JP7265428B2 - Adhesion strength evaluation jig, adhesion strength evaluation device, and adhesion strength evaluation method - Google Patents

Description

TECHNICAL FIELD The present invention relates to an adhesion strength evaluation jig, an adhesion strength evaluation apparatus, and an adhesion strength evaluation method.

In irrigation facilities such as water channels for agricultural drainage, the surface of a concrete frame or the like may be worn by running water or the like. In addition, there are cases where repair is required due to deterioration of the concrete frame or the like. For this reason, concrete frames and the like are repaired by covering the surface of the concrete structure with a repair material (covering material) such as a cement-based or polymer-cement-based repair material. For example, a concrete skeleton can be repaired by forming a repair material layer made of a repair material on the surface of the concrete skeleton (see, for example, Patent Document 1 below).

As a method for confirming the secular change of such a repair material layer, the adhesion strength of the repair material layer to the structure is evaluated (for example, see Non-Patent Document 1 below). In this evaluation method, first, after cleaning the surface of a repair material layer formed on a foundation such as a concrete frame, a rectangular jig body is adhered to the surface with an epoxy-based adhesive or the like. After the adhesive is cured, a cutting tool such as a disk grinder is used to form a grid-shaped notch surrounding the jig main body in the repair material layer. Then, a tensile load is applied to the jig body by a connecting shaft connected to the jig body to partially break and separate the repair material layer, and the adhesion strength of the repair material layer can be evaluated based on the tensile load at that time. can.

Japanese Patent No. 2851563

Mori, et al. 4, "Study on performance evaluation of waterway repair method", Rural Engineering Research Institute Technical Report, Rural Engineering Research Institute, No. 210 (2009), p. 203-225

In the conventional evaluation method, when attaching the jig body to, for example, a side wall, it is necessary to temporarily fix the jig body with a tape until the adhesive is cured. However, the temporary fixation with conventional tape tends to cause misalignment due to the weight of the jig body. could not be evaluated.
A method of forming cuts in the repair material layer in advance before attaching the jig body with an adhesive may also be considered. However, even in this case, the same problems arise in the temporary fixation of the jig body, and furthermore, the adhesive may enter the notch and affect the evaluation of the repair material layer.

In view of the above circumstances, the present invention provides an adhesion strength evaluation jig, an adhesion strength evaluation device, and an adhesion strength evaluation method that can evaluate the adhesion strength of a coating material positioned on a wet surface or in a humid environment such as water. One of the purposes is to provide

In order to solve the above problems, the adhesion strength evaluation jig according to the first aspect of the present invention is an evaluation used when evaluating the adhesion strength between a base and a coating material formed on the surface of the base. a jig body having a first surface and a second surface opposite to the first surface, the first surface being attached to the coating material via an organic adhesive; and a central shaft a tubular member extending along the edge of the covering member, the ring member holding the jig body attached to the covering material and being insertable into a ring-shaped ring hole formed in the covering material; It is characterized by

In the above aspect, the ring member includes a cylindrical portion that holds the jig body, and is provided on one side in the axial direction of the cylindrical portion and is insertable into a ring-shaped ring hole formed in the coating material. a projection for preventing an adhesive from entering the ring-shaped ring hole, wherein the radial thickness of the projection is thinner than the radial thickness of the cylindrical portion, and the outer circumference of the cylindrical portion At least part of the surface is preferably located radially outside the outer peripheral surface of the protrusion.

In the above aspect, the surplus of the organic adhesive provided on at least one of the jig main body and the ring member and between the first surface of the jig main body and the coating material is removed from the jig main body by the An adhesive discharging part for discharging to the second surface side is provided, the adhesive discharging part being a groove formed in the inner peripheral surface of the cylindrical part forming a gap between the cylindrical part and the jig main body, It is preferable that the groove portion is a plurality of grooves formed on the inner peripheral surface of the cylindrical portion.

In addition, a device for evaluating adhesion strength according to a second aspect of the present invention includes the jig for evaluating adhesion strength according to the first aspect, and the jig main body attached to the coating material in a direction away from the base. tensioning means for applying a load to separate fragments comprising at least a portion of the dressing.

