JP7029967B2 - Concrete surface repair method by low pressure injection repair method - Google Patents

Description

The present invention relates to a method for repairing a concrete surface by a low-pressure injection repair method.

As for the repair method when cracks or dents occur in the concrete structure, seal the cracks or dents, fix the injection washer with a quick-curing adhesive, and attach the injection tool to this injection washer. A method of injecting a repair material into a cracked portion or a dented portion and removing a washer and a sealing agent after curing is known as a prior art (Patent Documents 1 and 2).

However, with the above method, it is difficult to remove the injection washer and the sealant after the quick-curing adhesive is cured, and the surface coating of the concrete may be damaged, which causes a disadvantage that the appearance and appearance are deteriorated. there were.

In order to eliminate this inconvenience, as a repair method that can be easily peeled off after construction, a method of adhering the sealant and the washer with the same material (one-component moisture-curable resin composition) is known (Patent Document). 3).

In addition, by using an adhesive tape instead of a sealing agent, the coating sealing workability is good even in a wide temperature environment, the repair material can be injected in a short time after application, and the structure is an adherend after the repair material is cured. A construction method using an adhesive tape for coating sealing that can be easily removed without damaging the surface of an object is known (Patent Document 4).

Tokukousho 61-5378 Gazette Tokko Showa 63-8154 Gazette JP-A-2015-78568 Japanese Unexamined Patent Publication No. 2017-66237

However, as in Patent Document 1 and Patent Document 2, the method of using a quick-curing adhesive for adhering a washer has a problem that the usable time of the adhesive is short and the workability is poor. In addition, the repair material may leak due to a mistake in blending the adhesive or uneven thickness during application, which requires the skill of the installer. Another problem was the disposal of excess adhesive.

Further, as the adhesive tape for coating sealing disclosed in Patent Document 4, usually, a tape having a high surface transparency and a smooth surface is adopted in order to improve the visibility of the cracked portion at the time of application, but an adhesive is used. At that time, since the surface of the tape is smooth, the adhesive strength of the washer is low, and there is a problem that the washer is difficult to fix.

Therefore, it is an object of the present invention to provide a means for preventing leakage of the repair material, simplifying and improving the efficiency of the work, and reliably fixing the washer in the low pressure injection repair method. do.

The present inventors have conducted diligent research under the above-mentioned problems, found that the above-mentioned problems can be solved by fixing the washer by a novel method, and completed the present invention. That is, the present invention is as follows.

The present invention (1) is a low-pressure injection repair method for injecting a repair material into a portion of a concrete surface to be repaired to repair the concrete surface.
A washer fixing step of fixing a washer having an injection port to a concrete surface via a washer fixing tape having an adhesive layer on both sides, and the repair to the repair target portion of the concrete surface via the injection port. It is a low-pressure injection repair method including an injection step of injecting a material.
The present invention (2) is
The low-pressure injection repair method according to the invention (1), which satisfies either of the following (I) or (II).
(I) The bottom portion is provided with an annular convex portion which is a convex portion forming a ring surrounding the injection port, and the annular convex portion is provided only in the vicinity of the injection port for fixing the washer. When the total thickness of the tape is T and the height of the annular convex portion is Z, T> Z is satisfied.
(II) The bottom portion is provided with a main annular convex portion which is a convex portion forming a ring surrounding the injection port, and one or a plurality of sub-annular convex portions surrounding the main annular convex portion. The main annular convex portion is provided in the vicinity of the injection port, the total thickness of the washer fixing tape is T, the height of the main annular convex portion is Z ₁ , and the highest among the sub-annular convex portions. When the height of the convex portion is Z ₂ , Z ₁ > Z ₂ and T> (Z ₁ to Z ₂ ) are satisfied.
The present invention (3) is
The low-pressure injection repair method according to the invention (2), which satisfies either of the following (1A) or (2A).
(1A) The total thickness T of the washer fixing tape is 1.2 times or more the height Z.
(2A) The total thickness T of the washer fixing tape is _1.2 times or more that of Z1 _- Z2.
The present invention (4) is
The low-pressure injection repair method according to any one of the inventions (1) to (3), wherein the washer fixing tape has an adhesive layer made of a butyl adhesive.
The present invention (5)
Prior to the washer fixing step, a covering step of covering the repair target portion with a covering member is further provided.
The low-pressure injection repair method according to any one of the inventions (1) to (4), wherein the covering member is an adhesive tape.
The present invention (6) is
A tape for fixing a washer, which is used in the low-pressure injection repair method according to any one of the inventions (1) to (5) and has an adhesive layer on both sides.

According to the present invention, in the low-pressure injection repair method, it is possible to simplify and improve the efficiency of the work while preventing leakage of the repair material, and it is possible to reliably fix the washer.

