Floor structure

Abstract

To provide a floor structure capable of suppressing fracture of tiles and stones through enhanced rigidity and improving sound insulation performance when using the tiles and stones as finishing material.SOLUTION: A floor structure 1A is provided with: floor substrate plywood plates 34, 35 arranged above a floor slab; a floor reinforcement layer 36 formed by coating epoxy resin primer 36b in a state fiber reinforcement material 36f of either of glass fiber material, carbon fiber material, or aramid fiber material is installed, on an upper surface of the floor substrate plywood plates 34, 35; and finishing material 38 made of stones or tiles bonded on the floor reinforcement layer 36.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a floor structure in which a floor underlayment plywood and a floor reinforcing layer are provided above a floor slab, and then a floor finishing material is placed thereon. [Background technology]

[0002] In a building, a floor structure may be constructed on a floor slab. For example, Patent Document 1 describes a floor panel that is laid above a floor slab via support legs, and that is made up of a floor finishing material and a base plate that is provided so as to abut the underside of the floor finishing material, and that the base plate has a cushioning material sandwiched between a lower rigid plate located at the bottom layer and an upper rigid plate located at the top layer. In Patent Document 1, the floor finishing material is, for example, plywood.

[0003] In such a floor structure, tiles or stone may be used as a finishing material that forms the surface of the floor. In this regard, Patent Document 2 describes a configuration in which two sheets of staggered plywood are inserted between the particle board that serves as the base material and the stone at the top, the two sheets of staggered plywood are staggered together, and the upper staggered plywood and the stone are also staggered together, thereby increasing the rigidity of the floor. In this configuration, the stone as the finishing material is bonded to the upper staggered plywood. Patent Document 3 describes a floor panel in which the laminated materials of a base panel, a lining material, a soundproofing sheet, a lining material, and floor stones are laminated in this order from the bottom up. In this configuration, the base panel, the lining material made of plywood placed on the base panel, the lining material and the soundproofing sheet, and the soundproofing sheet and the lining material are each fixed with an adhesive. A layer of adhesive is formed on the lining material, and floor stones are pasted on top of this adhesive layer as a finishing material. The adhesive used to fix each laminated material of the floor panel is an epoxy adhesive.

[0004] In Patent Documents 2 and 3, the stone material used as the finishing material is bonded to the plywood. In this way, when tiles, stone material, etc. are used as finishing materials and attached to plywood made of wood, the plywood has a lower rigidity in the out-of-plane direction than concrete, so the finishing material bears a larger load acting from above than when the finishing material is attached to concrete. As a result, the finishing material cannot withstand the load and may crack. Furthermore, in the configurations of Patent Documents 2 and 3, the impact sound that can be generated when an object falls on the floor is transmitted from the tiles or stone directly to the plywood, which can lead to the sound being transmitted to the floor below. When tiles or stone are used as finishing materials, it is desirable to increase the rigidity of the tiles or stone to prevent them from cracking and improve sound insulation performance. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2001-159208 A [Patent Document 2] JP 2004-232314 A [Patent Document 3] JP 2003-97026 A Summary of the Invention [Problem to be solved by the invention]

[0006] The problem that the present invention aims to solve is to provide a floor structure that, when tiles or stone are used as finishing materials, can increase the rigidity to suppress cracking of the tiles or stone and improve sound insulation performance. [Means for solving the problem]

