Laminated structure

Abstract

To provide a floor structure in which the hardness of a floor is constant even at different places.SOLUTION: A floor structure includes a hollow structure 50 on concrete 30 of a building, and includes a floor material 70 on the hollow structure 50. The concrete 30 includes a leveling material 32. Under the concrete 30, a damp-proof sheet 10 and / or a heat insulation material 20 is provided. The hollow structure 50 is formed as a panel rectangular in a plan view. Each panel is arranged in a break joint-like manner on the concrete 30, and the thickness of the hollow structure 50 and the floor material 70 combined together is thinner than the thickness of the concrete 30.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a floor structure provided in a building. [Background technology]

[0002] Double-floor structures are used in buildings, particularly in facilities where various types of exercise are performed, such as gymnasiums, judo halls, kendo halls, and fitness studios. In this double-floor structure, metal support legs are first installed at regular intervals vertically and horizontally on a concrete surface that has been poured at a certain height. Then, linear metal joists are placed in parallel on the multiple support legs lined up vertically or horizontally, and linear metal joists are placed in parallel on the joists at regular intervals in a direction perpendicular to the extension direction of the joists. Furthermore, flooring materials such as floorboards are placed on the joists.

[0003] Patent Document 1 describes a double floor structure for a gymnasium in which joists are placed on support legs fixed at regular intervals on a concrete foundation, and vibration-damping curved steel plates with an uneven cross-section are placed on top of those as floor joists, and a surface panel is placed on top of that. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 8-109735 Summary of the Invention [Problem to be solved by the invention]

[0005] Incidentally, in the double floor structure described in Patent Document 1, the floor material is supported by vibration-damping bent steel plates, which are joists, but this vibration-damping bent steel plate is uneven, and there are some places where the bottom of the floor material is in contact with the vibration-damping bent steel plate and some places where it is not. In addition, the vibration-damping bent steel plate is supported by the sills, but the sills are also arranged at regular intervals, so there are some places where the bottom of the vibration-damping bent steel plate is in contact with the sills and some places where it is not. Furthermore, the sills are supported by the support legs, but the support legs are also arranged at regular intervals, so there are some places where the bottom of the sills is in contact with the support legs and some places where it is not. That is, in the double floor structure of Patent Document 1, there are some places where the vibration-damping bent steel plate, sills, and support legs, which are joists, are located under the floor material and some places where they are not, and due to the difference in the structure, the hardness of the floor differs depending on the location. And if the hardness of the floor differs, the shock absorption rate and the rebound amount of the ball will also differ. The hardness of the floor refers to the hardness of the surface of the floor material, including the influence of the vertical deflection rigidity of the entire floor structure. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention is characterized in that a hollow structure is provided on the concrete of a building, and a synthetic resin floor material is provided on the hollow structure. The concrete is characterized by including a leveling material.

[0007] The concrete is characterized by having a heat insulating material and / or a moisture-proof sheet underneath. The hollow structure is formed as a rectangular panel when viewed from above, and each panel is arranged on the concrete in the form of a broken joint.

[0008] The combined thickness of the hollow structure and the floor material is thinner than the thickness of the concrete. Effect of the Invention

[0009] According to the present invention, it is possible to provide a floor structure in which the hardness of the floor is almost uniform everywhere. [Brief description of the drawings]

[0010] [Figure 1] FIG. 2 is a schematic cross-sectional view of the floor structure of the present embodiment. [Diagram 2] FIG. 4 is a plan view showing the arrangement of hollow structure panels. [Diagram 3] FIG. 3(a) is a cross-sectional perspective view of a hollow structure, FIG. 3(b) is a cross-sectional schematic view along line α-α of FIG. 3(a), and FIG. 3(c) is a cross-sectional schematic view along line β-β of FIG. 3(a). [Figure 4] FIG. 4(a) is a partial perspective view of the sheet material constituting the core layer, FIG. 4(b) is a partial perspective view showing the state of the sheet material in the middle of being folded, and FIG. 4(c) is a partial perspective view showing the state of the sheet material after it has been folded. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, one embodiment of the floor structure of a building in which the present invention is embodied in a gymnasium will be described with reference to Figures 1 to 4. Note that the floor structure in this embodiment means a structure formed on the ground, and does not include the ground.

