor is mounted on a flexible structural member 200, such as a concrete reinforcement including a reinforcing steel reinforcement embedded in the concrete or PC strand, a tension member including a FRP member, and the measured value and the stress or prestress of the flexible structural member In measuring the amount of change in stress or prestress by the relationship with the amount of change in

As the sensor, the optical fiber sensor 100 directly integrated on the surface of the stretchable structural member is used before the tension force is introduced to cope with the change in length of the stretchable structural member.

That is, before the elastic structural members such as reinforcing bars or PC strands (including tendons, tension members, tension members, PC strands, etc.) are embedded by concrete, the optical fiber sensor is first attached to the attachment sheet, and then resins are included. It can be integrated with the stretchable structural member as an adhesive means.

For example, the amount of change in the amount of light of the optical fiber sensor installed by integrating an adhesive sheet 130 in which the optical fiber sensor is pre-attached to the reinforcing bar itself by using an adhesive such as resin so as to directly act on the prestress change due to the tension or compression of the rebar Guideline and more reliable measurement values regardless of the method of introducing tension (post tension and pretension).

The attachment sheet 130 is formed in the form of a roll (Roll) to facilitate its handling, and can be easily attached to the stretchable structural member 200 by the attachment sheet installation device 300 and the attachment sheet supply means 360. To make it possible.

As a result, it is possible to monitor the measurement values related to the change according to the prestress introduction of the PSC concrete member, and the monitored measurement values can be utilized for analysis by conventional measuring means so that the maintenance of the PSC concrete member is very easy. You can do it.

In the method of monitoring the measured value thus detected, the measured value by the optical fiber sensor is set to the amount of light change according to the deformation of the optical fiber sensor so that the amount of light change is detected by a measuring means including a monitoring device including a light detector and a display. It could be.

The measured values sensed by the optical fiber sensor can be measured and analyzed in various ways, which may use conventional measurement systems and analysis programs, depending on the system design.

Therefore, the present invention does not limit such specific measuring means itself, but since the optical fiber sensor is previously integrated with the flexible structural member, it is intended to present a minimum technical configuration for monitoring the measured value by the optical fiber sensor. The measured value by is set to the amount of change in the amount of light in accordance with the change in the length of the optical fiber sensor is enabled by the measuring means including a light detector and a display.

BRIEF DESCRIPTION OF DRAWINGS To describe the present invention more clearly and easily, the following describes the best embodiments of the present invention in detail with reference to the accompanying drawings, and embodiments according to the present invention may be modified in various other forms, and thus the scope of the present invention. Is not limited to the embodiment described below.

2 is a schematic view showing the operation of the optical fiber sensor 100: 110,120 of the present invention.

3 is a perspective view illustrating a state in which the attachment sheet 130 to which the optical fiber 110 of the present invention is attached, and the protective sheet 140 are attached to the flexible structural member 200 which is reinforced.

Figures 4a, 4b and 4c is a perspective view, a side view and a front view showing an example of the attachment sheet installation method (fixed attachment sheet installation device) in which the optical fiber is formed of the present invention.

5 is a perspective view showing another example (movable attachment sheet installation apparatus) of the attachment sheet installation method in which the optical fiber is formed of the present invention.

Fig. 6 schematically shows another example of installation of the optical fiber of the present invention.

First, the present invention uses an optical fiber sensor as a sensor.

The optical fiber sensor 100 will be described based on an example using an optical time domain reflectometry (ODTR) or an FBG sensor (Fibre Bragg Gratting Sensor).

The optical fiber sensor 100, for example, the coupling means for coupling the pulse generating means 121, the laser diode 122, the output pulsed light to the optical fiber, and outputs the pulsed light scattered backward as in the conventional measurement system ( 123), an optical detector 84 for measuring the optical power of the pulsed light from the coupling means and converting it into an electrical signal, an amplifier 125 for amplifying the electrical signal, and converting the amplified electrical signal to a constant sampling rate. AD converter 126 for converting into digital signals by storing and analyzing these digital signals and outputting the data generated on the display, and adjusting the control signal and sampling rate for adjusting the pulse width and pulse period according to the analysis data. The measurement means 120 composed of a signal processing unit 127 and a display unit 128 for outputting a setting signal for the purpose of using the optical fiber 110.

2, the optical fiber 110 itself is installed to be integrated with the stretchable structural member 200.

In this case, the stretchable structural member 200 refers to a tension member including reinforcing bars or PC strands, which are pre-buried / placed in a concrete structure, and are stretched or shrunk by their physical properties according to the introduction of a working load or tension force.

