JP2002328010A - Jig and method for installing optical fiber for measuring strain - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize holding an optical fiber until the time when adhesive is set and guaranteeing against the deterioration of adhesive with time in the case of installing the optical fiber for measuring strain onto a structure to be monitored using the adhesive. SOLUTION: The method for installing optical fiber for measuring strain, in which the optical fiber for measuring strain is integrally fixed to the surface of the structure, is provided with a step in which a resin layer 15 is formed inside a gutterlike cover 1 where gaff-like projections 10 are ejected from side edges 9, a step in which the optical fiber for measuring strain 5 is inserted so as to be placed on the resin layer 15 inside the gutter-like cover 1, a step in which the rest of the inside except the resin layer 15 of the gutter-like cover 1 is filled with the adhesive, and a step in which the gaff-like projections 10 ejected from the side edges 9 of the gutter-like cover 1 are engaged to a loop plane installed on the structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jig used for laying an optical fiber for strain measurement on a structure to be monitored in order to monitor deformation of the structure, and a laying method.

[0002]

2. Description of the Related Art In order to monitor the deformation of a structure or the ground, an optical fiber is laid as a "strain sensor" on the structure or the ground to be monitored, and the degree of distortion is determined based on a change in light incident on the optical fiber. As a method of detecting the position and the position, an optical fiber strain measurement method (BOTDR, JP-A-2000-258136, etc.), a fiber grating (FG), and the like are already known. The advantage of using light in this way is that the distortion
(Breakage position of structures, etc.) can be known, even small distortion can be accurately detected, and there is no electrical influence
(Less noise) and so on, and have been used in various scenes to date.

[0003] It is important to lay the optical fiber as a strain sensor so that the optical fiber behaves in conformity with the structure to be monitored. In addition, if the structure to be monitored is large or wide, the total length of the optical fiber to be laid naturally becomes long, and the efficiency of the laying work becomes important. Initially, in order to lay the optical fiber along the surface of the structure, etc., (a) the optical fiber is directly attached to the surface of the structure using an adhesive and fixed, or (b) the U-shaped The optical fiber was fixed by hitting a nail or the like.

[0004] In contrast to the conventional methods (a) and (b),
In JP-A-2000-258136, at least one through hole formed in the jig body to pass a fixture for fixing the jig body to a measurement target, and the jig body is disposed in the jig body.
By using a mounting jig provided with an openable and closable optical fiber gripping mechanism for fixing an optical fiber to the jig main body and a connecting portion for connecting a predetermined tension adjuster to the jig main body, It has realized both ease of work and improvement of work efficiency.

[0005]

SUMMARY OF THE INVENTION The above-mentioned Japanese Patent Application Laid-Open No. 2000-258136
In the background that No. developed the mounting jig as described above, the method of fixing the optical fiber with an adhesive and the method of fixing the There was a problem. Among them, (a) about the method of fixing with adhesive,
Although the laying operation itself is simple, it was necessary to fix the position of the optical fiber until the adhesive was cured, and as a result, the construction efficiency was reduced. In particular, when the surface of the structure is wet, it is pointed out that there are restrictions on construction conditions such as a decrease in bonding ability and deterioration of the adhesive over time.

However, it is preferable that the optical fiber is fixed with an adhesive and attached to the surface of the structure to be monitored as a whole, rather than partially constraining the optical fiber like a jig or the like.
As is clear from the above, the biggest problem with the adhesive is (1) holding the optical fiber until the adhesive is cured,
(2) It is a guarantee against deterioration of the adhesive over time. Therefore, from the ease of laying work, in order to realize the fixing of the optical fiber using the adhesive, the (1) holding of the optical fiber until the adhesive is cured, and (2) the deterioration of the adhesive over time In order to realize the guarantee for the above, a concrete optical fiber laying method was studied.

[0007]

SUMMARY OF THE INVENTION As a result of the study, a jig used for laying an optical fiber for strain measurement on a structure to be monitored to monitor the deformation of the structure has been developed. , One of the surface fasteners to be attached to the structure to be monitored, and a gutter-shaped cover for inserting an optical fiber for strain measurement inside and filling the adhesive, and the gutter-shaped cover has a surface fastener protruding from a side edge. Is an optical fiber laying jig for strain measurement provided with the other. The term "surface fastener" as used herein refers to an engaging member that engages a male engaging unit with a female surface, and the male engaging unit does not have a two-dimensional spread and has a gutter-shaped cover. May be arranged in a line in the direction of extension of. Specifically, one of the hook-and-loop fasteners may be a loop surface (female portion) wider than the gutter-shaped cover, and the other hook-and-loop protrusion (male portion) may be arranged along the side edge.