[0012] Fig. 1 shows a schematic cross-sectional view of the floor structure of this embodiment. The floor structure of this embodiment is a gymnasium floor structure, and specifically, a moisture-proof sheet 10, a heat insulating material 20, concrete 30, an adhesive 40, a hollow structure 50, an adhesive 60, and a floor material 70 are laminated from the bottom on the ground. Note that Fig. 1 is a schematic diagram for explaining the laminated structure of each member, and the thickness of each member is not shown accurately.

[0013] The ground is made of soil having a certain area formed by digging into the ground to a certain depth, and the top surface is leveled to a certain degree. A moisture-proof sheet 10 is laid on the ground. The moisture-proof sheet 10 is laid on the ground to protect structures such as concrete 30 from moisture in the ground. As the moisture-proof sheet 10, a sheet having a known moisture-proof function, such as a polyethylene sheet, can be used. There is no particular limit to the thickness as long as it can exhibit the moisture-proof function, but a typical polyethylene sheet having a thickness of 0.1 to 2.0 mm can be used.

[0014] A heat insulating material 20 is laid on the moisture-proof sheet 10. The heat insulating material 20 is laid above the ground to prevent the heat of the ground from directly acting on structures such as concrete 30. As the heat insulating material 20, a known heat insulating material such as a sheet-shaped material or a panel-shaped material such as expanded polystyrene can be used. There is no particular limit to the thickness, and it may be determined according to the material used, but in the case of expanded polystyrene, a material with a thickness of 10 to 100 mm can be used.

[0015] Concrete 30 is formed on the insulation material 20. The concrete 30 is composed of a concrete floor 31 and a leveling material 32 formed on top of it. Note that the concrete floor 31 poured on the gymnasium floor has reinforcing bars arranged inside, but the reinforcing structure such as the reinforcing bars is not shown in FIG. 1.

[0016] The concrete floor 31 is a concrete floor generally used as the foundation of a gymnasium, and its thickness can be in the range of 12 to 30 cm, preferably about 15 to 20 cm.

[0017] In addition, a leveling material 32 is layered on the upper surface of the concrete floor 31. In general, when the concrete floor 31 is poured, the upper surface becomes uneven, and it is difficult to ensure the levelness and smoothness of the upper surface with the concrete floor 31 alone. For this reason, a leveling material 32 with high fluidity is poured into the upper surface of the concrete floor 31 to a certain thickness, and is integrated with the concrete floor 31 to realize the levelness and smoothness of the upper surface. The leveling material 32 to be used is not particularly limited, and a known leveling material 32 having self-leveling properties such as cement-based or mortar can be used. The thickness of the leveling material 32 is not particularly limited, but can be in the range of 1 to 3 cm to achieve the levelness and smoothness on the concrete floor 31. A hollow structure 50 is fixed by an adhesive 40 to the entire upper surface of the concrete 30 that has been leveled and smoothed by the leveling material 32.

[0018] The hollow structure 50 is made of resin and is formed as a hollow structure panel 50P (hereinafter simply referred to as "panel 50P") having a rectangular plate shape in plan view. As an example, the panel 50P is formed into a plate shape having a rectangular shape in plan view with long sides of 180 cm and short sides of 90 cm, and a thickness of about 3 to 30 mm. The hollow structure 50 can have a compression strength in the range of 0.5 to 5 MPa, preferably in the range of 0.5 to 4 MPa, and more preferably in the range of 2 to 4 MPa.

[0019] Each panel 50P is fixed to and supported on the upper surface of the concrete 30 by an adhesive 40. The adhesive 40 used to fix the concrete 30 and the panel 50P is not particularly limited as long as it is capable of bonding and fixing the two together, and examples of adhesives that can be used include a urethane adhesive, an epoxy adhesive, a silicone adhesive, an acrylic adhesive, and a vinyl acetate adhesive.

[0020] 2 shows a plan view of a gymnasium covered with panels 50P. As shown in the figure, the panels 50P are laid without gaps over the entire upper surface of the concrete 30 (not shown) and fixed with an adhesive 40 (not shown). Each panel 50P is arranged so that the short side (90 cm side) of the panel 50P is offset by 1 / 2 of a panel 50P in the longitudinal direction from the adjacent panel 50P in the short side direction so that the short side is not continuous with the short side of the other panel adjacent in the direction in which the short side extends, creating a so-called break joint.