FIG. 1 shows an outline of a process according to the present embodiment in which a washer is placed and fixed on the surface of the adhesive tape for coating via a washer fixing tape after the adhesive tape for coating is attached to a repair target portion (crack) of a structure. It is a conceptual diagram which shows. (A-1) and (a-2) are conceptual top views and conceptual side views of the repair target site (crack) of the structure, respectively, and (b-1) and (b-2) are for coating, respectively. It is a conceptual top view and a conceptual side view in which the adhesive tape is attached to the repair target part (crack) of the structure, and (c-1) and (c-2) are the adhesive tapes for coating via the seat metal fixing tape, respectively. It is a conceptual top view and a conceptual side view showing the outline of the seat fixing process according to the present embodiment in which the seat is arranged and fixed on the surface of the above. FIG. 2 is a conceptual diagram showing an outline of a process according to the present embodiment in which a washer is placed and fixed on a concrete surface via a washer fixing tape, and then a sealing material is applied to a repair target portion (crack) of a structure. be. (A-1) and (a-2) are conceptual top views and conceptual side views of the repair target site (crack) of the structure, respectively, and (b-1) and (b-2) are washers fixed, respectively. It is a conceptual top view and a conceptual side view showing the outline of the washer fixing process according to the present embodiment in which the washer is arranged and fixed on the concrete surface via the tape, and (c-1) and (c-2) are respectively. It is a conceptual top view and a conceptual side view which shows the outline of the covering process which concerns on this Embodiment which covers an exposed repair target part using a sealing material. FIG. 3 is a conceptual cross-sectional view and a conceptual bottom view showing an example of a washer that can be used in the concrete surface repair method according to the present embodiment. FIG. 4 is a conceptual cross-sectional view and a conceptual bottom view showing an example of a washer that can be used in the concrete surface repair method according to the present embodiment. FIG. 5 is a conceptual cross-sectional view and a conceptual bottom view showing an example of a washer that can be used in the concrete surface repair method according to the present embodiment. FIG. 6 is a conceptual cross-sectional view and a conceptual bottom view showing an example of a washer that can be used in the concrete surface repair method according to the present embodiment. FIG. 7 is a conceptual cross-sectional view and a conceptual bottom view showing an example of a washer that can be used in the concrete surface repair method according to the present embodiment. FIG. 8 is a conceptual cross-sectional view and a conceptual bottom view showing an example of a washer that can be used in the concrete surface repair method according to the present embodiment. FIG. 9 is a conceptual cross-sectional view and a conceptual bottom view showing a method of attaching the adhesive tape for fixing the washer to an example of the washer that can be used in the concrete surface repair method according to the present embodiment. FIG. 10 is a conceptual cross-sectional view and a conceptual bottom view showing an example of a washer that can be used in the concrete surface repair method according to the present embodiment. FIG. 11 is a conceptual cross-sectional view and a conceptual bottom view showing a method of attaching the adhesive tape for fixing the washer to an example of the washer that can be used in the concrete surface repair method according to the present embodiment. FIG. 12 shows a special instrument capable of placing and fixing a washer on the surface of a structure to be repaired (cracked) with an adhesive tape for coating via a washer fixing tape, and pressurizing and injecting the washer into the injection port. It is a conceptual diagram which shows the outline of the repair process which concerns on this Embodiment which was set, and the repair material was injected and filled in the part to be repaired. {(A) is a conceptual side view in which a special instrument capable of pressure injection is set in the injection port of the washer, and the repair material is injected and filled in the repair target site, and (b) is a conceptual side view after the injected repair material is cured. It is a conceptual side view with the special instrument injected under pressure removed}. FIG. 13 shows a series according to the present embodiment in which the adhesive tape for coating is peeled off from the repair target portion and removed while the washer is still on the surface, and the repair material filled in the repair target portion is cured. It is a conceptual diagram which shows the outline of the concrete surface after the process of (1) is completed. {(A) is a conceptual top view of the repaired part where a series of repair steps have been completed, and (b) is a conceptual side view of the repaired part where a series of repair steps have been completed}. FIG. 14 is a conceptual cross-sectional view showing a situation in which the injection washer is fixed to the concrete surface via a tape (tape for fixing the washer) in the embodiment.

Next, the concrete surface repair method according to the present invention will be specifically described with reference to FIGS. 1 to 11, but the present invention is not limited to the following.

The concrete surface repair method according to the present invention includes a repair step of fixing a washer having an injection port to the concrete surface and then injecting a repair material into a repair target portion of the concrete surface through the washer injection port. Further, the concrete surface repair method according to the present invention may include yet another step before and after each step or during each step. For example, a covering step of covering the repair target portion with a covering member may be provided before the repair step. It is not necessary to provide such a coating step. Further, the pretreatment step may be included before the coating step, or the posttreatment step may be included after the repair step. That is, the concrete surface repair method according to the present invention preferably comprises the following steps. Hereinafter, each step will be described.
(1) Pretreatment process (2) Coating process (3) Repair process (4) Posttreatment process

Here, in the present invention, the "repair target portion" is a space such as a crack, a dent, a chip, a scratch, a hole, a groove, etc., on which a fluid repair material can be injected, or a concrete surface forming the space. Shows the edge.

Further, in the present invention, "repair" means an act of injecting a repair material into such a repair target site. Therefore, in the present invention, the act of injecting a repair material into a groove or a hole provided as a design also corresponds to repair.

<<< 1. Pretreatment process >>>
The pretreatment step is a step of preparing a concrete surface including a repair target portion in advance and improving the adhesiveness of a covering member, a washer fixing tape, etc., which will be described later. More specifically, a polishing process for polishing the area around the repair target area with a disc sander, scraper, etc., a drying process for evaporating the water remaining around the repair target area with the sun, a dryer, etc., dust existing in the repair target area, etc. A cleaning process that removes pebbles.

Further, as a pretreatment step, a primer application step, which is a step of applying a primer (primer for applying a concrete surface) around a repair target portion (a range in which a covering member is applied), may be provided. The primer for applying the concrete surface is not limited as long as it is an agent capable of improving the adhesiveness between the covering member or the tape for fixing the seat, which will be described later, and the concrete surface, and the material of the adhesive surface and the like (for example, adhesive tape). The type and amount of the adhesive may be determined according to the type of the adhesive (such as the type of the adhesive). For example, as the primer, a water-soluble epoxy primer, a primer composed of an organic acid-based aqueous solution, or the like can be used.

<<< 2. Coating process >>>
The covering step is a step of attaching a covering member to the repair target portion and covering the repair target portion. By covering the part to be repaired with a covering member, it is possible to prevent the repairing material from sticking out of the part to be repaired or the repairing material from rising. Here, the coating step is not particularly limited as long as it is a step using a known covering member. Examples of the coating step include a sealing material coating step using a sealing material (modified silicone resin, paste) as a coating member, and an adhesive tape coating step using a coating adhesive tape as a coating member. Hereinafter, each will be described.

<< Sealing material coating process >>
The sealing material coating step is a step of applying (for example, applying) the sealing material to the repair target portion so that at least a part of the repair target portion is covered with the sealing material.

The specific coating method using the sealing material is not limited, and a known method can be applied. Specifically, for example, a paste-like sealing material may be applied so as to close the repair target portion, and the paste-like sealing material may be dried and cured as necessary. Further, the size of the applicable repair target portion can be changed by changing the viscosity of the sealing material or the like.

Here, the details will be described later, but the washer is fixed to the concrete surface via the washer fixing tape attached to the bottom of the washer. However, when the part to be repaired is covered with a sealing material, an uneven surface is formed at the curing stage. Therefore, when the washer is fixed on the uneven surface, the adhesiveness of the washer fixing tape becomes poor. It may not be exhibited. Therefore, when a sealing material covering step is provided as a covering step, usually, the washer is first fixed on the concrete surface so as to cover the repair target part, and the repair target part not covered by the washer is covered with the sealing material. Cover.

<Sealing material>
As the sealing material in the sealing material coating process, a known sealing material used in a normal low-pressure injection repair method can be used, and the sealing material is not limited in any way. Can be mentioned.

<< Adhesive tape coating process >>
In the adhesive tape coating step, at least a part of the adhesive layer of the adhesive tape for coating is applied to the concrete surface so that at least a part or all (preferably all) of the part to be repaired is covered with the adhesive tape for coating. This is the process of contacting.