In addition, the adhesion strength evaluation method according to the third aspect of the present invention includes applying a tensile load in a direction away from the base to the jig body attached to the coating material formed on the surface of the base, An adhesion strength evaluation method for evaluating the adhesion strength of a coating formed on the surface of the substrate using an adhesion strength evaluation device having a tensile means for separating fragments containing at least a portion of the substrate, the method comprising: and an inserting step of inserting a projecting portion provided on one axial side of a ring member having a cylindrical portion for holding a jig body into the ring hole. a pasting step of sticking the jig body to the surface of the coating material by curing an organic adhesive in a state where the jig body is temporarily fixed by the cylindrical portion of the ring member; and an evaluation step of separating fragments containing at least part of the coating material by applying a tensile load in a direction away from the base to the jig body, and evaluating the adhesion strength based on the fragments. Characterized by

According to one aspect of the present invention, there is provided an adhesion strength evaluation jig, an adhesion strength evaluation device, and an adhesion strength evaluation method that can evaluate the adhesion strength of a coating material even on a wet surface or in water.

FIG. 1 is a diagram showing a schematic configuration of an apparatus for adhesion strength evaluation. FIG. 2 is an exploded perspective view of the adhesion evaluation jig. FIG. 3 is a cross-sectional view showing the configuration of the jig body. FIG. 4 is a cross-sectional view showing the configuration of the ring member. FIG. 5A is a process drawing explaining the punching process. FIG. 5B is a process drawing explaining the insertion process. FIG. 5C is a process drawing explaining the sticking process. FIG. 5D is a process chart explaining the evaluation process. FIG. 6 shows a modification of the ring member. FIG. 7 shows a modification of the ring member. FIG. 8 shows a modification of the jig body. FIG. 9A is a diagram showing the process of inserting the ring member using the insertion jig. FIG. 9B is a diagram showing the process of inserting the ring member using the insertion jig. FIG. 9C is a diagram showing the process of inserting the ring member using the insertion jig. FIG. 10 shows a modification of the jig body.

An embodiment of an adhesion strength evaluation jig, an adhesion strength evaluation apparatus, and an evaluation method for evaluating the adhesion strength of a coating material will be described below with reference to the drawings.

In irrigation facilities such as water channels for agricultural drainage, the foundation (concrete frame, etc.) is repaired by forming a repair material layer made of a repair material (covering material) on the surface of the foundation, which is a concrete frame, etc. is being done. Since such a repair material layer may peel off due to water pressure from the back, deterioration of the material over time, poor construction, etc., it is important to conduct periodic evaluation tests of adhesion strength after construction. becomes.

(Apparatus for evaluating adhesion strength)
First, the apparatus for evaluating adhesion strength used for evaluating the adhesion strength of the coating material will be described.
FIG. 1 is a diagram showing a schematic configuration of an apparatus for adhesion strength evaluation.
As shown in FIG. 1, an adhesion strength evaluation apparatus 100 (hereinafter simply referred to as evaluation apparatus 100) includes an adhesion evaluation jig 10 and a tensile tester 40 (tensile means). The evaluation device 100 is a device used to evaluate the strength of adhesion between the base 1 and the repair material layer (covering material) 2 formed on the surface 1a of the base 1 .

The base 1 is, for example, a concrete skeleton such as a waterway to be repaired. The repair material layer 2 is made of a repair material such as inorganic materials such as cement-based (for example, mortar) and polymer-cement-based (for example, polymer cement mortar). The thickness of the repair material layer 2 is, for example, 5-50 mm (preferably 5-20 mm).

FIG. 2 is an exploded perspective view of the adhesion evaluation jig 10. FIG.
As shown in FIG. 2 , the adhesion evaluation jig 10 includes a jig body 11 , a ring member 12 and an adhesive discharge portion 13 . The jig body 11 is attached to a predetermined region on the surface 2a of the repair material layer 2 via an organic adhesive 14, as shown in FIG. The jig main body 11 is attached to a region of the repair material layer 2 surrounded by the ring hole 2H. That is, the area surrounded by the ring hole 2H on the surface 2a of the repair material layer 2 is used as an adhesion strength evaluation area by the evaluation device 100. FIG.

FIG. 3 is a sectional view showing the configuration of the jig body 11. As shown in FIG. As shown in FIG. 3, the jig body 11 includes a base portion 15 and a connecting portion 16. As shown in FIG. The base portion 15 and the connection portion 16 have a circular shape. The connecting portion 16 is provided in the center of the base portion 15 .

The base portion 15 has a back surface (first surface) 15a and a front surface (second surface) 15b. The back surface 15a and the front surface 15b are surfaces facing opposite to each other. The back surface 15 a of the base portion 15 of the jig body 11 is attached to the repair material layer 2 via the organic adhesive 14 . That is, the back surface 15 a functions as an adhesive surface for the jig body 11 . The connecting portion 16 has a female threaded portion 16a, and the female threaded portion 16a is coupled to a coupling shaft 42 of a tensile tester 40, which will be described later (see FIG. 1).