The above-mentioned laying jig uses a gutter-like cover attached to a structure where it is difficult to fix the optical fiber only by direct bonding, by using a hook-and-loop fastener. Aim to fix. If one of the surface fasteners is a loop surface, various conventionally known mounting means can be used for the structure, and particularly, a strong mounting by adhesion can be performed. The gutter-shaped cover in which one of the hook-and-loop fasteners is filled with an adhesive and the other of the hook-and-loop fasteners is engaged, after solidifying the adhesive, isolates the solidified adhesive from the surrounding environment. Can be suppressed.

For a structure to which an optical fiber can be fixed by direct bonding, a simpler laying jig can be constructed.
Namely, a strain measuring optical fiber laying jig comprising a gutter-like cover in which a strain measuring optical fiber is inserted inside and filled with an adhesive, and an adhesive surface for bonding to a structure is provided on a side edge of the gutter-like cover. It is. Adhesive surface is preferably flange-like with an area in contact with the structure, does not require long-term adhesive strength, but in addition to applying an adhesive with immediate adhesive strength, the simplest structure using double-sided tape Can be exemplified.

Here, the "adhesive" to be filled in each gutter-shaped cover is one which can solidify and carry the optical fiber and is integrally connected to one of the surface fasteners attached to the structure. This is a functional term that brings about the effect of the binding. The type of the adhesive is not limited, but those made of a resin, particularly generally known adhesives, are suitable. Such an adhesive is appropriately given conditions such as acid resistance and water resistance according to the surrounding environment of the structure on which the optical fiber is to be laid. Similarly, one of the hook-and-loop fasteners and the gutter-like cover are made of synthetic resin, and the material is selected in accordance with the above-described conditions such as acid resistance and water resistance.

The structures to be monitored include bridges,
Examples include structures such as buildings, tunnels, and lifelines such as sewer pipes, gas pipes, and common trenches. Of these, most can be handled only by a trough-shaped cover with an adhesive surface on the side edge, but for structures where the presence of moisture or oil is recognized in the surrounding environment, such as a sewer, A laying jig having a configuration in which one of the hook-and-loop fasteners (the loop face) is stuck and the other hook-shaped projection of the hook-and-loop fastener projecting from the side edge is engaged. Further, if a concrete surface or a metal surface is provided on the ground so that one of the surface fasteners can be attached, the concrete surface or the metal surface can be applied as a structure.

When a plurality of projections are provided on the surface of the gutter-like cover, damage (eg, galling) by the small animal that causes physical damage can be prevented by utilizing the habit of the small animal that repels the projection. An optical fiber as a “strain sensor” to which the present invention is applied is useless if there is damage other than deformation of a structure to be monitored. It is especially important to avoid damage to small animals. If the gutter-shaped cover is formed of a synthetic resin, it is easy to provide such a plurality of protrusions, and these protrusions can prevent the damage of the optical fiber by small animals.

Further, the gutter-shaped cover is covered with (a) a tension member extending in a direction in which the gutter-shaped cover extends.
Or (b) it is good to incorporate. As pointed out in Japanese Patent Application Laid-Open No. 2000-258136, `` The initial strain of the sensor wire (optical fiber), that is, the tension applied at the time of installation affects the measurement frequency width, so that it is managed so as to be uniform. There is a need
([0006] etc.) ". Therefore, is it necessary to cover the tension member with a gutter-like cover that is integrated with the optical fiber by solidifying the adhesive (actually, when attaching the tension member to the surface)?
((a)) A uniform initial distortion is realized by incorporating a tension member in the gutter-shaped cover itself. At this time, so that tension by the tension members is evenly obtained,
The gutter-shaped cover may have a U-shaped cross section, and a tension member may be provided on each surface to cover or incorporate the tension member. When the tension member is covered or built into the optical fiber itself inserted into the gutter-shaped cover, the tension member for the gutter-shaped cover may not be provided.

The optical fiber inserted into the inside of the gutter-like cover is directly placed on the inside of the gutter-like cover as it is, and can be surely carried by the filled adhesive. In the event that the gutter-shaped cover separates, there is no danger that the optical fiber will be exposed to the surrounding environment at a stretch. Therefore, a resin layer that is integrated with the adhesive filling the inside of the gutter-shaped cover is formed. The resin constituting the resin layer is not particularly limited, but is preferably formed by solidifying an adhesive that has been poured beforehand so as not to fill the inside of the gutter-shaped cover. The adhesive to be bonded to one of the surface fasteners attached to the structure is filled with the optical fiber placed on the resin layer, and the optical fiber is completely wrapped with the resin layer and the adhesive. In this way, even if the gutter-shaped cover is separated, the optical fiber can be avoided from the danger of being directly exposed to the surrounding environment by being surrounded by the resin layer and the adhesive.