If the repair target site is not linear (for example, in the case of a complex shape such as a meandering shape or a spider web shape), the repair target site is divided into a plurality of sections and the length is adjusted for each section. The part to be repaired may be covered with the adhesive tape for covering. Further, in such a case, the adhesive tapes for coating may be overlapped and affixed to each other.

Further, the adhesive tape for coating is provided with an opening for injecting a repair material described later, but the means thereof is not particularly limited. For example, after the tape application step, a through hole is made in an arbitrary part of the adhesive tape for coating, a coating adhesive tape having a through hole into which the repair material can be injected in advance is used, or a gap into which the repair material can be injected is provided. The tape member may be arranged in such a manner.

Further, the washer may be fixed on the concrete surface so as to cover the repair target portion first, and the repair target portion not covered by the washer may be covered with the adhesive tape for covering. In such a case, since the injection port of the washer and the repair target site are directly communicated with each other without passing through the adhesive tape for coating, the step of providing an opening in the adhesive tape for coating as described above is unnecessary.

<Adhesive tape for coating>
The adhesive tape for coating used in this step is an adhesive tape having an adhesive layer (hereinafter, the adhesive layer may be simply referred to as an adhesive) on the outermost surface layer (the side that comes into contact with the concrete surface). Typically, it is composed of two layers, an adhesive layer and a support layer (hereinafter, the support layer may be simply referred to as a support). In addition, the adhesive tape for coating may be a double-sided adhesive tape or a tape having a plurality of support layers and adhesive layers. Further, the adhesive tape for coating may be in a form in which a release liner for protecting the adhesive layer is provided before use, and the release liner is peeled off at the time of use. As such a release liner, those used for ordinary adhesive tapes, for example, a silicone-based release liner, a fluorine-based release liner, and the like can be used.

(Adhesive layer)
The pressure-sensitive adhesive used for the coating pressure-sensitive adhesive tape in this step is not particularly limited, and for example, various pressure-sensitive adhesives such as rubber-based, acrylic-based, urethane-based, silicone-based, elastomer-based, and ethylene-vinyl acetate copolymer series are used. However, it is preferable to contain a rubber-based adhesive from the viewpoint of removability to the repair material, and it is more preferable to contain a styrene-based elastomer suitable for coating by the hot melt method from the viewpoint of productivity. ..

The styrene-based elastomer is not particularly limited, and for example, various styrene-based elastomers such as styrene isoprene-based copolymers, styrene-butadiene-based copolymers, and hydrogenated additives thereof can be used.

Further, as the pressure-sensitive adhesive used for the coating pressure-sensitive adhesive tape, it is preferable to contain 40 to 120 parts by weight of the tackifier resin with respect to 100 parts by weight of the styrene-based elastomer. The tackifier resin used for the pressure-sensitive adhesive of the present invention is not particularly limited, and for example, various tackifier resins such as rosin ester-based resin, terpene-based resin, phenol-based resin, petroleum-based resin, and hydrogenated additives thereof. Can be used. In addition, a plurality of types of tackifier resins may be used in combination. When the pressure-imparting resin contained in the pressure-sensitive adhesive layer is less than 40 parts by weight with respect to 100 parts by weight of the styrene-based elastomer, the surface of the structure is cracked and the adhesiveness to the vicinity of the repair target site is insufficient, and the repair material is pressure-injected. At that time, the adhered portion may be lifted or peeled off, and the repair material may leak out. On the other hand, even if the pressure-imparting resin contained in the pressure-sensitive adhesive layer exceeds 120 parts by weight with respect to 100 parts by weight of the styrene-based elastomer, the pressure-sensitive adhesive may become hard and the repair material may leak out. Further, adhesive residue may be generated on the epoxy resin-based repair material at the time of peeling 24 hours after application.

The pressure-sensitive adhesive used for the adhesive tape for coating preferably contains 20 to 60 parts by weight of a softener with respect to 100 parts by weight of the styrene-based elastomer. The softener used for the pressure-sensitive adhesive is not particularly limited, and for example, various softeners such as naphthen-based and paraffin-based process oils, liquid polybutadiene, liquid butyl rubber, low molecular weight polyisobutylene, medium molecular weight polyisobutylene, and polybutene can be used. Can be used. A plurality of types of softeners may be used in combination. If the amount of the softening agent contained in the pressure-sensitive adhesive layer is less than 20 parts by weight with respect to 100 parts by weight of the styrene-based elastomer, the adhesive is applied when the repair target part such as cracks and dents in the structure is not smooth or at low temperature in winter. The initial adhesion of the coating adhesive tape is insufficient, a gap is formed between the adhesive tape and the adherend surface, and the repair material may leak when the repair material is pressure-injected. On the other hand, if the amount of the softening agent contained in the pressure-sensitive adhesive layer exceeds 60 parts by weight with respect to 100 parts by weight of the styrene-based elastomer, the fixing property of the coating pressure-sensitive adhesive tape to be attached is insufficient under high temperature in summer, and the repair material is used. The repair material may leak out when injected under pressure. At the same time, it becomes easy to coagulate and break, and when the adhesive tape for coating is removed after the repair material is cured, the adhesive may remain on the cracks on the surface of the structure, the part to be repaired, and the repair material.

The pressure-sensitive adhesive layer may contain an ultraviolet absorber, a filler, an antioxidant, a light stabilizer, and the like. The amount of these additives depends on the added components to be blended, but usually, the total amount is 0.001 to 50 parts by weight, preferably 0.1 to 30 parts by weight, based on 100 parts by weight of the pressure-sensitive adhesive. Appropriately blended.

(Support layer)
The support used for the adhesive tape for coating is not particularly limited, and for example, a plastic film, a non-woven fabric, paper, a cloth, a metal foil, or a composite thereof can be used. The material is not particularly limited, and is a polyolefin-based material such as polypropylene, ethylene-propylene copolymer, ethylenebutene-1 copolymer, ethyleneoctene copolymer, ethylenevinyl acetate copolymer, and ethylenevinyl alcohol copolymer. , Polyvinyl alcohol-based materials, acrylic materials such as polymethylmethacrylate, polyester-based materials such as polyethylene terephthalate and polybutylene terephthalate, polyamide-based materials such as nylon 6, nylon 6,6, and metal ions such as zinc and sodium in the structure. Various ionomer materials, polystyrene, styrene isoprene copolymers, styrene materials such as styrene butadiene copolymers, polyurethane materials, vinyl chloride materials, fluoromaterials, acetates, cellophane and other cellulose materials, rayon, cotton Etc., one kind or a combination of two or more kinds of various materials such as metals such as aluminum, copper, silver, gold, tin and stainless steel can be used. The support is not particularly limited, but a biaxially stretched polypropylene film or a biaxially stretched polyester film is preferable. In addition, it is preferable to use a transparent plastic film or the like as a support for the adhesive tape for coating in order to confirm the filling status of the repair material. Further, preferably, a primer made of an acrylic resin, a vinyl copolymer, a modified polyolefin resin, a rubber resin, a polyester resin, or a polyurethane resin is applied to one side of this film, dried, and then placed on the primer. It was obtained by applying an adhesive.

