JP2004251102A - Repair method and repair structure of existing roof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve a waterproof property and a strength of an existing roof using the roof as it is without producing a construction demolition material while a building may be used during a period of repairing of its roof, by laying a thin cloth on a surface of the existing roof and coating a waterproofing upper layer resin thereon to impregnate the cloth with the resin. <P>SOLUTION: Process A: The surface of the roof R is cleaned (Omittable). Process B: The surface of the cleaned roof R is coated with an lower layer resin 1 (Fig. 1) (Omittable). Process C: A thin fibrous sheet 5 is laid on the surface of the roof coated with the lower layer resin 1. Process D: A thin fibrous cloth 2 is laid on the fibrous sheet 5 (Fig. 2). Process E: The cloth 2 which is laid is further coated with the waterproofing upper layer resin 3 which is a liquid impregnable into the cloth 2 (Fig. 3). Process F: A surface of the cloth impregnated with the upper layer resin 3 is coated with a weather-resistant surface layer resin 4 (Fig. 4). <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

  The present invention relates to a repair method and a repair structure for an existing roof, and more particularly to a repair method and a repair structure for a roof that has already been built and has been deteriorated after a lapse of years.

Demolishing a building and building a new one generates a huge amount of construction waste. In recent years, there has been a strong demand for environmental measures not to emit such building waste. Even if only the roof is newly rebuilt, a huge amount of construction waste will still be generated. In addition, during the new construction, the building could not be used as a matter of course, which was inconvenient.
JP 2002-206315 A JP-A-2002-293978

  An object of the present invention is to make it possible to use such a building during renovation without such building waste.

  In order to achieve the above object, the present invention lays a thin fiber cloth on the surface of an existing roof, and further applies a waterproof upper layer resin impregnable to the cloth on the laid cloth. At the same time, the cloth was impregnated with the upper layer resin, and the resin was dried by the impregnation of the upper layer resin, whereby the cloth was hardened and the strength was improved. As a result, the existing roof can be used as it is, and the waterproofness and strength of the roof can be improved, and there is no waste of building materials and the existing roof will not be removed. Can be.

  In order to reduce the amount of the upper layer resin 3 or the lower layer resin 1 as much as possible, a cloth 2 having a lower impregnation amount of the upper layer resin 3 or the lower layer resin 1 was used. The cloth 2 has closed cells 14 inside, and the impregnation amount of the upper resin 3 or the lower resin 1 is reduced. The cloth 2 does not have a cushioning property like urethane foam. Since the bubbles in the urethane foam are not independent, the upper layer resin 3 or the lower layer resin 1 easily penetrates.

(1) Roof repair method The roof to be repaired is made of slate, asbestos (asbestos), asbestos slate, metal, pottery, plastic, etc., and the shape is planed, tiled, thatched, corrugated, flat, and stepped. There are various types of roofs, such as roofs with no steps, styles such as tiles, folded plates, and rod roofs. The invention is best suited for retrofitting slate roofs.
The method of renovating the roof consists of the following steps.
(Step A) The surface of the roof R supported by the steel frame T or the like is cleaned.
(Step B) On the surface of the cleaned roof R, a waterproof liquid-state lower resin 1 that can impregnate the cloth 2 and the fiber sheet 5 is applied (FIG. 1).
(Step C) A thin fiber sheet 5 is laid on the surface of the roof R to which the lower resin 1 has been applied.
(Step D) The fiber cloth 2 is laid on the thin fiber sheet 5 (FIG. 2).
(Step E) On this laid cloth 2, a waterproof liquid upper layer resin 3 that can be impregnated with the cloth is further applied (FIG. 3).
(Step F) A weather-resistant surface layer resin 4 is applied to the surface of the cloth impregnated with the upper layer resin 3 (FIG. 4).
In addition, the cleaning of the surface of the roof R in the above (step A) can be omitted.

  What supports the roof R in the process A may be reinforced concrete, a building block, or the like, in addition to the steel frame T, and the structure may be a paired or fire-resistant structure or a quasi-fire-resistant structure. The roof R can be cleaned by broom sweeping, washing with water, washing with a detergent, jet water, washing with a washing machine, scourer or electric brush, or by hitting dry ice particles on the surface of the roof R to clean the roof surface. , Or a combination of these methods.

  This cleaning includes a drying step, and the drying may be any of natural drying, sunlight, a heater, a fan, a blower, or a combination thereof. In the case of cleaning without using water, this drying step is unnecessary. In the case where water is not used with the scourer or the electric brush, the drying step is not necessary in the case of broom sweeping and dry ice blasting.

  The above cleaning can be omitted. In this case, the dust on the surface of the roof R and the peeled material of the material of the roof R are not removed, but are enclosed by the lower resin 1 or the upper resin 3. Thereby, scattering of dust on the surface of the roof R and delamination of the material of the roof R can be prevented. When the material of the roof R is made of a harmful material such as asbestos, asbestos slate, heavy metal, vinyl chloride resin or the like, it is possible to prevent such exfoliated matter from scattering and adversely affect human health and the environment. Nothing.

  The containment / enclosure / prevention of scattering / prevention of damage / reinforcement / protection of such harmful substances such as asbestos is performed on the roof of the building / facility, the rooftop surface of the building / facility, and the ceiling / floor of the building / facility. Upper surface / lower surface / slope surface, vertical surface / slope wall surface of building / facility, horizontal / vertical / slope buried underground / ground pipe / pipe / electric pole / iron pole / column / tower / gate / bridge / road It is also applicable to the outer surface / inner surface of a structure such as a / tunnel.

  According to the experiments, when such cleaning is not performed, the strength of the existing roof renovated by the above process is not reduced or only reduced by several percent compared to the case where cleaning is performed, and there is no problem in strength. Was. Without such cleaning, harmful asbestos can be contained by the above steps, and the present invention can be regarded as a method for containing asbestos and a containment structure contained by the method for containing asbestos.

  The cloth 2 in the step C is laid before the lower resin 1 of the step B is dried, and the lower resin 1 is impregnated in the cloth 2. The lower resin 1 is the same as the upper resin 3, but may be different. The lower resin 1 and the upper resin 3 penetrate and mix with each other. For example, if both have the same property such as aqueous or oily properties, they are mixed.

  The lower resin 1 and the upper resin 3 do not have to permeate with each other and do not need to be mixed, as in the case of a surface resin 4 and an upper resin 3, which will be described later. Further, it is also possible not to apply either one of the lower resin 1 and the upper resin 3. The cloth 2 may be laid after the lower resin 1 has dried. The drying time in this case is several hours, and it is completely dried.