[0021] In addition, there are places where the space for arranging the panel 50P does not match the shape of the panel 50P, such as near the wall or in the corners of the gymnasium, as shown at the top and left ends of Figure 2. In such places, the panel 50P can be cut to fit the shape of the space.

[0022] A synthetic resin flooring 70 is placed over the entire upper surface of the hollow structure 50 via an adhesive 60. The flooring 70 is configured to be located at the top of the gymnasium floor structure. There are no particular limitations on what can be used as the flooring 70 as long as it is made of synthetic resin, and it may be anything that is generally used as a flooring 70 for indoor sports facilities. For example, a surface layer made of a synthetic resin sheet with a urethane layer on the lower side and a polyvinyl chloride layer on the upper side can be used. The flooring 70 can be fixed to the upper surface of the hollow structure 50 with an adhesive 60. A known adhesive can be used as the adhesive 60 used for this fixation, and it may be appropriately selected depending on the material of the flooring 70 used. It is preferable that the thickness of the flooring 70 is thinner than the thickness of the hollow structure 50 (panel 50P).

[0023] The hollow structure 50 will be described in more detail below. 3(a) shows a cross-sectional perspective view of the hollow structure 50. As shown in the figure, the hollow structure 50 has a hollow plate shape as a whole with a plurality of columnar cells S arranged side by side inside.

[0024] FIG. 3(b) shows an α-α line cross section of FIG. 3(a), and FIG. 3(c) shows a β-β line cross section of FIG. 3(a). As shown in FIG. 3(b) and FIG. 3(c), the hollow structure 50 is composed of a core layer 51 in which a plurality of columnar cells S are arranged side by side, and sheet-like skin layers 52 and 53 bonded to both the upper and lower surfaces of the core layer 51. The core layer 51 is formed by folding a sheet material made of a thermoplastic resin molded into a predetermined shape. The core layer 51 is composed of an upper wall portion 54, a lower wall portion 55, and a side wall portion 56 that is erected between the upper wall portion 54 and the lower wall portion 55 and divides the cells S into a hexagonal column shape.

[0025] As shown in FIG. 3(b) and FIG. 3(c), the cells S formed in the core layer 51 include a first cell S1 and a second cell S2 having different structures. As shown in FIG. 3(b), the first cell S1 has a two-layered upper wall 54 on the upper part of the side wall 56. The layers of the two-layered upper wall 54 are bonded to each other. The first cell S1 has a one-layered lower wall 55 on the lower part of the side wall 56. On the other hand, as shown in FIG. 3(c), the second cell S2 has a one-layered upper wall 54 on the upper part of the side wall 56. The second cell S2 has a two-layered lower wall 55 on the lower part of the side wall 56. The layers of the two-layered lower wall 55 are bonded to each other. As shown in FIG. 3(b) and FIG. 3(c), the adjacent first cells S1 and the adjacent second cells S2 are separated by the two-layered side wall 56. The two-layered sidewall portions 56 have portions that are not heat-welded to each other in the center in the thickness direction of the core layer 51. Therefore, the internal space of each cell S of the core layer 51 communicates with the internal spaces of the other cells S through the two-layered sidewall portions 56.

[0026] As shown in Fig. 3(a), the first cells S1 are arranged in a row along the X direction. Similarly, the second cells S2 are arranged in a row along the X direction. The rows of the first cells S1 and the rows of the second cells S2 are alternately arranged in the Y direction perpendicular to the X direction. The first cells S1 and the second cells S2 form a honeycomb structure as a whole in the core layer 51.

[0027] As shown in Figures 3(a) to 3(c), a skin layer 52, which is a sheet material made of thermoplastic resin, is bonded to the upper surface of the core layer 51 configured as described above. In addition, a skin layer 53, which is a sheet material made of thermoplastic resin, is bonded to the lower surface of the core layer 51. The core layer 51 and the skin layers 52 and 53 form a hollow plate-like hollow structure. An example of a hollow structure 50 configured in this way is the Texel (registered trademark) series, a product of Gifu Plastic Industry Co., Ltd.

