Peeling prevention structure and construction method of peeling prevention structure

Abstract

It prevents the concrete surface from peeling off and the fixings from falling off, and also makes it easy to remove the fixings. [Solution] The structure comprises a cover 3 that covers a fixing device 2 embedded from the surface 1 of a structure toward the interior on the surface 1 side, and a covering body 4 that covers the cover 3 and the surface 1 and is fixed to the surface 1, and the cover 3 is made into a peeling prevention structure 10 that can be removed from the surface 1 by cutting the portion of the covering body 4 around the cover 3.

Description

[Technical Field]

[0001] The present invention relates to a peeling prevention structure and a method for installing the peeling prevention structure. [Background technology]

[0002] Tunnels, bridges, viaducts, retaining walls, buildings, and various other concrete structures deteriorate over time due to factors such as water penetration into the concrete, progress of carbonation, salt damage, and external stress, and if this deterioration is left unchecked, there is a risk that concrete fragments may spall. For this reason, it has been proposed to provide structures on the surface of concrete structures to prevent concrete fragments from spalling (for example, Patent Documents 1 and 2).

[0003] In the anti-peeling structure of Patent Document 1, a primer layer and a composite sheet are applied in that order to the surface of a concrete structure. The primer layer is formed by spraying an aerosol containing epoxy resin and an organic solvent onto the surface. Before this primer layer dries, a composite sheet consisting of an adhesive layer and a fiber sheet layer is placed on the primer layer, and the composite sheet is fixed to the surface by the adhesive strength of the primer layer and the adhesive strength of the adhesive layer.

[0004] In the anti-peeling structure of Patent Document 2, a primer layer and a transparent reinforcing layer are sequentially formed on the surface of a concrete structure. The primer layer is made of epoxy resin or urethane resin. After the primer layer is formed, a paint containing an isocyanurate compound, an isocyanate prepolymer, and an alicyclic diamine compound is applied to form the transparent reinforcing layer. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 7541219 [Patent Document 2] Patent No. 7398208 Summary of the Invention [Problem to be solved by the invention]

[0006] Here, various attachments such as rain gutters, electrical wires, pipes, and communication equipment are sometimes attached to the surface of concrete structures using fasteners such as bolts and nuts. If the concrete deteriorates, these fasteners may fall off along with the surrounding concrete.

[0007] The anti-detachment structures in Patent Documents 1 and 2 can prevent the fasteners from falling, but once the anti-detachment structure is installed to cover the fasteners, there is a problem that the fasteners cannot be easily removed afterwards. Also, because the fasteners are covered with resin or a sheet, there is a problem that it is difficult to inspect them by tapping or visually.

[0008] Therefore, the problem to be solved by this invention is to prevent spalling of concrete from concrete structures and dropping of fasteners, and to facilitate maintenance of the fasteners. [Means for solving the problem]

[0009] In order to solve the above problems, the present invention employs a peeling prevention structure having the following configuration. [Configuration 1] a cover that covers the surface side of the fastener embedded from the surface of the structure toward the interior; a covering body that covers the cover and the surface and is fixed to the surface; The cover has a peeling prevention structure that can be removed from the surface by cutting the portion of the covering body around the cover.

[0010] [Configuration 2] the fastener protrudes from the surface; 2. The peeling prevention structure according to claim 1, wherein the cover is formed in a cup shape so as to cover the entire protruding portion of the fixing tool.

[0011] [Configuration 3] 3. The peeling prevention structure according to claim 1 or 2, wherein the covering is formed in a lattice pattern.

[0012] [Configuration 4] 4. The peeling prevention structure according to any one of configurations 1 to 3, wherein the covering is fixed to the surface by an adhesive interposed between the covering and the surface.

[0013] [Configuration 5] The peeling prevention structure according to configuration 4, wherein the adhesive contains one or more components selected from an acrylic ester resin, colloidal silica, polysiloxane, and a fluorine-based resin compound, and is an uncured material that is applied and then cured.

[0014] [Configuration 6] 6. The peel-preventing structure according to claim 4 or 5, wherein the adhesive material is translucent.

[0015] [Configuration 7] The peeling prevention structure according to any one of configurations 1 to 6, wherein the covering body is made of basalt fiber.

[0016] [Configuration 8] 8. A peeling prevention structure according to any one of configurations 1 to 7, wherein the cover is made of plastic.

[0017] [Configuration 9] 9. The peeling prevention structure according to any one of configurations 1 to 8, wherein the cover is provided with drainage holes to prevent water from accumulating inside the cover.