To improve the monitoring accuracy of the "strain sensor",
It is conceivable to lay a plurality of optical fibers in parallel (the size of the parallel interval can be freely determined depending on the monitoring target). in this case,
A plurality of gutter-shaped covers may be provided in the width direction, and may be integrally fixed to the structure. The adhesive filled inside each gutter-like cover increases the bonding strength as a whole. Further, when the other of the surface fasteners protruding from the side edge of each gutter-shaped cover is provided, or the bonding surface is provided on each side edge, the temporary holding until the adhesive is solidified becomes more stable.

The laying jig utilizing the engagement of the hook-and-loop fastener follows the procedure of the following laying method. In order to monitor the deformation of the structure, when laying the optical fiber for strain measurement on the structure to be monitored, prepare the laying by the procedure of attaching one of the surface fasteners to the structure to be monitored. A)
Procedure for forming a resin layer inside a gutter-shaped cover provided with the other of the surface fasteners protruding from the side edge, procedure for inserting an optical fiber for strain measurement so as to be placed on the resin layer inside the gutter-shaped cover, gutter-shaped cover Through a procedure of filling the inside of the residue except for the resin layer of the adhesive with an adhesive, and a procedure of engaging the other of the hook-and-loop fastener projecting from the side edge of the gutter-shaped cover with one of the hook-and-loop fasteners attached to the structure. This is a method for laying an optical fiber for strain measurement in which an optical fiber for strain measurement is integrally fixed to the surface.

In the above (A) laying method, the gutter-like cover is filled with an adhesive for bonding, and then the gutter-like cover is engaged with one of the surface fasteners attached to the structure, and the engagement of the surface fastener is performed. Temporary holding and bonding with an adhesive are performed simultaneously. The procedure for attaching one of the hook-and-loop fasteners to the structure may be either before or after the procedure for the gutter-like cover, but is usually performed prior to the procedure for the gutter-like cover as preparation for laying. When one of the surface fasteners is attached to a structure by bonding, a cleaning procedure for cleaning the surface of the structure and removing impurities such as oils may be further performed in order to secure sufficient bonding strength. The loop surface can be sequentially adhered while being fed from a roll.

(B) a procedure of inserting an optical fiber for strain measurement inside a gutter-shaped cover provided with the other of the surface fasteners protruding from the side edge; A step of forming a resin layer between the steps, a step of filling the inside of the residue except the resin layer of the gutter-shaped cover with an adhesive, and a step of attaching the other of the surface fasteners projecting from the side edges of the gutter-shaped cover to the structure. A method for laying an optical fiber for strain measurement, in which the optical fiber for strain measurement is integrally fixed to the surface of the structure through a procedure of engaging one side, may be used.

Here, one of the hook-and-loop fasteners used in each of the above-mentioned laying methods is a loop surface wider than the width of the gutter-like cover, and the other hook-and-loop fastener is a hook-like projection arranged along the side edge. Construction work becomes easier. Theoretically, one of the hook-and-loop fasteners can be a male part (hook surface) and the other can be a female part (loop surface). Therefore, there is a possibility that the engagement strength is reduced as a result. Rather, it is preferable that one of the hook-and-loop fasteners be used as a loop surface to form a wide adhesive surface with the structure, and to provide a hook-like projection on the side edge of the gutter-like cover that firmly engages the loop surface. The "surface fastener" referred to in the present invention is such that both engaging surfaces are not only planar shapes but also one surface shape such as a combination of the loop surface and the hook-like projections. Also includes combinations in which the parts (hook-like projections) are arranged.

In the laying methods (A) and (B), prior to the step of filling the inside of the gutter-shaped cover except the resin layer with the adhesive, the other of the surface fasteners projecting from the side edges of the gutter-shaped cover is used. May be engaged with one of the surface fasteners attached to the structure. Since the adhesive for fixing the optical fiber and the gutter-shaped cover to one of the hook-and-loop fasteners generally has fluidity, the adhesive can be poured after the gutter-shaped cover is first engaged with one of the hook-and-loop fasteners. In this case, it is preferable that the gutter-shaped cover divides the laying range into a plurality of sections, engages with each unit length, and flows in the adhesive sequentially to be fixed. In particular, in the (B) laying method, (b) prior to the procedure of inserting the strain measurement optical fiber inside the gutter-shaped cover, the other of the surface fasteners projecting from the side edges of the gutter-shaped cover was attached to the structure. A procedure for engaging one of the hook-and-loop fasteners can also be performed.