[0028] A method for manufacturing the hollow structural body 50 will now be described. As shown in FIG. 4(a), the first sheet material 100 is formed by forming a sheet made of thermoplastic resin into a predetermined shape. In the first sheet material 100, band-shaped planar regions 110 and bulging regions 120 are alternately arranged in the longitudinal direction (X direction) of the first sheet material 100. In the bulging region 120, a first bulging portion 121 having a cross section of a downward groove shape consisting of an upper surface and a pair of side surfaces is formed over the entire extending direction (Y direction) of the bulging region 120. Note that the angle between the upper surface and the side surface of the first bulging portion 121 is preferably 90 degrees, and as a result, the cross section of the first bulging portion 121 is a downward U-shape. In addition, the width of the first bulging portion 121 (the length of the short side of the upper surface) is set to be equal to the width of the planar region 110 and twice the length of the bulging height of the first bulging portion 121 (the length of the short side of the side surface).

[0029] In addition, in the bulging region 120, a plurality of second bulging portions 122, each of which has a cross-sectional shape that is a trapezoid obtained by bisecting a regular hexagon at its longest diagonal, are formed so as to be perpendicular to the first bulging portion 121. The bulging height of the second bulging portion 122 is set to be equal to the bulging height of the first bulging portion 121. In addition, the interval between adjacent second bulging portions 122 is equal to the width of the upper surface of the second bulging portion 122.

[0030] The first bulging portion 121 and the second bulging portion 122 are formed by partially bulging the sheet upwards by utilizing the plasticity of the sheet. The first sheet material 100 can be formed from a single sheet by a known forming method such as vacuum forming or compression forming.

[0031] As shown in Fig. 4(a) and Fig. 4(b), the first sheet material 100 is folded along the boundary lines P and Q to form the core layer 51. Specifically, the first sheet material 100 is valley-folded at the boundary line P between the flat area 110 and the bulging area 120, and mountain-folded at the boundary line Q between the top surface and side surface of the first bulging portion 121 to compress in the X direction. Then, as shown in Fig. 4(b) and Fig. 4(c), the top surface and side surface of the first bulging portion 121 are folded over, and the end surface of the second bulging portion 122 and the flat area 110 are folded over, thereby forming one rectangular column-shaped partition 130 extending in the Y direction for one bulging area 120. Such partitions 130 are continuously formed in the X direction to form the hollow plate-shaped core layer 51.

[0032] When the first sheet material 100 is compressed as described above, the upper wall portion 54 of the core layer 51 is formed by the upper surface and side surface of the first bulge portion 121, and the lower wall portion 55 of the core layer 51 is formed by the end surface of the second bulge portion 122 and the flat region 110. As shown in Fig. 4(c), the portion of the upper wall portion 54 where the upper surface and side surface of the first bulge portion 121 are folded over to form a two-layer structure, and the portion of the lower wall portion 55 where the end surface of the second bulge portion 122 and the flat region 110 are folded over to form a two-layer structure respectively become overlapping portions 131.

[0033] Moreover, a hexagonal columnar region formed by folding the second bulging portion 122 becomes the second cell S2, and a hexagonal columnar region formed between a pair of adjacent partitions 130 becomes the first cell S1. In this embodiment, the upper surface and side surface of the second bulging portion 122 form the side wall portion 56 of the second cell S2, and the side surface of the second bulging portion 122 and a flat portion located between the second bulging portions 122 in the bulging region 120 form the side wall portion 56 of the first cell S1. The contact portion between the upper surfaces of the second bulging portions 122 and the contact portion between the flat portions in the bulging region 120 form the side wall portion 56 having a two-layer structure. Note that, when carrying out such a folding process, it is preferable to heat-treat the first sheet material 100 so as to soften it.

[0034] A second sheet material made of a thermoplastic resin is bonded by thermal welding to the upper and lower surfaces of the core layer 51 obtained in this manner. The second sheet material bonded to the upper surface of the core layer 51 becomes the skin layer 52, and the second sheet material bonded to the lower surface of the core layer 51 becomes the skin layer 53.

[0035] When the second sheet material (skin layers 52, 53) is heat-welded to the core layer 51, the two-layered upper wall portions 54 (overlapped portions 131) of the first cell S1 are heat-welded to each other. Similarly, the two-layered lower wall portions 55 (overlapped portions 131) of the second cell S2 are heat-welded to each other. On the other hand, the two-layered side wall portions 56 of the first cell S1 and the second cell S2 are less susceptible to heat transfer than the upper wall portions 54 and the lower wall portions 55. Therefore, the two-layered side wall portions 56 have portions that are not heat-welded to each other. As a result, the internal space of each cell S is not a completely closed space, and the internal spaces of each cell S communicate with each other through the two-layered side wall portions 56 that are not heat-welded to each other.

