Waterproof sheet material

Abstract

To provide waterproof sheet materials that can be easily and efficiently installed while improving adhesion to concrete members.SOLUTION: Provided is a waterproof sheet material to be installed on a concrete member, having a base material consisting of a waterproof layer and a reinforcing layer bonded together, and having an adhesion layer for adhering the base material to the concrete member. Here, the waterproof layer has a first waterproof layer and a second waterproof layer, the base material is configured so that both sides of the reinforcing layer are sandwiched between the first and second waterproof layers, and the adhesion layer is provided on the opposite side of the first or second waterproof layer to which the reinforcement layer is joined.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a waterproof sheet material to be applied to a concrete member. [Background technology]

[0002] 2. Description of the Related Art Waterproofing methods that increase the waterproofing properties of concrete after hardening by applying a waterproof coating or forming a waterproof layer on the surface of poured concrete are widely used.

[0003] One example of a waterproofing method applied to concrete is a technique in which a resin-impregnated sheet is laid on top of the concrete and then liquid resin is sprayed onto it to form a waterproof layer made of fiber-reinforced plastic on the surface of the concrete (see, for example, Patent Document 1). In the waterproofing method of Patent Document 1, the resin-impregnated sheet is integrated with the resin to provide waterproofing, but because the resin is not sprayed directly onto the concrete, it is said that the waterproof layer can be applied regardless of the moisture content of the concrete.

[0004] There is also a technique in which a waterproof sheet is attached to the inside of a concrete formwork in advance, concrete is poured into the formwork, and the formwork is removed after the concrete has hardened, resulting in a concrete structure with a waterproof sheet adhered to the concrete surface (see, for example, Patent Document 2). The waterproofing method in Patent Document 2 is said to be able to protect the concrete immediately after it is poured, because the waterproof sheet comes into contact with the concrete without waiting for the concrete to dry. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 10-131310 [Patent Document 2] JP 2002-188287 A Summary of the Invention [Problem to be solved by the invention]

[0006] This type of waterproof sheet (material) is used over the long term in contact with concrete components, so it goes without saying that it must be waterproof and durable, but it must also be able to conform to the surface shape of the concrete component, adhere well to the concrete component, and be easy and efficient to install.

[0007] In this regard, the waterproofing method of Patent Document 1 sprays resin only onto the surface of the sheet (i.e., one side), so there is a risk that the resin does not penetrate the entire sheet and sufficient waterproofing cannot be obtained. In addition, if there is a difference in the amount of resin impregnated between the concrete contact side of the sheet and the resin sprayed side, the sheet may bend due to the difference in the state of the sheet after the resin hardens, and the adhesion of the sheet to the concrete may decrease. Furthermore, as described in paragraph 0001 of the specification of Patent Document 1, the waterproofing method of Patent Document 1 is intended to be carried out on site, and it is difficult to say that the construction is easy and efficient.

[0008] As described in paragraph 0017 of the specification of Patent Document 2, the waterproofing method requires that the adhesive strength between the concrete formwork and the waterproof sheet must be set to a certain level or higher in order to prevent the waterproof sheet from slipping or falling off when the concrete is poured, but must be set to be weaker than the adhesive strength between the concrete and the waterproof sheet so that the waterproof sheet does not remain on the formwork side when the formwork is removed. However, the adhesive strength between the concrete and the waterproof sheet varies depending on the concrete pouring conditions and the climate, and it is not always possible to obtain an appropriate adhesive strength. Therefore, there is a risk that the waterproof sheet will be displaced from the concrete surface when the formwork is removed, or that part of the waterproof sheet will break while still attached to the formwork. In addition, the waterproofing method of Patent Document 2 requires a lot of effort to attach the waterproof sheet to the inside of the formwork, and it is difficult to say that the construction is easy and efficient.

[0009] Thus, the waterproof sheets (materials) used in conventional waterproofing methods have room for improvement in terms of adhesion to concrete members and ease of application. The present invention has been made in consideration of the above problems, and aims to provide a waterproof sheet material that has excellent durability and strength while improving adhesion to concrete members, and can be applied easily and efficiently. [Means for solving the problem]

[0010] The characteristic configuration of the waterproof sheet material according to the present invention for solving the above problems is as follows: A waterproof sheet material to be applied to a concrete member, A base material is provided in which a waterproof layer and a reinforcing layer are joined together, The concrete member has an adhesion layer for adhering the base material to the concrete member.

