Floor substructure and floor structure

Abstract

To improve the insulation performance of the floor substructure and floor structure.SOLUTION: A floor substructure 43 laid on a concrete slab 2 has a plurality of insulation panels 44 and a plurality of reinforcing mortars 45 provided between the concrete slab and the insulation panels to adjust the level of the insulation panels. The insulation panels are arranged in a plurality of rows in each of two mutually intersecting directions on a plane. The reinforcing mortars extend in a closed loop along the outer edge of each insulation panel.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a floor substructure that is laid on a concrete slab, and to a floor structure having a concrete slab and a floor substructure. [Background technology]

[0002] Conventionally, in the case of direct floors, the level of the floor may be adjusted by placing a plurality of mortar balls or a plurality of reinforcing mortar pieces between the floor material and the concrete slab (Patent Document 1).

[0003] In multi-story reinforced concrete buildings, in order to ensure energy-saving performance, insulation reinforcement is applied to the exterior wall parts that are in contact with the outside air and form a thermal bridge, and to the floor slabs that are connected to the exterior wall parts. Specifically, floor panels having an insulation layer and a finishing layer are laid on top of the concrete slab (Patent Document 2). In floor level adjustment, generally, for floor panels near the exterior wall parts, a reinforcement mortar method is applied in which reinforcement mortar is placed on the concrete slab along the outer edge of the floor panel material, and for other floor panels, a mortar dumpling method is applied in which mortar dumplings are placed on the concrete slab.

[0004] In recent years, ZEH-M (Net Zero Energy House Manshon), which can reduce the energy used in collective housing such as rental houses and condominiums, has been attracting attention (Non-Patent Document 1). For this reason, in order to suppress thermal bridges and heat radiation between the dwelling units on the upper and lower floors, insulation material is sprayed onto the underside of the concrete slab (the ceiling side of the dwelling unit on the lower floor). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2002-13283 A [Patent Document 2] JP 2020-153121 A [Non-patent literature]

[0006] [Non-Patent Document 1] Agency for Natural Resources and Energy, "Summary of the Committee to Review the ZEH Roadmap for Apartment Buildings" (May 2018) Summary of the Invention [Problem to be solved by the invention]

[0007] The reinforcing mortar is arranged to extend along the circumferential direction of each rectangular plate-shaped insulation panel. Therefore, the space surrounded by the concrete slab, the insulation panel, and the reinforcing mortar is closed. Meanwhile, the multiple mortar balls are arranged at a predetermined interval in the long axis direction and the short axis direction of the insulation panel. When the insulation panel is laid by arranging the mortar balls, a gap is formed between each mortar ball. The spaces formed between the concrete slab and each insulation panel are connected to each other through the gaps between the multiple mortar balls, so that heat is easily transmitted in the horizontal direction. In other words, the insulation performance of a floor leveled by the mortar balls is smaller than that of a floor leveled by the reinforcing mortar.

[0008] The inventors of the present application have come up with the idea that by improving the insulation performance compared to a floor leveled using mortar dumplings, it is possible to eliminate or reduce the need to spray insulation material onto the underside of the concrete slab, thereby improving workability.

[0009] In view of the above background, an object of the present invention is to improve the workability of a floor substructure and a floor structure, or to improve the thermal insulation performance of a floor substructure and a floor structure. [Means for solving the problem]

[0010] In order to solve the above problems, the present invention provides a floor underlay structure (43) laid on a concrete slab (2), comprising a plurality of insulation panels (44) arranged in multiple rows in each of two intersecting directions on a plane, and a plurality of reinforcing mortar pieces (45) provided between the concrete slab and the insulation panels and extending in a closed ring shape along the outer edges of each of the insulation panels in order to adjust the level of the insulation panels.

[0011] According to this embodiment, the horizontal heat transfer in the space between the insulation panel and the concrete slab is restricted by the reinforcing mortar, so that all the insulation panels have high insulation properties, thereby improving the insulation performance of the floor base structure.

[0012] In the above aspect, the heat insulating panels may be arranged in three or more rows in each of the two directions.