[0007] The inventors have come up with the present invention by noting that a floor structure comprising a floor finishing material made of stone or tile can be achieved by laying a fiber reinforcement material such as glass fiber, carbon fiber or aramid fiber above a floor underlay plywood, providing a floor reinforcement layer on top of which is coated with an epoxy resin-based primer, and then providing a floor finishing material made of stone or tile on top of the floor reinforcement layer, thereby increasing the out-of-plane rigidity of the floor structure including the finishing material and the floor underlay plywood, thereby making it possible to suppress cracking of the floor finishing material. In order to solve the above problems, the present invention employs the following means. That is, the floor structure of the present invention is characterized by comprising a floor underlay plywood provided above a floor slab, a floor reinforcing layer formed by laying a fiber reinforcing material of any one of glass fiber material, carbon fiber material, and aramid fiber material on the upper surface of the floor underlay plywood and applying an epoxy resin-based primer from above, and a floor finishing material made of stone or tile adhered onto the floor reinforcing layer. The epoxy resin-based primer referred to here is an undercoat paint (primer) used in the undercoat process in the painting process performed in three steps: undercoat, intermediate coat, and top coat, and contains epoxy resin and anti-rust pigment as the main components. According to the above-mentioned configuration, a fiber reinforcement material such as glass fiber, carbon fiber, or aramid fiber is laid on the upper surface of the floor underlayment plywood, and then an epoxy resin primer is applied from above to form a floor reinforcement layer, and a floor finishing material made of stone or tile is bonded onto the floor reinforcement layer. By providing a floor reinforcement layer including a fiber reinforcement material between the floor finishing material and the floor underlayment plywood in this way, the rigidity in the out-of-plane direction of the entire floor structure including the floor finishing material and the floor underlayment plywood is increased, and cracking of the floor finishing material can be suppressed. In addition, impact noise that may occur when an object falls on the floor is transmitted from tiles or stone to the floor underlayment plywood via the floor reinforcing layer that is made of fiber reinforcement material. The sound is reduced when it passes through the fiber reinforcement material, so sound insulation performance can be improved. In this way, a floor structure can be provided that, when tiles or stone are used as finishing materials, can suppress cracking of the tiles or stone by increasing the rigidity, thereby improving sound insulation performance.

[0008] In one aspect of the present invention, the floor reinforcing layer is formed across the joints between the underfloor plywood panels. When using plywood as a siding material, it is necessary to lay the plywood so that multiple pieces of plywood are adjacent to each other. Here, at the joints between the plywood pieces, the section modulus and stiffness in the out-of-plane direction of the entire floor structure are reduced compared to the non-jointed parts, and the burden on the finishing material against the load acting from above may be large. As a result, the finishing material cannot withstand the load, and may crack at the joints between the plywood pieces. In contrast, according to the above-mentioned configuration, the floor reinforcing layer is formed across the joints between the underfloor plywoods, so the reduction in the section modulus and the stiffness in the out-of-plane direction at the joints between the underfloor plywoods is suppressed. Therefore, when a load is applied from above, the burden on the finishing material is reduced compared to when the floor reinforcing layer is not provided, and cracking of the finishing material is suppressed. In addition, since the gaps between the underfloor plywood boards are covered from above with the floor finishing material, sound can be prevented from passing from above to below through the gaps between the underfloor plywood boards.

[0009] In one aspect of the present invention, a polymer cement mortar layer is formed on the upper surface of the floor reinforcement layer, the floor finishing material is adhered to the floor reinforcement layer by the polymer cement mortar layer, and the floor reinforcement layer further comprises silica sand scattered on the upper surface of the epoxy resin-based primer. According to this configuration, the floor finishing material is adhered to the floor reinforcing layer by the polymer cement mortar layer. The polymer cement mortar is excellent in workability and can reduce costs compared to, for example, using an epoxy resin adhesive. In addition, the wet polymer cement mortar layer makes it easy to adhere the entire surface of the floor finishing material to the floor reinforcing layer, further increasing the rigidity of the floor structure. In addition, since the polymer cement mortar layer has a certain weight, it contributes to absorbing impact noise, thereby further improving the sound insulation performance. Furthermore, the silica sand spread on the top surface of the epoxy resin primer of the floor reinforcement layer can increase the bonding strength between the floor reinforcement layer and the polymer cement mortar layer provided to adhere the floor finishing material to the floor reinforcement layer.

