JP2018127843A - Exfoliation preventing sheet, exfoliation preventing method and repairing method of exfoliation prevention - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an exfoliation preventing sheet which can improve the workability and repairability by reducing the thickness of the entire sheet, and can also prevent falling of small pieces of 10 mm or less, and an exfoliation preventing method and a repairing method of exfoliation prevention.SOLUTION: An exfoliation preventing sheet 1 adhered to a surface of a structure (RC) having a water absorptive inorganic material to prevent exfoliation of an exfoliated material from the surface has a two-layer structure including a fibrous base material 2 having a predetermined strength for suppressing falling of the exfoliated material and a weather resistant film 3 which is bonded with a laminate adhesive 4 impregnated in the fibrous base material and blocks ultraviolet rays to improve weather resistance. The fibrous base material 2 is made of canvas in which warps and wefts consisting of twisted yarns in which a plurality of original yarns having a predetermined thickness of natural fibers or synthetic fibers are twisted are plain woven.SELECTED DRAWING: Figure 2

Description

  The present invention provides an anti-peeling method that prevents a fallen piece such as a concrete piece from being peeled off by adhering and covering the surface of a structure having a water-absorbing inorganic material surface such as a reinforced concrete structure. The present invention relates to a sheet, a peeling prevention construction method, and a peeling prevention re-repair construction method.

  Structures with internally reinforced reinforcing bars such as reinforced concrete structures are covered with carbon dioxide and chloride ions from cracks, etc. due to neutralization and salt damage, and the internally reinforced reinforcing bars corrode and expand, causing concrete fragments in the cover part. There was a problem that peeled off and dropped. Moreover, there was a possibility that the concrete piece would peel off due to the expansion of the aggregate or the like even if the alkali aggregate reaction or construction was poor. In addition to the reinforced concrete structures such as reinforced concrete tunnels and bridges, this problem of peeling is caused by the surface of strongly water-absorbing inorganic materials such as mortar, blocks, bricks, etc. that may fall off the surface. It was also a problem common to the structures it had.

  For this reason, conventionally, there is provided a stripping prevention sheet made of a fiber base material having a strength for suppressing falling of the stripped material on the surface of the structure having a water-absorbing inorganic material surface such as a reinforced concrete structure and an adhesive resin as a binder. A peeling prevention sheet for preventing a concrete piece or the like from being peeled off from a structure by bonding with an adhesive and a peeling prevention method using the same are known.

  As this type of anti-peeling sheet and anti-peeling method, for example, Patent Document 1 proposes an adhesive layer proposed by the applicants of the present application, which is integrated with an adhesive and adhered to a concrete structure, and weather resistance. A three-layer structure having a protective layer that protects the adhesive and the adhesive layer and a reinforcing layer made of a triaxial mesh fiber base material that increases the physical strength between the protective layer and the adhesive layer. A sheet for repairing / reinforcing a concrete structure made of a laminate and capable of shortening the number of work days by omitting the application step of the weather-resistant paint, etc. is disclosed (Claims of Claims of Patent Document 1) 1-5, paragraphs [0034]-[0047] of the specification, FIG.

  Patent Document 2 discloses a fiber sheet 1 made of an FRP sheet having flexibility at room temperature, which is solidified and integrated with a transparent or translucent base resin 3 around a triaxial mesh fiber base 2. And a fiber sheet bonding method using the fiber sheet 1 is disclosed (claim 1 of patent document 2, paragraphs [0028] to [0037] of the specification, FIG. 1 of the drawings, FIG. 3 etc.).

  However, the conventional peeling prevention sheet described in Patent Documents 1 and 2 uses a triaxial mesh vinylon fiber as a fiber base material. Therefore, although it has high tensile strength and excellent peeling resistance, small pieces of peeled pieces fall off from the openings of the mesh-like vinylon fibers when concrete pieces, etc. peel from the structure. There was a problem that there was a fear of anxiety to a third party passing under the structure.

  In addition, if a protective layer is provided on the surface to improve the weather resistance, a new anti-peeling sheet can be attached to the surface if the existing anti-peeling sheet or protective layer is not peeled off when repairs are necessary. There was a problem that could not be done.

  In addition, since the triaxial mesh-like vinylon fiber intersects the three axes at a single point, in order to ensure a predetermined strength, the fiber base material becomes thick due to the influence of the intersecting portion, and inevitably the entire sheet. Thickness increases. In particular, in the repair / reinforcing sheet described in Patent Document 1 having a three-layer structure, the problem is that the thickness of the entire sheet is thick, it is difficult to bend at the overlap, and the workability is poor.

  In addition, in order to improve the workability of sticking of the peeling prevention sheet while ensuring the fall prevention function of the peeling object, the binder resin is flexible at room temperature as in the fiber sheet described in Patent Document 2. In order to improve the impregnation property with the fiber base material, it has been necessary to perform surface modification treatment by corona discharge treatment or plasma treatment. For this reason, there also existed a problem that the manufacturing cost of sheet | seat itself became high.