[0036] The long hollow structural body 50 thus manufactured can be cut to a predetermined length and width to form a panel 50P. The floor structure of the above embodiment can provide the following effects.

[0037] (1) In conventional floor structures, support legs, joists, and floor beams are placed on concrete, but in the above embodiment, the hollow structure 50 is provided on the concrete 30, making construction easier.

[0038] (2) Because the panel 50P of the hollow structure 50 is laid over the entire upper surface of the concrete 30, there are no areas where structures (support legs, joists, and floor joists) are present between the concrete 30 and the floor material 70 as in the past, and the hardness of the floor is almost uniform even if the location of the floor material 70 changes. This results in no variation in shock absorption, and the floor's feel when stepped on and the ball's rebound from the floor are the same.

[0039] (3) The hollow structure 50 is approximately 3 to 30 mm thick, and even with the adhesives 40 and 60, the distance between the top surface of the concrete 30 and the bottom surface of the flooring 70 is approximately 5 to 35 mm. This makes it possible to narrow the distance between the top surface of the concrete 30 and the bottom surface of the flooring 70 compared to when a conventional underfloor space is formed using metal support legs, joists, and floor beams. This makes it possible to reduce the step between the outside and the inside of the room (where the flooring is located) compared to conventional methods, and the excavation depth in ground work becomes shallower, reducing the process and costs.

[0040] Similarly, when providing a floor structure on an intermediate floor of a building, the distance between the upper surface of the concrete 30 and the underside of the floor material 70 can be narrowed, so that the building height of that floor can be made shallower and construction of a double floor portion is unnecessary, thereby reducing the process and costs.

[0041] (4) The hollow structure 50 can be fixed to the upper surface of the concrete 30 with an adhesive 40, and the floor material 70 can be further fixed with an adhesive 60. Since the construction can be carried out using an adhesive technique, the number of steps and costs can be reduced.

[0042] (5) The hollow structure 50 is formed into a panel 50P of a fixed shape, which is lightweight and can be simply laid on the concrete 30 and bonded with the adhesive 40. This makes the installation work of the hollow structure 50 easy.

[0043] (6) By changing the impact absorption value of the hollow structure 50 and the flooring material 70, the hardness of the floor can be adjusted to suit the purpose of badminton, basketball, etc. In addition, the hardness of the floor can easily be made flexible to protect the body of children or elderly people in case of a fall.

[0044] (7) When a ball bounces, the reverberation caused by the drumming phenomenon that occurs with conventional double flooring can be reduced, and the reverberation caused when multiple players walk, run or jump during a sports competition can be reduced, making it easier to hear calls and coaching between players and improving the sense of realism of the competition.

[0045] (8) It is possible to reduce noise to the floors below even on the second or third floor, such as on a dance floor. (9) Unlike conventional double floors, there is no air gap that causes moisture, so there is no need for condensation or ventilation equipment. In addition, since wood is not used for the flooring, the flooring will not corrode, crack, or break. In addition, since metal such as metal supports is not used, there is no risk of rust.

[0046] (10) The floor structure of this embodiment is lighter than the conventional double floor, so the floor structure itself can be made lighter and the building strength can be reduced. In addition, even if the floor is replaced, the building itself does not need to be reinforced.

[0047] (11) Since the upper surface of the synthetic resin hollow structure 50 is smooth, the amount of adhesive used to adhere the flooring material can be reduced. (12) Conventional double flooring uses wooden flooring materials around the outermost periphery, and rubber plates were installed to prevent thermal expansion. However, since the floor structure of this embodiment uses synthetic resin flooring materials, it is not necessary to use rubber plates.

[0048] This embodiment can be modified as follows. The floor material 70 is not limited to the configuration of the above embodiment as long as it is made of synthetic resin. It is possible to use synthetic resin sheets, panels, etc. that are commercially available as gymnasium floor materials.

