JP7460452B2 - Sheet lining method for concrete structures - Google Patents

Description

The present invention relates to a sheet lining method for covering concrete structures, such as sewer concrete structures, that may come into contact with sulfuric acid resulting from hydrogen sulfide, by adhering a resin sheet to the concrete structures.

The concrete structures that make up the sewer system come into contact with sulfuric acid, which is produced by the biochemical reaction of sulfide (hydrogen sulfide) contained in the sewage, so the cement component of concrete, which is an alkaline material, corrodes and deteriorates extremely quickly. There's a problem. For this reason, an anti-corrosion coating method has been developed that prevents contact between concrete and sulfuric acid by coating concrete with organic resin.

For example, Patent Document 1 discloses an aqueous resin dispersion for use in water supply and sewerage lining paints, which contains a polymer obtained by emulsion polymerization of a polymerizable monomer mixture containing 95% or more by weight of a polymerizable monomer having a water solubility of less than 0.5 g/100 g of water, 0.1% or more by weight but less than 1.0% by weight of an alkoxysilane group-containing polymerizable monomer, and a reactive surfactant, and contains 5 parts by weight or less of a component that has a minimum film-forming temperature of 5° C. or less, is liquid at 20° C., and has a boiling point of 160° C. or more, relative to 100 parts by weight of the polymer.

However, although the aqueous resin dispersion for water and sewerage lining material paint described in Patent Document 1 is said to have good film-forming properties at low temperatures, it requires work to apply and dry the paint in the sewer, and is environmentally friendly. There was a problem that not only did the work take a long time in a space with poor conditions, but the sewerage system was not available for a long period of time.

In response to these problems, the applicants have developed a sheet lining method in which an unsaturated polyester molded plate mixed with thin glass wool (chopped strand mat, etc.) is attached to sewer concrete structures to provide corrosion resistance. , disclosed the repair/reinforcement material as Patent Document 2.

Patent Document 2 discloses that a reinforcing fiber fabric having at least a portion of high-strength fibers and glass fibers that do not have translucency is impregnated with a translucent resin, and at least a portion of the molded article is A repair/reinforcement material is disclosed that includes a fiber-reinforced resin molded body characterized by having translucency.

However, the sheet lining construction method using a repair/reinforcement material having a fiber-reinforced resin molded body described in Patent Document 2 temporarily fixes the resin sheet using a hook-and-loop fastener, and backfills the gap between the thickness of the hook-and-loop fastener. They were integrated by injecting an adhesive material and curing it. In addition, this hook-and-loop fastener is strong enough to support the weight of the resin sheet and adhesive even on the lower surface (ceiling surface) of the structure, so the mushroom-shaped protrusions were pushed in and fitted together (this application (see Figure 3).

For this reason, it is necessary to accurately push the hook-and-loop fastener part by hand from the outside of the resin sheet, which is time-consuming, and it also causes accidents such as the resin sheet peeling off when the adhesive is injected and the adhesive flowing out due to insufficient pushing of the hook-and-loop fastener. There was a problem that occurred. In other words, (1) the hook-and-loop fasteners will not fit together unless they are firmly pressed together; (2) the hook-and-loop fasteners are special and strong enough to push in mushroom-shaped protrusions, so they have cushioning properties and are difficult to fit securely; (3) If fluid adhesive is injected while the hook-and-loop fasteners are loosely fitted together, the adhesive will become uneven, causing the resin sheet to peel off due to the internal pressure due to the weight, causing an accident in which the adhesive flows out. There were two problems.

Japanese Patent Application Publication No. 2016-204601 JP 2000-274011 A

The present invention was devised in consideration of the above problems, and its purpose is to provide a sheet lining method for concrete structures that can temporarily fix a resin sheet easily and in a short time, without the risk of the temporarily fixed resin sheet peeling off when the adhesive is injected.