  Further, in Patent Document 3, a concrete repair sheet having an intermediate layer having a resin film and a surface layer made of a fabric material laminated on both sides of the resin film via an adhesive resin is applied to the concrete surface to be repaired. A concrete repair method in which a paint is applied to a surface layer opposite to the concrete surface of the applied concrete repair sheet, and a concrete repair sheet in which the resin film is a carbon dioxide gas barrier film is disclosed. (See claim 1 of claim 3 of patent document 3, paragraphs [0017] to [0029] of the specification, FIG. 1 of the drawings, etc.).

  However, in the repair sheet and the repair method described in Patent Document 3, the paint is applied on the repair sheet in order to perform the construction quickly. It is necessary to take a bonding allowance that extends not only to the part but also to the surrounding repair sheet. For this reason, there was a problem that a desired adhesive force could not be obtained by the top coating applied on the repair sheet. Therefore, it may be possible to roughen the overcoat on the existing repair sheet in the surrounding area, but there is a risk that the existing repair sheet may be damaged in the case of roughing, and the workability may be significantly degraded. To do. In addition, since the work of applying the paint on the repair sheet is an on-site work that affects the quality due to the weather, the barrier function against the aforementioned ultraviolet rays, salt damage, and neutralization may be inferior to the factory product.

JP 2002-256707 A JP 2009-162033 A JP 2010-144360 A

  Therefore, the present invention has been devised in view of the above-mentioned problems, and the object of the present invention is to reduce the thickness of the entire sheet and improve workability and repairability, and can be 10 mm or less. An object of the present invention is to provide a peeling prevention sheet, a peeling prevention construction method, and a peeling prevention re-repair construction method that can prevent a small piece from falling.

  The exfoliation preventing sheet according to the first aspect of the present invention is an exfoliation preventing sheet that is adhered to the surface of a structure having a water-absorbing inorganic material and prevents exfoliation of the exfoliation from the surface. A fiber base material having a predetermined strength, and a weather resistant film which is bonded with a laminate adhesive impregnated in the fiber base material and shields ultraviolet rays to improve the weather resistance. The material is characterized in that it is a canvas in which warps and wefts made of twisted yarns in which a plurality of yarns of a predetermined thickness of natural fibers or synthetic fibers are twisted are plain woven.

The peeling prevention sheet according to a second aspect of the present invention is the first aspect of the present invention, wherein the canvas is made of a raw yarn of 130.8 tex or less (tex) or less, and the basis weight is 412 g / m ² or less by adjusting the number of driven vertical wefts. It is characterized by becoming.

  The peeling prevention sheet according to a third aspect of the invention is characterized in that, in the first aspect or the second aspect, the weather resistant film is made of a polyvinyl fluoride resin.

  The peeling prevention method according to the fourth aspect of the invention is to prevent the fallen material from peeling off from the surface by adhering the peeling prevention sheet according to any one of claims 1 to 3 to the surface of the structure having the water-absorbing inorganic material. An anti-peeling method, an adhesive application step for applying a time-curing adhesive for sheet adhesion to the surface of the structure, and a sheet sticking step for attaching the anti-peeling sheet on the adhesive for sheet bonding And after the sheet sticking step is completed, the sheet adhesive can be cured without slipping even if the sheet is not held on the sheet adhesive for a certain period of time. It is characterized by.

  In the fourth invention, the peeling prevention method according to the fifth invention is a method of attaching a protective film made of a resin film on the weather resistant film of the peeling prevention sheet before the sheet sticking step, and after the sheet sticking step is finished. The protective film is removed by removing the protective film from the weather-resistant film.

  The peeling prevention re-repair method according to the sixth aspect of the present invention provides a method for further repairing a structure having a surface to which the peeling prevention sheet according to claim 3 is adhered by further bonding the peeling prevention sheet after the repair. It is a peeling prevention re-repair method that prevents the peeled material from peeling off, without applying a roughening step that damages the weather resistant film, and applying an adhesive for sheet adhesion on the weather resistant film, Further another anti-peeling sheet is stuck on the anti-peeling sheet.

  According to 1st invention-5th invention, it is a two-layer structure of a fiber base material and a weather-resistant film, and the warp yarn and the weft which a fiber base material consists of the twisted yarn by which several original yarns of predetermined thickness were twisted together Since it consists of a plain woven canvas, the thickness of the whole sheet can be reduced and workability and repairability can be improved.

  In addition, according to the first to fifth inventions, since the fiber base material is a plain woven canvas instead of a mesh-like one, the fall of small pieces such as a concrete piece of 10 mm or less which causes human damage by dropping is prevented. And there is no fear of anxiety to a third party passing under the structure.

  In addition, according to the first to fifth inventions, the fiber base material is composed of a twisted yarn in which a plurality of thin raw yarns are twisted together. Impregnation between the base material and the laminate adhesive is improved, and a two-layer structure of a fiber base material and a weather resistant film becomes possible. For this reason, the workability which affixes a peeling prevention sheet to a structure improves, and construction cost can be reduced.

In particular, according to the second invention, the fabric base fabric is made of a raw yarn of 130.8 tex or less, and the basis weight is reduced to 412 g / m ² or less by adjusting the longitudinal weaving book. Therefore, the whole peeling prevention sheet can be made thinner, while exhibiting various functions required for the peeling prevention sheet including a predetermined strength for suppressing the fall of the fallen objects. For this reason, the workability which affixes a peeling prevention sheet to a structure can further be improved, and construction cost can be reduced.

