JP2018188557A - Adhesive injection method and adhesive - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an adhesive injection method for injecting an adhesive between a structure and a reinforcement material and adhesive integrating them, capable of being conducted even in ultra low temperature environment at -25°C or lower, and the adhesive used in the injection method.SOLUTION: In an adhesive injection method for injecting an adhesive between a structure and a reinforcement material for reinforcement of the structure and adhesive integrating them, following processes are executed: an ordinary temperature A liquid generation process for stirring mixing a main agent and a curing agent to generate an A liquid containing them under an ordinary temperature environment at 0°C or higher; an ultra low temperature adhesive generation process for mixing the A liquid generated in the previous process and a B liquid containing an accelerator under ultra low temperature environment at -25°C or lower to generate the adhesive having viscosity under the ultra low temperature environment of 3000 mPa s or lower; and an ultra low temperature adhesive injection process for injecting the adhesive generated in the previous process between the structure and the reinforcement material by an injection device such as a pump or a squeeze pump under the ultra low temperature environment.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an adhesive injection method for injecting an adhesive between a structure and a reinforcing material when the reinforcing material such as a steel material or a fiber sheet is fixed to a structure such as a reinforced concrete structure and the injection method. It is related with the adhesive agent used for.

  Conventionally, in order to reinforce an aged structure or to provide seismic reinforcement, a reinforcing material is fixed to the structure. Various methods have been proposed for fixing a reinforcing material to a structure, such as injecting grout between the structure and the reinforcing material, but a method of injecting and fixing an adhesive between the structure and the reinforcing material. It has been known.

  For example, in Patent Document 1, when filling an adhesive or the like between the upper surface of the floor slab and the attached steel plate, a steel plate is placed on the lower surface of the floor slab in order to maintain a certain distance between the upper surface of the floor slab and the steel plate. After mounting, filling the space between the bottom of the slab and the steel plate, insert the height adjustment bolt into the bolt insertion hole drilled in the floor slab, and the bolt insertion hole drilled in the steel plate attached to the bottom of the floor slab The concrete floor is fixed by using and adjusting the height of the high-strength and high-nut, and then attaching the steel plate to the top of the floor slab and inserting the bolts into the bolt insertion holes and high-strength high nut of the steel plate and tightening them. A plate steel plate sandwich reinforcing method is disclosed (see claim 1 of patent document 1, paragraphs [0016] to [0023] of the specification, FIGS. 1 to 7 of the drawings, etc.).

  However, the steel plate sandwich reinforcement method for concrete floor slabs described in Patent Document 1 is a reinforcement method at room temperature, and there is a problem that the construction cannot be performed in a low temperature environment, for example, below -25 ° C., which is below freezing.

  Patent Document 2 includes a specific heterocycle-containing compound (A), a polyepoxide (B), and a compound (C) that generates a primary and / or secondary amino group by reaction with water. A concrete structure repair injection agent is disclosed (see claim 1 of patent document 2 and paragraphs [0007] to [0061] of the specification).

  However, the repair injecting agent for a concrete structure described in Patent Document 2 solves the problem that it is difficult to harden at 5 ° C. or lower, and its curing temperature is −10 ° C. or higher (specification of Patent Document 2). (See paragraph [0060] of the book). For this reason, in the low temperature environment used as -25 degrees C or less, the problem that the reinforcement | strengthening construction of a structure cannot be performed has not been solved.

  As described above, in an extremely low temperature environment of -25 ° C. or less, which is well below the freezing point, there is a problem that the structure cannot be reinforced because most of the solvent becomes solid and cannot be used. Therefore, an adhesive injection method that can be applied even in a cryogenic environment in an adhesive injection method in which an adhesive is injected between a structure and a reinforcing material, and the two are bonded and integrated, and an adhesive used in the injection method Was anxious.

Japanese Patent Laid-Open No. 11-323842 JP 2001-40331 A

  Therefore, the present invention has been devised in view of the above problems, and its object is to provide an adhesive between a structure and a reinforcing material that can be constructed even in a cryogenic environment of −25 ° C. or lower. It is an object to provide an adhesive injection method for injecting and integrating the adhesive and an adhesive used in the injection method.

