JP2014141830A - Intermediate sheet, underlayer buffer sheet, and coated film waterproof construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coated film waterproof construction method that suppresses thermal expansion of a coated film and that smooths a surface brought into contact with the coated film.SOLUTION: An intermediate sheet 10 for being laid between a substrate and a coated film in a coated film waterproof construction method includes: a base material 12 that has a top surface 12a and an undersurface 12b on the other side of the top surface; a reinforcement material 14 that is provided on the undersurface of the base material and that reinforces the base material; and a contact layer 15 that is provided on the top surface of the base material and that has a coated surface 15a of the coated film.

Description

  The present invention relates to an underlay cushion sheet laid between a base and a paint film in a paint film waterproofing method, an intermediate sheet used for the undercoat cushion sheet, and a paint film waterproofing method using them.

  The waterproof coating method, which is one of the waterproofing methods for roofs, is a method for forming a waterproof coating film by applying a coating material on the base frame or holding concrete. Compared to the molecular sheet waterproofing method, there is an advantage that a waterproof layer can be easily formed even in a complicated construction site shape.

  The underlayer cushion sheet in the waterproof coating method is also called an underlayer cushioning material or a breathable cushion sheet, and generally has a surface layer that directly adheres to the coating material, and a buffer layer that softens external impact and movement. It is composed of As the buffer layer, a synthetic resin-based sheet is used, and an acrylic adhesive material or an asphalt-based adhesive material having an adhesive function may be used. Moreover, when a nonwoven fabric is used for the surface layer, the surface layer may also serve as a buffer layer. The ventilation cushioning sheet is provided with an air passage between the foundation and the buffer sheet by interspersed with adhesive materials that adhere to the foundation.

Conventional underlay sheets generally include the following types. 1) A type in which a nonwoven fabric is affixed with an adhesive, 2) A type in which a perforated nonwoven fabric is affixed with an adhesive, a type in which a sealing agent is applied to the whole perforated nonwoven fabric, 3) A type in which a polymer sheet with a back groove is affixed with an adhesive, 4) A type in which the separator laminated on the adhesive material coated on the back surface of the polymer sheet is applied while peeling. When laying an underlay cushion sheet using such a non-woven fabric or a perforated nonwoven fabric, the non-woven fabric of the underlay cushion sheet is covered with wind, and it may be difficult to lay it efficiently and straight. In addition, when it rains during construction, rainwater penetrates into the nonwoven fabric. Therefore, it is necessary to wait for the water to dry from the nonwoven fabric even after raining, and the construction may not be resumed immediately. In addition, when a conventional underlay cushion sheet is used, swelling may occur due to the movement of the base or the thermal expansion of the coating material, resulting in a poor finish.

  An example of a mechanism that causes blistering will be described with reference to FIG. FIG. 8 is a diagram illustrating a mechanism in which joint swelling occurs in the joint part of the base. As shown in FIG. 8, joint portions 132 are formed between the pressing concretes 130 a and 130 b that are the foundations. When the outside air temperature rises, the holding concretes 130a and 130b expand and deform in the directions of arrows A and B in FIG. Therefore, the filling material 134 in the joint portion 132, for example, the backup material or the sealing material swells upward (in the direction of arrow C in FIG. 8). Thereby, the underlay cushion sheet 100 is pushed up, peeled off from the holding concrete 130a, 130b, and swells. On the other hand, the coating film 140 made of the urethane coating film waterproof material is thermally expanded as the outside air temperature rises, and is expanded together with the underlay cushion sheet 100 due to the expansion force. Since the thermal expansion of the coating film 140 promotes swelling, it has been desired to suppress the thermal expansion of the coating film 140 as much as possible.

  Another example of a mechanism that causes blistering will be described. When pasting the cushioning sheet on the joint with a step, if the flexibility of the cushioning sheet is low, the cushioning sheet cannot follow the stepped part of the joint, and the adhesive on the lower surface of the cushioning sheet does not touch the pressing concrete base. An unbonded part may be formed. Moisture staying under the presser concrete base evaporates as the temperature rises, and diffuses through the joints. In some cases, the sheet was pushed up and swollen.

  Therefore, there is a demand for an underlay cushion sheet that adheres to the base following the level difference of the joint portion of the holding concrete and does not generate an unbonded portion.

  Patent Document 1 discloses an underlay sheet in which a reinforcing layer is laminated on the upper surface of a base material.