[0018] [Configuration 10] In the method for installing the peeling prevention structure according to any one of configurations 4 to 9, a temporary fixing step of attaching the cover to the surface; After the temporary fixing step, a primer coating step of applying the adhesive to the surface and the surface of the cover and drying the adhesive; a bonding step of applying another adhesive on top of the dried adhesive after the primer coating step, and pressing the covering body against the surface and the cover before the adhesive dries, and bonding them by the adhesive force of the adhesive; The method for constructing a peeling prevention structure further comprises, after the pasting step, a topcoating step of applying the adhesive material onto the covering body and drying it. [Effects of the Invention]

[0019] The anti-fall structure of this invention is provided with a cover, which can prevent the concrete surface from falling off and the fasteners from dropping off. In addition, the cover can be removed by cutting the area around the cover of the cover fixed to the surface, making it easy to maintain the fasteners. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is a perspective view of a peeling prevention structure according to an embodiment of the present invention; [Figure 2] Side cross-sectional view of Figure 1 [Figure 3] The anti-slip cover shown in Figure 1 is attached to the concrete surface with masking tape. [Figure 4] A diagram showing the state after paint has been applied from the state shown in Figure 3 [Figure 5] A diagram showing the state after further application of paint from the state shown in Figure 4. [Figure 6] This figure shows the state in which the covering body is pressed and adhered from the state shown in FIG. [Figure 7] A diagram showing the state after paint has been applied from the state shown in Figure 6. [Figure 8] FIG. 2 shows the state in which the portion of the flange of the cover of the covering body in FIG. 1 has been cut off and the cover has been removed from the concrete surface. [Figure 9] 2A and 2B show variations of the cover used for the fully embedded fixture; DETAILED DESCRIPTION OF THE INVENTION

[0021] An embodiment of the present invention will be described with reference to the drawings. As shown in Fig. 1, a spalling prevention structure 10 of this embodiment is used to prevent concrete fragments from falling due to aging on a concrete surface 1 (hereinafter simply referred to as surface 1) of tunnels, bridges, viaducts, retaining walls, buildings, and various other structures (concrete structures), and to prevent fasteners 2 embedded from falling from surface 1 toward the interior. Fasteners 2 are used when attaching various attachments to surface 1, such as gutters, electric wires, piping, and communication equipment.

[0022] As shown in Figure 2, the fixing device 2 in this embodiment is a bolt, and it is assumed that the head of the bolt protrudes from the surface 1 and the threaded portion is embedded in the surface 1. However, fixing devices 2 also include those that do not protrude from the surface 1 and stud bolts, and are not limited to bolts but also include nuts, metal fittings, pins, etc. for fixing an attached object to the surface 1.

[0023] As shown in Figure 1, the peeling prevention structure 10 includes a cover 3 that covers the fastener 2 on the surface 1 side, a covering 4 that covers the cover 3 and the surface 1, and an adhesive 5 (see Figure 2) that secures the covering 4 to the surface 1. The cover 3 is formed in a cup shape so as to cover the entire portion of the fastener 2 that protrudes from the surface 1. The cover 3 is formed in a rectangular cup shape (a concave shape that opens to the surface 1 side). Because the cover 3 is formed in a cup shape beforehand, it can be used as is, and installation is easy.

[0024] A flange 6 is provided on the periphery of the opening of the cover 3. The flange 6 protrudes laterally around the entire periphery of the opening of the cover 3 and faces and contacts the surface 1. The cover 3 is attached to the surface 1 with masking tape 7. The cover 3 can also be attached with adhesive tape or glue instead of the masking tape 7. The cover 3 is provided with drainage holes 8 (see Figure 8) that allow water that accumulates inside the cover 3 to drain. Therefore, even if water seeps in through the gap between the surface 1 and the cover 3, the water is unlikely to stagnate, and the fastener 2 is unlikely to corrode. Note that, from the perspective of easy water drainage, the drainage holes 8 are preferably provided near the vertically lower portion of the cover 3 when installed on a structure.

[0025] The cover 3 may be shaped as a circle, an oval, a triangle, or the like. The cover 3 is made of plastic (for example, polystyrene). This reduces the cost of the cover 3. However, the cover 3 may also be made of aluminum, stainless steel, iron, or the like.

[0026] As shown in FIG. 1, the covering 4 is a sheet-like material and is provided in close contact with the surface of the cover 3 and the surface 1. The covering 4 is formed in a lattice pattern. The covering 4 is formed by weaving warp threads and weft threads so that they alternately rise and fall (so-called plain weave). The covering 4 has gaps between adjacent warp threads and also between adjacent weft threads, forming a rectangular lattice pattern. The lattice pattern is set smaller than the fasteners 2 so that dropped fasteners 2 cannot pass through. Because the covering 4 is formed in a lattice pattern, the covered surface 1 has good breathability, and the condition of the surface 1 can be visually confirmed.

