JP2008297787A - Method of covering fiber sheet on concrete structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of covering a fiber sheet applicable also to the wet surface of a concrete structure having leakages from cracks and joints and capable of shortening construction time by eliminating or simplifying water cut-off construction and a water conducting construction. <P>SOLUTION: This method of covering a fiber sheet for preventing concrete from peeling off comprises a step of so installing a conduction member 8 with a predetermined width formed by pasting an impermeable film 7 on a surface member 5 made of a water absorbing material as to cover the leakage points such as cracks and joints of the structure with the surface member 5 positioned on the structure side, a step of so pasting a fiber sheet 1 on the surface A of the structure as to straddle over the conduction member, and a step of hardening the pasted fiber sheet 1 by emitting light thereto. The water leaking from the concrete structure is made to pass through the inside of the surface member 5 of the conduction member 8, drained from the lower end thereof, and treated. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a peeling prevention method that is one of repair methods for concrete structures such as tunnels, subway premises, viaduct slabs, and side walls, and more specifically, water leaks in a linear or planar shape of a concrete structure. The present invention relates to a fiber sheet coating method particularly suitable for wet surfaces.

  Conventionally, as a concrete structure exfoliation prevention method, a fiber sheet coating is used to repair a concrete structure with cracks, etc. by adhering the fiber sheet to the surface to be repaired to prevent the concrete from coming off the concrete structure. The construction method is known. Further, this fiber sheet is known in which a base material made of reinforcing fibers such as a glass fiber mat is impregnated with a photocurable resin. And from the cracks as described above, water leakage often occurs, and in order to secure the adhesive force, in that case, the surface of the concrete structure to which the fiber sheet is bonded is dried as a rule. It must be in a state. Although depending on the kind of affixing primer as a base for adhering the fiber sheet, it is usually required that the moisture content of the surface of the concrete structure to be repaired is 8% or less.

Therefore, in the conventional fiber sheet coating method, a water conduit (for example, Patent Document 1) is attached to a location where cracks are concentrated, water leakage is introduced and treated, and the fiber sheet is avoided by avoiding the installation portion of the water conduit. Pasting was done. However, such a conventional fiber sheet coating method has various problems as described below.
(1) The water stop work and the water guide work must be completed before affixing the fiber sheet. If there are many water leakage points, the construction period becomes longer.
(2) It is difficult to bond the fiber sheet to the location where the water conduit is attached.
(3) The water leakage location is likely to cause the concrete to be peeled off from the structure, and when the water is peeled off inside the water conduit, it becomes clogged and hinders the water guiding function.
(4) Since there are no transparent wrinkles in commercial products, the internal state of the wrinkles cannot be visually recognized from the outside, and it is uneconomical if it is removed for a deterioration investigation or the like and must be replaced with a new one.
(5) Since the water conduit is exposed on the surface of the concrete structure, the appearance is impaired.

Therefore, the applicant, a photocurable fiber-reinforced resin sheet 5 rich in stretchability, both ends of the to the sheet 5 as the non-adhesive portion 5c of the predetermined length L ₀ on at least one side from the joint portion 2 is formed The sheet 5 bonded to the concrete structure 1, bonded to the concrete structure 1 so as to straddle the joint portion 2, and cured with the joint portion 2. A repair method around the joint portion of the concrete structure that can eliminate the installation of the conventional water conduit as described above has been proposed (see FIG. 2 of Patent Document 2).

However, the repair method described in Patent Document 2 can only be applied to the periphery of the joint portion, and a water leakage point from a non-linear crack in the general portion that is not the joint portion has to be provided with a conventional water conduit. . And, in order to install a water conduit in such a non-straight-cracked water leak location, it is necessary to cut and attach several small pieces according to the bent crack, which takes time and labor. There was also.
JP-A-9-256800 JP-A-2005-273159

  Therefore, the present invention solves the above-mentioned conventional problems, can be applied to a wet surface of a concrete structure where there is a leak point from cracks or joints, etc., and omits water stop work and water guide work or It aims at providing the fiber sheet coating construction method which can simplify and shorten construction time.