  The underlay cushion sheet shown in Patent Document 1 has a reinforcing layer made of glass mesh or the like laminated on the upper surface of a base material, thereby suppressing thermal expansion of the coating film due to the urethane coating film waterproofing material. However, since the underlay cushion sheet shown in Patent Document 1 has unevenness due to the reinforcing layer on the surface in contact with the urethane coating waterproof material (coating film), when the urethane coating waterproof material is applied, The pinhole phenomenon (a phenomenon in which a small hole is formed in the coating film by the air remaining in the gap between the irregularities) may occur due to the irregularities. Therefore, it is desired to smooth the surface on which the urethane coating film waterproof material is applied.

JP 2011-94454 A

  In the waterproof coating method, it is required that the thermal expansion of the coating film be suppressed and that the coating surface in contact with the coating film be smooth.

  The invention according to claim 1 is an intermediate sheet laid between a base and a coating film by a coating film waterproofing method, the substrate having an upper surface and a lower surface opposite to the upper surface, and the substrate An intermediate sheet is provided, comprising: a reinforcing material that is provided on the lower surface of the substrate and that reinforces the substrate; and a contact layer that is provided on the upper surface of the substrate and has a coating surface.

  The invention according to claim 2 provides the intermediate sheet according to claim 1, wherein the reinforcing material is made of organic or inorganic fibers or glass mesh.

  Invention of Claim 3 provides the intermediate sheet provided with the outer layer which coat | covers the said reinforcing material in the intermediate sheet of Claim 1 or 2.

  The invention according to claim 4 provides the intermediate sheet according to any one of claims 1 to 3, further comprising an adhesive layer on the lower surface for bonding the reinforcing material to the base material. To do.

  The invention according to claim 5 comprises: the intermediate sheet according to any one of claims 1 to 4; and an adhesive layer having elasticity provided on a surface of the intermediate sheet opposite to the contact layer. An underlay cushion sheet is provided.

  The invention according to claim 6 provides the underlay cushion sheet according to claim 5, further comprising a release paper provided on the surface of the adhesive layer on the side opposite to the intermediate sheet.

  Invention of Claim 7 is a coating-film waterproofing method using the underlining buffer sheet of Claim 5 or 6, Comprising: The said underlining buffer sheet is affixed on the foundation | substrate with the said adhesion layer, A coating film is applied to the said coating surface. A coating waterproofing method is provided.

  The invention according to claim 8 is a coating film waterproofing method using the intermediate sheet according to any one of claims 1 to 4, wherein a surface of the intermediate sheet opposite to the coating surface is bonded. Provided is a coating film waterproofing method in which a coating film is formed on the coated surface by being attached to a base with an agent.

  Invention of Claim 9 is a coating-film waterproofing method using the intermediate sheet as described in any one of Claim 1 to 4, Comprising: The surface on the opposite side to the said coating surface of the said intermediate sheet is used as a foundation | substrate. A coating film waterproofing method is provided in which the intermediate sheet is mounted on a base using screws and a coating film is formed on the coating surface.

  The intermediate sheet according to the present invention suppresses the thermal expansion of the base material by the reinforcing material reinforcing the base material. Therefore, the thermal expansion of the coating film that adheres to the substrate via the contact layer can be suppressed. As a result, it is possible to prevent swelling and lifting due to thermal expansion of the coating film. That is, the underlayer cushioning sheet using the intermediate sheet of the present invention makes it possible to finish the roof surface smoothly and cleanly regardless of the displacement of the casing and the thermal expansion of the coating film. In particular, it is possible to eliminate blisters occurring at the joints in the renovation work of the holding concrete base. In addition, since the reinforcing material is provided on the lower surface of the base material, the shape of the reinforcing material does not affect the coating film, and the coated surface is smooth. Hard to occur.

