KR102125899B1 - Water-Proof method for exposed concrete roof using multiple synthetic resin sheets - Google Patents

Abstract

The present invention relates to a concrete waterproofing method using multiple synthetic resin sheets, which is able to connect multiple synthetic resin sheets with excellent flexibility while preventing external moisture from penetrating, and to conveniently, rapidly perform waterproofing construction on a side surface of concrete connected to a floor surface as well as the concrete floor surface. According to the present invention, the waterproofing method comprises: a step of placing multiple synthetic resin sheets to be overlapped on a part of a side surface adjacent to the concrete floor surface; a step of spreading a primer on the border of the synthetic resin sheets overlapped with and adjacent to each other; a step of aligning a flow layer formed in a longitudinal direction in the center of a rear surface of a strap-shaped fiber sheet having a certain width on the border of the synthetic resin sheets with the primer spread on the border of the synthetic resin sheets, interposing the flow layer, and attaching an adhesive layer formed in a longitudinal direction on both sides to each of the adjacent synthetic resin sheets; and a step of impregnating the fiber sheet with synthetic resin.

Description

Water-Proof method for exposed concrete roof using multiple synthetic resin sheets}

The present invention relates to a method for waterproofing concrete, such as a rooftop of a building, and more specifically, by connecting a plurality of synthetic resin sheets having excellent flexibility to prevent external moisture from penetrating the floor surface of the flat concrete, as well as at a right angle to the side surface. It relates to a concrete waterproof method that can be installed quickly and easily to the connection portion of the floor surface to be connected.

Waterproof construction is performed on the concrete floor surface such as the roof of the building to prevent rainwater or moisture from entering the building. In the waterproof construction of concrete, a number of waterproof sheets made of synthetic resin are installed on the concrete surface to prevent moisture or moisture from inside the building. To prevent penetration.

As a method of waterproofing concrete using a plurality of waterproof sheets, technologies such as Korean Patent Registration Nos. 10-1447572 and 10-0885944 have been disclosed. Patent No. 10-1447572 is a technology for waterproofing a concrete surface by thermally welding the installed fixing member and a plurality of waterproof sheets after installing a separate fixing member on the concrete surface to be waterproof, and a separate fixing member on the concrete surface There is a problem that it takes a lot of time to install the installation and heat-sealing the fixing member and a plurality of waterproof sheets.

In addition, Korean Patent Registration No. 10-0885944 discloses a waterproof structure in which a plurality of waterproof sheets are riveted and a sheet connecting portion is formed of a synthetic resin film. Such a waterproof structure reduces construction time compared to the above-described thermal welding method, but has a burden of connecting sheets using a separate rivet. In particular, the waterproof sheet is subject to heat shrinkage or expansion as it is exposed to outside air such as direct sunlight. There is a problem that moisture or moisture penetrates into the connection part when the stress is concentrated on the part connected by the rivet and is opened or torn.

In particular, in a structure in which a concrete floor surface and a side surface are connected, such as a rooftop, the connection part of the concrete floor surface which is perpendicular to the side surface, of course, must be waterproofed, but bent at 90° with the flat bottom surface. The installation surface of the connecting portion of the bottom surface is different, and waterproof construction is separately performed.

Republic of Korea Registered Patent Publication No. 10-1447572 (Name of the invention: a method of attaching a waterproof sheet for concrete and a concrete waterproof structure using the same) Republic of Korea Registered Patent Publication No. 10-0885944 (Invention name: concrete surface waterproof structure and its construction method)

The present invention was devised to improve the waterproofing method of the conventional concrete, and the present invention connects a plurality of synthetic resin sheets having excellent flexibility so that external moisture does not penetrate, so that the bottom surface of the flat concrete, as well as the right angle to the side, are connected. The object of the present invention is to provide a concrete waterproofing method that can be constructed quickly and easily on the connecting part of the floor.

In order to solve the above technical problem, a method of waterproofing concrete according to an aspect of the present invention includes laying a plurality of synthetic resin sheets so that a portion of side surfaces adjacent to the bottom surface of the concrete are superimposed and laminated. The step of applying a primer to the boundary of the adjacent synthetic resin sheet, and the fluid layer formed in the longitudinal direction in the center of the back surface of the band-shaped fiber sheet having a predetermined width at the boundary of the synthetic resin sheet coated with the primer is the boundary of the synthetic resin sheet. And aligning the adhesive layers formed on both sides in the longitudinal direction through the fluidized bed, and adhering to the adjacent synthetic resin sheets, and impregnating the fiber sheets with the synthetic resin.