  The application amount of the upper resin 3 or the application amount of the lower resin 1 and the upper resin 3 in the above step D is the same as the thickness of the cloth 2, less than this thickness or a fraction of this thickness, or this thickness. It is applied in an amount exceeding or several times this thickness. The upper layer resin 3 or the lower layer resin 1 and the upper layer resin 3 are applied in such an amount that the cloth 2 penetrates sufficiently or to some extent so as to be sufficiently or partially impregnated. The application volume of the upper resin 3 or the lower resin 1 and the upper resin 3 is equal to or less than the volume of the cloth 2 as described later.

  The upper layer resin 3 of the step D is impregnated until it reaches the surface of the roof R on the lower surface of the cloth 2. When the upper layer resin 3 dries, the cloth 2 is hardened and the strength of the renovated roof is improved. Further, the cloth 2 is adhered to the roof R by the upper layer resin 3, thereby further improving the strength of the renovated roof.

  The surface resin 4 does not mix with the upper resin 3. This is because the material of the surface resin 4 is different from that of the upper resin 3. For example, one is aqueous and the other is oily. In addition, even if the upper layer resin 3 and the surface layer resin 4 have the same property or the same material, such as the same oiliness or the same aqueous property, if the upper layer resin is dried and then the surface layer resin is applied, they are not mixed. The surface resin 4 may not be applied.

(2) Material of Upper Resin 3 and Lower Resin 1 The material of the upper resin 3 and the lower resin 1 is thermosetting or thermoplastic, or non-foamable or foamable, and is waterproof. For example, in addition to unsaturated polyester resin, saturated polyester resin, unsaturated / saturated acrylic resin, alkyd resin, phenol resin, epoxy resin, melamine resin, urea resin, polyurethane, etc., polyethylene, polyvinyl chloride, polystyrene, polypropylene, methacrylic resin , Polycarbonate, polyamide, polyacetal, fluororesin, a mixture thereof, and the like, preferably a nylon resin, an epoxy resin, or a polyester resin, and more preferably an unsaturated polyester resin.

  The upper resin 3 and the lower resin 1 are liquid, sol or gel at room temperature, and those which can sufficiently impregnate the cloth 2 are selected. The impregnation amount of the upper resin 3 (or / and the lower resin 1) to the cloth 2 is 15% to 500%, preferably 25% to 250%, more preferably 35% to 100% (same volume) of the volume of the cloth 2, and Desirably 45% to 75%, and more desirably 50% to 60%, e.g. 55%, the upper resin 3 and / or the lower resin 1 in an amount less than or greater than the volume of the cloth 2 is applied and impregnated. .

  By this impregnation, the upper layer resin 3 incorporating the cloth 2 becomes strong, and the strength of the roof R can be increased. Since the cloth 2 has closed cells 14 to be described later, the impregnation amount of the upper resin 3 (or / and the lower resin 1) can be small. Even when the impregnation amount of the upper resin 3 (or / and the lower resin 1) is smaller than the volume of the cloth 2, the closed resin 14 of the cloth 2 makes the upper resin 3 (or / and the lower resin 1) equal to the volume of the cloth 2. Alternatively, it can be in the same state as impregnated to the same degree or more, and the applied volume of the upper resin 3 (or / and the lower resin 1) can be smaller than the volume of the cloth 2. Of course, the applied volume of the upper resin 3 (or / and the lower resin 1) may be larger than the volume of the cloth 2.

  The coating and impregnating amounts of the upper resin 3 and the lower resin 1 are 0 per 1 mm (millimeter) and 1 m2 (square meter) of the thickness of the cloth 2 at a density (= specific gravity) of 1.00 to 1.20 g / ml. The weight is from 0.3 to 4.0 kg (kg), preferably from 1.0 to 3.0 kg, more preferably from 1.15 to 2.3 kg, and even more preferably from 1.5 to 2.0 kg. By this impregnation, the upper layer resin 3 incorporating the cloth 2 becomes strong, and the strength of the roof R can be increased.

  The upper resin 3 and the lower resin 1 are oily or aqueous, but the oily one has better waterproofness. Even if it is water-based, if the surface resin 4 is oil-based, the renovation roof can achieve waterproofness. A curing agent and a coloring agent may be added to the upper resin 3 and the lower resin 1 in some cases. As specific products, Yupika 4183APT and Yupika 4183PT (products of Nippon Yupika Co., Ltd.) are preferable.

  The density (= specific gravity) of the upper resin 3 and the lower resin 1 is 1.00 to 1.20 g / ml, preferably 1.08 to 1.14 g / ml, and more preferably 1.10 to 1.12. The viscosity is 1.0 to 9.0 dPa · S, preferably 1.5 to 6.0 dPa · S, more preferably 2.0 to 4.5 dPa · S, and the degree of thixotropicity is 1.0 to 4.0 dPa · S. 0, desirably 1.5 to 3.0, the acid value is 10 to 25 mgKOH / g, desirably 12 to 20 mgKOH / g, and the gel time which is the time to set is 5 to 75 minutes, desirably 9 to It is 50 minutes, more preferably 15 to 30 minutes.

  To apply the foamable or non-foamable resin composition liquid of the upper resin 3 or the lower resin 1 to the cloth 2 by impregnating the cloth 2, besides applying with a brush or a roller, spraying with a spray, or a commonly known saturator, coater, or the like Method is applied. By applying the lower layer resin 1, the adhesion / sealing property of the cloth 2 to the surface of the roof R can be improved.

  Since the upper layer resin 3 and the lower layer resin 1 are made of the same component and the same material, the mutual permeability / affinity between the upper layer resin 3 and the lower layer resin 1 is improved, and there is a mismatch between the upper layer resin 3 and the lower layer resin 1. No surface is generated, and the strength of the upper resin 3 and the lower resin 1 can be improved.

(3) Material of Surface Resin 4 The material of the surface resin 4 is thermosetting or thermoplastic, or non-foamable or foamable, and waterproof. For example, in addition to unsaturated polyester resin, saturated polyester resin, unsaturated / saturated acrylic resin, alkyd resin, phenol resin, epoxy resin, melamine resin, urea resin, polyurethane, etc., polyethylene, polyvinyl chloride, polystyrene, polypropylene, methacrylic resin , Polycarbonate, polyamide, polyacetal, fluororesin, a mixture thereof, and the like, preferably a nylon resin, an epoxy resin, or a polyester resin, and more preferably an unsaturated polyester resin. Ortho-, isophthalic-, and bisphenol-based compounds may be used.