[0027] The covering 4 in this embodiment is made of basalt fiber. Basalt fiber is a fiber made by melting basalt and then extruding and spinning it, and is a material with excellent heat resistance and weather resistance. This makes the covering 4 suitable for outdoor use. The covering 4 is highly flexible and can be attached to complex surfaces, such as those with protrusions (bolt heads). The material and thickness are set so that the covering 4 can be cut with scissors. The covering 4 has a lattice (mesh) pattern, making it easy to cut.

[0028] The covering 4 is not limited to basalt fiber, and can be made of reinforced fibers such as glass fiber, carbon fiber, plant fiber, aramid fiber, polyethylene fiber, polyester fiber, metal fiber, ceramic fiber, etc. Also, it is possible to use a sheet material made of synthetic resin such as polyethylene, vinylon, polyester, nylon, or polypropylene, or a sheet material made of metal such as aluminum, iron, or copper.

[0029] As shown in FIG. 2, paints 5 (5a, 5b, 5c) are used as the adhesive 5 in this embodiment (hereinafter, the adhesive 5 will be referred to as paint 5). The paints 5 (5a, 5b) are interposed between the surface 1 and the coating material 4, and fix the coating material 4 to the surface 1. In addition, paint 5 (5c) is also applied to the surface of the coating material 4 (the surface opposite to the surface 1). The paint 5 has adhesive properties, and is applied as an uncured material and then cured. The paint 5 in this embodiment is translucent. The paint 5 mainly contains acrylic ester resin, colloidal silica, polysiloxane, and a fluorine-based resin compound.

[0030] This paint 5 is water-based, making it friendly to both the installer and the environment. It is also water vapor permeable, allowing moisture that has penetrated from the back surface to easily escape, preventing corrosion of rebar, bolts, and nuts. The covering 4 is fixed to the surface 1 using an adhesive 5 rather than a fastening member, making the fixing process simple. Furthermore, since paint 5 is used as the adhesive 5, there is no need to apply a separate adhesive, reducing the number of work steps. Furthermore, since paint 5 is translucent, the condition of the surface 1 can be visually confirmed.

[0031] Here, the paint 5 may contain one or more components selected from acrylic ester resin, colloidal silica, polysiloxane, and fluorine-based resin compound. Furthermore, the paint is not limited to a paint containing acrylic ester resin as the main component, and other synthetic resin paints (e.g., epoxy resin-based paint, ester resin-based paint, etc.) can also be used. Furthermore, although paint is used as the adhesive 5, adhesives, adhesive sheets, etc. can also be used in addition to paint.

[0032] The method for constructing the peeling prevention structure 10 will now be described. First, as shown in Figure 3, a temporary fixing process is performed in which the cover 3 is attached to the surface 1. The cover 3 is attached with masking tape 7 in contact with the surface 1 so as to cover the fixing tool 2 (see Figure 2). After the temporary fixing process, as shown in Figure 4, a primer coating process is performed in which paint 5a is applied to the surface 1, the surface of the cover 3, and the surface of the masking tape 7. At this time, the applied paint 5a is dried to form a first paint layer 5a.

[0033] After the priming process, an attachment process is performed in which the covering body 4 is attached, as shown in Figures 5 and 6. Paint 5b is further applied on top of the first paint layer 5a, and before the paint 5b dries, the covering body 4 is pressed against the surface 1 and the surface of the cover 3, and the covering body 4 is attached by the adhesive force of the paint 5b. At this time, the covering body 4 is made to adhere closely to the cover 3. With the covering body 4 attached, the applied paint 5b is dried to form the second paint layer 5b. After the attachment process, a topcoat process is performed in which paint 5c is further applied on top of the covering body 4, as shown in Figure 7. At this time, the applied paint 5c is dried to form the third paint layer 5c.

[0034] As shown in FIG. 8 , this embodiment includes a covering 4, which prevents the concrete surface 1 from peeling and the fastener 2 from falling off. Furthermore, the covering 3 can be removed by cutting the area around the cover 3 of the covering 4 fixed to the surface 1. Specifically, because no adhesive 5 is provided between the flange 6 and the surface 1, the cover 3 can be removed from the surface 1 by cutting the entire periphery of the flange 6 and the covering 4 covering that area with scissors or a cutter, facilitating maintenance of the fastener 2. After performing maintenance on the fastener 2, the above-described temporary fixing process, priming process, attachment process, and topcoat process can be repeated to install the peeling prevention structure 10, thereby again preventing the surface 1 from peeling and the fastener 2 from falling off. In the second installation, a new covering 4 slightly larger than the cut area is used to install the peeling prevention structure 10. The new covering 4 is attached to the surface 1, covering the entire periphery of the cut portion of the covering 4 installed in the initial installation.