FIG. 1A is a cross-sectional view of an intermediate sheet according to an embodiment of the present invention, and FIG. 1B is a cross-sectional view of an underlay cushion sheet according to an embodiment of the present invention. It is a figure which shows the network structure of the glass mesh of a reinforcing material, FIG.2 (a) is a figure which shows the case where a glass fiber is arranged in a triaxial direction, FIG.2 (b) is the case where a glass fiber is arranged in a biaxial direction FIG. It is a perspective view which shows the lower surface of the underlay cushion sheet | seat shown in FIG.1 (b). FIG. 4 is a cross-sectional view showing a state in which an intermediate sheet or an underlay buffer sheet is laid between the base and the coating material, and FIG. 4A shows a state in which the undercoat buffer sheet is attached to the base with an adhesive; FIG. 4B is a diagram illustrating a state in which the intermediate sheet is fixed to the base with screws. FIG. 5A is a cross-sectional view showing another example of the intermediate sheet, and FIG. 5B is a cross-sectional view showing another example of the underlay cushion sheet. FIG. 6A is a cross-sectional view showing another example of the intermediate sheet, and FIG. 6B is a cross-sectional view showing another example of the underlay cushion sheet. Fig.7 (a) is a figure which shows the method of measuring the followable | trackability of an underlining buffer sheet, FIG.7 (b) is a figure which shows the measuring method of the softness | flexibility of an underlaying buffer sheet. It is a figure which shows the mechanism in which a joint swelling occurs in a joint part.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of an intermediate sheet and an underlay cushion sheet according to the present invention and a waterproof coating method using the same will be described with reference to the accompanying drawings. In the following embodiments, the same or similar components are denoted by common reference numerals, and the scale of these drawings is appropriately changed for easy understanding. However, it should be noted that the technical scope of the present invention is not limited to the embodiments, but extends to the invention described in the claims and equivalents thereof.

  The configuration of the intermediate sheet according to the present embodiment will be described. In the waterproof coating method, the intermediate sheet 10 is a sheet-like material laid between the base and the coating film in order to form a waterproof coating film by applying a coating material such as a urethane coating waterproof material. It is a member. As shown in FIG. 1A, the intermediate sheet 10 is provided on the base 12 having an upper surface 12a and a lower surface 12b opposite to the upper surface 12a, and the lower surface 12b of the base 12 to reinforce the base 12. And a contact layer 15 having good adhesion to the coating material, provided on the upper surface 12a of the substrate 12, and having a coating surface 15a of the coating film. Further, the intermediate sheet 10 includes an adhesive layer 16 that adheres the reinforcing material 14 to the base material 12 on the lower surface 12 b of the base material 12. Moreover, the protective layer 18 (an example of an outer layer) which covers the reinforcing material 14 is provided. And the intermediate sheet 10 of this embodiment has the base 12, the adhesive layer 16, and the protective layer 18 formed with a predetermined thickness for the purpose of having the flexibility to follow the level difference of the joint portion of the pressing concrete. Yes.

  The base material 12 of this embodiment is formed of a synthetic resin film made of a polyester film having a thickness of 12 μm. Examples of the synthetic resin film other than the polyester film include polypropylene, nylon, an ethylene-vinyl alcohol copolymer resin film, and a polyurethane film. The upper surface 12 a and the lower surface 12 b of the base material 12 may be subjected to corona discharge treatment in order to improve the adhesion with the reinforcing material 14 and the contact layer 15. The thickness of the substrate 12 is not particularly limited, but is suitably 5 to 100 μm from the viewpoint of strength and economy, more preferably 10 to 50 μm, and even more preferably about 12 μm. . When the base material 12 is formed with such a thickness, the intermediate sheet 10 has an appropriate flexibility, so that it becomes easy to become familiar with an uneven base.

  In the present embodiment, a glass mesh made of a plurality of glass fibers is used as the reinforcing material 14. Since the linear expansion coefficient of the glass fiber is very small and the strength is high, if the glass fiber is bonded to the base material 12, the elongation of the base material 12 with respect to the force along the longitudinal direction of the glass fiber can be suppressed. The strength of can be improved.

  The glass mesh will be described with reference to FIG. 2A and 2B are plan views of the intermediate sheet 10 as viewed from below. The glass mesh is a mesh-structured sheet formed by arranging a plurality of glass fibers 17 in a predetermined direction and knitting them into a mesh shape. There are two-axis, three-axis, and four-axis types depending on the direction in which the glass fibers are arranged. The intermediate sheet 10 of the present embodiment employs a triaxial glass mesh. As shown in FIG. 2A, the triaxial glass mesh is obtained by arranging glass fibers in a triaxial direction, that is, a longitudinal direction and a diagonal direction with respect to the longitudinal direction. The glass mesh of this embodiment arranges the fiber bundle 14a which consists of the glass fiber 17 of 2 yarns in parallel at equal intervals along the vertical direction (E direction of a figure), and also is diagonally (F1 direction of a figure, F2) The fiber bundles 14b and 14c made of three glass fibers are arranged in parallel at equal intervals along the direction). The size of the lattice formed by the bundle of glass fibers of the present embodiment, that is, the length D of a triangular piece is about 1 cm. The size of the lattice is not limited to 1 cm, and may be 0.5 cm to 3 cm. From the viewpoint of the reinforcing effect and cost, it is desirable that the thickness is 0.7 to 1.2 cm. In the illustrated embodiment, the glass fiber bundle 14b extending in the F1 direction is disposed at an angle of 60 degrees with respect to the glass fiber bundle 14a extending in the longitudinal direction (angle α), and the glass fiber bundle 14c extending in the F2 direction is disposed with respect to the fiber bundle 14a. Therefore, the grid has a substantially equilateral triangle shape (angle β). The lattice shape is not limited to this, and may be another triangle, for example, an isosceles triangle. Moreover, as shown in FIG.3 (b), you may arrange the bundle | flux of glass fiber in a biaxial direction, ie, the vertical direction and a horizontal direction.