The width, length, thickness, etc. of the adhesive tape for coating can be freely designed according to the size and surface shape of the part to be repaired, and may be in the form of a wide sheet, but is preferable. Is an elongated strip. When the tape has an elongated strip shape, it is preferable to wind it in a roll shape and stretch it at the time of use.

With respect to the thickness of the adhesive tape for coating, more specifically, the total thickness (average total) of the adhesive tape for coating composed of at least a support layer and an adhesive layer, or at least a support layer, an adhesive layer and a release liner. The thickness) is preferably 500 μm or less. When the total thickness exceeds 500 μm, the material cost, the process cost of the pressure-sensitive adhesive coating process, and the like increase as the thickness increases, so that the manufacturing cost of the pressure-sensitive adhesive tape for coating may be considerably high. Further, when the adhesive tape for coating is wound in a roll shape, the winding diameter becomes large, and when the worker attaches the adhesive tape to the repair target portion, it is necessary to carry the adhesive tape for coating. As the winding diameter becomes large, it becomes difficult to handle, so the winding length must be shortened in order to keep the winding diameter below a certain level, and it is necessary to frequently replace it with a new roll in a short time, so it is attached outdoors. It can be a very complicated task for the worker who performs the work. The lower limit of the total thickness (average total thickness) of the adhesive tape for coating is not particularly limited, but is, for example, 65 μm, preferably 140 to 250 μm.

Further, the adhesive tape for coating preferably has an adhesive thickness (average thickness) of 80 to 280 μm. If the thickness of the adhesive is less than 80 μm, the surface of the structure will be cracked, and the adhesion to the area around the repair target will be insufficient. Repair material may leak out. On the other hand, if the thickness of the adhesive exceeds 280 μm, the surface of the structure is cracked, the adhesive strength to the repair target site and the repair material becomes too high, and the adhesive tape for coating is strong when the adhesive tape for coating is removed after the repair material is cured. It is necessary to peel it off by force, which may deteriorate the peeling workability.

Further, the adhesive tape for coating preferably has a support having a thickness (average thickness) of 60 to 200 μm. If the thickness of the support is less than 60 μm, when the repair material is pressurized and injected, the repair material injected from the end of the tape may overflow or the tape may swell, and after the repair material is cured, the coating material may be used. When the adhesive tape is removed, the adhesive tape for coating may be greatly stretched, making it difficult to peel off or breaking. On the other hand, when the thickness of the support exceeds 200 μm, the stiffness of the support becomes stronger, and the followability of the adhesive tape for coating to be attached when the repair target part such as a crack or a dent in the structure is not smooth. There is a possibility that the repair material may leak out when the repair material is pressure-injected due to insufficient adhesion and a gap between the material and the adherend surface.

Further, the support layer and the pressure-sensitive adhesive layer are preferably thicker than the pressure-sensitive adhesive layer in terms of their average thickness. When the adhesive tape for coating is attached while covering the surface of the portion to be repaired, if the portion to be repaired is not linear, the adhesive tape for coating may be attached by laminating from above. Therefore, since it is necessary to follow the step of the support layer itself, it is preferable that the pressure-sensitive adhesive layer is thicker.

In addition to the adhesive layer described above, the adhesive tape for coating may additionally contain various additives as necessary for each layer of the support layer, primer, and release liner as long as the purpose is not impaired. can. Although not particularly limited, for example, an ultraviolet absorber, a processing stabilizer, an antistatic agent, a lubricant, a filler, an antioxidant, a light stabilizer, an inorganic pigment, a peeling agent and the like can be appropriately blended.

In the coating step, as a step of attaching a tape other than the above-mentioned adhesive tape for coating, for example, a step of attaching a curing tape so as to surround the repair target portion may be provided.

<<< 3. Repair process >>>
The repair step is a step including a washer fixing step and an injection step. Hereinafter, the washer fixing step and the injection step will be described.

<< Washer fixing process >>
The washer fixing step is a step of fixing a washer having an injection port (injection washer, hereinafter simply referred to as a washer, etc.) to a concrete surface using a washer fixing tape (via a washer fixing tape). be. If the position of the washer is substantially fixed to the concrete surface, even if other members (for example, the above-mentioned primer, covering member, etc.) are interposed between the washer fixing tape and the concrete surface. good. More specifically, for example, in the washer fixing step, the entire cross section after the washer is fixed is represented by a concrete surface / covering member / washer fixing tape / washer, or a concrete surface / washer fixing tape / washer. Fix the washer so that it becomes. At this time, the position of the injection port of the washer and the position of the repair target portion are made to substantially match.

As a specific washer fixing step, for example, as shown in FIG. 1, the above-mentioned coating adhesive tape coating step is carried out, and after the repair target portion is covered with the coating adhesive tape, {FIG. 1 (b-1). ), Fig. 1 (b-2)}, the bottom of the washer is placed on the adhesive tape (concrete surface) for coating so that the position of the injection port and the position of the repair target site match via the washer fixing tape. Fix {Fig. 1 (c-1), Fig. 1 (c-2)}.

As another specific washer fixing step, for example, as shown in FIG. 2, the bottom of the washer is covered so as to cover the repair target site and the position of the injection port and the repair target site are aligned with each other. Is fixed on the concrete surface via the washer fixing tape {FIG. 2 (b-1), FIG. 2 (b-2)}. Next, if necessary, a coating sealing material (for example, modified silicone resin, paste) is used to coat the exposed repair target site {FIGS. 2 (c-1) and 2 (c-2). )}.

Further, the washer fixing tape may be attached on the concrete surface and the washer may be fixed on the washer fixing tape, or the washer fixing tape may be attached to the bottom of the washer in advance and attached to the washer. A washer with a washer fixing tape attached may be placed on a concrete surface to fix the washer. When the washer is fixed, there is no problem that the washer is displaced to the extent that there is no problem in practical use or a part of the washer is peeled off.