In the case of a laying tool that does not use one of the hook-and-loop fasteners, (C) a procedure of forming a resin layer inside a gutter-like cover having an adhesive surface on its side edge for bonding to a structure; Procedure for inserting optical fiber for strain measurement so that it is placed on the layer, Procedure for filling adhesive inside the gutter-shaped cover except for the resin layer, Bonding surface provided on the side edge of the gutter-shaped cover to the structure After that, a strain measuring optical fiber laying method of integrally fixing the strain measuring optical fiber to the surface of the structure is used. This is a procedure according to the above (A) laying method.

(D) A procedure for inserting a strain measuring optical fiber inside a gutter-shaped cover provided with an adhesive surface for bonding to a structure on a side edge, Through a procedure of forming a resin layer during the procedure, a procedure of filling the inside of the residue except the resin layer of the gutter-shaped cover with an adhesive, and a procedure of joining an adhesive surface provided on a side edge of the gutter-shaped cover to the structure, A method of laying an optical fiber for strain measurement in which an optical fiber for strain measurement is integrally fixed to the surface of the structure may be used. this is,
This is a procedure according to the above (B) laying method.

Similarly, in the above (C) and (D) laying methods, prior to the step of filling the inside of the gutter-shaped cover except the resin layer with the adhesive, the bonding provided on the side edge of the gutter-shaped cover is performed. A procedure may be followed for joining the surface to the structure. In addition, in the laying method, prior to the procedure of inserting the optical fiber for strain measurement inside the gutter-shaped cover, the procedure of joining the adhesive surface provided on the side edge of the gutter-shaped cover to the structure is described. You can also go through.

Each of the above laying methods does not include a procedure for making the initial strain uniform. If the tension member is covered or built in the optical fiber itself to be laid, the tension member is not particularly necessary for the laying jig. Conversely, if a laying jig is required to have a structure for uniform initial strain, either (a) cover the tension member on the gutter-like cover or (b) It is good to have a tension member built-in. From the viewpoint of facilitating the construction, it is preferable to cover the tension members that can change the order of the procedures as appropriate and can be applied or not applied. In this case, a protective cover with a built-in tension member that covers the gutter-like cover may be used.

[0025]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a gutter-shaped cover 1 having a U-shaped cross section and a loop surface 8 according to the present invention.
FIG. 2 is a perspective view of a gutter-like cover 2 provided in a plurality in the width direction, FIG. 3 is a perspective view of a gutter-like cover 4 having a plurality of protrusions 3 on the surface, and FIG. 4 is a gutter-like cover 1 of FIG. FIG. 4 is a cross-sectional view illustrating a state in which the strain measurement optical fiber 5 is laid on the inner surface of the sewer pipe 6 using the method shown in FIG. In this example, the communication line laid in the sewer pipe 6
(Optical fiber) In order to monitor the sewage pipe 6 as a structure for the optical fiber 7, an example in which the optical fiber 5 is laid in parallel with the communication line 7, and a loop surface (one of hook-and-loop fasteners,
This is the case where the gutter-like cover 1 in which hook-like projections (the other male surface of the hook-and-loop fastener, male surface) 10 are arranged along the side edge 9 is engaged.

The gutter-shaped cover 1 of the present invention is not particularly limited in structure as long as it has a cross-sectional shape for receiving the optical fiber 5, but, for example, as shown in FIG. In addition to this, the tension member 11 can be assigned to each surface and attached. The tension member 11 is built in the gutter-shaped cover 1 itself (see a broken line in FIG. 1), or is covered by a protective cover 17 described later. The tension member has a high tensile strength and a high tensile modulus, and can use a low-stretch steel fiber or an aramid fiber. To prevent. On the side edge 9 of the gutter-shaped cover 1, two-step mountain-shaped hook-shaped projections 10 are provided intermittently, and engage with the pair of loop surfaces 8. Loop surface 8
Is attached to the structure via an adhesive 16. As a material of the gutter-shaped cover 1, various synthetic resins such as polyvinyl chloride, polyolefin, polyester, and polyamide can be exemplified in consideration of the environment inside the sewer pipe. Such a synthetic resin has an advantage that the hook-shaped protrusion 10 can be formed integrally with the gutter-shaped cover 1. The material of the loop surface 8 is nylon,
A woven fabric such as polyester or polypropylene can be exemplified.