That is, in the case of reinforcing bars, the reinforcing bars are tensioned by the working load, and the reinforcing bars are changed in length due to the tension. When the working load is removed within the elastic range, the reinforcing bars are restored to their original state, and the compressive stress is contracted. Eventually it can be seen that the reinforcing bar can be stretched.

In addition, in the case of the tension material, when the tension force is applied by a tension means such as a hydraulic jack, the length change also occurs, and such tension force is contracted by the loss of the tension force introduced by the time factor, and thus the tension material can also be stretched. It can be seen that.

Referring to the case of the rebar as the elastic structural member 200, the optical fiber 110 is integrated with the surface of the rebar in advance as shown in FIG.

This optical fiber 110 is preferably to be secured over the entire length of the rebar. In addition, although one optical fiber sensor may be installed in the rebar, a plurality of optical fiber sensors may be installed in the longitudinal direction.

That is, the length of the optical fiber 110 fixed to the elastic structural member 200 is changed along with the expansion and contraction of the elastic structural member 200, the length change can be temporarily changed in the cross-sectional area of the optical fiber 110 To provide a factor.

2, the optical fiber 110 is first attached to the stretchable structural member 200 before the tension force is introduced. Accordingly, a predetermined pulsed light may be incident on the optical fiber 110 by the pulsed light output unit 121 and the laser diode 122 constituting the measuring means 120.

At this time, when the tension force is introduced to the stretchable structural member 200, the stretchable structural member 200 is increased in length. At this time, since the optical fiber 110 is fixed to the stretchable structural member 200, the length also increases together, which reduces the cross-sectional area of the optical fiber, thereby reducing the incident pulse light (incident pulse light).

In addition, in the state where the tension force is introduced to the elastic structural member 200, a phenomenon in which the tension force naturally introduced occurs as time elapses (called prestress loss over time). Structural member 200 is somewhat reduced in length, accordingly the optical fiber also has a slightly increased cross-sectional area to increase the incident pulsed light.

The present invention measures the electrical signal value due to the decrease and increase of the pulsed light incident on the stretchable structural member 200 as stretched as described above, and the amount of change in the tension force introduced into the stretchable structural member 200 through the measured signal value Is to estimate.

The estimation is performed by the pulse generating means 121, the laser diode 122, the coupling means 123, the optical detector 124, the amplifier 125 for amplifying such an electrical signal, the AD converter 126, The signal processor 127 may be analyzed in contrast with the analysis unit 128 and the display unit 129 including an analysis program and data that may be variously designed by a designer.

As a result, since the optical fiber sensor 100 of the present invention is fixed in advance before the tension force is introduced into the stretchable structural member 200, the most reliable measurement value is derived for the stretch (deformation) of the stretchable structural member 200. It is possible to, the elastic structural member 200 is able to measure the tension loss of the consistent elastic structural member 200, regardless of the tension method, such as pretension or post-tension method, the elastic structural member 200 Since it is installed in advance to be embedded in concrete, it is possible to measure the long tension loss necessary when always desired.

If the elastic structural member 200 is a reinforcing bar will be able to measure the yield of the reinforcing bars according to the elongation of such rebar,

If the stretchable structural member 200 is a FRP strip, a plate may also of course measure the loss of tension due to the extension of the FRP strip, plate.

According to FIG. 3, in particular, the optical fiber 110 of the present invention shows a state in which the flexible structural member 200 is reinforced.

The optical fiber 110 is first attached to the attachment sheet 130 in advance.

The attachment sheet 130 requires a certain durability, can be wound and formed in a roll form can be used carbon fiber sheet, glass fiber sheet for easy handling.

The optical fiber 110 is attached to the attachment sheet 130 so as to be integrated, which may use an adhesive tape or may be attached by other means.

In addition, the optical fiber 110 may be coated to protect the optical fiber 110, and the protective sheet 140 may be used by a method other than the coating.

In this case, since the bar 210 and the rib 220 are formed on the surface of the flexible structural member 200 that is a rebar, a kind of uneven portion is formed, such that the attachment sheet 130 and the flexible structural member 200 are integrated. It becomes a factor to disturb.

Accordingly, in the present invention, in order to secure the integration more reliably, an adhesive means 340 such as resin is used.

That is, the adhesive sheet 340 prevents the attachment sheet 130 in which the optical fiber 110 is integrated with the protective sheet 140 to prevent integration of the elastic sheet 110 by the surface of the stretchable structural member 200.