[0013] According to this aspect, the installed insulation panels include an insulation panel surrounded by other insulation panels. By providing the insulation panels surrounded by insulation panels with reinforcement mortar, the spaces surrounded by the insulation panels, reinforcement mortar, and concrete slabs are divided. Therefore, the horizontal transfer of heat in each space is more effectively suppressed.

[0014] In the above aspect, it is preferable that the insulation panel further include a plurality of mortar mortar balls (46) provided between the concrete slab and at least some of the insulation panels and positioned inside the corresponding reinforcing mortar.

[0015] According to this embodiment, the insulation panel is stably placed on the concrete slab.

[0016] In order to solve the above problems, the present invention provides a floor structure (41) comprising a concrete slab (2), a floor underlay structure (43) of the above-mentioned aspect that is laid on the concrete slab, and insulation material (48) sprayed onto the upper surface of the concrete slab, wherein the concrete slab has a first upper surface (2A), a second upper surface (2B) that is lower than the first upper surface, and a stepped upper surface (2C) that extends in the vertical direction and connects the first upper surface and the second upper surface, and the floor underlay structure is arranged on the first upper surface, and the insulation material is arranged on the stepped upper surface and the second upper surface.

[0017] According to this aspect, in plan view, the insulating panels or insulating material are continuously provided on the upper surface of the concrete slab over the entire surface of the floor. This improves the insulating performance of the floor structure. This eliminates the need to spray insulating material onto the underside of the concrete slab as in the past. This improves the workability of the floor structure. Alternatively, when insulating material is sprayed onto the underside of the concrete slab as in the past, the insulating performance of the floor structure is remarkably improved.

[0018] In order to solve the above problems, the present invention provides a floor structure (41) comprising a concrete slab (2), a floor underlay structure (43) of the above-mentioned aspect that is laid on the concrete slab, and an insulating material (48) sprayed onto the underside of the concrete slab, wherein the concrete slab has a first upper surface (2A), a second upper surface (2B) lower than the first upper surface, a stepped upper surface (2C) extending in the vertical direction and connecting the first upper surface and the second upper surface, a first lower surface (2D) located below the first upper surface, a second lower surface (2E) located below the second upper surface, lower than the first lower surface and wider than the second upper surface, and a stepped lower surface (2F) extending in the vertical direction and connecting the first lower surface and the second lower surface, and the floor underlay structure is arranged on the first upper surface, and the insulating material is arranged on the stepped lower surface and the second lower surface.

[0019] According to this aspect, the insulating panel on the upper surface of the concrete slab and the insulating material on the lower surface of the concrete slab are arranged so as to overlap over the entire surface of the floor in plan view. This improves the insulating performance of the floor structure. This eliminates the need to spray insulating material over the entire surface of the lower surface of the concrete slab as in the past. This improves the workability of the floor structure. Alternatively, when insulating material is sprayed over the entire surface of the lower surface of the concrete slab as in the past, the insulating performance of the floor structure is significantly improved.

[0020] In order to solve the above problems, the present invention provides a floor structure (41) comprising a concrete slab (2) and the above-mentioned floor underlay structure (43) laid on the concrete slab, the concrete slab having a first upper surface (2A), a second upper surface (2B) lower than the first upper surface, and a stepped upper surface (2C) extending in the vertical direction and connecting the first upper surface and the second upper surface, the floor underlay structure being arranged on the first upper surface, and the insulation panel being arranged on the stepped upper surface and the second upper surface.

[0021] According to this aspect, in plan view, the insulation panel of the floor underlay structure is placed on the upper surface of the concrete slab over the entire surface of the concrete slab. This improves the insulation performance of the floor structure. This eliminates the need to spray insulation material over the entire surface of the underside of the concrete slab as in the past. This improves the workability of the floor structure. Alternatively, when insulation material is sprayed over the underside of the concrete slab as in the past, the insulation performance of the floor structure is significantly improved. Effect of the Invention

[0022] The present invention can improve the workability of the subfloor structure and the floor structure, or can improve the thermal insulation performance of the subfloor structure and the floor structure. [Brief description of the drawings]