When the synthetic resin is integrally molded, as shown in FIG. 2, a gutter-shaped cover 2 is provided in a plurality in the width direction, or as shown in FIG. The gutter-shaped cover 4 provided with the plurality of projections 3 can be easily manufactured. The plurality of continuous gutter-shaped covers 2 are used to improve the strain monitoring accuracy by laying a plurality of optical fibers side by side. In addition, when laying in a sewer pipe as in this example, damage from small animals (especially rats) can be imagined,
Using a gutter-shaped cover 4 provided with a plurality of projections 3, small animals are repelled so as not to be bitten. The projection 3 does not necessarily have to be sharp, and if the tip is rounded to have flexibility, the operator's hand will not be damaged during handling.

The gutter-shaped cover 1 constitutes a laying jig integrally with the pair of loop surfaces 8 and, as shown in FIG. 4, lays the optical fiber 5 in parallel with the communication line 7. Offer. As with the laying jig of the present invention, the communication line 7 is laid by engaging and bonding a fitting 13 for inserting the conduit 12 into a loop surface 8 attached to the inner surface of the sewer pipe 6. The upper surface of the attachment 13 is provided with a hook surface (male surface) 14, which is engaged with the loop surface 8 with an adhesive applied to the hook surface 14 and solidifies the adhesive to attach the attachment 13 to the inner surface of the drain pipe 6. Stick to The gutter-shaped cover 1 is engaged with, adhered to, and adheres to the same loop surface 8 symmetrically with respect to the mounting fixture 13.

FIGS. 5 to 10 are partially enlarged sectional views showing the procedure of construction at the portion indicated by the arrow A in FIG. 4. FIG. 5 is a procedure for attaching the loop surface 8, and FIG. Resin layer 15 forming procedure,
7 is a procedure for placing the optical fiber 5, FIG. 8 is a procedure for filling the adhesive 16 inside the remainder excluding the resin layer 15, FIG. 9 is a procedure for engaging the gutter-shaped cover 1 with the loop surface 8, and FIG. FIG. 11 shows a state in which the laying has been completed by the solidification of the agent 16, and FIG. 11 is a sectional view corresponding to FIG. 10 showing a state in which the gutter-like cover 1 is covered with a protective cover 17 incorporating the tension member 11 in order to make the initial strain uniform. It is. In the laying method according to the present invention, the resin layer 15 inside the gutter-shaped cover 1 is formed, the optical fiber 5 is inserted and the loop surface 8 is formed.
There are various modes before and after each procedure of the engagement with, and the following procedure is an example of the (A) laying method.

First, as a preparation for laying, the loop surface 8 is attached to the inner surface of the sewer pipe 6 which is a structure to be monitored. As shown in FIG. 4, the loop surface 8 in this example is also a support member for supporting the mounting member 13 for laying the communication line 7, and it is necessary to secure sufficient mounting strength to the inner surface of the sewer pipe 6.
For this reason, as shown in FIG. 5, a glass cloth 18 having high resin impregnating performance is sewn onto the loop surface 8 formed of synthetic resin fibers, and an adhesive (not shown) is With such a structure, the loop surface 8 is adhered to the inner surface of the sewer pipe 6. In this way, the loop surface 8 adhered to the inner surface of the sewer pipe 6 serves as a base for fixing the attachment 13 and the gutter-like cover 1.

Next, as shown in FIG. 6, a resin layer 15 is formed inside the gutter-shaped cover 1 (see FIG. 1). The resin layer 15 uses an adhesive 16 (epoxy resin or the like) used when attaching the gutter-shaped cover 1 to the loop surface 8. And
With the optical fiber 5 placed on the formed resin layer 15 as shown in FIG. 7, an adhesive 16 for mounting is poured inside the remaining portion of the gutter-shaped cover 1 as shown in FIG. Then, the gutter-shaped cover 1 is brought into close contact with the loop surface 8 by engaging with the loop surface 8 using the hook-shaped projections 10 on the side edges 9 as shown in FIG. At this time, the adhesive 16 exudes and penetrates into the loop surface 8, so that not only the attachment by simple adhesion but also the adhesive 16 carries the fibers on the loop surface 8, thereby realizing a firm fixation. Thus, the installation of the optical fiber 5 is completed as shown in FIG.