FIG. 4 is a sectional view showing the configuration of the ring member 12. As shown in FIG.
As shown in FIG. 4 , the ring member 12 is a tubular member extending along the central axis O and capable of holding the jig body 11 attached to the repair material layer 2 . The ring member 12 is made of, for example, an elastic material such as rubber or plastic. The ring member 12 has a cylindrical portion 20 that holds the jig body 11 and a ring-shaped protruding portion 21 integrally provided with the cylindrical portion 20 . The centers of the cylindrical portion 20 and the projecting portion 21 are aligned with the central axis O. As shown in FIG.

The inner diameter of the cylindrical portion 20 is equal to or slightly smaller than the outer diameter of the base portion 15 of the jig body 11 . Therefore, the jig main body 11 (base portion 15) can be fitted into and held by the cylindrical portion 20. As shown in FIG. A central axis O of the ring member 12 coincides with the center of the jig main body 11 held by the cylindrical portion 20 . In this embodiment, the end of the inner surface of the cylindrical portion 20 on the other side in the axial direction (the upper side in FIG. 4) is chamfered.

The protruding portion 21 is provided on one axial side (lower side in FIG. 4) of the cylindrical portion 20 . The projecting portion 21 is a portion that is inserted into a ring-shaped ring hole 2H (see FIG. 1) formed in the repair material layer 2 . The radial thickness of the protrusion 21 is equal to or slightly smaller than the radial width of the ring hole 2H. The inner diameter of the projecting portion 21 (the diameter of the inner peripheral surface 21a) is slightly smaller than the inner diameter of the ring hole 2H. Therefore, the inner peripheral surface 21a of the projecting portion 21 can be in good contact with the inner peripheral surface 2H1 positioned radially inward of the ring hole 2H (see FIG. 1).

In this embodiment, the inner peripheral surface 20a of the cylindrical portion 20 and the inner peripheral surface 21a of the projecting portion 21 are flush with each other. Moreover, the radial thickness of the projecting portion 21 is smaller than the radial thickness of the cylindrical portion 20 . That is, the outer peripheral surface 20b of the cylindrical portion 20 is located radially outside the outer peripheral surface 21b of the projecting portion 21 . As a result, the lower end 20c of the cylindrical portion 20 on one side in the axial direction (lower side in FIG. 4) can come into contact with the surface 2a of the repair material layer 2 when the projecting portion 21 is inserted into the ring hole 2H. (See Figure 1).

The cylindrical portion 20 has a plurality of grooves 22a formed in the inner peripheral surface 20a. A plurality of grooves 22a are provided along the circumferential direction of the inner peripheral surface 20a. Each groove 22a is formed on the inner peripheral surface 20a such that the lower end portion 21a1 reaches the inner peripheral surface 21a of the projecting portion 21. As shown in FIG.

The adhesive discharge part 13 has a function of discharging the surplus organic adhesive 14 provided between the back surface 15 a of the jig body 11 (base part 15 ) and the repair material layer 2 to the front surface 15 b side of the jig body 11 . have. The adhesive discharge part 13 is provided on at least one of the jig main body 11 and the ring member 12 . The adhesive discharge portion 13 is configured by a gap between the cylindrical portion 20 and the jig main body 11 . In this embodiment, the adhesive discharge portion 13 is a groove portion 22 formed in the inner peripheral surface 20a of the cylindrical portion 20, as shown in FIG. The groove portion 22 is a plurality of grooves 22a formed in the inner peripheral surface 20a of the cylindrical portion 20 described above.

As shown in FIG. 1 , the tensile tester 40 includes a testing machine body 41 provided with a connecting shaft 42 , a plurality of legs 43 provided on the testing machine body 41 , and a A driving unit 45 and a data processing unit 46 are provided.

The testing machine main body 41 has, for example, a hydraulic cylinder (shaft moving mechanism). The drive unit 45 can move the connecting shaft 42 in the longitudinal direction by operating the hydraulic cylinder of the testing machine main body 41 by rotating the rotary handle 47 . The connecting shaft 42 is connected by being screwed into the female screw portion 16 a of the connecting portion 16 of the jig body 11 . The data processing section 46 includes a display section (not shown) for displaying the tensile load.