The washer fixing tape needs to be provided with an opening so as not to obstruct the communication between the washer injection port and the repair target site in the injection step described later. In addition, such an opening may be provided by penetrating the washer fixing tape with an instrument so as to provide the opening after fixing the washer with the washer fixing tape, or the opening may be provided from the beginning. A washer fixing tape may be used.

<Washer>
FIG. 3 shows an example of a washer used in the low pressure injection repair method of the present invention. As shown in FIG. 3, the washer is a member having an injection port and a bottom having at least a size such that a tape for fixing the washer can be attached. The bottom portion is a surface (a surface close to the concrete surface) on the side fixed to the concrete surface. The injection port is usually provided so as to penetrate in the height direction of the washer, and the repair material injected from the head side can be discharged from the bottom side.

Here, the washer may have a convex portion at the bottom. As shown in FIG. 3, in the form having no convex portion at the bottom, the height of the convex portion is 0 mm. By providing such a convex portion on the bottom portion, when fixing with an adhesive (adhesive layer in the tape for fixing the washer), the adhesive in contact with the bottom portion of the washer is less likely to flow into the injection port side. It does not prevent the injection port. Also, when fixing with adhesive tape, having a convex part has the effect of serving as a guide for alignment when attaching the adhesive tape to the bottom of the washer, and the adhesive tape mistakenly closes the injection port. You can prevent that. Here, in the conventional method of fixing the washer using an adhesive, the adhesive is applied uniformly and only in the required amount (thin enough to be the required amount) in order to shorten the working time and ensure the adhesiveness. It is desirable to do. In this case, especially in fixing a seat having a convex portion at the bottom, the adhesive surface itself is small, and the thickness of the adhesive at the bonding portion with the seat is uneven due to application conditions, concrete surface conditions, etc., and the adhesive surface In some cases, the adhesive strength of the seat was not sufficient due to the fact that some parts were difficult to contribute (substantial adhesive area could be reduced). When the washer is fixed using double-sided tape as in this embodiment, a uniform adhesive layer can be laminated in advance, and the thickness of the adhesive layer is unlikely to be uneven. Therefore, sufficient adhesive strength should be exhibited. (Stable fixing of the washer) is considered to be possible. The height Z of the convex portion is, for example, 0.3 mm or more, but the height Z of the convex portion may be 1 mm or more. The upper limit of the height Z is not particularly limited, but is, for example, 3 mm. It should be noted that such a height Z is the height from the reference surface (for example, the brim portion) of the washer.

The specific shape of the convex portion is not particularly limited as long as it forms the convex portion, but for example, a circular shape having a brim (for example, FIG. 4), a concentric circle in which peaks and valleys are repeated {for example, FIG. 5 (1) and (2)}, stepped {for example, FIG. 6 (1)}, mortar-shaped {for example, FIG. 6 (2)} and the like can be mentioned. Further, the convex portion is not limited to a circular shape, and may be an elliptical shape {for example, FIG. 7 (1)}, a polygonal shape such as a triangle or a quadrangle, or a spiral shape.

The specific shape of the washer is not particularly limited, and examples thereof include a circle, an ellipse, a triangle, a quadrangle, a polygon, and a fan. Further, the width and height of the entire washer (including the thickness of the bottom of the washer) may be appropriately set according to the method of use and the like.

A through hole may be provided at the bottom of the washer. The specific shape of the through hole is not particularly limited, and examples thereof include a circular shape {for example, FIG. 7 (2)}, an elliptical shape, a triangle, a quadrangle, a polygon, a fan shape, and the like. Further, the number of such through holes and the like are not particularly limited.

The specific shape of the inlet is not particularly limited, and examples thereof include a circle, an ellipse, a triangle, a quadrangle, a polygon, and a fan. Further, the injection port may not be present in the central portion of the washer, and may be present in the peripheral portion of the washer.

The injection port is a site where the repair material is injected in the injection process described later, but in the stage before the injection process {before fitting (fixing) the special instrument described later}, the inside of the injection port is covered. A shaped portion (stopper) or the like may be provided so that the fluid cannot pass or becomes difficult to pass inside the injection port. When such a lid-shaped portion is provided, the lid-shaped portion is removed before the injection step, and the lid-shaped portion is penetrated by the pressure of the repair material injected into the injection port in the injection step, which will be described later. It can be formed so as not to hinder the injection of the repair material into the injection port by setting the special instrument to be used on the washer so that the lid-like portion is penetrated.

The inside of the injection port may be provided with a step, and the step may be configured so that, for example, a special instrument described later can be fitted (fixed).

The washer and the special instrument described later may be integrally formed. For example, a washer-shaped member may be provided at the bottom of the dedicated instrument.

<Tape for fixing washers>
The washer fixing tape is usually a double-sided tape composed of three layers having a base material layer and adhesive layers provided on both sides of the base material, but the tape is not limited to this, and other layers may be used. You may have. For example, it may be a layer having a plurality of base materials such as a pressure-sensitive adhesive layer / base material layer / pressure-sensitive adhesive layer / base material / pressure-sensitive adhesive layer, or a plurality of double-sided tapes are bonded to increase the thickness of a washer. It may be used as a tape for use, or another base material may be inserted as an intermediate base material between a plurality of double-sided tapes. Here, the washer fixing tape may be a tape composed of only an adhesive layer (without a base material layer). Further, in this case, the washer fixing tape may be a tape composed of only one pressure-sensitive adhesive layer, or may be a tape in which a plurality of pressure-sensitive adhesive layers are laminated. Further, the washer fixing tape may be in a form in which a release liner that protects the adhesive layer is provided before use, and the release liner is peeled off at the time of use. As such a release liner, those used for ordinary adhesive tapes, for example, a silicone-based release liner, a long-chain alkyl-based release liner, a fluorine-based release liner, and the like can be used.

The base material of the washer fixing tape is not particularly limited, and for example, a plastic film, a non-woven fabric, a film cloth, paper, a cloth, a plastic foam, a metal foil, or a composite thereof can be used. The material is not particularly limited, and for example, polyolefins such as polyethylene, polypropylene, ethylene propylene copolymer, ethylene butene-1 copolymer, ethylene octene copolymer, ethylene vinyl acetate copolymer, and ethylene vinyl alcohol copolymer. Systems materials, polyvinyl alcohol materials, acrylic materials such as polymethylmethacrylate, polyester materials such as polyethylene terephthalate and polybutylene terephthalate, polyamide materials such as nylon 6, nylon 6 and 6, zinc, sodium and the like in the structure. Various ionomer materials with metal ions, polystyrene, styrene isoprene copolymers, styrene materials such as styrene butadiene copolymers, polyurethane materials, vinyl chloride materials, fluorine materials, acetate, cellophane and other cellulose materials, rayon , Cotton, etc., aluminum, copper, silver, gold, tin, stainless steel, and other metals, etc., may be used alone or in combination of two or more. The support is not particularly limited, but polyethylene cloth, non-woven fabric, rayon, and plastic foam are preferable.