In this embodiment, as shown in FIG. 11, the tension member 11 is further attached to the gutter-shaped cover 1 which has been fixed.
By integrating the protective cover 17 incorporating the above by bonding, the initial strain of the optical fiber 5 is made uniform. When the protective cover 17 is covered on the gutter-shaped cover 1 as described above, the projections 3 for repelling small animals may be provided on the surface of the protective cover 17 (see broken lines in FIG. 11). Tension member
The gutter 11 may be directly covered on the surface of the gutter-shaped cover 1 alone, but it is easy to handle the tension member 11, to cover the gutter-shaped cover 1 easily, and to provide the protrusions 3 and the like. Therefore, it is preferable to use the protective cover 17 having the tension member 11 built therein as in this example.

In the above description of the procedure, each of the laying jigs is shown only in a cross section. However, in actuality, each member is long in the direction in which the sewer pipe 6 extends, and after the laying, FIG. (An overall perspective view of an optical fiber 5 laid using a tool). Here, instead of covering the entire optical fiber 5 with the gutter-shaped cover 1 over the entire inner surface of the sewer pipe 6 to be monitored, the slack portion 19 is formed by partially exposing the optical fiber 5 from the gutter-shaped cover 1. It may be used for adjusting the initial distortion. Since there is no tension member in the slack portion 19, the tension member covering the gutter-like cover acts for each predetermined length range sandwiched by the slack portion 19, and has an advantage that the initial strain can be easily adjusted. .

FIG. 13 shows a laying jig comprising a hook surface (one of the hook-and-loop fasteners) 20 to be attached to the structure and a gutter-like cover 22 having a loop surface (the other hook-and-loop fastener) 21 on the side edge 9. FIG. 14 is a perspective view equivalent to FIG. 1 and FIG. 14 is a perspective view equivalent to FIG. 1 of a laying jig including a gutter-like cover 24 provided with an adhesive surface 23 on the side edge 9. The hook-and-loop fastener has a pair of male and female surfaces, and in the present invention, it is possible to assign any surface to each of the structure and the gutter-shaped cover. Therefore, as shown in FIG. 13, for example, a hook surface 20 in which hooks 25 are arranged two-dimensionally may be attached to a structure, and a loop surface 21 may be formed on the side edge 9 of the gutter-shaped cover 22. In this example, the loop surface 21 is formed by making the side edge 9 arc-shaped in cross section in order to make the joining direction of the loop surface 21 to the hook surface 20 free.

When the gutter-like cover can be directly attached to the structure, as shown in FIG. 14, the adhesive surface 23 made of the double-sided tape 26 attached to the flange 28 provided on the side edge 9 is used. It is preferable to use the gutter-shaped cover 24 provided. Bonding surface
Since the bonding by 23 is basically a temporary holding until the adhesive for fixing the optical fiber 5 is solidified, there is no problem even if the adhesive strength is reduced after laying. The double-sided tape 26 peels off the release paper 27 as needed during the laying operation and joins the gutter-like cover 24 to the structure. There is an advantage that construction is easier than in the case of using a surface fastener. Instead of the double-sided tape, a quick-acting adhesive may be used.

[0036]

According to the present invention, stable and long-term stable laying of an optical fiber for strain measurement using bonding is realized. At the time of construction, engagement of one of the hook-and-loop fasteners attached to the structure with the other of the hook-and-loop fastener provided on the gutter-shaped cover,
Alternatively, the bonding by the bonding surface of the gutter-shaped cover (1) solves the problem of holding the optical fiber until the adhesive is cured. In addition, the work of engaging the surface fastener, which enables the optical fiber to easily contact the structure with the surface, and the work of bonding with the adhesive surface improve the construction efficiency. The engagement of the hook-and-loop fastener also contributes to the structural stability of the optical fiber after installation.

(2) Assurance against the deterioration of the adhesive over time is as follows:
The problem is solved by a structure in which the resin layer and the solidified adhesive are integrally held to carry the optical fiber, and (ii) protection of the resin layer and the solidified adhesive by the trough-shaped cover. Further, when the engagement by the hook-and-loop fastener is used, there is an advantage that (iii) the engagement itself is combined with the fixation and the deterioration of the adhesive is compensated. As described above, the solidification of the adhesive according to the present invention not only plays a role in attaching the optical fiber as the adhesive, but also has a structure in which one of the surface fasteners attached to the structure (for example, the loop surface) is partially supported. Realizes strong fixation. This eliminates the possibility that the optical fiber will fall off even if the bonding strength is reduced. Also, since the optical fiber itself is wrapped around (supported) by a resin layer and a solidified adhesive,
Unless the resin layer and the solidified adhesive are physically damaged,
Do not allow the optical fiber to fall off.