In the present invention, the release layer provided on the back surface of the fiber sheet can be removed to adhere the exposed adhesive layer to each adjacent synthetic resin sheet.

Method for waterproofing the concrete according to another aspect of the present invention, the step of installing a bent metal plate along the connecting portion of the bottom surface and side of the concrete, and laying a synthetic resin sheet to cover the metal plate on the concrete floor surface Step, the step of applying a primer on the laid synthetic resin sheet, and bonding the fiber sheet on the metal plate installed on the concrete side and the primer coated resin sheet, and impregnating the fiber sheet with synthetic resin, Including.

In the present invention, the step of filling the gap between the metal plate material and the side may further include.

In the present invention, the primer may be applied in a thickness of 0.5 to 2 mm with a polyurethane resin in which the weight ratio of isocyanate and polyol compound is 1:1 to 1:5.

In the present invention, the fiber sheet may be woven into a composite yarn composed of a polyurethane fiber and a covering yarn in which ultra-high molecular weight polyethylene fibers are wound with 400 to 800 twists around the examination.

In the present invention, the composite yarn may have an elongation of 100 to 180% and a tensile strength of 15 g/de or more.

In the present invention, the thickness of the fiber sheet may be 120g/m2 to 180g/m2.

In the present invention, the fiber sheet may be impregnated with a polyurethane resin having a viscosity of 2,000 to 4,000 CP.

Method for waterproofing the concrete according to another aspect of the present invention, the step of installing the bent metal plate along the connecting portion of the bottom surface and the side of the concrete, and the metal plate on the bottom surface of the concrete and the bottom surface of the exposed concrete The step of laying a plurality of synthetic resin sheets so that a portion of the adjacent side portions are superimposed and laminated so as to cover, and applying a primer to the boundary between the synthetic resin sheet and the adjacent synthetic resin sheet overlapped and laminated on the metal plate, and the primer applied. Bonding the fiber sheet to the synthetic resin sheet, impregnating the fiber sheet with synthetic resin, and filling the gap between the metal plate and the side surface.

According to the present invention, a plurality of synthetic resin sheets having excellent flexibility can be constructed to prevent moisture or moisture from infiltrating from the outside without being widened or separated from each other by heat shrinkage or expansion by external air. As well as the bottom surface, it is possible to easily and effectively construct the connection portion of the bottom surface that is connected at right angles to the side surface.

1 is a flowchart of a waterproofing method according to an embodiment of the present invention.
2 is a view showing a cross-section of a concrete floor surface constructed according to an embodiment of the present invention.
3 is an exploded perspective view showing a state in which multiple layers are sequentially stacked on a concrete floor by a waterproof method according to an embodiment of the present invention.
4 is a flowchart of a method of waterproofing a connection portion of a concrete floor surface connected to a side surface according to another embodiment of the present invention.
5 is a view showing a cross-section of a concrete floor connecting portion constructed according to another embodiment of the present invention.
6 is a view showing an example in which a waterproof construction is made on a concrete floor according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

This embodiment is provided to more fully explain the present invention to those having average knowledge in the art, the shape of the elements in the drawings, the size of the elements, the spacing between the elements, etc. to emphasize a more clear description For this, it can be exaggerated or reduced.

In addition, when it is determined that the technical features of the present invention may unnecessarily obscure the technical features of the present invention, as a matter of ordinary skill in the art, such as known functions or known configurations, which are related in principle in describing the embodiments. The description will be omitted.

1 is a flow chart of a waterproofing method according to an embodiment of the present invention, Figure 2 is a view showing a cross-section of the concrete floor surface (H) constructed according to the waterproofing method of Figure 1, Figure 3 is a waterproofing of Figure 1 It is an exploded perspective view showing a state in which multiple layers are sequentially stacked on a concrete floor surface H by a method.

Referring to this, the present invention is a step of laying a plurality of synthetic resin sheets (11,12) on the concrete floor surface (H) (S110), the step of applying a primer on the boundary of the adjacent synthetic resin sheet (11,12) ( S120), the step of adhering the fiber sheet 30 to the surface of the sheet coated with the primer (S130), the step of impregnating the bonded fiber sheet 30 with synthetic resin (S140), and the impregnated fiber sheet 30 It comprises a step (S150) of applying a composite ceramic resin.