[0011] According to the waterproof sheet material of this configuration, since it has an adhesion layer for adhering the substrate to the concrete member, the substrate formed by bonding the waterproof layer and the reinforcing layer firmly adheres to the concrete member, and the waterproofing ability inherent to the waterproof layer can enhance the waterproofing of the concrete member. Furthermore, since the adhesion layer is provided, the substrate does not come into direct contact with the concrete member, so the durability (lifespan) of the substrate is extended, and the substrate can also be made to conform well to the surface shape of the concrete member.

[0012] In the waterproof sheet material according to the present invention, The waterproof layer includes a first waterproof layer and a second waterproof layer, The base material is configured such that both sides of the reinforcing layer are sandwiched between the first waterproof layer and the second waterproof layer, The adhesion layer is preferably provided on the side of the first waterproof layer or the second waterproof layer opposite to the side to which the reinforcing layer is joined.

[0013] According to the waterproof sheet material of this configuration, the waterproof layer is divided into a first waterproof layer and a second waterproof layer, and the reinforcing layer is sandwiched between the two waterproof layers, so that the substrate has firmness and stiffness, improving the durability of the waterproof sheet material. In addition, since the adhesive layer is provided on the side opposite to the side where the reinforcing layer of the first waterproof layer or the second waterproof layer is joined, the waterproof sheet material can be easily applied to the concrete member by simply attaching the adhesive layer of the waterproof sheet material to the surface of the concrete member. In addition, such an attachment operation can be performed at a place other than the site if there is a small space, so that the efficiency of the application can be improved. Furthermore, when the adhesive layer is provided on the substrate, the second waterproof layer with which the adhesive layer is in direct contact is sacrificed, so that the adhesive layer functions to protect the reinforcing layer and the first waterproof layer, so that the strength of the reinforcing layer and the waterproofness of the first waterproof layer can be prevented from decreasing.

[0014] In the waterproof sheet material according to the present invention, The adhesion layer preferably includes a nonwoven fabric sheet.

[0015] According to the waterproof sheet material of the present configuration, if a nonwoven fabric sheet is used as the adhesion layer, when the adhesion layer is adhered to concrete, the concrete penetrates between the fibers that make up the nonwoven fabric sheet, thereby increasing the adhesion between the substrate and the concrete member, and as a result, the waterproofing of the concrete member provided by the waterproof layer can be further improved.

[0016] In the waterproof sheet material according to the present invention, The nonwoven fabric sheet is preferably configured to have a needle-punched single layer structure or a spunbond / needle-punched multi-layer structure.

[0017] According to the waterproof sheet material of this configuration, when the nonwoven fabric sheet is configured to have a needle-punched single layer structure or a spunbond / needle-punched multilayer structure, the adhesive layer has an appropriate amount of voids, thereby further enhancing the waterproofing of the concrete member provided by the waterproof layer.

[0018] In the waterproof sheet material according to the present invention, The adhesive layer is preferably made of at least one material selected from the group consisting of polyethylene terephthalate, nylon, polypropylene, polyethylene, vinylon, polyurethane, vulcanized rubber, silicone, rayon, and cotton.

[0019] According to the waterproof sheet material of this configuration, when the adhesion layer is made of at least one material selected from the group consisting of polyethylene terephthalate, nylon, polypropylene, polyethylene, vinylon, polyurethane, vulcanized rubber, silicone, rayon, and cotton, the adhesion layer has good affinity with concrete, thereby further improving the adhesion of the waterproof sheet material to the concrete member and the waterproofing of the concrete member provided by the waterproof layer.

[0020] In the waterproof sheet material according to the present invention, The base material is preferably configured so that the first waterproof layer and the second waterproof layer have different thicknesses.

[0021] According to the waterproof sheet material of this configuration, by configuring the base material so that the thickness of the first waterproof layer and the thickness of the second waterproof layer are different, it is possible to adjust the degree of waterproofing of the concrete member provided by the two waterproof layers. Also, by changing the thickness of the first waterproof layer and the thickness of the second waterproof layer, the position of the reinforcing layer sandwiched between the two waterproof layers can be changed from a position closer to the adhesive layer side to a position closer to the surface side, so that the flexibility (stiffness and stiffness) and durability of the base material can be adjusted, and the durability and conformability of the waterproof sheet material can be changed according to the surface shape of the concrete member. [Brief description of the drawings]

[0022] [Figure 1] FIG. 1 is a schematic cross-sectional view of a waterproof sheet material according to a first embodiment. [Diagram 2] FIG. 5 is a schematic cross-sectional view of a waterproof sheet material according to a second embodiment. [Diagram 3] FIG. 11 is a schematic cross-sectional view of a waterproof sheet material according to a third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] The waterproof sheet material of the present invention will be described with reference to the drawings. However, the configuration (layers) of the waterproof sheet material shown in each drawing have been appropriately exaggerated or simplified to facilitate explanation, and the size and scale relationships between the layers are not accurately reflected.