  In particular, according to the third and sixth inventions, the weather-resistant film is made of a polyvinyl fluoride resin, so that it exhibits an excellent ultraviolet blocking effect and antifouling property and has good adhesion to the adhesive for sheet adhesion. It becomes. For this reason, it is possible not only to perform a roughening process, but also to attach another anti-peeling sheet on the anti-peeling sheet, and to improve the workability at the time of repair. For this reason, the construction cost at the time of re-repair can be reduced.

  In particular, according to the fourth aspect of the present invention, since the adhesive agent for sheet curing is cured without displacing the anti-peeling sheet even if the anti-peeling sheet is not held on the adhesive for sheet adhesion for a certain period of time, It is possible to reduce the construction cost by improving the workability to be attached to the sheet.

  In particular, according to the fifth invention, after the sheet sticking step is completed, the protective film is peeled off from the weather resistant film and removed, so that the adhesive is accidentally attached to the weather resistant film, etc. It is possible to prevent the peeling prevention sheet from becoming dirty during the pasting operation.

It is sectional drawing which shows the structure of the peeling prevention sheet which concerns on embodiment of this invention. It is sectional drawing which shows the state which adhere | attached the peeling prevention sheet which concerns on embodiment same as the above to a structure. It is an enlarged photograph which shows the fiber base material which concerns on this embodiment, (a) is expanded 100 times, (b) is expanded 150 times. It is a flowchart which shows each process of the peeling prevention construction method concerning embodiment of this invention in contrast with the conventional construction method. It is a flowchart which shows each process of the peeling prevention re-repair construction method which concerns on embodiment of this invention. It is a photograph which shows the specimen destruction condition after an overlay condition adhesion test.

  Hereinafter, a peeling prevention sheet and a peeling prevention construction method according to an embodiment of the present invention will be described with reference to the drawings.

[Peeling prevention sheet]
First, the peeling prevention sheet which concerns on embodiment of this invention is demonstrated using FIGS. 1-3. The peeling prevention sheet according to the present invention can be applied to a structure having a water-absorbing inorganic material surface, but the concrete piece is peeled off by adhering to the reinforced concrete structure RC as the structure according to the embodiment of the present invention. An example of preventing this will be described.

  FIG. 1 is a cross-sectional view showing a configuration of a peeling prevention sheet according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view showing a state in which the peeling prevention sheet is completely bonded to a reinforced concrete structure. As shown in FIGS. 1 and 2, the anti-peeling sheet 1 according to the embodiment of the present invention is a fiber base material 2 from the inner side which is the side to be attached to a structure. It is a rectangular sheet-like surface covering material having a two-layer structure in which the second layer on the outside is the weather resistant film 3. This peeling prevention sheet 1 has a function of adhering to and covering the surface of a reinforced concrete structure RC, which is a structure, and preventing the concrete pieces from peeling off from the surface.

(First layer: fiber substrate)
The fiber base material which concerns on this invention is a fiber base material which has the predetermined intensity | strength for preventing peeling. Specifically, the specified strength is the “Peeling test method for surface coating material (draft) applied to prevent flaking of concrete pieces (draft)” (JSCE-K 533-2010), which is the standard of the Japan Society of Civil Engineers. Based on the above, in the push-out test adopted by the former Highway Public Corporation (NEXCO), it means that 1.5kN or more is satisfied.

  Moreover, it is required that the concrete piece to be peeled off can be held even if the displacement of the concrete surface caused by the corrosion expansion pressure of the steel material is about 10 mm. In addition, in order to prevent the repair range from being excessively constrained and to easily find the deformed portion at the time of inspection, it is required that the displacement be 10 mm or more and satisfy 1.5 kN or more.

  FIG. 3 is an enlarged photograph showing the fiber substrate 2 according to the present embodiment. The fiber base material 2 according to the embodiment of the present invention has a predetermined strength for preventing peeling, and a plurality of raw yarns of a predetermined thickness of natural fibers or synthetic fibers are twisted together as shown in FIG. A canvas in which warps and wefts made of twisted yarns are plain woven.

  As shown in FIG. 3, the fiber base material 2 is necessary for one raw yarn while ensuring the necessary strength to prevent peeling by plain weaving warps and wefts composed of twisted yarns obtained by twisting a plurality of raw yarns. Strength can be reduced. For this reason, compared with the conventional triaxial mesh-like fiber, one point crossing of the three axes can be avoided, the thickness of one raw yarn can be reduced, and the required thickness of the fiber substrate 2 can be reduced. A flexible fiber base that can be easily bent can be obtained.

  Moreover, since the warp and weft of the fiber base material 2 are composed of a plurality of fibers, compared to the conventional triaxial mesh fiber, even when a stress exceeding the allowable stress is applied, the fiber base 2 has high toughness without disconnection at a time. It shows rupture properties and can prevent major accidents of large-scale collapse.