As the adhesive for the sheet fixing tape, for example, various adhesives such as rubber-based, acrylic-based, urethane-based, silicone-based, polyolefin-based, and ethylene-vinyl acetate copolymer system can be used. Among them, rubber can be used. It is preferable that it is a based pressure-sensitive adhesive, particularly a butyl-based pressure-sensitive adhesive. By using such an adhesive, good adhesive strength is developed regardless of the adherend on both smooth tape surface and uneven concrete surface, so the repair material should be injected without leakage. Is possible.

Further, based on the materials of the washer, the concrete surface, the covering member, etc., different adhesive layers (layers having different materials and thicknesses) are provided on one surface side and the other surface side of the washer fixing tape. May be.

Further, the width and length of the washer fixing tape are not particularly limited, and the shape can be freely designed according to the size and surface shape of the repair target portion, and may be a wide sheet shape or an elongated strip shape. It may be. When the washer fixing tape has an elongated strip shape, it may be wound in a roll shape and stretched at the time of use. Further, as described above, the washer fixing tape may have a shape (for example, a donut shape) in which a portion corresponding to the washer injection port is hollowed out in advance.

The specific shape of the hollowed-out opening of the washer fixing tape is not particularly limited, and examples thereof include a circular shape, an elliptical shape, a triangular shape, a quadrangle, a polygonal system, and a fan.

Here, the total thickness of the washer fixing tape (when a plurality of double-sided tapes are bonded to form a washer fixing tape, the total value of all the thicknesses) is larger than the height Z at the bottom of the washer. It is preferably large, and more preferably 1.2 times or more the height Z. With such a total thickness, the washer can be stably fixed regardless of the shape of the bottom of the washer. In particular, as described above, the washer may have a convex portion having a height Z of 0.3 mm or more at the bottom portion. Even in this case, by configuring the washer fixing tape so that the total thickness is 1.2 times or more the height Z, the step of the convex portion is sufficiently absorbed to prevent leakage of the repair material and to be stable. It is possible to fix the washer.

As a specific thickness of the washer fixing tape, for example, the adhesive layer (one side) is 0.03 mm or more (upper limit is, for example, 3 mm), and the total thickness is 0.4 mm or more (upper limit is, for example, 10 mm). ).

<A particularly preferable combination of washers and washers fixing tape and its application method>
Here, a particularly suitable combination of a washer and a washer fixing tape used in the washer fixing step in order to further improve the effect of the present invention will be described. Here, only the characteristic parts of the washer and the washer fixing tape described above will be described. Therefore, each configuration of the washer and the washer fixing tape described above can be similarly applied to the washer and the washer fixing tape described below as long as there is no particular contradiction.

The combination of the washer and the washer fixing tape that can be particularly preferably used in the washer fixing step has a first form and a second form. Hereinafter, these will be described in more detail.

First Form In the first form, as shown in FIG. 8, the annular convex portion, which is a convex portion forming a ring surrounding the washer injection port, is provided only in the vicinity of the washer injection port at the bottom of the washer. It is provided in. That is, in this embodiment, the injection port is configured to be located in the ring of the annular convex portion when the washer is viewed from the bottom. Further, the annular convex portion is provided in the vicinity of the injection port. Further, when the total thickness of the washer fixing tape is T and the height of the annular convex portion is Z, T> Z is satisfied. The height of the convex portion shown here refers to the deepest point where the adhesive layer of the washer fixing tape comes into contact with the reference plane, and usually indicates the height from the brim portion. It is preferable to have such a brim because the fixing stability of the washer is improved.

Here, in the present invention, the fact that the convex portion constitutes a ring means that the convex portion becomes an annular shape when the top portions (high height portions in the vertical cross section) are connected. Further, the ring or the ring includes an annular ring, an elliptical ring, a ring of a polygon (for example, a triangle or a quadrangle), a ring of a polygon with rounded corners, and the like, and may be any closed shape connected by a straight line or a curve. Just do it. Further, the ring shown here may be regarded as a ring as a whole, and a ring having a notch in a part (for example, a shape such as “C”) may be used as a ring.

Further, here, in the present invention, the fact that the convex portion is present in the vicinity of the injection port indicates that the convex portion is relatively close to the injection port. More specifically, the position where the convex portion is present is preferably a position closer to the edge side of the injection port than the outer peripheral portion of the washer in the bottom view of the washer (in other words, when viewed from the edge side of the injection port). , A position that is less than 1/2 of the distance between the outer peripheral portion of the washer and the edge of the injection port), and more preferably, the outer peripheral portion of the washer and the edge of the injection port when viewed from the edge side of the injection port. It is a position within 1/3 of the distance (particularly preferably within 1/4).

In the first embodiment, the total thickness T of the washer fixing tape is preferably 1.2 times or more the height Z of the washer.

Further, in the first embodiment, as shown in FIG. 9, the washer fixing tape is provided with an opening larger than the annular convex portion so that the annular convex portion exists in the opening (that is, the bottom surface of the washer). It is preferable to attach the washer fixing tape to the washer so that the annular convex portion can be visually recognized from the opening).

In the first embodiment, it is preferable to have only one annular convex portion, but a plurality of annular convex portions may be provided. However, when having one or more annular protrusions, all the annular protrusions need to be present in the vicinity of the injection port. In the first embodiment, the convex portion may be appropriately provided as long as the effect of the invention is not impaired. For example, a convex portion having a height that can be ignored may be provided.

Second Form In the second form, as shown in FIG. 10, the bottom of the washer surrounds the main annular convex portion, which is a convex portion forming a ring surrounding the injection port of the washer, and the main annular convex portion. A sub-annular convex portion is provided. That is, in this embodiment, when the washer is viewed from the bottom, the main annular convex portion is located in the ring of the sub-annular convex portion, and the injection port is located in the ring of the main annular convex portion. Further, the main annular convex portion is provided near the injection port, the total thickness of the washer fixing tape is T, the height of the main annular convex portion is Z ₁ , and the height of the highest convex portion among the sub-annular convex portions. When the value is Z ₂ , Z ₁ > Z ₂ and T> (Z _1-1 to Z ₂ ) are satisfied.

Although this figure illustrates a form in which there is only one sub-annular convex portion, there may be two or more sub-annular convex portions.