[0010] In one aspect of the present invention, support legs are provided on the floor slab, and the floor base plywood is supported by the support legs, thereby forming a double floor. In a double floor, the plywood flooring is partially supported by the support legs, so compared to a straight floor, for example, the rigidity of the floor structure in the out-of-plane direction is lower, and the finishing material may bear a larger load from above. As a result, the finishing material may not be able to withstand the load and may crack. In contrast, with the above-described configuration, even in the case of such a double floor, the floor reinforcement layer increases the rigidity of the entire floor structure in the out-of-plane direction, thereby preventing the floor finishing material from cracking. Furthermore, in a double floor, a space is created between the underfloor plywood and the floor slab, which prevents sound from being transmitted directly from the underfloor plywood to the floor slab, further improving sound insulation performance. Effect of the Invention

[0011] According to the present invention, it is possible to provide a floor structure that, when tiles or stone are used as finishing materials, can suppress cracking of the tiles or stone by increasing the rigidity, thereby improving sound insulation performance. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a cross-sectional view showing a configuration of a floor structure according to an embodiment of the present invention. [Diagram 2] FIG. 2 is an enlarged cross-sectional view of a portion of the floor structure of FIG. [Diagram 3] FIG. 11 is a cross-sectional view showing the configuration of a modified example of the floor structure according to the embodiment of the present invention. [Figure 4]FIG. 1 is a plan view showing the arrangement of panels of floor finishing materials in an example, comparative example 1, and comparative example 2 when conducting an impact test in an example for examining the configuration of an embodiment of the present invention. [Diagram 5] FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] The present invention is a floor structure in which a floor underlayment plywood and a floor reinforcing layer are laid above a floor slab, and a floor finishing material is provided on the floor reinforcing layer. In the first embodiment, as a double floor structure, a floor reinforcing layer coated with an epoxy resin primer is provided on the upper surface of the floor underlayment plywood with either a glass fiber material, a carbon fiber material, or an aramid fiber material laid on the upper surface, and a floor finishing material made of stone or tiles is provided on the floor reinforcing layer (Figs. 1 and 2). A modified example is a direct-attached floor structure in which a floor underlayment plywood, a floor reinforcing layer, and a floor finishing material are provided on the upper surface of the floor slab in this order from the lower side (Fig. 3). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a floor structure according to the present invention will be described with reference to the accompanying drawings. A cross-sectional view showing the configuration of a floor structure according to an embodiment of the present invention is shown in Fig. 1. Fig. 2 is an enlarged cross-sectional view of a part of Fig. 1. The floor structure 1A includes a floor body 3 provided above a floor slab 2 and support legs 5 provided on the floor slab 2. The floor slab 2 is provided on each floor of the building. The floor slab 2 is made of reinforced concrete, precast concrete, or the like. A plurality of support legs 5 are provided at intervals in the horizontal direction on the floor slab 2. Each support leg 5 is formed in a rod shape and extends upward from the floor slab 2. Each support leg 5 supports the floor body 3 from below.

[0014] 2, the floor body 3 includes a particle board 31, a gypsum board 32, a floor heating mat 33, floor base plywood boards 34 and 35, a floor reinforcing layer 36, a polymer cement mortar layer 37, and a floor finishing material 38. The particle board 31, the gypsum board 32, the floor heating mat 33, the floor base plywood boards 34 and 35, the floor reinforcing layer 36, the polymer cement mortar layer 37, and the floor finishing material 38 are layered from bottom to top in this order. The particle board 31 is supported on a plurality of support legs 5. The particle board 31 is provided as a base material of the floor body 3.

[0015] The gypsum board 32 is provided on the particle board 31. The gypsum board 32 has high fire resistance, and if a fire occurs on one side of the gypsum board 32, the spread of the fire to the other side is suppressed. In addition, since the gypsum board 32 has high thermal insulation properties, the heat generated by the floor heating mat 33 provided on the gypsum board 32, which will be described next, is suppressed from escaping to the floor slab 2 below. Therefore, the heat is concentrated and transferred toward the upper interior of the room, and as a result, the heating efficiency of the floor heating mat 33 is improved. The floor heating mat 33 is provided on the gypsum board 32. The floor heating mat 33 is provided with a flow path through which an electric heating wire or a liquid heat medium flows, and is capable of heating the floor body 3. The floor heating mat 33 does not have to be provided so as to cover the entire floor body 3 when viewed from above, and may be provided so as to cover only a part of the floor body 3. Furthermore, the floor heating mat 33 may be omitted.