  Furthermore, since the fiber base material 2 consists of the twisted yarn twisted together, it can improve intensity | strength and toughness rather than what was bundled in multiple numbers. Further, by twisting, fine gaps are increased, and the laminating adhesive and the adhesive for sheet adhesion and the impregnation property are also improved by capillary action.

  In addition, since the fiber base material 2 is not a mesh but is plain woven, compared to the conventional triaxial mesh fiber opening of about 10 mm, there is almost no opening, such as a small piece of concrete. Almost no powdered fallen material can pass through. For this reason, there is no possibility of giving anxiety to the third party who passes under the reinforced concrete structure RC (see FIG. 1).

In addition, although there are various canvases, the fiber base material 2 according to the embodiment of the present invention has a predetermined strength and is composed of a raw yarn of 130.8 tex (tex) or less and has a warp (vertical x A canvas having a basis weight of 412 g / m ² or less by adjusting the horizontal book is preferred. This is because if the rigidity of the canvas is too high, there is a possibility that a floating part will appear if it is simply pasted with an adhesive resin. However, in consideration of workability, the fiber base material 2 uses 30 to 60 tex raw yarn, and the number of driven yarns is vertical (vertical) 40 to 50 / inch, and horizontal (weft) 35 to 45. it is more preferable that the thickness of the basis weight by adjusting the present / inch became 100g / m ² ~240g / m ² is a canvas of about 0.3Mm～0.4Mm (fabric). While ensuring the necessary strength to prevent peeling, the required thickness of the fiber base 2 can be further reduced by further reducing the predetermined thickness of one yarn, and the efficiency of the pasting operation can be improved. This is because flexibility is obtained.

(Second layer: Weather-resistant film)
The weather resistant film 3 is mainly used to improve the weather resistance (ultraviolet resistance) of the fiber substrate 2 in order to block the ultraviolet rays and prevent the fiber substrate 2 and the adhesive from being deteriorated by ultraviolet rays. It is the resin film provided in the outer side (side away from the surface of the reinforced concrete structure RC). This weather-resistant film 3 is produced in advance at a factory or the like by previously applying a weather-resistant paint by applying it at the construction site, thereby reducing the work days (working time) of the field work and improving the quality. The purpose is to improve the uniformity (see also FIG. 4).

Of course, it is preferable that the weather resistant film 3 not only blocks ultraviolet rays but also has other weather resistance, antifouling properties, waterproof properties, and salt shielding properties. For example, from the viewpoint of preventing salt damage, the weather resistant film 3 preferably has a chloride ion permeation rate of 0.005 g / m ² · day or less. Further, from the viewpoint of preventing rust of the internally reinforced steel material, it is preferable that the oxygen transmission rate is 5.0 × 10 ⁻² mg / cm ² · day or less and the water vapor transmission rate is 5.0 mg / cm ² · day or less. Furthermore, from the standpoint of preventing neutralization, neutralization was conducted in a 30-day neutralization prevention test in accordance with the quality standard test method for concrete coating materials (JHS417-1999) for the construction and management of the former Highway Public Corporation (NEXCO). The formation depth is desirably 1 mm or less.

  As a composition of the weather-resistant film 3, the resin film which consists of a fluororesin, an acrylic resin, an acrylic silicone resin, an acrylic fluorine resin, a silicone resin, a urethane resin, a chlorine resin, or a mixture thereof is mentioned. . It is also possible to laminate a plurality of resin films.

  However, the weather resistant film 3 according to the present embodiment employs a resin film made of a polyvinyl fluoride resin. The resin film made of polyvinyl fluoride resin not only exhibits high weather resistance, but also satisfies all the above-mentioned criteria of chloride ion permeation amount, oxygen permeation amount, water vapor permeation amount, and neutralization prevention test, as well as UV resistance. This is because the performance and antifouling performance are also excellent.

  Furthermore, as the weather resistant film 3, a Tedlar (registered trademark) PVF manufactured by DuPont, which has been surface treated by chemical treatment or radiation irradiation to improve adhesion with an adhesive such as epoxy resin or urethane adhesive, etc. A (polyvinyl fluoride) film is preferred. DuPont's Tedlar (registered trademark) PVF film not only exhibits the functions described above, but also has high weather resistance and mechanical strength, and includes urethane adhesives such as laminate adhesives and sheet adhesives described below. This is because the adhesiveness with the epoxy resin is good. For this reason, it becomes possible to stick another anti-peeling sheet 1 on the anti-peeling sheet 1 without performing a roughening process that damages the weather-resistant film, thereby improving the workability during re-repair and the like. .

(Laminate adhesive)
And this weather-resistant film 3 is adhere | attached on the fiber base material 2 with the laminate adhesive 4 (refer FIG. 1, FIG. 2). The laminate adhesive 4 according to the present embodiment employs a urethane two-component adhesive that is used by mixing the main material and the curing material immediately before use. Of course, the laminate adhesive according to the present invention may be not only a urethane two-component adhesive but also other resin adhesives such as epoxy resins. In short, the laminate adhesive according to the present invention is not particularly limited as long as it is a resin that can be laminated by bonding a weather resistant film and a fiber base material.