[0023] [Figure 1] A side cross-sectional view of a building having a floor underlay structure according to this embodiment. [Diagram 2] Plan view of a building having a floor underlay structure according to this embodiment. [Diagram 3] FIG. 1 is a plan view showing a floor underlay structure according to an embodiment of the present invention; [Figure 4] FIG. 1 is a side cross-sectional view showing a floor underlay structure according to an embodiment of the present invention. [Diagram 5] Side cross-sectional view of the building according to the first embodiment [Figure 6] Plan view of the building according to the first embodiment [Figure 7] Side cross-sectional view of the building according to the second embodiment [Figure 8] Plan view of the building according to the second embodiment [Figure 9] Plan view of the building according to the third embodiment [Figure 10] Plan view of the building according to the third embodiment DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] Hereinafter, several embodiments of the present invention will be described in detail with reference to the drawings. In the following embodiments, a concrete building 1 used as an apartment building will be described as an example. Here, concrete construction means that the building 1 is a structure containing concrete, and includes a concrete slab 2 and an exterior wall 3. The structure containing concrete may be, for example, reinforced concrete construction, steel-reinforced concrete construction, fiber-reinforced concrete construction, etc.

[0025] (First embodiment) As shown in Figures 1 and 2, the building 1 is a multi-story building having multiple floors defined by a concrete slab 2, and separate dwelling units 7 are provided on each of the floors above and below the concrete slab 2. Multiple dwelling units 7 are provided on the same floor, and adjacent dwelling units 7 are separated from each other by a concrete partition wall 8.

[0026] The concrete slab 2 has projections 9 that project outward from each of the two exterior walls 3 that are perpendicular to the partition wall 8. One projection 9 forms a balcony 10, and the other projection 9 forms a passageway 11 that connects each of the dwelling units 7 provided on the same floor.

[0027] Each of the two exterior walls 3 of each dwelling unit 7 has a plurality of openings that communicate between the outside and the inside of the building 1. Each of the plurality of openings has a corresponding window 21, 23 or entrance door 22 that covers the opening. In this embodiment, one opening is provided in the exterior wall 3 on the balcony 10 side, and this opening is provided with a balcony side window 21. Three openings are provided in the exterior wall 3 on the passage 11 side. Of the openings provided in the exterior wall 3 on the passage 11 side, one opening is provided with an entrance door 22, and the remaining two openings are each provided with a passage side window 23.

[0028] Wall panels 24 are arranged at intervals from each wall on the inside of the exterior wall 3 and on the dwelling unit 7 side of the partition wall 8. Ceiling panels 26 are provided at intervals below the concrete slab 2 of the upper floor, forming a ceiling 27 of the dwelling unit 7. Floor panels 29 are provided on the concrete slab 2 of that floor, forming a floor 30 of the dwelling unit 7. A living space is defined inside the dwelling unit 7 by the wall panels 24, ceiling panels 26, and floor panels 29.

[0029] 2, the dwelling unit 7 is provided with partition walls 31 to separate the living space into a plurality of rooms, etc. In this embodiment, the dwelling unit 7 has a living room 32, a first room 33, a second room 34, a third room 35, a kitchen 36, a dressing room 37, a bathroom 38, and a toilet 39, etc. The dressing room 37, the bathroom 38, and the toilet 39 are provided adjacent to each other.

[0030] As also shown in FIG. 1, the concrete slab 2 located below the dressing room 37, bathroom 38, and toilet 39 is set lower than the concrete slab 2 located below the other rooms. That is, the concrete slab 2 has a first upper surface 2A, a second upper surface 2B that is lower than the first upper surface 2A, and a stepped upper surface 2C that extends in the vertical direction and connects the first upper surface 2A and the second upper surface 2B. Rooms other than the dressing room 37, bathroom 38, and toilet 39 are provided above the first upper surface 2A. The dressing room 37, bathroom 38, and toilet 39 are provided above the second upper surface 2B and the stepped upper surface 2C. A space is defined below the dressing room 37, bathroom 38, and toilet 39 by the second upper surface 2B and the stepped upper surface 2C. A drain pipe, etc. (not shown) is arranged in this space. The concrete slab 2 also has a first lower surface 2D located below the first upper surface 2A, a second lower surface 2E located below the second upper surface 2B, lower than the first lower surface 2D and wider than the second upper surface 2B, and a step lower surface 2F extending in the vertical direction and connecting the first lower surface 2D and the second lower surface 2E.