[0049] In the above embodiment, one piece of the first sheet material 100 is folded and molded to form the core layer 51 as a honeycomb structure in which the hexagonal cells S are partitioned inside the core layer 51, but the molding method is not limited to this. For example, as described in Japanese Patent No. 4368399, the core layer 51 as a honeycomb structure may be formed by sequentially folding a three-dimensional structure in which multiple rows of convex portions each having a trapezoidal cross section are provided.

[0050] In the above embodiment, the cells S are formed in a hexagonal column shape inside the core layer 51, but the shape of the cells S is not particularly limited, and may be, for example, a polygonal shape such as a square column shape or an octagonal column shape, or a cylindrical shape. The shape of the cells S may also be a truncated cone shape. In this case, cells of different shapes may be mixed. Furthermore, the cells do not have to be adjacent to each other, and there may be a gap (space) between the cells.

[0051] Hexagonal columnar cells S are partitioned and formed inside the core layer 51, but holes may be formed through the skin layer 52 to communicate with the upper wall portions 54 of the cells S. In this case, the hollow structure 50 can also exert a sound absorbing effect.

[0052] In the above embodiment, one layer of hollow structures 50 is arranged, but two or more layers of hollow structures 50 may be laminated. In this case, the laminated hollow structures 50 are also fixed to each other with an adhesive. The configuration of the hollow structure 50 is not limited to that in which columnar cells S are partitioned as in the above embodiment. For example, it may be that a skin layer is bonded to the upper or lower surface of a core layer having a predetermined uneven shape such as a cone shape or a column shape. An example of a hollow structure having such a configuration is described in JP 2014-205341 A. Also, it may be a plastic cardboard having a harmonica-shaped cross section.

[0053] In the above embodiment, the thermoplastic resin used for molding the hollow structure 50 may be one to which various functional resins have been added. For example, it is possible to increase flame retardancy by adding a flame-retardant resin to the thermoplastic resin. It is also possible to increase the specific gravity by mixing talc, inorganic materials, etc. It is also possible to use one to which various functional resins have been added for all of the core layer 51 and the skin layers 52 and 53, or to use one to which various functional resins have been added for at least one of the core layer 51 and the skin layers 52 and 53.

[0054] In the above embodiment, the skin layers 52, 53 may have a multi-layer structure. For example, the skin layers 52, 53 may have an adhesive layer with a relatively low melting temperature and a functional layer having additional functionality such as flame retardancy.

[0055] The floor structure of this embodiment can be used not only on the first floor but also on the second floor of a building. When using the floor structure on the second floor, the moisture-proof sheet 10 and the heat insulating material 20 may not be necessary. The panels 50P on the concrete 30 may be arranged in a lattice pattern.

[0056] -It can be used not only in gymnasiums, judo halls, kendo halls and fitness studios, but also in theaters, concert halls and other facilities used for music performances, movie viewing, etc. Specific examples will now be described.

[0057] Floor structure of the embodiment A panel 50P of the hollow structure 50 was fixed with a urethane adhesive 40 onto concrete 30 (thickness 14 cm) that had been made horizontal and smooth using a leveling material 32. Furthermore, a floor material 70 was fixed onto the hollow structure 50 with a urethane adhesive 60. The hollow structure 50 used was Texel (registered trademark) T5-1870 (thickness 5 mm) manufactured by Gifu Plastic Industry Co., Ltd., and had a length of 180 cm and a width of 90 cm. The thicknesses of the skin layers 52 and 53 of the hollow structure 50 were each 0.3 mm, and the core layer 51 was made of 80 mass % polypropylene and 20 mass % talc. The diameters of the cells S1 and S2 were approximately 5 to 10 mm.

[0058] The flooring used was a commercially available synthetic resin flooring material with a thickness of 5 mm, consisting of a urethane layer and a polyvinyl chloride layer laminated from the bottom. The panel 50P was placed on the concrete 30 in a broken joint pattern as shown in FIG. 2 and fixed with adhesive 40, and a floor material 70 was fixed on the panel 50P with adhesive 60.

[0059] Comparative example floor structure A conventional double floor structure was prepared as a comparative example. Metal support legs were installed at 90 cm intervals vertically and horizontally on the concrete 30 formed in the same manner as in the embodiment, and linear metal joists were placed in parallel on the support legs. In addition, linear metal joists were placed in parallel on the joists at 30 cm intervals in a direction perpendicular to the extension direction of the joists. Then, three layers of laminated plywood (12 cm, 12 cm, and 5 cm thick from the bottom) were placed on the joists as a base material. The same synthetic resin sheet as used in the embodiment was fixed on top of it with an adhesive as a floor material.