  In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that after the surface of the concrete structure is subjected to a ground treatment, the concrete is peeled off by sticking the surface with an adhesive resin so as to cover the fiber sheet. In the fiber sheet covering construction method for preventing the above, a step of installing a non-permeable film so as to cover a leaked portion such as a crack or joint of the concrete structure, and the surface of the concrete structure so as to straddle the film. And a step of affixing a fiber sheet, characterized in that water leakage generated from a water leakage point of the concrete structure is passed between the film and the surface of the structure and drained from below to be treated.

  The invention according to claim 2 is a fiber sheet coating method in which concrete is prevented from peeling off by applying a base treatment to the surface of a concrete structure and then sticking the fiber sheet to the surface with an adhesive resin. A water-conducting member having a predetermined width formed by laminating a non-water-permeable film on a planar material made of a water-absorbing material, such that the concrete material is cracked in such a manner that the planar material is on the structure side. Install so as to cover the water leakage location such as joints, or paste the planar material so as to cover the water leakage location, and then stick the film on it to cover the water leakage location as a water guiding member A step of installing and a step of sticking the fiber sheet on the surface of the concrete structure so as to straddle the water conveyance member; Raw to water leakage is passed through the planar member in the water guide member, characterized in that processed waste water from the downward.

  The invention according to claim 3 is the invention according to claim 1 or 2, wherein the fiber sheet is a prepreg sheet pre-impregnated with an adhesive resin.

  The invention according to claim 4 is the invention according to claim 3, wherein the adhesive resin is a photocurable resin, and has a step of irradiating and curing the attached prepreg sheet. It is characterized by that.

  The invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein the adhesive resin is a translucent resin that transmits light even after curing, and the fibers of the fiber sheet and The film is transparent or translucent.

  The invention according to claim 6 is the invention according to any one of claims 2 to 5, wherein the planar material is a nonwoven fabric.

  The invention according to claim 7 is the invention according to any one of claims 1 to 6, wherein the film or the water guide member is located at a lower part of the water leakage portion on the surface of the concrete structure. It has the process of apply | coating the 1st primer corresponding to a wet to the wet surface in a wet state.

  The invention according to claim 8 is the invention according to any one of claims 1 to 7, wherein the fiber sheet is pasted after the film or the water guide member is installed and before the step of pasting the fiber sheet. It has the process of apply | coating the putty-like 2nd primer with favorable adhesiveness with a concrete surface to the surface of the concrete structure applicable to the part to attach, and the surface of the said film.

  The invention according to claim 9 is characterized in that in the invention according to any one of claims 1 to 8, the film has a step of fastening the film with an anchor along an outer edge of the film.

  The present invention is as described above, and according to the invention described in claim 1, water leakage generated from a concrete structure is caused to flow between the film and the surface of the structure by installing the film. Since it is drained from the bottom and treated, concrete is applied to the wet surface that is leaking in a linear or planar manner from the concrete structure by a fiber coating method without long-term water stoppage work or water transfer work. Repair work for preventing peeling can be performed, and the next process can be started immediately while water leakage treatment is conducted simply by installing the thin film. For this reason, construction time can be shortened significantly and construction cost can also be reduced. In addition, the film does not protrude from the concrete structure like a conventional water conduit. For this reason, the said fiber sheet can be simply affixed and covered on the said film as it is. Therefore, the concrete can be prevented from peeling off over the entire surface of the concrete structure to be repaired, and the aesthetic appearance is not impaired by the repair work.