  The surface resin 4 is liquid, sol or gel at room temperature, and is oily or aqueous. However, the oily one has better waterproofness, and a resin that does not mix with the upper layer resin 3 is selected. The surface resin 4 has excellent weather resistance, and has good durability against long-term direct sunlight, long-term rainfall / snowfall / acid rain, long-term strong wind, and the like. Since the surface resin 4 has good weather resistance, deterioration such as discoloration / reduced water resistance / deterioration is unlikely to occur, damage such as cracks / scratch / dirt is unlikely to occur, and the cloth 2 impregnated with the upper resin 3 and / or the lower resin 1 is impregnated. For a long period of time to prevent the cloth 2 impregnated with the upper resin 3 and / or the lower resin 1 from being deteriorated or damaged.

  The viscosity of the surface resin 4 when applied using an air gun is 6 to 27 poise, desirably 9 to 18 poise, more desirably 12 to 15 poise, and the thixotropic degree is 3.0 to 9.0, Desirably, it is 4.0 to 7.5, more preferably, 4.5 to 6.0, and the gel time, which is the time to set, is 7.5 to 45 minutes, preferably 10 to 30 minutes, more preferably. 15 to 25 minutes. The surface resin 4 may not be applied in some cases.

  When applied by brushing or roller coating, the viscosity of the surface resin 4 is 12 to 36 poise, desirably 18 to 27 poise, more desirably 21 to 24 poise, and the thixotropic degree is 3.5 to 7.5. Yes, desirably 4.5 to 6.5, more desirably 5.0 to 6.0, and the gel time, which is the time to set, is 7.5 to 45 minutes, desirably 10 to 30 minutes, Preferably, it is 15 to 25 minutes. The surface resin 4 may not be applied in some cases.

  In order to apply and impregnate the foamable or non-foamable resin composition liquid of the surface resin 4 on the surface of the upper resin 3 applied / impregnated on the cloth 2, application by a brush or a roller, spraying by a spray, or the like is performed. . A curing agent and a coloring agent may be added to the surface resin 4 in some cases. Specific examples of the product include Yupika UG-510 series, Yupika 4183 (product of Nippon Yupika Co., Ltd.), and gel coat (product of Koshin Chemical Co., Ltd.).

  The material of the upper layer resin 3, the lower layer resin 1, and / or the surface layer resin 4 is hardly flammable or nonflammable. In particular, when the surface resin 4 is made to have such flame retardancy, the upper resin 3 and the lower resin 1 can be protected from fire, other deterioration or breakage.

  The upper resin 3 and the lower resin 1 may be aqueous, and the surface resin 4 may be oily. Thus, after washing the surface of the roof R with water, the upper resin 3 or the lower resin 1 can be immediately applied without waiting for drying or omitting the drying step. The upper resin 3 and the lower resin 1 may be oily, and the surface resin 4 may be aqueous.

(4) Material of Cloth 2 The cloth 2 is a woven or non-woven cloth or mat and has no cushioning property. The cloth 2 is made of synthetic resin such as polyethylene terephthalate or nylon, basalt fiber, glass fiber, boron fiber, silicon carbide fiber, alumina fiber, carbon fiber, aramid fiber, steel fiber, or the like. Is molded with a synthetic resin of polyethylene terephthalate or nylon. A foamed sponge-like material can be avoided by impregnating the upper resin 3 and the lower resin 1 because of its low strength, but can be used depending on the case. The upper resin 3 sufficiently penetrates into such a cloth 2, and the upper resin 3 incorporating the cloth 2 becomes strong, so that the strength of the roof R can be increased.

  The filament yarn and the entangled portion of the nonwoven fabric formed from the filament yarn are covered with a thermoplastic resin or a thermosetting resin that fills a part of the internal void of the nonwoven fabric, and the remainder of the internal void is the upper resin 3 and / or A resin impregnated permissible void capable of impregnating the lower layer resin 1 was formed, and the thermosetting resin foam or the bubbles contained in the thermoplastic resin foam were wrapped with a thermoplastic resin film or a thermosetting resin film. It is a closed cell, and the resin impregnation allowance occupies 20 to 40% by volume of the entire volume of the cloth 2, and the bulk density is 0.03 to 0.06 g / cm3.

  In FIG. 5, 11 is a filament yarn of a synthetic fiber, 12 is an interlaced portion of the filament yarn 11, and 13 is a thermoplastic resin foam or a thermosetting resin foam covering the filament yarn 1 and the interlaced portion 12 thereof. The foam 13 contains a number of closed cells 14 wrapped with a thermoplastic resin film or a thermosetting resin film. Reference numeral 15 denotes a space formed between the foams 13, and the space 15 is impregnated with a thermosetting resin solution at the time of secondary processing.

  Examples of the filament yarn constituting the nonwoven fabric of the present invention include ordinary synthetic fibers, for example, a filament yarn formed from a thermoplastic synthetic resin such as polyester, polyamide, polyacryl, polyvinyl chloride, and polyolefin, and a polyphenol-based yarn. Filament yarns and inorganic filament yarns formed from metal, carbon, titanium, glass, basalt, etc., are particularly preferred. Filament yarns formed from polyethylene terephthalate and nylon. The monofilament of the filament yarn has a thickness of 0.5 to 15 denier, preferably 1 to 5 denier.

  The nonwoven fabric is called a spunbond woven fabric obtained by randomly arranging and overlapping filament yarns, needle-patching and, if necessary, resin processing. Although the thickness and the basis weight of the nonwoven fabric are not particularly limited, the thickness is preferably 2 to 6 mm and the basis weight is preferably 50 to 170 g / m2 in order to suitably achieve the present invention.

  Examples of the thermosetting resin or thermoplastic resin coated on the filament yarn of the non-woven fabric include polyvinyl acetate / ethylene copolymer, polyvinyl acetate / ethylene / acryl terpolymer, polyacrylate, polyurethane, and methoxylated. Examples thereof include polyamides, polyepoxides, unsaturated polyesters, and mixtures of these resins. In particular, polyvinyl acetate-ethylene copolymers and vinyl polyacetate-ethylene-acryl terpolymers are resins used in secondary processing. It is preferable because the permeability to the impregnating solvent and the flexibility of the obtained cloth 2 are good.