[0031] The floor panels 29 provided on the concrete slab 2 may be formed in the shape of panels made of, for example, wooden flooring material. The floor structure 41 forming the floors 30 of the rooms other than the washroom / dressing room 37, the bathroom 38, and the toilet 39 is formed by a so-called direct floor in which the floor panels 29 are placed on the first upper surface 2A of the concrete slab 2. Specifically, the floor panels 29 are placed on a floor base structure 43 laid on the concrete slab 2.

[0032] The floor structure 41 of the dressing room 37, bathroom 38, and toilet 39 is a so-called double floor in which the floor panel 29 is supported on a plurality of support legs 47 arranged vertically on the second upper surface 2B of the concrete slab 2. The plurality of support legs 47 adjust the level of the floor 30 of the dressing room 37, bathroom 38, and toilet 39 to be equal to the level of the floor 30 of the other rooms.

[0033] As shown in Figs. 3 and 4, the floor base structure 43 has a plurality of insulating panels 44. The insulating panels 44 are formed in the shape of rectangular panels in a plan view, with an insulating layer formed of an insulating material such as extruded polystyrene foam, beaded polystyrene foam, polyethylene foam, urethane foam, or phenol foam. The dimensions of the insulating panels 44 are preferably such that the insulating panels 44 are arranged in multiple rows or more, more specifically, in three rows or more, in each of two directions (vertical and horizontal directions) that intersect with each other on the first upper surface 2A of the concrete slab 2. In other words, the insulating panels 44 to be arranged include insulating panels 44 that are surrounded by insulating panels 44. With such an arrangement, two or more insulating panels 44 of different dimensions may be arranged.

[0034] The floor base structure 43 is provided between the concrete slab 2 and the insulation panels 44, and further includes a plurality of reinforcing mortar pieces 45 extending in a closed ring shape along the outer edges of the insulation panels 44, and a plurality of mortar balls 46 arranged inside the corresponding reinforcing mortar pieces 45. The mortar balls 46 do not need to be provided on all the insulation panels 44 to be arranged, and may be arranged as appropriate in consideration of the dimensions of the insulation panels 44, etc.

[0035] Each of the plurality of streaky mortars 45 and the plurality of mortar dumplings 46 is a mixture containing cement, sand, water, etc. The streaky mortar 45 is formed in a streaky shape, and the mortar dumplings 46 are formed in a spherical shape.

[0036] For the floors 30 of the rooms other than the dressing room 37, the bathroom 38, and the toilet 39, first, a plurality of reinforcing mortars 45 and a plurality of mortar dumplings 46 are placed on the concrete slab 2, and then each of the insulating panels 44 is placed. Then, each of the insulating panels 44 is pressed downward, so that the plurality of reinforcing mortars 45 and the plurality of mortar dumplings 46 are deformed. This adjusts the level of each of the insulating panels 44. That is, the floor base structure 43 is provided on the concrete slab 2. The floor panel 29 is provided on the floor base structure 43, so that the floors 30 of the rooms other than the dressing room 37, the bathroom 38, and the toilet 39 are formed. The plurality of mortar dumplings 46 are provided inside the reinforcing mortar 45, so that the insulating panels 44 are stably placed on the concrete slab 2.

[0037] As shown in Figures 5 and 6, the floor structure 41 of the floor 30 formed by the floor base structure 43 including the insulating panel 44 constitutes the floor 30 of the rooms other than the washroom 37, the bathroom 38, and the toilet 39. In Figure 5, the part having this floor structure 41 is shown by a thick solid line. In Figure 6, the part having this floor structure 41 is shown by light hatching.

[0038] Since the reinforcing mortar 45 is arranged in a closed ring around the outer edge of each insulation panel 44, the space between the insulation panel 44 and the concrete slab 2 is closed by the reinforcing mortar 45 for each insulation panel 44. As a result, the horizontal transfer of heat in the space between the insulation panel 44 and the concrete slab 2 is restricted by the reinforcing mortar 45, so that all the insulation panels 44 have high insulation properties. This improves the insulation performance of the floor base structure 43. Therefore, when designing or evaluating the insulation performance of the dwelling unit 7, the insulation panels 44, which were not previously treated as insulation materials, can be treated as floor insulation materials. In other words, the insulation performance of the insulation panels 44 can be included in the calculation of the insulation performance of the dwelling unit 7.