  According to the second aspect of the present invention, by installing the water guide member, water leakage generated from the water leakage location of the concrete structure is allowed to flow through the planar material of the water guide member and drained from the lower end thereof. Therefore, it is repaired to prevent concrete peeling by the fiber sheet coating method even on wet surfaces that are leaking in a linear or planar shape from a concrete structure without water stoppage work or water transfer work for a long period of time. Construction can be performed, and the next process can be started immediately while water leakage treatment is performed simply by installing the thin water conveyance member. For this reason, construction time can be shortened significantly and construction cost can also be reduced. Further, the water guide member does not protrude from the concrete structure like a conventional water conduit. For this reason, the said fiber sheet can be simply affixed and covered also on the said water conveyance member as it is. Therefore, the concrete can be prevented from peeling off over the entire surface of the concrete structure to be repaired, and the aesthetic appearance is not impaired by the repair work.

  According to the invention described in claim 3, since the fiber sheet is a prepreg sheet pre-impregnated with an adhesive resin, it is possible to omit the adhesive resin application work and its curing waiting time, and therefore, the work time. Can be further shortened. In addition, there is little concern that the resin will sag, and workability is further improved.

  According to invention of Claim 4, since the said adhesive resin is a photocurable resin and has the process of irradiating light and hardening the attached said prepreg sheet, it is a short time by light irradiation. With this, the adhesive resin can be cured, and the working time can be further shortened.

  According to the invention of claim 5, the adhesive resin is a translucent resin that transmits light even after curing, and the fibers and the film of the fiber sheet are transparent or translucent, The state of water leakage or peeling inside the film or the water guide member can be visually recognized from the outside, that is, from the top of the fiber sheet, and it is not necessary to remove or partly peel off the film for deterioration investigation. For this reason, running costs such as survey costs can be reduced.

  According to invention of Claim 6, since the said planar material is a nonwoven fabric, it is suitable for water-absorbing a water leak once, and letting the water flow inside, and can process more water leaks. It can also be obtained and installed at a low cost. For this reason, it is possible to perform the construction by the fiber sheet coating method even at a relatively large amount of water leakage that always leaks in a planar manner, thereby shortening the construction time and reducing the cost.

  According to the seventh aspect of the present invention, the wet surface on the surface of the concrete structure below the water leakage location and wetted after the film or the water guide member is installed is wet-compatible. Since there is a step of applying the first primer, even if there is a wet surface, it is immediately possible to apply the primer without squeezing the surface with a burner and drying it for a long period of time. To the next step. For this reason, construction time can be further shortened and cost reduction can be achieved.

  According to invention of Claim 8, since it has the process of apply | coating the putty-like 2nd primer with favorable adhesiveness with a concrete surface, the surface of a concrete structure and said said Since the adhesion between the fiber sheet and the fiber sheet can be adjusted and the unevenness can be adjusted, the adhesion between the concrete structure and the fiber sheet can be enhanced. For this reason, durability of a repair location improves, the period until the next repair becomes long, and repair cost can be reduced.

  According to invention of Claim 9, since it has the process of stopping the film with an anchor along the outer edge of the film, the film or the water guide member always in a wet state due to water leakage, The adhesive force with the surface of the concrete structure deteriorates with time, and there is no fear that the film, the water guide member, or the liquid drops or slips. For this reason, durability of a repair location improves, the period until the next repair becomes long, and repair cost can be reduced.

  An embodiment of the present invention will be described with reference to the drawings.

  First, the fiber sheet used for the fiber sheet coating method of this Embodiment is demonstrated. FIG. 1 is an explanatory diagram schematically showing a member cross section of the fiber sheet. As shown in FIG. 1, the prepreg sheet 1 which is a fiber sheet is comprised from the main body 2 and the two protective films 3a and 3b arrange | positioned at the both surfaces. The sheet body 2 of the prepreg sheet 1 is a so-called photo-curing resin, that is, a photo-curing radical polymerization resin composition, using a general chopped strand mat whose reinforcing fibers 2a are glass fibers as a base material (not shown). The product is heated and impregnated to obtain a prepreg sheet. And protective film 3a, 3b is a transparent film about 20-60 micrometers thick which consists of a polyester resin which protects that the solvent volatilizes and the sheet body 2 of the prepreg sheet 1 deteriorates. In consideration of the balance of oxygen permeability that acts as a photocuring resin deterioration inhibitor and appropriate humidity barrier properties to maintain flexibility, the protective films 3a and 3b are films made of polyethylene terephthalate. Preferably there is.