Step S110 is a step of laying a plurality of synthetic resin sheets (11,12) on the concrete floor surface (H), by spraying air or water, etc. of the concrete floor surface (H) before laying the synthetic resin sheet (11,12) It is desirable to clean foreign objects such as dust and oil. When the concrete floor surface H is cleaned like this, a plurality of synthetic resin sheets 11 and 12 are laid, and the synthetic resin sheets 11 and 12 are made of a synthetic resin material having ductility, so that flexibility is excellent. It can be easily installed regardless of the concrete surface (H) on which it is curved or uneven. Here, in the synthetic resin sheets 11 and 12, the side surfaces of the adjacent synthetic resin sheets 11 and 12 partially overlap each other vertically as shown in FIGS. 2 and 3 so that the concrete surface H is not exposed. And stacked to be stacked. As the synthetic resin sheets 11 and 12, PP, PE, PVC, EVA, and urethane resin sheets may be used.

The next step S120 is a step of applying a primer to the boundary of the neighboring synthetic resin sheets 11 and 12, as shown in FIGS. 2 and 3, of the overlapping laminated adjacent synthetic resin sheets 11 and 12. The primer layer 20 is formed by applying a primer to the boundary. The primer layer 20 is applied to improve adhesion to the fiber sheet 30 adhered to the upper portion, and to prevent moisture or moisture from penetrating the boundary of the synthetic resin sheets 11 and 12.

Here, the primer is applied in a thickness of 0.5 ~ 2mm, if formed less than 0.5mm it is difficult to form a flat surface against the fine irregularities of the boundary of the synthetic resin sheet (11,12), if formed more than 2mm curing and drying time There is a problem that the construction time increases by increasing. In addition, as the material of the primer, one or more resins selected from epoxy resins, polyurethane resins, acrylic resins, polyurea resins, and polyurethane-polyurea resins can be used. The weight ratio of the main isocyanate and the curing agent polyol compound is Two-component polyurethane resins having a hardness of 1:1 to 1:5 (Shore A30 to 100) are preferred. At this time, if the content of the isocyanate is less than the above range, the adhesion is poor, and if the content of the polyol is less than the above range, there is a problem that the wear resistance is lowered.

And the following step S130 is a step of adhering the belt-shaped fiber sheet 30 in the longitudinal direction to the boundary of the synthetic resin sheets 11 and 12 coated with the primer. In the center of the back surface of the fiber sheet 30, a fluidized layer 31 formed in the longitudinal direction and an adhesive layer coated with an adhesive so as to be adhered to the synthetic resin sheets 11 and 12 along both sides of the longitudinal direction through the fluidized layer 31 (32) and a release paper (33) detachable from the adhesive layer (32) are formed by being stacked on the back surface, and attached by the adhesive layer (32) exposed by removing the release paper (33) on the back surface of the synthetic resin sheets (11, 12). do.

Here, the adhesive layer is formed along both sides of the longitudinal direction through the fluidized layer 31 formed in the longitudinal direction in the center of the back surface of the fiber sheet 30, the fluidized layer 31 is a synthetic resin sheet 11 that is thermally contracted or expanded by the outside air , Forming a space through which the boundary portion of 12 may flow, the boundary portions of the synthetic resin sheets 11 and 12 are aligned with the fluidized bed 31 of the fiber sheet 30, and the adhesive layers 32 on both sides are adjacent to each other. It is bonded to the synthetic resin sheet (11,12). The adjacent synthetic resin sheets 11 and 12 are secured by the fibrous sheet 30 such that the fluidized bed 31 that can move in the width direction is secured, so that the synthetic resin sheets 11 and 12 exposed to the outside are contracted by heat. Even if it expands, it can flow, so that the boundary portions of the adjacent synthetic resin sheets 11 and 12 are not opened or separated.