The sheet lining method for a concrete structure according to claim 1 is a sheet lining method for a concrete structure in which a resin sheet made of a fiber-reinforced resin molded plate is adhered and covered on a concrete structure that is likely to be corroded by sulfuric acid. a structure magnetizing means installation step of adhering one of the pair of magnetic adhering means to the concrete structure; and a sheet magnetic adhering means installing step of adhering the other of the pair of magnetic adhering means to the back surface of the resin sheet. , a structure hook-and-loop fastener bonding step of bonding a hook-and-loop fastener to the concrete structure; and a sheet hook-and-loop bonding step of bonding a hook-and-loop fastener that fits with the hook-and-loop fastener to the back surface of the resin sheet ; a sheet temporary fixing step of temporarily fixing the resin sheet to the concrete structure using an attachment means and the hook-and-loop fastener; and an adhesive between the resin sheet temporarily fixed in the sheet temporary fixing step and the concrete structure. In the sheet temporary fixing step, the resin sheet is magnetically attached and supported by the magnetic force of the magnetic attachment means, and the fastener is fitted to attach the resin sheet to the concrete structure. It is characterized by temporary fixation .

The sheet lining method for a concrete structure according to claim 2 is a sheet lining method for a concrete structure in which a resin sheet made of a fiber-reinforced resin molded plate is adhered and covered on a concrete structure that is likely to be corroded by sulfuric acid. a structure magnetizing means installation step of adhering one of the pair of magnetic adhering means to the concrete structure; and a sheet magnetic adhering means installing step of adhering the other of the pair of magnetic adhering means to the back surface of the resin sheet. , a sheet temporary fixing step in which the resin sheet is magnetically attached and temporarily fixed using the magnetic force of the magnetic attachment means, and an adhesive is injected between the resin sheet temporarily fixed in the sheet temporary fixing step and the concrete structure. a structure surface fastener bonding step of bonding a surface fastener to the concrete structure; and a sheet surface fastener bonding step of bonding a surface fastener that fits with the surface fastener to the back surface of the resin sheet. and, the hook-and-loop fastener is provided with a fitted state confirmation means that allows confirmation of the fitted state when the hook-and-loop fasteners are fitted together, and the resin sheet is capable of seeing through the fitted state confirmation means. The resin sheet has a light-transmitting property, and the fitting state of the hook and loop fasteners is confirmed from the outside of the resin sheet by the fitting state confirmation means before the injection step.

According to the sheet lining method for concrete structures of claim 1 or 2 , the resin sheet is magnetically attached and temporarily fixed, so there is no need to press the hook-and-loop fasteners together while supporting the resin sheet, and the resin sheet can be easily temporarily fixed. Also, according to the sheet lining method for concrete structures of claim 1 or 2 , whether or not the pair of magnetic attachment means are joined to each other can be easily determined from the outside of the resin sheet by the feel of the resin sheet lifting up, etc., compared to the engagement of hook-and-loop fasteners, and there is little risk of the resin sheet being temporarily fixed poorly. Moreover, according to the sheet lining method for concrete structures of claim 1 or 2 , the pair of magnetic attachment means that are properly joined to each other can be expected to have a certain magnetic force, so there is very little risk of the temporarily fixed resin sheet peeling off when the adhesive is injected.
According to the sheet lining method for concrete structures of claim 1 or 2, since magnetism and hook-and-loop fasteners are used in combination to temporarily fix the resin sheet, the area of the resin sheet that can be temporarily fixed manually by workers can be increased, and the seams of the resin sheet that are weak points for corrosion can be reduced. Therefore, the durability of the concrete structure repaired by the sheet lining method can be further improved. According to the sheet lining method for concrete structures of claim 1, since magnetism and hook-and-loop fasteners are used in combination to temporarily fix the resin sheet, risk can be dispersed, and the risk of the temporarily fixed resin sheet peeling off when the adhesive is injected can be further reduced.

In particular, according to the sheet lining method for concrete structures of claim 2 , the fit of the hook-and-loop fastener used in combination with the magnet can be easily confirmed after the resin sheet is temporarily fixed, further reducing the risk of the temporarily fixed resin sheet peeling off when the adhesive is injected.