<Installation Example 1 of the Attachment Sheet 130 to the Flexible Structural Member 200: Fixed Attachment Sheet Mounting Device>

In the installation example 1, the optical fiber 110 is integrated on the surface of the stretchable structural member 200 which is the stretchable structural member 200, and the adhesive sheet 340 is attached to the attachment sheet 130 protected by the protective sheet 140. It can be said that it can be easily attached using.

To this end, the present invention uses an attachment sheet installation device 300, the attachment sheet installation device 300 to be temporarily fixed to the bottom of the factory.

The attachment sheet installation apparatus 300 is as shown in Figure 4a, 4b and 4c,

The elastic structural member 200 is installed to be formed inside, the housing portion 310 formed in one piece or separate type;

An inner support part 320 formed inside the lower surface of the housing so that the elastic structural member 200 is supported;

An adhesive means supply part 330 formed to supply an adhesive means 340 including a resin downward through the upper surface of the housing part 310 to the surface of the elastic structural member; And

And an adhesive means accommodating part 350 formed on the inner surface of the housing to accommodate the adhesive means supplied by the adhesive means supplying part 330 on the surface of the elastic structural member.

Attachment sheet supply means 360 for supplying the attachment sheet 330 to the attachment sheet installation device 300; and the rolling device 400 for moving the elastic structural member 200 is used.

The housing part 310 serves as a body part manufactured in the form of a square tube, and the material may be made of steel, plastic, or the like, and has a diameter such that the stretchable structural member 200, which is steel, can penetrate therethrough. The size and the like may vary depending on the fabrication, transportation, installation and elastic structural members.

The housing 310 is preferably manufactured to be divided and assembled into about half to facilitate installation, movement, transportation, and replacement later. The housing 310 is separated from the upper housing 311 and the lower housing 312 to be described later. It is desirable to facilitate the installation of rebar.

Accordingly, the housing 310 of the present invention may be manufactured in one piece, or may be divided into upper and lower detachable housing parts divided into upper and lower housing parts 311 and 312, and may be divided into three or more.

The inner support part 320 serves as a support part to allow the elastic structural member 200, which is a rebar, penetrating the housing part 310 to be supported on the inner lower surface, and has various sizes according to the shape of the elastic structural member 200. And surface forms. As a result, the reinforcing elastic structural member 200 may be fixed to the inside of the housing part 310, and also serves as a sliding part when the reinforcing elastic structural member 200 moves forward or backward.

The adhesive means supply unit 330 supplies the adhesive means 340 such as resin, which can integrate the attachment sheet 130 on which the optical fiber 110 is formed, to the flexible structural member 200, which is reinforced, through the housing part 310. As it is to

Preferably, as shown in Figure 4b, by forming a groove in the upper surface of the housing portion 310, the supply cylinder 331 for supplying the adhesive means 340, such as a resin in the groove is mounted, and then the supply cylinder ( It is configured to be composed of an injection tube 332 that can be injected into the surface of the flexible structural member 200 is reinforced from 331.

As a result, the adhesive means 340 such as the resin may be supplied to the surface of the flexible structural member 200 which is reinforced by the supply cylinder 331 and the injection tube 332 at a constant feeding speed and direction.

The adhesive means accommodating part 350 may be configured to set a position at which the adhesive means 340 such as the resin supplied by the supply cylinder 331 and the injection tube 332 is supplied to the surface of the flexible structural member 200 which is reinforced. As such, the adhesive means 340 such as resin is not supplied unnecessarily much, and the attachment sheet 130 is also able to be accurately set by the adhesive means accommodating part 350.

In this case, it is preferable to use the B-shaped member so that the inner side of the housing 310 is roughly installed at the central portion. The adhesive means accommodation portion 350 may be mounted on the inner side of the housing portion over the entire length of the housing portion, and may be mounted on the inner side of the housing portion in a fixed position only.

The attachment sheet supply means 360 is for supplying the attachment sheet 130 to the attachment sheet installation apparatus 300 as shown in Figure 4c, specifically, the attachment means 130 is attached to the inner surface of the housing portion It is for supplying to the receiving part 350.

Preferably, at least one roller 351 is installed around the adhesive means accommodating part 350 provided on the inner side of the housing part 310, and the attachment sheet 130 in contact with the roller is disposed inside the housing part 310. To ensure a smooth supply,

The attachment sheet 130 is supplied to the adhesion means accommodation portion 350 by the attachment sheet supply means 360 together with the protective sheet 140 in a state where the optical fiber 110 is attached in advance, and the adhesion means supply portion 330. Through the adhesive means 340 is also supplied to the adhesive means accommodating portion 350 to allow the attachment sheet 130 to be integrated on the surface of the elastic structural member 200 that is the final reinforcement.