  The density and thickness of each glass fiber are not particularly limited, but the glass fiber is composed of a single yarn or a plurality of yarns, and those having a thickness of 100 to 8000 denier and the number of filaments of 1 to 2000 / yarn are cost and It is preferable from the viewpoint of strength. In the present embodiment, the glass fiber bundle 14a arranged in the longitudinal direction (E direction) is composed of two yarns, has a thickness of 2430 denier, the number of filaments of 1600/2 yarns, and is arranged in an oblique direction (F1 direction, F2 direction). The glass fiber bundles 14b and 14c are made of three yarns each having a thickness of 3645 denier and a filament number of 2400/3 yarns.

  In addition, when the glass mesh is biaxial as shown in FIG. 2B, each glass fiber bundle is composed of a single yarn or a plurality of yarns, the density is 2 to 16 yarns / 25 mm, the thickness is 100 to 8000 denier, the number of filaments Those in the range of 1 to 2000 yarns / yarn are preferable from the viewpoint of cost and dimensional stability.

  The reinforcing material 14 is bonded to the base material 12 via the adhesive layer 16. Specifically, the synthetic resin melted as the adhesive layer 16 is applied to the lower surface 12b of the base material 12, and the glass mesh of the reinforcing material 14 is disposed on the synthetic resin being melted. The substrate 12 is fixed. In this embodiment, in order to increase the flexibility of the intermediate sheet 10, the flexible polyethylene is used after the reinforcing material 14 is bonded as the synthetic resin of the adhesive layer 16. The adhesive layer 16 is not limited to polyethylene and may be formed of other synthetic resins such as polyester and polypropylene. The thickness of the contact layer 16 of the present embodiment is not particularly limited, but is suitably 5 to 100 μm, more preferably 10 to 50 μm, even more preferably from the viewpoint of adhesiveness and economy. Is about 30 μm. By forming the adhesive layer 16 with such a thickness, the intermediate sheet 10 has an appropriate flexibility, and can be easily adapted to an uneven base.

The contact layer 15 of this embodiment is formed by applying a paint. Since it adheres directly to the coating film, it is desirable that the material has good adhesion to the coating film. In this embodiment, in order to form a coating film, a urethane coating film waterproof material is applied to the coating surface 15a. Therefore, an acrylic urethane resin-based paint having good adhesion to the urethane coating film waterproof material is used as the contact layer 15. ing. The contact layer 15 is not limited to an acrylic urethane resin-based paint, but a paint having good adhesion according to the material of the coating material, for example, an acrylic resin-based, urethane resin-based, epoxy resin-based, vinyl resin-based, alkyd resin-based The paint can be selected and used. In addition, it is good to select the coating material of the contact layer 15 which has favorable adhesiveness with a coating-film material, even if it exposes outdoors during the period until a coating-film material is apply | coated. When applying a coating of an acrylic urethane resin as a contact layer 15, the coating amount (dry weight) may lesser in consideration of the flexibility of the intermediate sheet 10 is preferably set at 1 to 50 g / m ^2, 2 10 to 10 g / m ² is more preferable.

  In the intermediate sheet 10 of the present embodiment, a reinforcing material 14 made of a glass mesh is provided on the lower surface 12 b of the base 12 to form irregularities. On the other hand, only the contact layer 15 is applied to the upper surface 12a, and the unevenness caused by the reinforcing material 14 is not directly affected, and is formed on a smooth surface. The pinhole phenomenon is unlikely to occur in the coating film. Moreover, since the upper surface 12a of the base material 12 is smooth, even when it rains before the coating material is applied after the intermediate sheet 10 is laid on the base, it adheres to the contact layer 15 of the intermediate sheet 10 It is easy to wipe rainwater, and construction can be resumed immediately after wiping.