[0016] The underfloor plywoods 34, 35 are provided on the floor heating mat 33. The underfloor plywoods 34, 35 are so-called waste materials, and are wood plywood having a predetermined thickness, for example, softwood plywood. The lower underfloor plywood 34 and the upper underfloor plywood 35 may be of the same thickness, or one of the underfloor plywoods 34 and 35 may be thicker than the other. In this embodiment, two underfloor plywoods 34, 35 are provided, but only one or three or more may be stacked. The lower underfloor plywood 34 has a rectangular (generally rectangular) plate shape when viewed from above. The lower underfloor plywood 34 is laid so as to cover the entire surface of the floor heating mat 33. The upper underfloor plywood 35 also has a rectangular (generally rectangular) board shape when viewed from above, similar to the lower underfloor plywood 34. The upper underfloor plywood 35 is laterally offset from the joint J of the lower underfloor plywood 34 so that the joint J between adjacent underfloor plywoods 35, i.e., the portions where the end faces of horizontally adjacent underfloor plywoods 35 face and abut each other, do not extend parallel at least at the same position as the joint J of the lower underfloor plywood 34 when viewed in a plane. In this way, the floor underlayment plywood 34, 35 is disposed above the floor slab 2. The floor underlayment plywood 34, 35 is supported on a plurality of support legs 5 via the particle board 31, the gypsum board 32, and the floor heating mat 33.

[0017] The floor reinforcing layer 36 is provided along the upper surface of the upper underfloor plywood 35. The floor reinforcing layer 36 includes a fiber reinforcing material 36f, an epoxy resin-based primer 36b, and silica sand 36s. The fiber reinforcement material 36f is laid on the upper surface of the upper underfloor plywood 35. The fiber reinforcement material 36f is any one of glass fiber material, carbon fiber material, and aramid fiber material. The fiber reinforcement material 36f is formed into a net shape or a sheet shape by weaving any one of glass fiber, carbon fiber, and aramid fiber and further coating it with, for example, vinyl chloride. The fiber reinforcement 36f of the floor reinforcement layer 36 is formed in a rectangular shape when viewed from above. A plurality of fiber reinforcement members 36f are arranged on the upper layer of the underfloor plywood 35. It is preferable that the ends of adjacent fiber reinforcement members 36f overlap by, for example, about 50 to 100 mm. In this way, when viewed in plan, the fiber reinforcement members 36f are in a state where the joints between the fiber reinforcement members 36f are not visible over the entire surface of the upper layer of the underfloor plywood 35. As a result, the fiber reinforcement members 36f are arranged so as to straddle the joints J between the laterally adjacent underfloor plywoods 34, 35. The epoxy resin primer 36b is applied onto the fiber reinforcement material 36f. The epoxy resin primer 36b is cured in a state in which the fiber reinforcement material 36f is impregnated with the epoxy resin primer 36b, and is thereby substantially integrated with the fiber reinforcement material 36f. The fiber reinforcing material 36f and the epoxy resin primer 36b form a so-called fiber reinforced plastic.

[0018] The silica sand 36s is spread on the upper surface of the epoxy resin primer 36b. As described later, the silica sand 36s is spread before the epoxy resin primer 36b hardens during construction, so that a part of the lower side is embedded in or attached to the epoxy resin primer 36b and an upper side is in a state of protruding upward from the epoxy resin primer 36b. The silica sand 36s is provided as a gripping material that increases the bonding strength of the floor finishing material 38 to the floor reinforcing layer 36 and suppresses the slippage of the floor finishing material 38 by being interposed between the fiber reinforcement material 36f and the epoxy resin primer 36b of the floor reinforcing layer 36 and the polymer cement mortar layer 37 used to bond the floor finishing material 38 to the floor reinforcing layer 36. It is preferable to use silica sand 36s with a typical particle size of about 1.2 mm (No. 3 silica sand) to about 0.2 mm (No. 7 silica sand).

[0019] The polymer cement mortar layer 37 is formed on the upper surface of the floor reinforcement layer 36. The polymer cement mortar layer 37 bonds the floor reinforcement layer 36 to the floor finishing material 38. The polymer cement mortar layer 37 is provided so as to cover the entire upper surface of the floor reinforcement layer 36, and firmly bonds the floor reinforcement layer 36 to the floor finishing material 38 over the entire surfaces. The floor finishing material 38 is adhered onto the floor reinforcing layer 36 via a polymer cement mortar layer 37. The floor finishing material 38 is made of stone or tile. The floor finishing material 38 is formed in advance into a panel shape having a predetermined dimension. When viewed from above, the floor finishing material 38 is formed into, for example, a rectangular panel shape. A plurality of floor finishing materials 38 are laid side by side on the polymer cement mortar layer 37. A joint material 39 is sandwiched in the gap between adjacent floor finishing materials 38.