(Protective film)
In addition, as shown in FIG. 1, a protective film 5 is attached to the outside of the peeling prevention sheet 1, that is, outside the weather resistant film 3 in order to prevent contamination during transportation to the construction site and during work. It is worn. The protective film 5 is attached to the weather resistant film 3 and the fiber substrate 2 through a slightly adhesive resin layer (not shown) such as an acrylic resin-based resin printed in sparse dots, and is easy to peel off. It has become.

  As a composition of the protective film 5 which concerns on this embodiment, the resin film which consists of polyester resins, such as a polyethylene terephthalate (PET) resin, is employ | adopted. As the protective film, a resin film made of a polyamide resin, a polyethylene resin, or a polyolefin-based resin may be employed. Of course, the protective film is not essential and can be omitted.

(Sheet adhesive)
A two-pack type epoxy resin adhesive is employed for the sheet bonding adhesive 6 for bonding the anti-peeling sheet 1 according to the embodiment described above to the reinforced concrete structure RC. This is because the two-pack type epoxy resin adhesive exhibits high resistance to alkalinity, has a predetermined viscosity like a grease, has appropriate thixotropic properties, and is excellent in workability. Of course, the adhesive for sheet bonding is not particularly limited as long as it is resistant to the strong alkalinity of the reinforced concrete structure RC and the fiber substrate 2 made of canvas is highly impregnated. However, in order not to hold for a certain period of time as in the case of a conventional ultraviolet curable adhesive, the adhesive for sheet adhesion is a grease-like state that can be held until the above-described peeling prevention sheet 1 is cured. It is desirable to have a predetermined viscosity of

  Specifically, the adhesive for sheet bonding includes epoxy adhesive, urethane adhesive, silicone adhesive, acrylic adhesive, polymer cement adhesive, vinyl ester adhesive, polyester adhesive, A polyolefin-based adhesive can be employed.

[Peeling prevention method]
Next, the peeling prevention construction method according to the embodiment of the present invention will be described with reference to FIG. FIG. 4 is a flowchart showing the steps of the peeling prevention method according to the embodiment of the present invention in comparison with the conventional method.

  The structure to which the peeling prevention method according to the present invention can be applied is a concrete structure, a structure whose surface is made of mortar, a brick structure or a block structure. In short, the peeling prevention method according to the present invention can be applied to a structure having a water-absorbing inorganic material on the surface. Specifically, the peeling prevention method according to the present invention can be suitably applied to the surface of a reinforced concrete structure such as a tunnel of a railway or a highway, a wall surface of a lower structure of a bridge, and a lower surface of a main girder of a bridge. As shown in FIGS. 1 to 3, the case where the above-described peeling prevention sheet 1 is bonded to a reinforced concrete structure RC assuming a main girder of a bridge will be described as an example.

(1) Ground Treatment Step First, as shown in FIG. 4, in the peeling prevention method according to the present embodiment, the surface of the reinforced concrete structure RC, which is the construction range of the peeling prevention work, is grounded in the same manner as the conventional peeling prevention method. A ground processing step for performing the processing is performed.

  In this step, a protrusion protruding from the surface of the reinforced concrete structure RC is scraped off and smoothed using a disk sander (rotary cutting grindstone) or the like. If there is a cross-sectional defect on the surface of the reinforced concrete structure RC, it is repaired by filling it with mortar or putty, etc., and if necessary, water leakage treatment is also performed at the water leakage point.

(2) Primer application process Next, as shown in FIG. 4, in the peeling prevention method according to the present embodiment, the adhesion to the surface of the reinforced concrete structure RC smoothed in the previous process is the same as in the conventional peeling prevention method. A primer application step for applying a primer for improving the viscosity is performed.

  The primer applied in this process uses a two-component solvent-free epoxy resin primer that has excellent adhesion to concrete wet surfaces and steel, as well as extremely low viscosity and excellent impregnation into fine cracks of 0.2 mm or less. To do. Of course, it goes without saying that the type of primer to be applied may be appropriately selected according to the material of the surface of the structure. In short, the primer may be any primer that can improve the adhesion of the structure surface.

(3) Adhesive Application Step Next, as shown in FIG. 4, in the peeling prevention method according to the present embodiment, the above-mentioned adhesive 6 for sheet adhesion is applied to the surface of the reinforced concrete structure RC applied with the primer in the previous step. An adhesive coating process is performed to coat the film.

  In this process, the main agent and the curing agent of the sheet adhesive 6 are mixed and stirred with a stirrer or the like until they are uniform, and a sheet-like adhesive 6 having a predetermined grease-like viscosity is created. To do. And it apply | coats on the surface of the reinforced concrete structure RC so that it may become uniform thickness with a brush, a wrinkle, etc. (or a roller) within a pot life (refer also FIG. 2).

(4) Sheet Affixing Step Next, as shown in FIG. 4, in the peeling prevention method according to the present embodiment, the above-described peeling prevention is applied to the surface of the reinforced concrete structure RC to which the sheet bonding adhesive 6 is applied in the previous step. A sheet sticking step for sticking the sheet 1 is performed.