  The intermediate sheet 10 is a protective layer 18 that protects the reinforcing material from damage on the surface 14a of the reinforcing material 14 located on the opposite side of the base material 12, that is, the lower surface 14a of the reinforcing material 14, as an outer layer covering the reinforcing material 14. May be provided. Since the intermediate sheet 10 is provided with the reinforcing material 14 on the lower surface 12b of the base material 12, there is a possibility that the reinforcing material 14 contacts the base at the joint portion as it is, and the reinforcing material 14 by absorbing the base moisture. Strength reduction and damage, for example, glass fibers can be cut or worn. Moreover, when sticking the intermediate sheet 10 to a base | substrate using an adhesive material, glass fiber may be damaged by an adhesive material. Therefore, a protective layer 18 for protecting the reinforcing material 14 from damage is provided, and the reinforcing material 14 is not directly in contact with the base or the adhesive layer 22 so that the performance of the reinforcing material is reduced due to the glass fiber damage or the strength reduction due to water absorption of the base water. Prevents the decline. When there is little possibility of damage due to the base or the adhesive layer 22, the protective layer 18 may not be provided.

  The protective layer 18 is formed from a synthetic resin, and polyethylene is used in this embodiment. The protective layer 18 is not limited to polyethylene, and may be formed of other synthetic resins such as polyester and polypropylene. The thickness of the protective layer 18 of the present embodiment is not particularly limited, but is suitably 5 to 100 μm, more preferably 10 to 70 μm, even more preferably from the viewpoint of adhesiveness and economy. Is about 30 μm. By forming the protective layer 18 with such a thickness, the intermediate sheet 10 has an appropriate flexibility, and is easily adapted to an uneven base.

  Next, the underlay cushion sheet 20 using the intermediate sheet 10 of the present embodiment will be described. As shown in FIG. 1B, the underlay cushion sheet 20 is formed by providing an adhesive layer 22 on the lower surface of the intermediate sheet 10 by partially interspersing an adhesive material having elasticity. In the present embodiment, an asphalt adhesive material obtained by adding a petroleum-based tackifier or the like to a synthetic rubber is used as an adhesive material having elasticity so that the adhesive layer 22 also serves as a buffer material for the underlay cushion sheet 20. . This asphalt-based pressure-sensitive adhesive material has good water-resistant adhesion and is suitable for the use of the underlay cushion sheet 20. Other elastic adhesive materials that can be used for the underlay cushion sheet 20 include styrene / butadiene rubber, butyl rubber, and recycled rubber adhesives, chloroprene adhesives, acrylic adhesives, and nitrile adhesives. Materials.

  A release paper 24 (also referred to as a separator or a release film) may be further provided on the lower surface of the adhesive layer 22. The underlay buffer sheet 20 is transported from the factory to the construction site with the release paper 24 attached, and the release paper 24 is peeled off at the site and the underlayer buffer sheet 20 is attached to the ground. The adhesive material after the release paper is peeled off also exhibits the expected adhesive force at an early stage.

  By forming the adhesive layer 22 to be partly scattered on the lower surface of the intermediate sheet 10, a plurality of grooves are formed as shown in FIG. A ventilating path 23 (insulating portion) that communicates with each other is formed by sticking the underlay cushion sheet 20 formed with the grooves to a base 130 such as pressing concrete or urethane base. Therefore, water vapor generated from the base 130 can be discharged as needed, and inconveniences such as deformation and tearing of the waterproof layer due to the swelling phenomenon can be avoided. The underlay cushion sheet provided with such a ventilation path 23 is also referred to as a “vent cushion sheet”.

  A method for attaching the underlay cushion sheet 20 of the present embodiment will be described. The underlay cushion sheet 20 with the release paper 24 is transported to a construction site, and the release paper 24 is peeled off at the construction site, and is pasted on the base 130 on which the primer 120 is applied, as shown in FIG. This method is a so-called self-attachment method. The self-adhesion method enables high-speed and efficient construction, and the expected adhesive force is expressed early.

  There is also a method (so-called adhesive method) in which a special adhesive is applied to the base and the intermediate sheet 10 without the adhesive layer 22 is attached to the base. After the intermediate sheet is attached to the base with an adhesive, a urethane coating waterproof material is applied to form a waterproof coating 140.

  In addition, as shown in FIG. 4B, instead of the self-adhesion method or the adhesive method, the intermediate sheet 10 may be fixed and attached to the base 130 using screws 26. After the intermediate sheet 10 is screwed, a urethane coating film waterproof material is applied to form a waterproof coating film 140. The sticking method by screwing has an advantage that the base treatment is simple or unnecessary.