  The adhesive injection method according to the first invention is an adhesive injection method in which a structure and a reinforcing material for reinforcing the structure are bonded and integrated by injecting an adhesive between them. The agent comprises a main agent composed of an acrylic resin, a curing agent that cures the main agent, and an accelerator that accelerates the reaction of the curing agent, and the main agent and the curing agent in a normal temperature environment of 0 ° C. or higher. A normal temperature A liquid production step for producing an A liquid containing these by stirring and mixing, and the A liquid produced in the previous step and the accelerator in a cryogenic environment of -25 ° C. or lower. Liquid B is mixed to produce the adhesive having a viscosity of 3000 mPa · s or less in the cryogenic environment, and the cryogenic environment produced in the previous step in the cryogenic environment. Adhesives such as pumps and squeeze pumps Characterized in that it comprises a cryogenic adhesive injection step of injecting between the reinforcing material and the structure at input device.

  The adhesive injection method according to a second aspect of the present invention, in the first aspect, promotes the reaction of the main agent made of acrylic resin, the curing agent for curing the main agent, and the curing agent before the cryogenic adhesive injection step. A sealing step of sealing the periphery between the structure and the reinforcing material so that the adhesive does not leak under the cryogenic environment using a sealing adhesive containing an accelerator. It is characterized by.

  In the first or second invention, the adhesive injection method according to the third aspect of the invention is the mixture of the main part and the accelerator containing the main ingredient and the accelerator as the B part in the cryogenic adhesive production step. It is characterized by making it.

  The adhesive injection method according to a fourth invention is the invention according to any one of the first to third inventions, wherein the cryogenic adhesive generation step includes the cryogenic adhesive generation step in the cryogenic environment. The main agent is mixed with fine aggregate so that the curing shrinkage of the adhesive is 3% or less.

  An adhesive according to a fifth aspect of the present invention is an adhesive used in the adhesive injection method according to any one of claims 1 to 4, wherein the main agent is an acrylic resin, a curing agent that cures the main agent, and this curing. And an accelerator for promoting the reaction of the agent, wherein the viscosity under the cryogenic environment is 3000 mPa · s or less, and the cure shrinkage under the cryogenic environment is 3% or less.

In the fifth invention, the adhesive according to the sixth invention has a compressive strength of 60 N / mm ² or more, a shear strength of 10 N / mm ² or more, and a tensile strength of 20 N / mm ² or more in the cryogenic environment. It is characterized by.

  According to the first to sixth inventions, an adhesive that is bonded and integrated by injecting an adhesive between the structure and the reinforcing material only by dissolving only the hardener that is difficult to dissolve in powder into the main agent at room temperature. Construction is possible even in a cryogenic environment where the injection method is -25 ° C or lower, for example, about -30 ° C. For this reason, a structure and a reinforcing material can be reliably integrated and reinforced even in a cryogenic environment. Further, at this time, it is not necessary to heat the entire structure only by heating only when the liquid A is generated, and it is possible to save energy and reduce the construction cost for the reinforcement work of the structure.

  In particular, according to the second aspect, since the sealing step is included, the adhesive can be injected between the structure and the reinforcing material without leakage of the low viscosity adhesive for injection. For this reason, the structure can be reliably reinforced even in a cryogenic environment.

  In particular, according to the third invention, since the adhesive containing the main agent and the accelerator is mixed with the A liquid as the B liquid, the main agent, the curing agent and the accelerator can be combined in a short time even in a cryogenic environment. Can be mixed evenly. For this reason, the quality of the adhesive is stable even in a severe cryogenic environment, and the structure and the reinforcing material can be reliably integrated and reinforced.

  In particular, according to the fourth invention, since the curing shrinkage rate of the adhesive is 3% or less in an extremely low temperature environment, the structure having an acrylic resin having a high cure shrinkage rate as a main agent without generating voids. The object and the reinforcing material can be reliably integrated and reinforced.

  In particular, according to the fifth aspect of the invention, it is possible to provide an adhesive for an injection bonding method that can be constructed even in an extremely low temperature environment of about −30 ° C.

  In particular, according to the sixth invention, the required strength in a cryogenic environment can be ensured, and the structure and the reinforcing material can be reliably integrated and reinforced.

It is a vertical sectional view which shows the clearance gap which inject | pours an adhesive agent with the adhesive agent injection construction method which concerns on embodiment of this invention. It is a flowchart which shows each process of the adhesive agent injection construction method same as the above. It is process explanatory drawing which shows the sealing process of the adhesive agent injection construction method same as the above. It is process explanatory drawing which shows the sealing process of the adhesive agent injection construction method same as the above. It is a photograph which shows the vertical cross section of a specimen.

  Hereinafter, an adhesive injection method according to an embodiment of the present invention and an adhesive used in the injection method will be described with reference to the drawings.