On the other hand, the fiber sheet 30 is also stretched in response to shrinkage or expansion of the synthetic resin sheets 11 and 12 exposed to the outside air in response to heat, and also has a flexible screening so that it is not broken or damaged by surface friction, and around the central sign screening. The composite yarn made of high-strength fiber covering yarn consists of warp and weft yarns. Accordingly, when the synthetic resin sheets 11 and 12 contract or expand due to heat, as the fiber sheets 30 are freely stretched and contracted by elastic examination, with the fiber sheets 30 adhered to the synthetic resin sheets 11 and 12, It is possible to prevent the separation or separation of the boundary portion by stress concentrated excessively on the boundary portion, and also has durability without being broken or damaged by friction of the surface of the fiber sheet 30.

Stretchable screenings can include polyurethane, polystyrenethane, SBS (styrene-butadiene-styrene), SBR (styrene butadiene rubber), PDMS (polydimethylsiloxane), or silicone-based rubber materials. Polyurethane fibers having an elastic modulus and a high elastic recovery rate and made of the same material as the impregnated resin to be described later are excellent.

The covering yarn is made of fibers having excellent strength so as to be durable against external force, and for this, ultra high molecular weight polyethylene (UHMWPE) fibers may be used. The covering yarn is preferably covered with 400 to 800 kinks (TM) around the screening so that the impregnation resin is impregnated smoothly. If the number of twists of the covering yarn is less than 400, there is a problem that the strength of the fiber sheet 30 is lowered, and if the number of twists exceeds 800, it is difficult to impregnate with the screening and a problem of double twist is caused by a high number of twists. The composite yarn made in this way has an elongation of 100 to 180%, and a tensile strength of 15 g/de or more, so that both stretchability and tensile strength are excellent. In addition, the thickness of the fiber sheet 30 is made of 120g/m2 to 180g/m2, where the durability decreases when the fiber sheet 30 is smaller than 120g/m2, and if it is larger than 180g/m2, absorption of the impregnated resin described later is Is limited.

Subsequent step S140 is a step of impregnating the fiber sheet 30 adhered to the synthetic resin sheets 11 and 12 with synthetic resin in step S130 described above. The fiber sheet 30 impregnated with the synthetic resin has moisture or moisture from the outside. It is possible to prevent penetration into the voids of the sheet 30. Here, the synthetic resin used for impregnation has a low viscosity of 2,000 to 4,000 CP at room temperature (25°C) to facilitate penetration into the pores of the fiber sheet 30, and forms a fiber sheet 30 with excellent adhesion. It is preferable that the same polyurethane as the screening of the composite yarn is used. By forming a coating film on the surface of the polyurethane-impregnated resin fiber sheet 30, not only to prevent the penetration of moisture from the outside, but also to increase the elasticity of the fiber sheet 30, thermal shrinkage or expansion of the synthetic resin sheet (11,12) Depending on whether it can be stretched or expanded.

Subsequently, step S150 is a step of forming a top coating layer 40 by applying a composite ceramic resin on the impregnated fiber sheet 30, and the fiber sheet 30 impregnated with synthetic resin is cracked and deteriorated by direct sunlight. It is applied to prevent development. To this end, the composite ceramic resin is a ceramic powder, such as zeolite, dolomite, magnesite, silica sand, and mack-stone, which has heat-shielding functions, and is mixed and dispersed, and an acrylic resin that improves workability and flowability, and an epoxy resin that improves the adhesion of the coating film. And metal powders such as copper powder, copper alloy powder, and iron alloy powder, which improve the hardness of the coating film and impart corrosion resistance. Here, the top coating layer 40 is preferably 20 to 30% by weight of ceramic powder, 25 to 35% by weight of acrylic resin, 20 to 25% by weight of epoxy resin, and 10 to 20% by weight of metal powder. If it is less than wt%, it is difficult to expect to improve the heat shielding function and wear resistance, and if it exceeds 30 wt%, the viscosity rises, making it difficult to form a film. In addition, when the acrylic resin is less than 25% by weight, the viscosity of the paint increases, and when it exceeds 35% by weight, the strength of the coating film decreases. In addition, if the epoxy resin is less than 20% by weight, the adhesiveness deteriorates, and when it exceeds 25% by weight, the content of other components decreases, thereby deteriorating the physical properties. In addition, when the metal powder is less than 10% by weight, the hardness and anticorrosive function of the coating film are not expressed, and when it exceeds 20% by weight, the viscosity increases and workability is difficult.