[0020] To construct such a floor structure 1A, first, a plurality of support legs 5 are installed at predetermined positions on the floor slab 2. Next, particle boards 31, gypsum boards 32, floor heating mats 33, and floor underlayment plywoods 34, 35 are sequentially stacked and installed on the plurality of support legs 5. If there is a gap of a predetermined dimension (e.g., 1 mm) or more between adjacent upper floor underlayment plywoods 35, it is preferable to inject a caulking material into the gap to prevent leakage of the epoxy resin-based primer 36b to be applied later. Thereafter, a plurality of fiber reinforcement materials 36f are laid on the upper surface of the upper underfloor plywood 35. At this time, adjacent fiber reinforcement materials 36f are provided so as to overlap, for example, by about 50 to 100 mm. Then, each fiber reinforcement material 36f is temporarily fixed with a tacker or the like, and then an epoxy resin primer 36b is applied onto the fiber reinforcement material 36f. It is preferable to apply the epoxy resin primer 36b using, for example, a metal trowel, and apply the primer with trowel pressure so as not to lift the fiber reinforcement material 36f. Next, before the epoxy resin primer 36b hardens, silica sand 36s is spread on the epoxy resin primer 36b. After that, a predetermined period of curing is performed, and the epoxy resin primer 36b hardens, forming a floor reinforcing layer 36 including a fiber reinforced plastic layer made of the fiber reinforcement material 36f and the epoxy resin primer 36b.

[0021] Next, a primer for the polymer cement mortar layer 37 is applied onto the floor reinforcing layer 36, and then polymer cement mortar for forming the polymer cement mortar layer 37 is applied to a predetermined thickness. The polymer cement mortar may also be applied to the back surface of the floor finishing material 38. Thereafter, floor finishing material 38 is attached onto polymer cement mortar layer 37. After a predetermined time of curing, polymer cement mortar layer 37 hardens, and then joint material 39 is filled between adjacent floor finishing materials 38, thereby completing the construction of floor structure 1A.

[0022] The floor structure 1A as described above includes underfloor plywood 34, 35 provided above the floor slab 2, a floor reinforcement layer 36 formed by laying fiber reinforcement material 36f made of glass fiber, carbon fiber, or aramid fiber on the upper surface of the underfloor plywood 34, 35 and applying an epoxy resin-based primer 36b thereon, and a floor finishing material 38 made of stone or tile bonded onto the floor reinforcement layer 36. According to the above-mentioned configuration, a fiber reinforcement material 36f made of any one of glass fiber, carbon fiber, and aramid fiber is laid on the upper surface of the floor base plywood 34, 35, and an epoxy resin primer 36b is applied thereon to form a floor reinforcement layer 36, and a floor finishing material 38 made of stone or tiles is bonded onto the floor reinforcement layer 36. In this way, by providing the floor reinforcement layer 36 including the fiber material 36f between the floor finishing material 38 and the floor base plywood 34, 35, the rigidity in the out-of-plane direction of the entire floor structure 1A including the floor finishing material 38 and the floor base plywood 34, 35 is increased, and cracking of the floor finishing material 38 can be suppressed. In addition, impact noise that may occur when an object falls on the floor surface is transmitted from the tiles or stone of the floor finishing material 38 through the floor reinforcing layer 36 that is configured with fiber reinforcing material 36f to the floor base plywood 34, 35. The sound is reduced when passing through the fiber reinforcing material 36f, so sound insulation performance can be improved. In this way, when tiles or stone are used as the floor finishing material 38, a floor structure 1A can be provided that can suppress cracking of the tiles or stone by increasing the rigidity, and can improve sound insulation performance.

[0023] In particular, the floor reinforcement layer 36 comprises a layer of fiber reinforced plastic formed by fiber reinforcement material 36f and an epoxy resin based primer 36b. According to the above-mentioned configuration, the floor structure 1A can be properly realized.