Since the resin layer and the solidified adhesive are covered by the gutter-shaped cover, the resin layer and the solidified adhesive are prevented from deteriorating, and the optical fiber is liable to fall off. Even so, the gutter-shaped cover can support. Further, if the gutter-like cover is covered with a protective cover for covering the tension member, the deterioration of the adhesive and the support of the optical fiber can be double-protected. As described above, the present invention has the effect of solving the problem of laying an optical fiber by bonding, which has been regarded as a problem in the past, and providing an easier and more stable laying method.

[Brief description of the drawings]

FIG. 1 is a perspective view of a gutter-shaped cover having a U-shaped cross section and a loop surface according to the present invention.

FIG. 2 is a perspective view of a plurality of gutter-shaped covers provided continuously in the width direction.

FIG. 3 is a perspective view of a gutter-like cover provided with a plurality of protrusions on a surface.

FIG. 4 is a cross-sectional view illustrating a state in which an optical fiber for strain measurement is laid on an inner surface of a sewer pipe using the gutter-shaped cover of FIG.

FIG. 5 is a partially enlarged cross-sectional view showing a procedure for attaching a loop surface.

FIG. 6 is a partially enlarged sectional view showing a resin layer forming procedure.

FIG. 7 is a partially enlarged sectional view showing an optical fiber mounting procedure.

FIG. 8 is a partially enlarged sectional view showing an adhesive filling procedure.

FIG. 9 is a partially enlarged cross-sectional view showing a procedure of engaging a gutter-like cover with a loop surface.

FIG. 10 is a partially enlarged cross-sectional view illustrating a state in which laying has been completed by solidification of an adhesive.

FIG. 11 is a sectional view corresponding to FIG. 10 showing a state in which a protective cover having a tension member built therein is covered by a gutter-shaped cover.

FIG. 12 is an overall perspective view of an optical fiber laid using the laying jig of the present invention.

FIG. 13 is a perspective view corresponding to FIG. 1 of a laying jig including a hook surface to be attached to a structure and a gutter-like cover having a loop surface on a side edge.

FIG. 14 is a perspective view corresponding to FIG. 1 of a laying jig composed of a gutter-shaped cover provided with an adhesive surface on a side edge.

[Explanation of symbols]

 1 Gutter-like cover 5 Optical fiber for strain measurement 8 Loop surface (one side of hook-and-loop fastener, female face) 9 Side edge 10 Hook-shaped protrusion (other face of hook-and-loop fastener, male face) 11 Tension member 15 Resin layer 16 Adhesive 17 Protective cover

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) H02G 1/06 309 H02G 1/06 309J F term (Reference) 2F065 AA65 BB05 CC14 CC40 DD03 DD06 FF41 LL02 TT06 UU03 2H038 AA02 CA33

Claims (19)