In this case, a curing agent may be further added to the adhesive means 340 to rapidly integrate the attachment sheet 130 onto the stretchable structural member 200 surface.

Furthermore, in order to more effectively integrate the attachment sheet 130 on the surface of the flexible structural member 200, which is the reinforcing bar, the flexible structural member 200, which is the reinforcing bar, can be moved forward or backward by using the conventional rolling device 400. The rolling device 400 may also be configured as a movable rolling device (to facilitate the installation of the rolling device so as not to be permanently fixed) to be fixed or easy to transport, install, and operate. In addition, the attachment sheet installation apparatus 300 may be fixed to the floor (fixed type), and the attachment sheet supply means 360 is transported to the factory in a state where the attachment sheet 130 is formed in a roll form and installed on the floor And it is to be supplied to the attachment sheet installation device 300 while the attachment sheet 130 is continuously released. This is an advantage that the handling of the attachment sheet 130 is very easy to be exhibited.

As described above, the measurement means 120 is connected to the optical fiber 110 integrated with the elastic structural member 200 which is reinforced by the attachment sheet 130 as described above, and thus, it is possible to measure a desired sensored measurement value. In addition, in the case of non-reinforced PC strands, a fixing device is necessarily installed for the tension and fixation, and such a fixing device 400 is generally installed at the end of the PC strand.

Usually, the loss of tension force (prestress loss) introduced into the PC strand is mostly caused by the end of the PC strand being relaxed from the fixing apparatus, so in the present invention, an optical fiber is provided in the fixing hole formed in the fixing apparatus 400 as shown in FIG. It is preferable to allow the 110 to be installed and to connect the measuring means 120 to the optical fiber 110 extended to the fixing device.

Such a fixing device may be embedded together in the structure according to the tension method, or may be partially exposed to the outside. If the fixing device is embedded, the measuring means 120 may be connected to an extended optical fiber. The measuring means 120 may be provided directly in the fixing apparatus.

When the measuring means 120 is installed in the structure, the measuring instrument can be accessed even in common, so that the advantage of the structure maintenance, etc. is very efficient.

<Installation Example 2 of the Attachment Sheet 130 to the Flexible Structural Member 200: Removable Attachment Sheet Installation Device>

Compared with Example 1, Example 2 is different from the use of the mounting sheet installation apparatus 300 of the present invention in the field, not the factory. In order to move the attachment sheet installation device 300 itself, the movement roller portion 380 is to be installed on its bottom surface, and the attachment sheet 130 is pre-attached to the stretchable structural member 200 in advance. In the adhesive means 340 is to be integrated with the stretchable structural member 200.

That is, as shown in Fig. 5, the attachment sheet installation apparatus 300 is as shown in Figs. 4a, 4b and 4c.

The elastic structural member 200 is installed to be formed inside, the housing portion 310 formed in one piece or separate type;

An inner support part 320 formed inside the lower surface of the housing so that the elastic structural member 200 is supported;

An adhesive means supply part 330 formed to supply an adhesive means 340 including a resin downward through the upper surface of the housing part 310 to the surface of the elastic structural member; And

And an adhesive means accommodating part 350 formed on the inner surface of the housing to accommodate the adhesive means supplied by the adhesive means supplying part 330 on the surface of the elastic structural member.

That is, as shown in FIG. 5, the elastic structural member 200, which is first reinforced, is spaced apart from the site ground so as to be mounted on the support 370, and the attachment sheet 130 to which the optical fiber 110 is attached is used in advance. To temporarily attach to the reinforcing elastic structural member 200. In addition, the band-type fixing device 230 surrounding the stretchable structural member 200 may be further added so that the stretchable structural member 200 is tightly fixed to the support 370.

Next, the attachment sheet installation apparatus 300 passes through the flexible structural member 200 that is reinforced, and then the attachment sheet 130 is integrated with the elastic structural member 200 that is reinforced by the bonding means 340. Done.

This does not use the rolling device 400 installed to move the reinforcing elastic structural member 200, which is reinforced compared to the first embodiment in the front, or rear, instead of a moving roller unit installed on the bottom of the attachment sheet installation device 300 ( 380 to allow the operator to directly move the attachment sheet installation apparatus 300, the attachment sheet supply means 360 is not installed separately.