  The copolymerization ratio of the above-mentioned polyvinyl acetate / ethylene copolymer is preferably vinyl acetate / ethylene = 60/40 to 85/15 (molar ratio) and a relatively low molecular weight. It is preferable that the coating has an embedding property of a tensile strength of 10 kg / cm 3, an elongation of 2200%, and a glass transition point of about 15 ° C. below zero.

  The closed cells 14 contained in the thermoplastic resin foam or the thermosetting resin foam are formed by expansion of expandable thermoplastic resin particles described later, and have an average diameter of 45 to 135. Micro is preferable, and when the average diameter is less than 45 micron, the thickness of the cloth 2 is small, the specific gravity is large, and the resin impregnation allowable porosity is reduced, and a lightweight, high-rigidity reinforced plastic cannot be obtained. On the other hand, if the average diameter exceeds 135 μm, the closed cell foaming phenomenon is likely to occur, and the compressive elasticity recovery is undesirably reduced.

  When the above-mentioned closed cells 14 increase and the specific gravity of the cloth 2 becomes less than 0.03, the resin impregnated permissible voids described later become insufficient. On the contrary, when the closed cells decrease and the specific gravity of the cloth 2 exceeds 0.06, The above-mentioned resin impregnation allowable voids become excessively large, and none of them can be used for the purpose of the present invention.

  An inorganic hollow sphere can be mixed in the thermoplastic resin foam or the thermosetting resin foam. Examples of the inorganic hollow spheres include shirasu paroon, glass paloon, and a composite of mullite and glass. Of these, shirasu paroon is particularly preferable because it has good dimensional stability at the time of secondary processing and good threadability of reinforced plastic. The average particle diameter of the inorganic hollow sphere is preferably 60 to 80 μm, and the particle diameter range is preferably 10 to 200 μm.

  The cloth 2 has a gap in which the thermosetting resin solution or the thermosetting resin solution is impregnated at the time of the secondary processing, and this gap is referred to as a resin impregnation allowable gap. The resin-impregnated allowable voids are not closed cells 14 of the thermosetting resin foam, or the closed cells 14 are broken and partially communicated, but are three-dimensionally between the resin foams, and It is a communication structure formed so as to communicate with the nonwoven fabric surface. The percentage of the volume of the resin-impregnated allowable voids relative to the total volume of the cloth 2 is the resin-impregnated allowable void ratio (hereinafter abbreviated as the void ratio), and is measured and calculated by the following method.

  The amount of increase (ncc) of the water surface from the reference line when the sample having a width of 0.7 cm and a length of 40 cm was immersed in a water filled up to the reference line (40 cc) until the sample was immersed in water was read. The amount of decrease (mcc) in the water surface from the reference line when the sample was taken out with the water impregnated in the sample after standing for 10 seconds was read, and the porosity (%) = {m / (m + n)} It is calculated by × 100.

  The porosity of the cloth 2 is 20 to 40%, and if the porosity is less than 20%, the texture of the cloth 2 becomes hard and the impregnation amount of the secondary processing resin becomes too low, so that the rigid foamed polyurethane, the rigid polyvinyl chloride The behavior is similar to that of a non-impregnated type such as a plate, and the flexural elasticity, flexural strength and impact resistance of the reinforced plastic are undesirably reduced. On the other hand, if the porosity exceeds 40%, the compressive elasticity recovery of the cloth 2 decreases, the volume decreases during storage, and the amount of resin impregnated at the time of secondary processing increases, which increases the weight and is uneconomical.

  As the voids of the cloth 2, holes of a predetermined size may be formed at a predetermined area ratio by punching. For example, one hole having a diameter of about 0.5 to 2 mm per 0.25 to 4 cm 2, preferably one hole having a diameter of about 0.75 to 1.5 mm per 0.5 to 2 cm 2, more preferably a diameter of 0.5 to 2 cm 2 Holes of about 1 mm may be formed one by one per square centimeter. Such holes facilitate the penetration of the lower resin 1 and / or the upper resin 3 very easily.

  The method for producing the cloth 2 is as follows. After impregnating the nonwoven fabric with the foamable resin composition liquid containing the thermosetting street fat, the foaming and the crosslinking and curing of the resin are simultaneously performed by drying. The foamable resin composition liquid includes the above-described thermosetting resin foamable thermoplastic resin particles, thermosetting resin foamable thermoplastic resin particles, thermoplastic resin foamable thermosetting resin particles, or thermosetting resin foamable thermosetting. It is an emulsion composed of conductive resin particles, a thickener, and a pH adjuster (for example, aqueous ammonia).

  The expandable thermoplastic resin particles and the like are, for example, a granular substance (for example, manufactured by Matsumoto Yushi Pharmaceutical Co., Ltd., trade name: “Micropearl”) in which a gas such as butane and imptan is contained in an outer material such as a polyvinylidene chloride-allylonitrile copolymer. )) And other commonly used known expandable particulate materials. The blending amount of the expandable thermoplastic resin particles is preferably, for example, 75 to 65 parts by weight based on 25 to 35 parts by weight of the polyvinyl acetate / ethylene copolymer.

  If the blending amount of the expandable thermoplastic resin particles exceeds 75 parts by weight, the resin may fall off, and the suitability for molding operation may deteriorate. If the amount is less than 65 parts by weight, the porosity is undesirably reduced. When the above-mentioned inorganic medium granules are blended in the foamable resin composition liquid, the blending amount is 2 parts per 100 parts by weight of the mixture of the polyvinyl acetate / ethylene copolymer and the foamable thermoplastic resin particles. ~ 15 parts by weight is suitable. Acrylic and other known thickeners are blended in an appropriate amount.

  To apply the foamable or non-foamable resin composition liquid of the upper layer resin 3 or the lower layer resin 1 to the cloth 2 by impregnating the cloth 2, besides applying with a brush or a roller, spraying with a spray, or a commonly known saturator, coater, or the like Method is applied. The impregnation amount of the above composition liquid is suitably 50 to 110 parts by weight with respect to 100 parts by weight of the cloth 2, and if it is less than 50 parts by weight, the desired thickness cannot be maintained, and the predetermined gap %, The texture of the cloth 2 becomes harder, the impregnation amount of the thermosetting resin liquid at the time of the secondary processing decreases, the rigidity decreases, and furthermore, it is not economical. Absent. The upper layer resin 3 sufficiently penetrates into the void or the perforated hole, and the upper layer resin 3 containing the cloth 2 becomes strong, so that the strength of the roof R can be increased.