An example of the waterproof coating structure and the waterproof coating method when the underlayer cushion sheet 20 of the present embodiment is used will be described. As shown in FIG. 4A, the primer 120 is applied to the upper surface of the pressing concrete to be the base 130, and then the underlay cushion sheet 20 is attached while peeling the release paper 24. The underlay cushion sheet 20 is attached by abutment construction, and a dedicated joint tape is attached to the joint portion of the undercoat cushion sheet 20 (not shown). After affixing the underlay buffer sheet 20, a urethane coating film waterproofing material (3.5 kg / m ² ) is applied in two portions to form a waterproof coating 140. After the urethane coating waterproof material is cured, an acrylic urethane top coat 142 as a finishing material is applied and finished. In addition, after affixing the under buffer sheet 20, the super fast curing urethane may be sprayed with a dedicated coating apparatus.

  FIG. 5 is a view showing another example of the intermediate sheet 10 and the underlay cushion sheet 20 shown in FIG. 1, and the intermediate sheet 30 shown in FIG. 5 (a) is a surface of the protective layer located on the side opposite to the reinforcing material. A reinforcing layer 32 (an example of an outer layer) is further provided on the lower surface of the protective layer 18a. The reinforcing layer 32 is made of a synthetic resin film, and is formed by sticking the synthetic resin film to the protective layer 18. The synthetic resin film that is the reinforcing layer 32 shown in FIG. 5 is made of a polyester film. Examples of materials other than the polyester film include polypropylene, nylon, an ethylene-vinyl alcohol copolymer resin film, and a polyurethane film. By providing the reinforcing layer 32, for example, it is possible to resist a force such as an external movement other than the fiber direction of the glass fiber of the reinforcing material 14. The thickness of the reinforcing layer 32 is not particularly limited, but is suitably 5 to 100 μm from the viewpoint of strength and economy, more preferably 10 to 50 μm, and still more preferably about 9 μm. It is. When the reinforcing layer 32 is formed with such a thickness, the intermediate sheet 10 has an appropriate flexibility while reinforcing the intermediate sheet 10, so that it becomes easy to become familiar with uneven bases.

  FIG. 6 is a view showing still another example of the intermediate sheet 10 and the underlay cushion sheet 20 shown in FIG. The intermediate sheet 50 shown in FIG. 6A is different from the intermediate sheet 10 in FIG. 1 in that the adhesive layer 16 is not provided between the base material 12 and the reinforcing material 14. In the intermediate sheet 50 in FIG. 6, the protective layer 52 (an example of the outer layer) covers the reinforcing material 14, and the protective layer 52 adheres to the base material 12 through the gap between the glass fibers of the reinforcing material 14. Is fixed to the substrate 12. As such a protective layer 52, for example, an asphalt adhesive can be used. Further, the intermediate sheet 50 shown in FIG. 6 includes a reinforcing layer 54 (an example of an outer layer) on the surface of the protective layer 52 opposite to the reinforcing material 14, that is, on the lower surface of the protective layer 52. The reinforcing layer 54 is a synthetic resin film like the intermediate sheet 30 shown in FIG. A polypropylene film can be used as the synthetic resin film. Examples of materials other than the polypropylene film include polyester, nylon, ethylene-vinyl alcohol copolymer resin film, polyurethane film, and the like. By using an asphalt adhesive as the protective layer 52, it is possible to bond the reinforcing material 14 to the base material 12 and to form the protective layer 52 at a time. FIG. 6B shows an underlay cushion sheet 60 in which the adhesive layer 22 is provided on the intermediate sheet 50 shown in FIG.

  Inventors performed the experiment shown below in order to confirm the effect which suppresses the heat | fever linear expansion of the urethane coating-film waterproof material of the underlining buffer sheet by this embodiment.

In the experiment, five specimens having a length of 900 mm and a width of 200 mm were prepared. The five test specimens were (1) a coating film made only of a urethane waterproof coating material, (2) an underlay cushion sheet made of only a base material without a reinforcing layer, and (3) an undercoat shown in FIG. Buffer sheet, (4) Underlying buffer sheet shown in FIG. 5B (when a reinforcing layer is further provided on the underlaying buffer sheet in FIG. 1B) (5) Underlying buffer sheet shown in FIG. 6B (protection) This is a case where an asphalt adhesive is used as a layer and a reinforcing layer is further provided. In the experiment, urethane film waterproofing material (3.5 kg / m ² ) was applied to each specimen in a room at 20 ° C in two portions, and the length of each specimen was measured 24 hours after application. Subsequently, after being left in a room at 60 ° C. for 8 hours, the length of each specimen was measured again. As a result of the measurement, the amount of change and the expansion rate are shown in Table 1.