  The reinforcing fiber 2a is not limited to glass fiber, but may be any fiber having a predetermined strength. For example, carbon fiber, polyester fiber, phenol fiber, polyvinyl alcohol fiber, aromatic polyamide fiber, nylon fiber, aramid fiber, metal fiber. And so on. And the form of the substrate is not limited to the chopped strand mat, but may be a cloth such as roving, non-woven fabric, woven fabric, or knitted fabric. However, in consideration of light permeability when cured by light irradiation and visibility from the outside after repair, the reinforcing fiber 2a is preferably a transparent fiber. It is preferable that the light transmittance of a shape etc. is 30% or more.

  The photocurable radically polymerizable resin composition is a composition containing a general photocurable resin as a main resin and a liquid polymerizable monomer, a photopolymerization initiator, and the like. The main resin is not particularly limited as long as it generates radicals by ultraviolet rays, visible rays, near infrared rays, and the like, and examples thereof include unsaturated polyester resins, epoxy acrylate resins, urethane acrylate resins, allyl ester resins, and xylene resins. These two or more types may be mixed. The liquid polymerizable monomer is used as a solvent for the main resin component, and examples thereof include acrylic acid esters, methacrylic acid esters, and styrene which is an aromatic vinyl compound. Examples of the photopolymerization initiator include benzophenone, acetophenone, and derivatives thereof.

  In addition, in order not to cause dripping of the resin during storage in the prepreg state (improvement of thixotropy), after the resin is impregnated with the reinforcing fiber, the thickening treatment is performed. As this thickening method, generally, a method of semi-curing the resin by heating or light irradiation, a method of previously mixing a crosslinking agent such as magnesium oxide in the resin, and crosslinking by heating, There is a method in which powder is mixed in advance with a resin and heated and swollen. As long as the thickener is an active ingredient, a thermoplastic resin powder that swells when heated to prepreg the photocurable radical polymerizable resin composition in a prepolymer state into a thickened state with no liquid content. For example, acrylic polymer fine powder and the like can be mentioned. Considering transportability and workability, it is desirable to mix such a thickener into the main resin.

  Next, a fiber sheet coating method for a concrete structure will be described. The present invention can be applied to concrete structures such as tunnels, subway premises, viaduct slabs and side walls, leaking water from cracks, etc., and the leakage state is distributed linearly and flows down or erupts from there. It is particularly suitable for cases where the amount of water leakage is relatively large, or where the amount of water leakage is such that the water leakage state is distributed in a plane and bleeds or drops from there. In the present embodiment, a tunnel is taken as an example of a concrete structure, and a case will be described in which a wet surface in which cracks are generated on the surface of the inner peripheral wall surface and water leaks constantly from there is repaired. 2-10 is explanatory drawing which shows each process according to the flow of the fiber sheet coating method which concerns on embodiment, and all represent the state seen facing the above repair locations.

First, the first process will be described. FIG. 2 is an explanatory view showing the base treatment step (1). In this ground treatment process (1), by checking visually for cracks and joints in the repair range determined in advance by meetings and prior inspection, etc., if there is a place where concrete is likely to fall off, Take necessary measures such as removing the chip with a hammer machine such as a hammer drill. If there are deposits such as dirt, free lime (eflorescence), rust juice, glue (adhesive deposits) on the surface A of the structure to be repaired, these are handy type disc sanders DS (grinders) The surface is smoothed by removing the surface protrusions, depressions, and large steps. If dust, oil stains, etc. are attached, remove them using a dust collector, high pressure washer or organic solvent.
If necessary, inking is performed according to the assignment of the prepreg sheet 1 to be applied in a later step.