FIG. 1 is a perspective view schematically showing a corrosion-resistant resin sheet used in a sheet lining method for a concrete structure according to an embodiment of the present invention. FIG. 2 is a perspective view showing a schematic diagram of a corrosion-resistant and reinforcing type resin sheet used in the sheet lining method. FIG. 3 is a cross-sectional view schematically showing a concrete structure repaired and reinforced by the sheet lining method described above. FIG. 4 is a flow chart showing the procedure of the sheet lining method.

Hereinafter, a sheet lining construction method for a concrete structure according to an embodiment of the present invention will be described. In the sheet lining method for concrete structures according to the embodiment of the present invention (hereinafter sometimes simply referred to as the present sheet lining method), a resin sheet, which will be described later and has been produced in advance at a factory, is bonded to the surface of the target concrete structure. This is a sheet lining method that is applied after forming and is applied to reinforcement and repair work for deteriorated concrete structures.

[Concrete Structure]
First, a concrete structure 1 that is the target of the sheet lining method for concrete structures according to an embodiment of the present invention will be briefly described. The concrete structure 1 that is the target of the sheet lining method is a sewer concrete structure that constitutes a sewer system, and is a reinforced concrete (RC) structure that is likely to corrode and deteriorate the cement component of the concrete, which is an alkaline material, due to contact with sulfuric acid generated by a biochemical reaction of sulfide (hydrogen sulfide) contained in the sewage.

[Resin sheet]
Next, the resin sheet used in this sheet lining method will be described with reference to Figures 1 and 2. Figure 1 is a perspective view showing a corrosion-resistant resin sheet 2 used in the sheet lining method for a concrete structure according to an embodiment of the present invention, and Figure 2 is a perspective view showing a corrosion-resistant and reinforcing resin sheet 2' used in the same method.

The resin sheet 2 according to an embodiment of the present invention is a thin, plate-shaped fiber-reinforced plastics (FRP) substrate made of unsaturated polyester, made by polycondensation of the main raw material acid (saturated dibasic acid/unsaturated dibasic acid) and glycol, dissolved in a transparent resin such as methacrylic resin (PMMA resin) as a matrix resin, and then heated and cured.

The resin sheet according to the embodiment of the present invention is a glass fiber-reinforced plastic (GFRP) molded plate 20 formed by mixing the aforementioned unsaturated polyester resin with layers of glass fiber material such as chopped strand mat or glass fiber fabric.

The resin sheet 2 is, as shown in FIG. 1, a laminated sheet in which a 100 μm vinyl ester resin coating 21 is applied to the surface of a glass fiber reinforced resin molded plate 20 (a surface that may come into contact with sewage, the same applies hereinafter). The overall standard thickness is approximately 4.0 mm.

Note that the reinforcing fibers of the resin sheet according to the present invention are not limited to glass fibers, and other continuous fibers such as carbon fibers, boron fibers, aramid fibers, Keppra fibers, and alumina fibers can be used. Further, the matrix resin of the resin sheet according to the present invention can also be a methacrylic resin, a polycarbonate resin, a vinyl chloride resin, an epoxy resin, or a vinyl ester resin.

However, the matrix resin should be a transparent resin such as methacrylic resin, polycarbonate resin, or vinyl chloride resin (for example, one with a light transmittance of more than 75%) from the viewpoint of checking the injection status of the adhesive, which is the backfilling material. A transparent resin) is preferable. In other words, it is preferable that the resin sheet 2 according to the embodiment of the present invention is a resin molded plate having such a translucency that it is possible to see through the resin sheet 2 as a whole and see the filling state of the adhesive material 6, which will be described later. .

2, a resin sheet 2' according to another embodiment of the present invention can be a glass fiber/carbon fiber reinforced resin molded plate 20' (CFRP: Carbon Fiber-Reinforced Plastic) formed by laminating unidirectional yarns 22' made of carbon fiber in a rectangular shape to a basis weight of 600 g/ ^m2 , mixing the yarns with the above-mentioned glass fiber material, and impregnating the material with a transparent resin. This is particularly effective when the concrete structure to be repaired or reinforced is severely deteriorated and in high need of reinforcement.

However, as shown in FIG. 2, it is preferable that the opaque carbon fiber portion be made into a resin sheet 2' with transparent portions spaced apart in order to visually check the injection status through the resin sheet when injecting the backfill adhesive described below.