  In this step, first, the peeling prevention sheet 1 is pressure-bonded to the sheet bonding adhesive 6 so that the fiber base material 2 side is the inside (reinforced concrete structure RC side) (see also FIG. 2). At this time, since the adhesive 6 for sheet bonding has a grease-like predetermined viscosity, it is possible to hold the peeling prevention sheet 1 only by pressing once, and the peeling prevention sheet 1 is not displaced.

  For this reason, the operation | work which hold | maintains a sheet | seat until an adhesive hardens | cures, and fastens with simple anchors, such as a stop pin, required in the conventional peeling prevention construction method becomes unnecessary. Therefore, the work time of overhead work on the tunnel ceiling surface and the lower surface of the bridge, which is a structure that has been a heavy labor, can be reduced.

(5) Completion Then, after the sheet adhesive 6 is cured to some extent so that the anti-peeling sheet 1 is not displaced, the protective film removing step of removing the protective film 5 of the anti-peeling sheet 1 adhered to the surface of the reinforced concrete structure RC I do. Thereafter, if a predetermined curing period is set during which the sheet bonding adhesive 6 is cured, the peeling prevention work by the peeling prevention method according to the present embodiment is completed.

  Thus, in the peeling prevention method according to the present embodiment, the protective film 5 is peeled off from the weather resistant film 3 and removed immediately after completion of the sheet sticking step. For this reason, it can prevent that the peeling prevention sheet 1 gets dirty during the operation | work which affixes the peeling prevention sheet 1 to a structure, such as an adhesive agent adhering to the weather-resistant film 3 etc. accidentally.

  On the other hand, in the conventional peeling prevention method, in addition to the primer coating process, the adhesive coating process, and the sheet sticking process, an impregnation adhesive coating process for coating the impregnated adhesive on the adhered stripping prevention sheet, and an adhesive after curing A weather-resistant paint application process for applying a weather-resistant paint that prevents UV degradation such as the above has been required.

  On the other hand, according to the peeling prevention method according to the present embodiment, the peeling prevention sheet 1 can be obtained without performing the impregnation adhesive coating step and holding the peeling prevention sheet 1 on the sheet bonding adhesive 6 for a certain period of time. The sheet adhesive 6 is cured without shifting. Therefore, it is possible to greatly improve the workability of attaching the peeling prevention sheet 1 to the reinforced concrete structure RC and reduce the construction cost.

  Moreover, according to the peeling prevention construction method concerning this embodiment, a weather-resistant coating-material application | coating process is unnecessary and can further reduce work days. In addition, unlike the field work in which the quality is affected by the weather, the weather-resistant film 3 having a stable quality by factory production can prevent deterioration factors such as salt damage and neutralization as well as ultraviolet rays.

[Peeling prevention re-repair method]
Next, the peeling prevention re-repair method according to the embodiment of the present invention will be described with reference to FIG. FIG. 5 is a flowchart showing each process of the peeling prevention re-repair method according to the embodiment of the present invention. In addition, the case where the reinforced concrete structure RC which adhered the peeling prevention sheet 1 by the peeling prevention construction method which concerns on the above-mentioned embodiment is repaired again is illustrated and demonstrated.

  Here, the re-repair is assumed to occur when the reinforced concrete structure RC covered with the peeling prevention sheet 1 is peeled off and the stripped concrete pieces in the peeling prevention sheet 1 are removed. In addition, re-repairing refers to repairing deformed parts that have failed such as reinforcing steel plates and reinforcing CFRP (carbon fiber reinforced plastic plates) for seismic reinforcement.

(1) Deformation part removal process First, as shown in FIG. 5, in the anti-peeling repair method according to the embodiment of the present invention, the anti-degradation sheet 1 of the deformed part in which a defect such as a part where the exfoliation occurred occurs. A deformed portion removing step of cutting and removing the deformed portion is performed.
Further, the deformed portion after the removal is filled with putty, mortar or the like so that the surface of the reinforced concrete structure RC becomes smooth.

  At this time, the weather-resistant film 3 of the existing anti-peeling sheet 1 adhered around the deformed portion is the above-mentioned Tedlar (registered trademark) PVF film with improved adhesion to the adhesive. For this reason, the range which peels off the existing peeling prevention sheet 1 around a deformation | transformation part can be made into the minimum as an adhesion allowance of the new peeling prevention sheet 1 which adhere | attaches later. Therefore, the work time of this process can be shortened, and the number of the new anti-separation sheets 1 can be reduced.

(2) Primer application process Next, as shown in FIG. 5, in the peeling prevention re-repair method according to the present embodiment, on the surface of the reinforced concrete structure RC smoothed in the previous step, similar to the above-described peeling prevention method. A primer application process for applying a primer for improving adhesion is performed.

(3) Adhesive application process Next, as shown in FIG. 5, in the peeling prevention re-repair method according to the present embodiment, the reinforced concrete structure RC to which the primer was applied in the previous step is applied in the same manner as the above-described peeling prevention method. An adhesive application process is performed on the surface to apply the above-described sheet adhesive 6.

(4) Sheet Affixing Step Next, as shown in FIG. 5, in the peeling prevention re-repair method according to the present embodiment, the inner surface of the reinforced concrete structure RC to which the sheet bonding adhesive 6 is applied in the previous step is provided. The sheet sticking process which sticks the above-mentioned peeling prevention sheet 1 which peeled off the protective film 5 is performed.