  The amount of impregnation is adjusted by adjusting the resin concentration, viscosity, dog lance, roll coater rotation ratio, mangle reduction ratio, etc. of the foaming or non-foaming resin composition liquid. In order to heat the cloth 2 having a predetermined impregnation amount, an ordinary large-sized blower, a warm-air blower, a steam dryer, an infrared heater, and other known dryers can be used.

  The cloth 2 having the above structure usually has a thickness of 0.1 to 20 mm, preferably 0.2 to 10 mm, more preferably 0.5 to 5 mm, and still more preferably 1 to 3 mm, and a basis weight of 5 to 900 g / m2, desirably 10 to 450 g / m2, more desirably 25 to 270 g / m2, and still more desirably 50 to 170 g / m2, but is not limited to the above range. The cloth 2 may be perforated by punching or the like.

  The fabric 2 of the present invention is light in weight and has good compression elasticity recovery properties, and can be formed by conventional secondary processing methods such as a hand lay-up method, a spray-up method, an in-die molding molding method, and an in-die washing back mold. Ding method and pultrusion method can be easily applied.

  The cloth 2 may be a woven cloth, and may be woven in a plain weave, a twill weave, a sous weave, or any other weave. However, the material must be easily impregnated with the upper resin 3 and / or the lower resin 1. This is because if not sufficiently impregnated, the cloth 2 impregnated with the upper resin 3 and / or the lower resin 1 does not exhibit sufficient strength. As a specific product of the cloth 2, a T-series of Yupika mat, MC type (a product of Nippon Yupika Co., Ltd.) is preferable.

(5) Shape of Cloth 2 FIG. 6 shows the shape of the cloth 2 having no cushioning property. On the upper surface / surface of the cloth 2, a plurality of lines (lines) 6 are drawn at predetermined intervals in a vertical direction or a horizontal direction. A plurality of holes 7 are formed at predetermined intervals along the line 6 by punching or the like. When the cloth 2 is laid on the roof R, the projections S projecting from the surface / upper surface of the roof R are inserted / penetrated into the holes 7. Thereby, the protrusion S of the roof R does not hinder the repair work of the roof R, and the strength of the repaired roof does not decrease at the protrusion S.

  The line 6 is drawn by an aqueous pen or an oil pen, printed in advance, sewn or woven with a thick thread different in color from the cloth 2, or formed by various methods. The line 6 is a vertical only parallel line, but may be a vertical and horizontal parallel line / square line / cross grid line. The line 6 may have a shape such as a dotted line, a broken line, a point having a large interval, or the like.

  The line 6 is formed in the direction along the slope of the roof R such as asbestos slate or in the direction of the striated wave of the roof R (the above-described vertical direction; the same applies hereinafter). The number is 500, preferably 2 to 200, more preferably 2 to 100, still more preferably 3 to 50, and still more preferably 4 to 10. The interval between the lines 6 is 1000 to 2 mm, preferably 500 to 5 mm, more preferably 500 to 10 mm, more preferably 350 to 20 mm, and even more preferably 350 to 100 mm, for example, 350 to 250 mm.

  The line 6 is also formed in a direction perpendicular to the inclination of the roof R such as asbestos slate or a traveling direction of the waves of the roof R (the above-mentioned lateral direction, the same applies hereinafter). The number and spacing of the horizontal lines 6 are the same as the vertical lines. The distance between the lines 6 is equal to or smaller than the distance between the protrusions S on the roof R, and the number of the lines 6 is larger than the number of lines on the protrusion S. Thereby, it is possible to select the optimum line 6 for the protrusions S at various intervals. This line 6 can be omitted in some cases.

  The protrusions S include bolts and nuts, hook bolt ends, channel bolt ends, pipe bolt ends, lightning bolt ends, U-shaped bolts, J-shaped bolts, nails, iron seats, felt seats, packing, caps, Other projections. The hole 7 may be formed only when the protrusion S projects beyond a predetermined length. When the protrusion S does not protrude beyond a predetermined length, such as a nail, the hole 7 may not be formed. For example, the protrusion amount of the protrusion is 0 to 500%, preferably 0 to 250%, more preferably 0 to 100%, more preferably 0 to 50%, and still more preferably 0 to 50% of the thickness of the cloth 2. If it is 25%, the hole 7 is not formed.

  The hole 7 is formed by press punching or the like. When the cloth 2 is a nonwoven fabric, the holes 7 may be formed from the beginning when the nonwoven fabric is manufactured in advance. The hole 7 may be formed at a site for repair of the roof R in accordance with the interval between the protrusions S. The holes 7 are formed at predetermined intervals along the line 6. When there is a horizontal line 6, a hole 7 is formed at the intersection of the vertical line 6 and the horizontal line 6.

  In the example of FIG. 6, the vertical lines 6 are formed in parallel at 312 mm intervals, the horizontal lines 6 are not formed, the holes 7 are formed at 800 mm intervals along the lines 6, and the holes 7 are They are formed at equal intervals along the horizontal direction. This cloth 2 is 1800 mm long and 1000 mm wide.

  FIG. 7 shows a cross section of the roof R to be renovated. This roof R is a corrugated asbestos slate roof. The protrusions S (such as bolts) of the roof R are attached at intervals of 260 mm in the horizontal direction and at intervals of 800 mm in the vertical direction. Since the roof R is corrugated and the cloth 2 is laid along the corrugation in the horizontal direction, the holes 7 of the cloth 2 are spaced at 312 mm intervals in the horizontal direction, and the projections S are spaced at 260 mm intervals in the horizontal direction. 7 allows all the projections S to be securely inserted. The interval between the holes 7 of the cloth 2 is set to 105 to 135%, desirably 110 to 130%, more desirably 115 to 125%, for example, 120% of the linear interval of the projection S of the corrugated roof R.

  A cut of several centimeters may be formed in the hole 7 outward. With this cut, it is possible to cope with a change in the thickness of the protrusion S. The diameter of the hole 7 is 3 to 100 mm, preferably 5 to 75 mm, more preferably 10 to 50 mm, and further preferably 20 to 30 mm.

  FIG. 8 shows another example of the hole 7. Such a hole 7 may be a temporary hole formed by a plurality of concentric annular perforations, instead of a penetrating through hole. Such annular perforations 7 may be formed in advance with a plurality of types of intervals / sizes / thicknesses in accordance with a plurality of types of intervals and sizes / thicknesses of the projections S. Accordingly, the roof R can be repaired by selecting only the perforated holes 7 corresponding to the protrusions S of the roof to be repaired at the site, and opening and penetrating the holes. The above-mentioned lines 6 and / or holes 7 are also formed in the fiber sheet 5 described below as the case may be.