[0024] The waterproof sheet material of the present invention is applied to a concrete member before it is completely hardened, and is used to improve the waterproofness of the concrete member after hardening. The water pressure resistance required for the waterproof sheet material to exhibit sufficient waterproofness of the concrete member after hardening is 490 kPa or more. Concrete members to which the waterproof sheet material is applied include concrete structures such as dams, bridges, and waterways, concrete buildings such as buildings, apartment buildings, and reinforced concrete houses, and underground concrete structures such as underground water reservoirs, underground passages, and underground parking lots. Representative embodiments of the waterproof sheet material of the present invention will be described below.

[0025] First Embodiment [Overall configuration] FIG. 1 is a schematic cross-sectional view of a waterproof sheet material 101 according to a first embodiment of the present invention. The waterproof sheet material 101 includes a waterproof layer 11 that provides a waterproof function to the waterproof sheet material 101, and a reinforcing layer 12 that provides firmness and stiffness to the waterproof sheet material 101. The waterproof layer 11 and the reinforcing layer 12 are joined together to form a substrate 10. This joining can be performed by heat fusion or adhesion with an adhesive. In the first embodiment, the waterproof layer 11 is composed of two waterproof layers, a first waterproof layer 11a and a second waterproof layer 11b, and the first waterproof layer 11a and the second waterproof layer 11b are joined so as to sandwich the reinforcing layer 12 from both sides, forming a three-layer substrate 10 consisting of the first waterproof layer 11a, the reinforcing layer 12, and the second waterproof layer 11b in this order from the upper side (sheet surface side). Such a three-layer substrate 10 provides firmness and stiffness to the substrate 10, which contributes to improving the durability of the waterproof sheet material 101.

[0026] An adhesive layer 20 is provided on one end of the substrate 10 to adhere the substrate 10 to the concrete member A. By providing the adhesive layer 20, the substrate 10 adheres firmly to the concrete member A, and the waterproofing ability of the waterproof layer 11 (first waterproof layer 11a and second waterproof layer 11b) can enhance the waterproofing of the concrete member A. In addition, by providing the adhesive layer 20, the substrate 10 can be made to conform well to the surface shape of the concrete member A. In the first embodiment, the adhesive layer 20 is provided on the opposite side to the side where the reinforcing layer 12 of the second waterproof layer 11b is joined. With this configuration, the waterproof sheet material 101 can be easily applied to the concrete member A by simply attaching the adhesive layer 20 of the waterproof sheet material 101 to the surface (before hardening) of the concrete member A. In addition, the application work of the waterproof sheet material 101 having the adhesive layer 20 to the concrete member A can be performed at a place other than the site if there is a small space, so that the efficiency of the application can be improved. Furthermore, when the adhesive layer 20 is provided on the substrate 10, the adhesive layer 20 functions to protect the reinforcing layer 12 and the first waterproof layer 11a at the expense of the second waterproof layer 11b with which it is in direct contact, thereby preventing a decrease in the strength of the reinforcing layer 12 and a decrease in the waterproofness of the first waterproof layer 11a. The adhesive layer 20 can be provided on the substrate 10 by fusion bonding through heating or adhesion with an adhesive.

[0027] The thickness of the waterproof sheet material 101 is set to 0.5 to 11.0 mm, preferably 1.0 to 2.5 mm. If the thickness of the waterproof sheet material 101 is less than 0.5 mm, there is a risk that the waterproofing of the concrete member A cannot be sufficiently improved. If the thickness of the waterproof sheet material 101 exceeds 11.0 mm, there is a risk that the conformability to the surface shape of the concrete member A will deteriorate, and further, the weight of the waterproof sheet material 101 will increase, resulting in a decrease in workability. The basis weight of the waterproof sheet material 101 is 400 to 1000 g / m 2 The weight of the waterproof sheet material 101 is set to 400 g / m 2 If the weight per unit area of ​​the waterproof sheet material 101 is less than 1000 g / m, there is a risk that the waterproofing of the concrete member A cannot be sufficiently improved. 2If it exceeds this value, the weight of the waterproof sheet material 101 increases, which may reduce workability. Each layer constituting the waterproof sheet material 101 will be described in detail below.