In the second embodiment, the total thickness T of the washer fixing tape is preferably 1.2 times or more that of (Z _1-1 to Z ₂ ).

In the second embodiment, the washer may or may not have a brim.

Further, in the first embodiment, as shown in FIG. 11, the washer fixing tape is provided with an opening larger than the main annular convex portion so that the main annular convex portion exists in the opening (that is, the washer). It is preferable to attach the washer fixing tape to the washer so that the main annular convex portion can be seen from the opening in the bottom view of the washer. At this time, the sub-annular convex portion may be covered with a washer fixing tape.

<< Injection process >>
Next, the repair material is injected into the repair target site through the washer injection port. Such an injection method can be carried out by a known method, and examples thereof include the following low-pressure injection repair method, but the injection method is not particularly limited, and the injection method to the washer injection port is a grease pump, a foot injector, or the like. It may be another injector such as an electric injector, or it may be a high pressure injection. Here, a case where the adhesive tape coating step (attachment of the adhesive tape for coating) is performed as the coating step, then the washer fixing step is performed, and then the injection step is performed will be described as an example.

First, a repair material is filled in a special instrument (plug) including a mechanism such as a cylinder, a piston, and a discharge port.

Next, a special instrument is set in the washer so that the injection port of the washer and the discharge port of the special instrument can conduct fluid.

Next, by discharging the repair material from the dedicated instrument, the repair material passes through the injection port of the washer, and the repair material is injected into the repair target site {FIGS. 12 (a) and 12 (b)}. In this case, for example, the pressure at the time of injecting the repair material can be changed by applying an adjusted load to the cylinder portion using rubber or the like or a weight.

Finally, the special equipment is removed, and the repair material is cured by curing for an appropriate period of time. The curing time can be appropriately changed depending on the material of the repair material, the properties of the concrete surface, the curing conditions (humidity, temperature, weather, etc.) and the like.

Here, examples of the repair material include an epoxy resin-based repair material conforming to JIS A 6024 and an acrylic resin-based repair material, but the repair material is not particularly limited to these resins, and epoxy emulsions and modified acrylics are used. Resin, acrylic emulsion, acrylic acid ester peroxide, mortar resin, polymer cement, lithium nitrite-containing mortar, sodium silicate-based lithium, water glass, silica sol, blast furnace slag-based suspension, polyurethane resin, polyurethane-based sealing material, It may be a silicone-based sealing material, a modified silicone-based sealing material, or the like.

<< 4. Post-treatment process >>
The post-treatment step is a step of removing the covering member after the repair step. For example, the covering member may be peeled off from the repair target portion and removed while the washer and the special instrument are still on the surface (FIG. 13). Further, if necessary, as a post-treatment step, the repair material protruding from the repair target portion may be polished with a disc sander, a scraper, or the like to make a smooth surface, or may be washed with water or an organic solvent.

The working time required for these series of steps varies depending on the presence or absence of the repair material and the covering step, but is, for example, about 25 hours (spring to autumn) to 49 hours (winter).

As described above, according to the repair method according to this embodiment, the work is simplified and efficient, and the washer can be securely fixed, so that it can be applied to the repair of all repair target parts on the concrete surface. It is possible.

Here, the "concrete surface" is not limited to any surface formed by concrete and mortar, and may be composed of not only a flat surface but also a curved surface, an uneven surface, or the like. Further, the concrete surface may extend in any of the vertical direction, the horizontal direction, and the inclined direction, and may extend to a general building (for example, a house, a building, a dam, a bridge, etc.), a road, or the like. Indicates any concrete surface such as an electric pole, concrete block, concrete panel, etc. (For example, in a house, all surfaces formed by concrete and mortar, such as walls, rooftops, roofs, floors, pillars, etc. included). The concrete and mortar materials that form the concrete surface are not limited, and are not limited to cement concrete, asphalt concrete, polymer concrete, crushed stone concrete, fluidized concrete, high-strength concrete, high-fluidity concrete, expanded concrete, fibrous reinforced concrete, and lightweight. It may be any known concrete and mortar material, such as concrete, heavy concrete and the like.

Hereinafter, the concrete surface repair method of the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited thereto.

The parts to be repaired (cracks) on the concrete plate were evaluated by the following method.

First, the 70 mm x 150 mm surface of the mortar panel (70 mm x 150 mm x 10 mm) is polished to a surface roughness Ra: 5 to 6 μm with a disc sander, and an adhesive tape for coating (Sekotan _TM CS-5010, Nichiban) is placed on the surface. (Made by Co., Ltd.) is attached. In Example 1, the adhesive tape for coating was not attached.
Next, the injection washer of the bond cylinder set (manufactured by Konishi Co., Ltd.) was fixed with each adhesive tape (adhesive tape shown in Tables 1 and 2) (see FIG. 14).
Next, put 30 mL of epoxy resin repair material (Bond E206S, manufactured by Konishi Co., Ltd.) into the cylinder, connect the cylinder and the injection washer with two rubber bands, and apply low pressure (repair material injection pressure 0.07 MPa). An injection test was performed.
If the repair material flows out between the washer and each adhesive tape or from each layer of the adhesive tape within 30 minutes, x is used, and if there is no outflow, ○ is used.

The tapes and evaluation results used in each Example and Comparative Example are shown in Tables 1 and 2.

The method of adjusting the washer fixing tape used in Examples 1, 2 and 3 is as follows.
100 parts by weight of butyl rubber was put into a heated kneader heated to 150 ° C., and 80 parts by weight of calcium carbonate was put and kneaded. To 100 parts by weight of the butyl rubber pound, 45 parts by weight of petroleum resin, 66 parts by weight of process oil, 0.03 part by weight of p-quinonedioxime vulcanizer, and 6 parts by weight of phenolic antiaging agent were added and kneaded. While cross-linking. Then, it was taken out from the kneader and the pressure-sensitive adhesive composition was adjusted.
Next, this pressure-sensitive adhesive composition is heat-coated (thickness 0.4 mm) on a release liner at 100 ° C. on a calendar, bonded to polyethylene cloth (thickness 0.2 mm), and further on the above-mentioned release paper. The butyl rubber pressure-sensitive adhesive coated on the calendar was laminated on the pressure-sensitive adhesive surface to prepare a butyl rubber double-sided adhesive tape having a thickness of 1 mm.

In Example 1, the adhesive tape was attached to three sheets (total thickness 3 mm) using the above-mentioned butyl rubber double-sided adhesive tape, and a washer having an annular convex portion height Z1 mm was fixed. In Example 1, the washer was directly fixed to the mortar plate with the adhesive tape without the coating treatment, and the injection test was performed without taking the curing time of the adhesive tape, but the repair material did not flow out and the result was good. rice field.