The waterproof method made as described above is simple and quick to prevent moisture or moisture from penetrating from the outside without opening or separating the heat shrinking or expanding the plurality of synthetic resin sheets (11, 12) having excellent flexibility on the concrete floor (H). It can be constructed.

On the other hand, the above-described concrete waterproofing method is suitable for a concrete floor (H) that is a horizontal plane, whereas the connecting portion of a concrete floor (H) that is connected to a concrete side (V) that is a vertical plane, such as a roof of a building, is approximately 90°. As the edges are formed, a waterproof method different from the flat concrete floor surface H is required.

Therefore, in another embodiment of the present invention is shown in Figures 4 and 5 in the method of waterproofing the connecting portion of the concrete bottom surface (H) connected to the side (V). 4 is a flowchart of a method of waterproofing a connection portion of a concrete floor surface H connected to a side surface V according to another embodiment of the present invention, and FIG. 5 is a connection of a concrete floor surface H constructed according to FIG. 4 It is a diagram showing a section of a site.

Referring to FIG. 4, the step of installing the bent metal plate 50 according to the connecting portion of the side surface V and the bottom surface H (S110), the metal plate 50 disposed on the concrete floor H The step of laying the synthetic resin sheet 13 (S120), the step of applying a primer on the laid synthetic resin sheet 13 (S130), the metal installed on the concrete side V and the primer on the synthetic resin sheet 13 Bonding the fiber sheet 30 on the plate material 50 (S140), impregnating the fiber sheet 30 with synthetic resin (S150), and applying a composite ceramic resin on the impregnated fiber sheet 30 Including (S160).

In the embodiment of FIGS. 4 and 5, the step S110 of installing the bent metal plate 50 on the connecting portion of the concrete bottom surface (H) and the side surface (V) is further added, compared to the above-described embodiment, and the concrete bottom surface. A synthetic resin sheet 13 is laid to cover the metal plate 50 installed in (H). At this time, the above-described primer may be applied for adhesion between the metal plate 50 and the synthetic resin sheet 13. Like the above-described embodiment on the bonded synthetic resin sheet 13, primer application, fiber sheet 30 adhesion, synthetic resin impregnation of the fiber sheet 30, and composite ceramic resin application are sequentially performed.

Therefore, in the embodiment of FIGS. 4 and 5, unlike the fiber sheet 30 being constructed on the concrete surface, which is the horizontal plane described above, the fiber sheet (H) and the side surface V connected to each other at approximately 90° ( As 30) is adhered, the fiber sheet 30 adhered to the side V by thermal contraction and expansion of the synthetic resin sheet installed on the bottom surface H is pulled apart or spaced apart, but the metal sheet 50 underneath It can stably waterproof the bottom surface. As the metal plate 50, a steel plate plated with any one of zinc (Zn), nickel (Ni), and chromium (Cr) that is not corroded by external moisture or moisture penetration is preferable. As shown in FIG. 5, the metal plate 50 is fixed to the side bolt V with an anchor bolt 60, and a side surface to prevent penetration of moisture into a gap with the side bolt V fixed with the anchor bolt 60. It is preferable to form a sealing layer 70 filling silicon with a gap between V).

6 is a view showing an example in which a waterproof construction is made on a concrete floor surface (H) according to the present invention, the metal plate 50 bent along the connecting portion of the bottom surface (H) and side (V) of the concrete Install it. At this time, the metal plate 50 can be fixedly installed on the side bolts V with an anchor bolt 60. And, the metal plate 50 installed on the concrete floor surface H and the exposed concrete floor surface H A plurality of synthetic resin sheets (11, 12, 13) are installed along the longitudinal direction to cover, where the synthetic resin sheets (11, 12, 13) are laid so that the adjacent sheets and a part of the side surfaces are overlapped and laminated, and are laminated. A primer is applied onto the synthetic resin sheet 13 placed on the boundary of the sheets 11 and 12 and the metal plate 50. Then, a fiber sheet (a) is applied to the synthetic resin sheets 11, 12 and 13 coated with the primer. 30) is adhered, the fluidic layer 31 of the fiber sheet 30 is aligned on the boundary of the synthetic resin sheet so that the adhesive layers 32 on both sides are adhered to the adjacent synthetic resin sheets 11 and 12, respectively, and the bottom surface H ) And the connecting portion of the side (V) is adhered to the synthetic resin sheet 13 installed on the metal plate material 50 and the metal plate material 50 installed on the side surface. Lastly, the gap between the metal plate 50 fixed to the anchor bolt 60 and the side V is filled with silicone to finish.