  At this time, in this process, without performing the roughening process which damages the weather resistant film 3 which was necessary in the conventional peeling prevention re-repair method, it is for sheet adhesion on the weather resistant film 3 of the existing peeling prevention sheet 1. It is only necessary to apply the adhesive 6 and attach the new anti-strip sheet 1 as it is. For this reason, the workability at the time of re-repair can be improved, and the construction cost at the time of re-repair can be reduced.

(5) Completion And the protective film removal process which removes the remaining protective film 5 of the adhesion | attachment peeling prevention sheet 1 is performed. Thereafter, if a predetermined curing period is set during which the sheet bonding adhesive 6 is cured, the re-repair work by the peeling prevention re-repair method according to the present embodiment is completed.

  According to the peeling prevention re-repair method according to the present embodiment described above, the new peeling prevention sheet 1 can be bonded onto the existing peeling prevention sheet 1 without performing a roughening process. For this reason, a repair range can be made into the minimum range around a deformed part, and the workability | operativity at the time of a repair is improved. Therefore, the construction cost at the time of re-repair can be reduced.

  Further, when steel plate adhesion reinforcement or CFRP adhesion reinforcement is performed for seismic reinforcement or the like, the steel sheet reinforcement or CFRP reinforcement can be performed by directly applying an adhesive to the weather-resistant film 3 of the existing anti-peeling sheet 1. For this reason, it is not necessary to peel off and remove the existing peeling prevention sheet 1, and the peeling prevention work already performed is not wasted.

[Effectiveness confirmation test]
Next, with reference to FIG. 6 and Table 1, a description will be given of an overlay condition adhesion test performed to confirm the adhesion strength when the above-described peeling prevention sheet 1 is overlaid and constructed. FIG. 6 is a photograph showing the state of specimen destruction after the overlay condition adhesion test.

  The test method for this adhesion test is to first clean the surface of a concrete plate for paving compliant with JIS A 5304 with a disk sander or the like. Thereafter, using a plurality of resins such as the above-mentioned adhesive agent 6 for sheet adhesion, a part of the first sheet and the second sheet of the above-described peeling prevention sheet 1 are overlapped and bonded, and a specimen having an overlapping portion is obtained. create. After the specimen was cured at 20 ° C. for 7 days, a 40 mm × 40 mm steel adhesive was adhered to the specimen with an epoxy resin adhesive, and the adhesion strength was measured by a uniaxial vertical tensile test. It was. The test results are shown in Table 1.

  As shown in Table 1 and FIG. 6, it can be seen that even if any adhesive is used, the pavement concrete flat plate as a base material is broken. Therefore, even if it does not perform a roughening process, the adhesive 6 for sheet | seat adhesion is apply | coated on the weatherproof film 3 of the existing peeling prevention sheet 1, and it peels firmly only by sticking the new peeling prevention sheet 1 as it is. It can be said that the prevention sheets 1 can be bonded to each other.

  As described above, the peeling prevention sheet, the peeling prevention construction method, and the peeling prevention re-repair work according to the embodiment of the present invention have been described in detail. However, any of the above-described or illustrated embodiments has been embodied in carrying out the present invention. The embodiments are merely examples, and the technical scope of the present invention should not be construed as being limited thereto.

1: Stripping prevention sheet 2: Fiber substrate 3: Weather resistant film 4: Laminate adhesive 5: Protective film RC: Reinforced concrete structure (structure)

The exfoliation preventing sheet according to the first aspect of the present invention is an exfoliation preventing sheet that is adhered to the surface of a structure having a water-absorbing inorganic material and prevents exfoliation of the exfoliation from the surface. A fiber base material having a predetermined strength, and a weather resistant film which is bonded with a laminate adhesive impregnated in the fiber base material and shields ultraviolet rays to improve the weather resistance. wood is canvas der the warp and weft yarn of a predetermined thickness of natural fibers or synthetic fibers made of a plurality of twisted and twisted is plain weave is, the canvas is 130.8 tex 30 tex (tex) or higher (tex) less than a basis weight by adjusting the vertical weft thread count made yarn is characterized in that it is a 100 g / m ² or more 412 g / m ² or less.

The anti-peeling sheet according to the second invention is characterized in that, in the first invention, the weather resistant film is made of a polyvinyl fluoride resin.

The peeling prevention method according to the third aspect of the invention is a peeling prevention method in which the peeling prevention sheet according to claim 1 or 2 is adhered to the surface of a structure having a water-absorbing inorganic material to prevent the peeling off the surface. An adhesive application step of applying a time-curing adhesive for sheet adhesion to the surface of the structure, and a sheet sticking step of attaching the anti-separation sheet on the adhesive for sheet adhesion. And the sheet adhesive is cured without shifting the anti-slipping sheet even if the anti-slipping sheet is not retained on the adhesive for sheet adhesion for a certain time after the sheet sticking step is completed. To do.

In the third invention, the peeling prevention method according to the fourth invention is a method in which a protective film made of a resin film is stuck on the weather resistant film of the peeling prevention sheet before the sheet sticking step, and after the sheet sticking step is finished. The protective film is removed by removing the protective film from the weather-resistant film.