[0060] Shock absorption (JIS A6519 Floor hardness test method) For the examples and comparative examples, a test for measuring impact absorption was carried out at multiple locations of the flooring material, and the impact absorption value (G value) was measured.

[0061] First, for the examples, the impact absorption value (G value) was measured five times at each of the following three locations (locations A to C), and the average value was taken as the measured value at each location: the center of the panel 50P placed underneath the flooring material (location A in Fig. 2; the flooring material is not shown in Fig. 2), the intersection of the short and long sides of the panel 50P (location B in Fig. 2), and the joint between the short and short sides of the panel 50P (location C in Fig. 2).

[0062] For the comparative example, the impact absorption value (G value) was measured five times for each of the following four locations (locations a to d), and the average was taken as the measured value for each location: For the flooring material, the location directly above the support leg and where the slats and joists intersect (location a), the location not directly above the support leg and where the slats and joists intersect (location b), the location not directly above the support leg but where the slats are located but no joists are present (location c), and the location not directly above the support leg but where there are no slats or joists (location d). The measurement results for the examples and comparative examples are shown in Table 1 below.

[0063] [Table 1]

[0064] Thus, in the floor structure of the comparative example using conventional support legs, joists, and floor joists, the impact absorption value also differed greatly in places where the structure (support legs, joists, and floor joists) below the floor material was different, with the maximum difference being 25 (69-44). On the other hand, in the example using the hollow structural panel 50P, the difference in impact absorption value was small even in the center or joint of the panel 50P, with a maximum of 3 (90-87). It is preferable that the impact absorption value has little difference depending on the location, and the difference should be in the range of 1 to 10, and preferably in the range of 1 to 5.

[0065] Ball rebound The bottom part of a basketball was dropped from a height of 180 cm under its own weight, and the height at which it bounced back after hitting the floor (rebound amount) was measured. This test method was performed in accordance with the European standard EN-12235.

[0066] For each position of the above examples and comparative examples, the bottom part of the basketball was dropped by its own weight from a height of 180 cm based on the floor material, and the height at which it bounced off the floor material below was measured five times, and the average value was taken as the measurement value at each position. The measurement results for the examples and comparative examples are shown in Table 2 below.

[0067] [Table 2]

[0068] Thus, in the floor structure of the comparative example, the rebound amount also differed greatly in places where the structure (support legs, joists, and floor joists) below the floor material was different, with the maximum difference being 19 (118-99). On the other hand, in the example, the difference in the rebound amount was small even in different places, such as the center of the panel 50P and the joint position, with the maximum difference being 1 (123-122). It is preferable that the difference in the rebound amount from place to place is small, and it is sufficient if the difference is in the range of 1 to 5, and preferably the difference is in the range of 1 to 3.

[0069] Indoor noise (JIS A1418-2 Measurement method for floor impact sound insulation performance of buildings) A vibration device (bang machine RION FI-02) was installed at positions a and b on the floor material of the example and the floor material of the comparative example.

[0070] Additionally, microphones were installed at five locations 1.2 m above the floor. The distances of the microphones from the vibration device were as follows. First, two microphones were installed on a concentric circle with a radius of 2 m centered on the vibration device, with the straight-line distance between both microphones being 4 m. Another microphone was installed at a distance of 6 m from the vibration device. Furthermore, two microphones were installed on a concentric circle with a radius of 11 m centered on the vibration device, with the straight-line distance between both microphones being 4 m.

[0071] The flooring was vibrated by a vibration device at one location in the example and two locations in the comparative example, and the indoor sound pressure (dB(A)) at a specific center frequency (Hz) was measured with microphones at five locations. The specific center frequencies (Hz) are seven different frequencies from 63 to 4k shown in Table 3. Specifically, the indoor sound pressure at the specific center frequency obtained by vibration was measured with microphones at five locations, and the average value of the five locations was taken as the indoor sound pressure (dB(A)) at the time of vibration at each center frequency. The measurement results are shown in Table 3. The indoor noise should be 80dB(A) or less, and preferably 75dB(A) or less, at frequencies from 63 to 4kHz.