  Drawing 3 is an explanatory view showing a nonwoven fabric pasting process (2). In the fiber sheet coating method according to the present embodiment, a nonwoven fabric 5 that is suitable for once absorbing water leakage and allowing water to pass through the inside is used as a planar material made of a material having water absorption. As shown in FIG. 3, in this nonwoven fabric sticking process (2), the nonwoven fabric 5 is adhere | attached so that a water leak location may be covered along a water leak location, such as a crack and a construction joint. The width of the non-woven fabric 5 to be bonded is determined in accordance with the water leakage state of the water leakage location, particularly the amount of water leakage and the shape of the crack, and the desired width and size from the non-woven fabric 5 wound in a roll shape by a cutting means such as scissors or a cutter. Cut into shapes. The material of the nonwoven fabric 5 is more preferably made of a translucent polyvinyl alcohol resin fiber that transmits light to some extent from the viewpoint of durability, visibility from the outside, and the like (the basis weight (fiber content) is relatively small). preferable. However, it is not limited to non-woven fabrics, but it should be a sheet material that is thin and water-absorbing, has a strength that does not break even when exposed to running water, and is capable of turning a certain amount of water (conducting water). That's fine. Further, as the adhesive, the wet-compatible adhesive 6 is used. In this embodiment, the wet-compatible adhesive 6 uses an adhesive having an epoxy resin as a main agent and a polyamidoamine as a curing agent, and the main agent and the curing agent are mixed at a mass ratio of 1: 1. Stir and apply to a caulking gun CG. This wet-compatible adhesive 6 is putty-like (paste-like) having an appropriate flexibility before being cured, so it can be applied with a caulking gun CG, does not sag, and has good workability. Examples of other wet-compatible adhesives include acrylic resins and epoxy acrylate resins.

  FIG. 4 is an explanatory view showing a film sticking step (3). In this film sticking step (3), a wet-compatible adhesive 6 is similarly applied onto the nonwoven fabric 5 stuck in the nonwoven fabric sticking step (2), and the film is cut according to the width and size of the nonwoven fabric 5 Glue. The film may be a film having no water permeability, that is, a material that can prevent leakage of water from leaking outside the film. However, considering visibility from the outside, a transparent film is preferable, and in this embodiment, a transparent polyester resin film (polyethylene terephthalate film) is used. As such a transparent film 7, it goes without saying that various synthetic resin films such as a low-density polyethylene resin film, a high-density polyethylene resin film, a polypropylene resin film, and a vinyl chloride resin film are applicable. Moreover, you may utilize said protective film 3a, 3b.

The non-woven fabric pasting step (2) and the film pasting step (3) are different from the construction place where the repair work is performed, for example, in a place where a stand or the like is not easily affected by wind or the like, and the transparent film 7 and the non-woven fabric 5 is pre-adhered with a wet compatible adhesive 6 to form a water guide member 8, and then the wet compatible adhesive 6 is applied to the nonwoven fabric 5 side of the water guide member 8, and the nonwoven fabric 5 side of the water guide member 8 is applied to the structure surface A. You may make it adhere | attach on the side so that the leak locations, such as a crack, may be covered. If it does so, it will become overhead work and a vertical surface work, and the adhesion | attachment work to the inner peripheral surface of a tunnel which is difficult to work will be only once, and workability | operativity will improve. For this reason, work time can be shortened and construction cost can be reduced. Hereinafter, the member whose back surface is the nonwoven fabric 5 and whose surface is the transparent film 7 is referred to as a water guiding member 8 regardless of the work procedure including those created in the nonwoven fabric pasting step (2) and the film pasting step (3).
Moreover, when there is not much water leakage amount etc., it is also possible to abbreviate | omit a nonwoven fabric sticking process (2).