[0028] [Waterproof layer] Materials constituting the waterproof layer 11 include resins such as ethylene-vinyl acetate copolymer, vinyl chloride, polyethylene, polypropylene, chlorinated polyethylene, polyurethane, vulcanized rubber, and silicone, and these resins can be used alone or in combination. A preferred resin is ethylene-vinyl acetate copolymer, because it is flexible, has good conformability to uneven surfaces, and has elasticity, which is maintained even in a low-temperature environment. The form (structure) of one waterproof layer 11 (each of the first waterproof layer 11a and the second waterproof layer 11b) may be any of a single layer, a multi-layer, and a mixed layer, but a single layer is preferable from the viewpoint of maintaining good conformability to the surface shape of the concrete member A. In the first embodiment, the thicknesses of both the first waterproof layer 11a and the second waterproof layer 11b are preferably set to 0.1 to 0.4 mm, and the thickness of the waterproof layer 11 is set to 0.2 to 0.6 mm. If the thickness of the waterproof layer 11 is less than 0.2 mm, there is a risk that the waterproofness of the concrete member A cannot be sufficiently improved. If the thickness of the waterproof layer 11 exceeds 0.6 mm, the thickness of the waterproof sheet material 101 itself will also increase, which may result in poor conformability to the surface shape of the concrete member A.

[0029] [Reinforcement layer] Examples of materials constituting the reinforcing layer 12 include resins such as polyethylene terephthalate, nylon, polyethylene, polypropylene, and vinylon, and these resins can be used alone or in combination. A preferred resin is polyethylene terephthalate from the viewpoint of versatility (easy availability and low cost). The form (structure) of the reinforcing layer 12 may be any of woven fabric, knitted fabric, and nonwoven fabric, but from the viewpoint of strengthening the bond with the waterproof layer 11 (first waterproof layer 11a and second waterproof layer 11b), a sheet-like woven fabric is preferred. In the first embodiment, the thickness of the reinforcing layer 12 is set to 0.1 to 5.0 mm, preferably 0.2 to 1.0 mm. If the thickness of the reinforcing layer 12 is less than 0.1 mm, the waterproof sheet material 101 may not be able to exhibit sufficient stiffness and stiffness. If the thickness of the reinforcing layer 12 exceeds 5.0 mm, the waterproof sheet material 101 will become too hard, resulting in poor conformability to the surface shape of the concrete member A, and the weight of the waterproof sheet material 101 will increase, which may reduce workability.

[0030] [Adhesion layer] Examples of materials constituting the adhesion layer 20 include polyethylene terephthalate, nylon, polypropylene, polyethylene, vinylon, polyurethane, vulcanized rubber, silicone, rayon, and cotton, and these materials can be used alone or in combination. A preferred material is polypropylene from the viewpoints of alkali resistance and versatility (easy availability and low cost). When the adhesion layer 20 is made of these materials, the adhesion layer 20 has a good affinity with concrete, so that the adhesion of the waterproof sheet material 101 to the concrete member A and the waterproofness of the concrete member A provided by the waterproof layer 11 can be further improved. In addition, if the adhesion layer 20 is given hydrophilicity, the affinity of the adhesion layer 20 with concrete can be further improved, and the adhesion of the waterproof sheet material 101 and the waterproofness of the concrete member A can be further improved. Examples of methods for imparting hydrophilicity to the adhesion layer 20 include a method of using highly water-absorbent fibers such as rayon and cotton as fibers constituting the nonwoven fabric (in this case, from the viewpoint of alkali resistance, for example, composite fibers of polypropylene and rayon are preferable), and a method of imparting a water-absorbing agent (such as a surfactant) to a nonwoven fabric made of a material with poor water absorption such as polypropylene or polyethylene terephthalate by post-processing (such as impregnation treatment). The form (structure) of the adhesion layer 20 may be any of woven fabric, knitted fabric, and nonwoven fabric, but from the viewpoint of increasing adhesion by penetrating into the concrete member A, it is preferable to use a sheet-like nonwoven fabric. In addition, when a nonwoven fabric sheet is used as the adhesion layer 20, it may have a single-layer structure made of a single type of nonwoven fabric sheet, or a multi-layer structure in which multiple different types of nonwoven fabric sheets are layered. Examples of types of nonwoven fabric include spunbond, needle punch, spunlace, thermal bond, and meltblown. In particular, when the nonwoven fabric sheet is configured to have a needle-punched single layer structure or a spunbond / needle-punched multilayer structure, the adhesion layer 20 has appropriate voids, which can further improve the waterproofing of the concrete member A by the waterproof layer 11. In the first embodiment, a polypropylene spunbond nonwoven fabric sheet and a polypropylene needle-punched nonwoven fabric sheet are overlapped to form the adhesion layer 20 having a multilayer structure.In the first embodiment, the thickness of the adhesion layer 20 is set to 0.1 to 5.0 mm. If the thickness of the adhesion layer 20 is less than 0.1 mm, the adhesion layer 20 cannot sufficiently penetrate into the concrete member A, and there is a risk of reduced adhesion. If the thickness of the adhesion layer 20 exceeds 5.0 mm, the distance between the waterproof layer 11 and the concrete member A becomes large, making it impossible to improve the waterproofing of the concrete member A, and furthermore, the weight of the waterproof sheet material 101 increases, and there is a risk of reduced workability.