[0039] Heat insulating material 48 is sprayed onto the upper surface of the concrete slab 2 located below the dressing room 37, bathroom 38, and toilet 39, i.e., the second upper surface 2B and the step upper surface 2C. The heat insulating material 48 is made of urethane foam or the like, and is sprayed on-site. In Fig. 5, the areas where the heat insulating material 48 is sprayed are indicated by thick dashed lines. In Fig. 6, the areas where the heat insulating material 48 is sprayed are indicated by thick hatching.

[0040] As a result, the floor structure 41 of the floor 30 of the dwelling unit 7 is provided so that the floor base structure 43 or the insulation material 48 is continuous on the upper surface of the concrete slab 2 across the entire surface of the floor 30 in a plan view. This improves the insulation performance of the floor structure 41. As a result, there is no need to spray the insulation material 48 on the underside of the concrete slab 2 as in the past. This improves the workability of the floor structure 41. Alternatively, when the insulation material 48 is sprayed on the underside of the concrete slab 2 as in the past, the insulation performance of the floor structure 41 is significantly improved.

[0041] A heat insulating material 48 is also sprayed onto the exterior wall 3 on which the balcony side window 21 and the multiple passage side windows 23 are provided. Specifically, the heat insulating material 48 is sprayed onto the periphery of the exterior wall 3 that defines each opening, and onto the underside of the concrete slab 2, on portions that are located near the exterior wall 3. In Figs. 5 and 6, the portions onto which the heat insulating material 48 is sprayed are indicated by thick dashed lines. After the heat insulating material 48 is sprayed, the wall panel 24 is installed. The heat insulating material 48 sprayed onto the exterior wall 3 may be the same as the heat insulating material 48 used to spray onto the second upper surface 2B and the step upper surface 2C of the concrete slab 2, and may be appropriately selected as necessary.

[0042] As shown in Figs. 5 and 6, the outside of the exterior wall 3 and the overhanging portion 9 of the concrete slab 2 are in contact with the outside air. Therefore, the exterior wall 3 and the concrete slab 2 form a thermal bridge that transfers the heat of the outside air to the dwelling unit 7. The floor underlay structure 43 and the heat insulating material 48 suppress the amount of heat of the outside air transferred to the dwelling unit 7 through the thermal bridge. That is, the heat insulating material 48 sprayed on the exterior wall 3 suppresses the amount of heat of the outside air transferred to the dwelling unit 7 through the exterior wall 3. The heat insulating material 48 sprayed on the lower surface of the concrete slab 2 that forms the ceiling 27 side, which is located near the exterior wall 3, suppresses the amount of heat of the outside air transferred to the dwelling unit 7 through the concrete slab 2. The floor underlay structure 43 provided on the portion of the first upper surface 2A of the concrete slab 2 that forms the floor 30 side, which is located near the exterior wall 3, suppresses the amount of heat of the outside air transferred to the dwelling unit 7 through the concrete slab 2.

[0043] The concrete slab 2 forming the floor 30 side forms a thermal bridge that transfers heat from the dwelling unit 7 on the lower floor to the dwelling unit 7 on the same floor. The floor underlay structure 43 provided on the first upper surface 2A of the concrete slab 2 forming the floor 30 side, in a portion other than the vicinity of the exterior wall 3, suppresses the amount of heat from the dwelling unit 7 on the lower floor that is transferred to the dwelling unit 7 via the concrete slab 2. Similarly, the insulation material 48 provided on the second upper surface 2B and the step upper surface 2C of the concrete slab 2 also suppresses the amount of heat from the dwelling unit 7 on the lower floor that is transferred to the dwelling unit 7 via the concrete slab 2.

[0044] The floor structure 41 of the floor 30 of the dwelling unit 7 is provided so that the floor base structure 43 or the heat insulating material 48 is continuous on the upper surface of the concrete slab 2 over the entire surface of the floor 30 in a plan view. This reduces the amount of heat from the outside air transferred to the dwelling unit 7 on the floor in question and the amount of heat from the dwelling unit 7 on the floor below. This improves the insulation performance of the floor structure 41.