(Adhesion strength evaluation method)
Next, the adhesion strength evaluation method of this embodiment for evaluating the adhesion strength of the repair material layer 2 formed on the surface 1a of the substrate 1 using the evaluation device 100 will be described.
The adhesion strength evaluation method of the repair material layer 2 of the present embodiment (hereinafter simply referred to as the evaluation method) has a perforation step, an insertion step, an affixing step, and an evaluation step. Each step will be described below.

(Drilling process)
FIG. 5A is a process drawing explaining the punching process. As shown in FIG. 5A , in the drilling step, a ring-shaped ring hole 2H is formed in the repair material layer 2 by using a core drill 25 . As the core drill 25, a drill having dimensions corresponding to the adhesion evaluation jig 10 used for evaluation is selected from among a plurality of drills having various outer diameter dimensions.

The ring hole 2</b>H is formed with a depth reaching the underlayer 1 . For example, by marking the outer peripheral surface of the core drill 25 with a tape, a pen, or the like, it becomes easy to manage the depth during construction. In this way, the drilling process using the core drill 25 eliminates the trouble of adjusting the angle of the blade and the depth of cut to be constant as in the case of using a conventional disc grinder, so the drilling depth can be easily managed.

Here, when using a conventional disc grinder to form cross-shaped cuts surrounding a rectangular jig main body, there is a possibility that the size of the cuts may vary due to differences in the skill of the operator. On the other hand, according to the drilling process of the present embodiment, the area of the adhesion strength evaluation region for evaluating the adhesion strength depends on the outer diameter of the core drill 25, so variations among operators can be greatly reduced. Therefore, highly reliable evaluation can be performed.

Moreover, according to the perforating process of this embodiment, the amount of scattering of dust can be reduced compared with the case where a disc grinder is used. Further, according to the drilling process of the present embodiment, the blade rotating at high speed like a disk grinder does not harm the worker, and the drilling work can be performed more safely.

Subsequently, the area surrounded by the ring hole 2H on the surface 2a of the repair material layer 2, that is, the area where the jig main body 11 is attached (adhesion strength evaluation area) is cleaned by surface polishing to remove chips. Remove. According to the perforating process of the present embodiment, since the range of surface polishing is circular, the polishing range becomes clear.

In the ring hole 2H, chips of the repair material layer 2 generated in the drilling process by the core drill 25 and chips of the repair material layer 2 entering in the cleaning process are sucked and removed by a suction device (not shown). You may Thereby, the inside of the ring hole 2H can be cleaned.

(Insertion process)
FIG. 5B is a process drawing explaining the insertion process. As shown in FIG. 5B, in the inserting step, the projecting portion 21 of the ring member 12 is inserted into the ring hole 2H. The ring member 12 is manually inserted into the ring hole 2H by the operator.

When inserting the ring member 12 into the ring hole 2H, an insertion jig 30 or the like shown in FIGS. 9A to 9C, which can press the ring member 12 into the ring hole 2H, may be used.

In the ring member 12 of this embodiment, the inner diameter of the projecting portion 21 (the diameter of the inner peripheral surface 21a) is slightly smaller than the inner diameter of the ring hole 2H. As a result, the protruding portion 21 is inserted into the ring hole 2H with its inner diameter expanded, so that the inner peripheral surface 21a of the protruding portion 21 is in good contact with the inner peripheral surface 2H1 positioned radially inward of the ring hole 2H. state. Therefore, the ring member 12 is reliably fixed to the repair material layer 2 . The central axis O of the ring member 12 fixed to the repair material layer 2 coincides with the center of the ring hole 2H.

In the ring member 12 of the present embodiment, the outer peripheral surface 20b of the cylindrical portion 20 is located radially outside the outer peripheral surface 21b of the projecting portion 21 . Therefore, the lower end portion 20c on one side in the axial direction of the cylindrical portion 20 contacts the surface 2a of the repair material layer 2 . Since the lower end portion 20c abuts the surface 2a of the repair material layer 2 in this way, it is possible to easily determine the state in which the entire axial direction of the projecting portion 21 is inserted into the ring hole 2H. Therefore, the entire ring member 12 can be reliably inserted into the ring hole 2H.