[adhesive]
First, an adhesive used for an injection method according to an embodiment of the present invention described later will be described.

  In an injection method according to an embodiment of the present invention, an adhesive for injection injected into a gap between a structure and a reinforcing material, and a seal for sealing to prevent leakage of the adhesive for injection from the gap Two types of adhesives are used. These adhesives preferably have substantially the same components and the same required strength so that the adhesiveness between the two is good and the skin does not separate at the interface, and the viscosity is adjusted according to the application.

  The adhesive according to the embodiment of the present invention is composed of a main agent made of acrylic resin, a curing agent that cures the main agent, an accelerator that accelerates the reaction of the curing agent, and the like, both for injection and for sealing. This is a three-component reaction curable resin.

(Main agent)
The main agent is a resin based on an acrylic radical curable resin, and a material having a very low viscosity property is selected so that it can be injected even in an extremely low temperature environment of −25 ° C. or lower. This is because the use of an acrylic resin that is generally excellent in curability at a low temperature overcomes the drawback that the epoxy resin known as a conventional adhesive for injection deteriorates in curability at 0 ° C. or lower.

  However, acrylic resins that are generally excellent in curability at low temperatures also have problems in that their viscosity increases at low temperatures and that their curing shrinkage is higher than that of epoxy resins, resulting in voids and insufficient strength. Therefore, in the adhesive according to this embodiment, an acrylic resin having a low viscosity is adopted, and a fine aggregate is added to the main agent at a predetermined ratio (for example, about 10% by weight with respect to the main agent). It was. As a result, the curing shrinkage rate of the injecting adhesive in a cryogenic environment was reduced, and a curing shrinkage rate of 3% or less was achieved as described later.

(Fine aggregate)
In the adhesive according to the present embodiment, a fine aggregate is included as a filler (filler) to reduce the curing shrinkage rate. In the adhesive according to the present embodiment, talc mainly composed of hydrous magnesium silicate composed of inorganic powder obtained by finely pulverizing ore called talc is used as the fine aggregate. Of course, the fine aggregate is not limited to the exemplified talc, and any inorganic fine particle component capable of adjusting the viscosity can be used as appropriate. However, by including a predetermined amount of talc as a fine aggregate in the adhesive, it is possible to simultaneously achieve both goals that are in a trade-off relationship between lowering the viscosity and reducing the shrinkage of curing in an extremely low temperature environment.

(Curing agent)
In the adhesive according to the present embodiment, an organic peroxide such as benzoyl peroxide is employed as a curing agent for initiating a radical reaction. Examples of other compounds that can be used as the curing agent include methyl ethyl ketone peroxide.

  In the adhesive according to the present embodiment, the curing agent is blended at a ratio of 0.5% to 10.0% with respect to the weight of the main agent.

(Accelerator)
In the adhesive according to the present embodiment, an amine compound is employed as an accelerator. Examples of other compounds that can be used as the accelerator include methyl ethyl ketone oxime.

  Moreover, in the adhesive which concerns on this embodiment, the promoter is mix | blended in the ratio of 0.5%-8.0% with respect to the weight of a main ingredient.

  In addition, in the adhesive according to this embodiment, if necessary, in addition to the above-mentioned components, stabilizers such as antioxidants and light stabilizers, antistatic agents, modifiers such as plasticizers and flame retardants, etc. It goes without saying that various additives may be added.

<Physical properties of adhesive>
Next, physical properties of the adhesive according to this embodiment will be described. About two types of adhesives, the above-mentioned adhesive for injection and adhesive for sealing, viscosity (mPa · s) at −25 ° C., compressive strength (N / mm ² ), shear strength (N / mm ² ), and tensile The strength (N / mm ² ) was measured and summarized in the following table.

As shown in Table 1, the two types of adhesives according to the present embodiment have a compressive strength of 60 (N / N), which is a physical property of the adhesive required for the adhesive injection method described later even in an extremely low temperature environment of −25 ° C. mm ² ), shear strength 10 (N / mm ² ), and tensile strength 20 (N / mm ² ) or more. In addition, the adhesive for injection achieves not only the strength but also a viscosity of 3000 (mPa · s) or less, more preferably 1500 (mPa · s) or less, which is necessary for injection.