The refurbishment prevention repair method according to the fifth aspect of the present invention is a method for re-repairing a structure having a surface to which the exfoliation prevention sheet according to claim 2 is adhered, and further attaching the exfoliation prevention sheet to the surface after the repair. It is a peeling prevention re-repair method that prevents the peeled material from peeling off, without applying a roughening step that damages the weather resistant film, and applying an adhesive for sheet adhesion on the weather resistant film, Further another anti-peeling sheet is stuck on the anti-peeling sheet.

According to 1st invention- 4th invention, it is a two-layer structure of a fiber base material and a weather-resistant film, and the warp yarn and the weft which a fiber base material consists of the twisted yarn by which several original yarns of predetermined thickness were twisted together Since it consists of a plain woven canvas, the thickness of the whole sheet can be reduced and workability and repairability can be improved.

In addition, according to the first to fourth inventions, since the fiber base material is a plain woven canvas instead of a mesh-like one, the fall of small pieces such as a concrete piece of 10 mm or less which causes human damage by dropping is prevented. And there is no fear of anxiety to a third party passing under the structure.

In addition, according to the first to fourth inventions, the fiber base material is composed of a twisted yarn in which a plurality of thin raw yarns are twisted together. Impregnation between the base material and the laminate adhesive is improved, and a two-layer structure of a fiber base material and a weather resistant film becomes possible. For this reason, the workability which affixes a peeling prevention sheet to a structure improves, and construction cost can be reduced.

In particular, according to the first invention, the number basis weight by canvas fiber substrate to adjust the vertical weft implantation present consists 30 tex (tex) or 130.8 tex (tex) or less of the original yarn 100 g / since a m ² or more 412 g / m ² or less, while exhibiting various functions required at the beginning peeling prevention sheet a predetermined strength to suppress the fall of flaking was an overall anti-stripping sheet can be thinner. For this reason, the workability which affixes a peeling prevention sheet to a structure can further be improved, and construction cost can be reduced.

In particular, according to the second and fifth inventions, the weather resistant film is made of a polyvinyl fluoride resin, so that it exhibits an excellent ultraviolet blocking effect and antifouling property, and has good adhesion to the adhesive for sheet adhesion. It becomes. For this reason, it is possible not only to perform a roughening process, but also to attach another anti-peeling sheet on the anti-peeling sheet, and to improve the workability at the time of repair. For this reason, the construction cost at the time of re-repair can be reduced.

In particular, according to the third aspect of the invention, since the adhesive agent for sheet curing is cured without displacing the anti-peeling sheet without holding the anti-peeling sheet on the adhesive for sheet bonding for a certain period of time, It is possible to reduce the construction cost by improving the workability to be attached to the sheet.

In particular, according to the fourth invention, after the sheet sticking step is completed, the protective film is peeled off from the weather resistant film and removed, so that the adhesive is accidentally attached to the weather resistant film, etc. It is possible to prevent the peeling prevention sheet from becoming dirty during the pasting operation.

Claims (6)

A peeling prevention sheet that adheres to the surface of a structure having a water-absorbing inorganic material and prevents peeling off the surface,
A two-layer structure comprising: a fiber base material having a predetermined strength that suppresses falling of the exfoliated material; and a weather-resistant film that is bonded with a laminate adhesive impregnated in the fiber base material to block ultraviolet rays and improve weather resistance Consists of
The stripping prevention sheet, wherein the fiber base material is a canvas in which warps and wefts composed of a plurality of twisted yarns of natural fibers or synthetic fibers having a predetermined thickness are woven. The basis weight is 412 g / m ² or less by adjusting the number of driven warps, wherein the canvas is made of a raw yarn of 130.8 tex or less. Anti-peeling sheet. The anti-peeling sheet according to claim 1 or 2, wherein the weather resistant film is made of a polyvinyl fluoride resin. A peeling prevention method for preventing the fallen material from peeling off from the surface by adhering the fallout prevention sheet according to any one of claims 1 to 3 to the surface of a structure having a water-absorbing inorganic material,
An adhesive application step of applying a time-curable adhesive for sheet adhesion to the surface of the structure;
A sheet pasting step of pasting the anti-slipping sheet on the adhesive for sheet adhesion,
After completion of the sheet sticking step, the peeling adhesive sheet is cured without shifting the peeling prevention sheet without holding the peeling prevention sheet on the adhesive for sheet adhesion for a certain period of time. Prevention method. Before the sheet sticking step, a protective film made of a resin film is stuck on the weather resistant film of the peeling prevention sheet, and after the sheet sticking step, the protective film is peeled off from the weather resistant film and removed. The film removal process is performed. The method according to claim 4, wherein the film removal process is performed. 4. When repairing a structure having a surface to which the anti-separation sheet according to claim 3 is adhered, the anti-detachment prevents the exfoliation from peeling off from the surface by further bonding the anti-separation sheet after the repair. Re-repair method,
Applying a sheet-adhesive adhesive on the weather-resistant film without applying a roughening step that damages the weather-resistant film, and further sticking the other anti-drop-off sheet on the anti-drop-off sheet. A unique anti-peeling repair method.