In the examples after Example 2, the injection test was carried out after the coating treatment was performed with the adhesive tape for coating. For Examples 2 and 3, the same adhesive tape and washer as in Example 1 were used. In Example 2, three adhesive tapes (total thickness 3 mm) were bonded together, and in Example 3, two sheets (total thickness 2 mm) were bonded to fix the washer, and both gave good results.

The method of adjusting the washer fixing tape used in Examples 4 and 5 is as follows.
Polymerization was carried out at 70 ° C. for 8 hours by a conventional method using 90 parts of butyl acrylate / 8 parts of methyl methacrylate / 2 parts of acrylic acid / 0.2 parts of azobisisobutyronitrile / 150 parts of ethyl acetate. To the obtained reaction solution, 0.1 part of an epoxy-based cross-linking agent (Tetrad X) was added per 100 parts of the copolymer to obtain an adhesive, and the adhesive was applied to a release liner (0.03 mm thick after heating and drying). ), The non-woven fabric base material was bonded, and the above acrylic pressure-sensitive adhesive was further applied onto it (0.03 mm thick after drying) to obtain an acrylic double-sided pressure-sensitive adhesive tape having a thickness of 0.16 mm.

For Example 4, the adhesive tape was attached to eight sheets (total thickness 1.28 mm) using the acrylic double-sided adhesive tape, and the same test as in Example 2 was performed, but good results were obtained.

For Example 5, an injection test was carried out using a washer having an annular convex portion height Z of 0.3 mm after coating with an adhesive tape for coating. In Example 5, the acrylic double-sided adhesive tape was used, and three sheets (total thickness 0.48 mm) of the adhesive tape were bonded to each other to fix the washer, and good results were obtained.

For Example 6, the same test as in Example 5 was performed using the adhesive tape of Example 2 (total thickness 1 mm), and good results were obtained.

For Examples 7 and 8, the same test as in Example 2 was carried out by using the butyl rubber double-sided tape of Example 2 and inserting and laminating a plastic foam as an intermediate base material between the two adhesive tapes. .. In Example 7, an independent foam plastic foam having a thickness of 1 mm (Toray Pef, foam magnification 10 times, manufactured by Toray Industries, Inc.) was inserted and bonded (total thickness 3 mm), and in Example 8, an independent foam having a thickness of 2 mm was inserted and bonded. The washer was fixed using a foamed plastic foam (Toray Pef, foaming magnification 10 times, manufactured by Toray Industries, Inc.) inserted and bonded (total thickness 4 mm), and both gave good results.

For Comparative Example 1, after coating with an adhesive tape for coating, the same adhesive tape as in Example 2 was used, and a washer having an annular convex portion height Z1 mm was fixed with one of the adhesive tapes (total thickness 1 mm). However, since the thickness of the adhesive tape did not exceed the height Z of the annular convex portion, the repair material flowed out and was rejected.

As shown in Table 1, according to the repair method according to the present invention, while preventing leakage of the repair material, there is no pot life unlike the fast-curing adhesive, and there are also compounding errors and uneven thickness during application. It can be seen that the work can be simplified and streamlined, and the washer can be securely fixed.

For Comparative Examples 2 to 4, after the coating treatment was performed with the adhesive tape for coating, an adhesive was used to fix the washer, and the washer having the height of the annular convex portion Z1 mm was fixed. As a reference example, it was confirmed in the preliminary test that when the adhesive of 0.06 g / cm ² was applied and cured for 15 minutes and then the injection test was performed, there was no outflow of the repair material and the results were good. For Comparative Example 2, an injection test was conducted after applying an adhesive of 0.04 g / cm ² and curing for 15 minutes, but the repair material flowed out due to the small amount of the adhesive applied, and the test was rejected. .. For Comparative Examples 3 and 4, an adhesive of 0.06 g / cm ² was applied, and the injection test was performed after curing for 10 minutes for Comparative Example 3 and 5 minutes for Comparative Example 4, but repaired because the curing time was short. A material spill occurred and the product was rejected.

Claims (5)

It is a low-pressure injection repair method that repairs the concrete surface by injecting a repair material into the part to be repaired on the concrete surface.
A washer fixing step of fixing a washer having an injection port to a concrete surface via a washer fixing tape having an adhesive layer on both sides, and the repair to the repair target portion of the concrete surface via the injection port. Including the injection process of injecting the material
A low-pressure injection repair method comprising satisfying either (I) or (II) below .
(I) The bottom portion is provided with an annular convex portion which is a convex portion forming a ring surrounding the injection port, and the annular convex portion is provided only in the vicinity of the injection port for fixing the washer. When the total thickness of the tape is T and the height of the annular convex portion is Z, T> Z is satisfied.
(II) The bottom portion is provided with a main annular convex portion which is a convex portion forming a ring surrounding the injection port, and one or a plurality of sub-annular convex portions surrounding the main annular convex portion. The main annular convex portion is provided in the vicinity of the injection port, the total thickness of the washer fixing tape is T, the height of the main annular convex portion is Z ₁ , and the highest among the sub-annular convex portions. When the height of the convex portion is Z ₂ , Z ₁ > Z ₂ and T> (Z ₁ to Z ₂ ) are satisfied. However, the washer fixing tape is provided with an opening larger than the main annular convex portion so that the main annular convex portion exists in the opening and the sub-annular convex portion is the washer fixing tape. The washer fixing tape is attached to the bottom of the washer so as to be covered. The low-pressure injection repair method according to claim 1 , wherein any of the following (IA) or (IIA) is satisfied.
(IA) The total thickness T of the washer fixing tape is 1.2 times or more the height Z.
(IIA) The total thickness T of the washer fixing tape is _1.2 times or more that of Z1 _- Z2. However, the washer fixing tape is provided with an opening larger than the main annular convex portion so that the main annular convex portion exists in the opening and the sub-annular convex portion is the washer fixing tape. The washer fixing tape is attached to the bottom of the washer so as to be covered. The low-pressure injection repair method according to claim 1 or 2 , wherein the washer fixing tape has an adhesive layer made of a butyl adhesive. Prior to the washer fixing step, a covering step of covering the repair target portion with a covering member is further provided.
The low-pressure injection repair method according to any one of claims 1 to 3 , wherein the covering member is an adhesive tape. A washer fixing tape having an adhesive layer on both sides, which is used in the low-pressure injection repair method according to any one of claims 1 to 4 .

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