[Magnetizing means]
Next, the magnetic attachment means 3 used in this sheet lining construction method will be explained using FIG. 3. FIG. 3 is a cross-sectional view schematically showing a state in which the concrete structure 1 has been repaired and reinforced by the sheet lining method for concrete structures according to the embodiment of the present invention. As shown in FIG. 3, the pair of magnetic attachment means 3 according to the present embodiment consists of a permanent magnet 30 such as a ferrite magnet or a neodymium magnet and a thin steel plate 31, and both are magnetically attached by the magnetic force of the permanent magnet 30. It is about 5mm. The thickness of the magnetic attachment means 3 is set to the required thickness of the adhesive 6 to be injected and filled, and the thickness of the magnetic attachment means 3 functions as a spacer.

Of course, the pair of magnetizing means 3 can also be composed of a pair of permanent magnets 30, 30. However, if the pair of magnetizing means 3 is a pair of permanent magnets 30, 30, the cost will increase, so it is preferable that one of them is made of a thin steel plate 31. Furthermore, by constructing the magnetizing means 3 from a highly corrosion-resistant steel plate such as ZAM steel plate (registered trademark), corrosion can be prevented.

[Hook-and-loop fastener]
Next, the hook-and-loop fastener 4 used in this sheet lining construction method will be explained using FIG. 3. The hook-and-loop fastener used in this sheet lining construction method is a strong hook-and-loop fastener that can support the weight of the resin sheet 2 and adhesive material 6 even on the lower surface (ceiling surface) of the concrete structure 1, as shown in FIG. It is composed of a pair of hook-and-loop fasteners 4, 4'.

The hook-and-loop fasteners 4, 4' are made of resin and are mainly composed of a rectangular base 40, 40' and mushroom-shaped projections 41, 41' that project vertically outward from one side of the base 40, 40'. As shown in FIG. 3, the hook-and-loop fasteners 4 and 4' are opposed to each other with the mushroom-shaped projections 41, 41' abutting against each other, and one hook-and-loop fastener 4' is pressed against the other hook-and-loop fastener 4, so that the mushroom-shaped projections 41, 41' intertwine and engage with each other, and the hook-and-loop fasteners 4 and 4' fit together.

For this reason, as mentioned above, the conventional sheet lining method had the following problems: (1) the hook-and-loop fasteners 4 would not fit together unless they were pressed firmly together, and (2) because the hook-and-loop fasteners 4 push in the mushroom-shaped protrusions 41, they have a cushioning effect, making it difficult to ensure a secure fit. This resulted in the problem that (3) if the adhesive, which is a fluid material, was injected while the hook-and-loop fasteners 4 were not properly fitted together, the adhesive would become unevenly distributed, causing the resin sheet to peel off due to the internal pressure caused by the weight, leading to an accident in which the adhesive spilled out.

Therefore, in order to solve such problems, the hook-and-loop fasteners 4, 4' according to this embodiment are provided with a fitting state confirmation means that allows the fitting state to be confirmed when the two are fitted together.

Specifically, the fitting state confirmation means makes the hook-and-loop fasteners 4 and 4' different translucent colors that transmit light, and when the two are fitted together, the different colors mix together to form an intermediate color between the two colors that can be seen through the resin sheet 2, making it possible to confirm the fitting state. For example, by making the hook-and-loop fastener 4 translucent blue and the hook-and-loop fastener 4' translucent red, the hook-and-loop fasteners 4 and 4' when fitted together will appear purple or pink, making it possible to confirm the fitting state of the two.