  In addition, based on JIS A6024, which is a standard for injecting epoxy resin for repairing buildings, a specimen of a regular square column specified in 5.19.1 (molding material) of JIS K 6911 was prepared. This test specimen was filled in a mold, cured in a test room at -25 ° C. for 7 days, and then removed from the mold. With this test body, the cure shrinkage rate of the injection adhesive according to the present embodiment was calculated. Specifically, the liquid specific gravity is calculated according to JIS K 6833 6.1.1 (specific gravity cup method), and the solid specific gravity is calculated according to JIS K 7112 5.1 [method A (submerged in water)]. The cure shrinkage rate, which is the linear shrinkage rate, was determined from the calculated liquid specific gravity and solid state according to the following equation (1).

Here, S: cure shrinkage rate (%), D ₁ : liquid specific gravity, D ₂ : solid specific gravity.

  When calculated by the formula (1), the curing shrinkage rate S of the adhesive for injection according to the present embodiment is 2.97%, which satisfies the standard of 3% or less.

[Adhesive injection method]
Next, the adhesive injection method according to the embodiment of the present invention will be described. The adhesive injection method according to the present embodiment is different from the adhesive injection method that injects into cracks in concrete, and the adhesive is applied to a relatively thick space region in which the gap between the structure and the reinforcing material exceeds 20 mm. This is a method of injection filling and integration. In addition, the adhesive injection method according to the present embodiment is suitably applied in the case of construction in a cryogenic environment such as a cold region that is −25 ° C. or lower.

  In addition, the case where the reinforcing material which consists of a steel plate 2 is adhere | attached and reinforced is demonstrated to the bottom face of the existing concrete floor slab 1 which is a reinforced concrete structure as a structure, and is demonstrated. FIG. 1 is a vertical sectional view showing a gap 3 for injecting an adhesive by an adhesive injection method according to an embodiment of the present invention, and FIG. 2 is a flowchart showing each process of the adhesive injection method according to this embodiment. It is.

  As shown in FIG. 1, in the adhesive injection method according to the embodiment of the present invention, a concrete floor slab 1 and a steel plate 2 are installed at an interval, and the aforementioned injection adhesive is injected into the gap 3 to provide concrete. A steel plate 2 is bonded to the floor slab 1 to be integrated and reinforced. Of course, the structure is not limited to a reinforced concrete structure, and can be applied to various structures such as masonry structures such as bricks. Further, the reinforcing material is not limited to a steel material such as a steel plate, and can be applied to an object other than the steel material such as a carbon fiber sheet.

(1) Room temperature A liquid production | generation process First, as shown in FIG. 2, in the adhesive agent injection construction method which concerns on this embodiment, the above-mentioned main ingredient and hardening | curing agent are stirred and mixed in the normal temperature environment used as 0 degreeC or more. A normal temperature A liquid production | generation process which produces | generates A liquid containing these is performed.

  Specifically, in this step, the above-mentioned curing agent is blended with the above-mentioned main agent at a ratio of 1.0% to 20.0% with respect to the weight of the main agent, and stirred with a stirrer for about 3 minutes. A liquids of the above-mentioned injection adhesive and sealing adhesive are respectively produced. At this time, about 20% of the fine aggregate is added to the weight of the main agent. Moreover, you may add an additive as needed.

  Here, the room temperature environment refers to a temperature environment of 0 ° C. or higher at which moisture does not freeze and 55 ° C. or lower that is assumed on a normal earth, and the adhesive injection method according to this embodiment is performed in a cold region. In this case, this step is performed in a room where heating is effective and the temperature is 0 ° C. or higher.

  In addition, the adhesive according to the present embodiment is a three-component reaction curable resin as described above, and does not cure immediately by simply mixing the curing agent with the main agent, but gradually takes about 7 days. To do. For this reason, this process can be performed in a room temperature environment in a warm region far from the cold region, and the produced A liquid can be put in a pail can and transported to the cold region.

  In the conventional adhesive injection method, since the curing agent is generally a powder, it is not evenly mixed with the main agent in a cryogenic environment, which causes a curing failure. For this reason, the adhesive injection method has not been used in a cryogenic environment. In addition, although there is a curing agent that is dissolved in a solvent to become a liquid, the problem that the solvent becomes a sherbet under a very low temperature environment and is not mixed equally like a powder curing agent is solved. I did not. However, in this process, since the main agent and the curing agent are mixed in advance in a normal temperature environment of 0 ° C. or higher, the curing agent is evenly dissolved in the main agent, so that the curing agent is not evenly mixed. The possibility of defects can be eliminated.