[0072] [Table 3]

[0073] As shown in Table 3, in the frequency range of measurement, the maximum indoor sound pressure was 87.3 dB(A) at 63 Hz in the comparative example, while the maximum value in the example was 74.7 dB(A) at the same frequency.

[0074] The indoor sound pressure when the floor material of the example was vibrated was about 10 dB(A) lower in the 63 to 250 Hz band than the floor material of the comparative example. When a sporting event is being held in a gymnasium, and multiple sounds such as cheering from spectators are mixed together, the difference of 10 dB(A) is significant.

[0075] Vibration acceleration (JIS A1418-2 Measurement method for floor impact sound insulation performance of buildings) Furthermore, a vibration accelerometer (RION VM-53) was placed on the floor material 1 m away from the vibration position of the vibration device, and a data recorder (RION DA-20) was connected to it. The floor material was vibrated at positions a and b in the example and comparative example by the vibration device, and the vibration acceleration (cm / s2) in the vertical direction of the floor material was measured by the vibration accelerometer. The same vibration and measurement were repeated three times in total to determine the maximum vibration acceleration measured, and the displacement (mm) was calculated from the measured vibration acceleration. The measurement results are shown in Table 4.

[0076] [Table 4]

[0077] As shown in Table 4, the vibration acceleration of the embodiment (18.3) was about 1 / 60 to 1 / 100 of the comparative examples (1092.1 and 2277.1). The comparative examples had large amplitude movements and large displacements, while the embodiments had small amplitude movements and small displacements.

[0078] The technical concept is described below. (1) A floor structure characterized by having a hollow structure on the concrete of a building and having a synthetic resin floor material on the hollow structure.

[0079] (2) The floor structure described in technical idea (1) is characterized in that the concrete contains a leveling material. (3) A floor structure according to technical idea (1) or (2), characterized in that a heat insulating material and / or a moisture-proof sheet is provided under the concrete.

[0080] (4) A floor structure described in any one of technical ideas (1) to (3), characterized in that the hollow structure is formed as a rectangular panel when viewed in a plane, and each panel is arranged in the form of a broken joint on the concrete.

[0081] (5) A floor structure described in any one of technical ideas (1) to (4), characterized in that the combined thickness of the hollow structure and the floor material is thinner than the thickness of the concrete. [Explanation of symbols]

[0082] 10... Moisture-proof sheet 20…Insulation material 30…Concrete 31…Concrete floor 32...Leveling material 40…Glue 50...Hollow structure 50P…Hollow structural panel 60…Adhesive 70…Flooring

Claims

1. A floor structure comprising a hollow structure on the concrete of a building and a synthetic resin floor material on the hollow structure, The concrete includes a leveling material, The hollow structure is formed as a rectangular panel in a plan view, and each panel is arranged on the concrete in a broken joint shape, each panel is fixed onto the concrete by an adhesive, and the flooring is fixed onto the panels by an adhesive; The floor structure has an impact absorption value (G value) according to JIS A6519 floor hardness testing method, and the difference between the maximum and minimum average values ​​at each of the positions is 1 to 10, where position A is the center of one panel arranged in the form of the break, position B is the position where the short side of the panel arranged in the form of the break and the long side of another panel intersect, and position C is the joint between the short side of the panel arranged in the form of the break and the short side of another panel, The floor structure is characterized in that the rebound amount, which is the height when the bottom part of a basketball according to EN-12235 is dropped under its own weight from a height of 180 cm and bounces back after hitting the surface of the floor material, has a difference between the maximum and minimum average values ​​at each of positions A, B, and C of 1 to 5 cm.

2. The floor structure according to claim 1, characterized in that the maximum average value of the indoor sound pressure at each frequency when the center frequency (Hz) according to JIS A1418-2, a measurement method for floor impact sound insulation performance of buildings, is excited at each of the frequencies of 63, 125, 250, 500, 1k, 2k, and 4k is 80 dB (A) or less.

3. 3. The floor structure according to claim 1, further comprising a heat insulating material and / or a moisture-proof sheet under the concrete.

4. 4. The floor structure according to claim 1, wherein a combined thickness of the hollow structure and the floor material is thinner than a thickness of the concrete.

5. The floor structure according to any one of claims 1 to 4, characterized in that the compressive strength of the panel is 0.5 to 5 MPa.

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