[0045] The insulation panels 44 are arranged in three or more rows in each of two mutually intersecting directions (vertical and horizontal directions) on the first upper surface 2A of the concrete slab 2. That is, the arranged insulation panels 44 include insulation panels 44 that are surrounded by other insulation panels 44. By providing reinforcing mortar 45 on the insulation panels 44 that are surrounded by insulation panels 44, the spaces surrounded by each insulation panel 44, the reinforcing mortar 45, and the concrete slab 2 are subdivided. Therefore, the horizontal transfer of heat in each space is more effectively suppressed.

[0046] Second embodiment The floor structure 41 in the second embodiment is different from the floor structure 41 in the first embodiment in the location of the insulation material 48 sprayed onto the concrete slab 2. The same components as those in the floor structure 41 in the first embodiment are denoted by the same reference numerals and will not be described.

[0047] As shown in Figures 7 and 8, the insulating material 48 is sprayed onto the underside of the concrete slab 2. That is, the insulating material 48 is provided on the underside of the concrete slab 2 forming the ceiling side, more specifically, on the second underside 2E and the step underside 2F. In Figure 7, the part where the insulating material 48 is sprayed is indicated by a thick dashed line. In Figure 8, the part of the underside of the concrete slab 2 where the insulating material 48 is sprayed corresponds to the part surrounded by the thick dashed line. After the insulating material 48 is sprayed onto the second underside 2E and the step underside 2F, the ceiling 27 is formed by arranging the ceiling panel 26.

[0048] The second lower surface 2E is located below the second upper surface 2B, is lower than the first lower surface 2D, and is wider than the second upper surface 2B. As a result, in a plan view, the floor underlay structure 43 on the upper surface of the concrete slab 2 and the insulating material 48 on the lower surface of the concrete slab 2 are arranged to overlap over the entire surface of the floor 30. This suppresses the transfer of heat to the dwelling unit 7 on the lower floor. Therefore, the insulating performance of the floor structure 41 is improved.

[0049] Since the heat insulating material 48 is provided on the second lower surface 2E and the step lower surface 2F, it is necessary to spray the heat insulating material 48 onto the lower surface of the concrete slab 2, but it is not necessary to spray the heat insulating material 48 onto the entire surface of the lower surface of the concrete slab 2 as in the conventional method. This improves the workability of the floor structure 41. Alternatively, when the heat insulating material 48 is sprayed onto the entire surface of the lower surface of the concrete slab 2 as in the conventional method, the heat insulating property of the floor structure 41 is significantly improved.

[0050] Third embodiment The floor structure 41 in the third embodiment differs from the floor structure 41 in the first embodiment only in that the floor structure 41 is provided on the second upper surface 2B and the step upper surface 2C. The same components as those in the first embodiment are denoted by the same reference numerals and will not be described.

[0051] As shown in Figures 9 and 10, a plurality of insulation panels 44 having a thermal insulation layer are arranged on the second upper surface 2B and the step upper surface 2C of the concrete slab 2. The insulation panels 44 are the same as the insulation panels 44 of the floor underlayment structure 43 provided on the first upper surface 2A of the concrete slab 2. In Figure 9, the portion having the insulation panels 44 is indicated by a thick solid line. In Figure 10, the portion having the insulation panels 44 is indicated by light hatching.

[0052] The level of the floor 30 of the washroom / dressing room 37, bathroom 38, and toilet 39, which are provided above the second upper surface 2B of the concrete slab 2 and formed by a double floor, is adjusted by a plurality of support legs 47. Therefore, the insulation panel 44 placed on the second upper surface 2B and the step upper surface 2C of the concrete slab 2 does not need to have corresponding reinforcing mortar 45 and a plurality of mortar balls 46 placed thereon. In this case, the insulation panel 44 may be adhered to the second upper surface 2B and the step upper surface 2C of the concrete slab 2 by an appropriate adhesive or the like.