(Paste process)
FIG. 5C is a process drawing explaining the sticking process. For convenience of explanation, FIG. 5C shows a cross section passing through the adhesive discharge portion 13, unlike FIG. 5B.
As shown in FIG. 5C , in the pasting step, a repair material layer 2 is formed by surrounding a jig body 11 with an organic adhesive 14 containing a resin such as epoxy on the back surface 15 a of a base portion 15 with a ring member 12 . affixed to the surface 2a of the

When attaching the jig body 11 to the repair material layer 2 , the jig body 11 (base portion 15 ) is held in a state of being fitted in the cylindrical portion 20 by pressing the jig body 11 against the surface 2 a of the repair material layer 2 . be. When the jig main body 11 is pressed against the repair material layer 2 , the surplus 14 a of the organic adhesive 14 protrudes from between the back surface 15 a of the base portion 15 and the surface 2 a of the repair material layer 2 . Surplus portion 14a of organic adhesive 14 protruding from between back surface 15a and front surface 2a passes through groove portion 22 (plurality of grooves 22a) provided in inner peripheral surface 20a of ring member 12 (cylindrical portion 20). It is discharged to the surface 15 b side of the jig main body 11 . That is, in the present embodiment, the groove portion 22 functions as the adhesive discharge portion 13 for discharging the surplus portion 14a of the organic adhesive 14 toward the surface 15b of the jig main body 11 .

Then, the jig main body 11 is attached to the surface 2 a of the repair material layer 2 by curing the organic adhesive 14 . Note that the ring member 12 is adhered to the jig main body 11 with an organic adhesive 14 .

In the adhesion evaluation jig 10 of this embodiment, the central axis O of the ring member 12 coincides with the center of the jig main body 11 held by the cylindrical portion 20, and the central axis O of the ring member 12 coincides with the center of the ring hole 2H. do. Therefore, the center of the jig main body 11 coincides with the center of the ring hole 2H. In other words, the center of the jig body 11 coincides with the center of the area (adhesion strength evaluation area) surrounded by the ring hole 2H where the jig body 11 is attached. According to the affixing process of this embodiment, the center position of the adhesion strength evaluation area and the center position of the jig main body 11 can be aligned, so the reliability of the evaluation process described below can be improved.

Here, if the surplus 14a of the organic adhesive 14 enters the underlayer 1 side, the adhesion strength of the organic adhesive 14 may affect the evaluation of adhesion strength. In contrast, according to the bonding process of the present embodiment, the inner peripheral surface 21a of the protruding portion 21 is in a state of being in good contact with the inner peripheral surface 2H1 of the ring hole 2H as described above. Excess 14a of adhesive 14 is prevented from entering the gap between projecting portion 21 and ring hole 2H. As a result, the surplus portion 14a of the organic adhesive 14 can be prevented from entering the underlayer 1 through the ring hole 2H.

As described above, according to the affixing process of the present embodiment, the surplus portion 14a of the organic adhesive 14 is applied to a region (the surface 15b side of the jig main body 11 opposite to the substrate 1) that does not affect the evaluation of the adhesion strength. can escape to Therefore, the evaluation process described later can be performed without performing the removal operation for removing the surplus portion 14a of the organic adhesive 14. FIG.

According to the attaching step of the present embodiment, the jig body 11 can be attached to the surface 2 a of the repair material layer 2 by curing the organic adhesive 14 while the jig body 11 is held by the ring member 12 . . That is, the jig main body 11 is temporarily fixed to the ring member 12 until the organic adhesive 14 hardens. Since the jig body 11 is held by the ring member 12 fixed to the repair material layer 2, the jig body 11 can be temporarily fixed in a stable state even if the jig body 11 is attached to the side wall of the water channel.

(Evaluation process)
FIG. 5D is a process chart explaining the evaluation process. As shown in FIG. 5D , in the evaluation step, the tensile tester 40 applies a tensile load to the jig body 11 in the direction away from the base 1 to evaluate the bond strength.

Specifically, the tensile tester 40 is installed so as to abut on the area surrounding the adhesion evaluation jig 10 on the surface 2a of the repair material layer 2, and the connecting shaft 42 is connected to the connection portion 16 (female screw portion 16a) of the jig body 11. Link. By rotating the rotating handle 47 to operate the hydraulic cylinder of the testing machine main body 41 , the connecting shaft 42 is lifted and a tensile load is applied to the jig main body 11 in the direction away from the substrate 1 .

Since the surface 2a of the repair material layer 2 to which the jig body 11 is attached is separated by the ring hole 2H, the range of the repair material layer 2 to which the tensile load is applied is limited to the range exposed inside the ring hole 2H. Since the range of the repair material layer 2 to which the tensile load is applied is thus limited within the ring hole 2H, based on the measured value of the tensile load applied to the repair material layer 2 and the area surrounded by the ring hole 2H, The adhesion strength of the repair material layer 2 can be calculated. The unit of adhesion strength is, for example, N/mm ² .