(2) Sealing Step Next, as shown in FIGS. 2 and 3, in the adhesive injection method according to the present embodiment, the concrete floor slab is used so that the injection adhesive does not leak in a post-process under a cryogenic environment. A sealing step of sealing the periphery of the gap 3 between 1 and the steel plate 2 with the above-described sealing adhesive 4 is performed. FIG. 3 is a process explanatory diagram illustrating a sealing process of the adhesive injection method according to the present embodiment.

  Specifically, in a cryogenic environment, the B liquid in which the main agent and the accelerator are mixed is added to the A liquid of the sealing adhesive generated in the previous step, and the mixture is stirred for about 3 minutes as described above. A putty-like sealing adhesive 4 that does not allow sagging is produced.

  Then, as shown in FIG. 3, weirs are made with a putty-like sealing adhesive 4 along the end of the steel plate 2 and sealed so that the injection adhesive 5 (see FIG. 4) does not leak.

  Thus, by performing this step, the low viscosity injection adhesive 5 (see FIG. 4) can be injected between the concrete slab and the steel plate without leaking in the subsequent step.

(3) Cryogenic adhesive production process Next, as shown in FIG. 2, in the adhesive injection method according to the present embodiment, A of the injection adhesive produced in the normal temperature A liquid production process in a cryogenic environment. The cryogenic adhesive production | generation process which adds the B liquid of the injection adhesive containing a promoter to the liquid and produces | generates the injection adhesive is performed.

  Specifically, in this process, in a cryogenic environment, the accelerator is blended at a ratio of 1.0% to 16.0% with respect to the weight of the main agent, and stirred for 3 minutes with an agitator or the like. B liquid for adhesive is produced.

  Then, in a cryogenic environment, the B liquid generated in this step is added to the A liquid of the injection adhesive generated in the normal temperature A liquid generating step, and further stirred for about 3 minutes to generate the injection adhesive. . At this time, as described above, the injection adhesive produced in this step has a viscosity of about 1125 (mPa · s) even in a cryogenic environment, and a viscosity of 3000 (mPa · s) that can be injected in a later step. Is far below.

  The accelerator is a liquid even in a cryogenic environment, and there is little problem that it is not mixed evenly compared with the curing agent. Further, as described above, in this step according to the embodiment, the main agent is divided into the A liquid and the B liquid in half, so that even in an extremely low temperature environment, they can be mixed evenly in a short time.

(4) Cryogenic adhesive injection process Next, as shown in FIGS. 2 and 4, in the adhesive injection method according to the present embodiment, the injection adhesive generated in the previous process is applied to concrete in a cryogenic environment. A cryogenic adhesive injection process for injecting into the gap 3 between the floor slab 1 and the steel plate 2 is performed. FIG. 4 is a process explanatory view showing a cryogenic adhesive injection process of the adhesive injection method according to the present embodiment.

  Specifically, in this step, the sealing adhesive 4 is sealed in the previous sealing step by pumping the injection adhesive 5 generated in the previous step with an injection device such as a pump or a squeeze pump in a cryogenic environment. It injects into the gap 3 between the concrete floor slab 1 and the steel plate 2 surrounded by.

  At this time, as described above, the injection adhesive to be injected has a viscosity of about 1125 (mPa · s), which is much lower than the viscosity 3000 (mPa · s) that can be injected by the above-described injection device. For this reason, the adhesive 5 for injection | pouring can be smoothly filled between the concrete floor slab 1 and the steel plate 2 in a short time without a space | gap being formed also in a cryogenic environment. In order to fill without forming voids, the viscosity of the injection adhesive is preferably 1500 (mPa · s) or less.

  According to the adhesive injection method according to the present embodiment described above, the concrete floor slab 1 and the reinforcing material, which are structures, even in a severe cryogenic environment of -25 ° C or lower, for example, about -30 ° C. The steel plate 2 can be reliably integrated and reinforced. Further, at this time, it is not necessary to heat the entire structure only by heating only when the liquid A is generated, and it is possible to save energy and reduce the construction cost for the reinforcement work of the structure.

  In addition, according to the adhesive injection method according to the present embodiment, since the liquid containing the main agent and the accelerator of the adhesive is mixed with the liquid A as the liquid B, the main agent, the curing agent and the accelerator are accelerated even in a cryogenic environment. The agent can be mixed evenly in a short time. For this reason, the quality of the adhesive is stable even in a cryogenic environment, and the concrete slab 1 and the steel plate 2 can be reliably integrated and reinforced with the adhesive 5 for injection.