[0053] The floor structure 41 of the floor 30 of the dwelling unit 7 is provided so that the floor underlay structure 43 or the insulating panel 44 of the floor underlay structure 43 is continuous with the upper surface of the concrete slab 2 over the entire surface of the floor 30 in a plan view. This improves the insulating performance of the floor structure 41. This eliminates the need to spray insulating material 48 over the entire surface of the underside of the concrete slab 2 as in the past. This improves the workability of the floor structure 41. Alternatively, when the insulating material 48 is sprayed onto the underside of the concrete slab 2 as in the past, the insulating performance of the floor structure 41 is significantly improved.

[0054] Although the description of the specific embodiments is finished above, the present invention is not limited to the above-mentioned embodiments and modified examples, and can be widely modified and implemented. In each embodiment, the floor understructure 43 is provided on the upper surface of the concrete slab 2 that defines the upper floor and the lower floor, but it may be provided on the upper surface of the flat slab that forms the first floor of the building 1. The heat insulating panel 44 may be, for example, a heat insulating material 48 formed from fibers such as glass wool, rock wool, and cellulose fiber. The floor understructure 43 may have a sound insulating layer that is provided on the upper or lower surface of the heat insulating panel 44 and has sound insulating properties. The floor understructure 43 may also have a joining layer that is provided on the upper surface of the heat insulating panel 44 and is for joining to the floor panel 29. The specific configuration, arrangement, quantity, material, etc. of each member and part can be appropriately changed as long as it does not deviate from the gist of the present invention. In addition, all of the components shown in the above embodiments are not essential and can be selected appropriately. [Explanation of symbols]

[0055] 2: Concrete slab 2A: 1st top surface 2B: 2nd top surface 2C: Top of step 2D: 1st bottom surface 2E: 2nd bottom surface 2F: Bottom of step 41: Floor structure 43: Floor substructure 44: Insulation panel 45: Muscle mortar 46: Mortar Dumpling

Claims

1. A floor substructure laid on a concrete slab, A plurality of insulating panels arranged in a plurality of rows in each of two directions intersecting each other on a plane; A floor underlayment structure having a plurality of reinforcement mortar members disposed between the concrete slab and the insulation panels and extending in a closed ring shape along the outer edges of each of the insulation panels to adjust the level of the insulation panels.

2. The floor underlay structure according to claim 1 , wherein the insulation panels are arranged in three or more rows in each of the two directions.

3. The floor underlayment structure according to claim 1 , further comprising a plurality of mortar mortar balls disposed between the concrete slab and at least some of the insulation panels and inside the corresponding reinforcing mortar.

4. A floor structure comprising: Concrete slab and The floor underlay structure according to any one of claims 1 to 3, which is laid on the concrete slab; and a thermal insulation material sprayed onto the upper surface of the concrete slab; The concrete slab is A first top surface; A second upper surface that is lower than the first upper surface; a stepped upper surface extending in a vertical direction and connecting the first upper surface and the second upper surface; The floor underlay structure is disposed on the first upper surface, A floor structure in which the insulation material is arranged on the step upper surface and the second upper surface.

5. A floor structure comprising: Concrete slab and The floor underlay structure according to any one of claims 1 to 3, which is laid on the concrete slab; and a heat insulating material sprayed onto the underside of the concrete slab; The concrete slab is A first top surface; A second upper surface that is lower than the first upper surface; a stepped upper surface extending in the vertical direction and connecting the first upper surface and the second upper surface; a first lower surface located below the first upper surface; a second lower surface located below the second upper surface, lower than the first lower surface, and wider than the second upper surface; a stepped lower surface extending in a vertical direction and connecting the first lower surface and the second lower surface; The floor underlay structure is disposed on the first upper surface, A floor structure in which the insulation material is arranged on the step lower surface and the second lower surface.

6. A floor structure comprising: Concrete slab and The floor underlay structure according to any one of claims 1 to 3 is laid on the concrete slab, The concrete slab is A first top surface; A second upper surface that is lower than the first upper surface; a stepped upper surface extending in a vertical direction and connecting the first upper surface and the second upper surface; The floor underlay structure is disposed on the first upper surface, The floor structure according to claim 1 , wherein the insulation panel is disposed on the step upper surface and the second upper surface.

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