The tensile load applied to the jig main body 11 is gradually increased to separate the fragments 48 including at least part of the repair material layer 2 from the other parts. Since the ring member 12 is attached to the jig main body 11 with the organic adhesive 14 , the ring member 12 is separated from the repair material layer 2 together with the jig main body 11 and the fragments 48 .

According to the evaluation process of this embodiment, the adhesive strength of the repair material layer 2 to the base 1 can be evaluated based on the fragment 48 and the tensile load. The surface 2a of the repair material layer 2 is flattened by filling the cylindrical holes formed in the surface 2a of the repair material layer 2 with the repair material.

Here, in the case of the conventional evaluation method of forming a grid-shaped cut with a disc grinder, when repairing the repair material layer after evaluation, it is necessary to fill the grid-shaped cut portion (a gap of about 3 mm to 5 mm) with the repair material. Therefore, the repair work becomes complicated. On the other hand, according to the adhesion strength evaluation method of the present embodiment, when repairing the repair material layer 2 , the repair material layer 2 can be repaired easily because the repair material can be filled into the cylindrical holes.

As described above, according to the adhesion strength evaluation method of the present embodiment, the jig body 11 can be temporarily fixed by the ring member 12 until the organic adhesive 14 hardens. As a result, the jig main body 11 can be attached even to a place where it is difficult to temporarily fix with a tape, such as a side wall of a channel. In addition, by temporarily fixing the jig body 11 with the ring member 12, the jig body 11 can be applied to the surface 2a of the repair material layer 2 located in a humid environment such as a wet surface where the adhesive force of the tape is not sufficiently obtained or in a humid environment such as underwater. can be firmly fixed.
Therefore, according to the adhesion strength evaluation method of the present embodiment, the adhesion strength of the repair material layer 2 to the substrate 1 can be evaluated even on a wet surface or in water.
Further, according to the adhesion strength evaluation method of the present embodiment, the jig main body 11 attached to the repair material layer 2 is held, and the ring member 12 is inserted into the ring-shaped ring hole 2H formed in the repair material layer 2. is inserted, it is possible to prevent the surplus portion 14a of the organic adhesive 14 from entering the ring hole 2H.

It should be noted that when the conventional fixing by tape is used, it is not possible to evaluate a portion located in a humid environment such as a wet surface or in water as described above. For this reason, it was necessary to take measures such as installing a temporary waterway to divert water so that water would not flow into the part to be evaluated in the waterway, or installing a roof for rainy weather to prevent rainwater from flowing in. In addition, since the installation of temporary waterways and roofs for rainy weather increases the cost, it is conceivable to evaluate the adhesion strength only at positions higher than the water level of the waterway. However, the reliability of the evaluation results is reduced because the evaluation is based on a specific site.

According to the adhesion strength evaluation method of the present embodiment, the adhesion strength of the repair material layer 2 to the substrate 1 can be evaluated even on a wet surface or in water without installing a temporary waterway or a roof for rainy weather. High evaluation results can be obtained.

Further, according to the adhesion evaluation jig 10 of the present embodiment, the jig main body 11 can be temporarily fixed by the ring member 12 until the organic adhesive 14 is cured. The jig body 11 can be firmly fixed to the surface 2a of the repair material layer 2 located in a humid environment such as underwater. The adhesion evaluation jig 10 holds the jig main body 11 attached to the repair material layer 2 and has a ring member 12 that can be inserted into the ring-shaped ring hole 2H formed in the repair material layer 2. , the surplus portion 14a of the organic adhesive 14 can be prevented from entering the ring hole 2H.

Further, according to the evaluation apparatus 100 of the present embodiment, since the adhesion evaluation jig 10 is provided, the adhesion strength of the repair material layer 2 to the substrate 1 can be evaluated even on a wet surface or in water.

Although the embodiments of the present invention have been described above, the configurations in the embodiments are only examples, and additions, omissions, substitutions, and other modifications of the configuration are possible without departing from the scope of the present invention.