[0024] In addition, the floor reinforcing layer 36 is formed across the joints J between the underfloor plywood boards 35. When using plywood as a siding material, it is necessary to lay the plywood so that multiple pieces of plywood are adjacent to each other. Here, at the joints between the plywood pieces, the section modulus and stiffness in the out-of-plane direction of the entire floor structure are reduced compared to the non-jointed parts, and the burden on the finishing material against the load acting from above may be large. As a result, the finishing material cannot withstand the load, and may crack at the joints between the plywood pieces. In contrast, according to the above-mentioned configuration, the floor reinforcing layer 36 is formed across the joints between the underfloor plywoods 35, which suppresses the reduction in the section modulus and the rigidity in the out-of-plane direction at the joints J between the underfloor plywoods 35. Therefore, when a load acts from above, the burden on the finishing material 38 is reduced compared to when the floor reinforcing layer 36 is not provided, and cracking of the finishing material 38 is suppressed. In addition, since the gaps between the underfloor plywood 35 are covered from above with the floor finishing material 38, sound can be prevented from passing through the gaps between the floor finishing material 38 from above to below.

[0025] In addition, in the floor structure 1A, a polymer cement mortar layer 37 is formed on the upper surface of the floor reinforcement layer 36, and the floor finishing material 38 is adhered to the floor reinforcement layer 36 by the polymer cement mortar layer 37, and the floor reinforcement layer 36 further includes silica sand 36s spread on the upper surface of the epoxy resin-based primer 36b. According to this configuration, the floor finishing material 38 is adhered to the floor reinforcing layer 36 by the polymer cement mortar layer 37. The polymer cement mortar is easy to apply and can reduce costs, as compared with the use of, for example, an epoxy resin adhesive. In addition, the wet polymer cement mortar layer 37 makes it easy to bond the entire surface of the floor finishing material 38 to the floor reinforcing layer 36, thereby further increasing the rigidity of the floor structure 1A. Furthermore, since polymer cement mortar layer 37 has a certain weight, it contributes to absorbing impact noise, and can further improve sound insulation performance. Furthermore, the silica sand 36s spread on the top surface of the epoxy resin primer 36b of the floor reinforcement layer 36 increases the bonding strength between the floor reinforcement layer 36 and the polymer cement mortar layer 37 provided for adhering the floor finishing material 38 to the floor reinforcement layer 36.

[0026] Here, instead of the floor reinforcing layer 36 including the fiber reinforcing material 36f and the epoxy resin primer 36b as shown in this embodiment, it is also possible to use a metal plate such as an aluminum plate as the floor reinforcing layer 36. When a metal plate is used, the provision of the polymer cement mortar layer 37 may cause the metal plate to corrode. For this reason, when a metal plate is used, it is necessary to use an epoxy resin adhesive to bond the floor finishing material 38 onto the floor reinforcing layer 36 in order to prevent corrosion of the metal plate. In addition, in the case of a method of bonding the floor finishing material 38 using an epoxy resin adhesive, there is a problem that the epoxy resin adhesive cannot be applied uniformly compared to a bonding method using polymer cement mortar, and therefore construction is not easy. In contrast, as shown in this embodiment, the floor structure can be formed by first laying the fiber reinforcement material, then applying an epoxy resin primer thereon to form a floor reinforcement layer, and then providing a polymer cement mortar layer 37 and a floor finishing material 38 on the floor reinforcement layer. Therefore, the application of the epoxy resin primer can be easily performed.

[0027] In addition, in the floor structure 1A, support legs 5 are provided on the floor slab 2, and the floor base plywood boards 34, 35 are supported by the support legs 5, thereby forming a double floor. In a double floor, the plywood flooring is partially supported by the support legs, so compared to a straight floor, for example, the rigidity of the floor structure in the out-of-plane direction is lower, and the finishing material may bear a larger load from above. As a result, the finishing material may not be able to withstand the load and may crack. In contrast, with the above-described configuration, even in the case of such a double floor, the floor reinforcing layer 36 increases the rigidity of the entire floor structure 1A in the out-of-plane direction, thereby preventing the floor finishing material 38 from cracking. In addition, in a double floor, a space is created between the floor underlayment plywood 34, 35 and the floor slab 2, which prevents sound from being transmitted directly from the floor underlayment plywood 34, 35 to the floor slab 2, thereby further improving sound insulation performance.