  As shown in Table 1, when only the coating film of (1) is used, the expansion coefficient of the coating film is 0.43%, which indicates that the coating film is thermally expanded. Even in the case of only the base material (2), the expansion coefficient is 0.13%, and the coating film is expanded to a slight degree. In the case of (3) to (5) underlay cushion sheets, the coefficient of thermal expansion is 0.06%, and the thermal expansion of the coating film is greatly suppressed compared to the cases of (1) and (2). I understand. Accordingly, any of the buffer cushion sheets using the intermediate sheet of the present invention has an effect of suppressing the thermal expansion of the coating film, and by laying between the base and the coating film, the swelling of the waterproof layer generated particularly in the joint portion And can prevent lifting.

  Moreover, in order to confirm the followability of the underlay cushion sheet | seat by this embodiment, inventors conducted the level | step-difference followability test by the method shown below. In the step follow-up test, it is assumed that an underlay cushion sheet is attached to the joint step portion of the presser concrete.

  In the step following test, as shown in FIG. 7A, two heat insulating materials (hard urethane foams) 201 and 202 formed in rectangular parallelepipeds having different heights are disposed to face each other, and a step portion 203 having a step H1 of 10 mm is disposed. Was performed. The test piece 80 of the underlay cushion sheet is attached to the upper surfaces 201a and 202a of the respective heat insulating materials via the step portions 203, and the length L of the unbonded portion 204 formed by the step portions 203 is measured from the step portions 203. Is done. The test piece 80 of the underlay cushion sheet is cut to a length of 500 mm and a width of 100 mm, and the size is unified. Then, the test body 80 is arranged so that the center portion of each test body is located at the stepped portion 203, and is pasted so that the longitudinal direction of each test body and the stepped portion 203 (corner of the heat insulating material 201) are orthogonal to each other. ing. The test body 80 is pasted by peeling the release paper from the test body 80 and pasting the test paper 80 on the heat insulating materials 201 and 202, and then 200 g on the test body 80 from the upper surface 201 a of the heat insulating material 202 to the upper surface 201 b of the heat insulating material 201. The load was rolled back and forth three times. Table 2 shows the results of measuring the length L of the unbonded portion of each specimen. In this test, (1) a buffer sheet in which a non-woven fabric is laminated on the upper surface of the base material (conventional underlayer buffer sheet 1), (2) the upper surface of the base material described in Patent Document 1 (3) Underlay cushion sheet 20 shown in FIG. 1 (b), (4) Undercoat cushion sheet shown in FIG. 5 (b) 40, (5) An underlay cushion sheet 60 shown in FIG. 6B was prepared.

  From the test results in Table 2, it can be seen that the underlaid cushion sheets 20, 40, 60 according to the present embodiment have a shorter length L of the unbonded portion than the conventional cushion sheets 1, 2. The reason why the followability is better than that of the conventional underlay buffer sheet 2 is that the thickness of the coating applied mainly to the upper surface of the base material can be made thinner. Since the conventional underlay cushion sheet 2 fixes the glass fiber with the paint, the paint cushion is required to some extent, but the underlay cushion sheet of this embodiment does not have the reinforcing layer glass fiber disposed on the upper surface of the base material. Therefore, the thickness of the paint can be reduced. Another factor is the use of synthetic resin polyethylene for adhesion between the substrate and the reinforcing layer. The underlay cushion sheet according to the present embodiment can secure a larger number of bonded portions by reducing the number of unbonded portions at the step portions of the joints. For this reason, it is possible to prevent swelling and lifting due to water vapor pressure from the joint portion.

  The followability to the joint step portion of the presser concrete depends on the flexibility of the underlay cushion sheet. Therefore, the inventors measured the flexibility of the underlayer cushioning sheet according to the present embodiment using a “loop steph tester” manufactured by Toyo Seiki Seisakusho. FIG. 7B is a diagram showing a measurement method using a “loop step tester”.

  The flexibility is measured by fixing both ends of the test piece 80 of the underlayer cushion sheet cut to a predetermined size (25 mm × 205 mm) to the mount 220 and pushing the indenter 222 at a constant speed (3.3 mm / s). The test was performed by measuring the flexibility when the test body 80 was bent. The load cell 224 presses the test body 80 with the indenter 222 until the compression distance H2 becomes 15 mm. Then, after the indenter 222 stops, the strength of the test body 80 in the direction of arrow K is measured, and the measurement is continued for 60 seconds to obtain the maximum strength (mN) during that time. The inner distance J1 when the test body 80 is fixed is 170 mm, and the outer distance J2 is 190 mm.