  FIG. 5 is an explanatory view showing a wet primer application step (4). In this wet primer application step (4), a wet-compatible primer 9 having a quick-drying property, which is the first primer, is used on the wet surface B indicated by the broken line in the drawing of the inner peripheral wall of the tunnel, using a sponge roller SR or a brush. Apply. In the present embodiment, the wetting-compatible primer 9 is prepared by mixing an epoxy resin as a main agent and a modified polyamidoamine as a curing agent, and mixing and stirring the main agent and the curing agent in a ratio of 2: 1 by weight. use. Other examples of the wet-compatible primer include a two-component main component type acrylic resin mainly composed of a modified acrylic ester, a photo-curing type epoxy acrylate resin, and the like. Moreover, since this wet surface is located under the water leak location, such as a crack, water leaks and it has become a wet state. However, the water guide member 8 is formed by the nonwoven fabric application process (2) and the film application process (3). Since the newly leaked water flows down in the nonwoven fabric 5 of the water guide member 8 if the material is bonded, the wet surface B dries if it can be left for a long time to dry. (4) can be omitted. It is also possible to dry with a burner or the like. However, when the wet-compatible primer 9 with quick drying is applied, the process can proceed to the next process reliably and quickly, and the working time can be shortened in that respect.

FIG. 6 is an explanatory view showing a sticking primer application step (5). In this sticking primer application step (5), the sticking primer 10 is applied with a trowel K, a roller or the like over the entire repair target range of the structure surface A. The sticking primer 10 may be putty-like with good adhesion to the concrete surface, but in the present embodiment, a room temperature curing primer mainly composed of an epoxy acrylate resin is used, and the coating amount is Apply 1.0 to 1.3 (kg / m ² ) as a guide. Other examples of the sticking primer include an acrylic resin and an epoxy resin, and a photocurable resin can also be used. At this time, it is applied also on the water guide member 8 applied in the nonwoven fabric application step (2) and the film application step (3) so that the entire surface to be repaired is smooth. In particular, it is applied so as to eliminate the step between the water guide member 8 and the structure surface A. Thus, if the sticking primer 10 is putty-like, the surface to be repaired can be easily smoothed. Therefore, the prepreg sheet 1 and the structure surface A to be stuck in the next step as a surface reinforcing material for preventing peeling. The integrity (adhesive force) can be increased.

  FIG. 7 is an explanatory view showing a prepreg sheet attaching step (6). In this prepreg sheet affixing step (6), first, the protective film 3b on the affixing side of the prepreg sheet 1 is peeled off and affixed so that the sheet body 2 is on the structure side before the affixing primer 10 in the previous step is cured. (See also FIG. 1 below). At this time, the prepreg sheet 1 is pressed from the center to the end with a rubber roller GR or the like, and uniformly adhered while defoaming so as not to cause wrinkles at the lifted portion, burrs at the end, and entrapment of bubbles. And paste. During this time, since the protective film 3a remains on the surface of the sheet main body 2, the defoaming operation can be easily performed with the rubber roller GR and the liquid polymerizable monomer such as styrene having a strong odor is volatilized. Thus, it is possible to prevent the work efficiency of the worker from being lowered.

FIG. 8 is an explanatory view showing the ultraviolet irradiation step (7). In this ultraviolet irradiation step (7), an ultraviolet irradiator BL is installed, irradiated with ultraviolet rays at an illuminance of about 2000 μW / cm ² or more for about 20 minutes, and the prepreg sheet 1 is cured to be integrated with glass fibers as reinforcing fibers. As a result, an FRP layer is formed on the structure surface A. Of course, it is only necessary to irradiate light according to the characteristics of the photocurable resin impregnated in the prepreg sheet 1, and it is not limited to ultraviolet irradiation. Then, after turning the end of the protective film 3a and confirming that the sheet main body 2 has been cured by touch or the like, the protective film 3a is slowly peeled off from the end. At this time, care should be taken so that the film is not broken and left unattached.