In addition, as another fitting state confirmation means, the base bodies 40, 40' of the hook-and-loop fasteners 4, 4' are made at least semi-transparent, and the shape of the arrangement of the mushroom-shaped protrusions 41 of the hook-and-loop fastener 4 and the shape of the array of the mushroom-shaped projections 41 of the hook-and-loop fastener 4' are checked. It is also possible to arrange the mushroom-shaped protrusions 41' in different shapes. When the shape of the array of mushroom-shaped protrusions 41 of the hook-and-loop fastener 4 adhered to the concrete structure 1 can be seen through the resin sheet 2, it is determined that the two are fitted. For example, the mushroom-shaped protrusions 41 of the hook-and-loop fastener 4 are arranged in a circular shape, and the mushroom-shaped protrusions 41' of the hook-and-loop fastener 4' are arranged in a rectangular shape. When the circular arrangement of the mushroom-shaped protrusions 41 can be seen through the resin sheet 2 and the base body 40', it is confirmed that the hook-and-loop fastener 4 and the hook-and-loop fastener 4' are fitted together.

The fitting state confirmation means according to the present invention is not limited to the above-mentioned means, and any means can be used to confirm the fitting state of the hook-and-loop fastener 4 and the hook-and-loop fastener 4'.

[Joint treatment material]
Next, the joint treatment material 5 used in this sheet lining method will be described with reference to Fig. 3. The joint treatment material 5 is a strip-shaped ultraviolet curing tape with a thickness of about 1 mm and a width of about 50 mm, made of a resin with high chemical resistance to sulfuric acid, such as a vinyl ester resin, which conforms to the quality standard "D Type ₂ " for the sheet lining method specified in the Corrosion Inhibition and Anticorrosion Technology Manual for Sewerage Concrete Structures.

The joint treatment material 5 is hardened by roughening the surface of the resin sheet 2 in the area to which the joint treatment material 5 is to be bonded, and is then bonded and irradiated with ultraviolet rays to prevent the joint treatment material 5 from adhering to the resin sheet 2 described above. The adhesive is bonded so that the strength is 0.24 MPa or more.

[Adhesive]
Next, the adhesive 6 used in this sheet lining method will be described with reference to Figure 3. The adhesive 6 is a highly fluid, low-viscosity injection adhesive made of a two-part epoxy resin consisting of a base agent and a hardener. The adhesive 6 is also an epoxy resin that can be hardened at room temperature even in water, and has an adhesive strength to the resin sheet 2 of 1.5 MPa or more even in water, and an adhesion to the concrete structure 1 of 0.24 MPa or more.

[Sheet lining method for concrete structures]
Next, each step of the sheet lining construction method for a concrete structure according to the embodiment of the present invention will be explained along the construction procedure using FIGS. 3 and 4. FIG. 4 is a flowchart showing the construction procedure of the sheet lining construction method for a concrete structure according to the embodiment of the present invention.

(1. Surface treatment process)
First, as shown in Figure 4, this sheet lining method involves surface treatment to remove dirt and deteriorated weak parts from the surface (sewage side surface) of the concrete structure that is the subject of reinforcement/repair work. Perform the process.

Specifically, dirt and deteriorated fragile parts on the surface of the concrete structure 1 are removed using ultra-high pressure water, a disc sander, or the like. After that, a cross-sectional repair material such as putty is applied to the surface of the concrete structure, which has become uneven due to the removal of weak parts, to smooth it out.

(2. Layout and marking process)
Next, as shown in Figure 4, in this sheet lining method, the layout of the resin sheet 2 is determined according to the shape of the concrete structure 1 that is the target of the reinforcement/repair work, and an allocation/marking process is carried out in which the resin sheet 2 is marked on the concrete structure 1 according to the size of the resin sheet 2.

If the construction surface to be reinforced or repaired is a curved surface, the thickness of the adhesive injection and the resin sheet should be taken into account when making the allocation.

In addition, in this step, the positions of the magnetic attachment means 3 (thin steel plate 31) and the hook-and-loop fastener 4 are also marked on both the frame of the concrete structure 1 and the resin sheet 2.

(3. Structure magnetic attachment means installation process and structure hook-and-loop fastener adhesion process)
Next, as shown in FIG. 4, in this sheet lining method, one of the pair of magnetic attachment means 3 described above is adhered to the concrete structure 1 to be subjected to reinforcement/repair work using the putty-like adhesive described above. A structure magnetic attachment means installation process is performed. Specifically, the permanent magnet 30 of the magnetic attachment means 3 is adhered to the position marked out in the marking process of the concrete structure 1 using the above-mentioned putty-like adhesive.