[0028] (Modification of the embodiment) The floor structure of the present invention is not limited to the above-described embodiment explained with reference to the drawings, and various modifications are possible within the technical scope. FIG. 3 is a cross-sectional view showing a floor structure according to a modified example of the embodiment. For example, in the above embodiment, the floor structure 1A is a double floor in which the floor body 3 is supported by the support legs 5 provided on the floor slab 2, but this is not limited to this. As shown in Fig. 3, in the floor structure 1B of this modification, the floor body 3B is formed on the floor slab 2 via the leveling mortar 10. In other words, the floor structure 1B of this modification is a so-called direct floor. The floor structure 1B is provided by sequentially stacking the floor base plywood 34, 35, the floor reinforcing layer 36, the polymer cement mortar layer 37, and the floor finishing material 38 as described in the above embodiment. In the floor structure 1B configured in this manner, as in the above embodiment, when tiles or stone are used as the floor finishing material 38, it is possible to provide a floor structure 1B that can suppress cracking of the tiles or stone by increasing the rigidity, thereby improving sound insulation performance.

[0029] (Other variations) In addition, in the above embodiment, specific examples are given for each component constituting the floor structures 1A and 1B, but as long as it does not deviate from the gist of the present invention, it is possible to select and discard the configurations given in the above embodiment or to change them to other configurations as appropriate.

[0030] (Example) Here, the floor structure 1A having the configuration as shown in the above embodiment was examined, and the results are shown below. First, a test specimen simulating the floor structure 1A shown in Fig. 1 was prepared. The size of the test specimen was 3060 x 2752 mm, the spacing between the support legs 5 was 455 x 300 mm, and the height of the support legs 5 was 272 mm. The floor body 3 installed on the support legs 5 was Particleboard 31: 1820 x 600 x 20 mm Gypsum board 32 (fiber reinforced gypsum board): 1820 x 910 x 9.5 mm Floor heating mat 33: 2727 x 2682 x 12 mm Floor underlayment plywood 34 (waste material, coniferous plywood): 1820 x 910 x 12 mm Floor underlayment plywood 35 (waste material, coniferous plywood): 1820 x 910 x 12 mm It was decided. The floor finishing material 38 is tiled, with two tile sizes: 600 x 600 x 10 mm and 1200 x 600 x 10 mm.

[0031] In an example corresponding to the configuration of the above embodiment, fiber reinforcement material 36f made of a glass fiber net and epoxy resin-based primer 36b were used for floor reinforcement layer 36, and polymer cement mortar was used to form polymer cement mortar layer 37 as an adhesive for bonding floor reinforcement layer 36 and floor finishing material 38. Polymer cement mortar was used as joint material 39. In Comparative Example 1, an aluminum plate (metal plate) was used instead of the floor reinforcing layer 36. The aluminum plate was laid partially so as to cover the upper part of the joint J between adjacent floor plywood panels 35, rather than the entire surface of the floor plywood panels 35. An epoxy resin adhesive was used as the bonding material, and a synthetic resin emulsion joint material was used as the joint material. In Comparative Example 2, no reinforcing material was used in place of the floor reinforcing layer 36, and the same polymer cement mortar as in the Example was used as the adhesive material, and a synthetic resin emulsion-based joint material was used as the joint material. In each of the configurations of the Example, Comparative Example 1, and Comparative Example 2, as shown in Figure 4, an area A1 where tiles of 600 x 600 x 10 mm were laid and an area A2 where tiles of 1200 x 600 x 10 mm were laid were provided as floor finishing material 38.