As described above, the present invention is to construct a plurality of synthetic resin sheets (11, 12, 13) having excellent flexibility in the bottom surface (H) of concrete to prevent moisture or moisture from penetrating from the outside without being widened or spaced apart even through heat shrinkage or expansion. In particular, the concrete floor surface (H), as well as the connecting portion of the bottom surface (H) connected at right angles to the side (V) can be constructed simply and effectively.

The present invention described above is not limited to the described embodiments, and it is obvious to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the present invention. Therefore, such modifications or modifications will have to belong to the claims of the present invention.

11,12,13: Synthetic resin sheet 20: Primer layer
30: fiber sheet 31: fluidized bed
32: adhesive layer 33: release paper
40: top coating layer 50: metal plate material
60: anchor bolt 70: sealing layer
H: Concrete floor V: Concrete side

Claims (10)

In the method of waterproofing concrete,
Laying a plurality of synthetic resin sheets so that a portion of side surfaces adjacent to the bottom surface of the concrete are superimposed and stacked;
Applying a primer with a thickness of 0.5 to 2 mm with a polyurethane resin in which the weight ratio of isocyanate and polyol compound is mixed at 1:1 to 1:5 on the border of the adjacent laminated synthetic resin sheet;
The fluid layer formed in the longitudinal direction in the center of the back surface of the band-shaped fiber sheet having a predetermined width at the boundary of the synthetic resin sheet coated with the primer is aligned with the boundary of the synthetic resin sheet, and the longitudinal direction of both sides is interposed through the fluidized layer. Bonding an adhesive layer formed of each adjacent synthetic resin sheet; And,
Impregnating the fiber sheet with a polyurethane resin having a viscosity of 2,000 ~ 4,000CP; concrete waterproofing method comprising a. According to claim 1,
Concrete waterproofing method characterized in that the adhesive layer exposed by removing the release paper provided on the back surface of the fiber sheet is adhered to each of the adjacent synthetic resin sheets. In the method of waterproofing concrete,
Installing a bent metal plate along the connecting portion of the bottom and side of the concrete;
Laying a synthetic resin sheet to cover the metal plate on the concrete floor;
Applying a primer on the laid synthetic resin sheet;
Bonding the fiber sheet onto the synthetic resin sheet coated with the primer and on a metal plate installed on the concrete side; And,
Impregnating the fiber sheet with a synthetic resin; Concrete waterproofing method comprising a. According to claim 3,
Concrete filling method characterized in that it further comprises the step of filling the gap between the metal plate and the side of the silicon. According to claim 3,
The primer is a concrete waterproofing method characterized in that the weight ratio of the isocyanate and the polyol compound is applied in a thickness of 0.5 to 2 mm with a polyurethane resin mixed in a 1:1 to 1:5 ratio. The method of claim 5,
The fiber sheet is a polyurethane waterproofing method, and a concrete waterproofing method characterized in that the ultra high molecular weight polyethylene fiber is woven into a composite yarn made of a covering yarn wound around 400 to 800 twists around the examination. The method of claim 6,
The composite yarn is a concrete waterproofing method characterized in that the elongation is 100 to 180% and the tensile strength is 15g/de or more. The method of claim 7,
The thickness of the fiber sheet is a concrete waterproofing method, characterized in that from 120g / ㎡ to 180g / ㎡. The method of claim 6,
Concrete waterproofing method characterized by impregnating the fiber sheet with a polyurethane resin having a viscosity of 2,000 ~ 4,000CP. In the method of waterproofing concrete,
Installing a bent metal plate along the connecting portion of the bottom and side of the concrete;
Laying a plurality of synthetic resin sheets so that a portion of neighboring side surfaces overlap and overlap the metal plate on the floor surface of the concrete and the floor surface of the concrete;
Applying a primer to a boundary portion of the adjacent synthetic resin sheet overlapping and laminated with the synthetic resin sheet laid on a metal plate;
Bonding the fiber sheet to the synthetic resin sheet coated with the primer;
Impregnating the fiber sheet with synthetic resin; And,
Filling the gap in the gap between the metal plate and the side; concrete waterproofing method comprising a.

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