In addition, in parallel with this structure magnetic attachment means installation process, the above-mentioned hook-and-loop fastener 4 is bonded to the concrete structure 1 using the above-mentioned putty-like adhesive made of two-component epoxy resin or the like. Perform the fastener adhesion process. Specifically, the hook-and-loop fastener 4 is adhered to the position marked out in the layout/marking process of the concrete structure 1 using the putty-like adhesive described above.

Of course, it goes without saying that either the structure magnetic attachment means installation step or the structure hook-and-loop fastener bonding step may be performed one after the other.

(4. Sheet magnetic attachment means installation process and sheet hook-and-loop fastener attachment process)
4, in this sheet lining method, a sheet magnetic adhesion means installation process is performed in which the other of the pair of magnetic adhesion means 3 is adhered to the back surface of the resin sheet 2. Specifically, the thin steel plate 31 of the magnetic adhesion means 3 is adhered to the back surface of the resin sheet 2 at the position marked out in the marking process with the putty-like adhesive.

In parallel with this sheet magnetic attachment means installation process, a sheet hook-and-loop fastener attachment process is carried out in which the other of the pair of magnetic attachment means 3 is attached to the back surface of the resin sheet 2 with the putty-like adhesive. Specifically, the hook-and-loop fastener 4' is attached with the putty-like adhesive to the position marked in the allocation and marking process on the back surface of the resin sheet 2.

It goes without saying that the sheet magnetic attachment means installation step and the sheet surface fastener adhesion step may be performed one after the other. In addition, since the sheet magnetic attachment means installation process and the sheet hook-and-loop fastener adhesion process are performed at another location near the concrete structure 1 to be repaired and reinforced, the above-mentioned structure magnetic attachment means installation process and the structure hook-and-loop fastener It is possible to carry out the process simultaneously or before and after the adhesion process, regardless of the bonding process.

(5. Sheet temporary fixing process)
Next, as shown in FIG. 4, in this sheet lining construction method, a sheet temporary fixing step is performed in which the resin sheet 2 is temporarily fixed to the concrete structure 1 using the magnetic attachment means 3 and the hook-and-loop fasteners 4, 4'.

Specifically, a thin steel plate 31 bonded to the back surface of the resin sheet 2 is magnetically attached to a permanent magnet 30 bonded to the surface of the concrete structure 1, and a hook-and-loop fastener 4 bonded to the surface of the concrete structure 1 is attached. A hook-and-loop fastener 4' bonded to the back surface of the resin sheet 2 is pressed to fit them together.

At this time, with the conventional sheet lining construction method, it was difficult to press and fit the hook-and-loop fasteners together while supporting the resin sheet 2. Further, as mentioned above, there is a problem in that the fitting of hook-and-loop fasteners has cushioning properties, making it difficult to fit them securely.

However, in this sheet lining method, a magnetic attachment means 3 is provided, so that the resin sheet 2 can be temporarily fixed to the installation position of the concrete structure 1 by the magnetic force of the permanent magnet 30 simply by bringing the resin sheet 2 close to the installation position of the concrete structure 1.

Therefore, it becomes possible to press the hook-and-loop fasteners 4, 4' against each other without releasing the resin sheet 2, and the resin sheet 2 can be temporarily fixed at the installation position of the concrete structure 1 in a short time.

Furthermore, as described above, since the hook-and-loop fasteners 4, 4' are provided with the above-mentioned fitting state confirmation means, in this step, the resin sheet 2 is transmitted through the hook-and-loop fasteners 4, 4'. The mating status can be checked. Therefore, it is possible to reliably prevent an accident in which the resin sheet 2 peels off due to the internal pressure due to the weight of the adhesive 6 and the like and the adhesive 6 flows out in the injection process described later. Furthermore, since two types of temporary fixing means are provided, the area of the resin sheet 2 can be made larger than that of the conventional sheet lining construction method, and the number of joints between the resin sheets 2, which are weak points for corrosion, can be reduced. can. Therefore, the durability of the repaired concrete structure 1 can be further improved.