[Claims] 1. A jig used to lay an optical fiber for strain measurement on a structure to be monitored in order to monitor deformation of the structure, wherein the jig is one of surface fasteners attached to the structure to be monitored. And a gutter-shaped cover through which the strain-measuring optical fiber is inserted and filled with an adhesive, wherein the gutter-shaped cover is provided with the other of the surface fasteners protruding from the side edges. jig. 2. The strain measuring optical fiber laying jig according to claim 1, wherein one of the surface fasteners is a loop surface wider than the width of the gutter-shaped cover, and the other of the surface fasteners is a hook-shaped protrusion arranged along a side edge. Utensils. 3. A jig used for laying an optical fiber for strain measurement on a structure to be monitored in order to monitor deformation of the structure, wherein the optical fiber for strain measurement is inserted inside. An optical fiber laying jig for strain measurement, comprising a gutter-like cover filled with an adhesive, and having an adhesive surface for bonding to a structure on a side edge of the gutter-like cover. 4. The optical fiber laying jig for strain measurement according to claim 1, wherein a plurality of projections are provided on a surface of the gutter-shaped cover. 5. The optical fiber laying jig for strain measurement according to claim 1, wherein a tension member extending in a direction in which the gutter-like cover extends is covered by the gutter-like cover. 6. The optical fiber laying jig for strain measurement according to claim 1, wherein the gutter-like cover has a built-in tension member extending in a direction in which the gutter-like cover extends. 7. The optical fiber laying jig for strain measurement according to claim 1, wherein a resin layer integrated with an adhesive filling the inside of the gutter-like cover is formed. 8. The optical fiber laying jig for strain measurement according to claim 1, wherein a plurality of gutter-shaped covers are continuously provided in the width direction. 9. When laying an optical fiber for strain measurement on a structure to be monitored to monitor deformation of the structure, preparation for laying is performed by a procedure of attaching one of surface fasteners to the structure to be monitored. A procedure for forming a resin layer inside the gutter-like cover provided with the other of the surface fasteners protruding from the side edge, a procedure for inserting an optical fiber for strain measurement so as to be placed on the resin layer inside the gutter-like cover, Through a procedure of filling the inside of the remainder except the resin layer of the flaky cover with an adhesive, and a procedure of engaging the other of the surface fasteners projecting from the side edges of the gutter-like cover with one of the surface fasteners attached to the structure. A method for laying an optical fiber for strain measurement in which an optical fiber for strain measurement is integrally fixed to the surface of an object. 10. In order to monitor deformation of a structure, when laying an optical fiber for strain measurement on a structure to be monitored, a preparation for laying is performed by a procedure of attaching one of surface fasteners to the structure to be monitored. Then, a procedure of inserting the strain measuring optical fiber inside the gutter-shaped cover provided with the other of the surface fasteners protruding from the side edge, forming a resin layer between the inside of the gutter-shaped cover and the strain measuring optical fiber. Steps of filling the adhesive inside the gutter-shaped cover except for the resin layer, and steps of engaging the other of the hook-and-loop fastener protruding from the side edge of the gutter-shaped cover with one of the hook-and-loop fasteners attached to the structure And a method for laying an optical fiber for strain measurement, wherein the optical fiber for strain measurement is integrally fixed to the surface of the structure. 11. The strain measuring device according to claim 9, wherein one of the surface fasteners is a loop surface wider than the width of the gutter-shaped cover, and the other of the surface fasteners is a hook-shaped protrusion arranged along a side edge. Optical fiber laying method. 12. A hook-and-loop fastener in which the other of the hook-and-loop fasteners protruding from the side edge of the gutter-like cover is attached to a structure prior to a step of filling an adhesive inside the gutter-like cover except for the resin layer. 11. The method according to claim 9 or 10, wherein
An optical fiber laying method for strain measurement according to any one of the above. 13. Prior to the procedure of inserting the strain measuring optical fiber inside the gutter-shaped cover, the other of the surface fasteners projecting from the side edge of the gutter-shaped cover is engaged with one of the surface fasteners attached to the structure. 13. The method for laying an optical fiber for strain measurement according to claim 12, wherein the method comprises the steps of: 14. A gutter-like cover having an adhesive surface for bonding to a structure on a side edge when laying an optical fiber for strain measurement on the structure to be monitored in order to monitor the deformation of the structure. A step of forming a resin layer on the inside, a step of inserting an optical fiber for strain measurement so as to be placed on the resin layer inside the gutter-like cover, a procedure of filling an adhesive inside the remainder excluding the resin layer of the gutter-like cover, A method for laying an optical fiber for strain measurement in which an optical fiber for strain measurement is integrally fixed to the surface of the structure through a procedure of joining an adhesive surface provided on a side edge of the gutter-like cover to the structure. 15. A gutter-like cover having an adhesive surface on its side edge for bonding a structure when laying an optical fiber for strain measurement on a structure to be monitored in order to monitor deformation of the structure. A procedure for inserting the strain measurement optical fiber inside, a procedure for forming a resin layer between the inside of the gutter-shaped cover and the strain measurement optical fiber, and an adhesive inside the remaining gutter-shaped cover excluding the resin layer. A strain measuring optical fiber laying method for integrally fixing a strain measuring optical fiber to a surface of a structure through a filling procedure and a procedure of bonding an adhesive surface provided on a side edge of the gutter-shaped cover to the structure. 16. A step of joining an adhesive surface provided on a side edge of the gutter-shaped cover to a structure prior to a step of filling an adhesive inside the gutter-shaped cover except for a resin layer. Or the method for laying an optical fiber for strain measurement according to any one of the above items 15 or 15. 17. The strain according to claim 15, further comprising a step of joining an adhesive surface provided on a side edge of the gutter-like cover to a structure prior to a procedure of inserting the optical fiber for strain measurement inside the gutter-like cover. Laying optical fiber for measurement. 18. The method for laying an optical fiber for strain measurement according to claim 9, wherein the tension member is covered by the gutter-like cover. 19. The method of laying an optical fiber for strain measurement according to claim 9, wherein the gutter-shaped cover has a built-in tension member.