The shapes of the jig body and the ring member that constitute the adhesion evaluation jig are not limited to the examples shown in the above embodiments.
FIG. 6 is a side view of a ring member 112 according to a modification of the ring member. In FIG. 6, the cross-sectional configuration is shown by cutting out part of the ring member 112 .
As shown in FIG. 6 , the ring member 112 has a cylindrical portion 120 and a ring-shaped protruding portion 121 provided integrally with the cylindrical portion 120 . The outer peripheral surface 120b of the cylindrical portion 120 and the outer peripheral surface 121b of the projecting portion 121 are flush with each other. Moreover, the radial thickness of the projecting portion 121 is greater than the radial thickness of the cylindrical portion 120 . That is, the cylindrical portion 120 has relatively lower strength than the projecting portion 121 and is easily deformed. In addition, the cylindrical portion 120 has a ring-shaped projection 122 at the end on the projecting portion 121 side, the outer peripheral surface 120b of which is located radially outside the outer peripheral surface 121b of the projecting portion 121 . The ring-shaped projection 122 is a portion that comes into contact with the surface 2a of the repair material layer 2 when the projection 121 is inserted into the ring hole 2H.

According to the ring member 112 shown in FIG. 6, the thickness of the cylindrical portion 120 in the radial direction is reduced to facilitate deformation. and the surface 2a of the repair material layer 2 (see FIG. 5C), the cylindrical portion 120 is deformed so as to expand radially outward. As a result, the surplus portion 14a of the organic adhesive 14 passes through the gap formed between the inner peripheral surface 20a of the ring member 112 (cylindrical portion 120) and the outer peripheral surface of the jig body 11, and passes through the surface 15b of the jig body 11. It will be discharged to the side. That is, in the ring member 112 shown in FIG. 6, the cylindrical portion 120 functions as an adhesive discharging portion for discharging the surplus portion 14a of the organic adhesive 14 toward the surface 15b of the jig body 11. As shown in FIG. According to the ring member 112 shown in FIG. 6, the adhesive discharge portion can be configured by reducing the thickness of the cylindrical portion 120 instead of the groove portion 22 of the above embodiment.

FIG. 7 is a cross-sectional view of a ring member 12A according to a modification of the ring member.
As shown in FIG. 7, in the ring member 12A, the radial thickness of the cylindrical portion 20 differs in the axial direction. Specifically, the cylindrical portion 20 has a tapered shape in which the radial thickness decreases from one axial side (lower side in FIG. 7) toward the other axial side (upper side in FIG. 7). According to this configuration, it is possible to improve the insertability of the jig body 11 into the ring member 12A.

Moreover, the projecting portion 21 has a tapered shape in which the thickness in the radial direction decreases from the other axial side (upper side in FIG. 7) toward the one axial side (lower side in FIG. 7). According to this configuration, it is possible to improve the insertability of the projecting portion 21 into the ring hole 2H.

FIG. 8 is a diagram showing the configuration of a jig body 11A according to a modification of the jig body. 9A to 9C are diagrams showing the process of inserting the ring member 12B into the ring hole 2H.

As shown in FIG. 8, the jig main body 11A has a plurality of plane portions 17 on the outer peripheral surface of a circular base portion 15. As shown in FIG. A plurality of planar portions 17 are provided along the circumferential direction of the base portion 15 . According to the jig main body 11A, as shown in FIG. 8, a cylindrical ring member 12B without grooves or protrusions can be combined.

According to the jig main body 11A, gaps are formed between the plurality of flat portions 17 and the inner peripheral surface 12B1 of the ring member 12B. It functions as an adhesive discharge part to be discharged.

When using the ring member 12B shown in FIG. 8, an insertion jig 30 shown in FIGS. 9A to 9C may be used. As shown in FIG. 9A, the insertion jig 30 is a jig that expands the inner diameter of the ring member 12B to improve insertability into the ring hole 2H. The insertion jig 30 includes a grasping portion 31 and a convex portion 32 . The grasping portion 31 is a portion grasped by an operator who performs the insertion work. The ring member 12B is attached to the outer peripheral surface of the projection 32. As shown in FIG. The upper end portion 12B2 of the ring member 12B is in contact with the lower surface 31a of the grip portion 31. As shown in FIG.

With the ring member 12B and the ring hole 2H aligned, as shown in FIG. The ring member 12B is inserted into the ring hole 2H by 31a.

After inserting the ring member 12B, the projection 32 and the ring member 12B are separated from each other by pulling up the insertion jig 30 while holding the holding portion 31 as shown in FIG. 9C.
By using such an insertion jig 30, the cylindrical ring member 12B can be easily inserted into the ring hole 2H.