[0031] Second Embodiment 2 is a schematic cross-sectional view of a waterproof sheet material 102 according to a second embodiment of the present invention. In the waterproof sheet material 102 according to the second embodiment, components having the same or similar configuration as the waterproof sheet material 101 according to the first embodiment are simply given the same reference numerals in the figure, and detailed description thereof will be omitted.

[0032] The waterproof sheet material 102 according to the second embodiment, like the waterproof sheet material 101 according to the first embodiment, has a three-layered base material 10 consisting of, in order from the top (sheet surface side), a first waterproof layer 11a, a reinforcing layer 12, and a second waterproof layer 11b, and an adhesive layer 20 is provided on the side of the second waterproof layer 11b opposite to the side to which the reinforcing layer 12 is joined. However, the thickness and basis weight of the waterproof sheet material 102 are different from those of the first embodiment, and the thickness of the waterproof sheet material 102 is set to 0.7 to 5.8 mm, preferably 0.8 to 1.0 mm, and the basis weight of the waterproof sheet material 101 is set to 700 to 800 g / m 2 The thickness of each layer is different from that of the first embodiment. In the second embodiment, the thicknesses of the first waterproof layer 11a and the second waterproof layer 11b are both preferably set to 0.1 to 0.2 mm, and the thickness of the waterproof layer 11 is set to 0.2 to 0.3 mm. The thickness of the reinforcing layer 12 is set to 0.2 to 5.0 mm. The thickness of the adhesion layer 20 is set to 0.1 to 0.2 mm. In addition, a needle-punched nonwoven fabric sheet made of polypropylene having a single-layer structure is used as the adhesion layer 20.

[0033] The waterproof sheet material 102 in the second embodiment is firm and has high strength, and furthermore, it is easy to attach to the concrete member A, thereby making construction more efficient.

[0034] <Third embodiment> 3 is a schematic cross-sectional view of a waterproof sheet material 103 according to a third embodiment of the present invention. In the waterproof sheet material 103 according to the third embodiment, components having the same or similar configuration as the waterproof sheet material 101 according to the first embodiment or the waterproof sheet material 102 according to the second embodiment are simply given the same reference numerals in the figure, and detailed description thereof will be omitted.

[0035] The waterproof sheet material 103 according to the third embodiment differs from the waterproof sheet material 101 according to the first embodiment or the waterproof sheet material 102 according to the second embodiment in that it has a two-layered substrate 10 consisting of a waterproof layer 11 and a reinforcing layer 12 in that order from the upper side (sheet surface side), and an adhesive layer 20 is provided directly on the side of the reinforcing layer 12 opposite to the side to which the waterproof layer 11 is joined. The thickness of the waterproof sheet material 103 is set to 0.5 to 10.5 mm, preferably 0.8 to 1.2 mm, and the basis weight of the waterproof sheet material 101 is set to 950 to 1050 g / m 2 The thickness of the waterproof layer 11 is set to 0.2 to 0.5 mm. The thickness of the reinforcing layer 12 is set to 0.2 to 5.0 mm. The thickness of the adhesive layer 20 is set to 0.1 to 5.0 mm. In addition, a multi-layer structure in which a spunbond nonwoven fabric sheet made of polypropylene and a needle-punched nonwoven fabric sheet made of polypropylene are laminated is adopted as the adhesive layer 20.