  Moreover, as a test body of an underlay cushion sheet, as with the step portion followability test, five test bodies, (1) a cushion sheet in which a nonwoven fabric is laminated on the upper surface of a base material (conventional underlayer cushion sheet 1), (2) patent Underlay buffer sheet (conventional underlayer buffer sheet 2) in which a reinforcing layer is laminated on the upper surface of the base material described in Document 1 and further applied with a paint, (3) Underlayer buffer sheet 20 shown in FIG. 4) An underlayer cushioning sheet 40 shown in FIG. 5B and (5) an underlayer cushioning sheet 60 shown in FIG. 6B were prepared.

  In addition, in this measurement, in order to remove the influence of the adhesive material being scattered and disposed, the adhesive material is disposed on the entire lower surface of the intermediate sheet in the test body. Moreover, the underlay cushion sheet | seat ((2)-(5) test body) which has a reinforcing material uses the triaxial glass mesh as a reinforcing material. Since the flexibility of the underlayer cushioning sheet having the reinforcing material is influenced by the fiber direction of the glass fiber, the specimen cut along the longitudinal direction where the two-fiber glass fiber is arranged and the three-fiber glass fiber are arranged. The test body cut along the oblique direction was prepared, and each flexibility was measured. Since the conventional underlay buffer sheet 1 does not depend on the direction since the nonwoven fabric is laminated, only the test specimen cut in the longitudinal direction is measured. Table 3 shows the measurement results.

  As can be seen from Table 3, the maximum strength of the test bodies (3) to (5) is lower than the maximum strength of the test bodies (1) and (2). It can be seen that it is more flexible compared to the sheet.

  In the above, the surface material of this embodiment, the underlay cushion sheet using the same, and the coating film waterproofing method have been described with reference to the drawings.

In this embodiment, a synthetic resin film is used as a base material, but a synthetic fiber nonwoven fabric may be used. The synthetic fiber nonwoven fabric is not particularly limited in both material and basis weight, but in consideration of workability, the material is preferably polyester and the basis weight is preferably 30 to 200 g / m ² . Moreover, in this embodiment, although the glass mesh which knit the glass fiber was used for the reinforcing material, you may use the nonwoven fabric by glass paper and an organic or inorganic fiber.

10, 30, 50 Intermediate sheet 12 Base material 14 Reinforcing material 15 Contact layer 16 Adhesive layer 18, 52 Protective layer 20, 40, 60 Underlying buffer sheet 22 Adhesive layer 23 Ventilation layer 24 Release paper 32, 54 Reinforcement layer 120 Primer 130 Base 140 paint film

Claims (9)

An intermediate sheet laid between the base and the coating film by the waterproof coating method,
A substrate having an upper surface and a lower surface opposite to the upper surface;
A reinforcing material provided on the lower surface of the base material to reinforce the base material;
A contact layer provided on the upper surface of the substrate and having a coating surface of the coating;
An intermediate sheet comprising:   The intermediate sheet according to claim 1, wherein the reinforcing material is made of organic or inorganic fibers or glass mesh.   Furthermore, the intermediate sheet of Claim 1 or 2 provided with the outer layer which coat | covers the said reinforcing material.   Furthermore, the intermediate sheet as described in any one of Claim 1 to 3 provided with the contact bonding layer which adhere | attaches the said reinforcing material on the said base material on the said lower surface.   An underlay cushion sheet comprising: the intermediate sheet according to any one of claims 1 to 4; and an adhesive layer having elasticity provided on a surface of the intermediate sheet opposite to the contact layer.   Furthermore, the underlay cushion sheet | seat of Claim 5 provided with the release paper provided in the surface of the said adhesion layer on the opposite side to the said intermediate sheet. A coating waterproofing method using the underlayer cushioning sheet according to claim 5 or 6,
A coating film waterproofing method in which the undercoat buffer sheet is attached to a base by the adhesive layer, and a coating film is formed on the coated surface. A coating waterproofing method using the intermediate sheet according to any one of claims 1 to 4,
A coating film waterproofing method in which a surface opposite to the coating surface of the intermediate sheet is attached to a base with an adhesive to form a coating film on the coating surface. A coating waterproofing method using the intermediate sheet according to any one of claims 1 to 4,
A coating film waterproofing method in which a surface of the intermediate sheet opposite to the coating surface is placed on a base, the intermediate sheet is fixed to the base using a screw, and a coating film is formed on the coating surface.

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