[0032] An impact test was carried out for each of the Example, Comparative Example 1, and Comparative Example 2 described above. The distance from the bottom of the sandbag to the surface of the tile was defined as the drop height, and a 30 kg sandbag was allowed to freely drop from a drop height of 30 cm, and this was repeated three times. After each drop, the tiles were visually checked for cracks or other abnormalities. If no cracks were found, the drop height was increased to 40 cm and 50 cm, and the same procedure was repeated three times. The impact point where the impact is applied is A: Intersection of the joint of the particle board 31 and the joint of the floor underlayment plywood 35 B: Intersection of the joint of the gypsum board 32 and the joint of the floor base plywood 35 C: Intersection of the joint of the floor underlayment plywood 34 and the joint of the floor underlayment plywood 35 D: Center of panel E: Intersection of the joint of the particle board 31 and the joint of the gypsum board 32 F: Intersection of the joint of the gypsum board 32 and the joint of the floor base plywood 34 G: Intersection of the joint of the particle board 31 and the joint of the floor underlayment plywood 34 H: Joint of floor plywood 35

[0033] The results of the above test are shown in FIG. As shown in FIG. 5, in Comparative Example 1 and the Example, no abnormalities such as cracks were found in the tiles of the floor finishing material 38, regardless of the size of the tiles and the location of the impact. In contrast, in Comparative Example 2, in the 600×600 mm tile, cracks occurred at impact point A the first time the tile was dropped from a height of 30 cm, and cracks occurred at impact point B the first time the tile was dropped from a height of 40 cm. In addition, in the 600×1200 mm tile, cracks occurred at impact point B the first time the tile was dropped from a height of 40 cm, and cracks occurred at impact point C the first time the tile was dropped from a height of 50 cm. Impact points A to C are common to the joints of the floor underlay plywood 35, and other than that, impact point A is the joint of the particle board 31, impact point B is the joint of the gypsum board 32, and impact point C is the joint of the floor underlay plywood 34, and the floor finishing material 38 with a joint on the lower surface side was more vulnerable to impact. This is thought to be because the floor finishing material 38 with a joint on the lower surface side has a smaller section modulus as a composite board and is more likely to crack. In comparison with Comparative Example 1 and the embodiment, Comparative Example 2 has a specification in which no reinforcing material is provided between the floor underlayment plywood 35 and the floor finishing material 38.

[0034] From these findings, it was confirmed that in tiled floor finishing materials 38 of 600 x 600 mm or more as in Comparative Example 1 and the Examples, reinforcement by a floor reinforcing layer 36 containing an aluminum plate, fiber reinforcing material 36f, and epoxy resin-based primer 36b between the floor base plywood 35 and the floor finishing material 38 is effective as a shock resistant measure. In addition, it was confirmed that there is no problem in impact resistance in either the epoxy resin-based adhesive in Comparative Example 1 or the polymer cement mortar layer 37 in the Examples as an adhesive for bonding the floor base plywood 35 and the floor finishing material 38. However, as already explained, when using an aluminum plate as the floor reinforcing layer as in Comparative Example 1, an epoxy resin adhesive, which has lower workability than polymer cement mortar, must be used to bond the floor finishing material 38. For this reason, when comparing the examples including workability, it can be said that the examples are more preferable overall than Comparative Example 1. [Explanation of symbols]

[0035] 1A, 1B Floor structure 36f Fiber reinforcement material 2 Floor slab 36s silica sand 5 Support leg 37 Polymer cement mortar layer 34, 35 Floor underlayment plywood 38 Floor finishing material 36 Floor reinforcement layer J joint 36b Epoxy resin primer

Claims

1. A floor underlayment plywood provided above the floor slab; a floor reinforcing layer formed by laying a fiber reinforcing material selected from glass fiber material, carbon fiber material, and aramid fiber material on the upper surface of the floor base plywood and applying an epoxy resin-based primer thereon; A floor finishing material made of stone or tile bonded onto the floor reinforcing layer; A floor structure comprising:

2. 2. The floor structure according to claim 1, wherein the floor reinforcing layer is formed across joints between the underfloor plywood panels.

3. A polymer cement mortar layer is formed on the upper surface of the floor reinforcing layer, and the floor finishing material is adhered to the floor reinforcing layer by the polymer cement mortar layer; 3. The floor structure according to claim 1, wherein the floor reinforcing layer further comprises silica sand spread on the upper surface of the epoxy resin-based primer.

4. 3. The floor structure according to claim 1, wherein a support leg is provided on the floor slab, and the floor base plywood is supported by the support leg, thereby forming a double floor.

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