  Moreover, since it takes about 6 hours for a sticking primer to harden | cure completely, you may temporarily fix the prepreg sheet | seat 1 with an anchor pin etc. as needed. Since the prepreg sheet 1 is impregnated with the photocurable resin as described above, a photocurable resin having good adhesion to concrete is selected and temporarily fixed with an anchor pin or the like. And if it can be stopped by a certain method from the time of irradiating light until the prepreg sheet 1 is cured, it is also possible to omit the sticking primer application step (5).

FIG. 9 is an explanatory view showing the anchor fixing step (8), and FIG. 11 is an explanatory view of the use of the plastic anchor showing the plastic anchor as a side surface and showing the structure side as a cross section. In this anchor fixing step (8), after the prepreg sheet 1 and the affixing primer 10 are cured, a predetermined diameter (about 8 mm in diameter) is formed on the structure with a drill or the like from above the prepreg sheet 1 along the outer edge of the water guide member 8. A hole having a predetermined depth (about 60 mm) is formed, and the plastic anchor 11 is struck into the hole with a rubber hammer or the like to insert the water guide member 8 from above the prepreg sheet 1. As shown in FIG. 11, the plastic anchor 11 is made of polypropylene resin, and has a large head portion with an anchor body 11 a having a length of about 50 mm and a pressing portion 11 b corresponding to the head portion of the nail having an outer diameter of about 60 mm. A plurality of ridges 11c are formed on the outer peripheral surface of the distal end portion of the anchor main body 11a, and the ridges 11c are formed on the inner peripheral surface of the hole by being inserted into a hole having a diameter smaller than the outer diameter of the ridge 11c. The plastic anchor 11 is prevented from being pulled out. When the water guide member 8 is stopped from above the prepreg sheet 1 with the plastic anchor 11 in this manner, the prepreg sheet 1 and the structure surface A are not bonded to each other from the non-bonded portion C on the water guide member 8 of the prepreg sheet 1. In particular, the prepreg sheet 1 is peeled off, and the possibility that the integrity with the structure is impaired is reduced.
Such anchors for fixing are not limited to plastic anchors, and composite anchors, anchor pins, curl plugs, hole-in anchors, as long as the water guide member 8 and the prepreg sheet 1 can be mechanically fastened. Various anchors such as chemical anchors can be employed.

  FIG. 10 is an explanatory diagram showing the flow end treatment step (9). In this flow end treatment process (9), the lower end of the water guide member 8 and protruding from the prepreg sheet 1 (removal part D) is cut and removed by a cutting means such as a cutter. By doing so, it can prevent that the prepreg sheet 1 peels from this part. The location where the flow end treatment is performed is not necessarily the lower end of the water guide member 8, and may be an arbitrary position above the lower end as long as it is below the water guide member 8.

  According to the fiber sheet covering method for a concrete structure according to the present embodiment as described above, it is assumed that water is continuously leaked from the concrete structure in a linear / planar shape by simply installing a thin water guide member. Even wet surfaces can be repaired to prevent concrete peeling by the fiber sheet coating method. Therefore, the repair work can be greatly shortened. Moreover, it does not protrude from the surface of the structure like a conventional water conduit, and can be installed even in places where there is no installation space, and the problem that a fiber sheet (prepreg sheet) cannot be installed in the water conduit portion is solved. It can be done, and the beauty is not lost.

  In the embodiment, the shape, structure, etc. of the members shown in the drawings and the like show a preferable example to the last, and the design can be changed arbitrarily within the scope described in the claims. It can be corrected. In particular, the fiber sheet is not limited to a prepreg sheet, and the fiber sheet coating method is suitable for application by applying an adhesive resin such as a thermosetting resin or a photocurable resin to the surface of a concrete structure with a brush or the like. It may be a conventional coating method such as a so-called hand lay-up method in which a fiber sheet is pasted after a curing time, and an FRP layer is formed on the surface of the structure by applying and curing an adhesive resin again. Absent.