FIG. 10 is a diagram showing the configuration of a jig body 11B according to a modification of the jig body.
As shown in FIG. 10, the jig main body 11B has a protruding portion 18 that protrudes radially outward on the other axial side (upper side in FIG. 10) of the circular base portion 15 . The projecting portion 18 has a substantially circular shape in plan view, and a plurality of planar portions 18a are formed along the circumferential direction. That is, the outer shape of the protruding portion 18 is circular except for the flat portion 18a, and is linear at the flat portion 18a. The jig body 11B is used in combination with the cylindrical ring member 12B shown in FIG.

The protruding portion 18 abuts on the ring member 12B at a portion other than the flat portion 18a, and a gap is formed between the flat portion 18a and the inner peripheral surface of the ring member 12B. According to such a jig body 11B, a gap can be formed between the plurality of flat portions 18a and the inner peripheral surface of the ring member. It can be made to function as an adhesive discharging portion that discharges to the surface side of 11B (the upper surface side of the projecting portion 18).

In addition, the object to be evaluated in the adhesion strength evaluation method of the present invention is not limited to the base 1 and the repair material layer 2 described above, but the adhesion strength between the base and the coating material that covers the surface of the base. There are no particular restrictions on the two materials as long as they are used.
The structure to be repaired is not particularly limited, and includes structures constructed by civil engineering technology, building technology, and the like. Structures include, for example, underground tunnels, underground passages, culverts, abutments, retaining walls, breakwaters, protective walls, and the like.

DESCRIPTION OF SYMBOLS 1... Base 1a, 2a, 15b... Surface 2... Repair material layer (coating material) 2H... Ring hole 11, 11A, 11B... Jig main body, 12, 12A, 12B, 112... Ring member, 13... Adhesion Agent discharging portion 14 Organic adhesive 14a Surplus 17, 22a Groove 18, 21, 121 Projection 20, 120 Cylindrical portion 20a, 21a, 2H1 Inner peripheral surface 20b, 21b, 120b, 121b... Peripheral surface 22... Grooves 48... Fragments 100... Apparatus for evaluation O... Central axis.

Claims (5)

An evaluation jig used for evaluating adhesion strength between a base and a coating material formed on the surface of the base,
a jig body having a first surface and a second surface facing opposite to the first surface, the first surface being attached to the coating material via an organic adhesive;
a cylindrical member extending along the central axis, holding the jig body attached to the covering material and insertable into a ring-shaped ring hole formed in the covering material; Jig for adhesion strength evaluation. The ring member is
a cylindrical portion that holds the jig body;
a protruding portion provided on one side in the axial direction of the cylindrical portion, capable of being inserted into a ring-shaped ring hole formed in the covering material, and preventing an organic adhesive from entering the ring-shaped ring hole; have
the radial thickness of the projecting portion is thinner than the radial thickness of the cylindrical portion;
2. The attachment strength evaluation jig according to claim 1, wherein at least a part of the outer peripheral surface of the cylindrical portion is located radially outside the outer peripheral surface of the projecting portion. The surplus of the organic adhesive provided on at least one of the jig main body and the ring member and between the first surface of the jig main body and the coating material is applied to the second surface side of the jig main body. Equipped with an adhesive discharge unit that discharges to
The adhesive discharge portion is a groove portion formed in the inner peripheral surface of the cylindrical portion forming a gap between the cylindrical portion and the jig main body,
The attachment strength evaluation jig according to claim 2 , wherein the groove portion is a plurality of grooves formed on the inner peripheral surface of the cylindrical portion. A jig for evaluating adhesion strength according to any one of claims 1 to 3;
a tensile means for applying a tensile load in a direction away from the base to the jig body attached to the coating material to separate fragments containing at least part of the coating material. Adhesion strength evaluation provided with tensile means for applying a tensile load in a direction away from the substrate to the jig body attached to the coating material formed on the surface of the substrate and separating fragments containing at least part of the coating material. An adhesion strength evaluation method for evaluating the adhesion strength of a coating material formed on the surface of the base using an apparatus,
A perforation step of forming a ring-shaped ring hole in the covering material to reach the base;
an inserting step of inserting a projecting portion provided on one side in the axial direction of a ring member having a cylindrical portion for holding a jig main body into the ring hole;
an attaching step of attaching the jig body to the surface of the coating material by curing an organic adhesive in a state where the jig body is temporarily fixed by the cylindrical portion of the ring member;
an evaluation step of evaluating the adhesion strength by applying a tensile load in a direction away from the base to the jig body by the tension means.

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