[0035] The spalling prevention structure 10 of this embodiment is provided to prevent spalling on the surface 1 facing the side of a concrete structure, but the present invention can also be applied to the side, inclined, downward-facing, upward-facing, and curved surfaces of a concrete structure. It can also be applied to structures other than concrete, such as steel structures and wooden structures. In other words, it can also be applied to structures in which the fastener 2 is embedded in steel or other materials rather than in concrete.

[0036] The spalling prevention structure 10 can also be installed in areas of structures that straddle concrete surfaces and surfaces other than concrete (such as metal surfaces). For example, when water leakage occurs under a deck slab or in a tunnel, a stainless steel water guide plate is installed and the spalling prevention structure 10 is installed along with the water guide plate. In this case, before the temporary fixing process, a paint containing a water-based epoxy resin is applied to the metal surface and concrete surface of the water guide plate as a primer for metal adhesion. Then, the temporary fixing process, priming process, attachment process, and top coating process are performed in the order described above. In this way, the spalling prevention structure 10 can be installed continuously even when the construction surface straddles concrete and metal.

[0037] Furthermore, the cover 3 in the embodiment is cup-shaped as shown in Fig. 2, but when the entire fastener 2 is embedded in the concrete structure (the fastener 2 does not protrude from the surface 1) as shown in Fig. 9, it can be in the shape of a flat sheet. In this case, the cover 3 can be manufactured more easily.

[0038] Furthermore, a second covering body, separate from covering body 4, can be provided between first paint layer 5a and second paint layer 5b. The second covering body is provided so as to cover fastener 2. The second covering body is smaller than covering body 4. The second covering body is provided over a 100 mm square area around fastener 2. The second covering body is a nonwoven fabric made of vinylon nonwoven fabric and glass fiber, and is formed so that the mesh size is smaller (the mesh openings are smaller) than that of covering body 4, which is provided in the attachment process. This makes it possible to prevent smaller fasteners 2 and the like from falling off.

[0039] The embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is defined by the claims, not by the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0040] 1 surface 2 Fixtures 3 Cover 4 Covering 5 Glue 8 Drain holes 10 Anti-peeling structure

Claims

1. a cover (3) that covers the fixing device (2) embedded from the surface (1) of the structure toward the inside, on the surface (1) side; The device includes the cover (3) and a covering body (4) that covers the surface (1) around the cover (3) and is fixed to the surface (1), The cover (3) does not engage with the fastener (2) but contacts the surface (1) around the fastener (2), and the cover (3) prevents the fastener (2) from falling when it is separated from the structure; The cover (3) is detachable from the surface (1) by cutting the portion of the covering body (4) around the cover (3).

2. The fastener (2) protrudes from the surface (1), 2. The peeling prevention structure according to claim 1, wherein the cover (3) is formed in a cup shape so as to cover the entire protruding portion of the fixing device (2).

3. 3. The peeling prevention structure according to claim 2, wherein the cover (3) is provided with a flange (6) that protrudes laterally around the entire periphery of the periphery.

4. 4. The peeling prevention structure according to claim 1, wherein the covering body (4) is formed in a lattice shape.

5. A peeling prevention structure according to any one of claims 1 to 3, wherein the covering (4) is fixed to the surface (1) around the cover (3) by an adhesive (5) interposed between the covering (4) and the surface (1).

6. The peeling prevention structure according to claim 5, wherein the adhesive (5) contains one or more components selected from acrylic ester resin, colloidal silica, polysiloxane, and fluorine-based resin compound, and is formed by applying an uncured material and then curing it.

7. 6. The peeling prevention structure according to claim 5, wherein the adhesive (5) is semi-transparent.

8. 4. The peeling prevention structure according to claim 1, wherein the covering body (4) is made of basalt fiber.

9. 4. The peeling prevention structure according to claim 1, wherein the cover (3) is made of plastic.

10. 4. The peeling prevention structure according to claim 1, wherein the cover (3) is provided with drainage holes (8) to prevent water from accumulating inside the cover (3).

11. The method for installing the peeling prevention structure according to claim 5, a temporary fixing step of attaching the cover (3) to the surface (1); After the temporary fixing step, a primer coating step is performed in which the adhesive (5) is applied to the surface (1) around the cover (3) and the surface of the cover (3) and dried. a bonding step of applying another adhesive (5) on the dried adhesive (5) after the primer coating step, and pressing the covering body (4) against the surface (1) and the cover (3) before the adhesive (5) dries, thereby bonding them by the adhesive force of the adhesive (5); The method for constructing a peeling prevention structure further comprises a topcoating step of applying the adhesive (5) onto the covering body (4) and drying it after the pasting step.

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