It is composition explanatory drawing showing typically the member section of the fiber sheet concerning an embodiment of this invention. It is explanatory drawing which shows the base treatment process of the fiber sheet coating method which concerns on one embodiment of this invention. It is explanatory drawing which shows a nonwoven fabric sticking process same as the above. It is explanatory drawing which shows a film sticking process same as the above. It is explanatory drawing which shows the wet primer application process same as the above. It is explanatory drawing which shows the sticking primer application process same as the above. It is explanatory drawing which shows a prepreg sheet sticking process same as the above. It is explanatory drawing which shows an ultraviolet irradiation process same as the above. It is explanatory drawing which shows an anchor fixing process same as the above. It is explanatory drawing which shows a flow-end process process same as the above. It is anchor usage explanatory drawing which shows the anchor which concerns on embodiment of this invention by a side surface, and shows the structure part side by a cross section.

Explanation of symbols

1 Prepreg sheet (fiber sheet)
5 Nonwoven fabric (planar material)
7 Transparent film 8 Water guide member 9 Wet-compatible primer (first primer)
10 Adhesive primer (second primer)
A Structure surface B Wetting surface C Non-adhesive part D Cut part

Claims (9)

In the fiber sheet coating method that prevents the concrete from peeling off by applying a base treatment to the surface of the concrete structure, and then sticking the fiber sheet on the surface with an adhesive resin.
There are a step of installing a non-permeable film so as to cover water leakage points such as cracks and joints in the concrete structure, and a step of sticking the fiber sheet on the surface of the concrete structure so as to straddle the film. A fiber sheet coating method for a concrete structure, characterized in that water leakage generated from a water leakage point of the concrete structure is passed between the film and the surface of the structure and drained from below to be treated. In the fiber sheet coating method that prevents the concrete from peeling off by applying a base treatment to the surface of the concrete structure, and then sticking the fiber sheet on the surface with an adhesive resin.
A water-conducting member having a predetermined width formed by bonding a non-water-permeable film to a planar material made of a material having water absorption properties, such as cracks and joints in a concrete structure so that the planar material is on the structure side. It is installed so as to cover the leaking point such as, or after the sheet material is pasted so as to cover the leaking point, the film is pasted thereon to cover the leaking point as a water guiding member And a step of affixing the fiber sheet to the surface of the concrete structure so as to straddle the surface of the water conveyance member, and leaking water generated from a water leakage location of the concrete structure in the planar material of the water conveyance member A fiber sheet coating method for a concrete structure, characterized by allowing water to flow through and draining from below.   The fiber sheet coating method for a concrete structure according to claim 1 or 2, wherein the fiber sheet is a prepreg sheet pre-impregnated with an adhesive resin.   4. The fiber sheet coating of a concrete structure according to claim 3, wherein the adhesive resin is a photocurable resin and has a step of irradiating and curing the attached prepreg sheet. Construction method   The chair according to any one of claims 1 to 4, wherein the adhesive resin is a translucent resin that transmits light even after curing, and the fibers and the film of the fiber sheet are transparent or translucent. A method for covering a fiber sheet of a concrete structure according to crab.   The fiber sheet coating method for a concrete structure according to any one of claims 2 to 5, wherein the planar material is a non-woven fabric.   A step of applying a wet-compatible first primer to a wet surface of the surface of the concrete structure below the water leakage portion and in a wet state after the film or the water guide member is installed; The fiber sheet coating method for a concrete structure according to any one of claims 1 to 6.   Adhesiveness to the concrete surface on the surface of the concrete structure corresponding to the portion to which the fiber sheet is applied and the surface of the film after the film or the water guide member is installed and before the fiber sheet is attached. The method for coating a fiber sheet of a concrete structure according to any one of claims 1 to 7, further comprising a step of applying a second putty-like primer.   The fiber sheet coating method for a concrete structure according to any one of claims 1 to 8, further comprising a step of fastening the film with an anchor along an outer edge of the film.

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