In the present invention, only the reinforcing bar as an example of the flexible structural member 200, but also in the case of a PC strand, since the surface is usually formed a bumpy concave and convex portion of the optical fiber using the mounting sheet installation apparatus 300 of the present invention ( 110 may be integrated, and the tension member of the FRP material may also integrate the optical fiber 110 using the attachment sheet installation apparatus 300 of the present invention.

Before the tension is introduced into the stretchable structural member according to the present invention, the optical fiber is directly integrated into the stretchable structural member by using an attachment sheet, and when the tension loss due to the optical fiber is measured, highly reliable results are always detected. As a result, more efficient quality control and maintenance of structural members is possible.

At this time, the attachment sheet is formed in the form of a roll is very easy to handle, the attachment sheet installation device is to be made in one piece or separate type so that the elastic structural member and the attachment sheet installation work is very easy.

An embodiment of the present invention described above and illustrated in the drawings should not be construed as limiting the technical spirit of the present invention. Those skilled in the art of the present invention can change and change the technical idea of the present invention in various forms. Therefore, such improvements and modifications fall within the protection scope of the present invention as long as it will be apparent to those skilled in the art.

Claims (9)

The optical fiber sensor is mounted on a flexible structural member in which deformation occurs due to compression and tensile stress caused by a working load, such as a concrete reinforcement including a steel reinforcement embedded in concrete or a PC strand or a tension member including a FRP member. Integrate the attachment sheet pre-attached to the optical fiber to the elastic structural member using an adhesive means including a resin, The measured value by the optical fiber sensor is set to the amount of change in the amount of light in accordance with the deformation of the optical fiber sensor, the measurement means of the elastic structural member using the optical fiber sensor, characterized in that the change in the strength of the elastic structural member due to the amount of change in the light at all times Performance diagnostic method. The apparatus of claim 1, wherein an attachment sheet mounting apparatus for integrating the attachment sheet to the stretchable structural member is used. A housing part manufactured in one piece or in a separate type and installed to have an elastic structural member formed therein; An inner support part formed on an inner side of a lower surface of the housing part to support the elastic structural member; An adhesive means supply unit configured to supply an adhesive means including resin downward through the upper surface of the housing part to an outer circumferential surface of the elastic structural member; And And an adhesive means accommodating portion formed on the inner surface of the housing portion to accommodate the adhesive means supplied by the adhesive means supplying portion on the surface of the elastic structural member. According to claim 2, wherein the attachment sheet installation device is fixed to the fabrication site for manufacturing the stretchable structural member, while moving the stretchable structural member using a movable or fixed rolling device installed separately in the production site, attachment sheet supply means A method for diagnosing the performance of a flexible structural member using an optical fiber sensor, characterized in that the attachment sheet is attached to the surface of the flexible structural member by supplying the attachment sheet between the adhesive means accommodation portion and the flexible structural member. According to claim 2, wherein the attachment sheet installation device is installed at the site of the installation of the elastic structural member, in the state in which the attachment sheet is temporarily attached to the surface of the elastic structural member in advance, the attachment sheet mounting apparatus formed on the bottom surface A method of diagnosing a performance of a flexible structural member using an optical fiber sensor, wherein the adhesive sheet is attached to a surface of the flexible structural member by supplying the adhesive means through the adhesive means accommodating part while moving. 4. The method of claim 3, wherein the attachment sheet is formed by winding an attachment sheet in which a fiber is pre-attached to the attachment sheet supplying means in a roll form. The optical fiber sensor according to any one of claims 1 to 5, wherein when the tension member is installed as the elastic structural member, the optical fiber sensor is further extended to the fixing device for the tension member, and the optical sensor and the display unit are included in the extended optical fiber sensor. Performance diagnostic method of a flexible structural member using an optical fiber sensor, characterized in that the measuring means to be installed. The method according to any one of claims 1 to 5, wherein the attachment sheet is installed over the entire length of the flexible structural member or only a part of the length thereof. The optical fiber sensor according to any one of claims 1 to 5, wherein a protective sheet including an adhesive tape is further formed on the optical fiber sensor to protect the optical fiber sensor attached to the attachment sheet. Method for diagnosing performance of flexible structural members. According to claim 4, The stretchable structural member is stretched using an optical fiber sensor characterized in that the band-type fixing device for wrapping the stretchable structural member is further installed so that the stretchable structural member tightly fixed to the support in a state that is mounted on the support. Method for diagnosing performance of structural members.

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