(6. Injection preparation process)
Next, as shown in FIG. 4, in this sheet lining construction method, an injection preparation process is performed to prepare for the injection process described later.

Specifically, in order to prevent the adhesive 6 from leaking into the rough joints between the resin sheets 2, the above-mentioned joint treatment material 5 is adhered and sealed, and an injection pipe (not shown) is attached to the temporarily fixed resin sheets 2. and air bleed pipes are installed at the specified 500mm pitch.

(7. Injection process)
Next, as shown in FIG. 4, in this sheet lining method, an injection step is carried out in which the above-mentioned adhesive 6, which is a backfilling material, is injected into the gap between the temporarily fixed resin sheet 2 and the concrete structure 1.

At this time, the magnetic attachment means 3 and hook-and-loop fasteners 4, 4' act as spacers, making it easy to ensure the injection thickness of the adhesive 6, which is the backfill material. Also, unlike other sheet lining methods, there is no need to install anchors or supports on the concrete structure, which not only significantly shortens the construction period but also eliminates the need for drilling holes and damage to the concrete structure 1.

Furthermore, as described above, the resin sheet 2 is a molded resin plate having translucency, so that the filling state of the adhesive material 6 can be seen through the resin sheet 2. Therefore, even if a problem occurs such as the thin steel plate 31 coming off from the permanent magnet 30 or the hook and loop fastener 4' coming off from the hook and loop fastener 4 due to the injection pressure of the adhesive 6, the injection of the adhesive 6 can be stopped. It is possible to resolve the problem by doing so.

(8. Health care)
Next, as shown in FIG. 4, in this sheet lining construction method, a curing period is provided until the adhesive 6 injected in the injection step hardens.

(9. Finishing)
Next, as shown in Figure 4, in this sheet lining method, the injection pipe and air vent pipe installed in the injection preparation process are removed, the injection pipe, etc. are removed, and the surrounding area is deburred and the resin is removed. The surfaces of the sheet 2 and the joint treatment material 5 are finished. Note that by completing this step, the sheet lining construction method for a concrete structure according to the embodiment of the present invention is completed.

[Effects of sheet lining method for concrete structures]
According to the sheet lining construction method for a concrete structure according to the embodiment of the present invention described above, the resin sheet 2 is temporarily fixed to the concrete structure 1 by magnetically attaching it to the concrete structure 1 using the magnetic force of the magnetizing means 3. There is no need to press the hook-and-loop fasteners 4, 4' against each other while supporting them, and the resin sheet 2 can be temporarily fixed easily and in a short time.

In addition, with this sheet lining method, whether or not the permanent magnet 30 of the magnetic attachment means 3 and the thin steel plate 31 are joined can be easily determined from the surface of the resin sheet 2 by the feel of the resin sheet 2 lifting up or sagging, etc., and there is little risk of the resin sheet 2 being poorly fixed.

Furthermore, with this sheet lining method, the magnetic attachment means 3, when properly attached, is expected to have a constant magnetic force from the permanent magnet 30, so there is very little risk of the temporarily fixed resin sheet 2 peeling off when the adhesive 6 is injected.

In addition, according to this sheet lining construction method, since the magnetic attachment means 3 and the hook-and-loop fasteners 4, 4' are used together for temporarily fixing the resin sheet 2, the area of the resin sheet 2 that can be temporarily fixed manually by a worker is The joints of the resin sheet 2, which are weak points for corrosion, can be reduced. Therefore, the durability of concrete structures repaired using the sheet lining method can be further improved.

In addition, according to this sheet lining method, the magnetic attachment means 3 and the hook-and-loop fasteners 4, 4' are used together to temporarily fix the resin sheet 2, so risk can be dispersed and the magnetic attachment means 3 and the hook-and-loop fasteners 4, 4' can function as a fail-safe for each other in the temporary fixation. This further reduces the risk of the temporarily fixed resin sheet 2 peeling off when the adhesive 6 is injected.

And according to this sheet lining method, the fitting state confirmation means makes it easy to check the fitting of the hook-and-loop fasteners 4, 4' used in conjunction with the magnetic attachment means 3 after the resin sheet 2 is temporarily fixed, further reducing the risk of the temporarily fixed resin sheet 2 peeling off when the adhesive 6 is injected.