  In addition, according to the adhesive injection method according to the present embodiment, as described above, the curing shrinkage rate of the injection adhesive 5 is 3% or less in an extremely low temperature environment, so that the acrylic resin has a high cure shrinkage rate. Even an adhesive having a main component can be reliably integrated and reinforced without generating voids. In addition, according to the adhesive injection method according to the present embodiment, the necessary strength in a cryogenic environment can be ensured, and the structure and the reinforcing material can be reliably integrated and reinforced.

[Effectiveness confirmation test]
Next, with reference to FIG. 5, a description will be given of a curing and cutting test of a specimen performed to confirm the curing state and filling state of the adhesive after curing by the adhesive injection method according to the present embodiment. FIG. 5 is a photograph showing a cut vertical section of the specimen.

  A gap of 40 mm in thickness is provided on the concrete structure, filled with coarse aggregate, and sealed around the gap with a sealing adhesive in the above-described manner under an extremely low temperature environment of −30 ° C. A specimen is prepared by injecting the above-mentioned injection adhesive. After curing, the specimen was cut, and the presence or absence of curing shrinkage of the adhesive, the presence or absence of poorly cured portions, and the filling state were visually confirmed.

  As shown in FIG. 5, no voids were found in the cured portion of the adhesive even under an extremely low temperature environment of −30 ° C. Thus, it was confirmed that the adhesive was filled without voids without poor curing or shrinkage of the adhesive. In addition, when the results of the strength tests shown in Table 1 are combined, it can be said that the structure and the reinforcing material were reliably integrated and reinforced even in a cryogenic environment.

  As described above, the adhesive injection method according to the embodiment of the present invention and the adhesive used therefor have been described in detail. However, each of the above-described or illustrated embodiments shows an embodiment embodied in carrying out the present invention. It is just a thing. Therefore, the technical scope of the present invention should not be limitedly interpreted by these.

  The adhesive injection method according to the present invention and the adhesive used for the adhesive injection method are those in which the structure and the reinforcing material are integrated with the adhesive in an extremely low temperature environment of −25 ° C. or lower such as in a cold region. It is preferably applied to.

1: Concrete slab (structure)
2: Steel plate (reinforcing material)
3: Gap (injection space)
4: Adhesive for sealing 5: Adhesive for injection

Claims (6)

It is an adhesive injection method in which a structure and a reinforcing material that reinforces the structure are bonded and integrated by injecting an adhesive therebetween,
The adhesive comprises a main agent made of an acrylic resin, a curing agent that cures the main agent, and an accelerator that promotes the reaction of the curing agent,
In a normal temperature environment of 0 ° C. or more, a normal temperature A liquid generation step of stirring and mixing the main agent and the curing agent to generate A liquid containing them,
In a cryogenic environment of -25 ° C. or lower, the liquid A produced in the previous step and the liquid B containing the accelerator are mixed, and the viscosity is 3000 mPa · s or less in the cryogenic environment. A cryogenic adhesive production step for producing the adhesive,
A cryogenic adhesive injection step of injecting the adhesive generated in the previous step between the structure and the reinforcing material by an injection device such as a pump or a squeeze pump in the cryogenic environment. Adhesive injection method characterized by Before the cryogenic adhesive injection step, using a sealing adhesive containing a main agent composed of an acrylic resin, a curing agent for curing the main agent, and an accelerator for promoting the reaction of the curing agent, The adhesive injection method according to claim 1, further comprising a sealing step of sealing a periphery between the structure and the reinforcing material so that the adhesive does not leak under a cryogenic environment. 3. The adhesive injection method according to claim 1, wherein, in the cryogenic adhesive generation step, a liquid containing the main agent and the accelerator is mixed with the liquid A as the liquid B. 4. In the cryogenic adhesive generation step, fine aggregate is mixed with the main agent so that the curing shrinkage rate of the adhesive is 3% or less in the cryogenic environment. 4. The adhesive injection method according to any one of 3 to 3. An adhesive used for the adhesive injection method according to any one of claims 1 to 4,
A main agent composed of an acrylic resin, a curing agent that cures the main agent, and an accelerator that accelerates the reaction of the curing agent,
An adhesive having a viscosity of 3000 mPa · s or less in the cryogenic environment and a cure shrinkage of 3% or less in the cryogenic environment. The compressive strength in the cryogenic environment is 60 N / mm ² or more, the shear strength is 10 N / mm ² or more, and the tensile strength is 20 N / mm ² or more.