  The number of concentric circles of the circular perforation may be one or any number. In addition, such a temporary hole 7 may be one in which the thickness of the cloth 2 is reduced along the concentric circle, in addition to the perforation, or provided that the hole 7 can be easily formed in a circular shape, punched out, or penetrated. Any hole 7 is acceptable. The shape of the hole 7 may be any shape such as a square, a polygon, an ellipse, an ellipse, and a star. The cut may be any shape such as linear, "V" shaped, "U" shaped, and the like.

(6) Fiber sheet 5
The fiber sheet 5 is laid under the cloth 2. The material of the fiber sheet 5 is made of synthetic resin, aramid fiber, carbon fiber, basalt fiber or glass fiber, and has no cushioning property. Either a non-woven fabric or a woven fabric may be used, and the weave may be plain weave, twill weave, soot weave, or any other weave. When the fiber sheet 5 is laid under the cloth 2, the strength of the cloth 2 impregnated with the lower resin 1 and / or the upper resin 3 greatly increases.

  When pressure is applied to the resin-impregnated cloth 2 from above, a tensile stress also acts on the resin-impregnated fiber sheet 5, but the resin-impregnated fiber sheet 5 is resistant to tensile stress, so that the strength of the renovated roof is improved. I do. Basalt fiber or glass fiber is suitable as a material resistant to this tensile stress, and plain weave is suitable for weaving.

  The fiber sheet 5 has voids or perforated holes impregnated with the lower resin 1 and / or the upper resin 3, and the voids or holes occupy 20 to 40% of the volume of the cloth. The thickness is 0.25 to 20 mm, preferably 0.5 to 10 mm, more preferably 0.75 to 6 mm, still more preferably 1 to 3 mm, and the basis weight is 10 to 900 g / m2, preferably 20 to 450 g / m2. It is preferably from 30 to 270 g / m2, more preferably from 40 to 170 g / m2. Other structures are the same as the cloth 2 described above.

  The tensile strength of the fiber sheet 5 is 1500 to 1700 N (Newton) for plain weave aramid fiber and carbon fiber, 1400 to 1540 N (Newton) for plain weave basalt fiber, and 730 to 1300 N (Newton) for plain weave glass fiber. The elongation at this time is 2.7 to 3.0% for aramid fiber and carbon fiber, 2.2 to 2.3% for basalt fiber, and 1.3 to 1.8% for glass fiber.

  The fiber sheet 5 is impregnated with the lower resin 1 and / or the upper resin 3, and the lower resin 1 or the upper resin 3 may be applied on the fiber sheet 5 as described above in some cases. . In this case, when the lower resin 1 and the upper resin 3 are different, it is desirable to apply the same resin as the lower resin 1. The fiber sheet 5 may be laid on the cloth 2 in some cases. Even in this case, the lower resin 1 and / or the upper resin can be applied to the surface of the fiber sheet 5.

(7) Test results of the renovated roof of the present invention The strength of the renovated roof was enhanced as follows by the renovating method and the renovating structure of the existing roof of the present invention. In this strength improvement test, using a corrugated slate roofing material, pressure was applied over the existing corrugated slate roofing material in the direction of the traverse crossing the corrugation, and the applied pressure up to breaking was measured. The breaking strength of the existing corrugated slate roofing material before the renovation was 4.6 KN (kilonewton), 469.3 kgf, but by applying the renovation of the present invention, 8.6 KN (kilonewton), 877.5 kgf. (Kilogram force), which is almost twice as high, and even if the fiber sheet 5 is omitted, a considerably high strength improvement of 7.8 KN (kilonewton) and 795.9 kgf (kilogram force) can be achieved.

  In addition, the following test data was obtained for the adhesive strength of the cloth 2 impregnated with the upper layer resin 3 and / or the lower layer resin 1 with respect to a flat surface. For a flat slate roof material, the cloth 2 impregnated with the upper layer resin 3 and / or the lower layer resin 1 is repaired by the method for repairing an existing roof according to the present invention, and when it is peeled off, 15.3 kgf / cm 2 is required. Power was needed.

  This is because the cloth 2 impregnated with the upper resin 3 and / or the lower resin 1 does not peel off from the slate roof surface, but the slate roof remains bonded to the cloth 2 impregnated with the upper resin 3 and / or the lower resin 1. Peeling took place until the material was destroyed. That is, the adhesive strength of the cloth 2 impregnated with the upper layer resin 3 and / or the lower layer resin 1 to the slate roofing material was much larger than the strength of the slate roofing material itself.

  In addition, the cloth 2 impregnated with the upper layer resin 3 and / or the lower layer resin 1 is repaired by the method for repairing an existing roof according to the present invention, and the flat concrete material is removed by 32.0 kgf / cm 2. Power was needed.

  In this case, too, the cloth 2 impregnated with the upper layer resin 3 and / or the lower layer resin 1 is not peeled off from the concrete plane, and the concrete material is adhered to the cloth 2 impregnated with the upper layer resin 3 and / or the lower layer resin 1 while the concrete plane is adhered. Until it was destroyed, the peeling took place. That is, the adhesive strength of the cloth 2 impregnated with the upper resin 3 and / or the lower resin 1 to the concrete plane was much larger than the strength of the concrete material itself.

  From the above, the following remarkable effects can be achieved by the repair method and the repair structure for the existing roof of the present invention. Since the thickness of the cloth 2 is thin and the specific gravity of the upper resin 3 and / or the lower resin 1 to be impregnated is close to water and light, furthermore, not only the resins 1, 3, and 4 but also a light fiber Since the cloth 2 is built in, the weight of the entire renovation structure is 1.0 to 1.6 kg / m 2, and the average is 1.3 kg / m 2, and the load on the roof is small.

  In addition, since the upper resin 3 and / or the lower resin 1 cures quickly, repair work can be performed in a short period of time. As described above, since the strength of the roof is improved and the adhesive strength to the roof is large, the durability is excellent, and the durability of 20 years or more, and in some cases, 25 to 30 years or more is obtained, and the number of times of repairs is reduced.

  Furthermore, since the upper resin 3 and / or the lower resin 1 or the surface resin 4 is less slippery than the surface of the roof itself such as a slate roof, it is less slippery even during construction or inspection, and is highly effective in preventing slipping during work. In addition, the upper resin 3 and / or the lower resin 1 or the surface resin 4 are waterproof and have the above-mentioned strength improvement and high adhesive strength. Also, it is very difficult for rain to leak.