[0036] The waterproof sheet material 103 according to the third embodiment is flexible and has good conformability to the surface shape of the concrete member A, and further has high adhesion to the concrete member A.

[0037] <Another embodiment> The waterproof sheet material of the present invention may be obtained by partially modifying the configuration of the waterproof sheet materials 101, 102, and 103 according to the first to third embodiments. Some of such modified examples will be described as other embodiments.

[0038] [Another embodiment 1] In the waterproof sheet material 101 according to the first embodiment or the waterproof sheet material 102 according to the second embodiment, the first waterproof layer 11a and the second waterproof layer 11b are set to the same thickness, but it is also possible to make the thickness of the first waterproof layer 11a and the thickness of the second waterproof layer 11b different. In this case, the degree of waterproofing of the concrete member A provided by the two waterproof layers 11a and 11b can be adjusted. In addition, by changing the thickness of the first waterproof layer 11a and the thickness of the second waterproof layer 11b, the position of the reinforcing layer 12 sandwiched between the two waterproof layers 11a and 11b can be changed from a position closer to the adhesive layer 20 side to a position closer to the surface side, so that the flexibility (rigidity and stiffness) and durability of the base material 10 can be adjusted, and the degree of conformity of the waterproof sheet materials 101 and 102 according to the surface shape of the concrete member A can also be changed.

[0039] [Alternative embodiment 2] In the waterproof sheet material 103 according to the third embodiment, the adhesive layer 20 is provided directly on the side of the reinforcing layer 12 opposite to the side to which the waterproof layer 11 is bonded, but the reinforcing layer 12 and the adhesive layer 20 can be configured as an integral body. The form (structure) of the reinforcing layer 12 and the adhesive layer 20 may be any of woven fabric, knitted fabric, and nonwoven fabric. For example, if the reinforcing layer 12 and the adhesive layer 20 are both woven fabric sheets or nonwoven fabric sheets, the reinforcing layer 12 and the adhesive layer 20 can be configured as a laminate (not shown) of multi-layered woven fabric sheets or nonwoven fabric sheets. When this laminate is bonded to the waterproof layer 11, the layer in contact with the waterproof layer 11 of the laminate functions as the reinforcing layer 12, and the other layers function as the adhesive layer 20.

[0040] [Alternative embodiment 3] In the waterproof sheet material 101 according to the first embodiment, the waterproof sheet material 102 according to the second embodiment, and the waterproof sheet material 103 according to the third embodiment described above, the adhesion layer 20 is provided only on one side of the substrate 10, but it is also possible to provide it on both sides of the substrate 10. In this case, since the adhesion layer 20 of the waterproof sheet materials 101, 102, 103 is exposed on both sides, by sandwiching the waterproof sheet materials 101, 102, 103 between two concrete members A, A, it is possible to simultaneously improve the waterproofing of the two concrete members A, A. [Industrial Applicability]

[0041] The waterproof sheet material of the present invention can be used to enhance the waterproofing of concrete components, for example, concrete structures such as dams, bridges, and waterways, concrete buildings such as buildings, apartment buildings, and reinforced concrete houses, and underground concrete structures such as underground reservoirs, underground passages, and underground parking lots. [Explanation of symbols]

[0042] 10 Base material 11 Waterproof layer 11a First waterproof layer 11b Second waterproof layer 12 Reinforcement layer 20 Adhesion layer 101, 102, 103 Waterproof sheet material A Concrete material

Claims

1. A waterproof sheet material to be applied to a concrete member before hardening, A base material is provided in which a waterproof layer and a reinforcing layer are joined together, An adhesion layer for adhering the base material to the concrete member, The adhesive layer is a waterproof sheet material including a nonwoven fabric sheet using at least one type of fiber selected from the group consisting of rayon and cotton.

2. The waterproof layer includes a first waterproof layer and a second waterproof layer, The base material is configured such that both sides of the reinforcing layer are sandwiched between the first waterproof layer and the second waterproof layer, The waterproof sheet material according to claim 1 , wherein the adhesion layer is provided on the side of the first waterproof layer or the second waterproof layer opposite to the side to which the reinforcing layer is joined.

3. 3. The waterproof sheet material according to claim 1 or 2, wherein the nonwoven fabric sheet is configured to have a needle-punched single layer structure or a spunbond / needle-punched multi-layer structure.

4. The waterproof sheet material according to claim 2 , wherein the base material is configured so that the first waterproof layer and the second waterproof layer have different thicknesses.

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