The sheet lining method for concrete structures according to an embodiment of the present invention has been described in detail above, but the above-mentioned and illustrated embodiments are merely examples of specific embodiments for carrying out the present invention. Therefore, the technical scope of the present invention should not be interpreted in a limited manner based on these.

In particular, as a sheet lining construction method for a concrete structure according to an embodiment of the present invention, the case where the magnetic attachment means 3 and the hook-and-loop fasteners 4, 4' are used together for temporarily fixing the resin sheet 2 has been described as an example, but the resin sheet It is also possible to perform the temporary fixing of 2 using only the magnetic attachment means 3.

Further, the thicknesses and thicknesses exemplified as the resin sheets 2, 2', the magnetic attachment means 3, the hook-and-loop fasteners 4, 4', the joint treatment material 5, and the adhesive material 6 used in the sheet lining method for concrete structures according to the embodiment of the present invention are The dimensions and the like are merely examples of the embodiment, and can be changed as appropriate depending on the scale and deterioration of the concrete structure 1.

1: Concrete structure 2, 2': Resin sheet 20: Glass fiber reinforced resin molded plate 20': Glass fiber/carbon fiber reinforced resin molded plate 21: Vinyl ester resin coating 22': Unidirectional yarn made of carbon fiber 3: Magnetic attachment means 30: Permanent magnet 31: Thin steel plate 4, 4': Hook and loop fastener
40, 40': Base 41, 41': Protrusion 5: Joint treatment material 6: Adhesive material

Claims (2)

A sheet lining construction method for concrete structures in which a resin sheet made of a fiber-reinforced resin molded plate is adhered and coated on a concrete structure that is likely to be corroded by sulfuric acid,
a structure magnetic attachment step of adhering one of the pair of magnetic attachment means to the concrete structure;
a sheet magnetic attachment step of adhering the other of the pair of magnetic attachment means to the back surface of the resin sheet;
a structure hook-and-loop fastener bonding step of bonding a hook-and-loop fastener to the concrete structure;
a sheet hook-and-loop fastener bonding step of bonding a hook-and-loop fastener that fits with the hook-and-loop fastener on the back surface of the resin sheet ;
a sheet temporary fixing step of temporarily fixing the resin sheet to the concrete structure using the magnetic attachment means and the hook-and-loop fastener ;
an injection step of injecting an adhesive between the resin sheet temporarily fixed in the sheet temporary fixing step and the concrete structure,
In the sheet temporary fixing step, the resin sheet is magnetically attached and supported by the magnetic force of the magnetic attachment means, and the fastener is fitted to temporarily fix the resin sheet to the concrete structure. Seat lining construction method for objects. A sheet lining construction method for concrete structures in which a resin sheet made of a fiber-reinforced resin molded plate is adhered and coated on a concrete structure that is likely to be corroded by sulfuric acid,
a structure magnetic attachment step of adhering one of the pair of magnetic attachment means to the concrete structure;
a sheet magnetic attachment step of adhering the other of the pair of magnetic attachment means to the back surface of the resin sheet;
a sheet temporary fixing step of magnetically attaching and temporarily fixing the resin sheet using the magnetic force of the magnetic attaching means;
and an injection step of injecting an adhesive between the resin sheet temporarily fixed in the sheet temporary fixing step and the concrete structure,
a structure hook-and-loop fastener bonding step of bonding a hook-and-loop fastener to the concrete structure;
further comprising a sheet hook-and-loop fastener bonding step of bonding a hook-and-loop fastener that fits with the hook-and-loop fastener on the back surface of the resin sheet ;
The hook-and-loop fastener is provided with a fitted state confirmation means that can confirm the fitted state when the hook-and-loop fasteners are fitted together,
The resin sheet has translucency that allows the fitting state confirmation means to be seen through,
A sheet lining construction method for a concrete structure, characterized in that, before the injection step, the fit between the hook-and-loop fasteners is confirmed from the outside of the resin sheet using the fit state confirmation means.

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