  Further, in the repair method and the repair structure of the existing roof of the present invention, the same resin material as the upper resin 3 and / or the lower resin 1 or the surface resin 4 is formed on the lower surface and the upper surface of the cloth 2. Therefore, even after several years have passed since the renovation of the existing roof according to the method of the present invention for repairing the roof, the same method is used to further repair the roof. The property is good and the renovation roof can be added firmly. In this case, it is only necessary to clean / clean the surface of the renovated roof before adding it.

  The present invention is not limited to the above embodiments, but can be variously modified. For example, the present invention is most suitable for renovating the roof of a large facility such as a factory, a sports facility, or a public facility. However, the roof to be renovated is not limited to the slate roof, and may be any roof.

  The renovation method according to the present invention includes an arcade roof, a building roof surface, a dome-shaped roof, a prefabricated house roof, a wooden house roof, and a reinforced concrete building roof / roof floor surface. In addition to the roofs of buildings / facilities, such as roofs of buildings / facilities, ceiling / floor top / bottom / bottom / slope of buildings / facilities, walls of buildings / facilities vertical / slope, horizontal The present invention can be applied to the outer surface / inner surface of structures such as / vertical / inclined burial underground / ground pipe / pipe / electric pole / iron pole / column / tower / gate / bridge / road / tunnel.

  When applying the lower layer resin 1, the upper layer resin 3 or the surface layer resin 4 to the vertical surface, the lower layer resin 1, the upper layer resin 3 or the surface layer resin 4 may be applied from top to bottom, and when laying the cloth 2, the cloth 2 may be temporarily fixed or pinned to a wall surface. Good. When the lower resin 1, the upper resin 3 or the surface resin 4 is applied to the lower surface of the horizontal plane, the lower resin 1 is sprayed with a spray gun or the like, and when laying the cloth 2, a thin cloth 2 is selected. 2 can be attached to the lower surface.

(8) Other effects of the invention [1] A thin fiber cloth is laid on the existing roof, and a waterproof, liquid upper layer resin that can be impregnated into the cloth is further applied on the laid cloth. And, the cloth is impregnated with the upper layer resin until the cloth reaches the surface of the roof on the lower surface of the cloth, and when the upper layer resin is dried, the cloth is hardened and the strength is improved, and the upper layer resin is impregnated. A method for repairing an existing roof, wherein a cloth is bonded to the roof. Thereby, the waterproofness and strength of the roof can be improved, and no building waste is generated, and the existing roof is not removed, so that the building can be used during roof renovation.

[2] A roof repair structure repaired by the existing roof repair method of claim 1. Thereby, the waterproofness and strength of the roof can be improved, and no building waste is generated, and the existing roof is not removed, so that the building can be used during roof renovation.

[3] The upper layer resin is thermosetting or non-foamable, liquid at room temperature, preferably a nylon resin, an epoxy resin, or a polyester resin, more preferably an unsaturated polyester resin, The impregnation amount for the cloth is 15% to 500%, preferably 25% to 250%, more preferably 35% to 100% (same volume), and still more preferably 45% to 75% of the volume of the cloth. How to renovate existing roofs. By this impregnation of the upper layer resin, the upper layer resin containing the cloth is strengthened and the strength of the roof can be increased. In addition, if the cloth has closed cells, the amount of impregnation of the upper layer resin may be small, and the applied volume of the upper layer resin may be smaller than the volume of the cloth.

[4] The upper layer resin is coated with and impregnated with an upper layer resin in an amount exceeding the volume of the cloth, and the upper layer resin is applied and impregnated at a specific gravity of 1.00 to 1.20 per 1 mm of cloth thickness. And 0.3 to 4.0 kg, preferably 1.0 to 3.0 kg, more preferably 1.15 to 2.3 kg, and still more preferably 1.5 to 2.0 kg per m 2. The method for repairing an existing roof according to claim 1 or 3. Since the upper layer resin exceeding the volume of the cloth is applied and impregnated, the upper layer resin containing the cloth is strengthened and the strength of the roof can be increased.

[5] The cloth is a woven or non-woven cloth, has no cushioning property, and has a void or a perforated hole impregnated with the upper layer resin, and the void or the hole accounts for 20 to 40% of the volume of the cloth. The thickness is 0.1 to 20 mm, preferably 0.2 to 10 mm, more preferably 0.5 to 5 mm, more preferably 1 to 3 mm, and the basis weight is 5 to 900 g / m2, preferably 10 to 10 g / m2. The method for repairing an existing roof according to claim 1, 3 or 4, wherein the weight is 450 g / m2, more preferably 25 to 270 g / m2, and still more preferably 50 to 170 g / m2. The upper layer resin sufficiently penetrates into the void or the perforated hole, and the upper layer resin containing the cloth is strengthened, and the strength of the roof can be increased.

[6] The cloth is made of a synthetic resin such as polyethylene terephthalate or nylon, basalt fiber or glass fiber, and the filament yarn of the nonwoven fabric is formed of a synthetic resin of polyethylene terephthalate or nylon. The method for repairing an existing roof according to claim 1, 3, 4, or 5. As a result, the upper layer resin sufficiently penetrates into the cloth, and the upper layer resin incorporating the cloth becomes strong, and the strength of the roof can be increased.

[7] Before the cloth is laid, a waterproof lower layer resin is applied to the surface of the cleaned roof, and before the lower layer resin dries, the thin fiber is formed on the applied lower layer resin. 7. The method for repairing an existing roof according to claim 1, wherein the cloth is laid. With this lower layer resin, the adhesiveness / sealing property of the cloth to the roof R surface can be improved.

[8] The method for repairing an existing roof according to claim 7, wherein the upper resin and the lower resin are the same. The mutual permeability / affinity between the upper resin and the lower resin is improved, and no inconsistency surface is formed between the upper resin and the lower resin, so that the strength between the upper resin and the lower resin can be improved.

[9] A weather-resistant surface layer resin which is not mixed with the upper layer resin is applied to the surface of the cloth impregnated with the upper layer resin, thereby protecting the cloth impregnated with the upper layer resin and / or the lower layer resin 1 to deteriorate or deteriorate the cloth. The method for repairing an existing roof according to any one of claims 1, 3, 4, 5, 6, 7, and 8, wherein the roof is prevented from being damaged. With this surface layer resin, the lower layer resin, the cloth and the upper layer resin can be protected from deterioration.

[10] A fiber sheet is laid under the cloth, and the fiber sheet is impregnated with the upper layer resin or the lower layer resin. The fiber sheet is made of synthetic resin, aramid fiber, carbon fiber, basalt fiber or The method for repairing an existing roof according to any one of claims 1, 3, 4, 5, 6, 7, 8, and 9, wherein the method is made of glass fiber and has no cushioning property. This greatly increases the strength of the cloth impregnated with the lower resin or the upper resin.

[11] The existing roof according to claim 1, 3, 4, 5, 6, 7, 8, 9, or 10, wherein the surface of the roof is not cleaned or is cleaned before the cloth is laid. Renovation method. Without cleaning, when the roof is made of harmful substances such as asbestos, scattered harmful substances can be prevented and harmful substances can be contained. By cleaning, the adhesion of the lower resin, the cloth or the upper resin to the roof can be improved.

[12] The cloth, wherein holes are formed at predetermined intervals, and the protrusions of the roof are inserted into the holes. The method for repairing an existing roof described in 8, 9, 10 or 11. Accordingly, the repair can be performed while avoiding the protrusion on the roof, and the strength of the repaired roof does not decrease at the location of the protrusion.

[13] The hole of the cloth is formed in accordance with a plurality of sizes or a plurality of intervals of the protrusion, and the cloth is easily penetrated. , 8, 9, 10, 11 or 12 for repairing an existing roof. This allows the cloth to be reliably spread over the roof surface without any gaps, regardless of the size / thickness / interval of the protrusions.

  Spread a thin fiber cloth on the surface of the existing roof, apply a waterproof upper layer resin that can impregnate the cloth on the laid cloth, and impregnate the cloth with the upper layer resin, When the resin is dried by the impregnation of the upper layer resin, the cloth is hardened and the strength is improved. Therefore, using the existing roof as it is, it is possible to improve the waterproofness and strength of the roof, and there is no waste of building materials and the existing roof is not removed, so it is possible to use the building during roof renovation. It produces effects such as being able to.

Indicate how to repair the roof. Indicate how to repair the roof. Indicate how to repair the roof. Indicate how to repair the roof. 2 shows an enlarged cross-sectional structure of the cloth 2. 2 shows a plane of the cloth 2; 2 shows a cross section of a corrugated asbestos slate roof R. The perforation hole 7 of the cloth 2 is shown.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 ... Lower layer resin 2 ... Cloth 3 ... Upper layer resin 4 ... Surface layer resin 5 ... Fiber sheet 6 ... Wire 7 ... Hole 11 ... Filament thread of synthetic fiber 12 ... Entangled part 13 ... Thermoplastic resin foam or thermosetting resin foam 14: closed cells 15: voids

Claims (13)

Lay a thin fiber cloth on the existing roof,
On the laid cloth, a liquid upper layer resin having a waterproof property capable of impregnating the cloth is further applied, and the cloth is impregnated with the upper layer resin until it reaches the surface of the roof on the lower surface of the cloth, When the upper layer resin is dried, the cloth is hardened to improve the strength, and the cloth impregnated with the upper layer resin is bonded to the roof. A roof repair structure repaired by the existing roof repair method according to claim 1. The upper layer resin is thermosetting, or non-foamable, liquid at room temperature, nylon resin, epoxy resin, polyester resin is desirable, unsaturated polyester resin is more desirable, and the upper layer resin is The existing roof according to claim 1, wherein the impregnation amount is 15% to 500%, preferably 25% to 250%, more preferably 35% to 100% (same volume), more preferably 45% to 75% of the volume of the cloth. Renovation method. The upper layer resin is coated with and impregnated with an upper layer resin in an amount exceeding the volume of the cloth, and the upper layer resin is applied and impregnated at a specific gravity of 1.00 to 1.20 per 1 mm and 1 m 2 of the thickness of the cloth. 0.3 to 4.0 kg, preferably 1.0 to 3.0 kg, more preferably 1.15 to 2.3 kg, and still more preferably 1.5 to 2.0 kg. Or repair method of existing roof described in 3. The cloth is a woven or non-woven cloth, has no cushioning property, and has voids or perforated holes impregnated with the upper layer resin, and the voids or holes occupy 20 to 40% of the volume of the cloth. The thickness is 0.1 to 20 mm, preferably 0.2 to 10 mm, more preferably 0.5 to 5 mm, still more preferably 1 to 3 mm, and the basis weight is 5 to 900 g / m2, preferably 10 to 450 g / m2. The method for repairing an existing roof according to claim 1, 3 or 4, wherein the weight is more preferably 25 to 270 g / m2, and still more preferably 50 to 170 g / m2. The fabric is made of synthetic resin such as polyethylene terephthalate or nylon, basalt fiber or glass fiber, and the filament yarn of the nonwoven fabric is formed of polyethylene terephthalate or nylon synthetic resin. Item 1. The method for repairing an existing roof according to Item 1, 3, 4, or 5. Before the cloth is laid, a waterproof lower-layer resin is applied to the surface of the cleaned roof, and before the lower-layer resin dries, the thin fiber cloth is placed on the applied lower-layer resin. The method for repairing an existing roof according to claim 1, wherein the existing roof is laid. The method according to claim 7, wherein the upper resin and the lower resin are the same. The surface of the cloth impregnated with the upper resin is coated with a weather-resistant surface resin that does not mix with the upper resin, thereby protecting the cloth impregnated with the upper resin and / or the lower resin 1 to prevent deterioration or damage. The method for repairing an existing roof according to any one of claims 1, 3, 4, 5, 6, 7 and 8, wherein A fiber sheet is laid under the cloth, and the fiber sheet is impregnated with the upper resin or the lower resin. The material of the fiber sheet is synthetic resin, aramid fiber, carbon fiber, basalt fiber or glass fiber. The method for repairing an existing roof according to claim 1, 3, 4, 5, 6, 7, 8, or 9, wherein the roof has a cushion property. The method for repairing an existing roof according to any one of claims 1, 3, 4, 5, 6, 7, 8, 9, and 10, wherein the surface of the roof is not cleaned or cleaned before laying the cloth. A hole is formed in the cloth at predetermined intervals, and the projection of the roof is inserted into the hole. The method for repairing an existing roof according to Item 10 or 11. The holes of the cloth are formed according to a plurality of sizes or a plurality of intervals of the protrusions, and the cloth is easily penetrated. The method for repairing an existing roof according to 9, 10, 11 or 12.

Images