Floor structure of building

Abstract

To exert sound insulation performance at the same level as a floor structure of a building of heavy weight steel-framed construction, in a floor structure of a building of light weight steel-framed construction.SOLUTION: A floor structure 1 of a building includes: a beam 10 which is light weight steel-frame; a vibration proof material 4 placed on the beam 10; a dry type floor slab 3 supported by the beam 10 via the vibration proof material 4; a floor surface material 20 placed on the dry type floor slab 3; a mounting metal fitting 5 mounted on the beam 10; a ceiling substrate material 30 supported by the beam via the mounting metal fitting 5; and a ceiling surface material 2 mounted on the ceiling substrate material 30. The thickness of the vibration proof material 4 is equal to or greater than 12.5 mm. A ceiling inner part H3 which is height between a lower surface 3c of the dry type floor slab 3 and an upper surface 2a of the ceiling surface material 2 is equal to or greater than 250 mm. Floor weight which is the total weight of the floor surface material 20 and the dry type floor slab 3 per unit area is equal to or greater than 140 kg / m2.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] Floor impact noise from the upper floors of a building is transmitted to the ceiling of the lower floor via the upper floor, and is excited and radiated to the lower floor. This floor impact noise includes heavy floor impact noise and light floor impact noise.

[0003] Conventional vibration-proof floor structures are formed, for example, by attaching band-shaped vibration-proof materials or piece-shaped vibration-proof materials at intervals to the upper surface of a steel beam (H-shaped steel, channel steel, etc.), and placing floor panels that form the floor of the upper floor on the vibration-proof materials (see, for example, Patent Document 1). These floor panels are dry floor panels (dry floors), and an example of this is an ALC (Autoclaved Light Weight Concrete) floor panel (ALC panel). For example, when the floor receives heavy floor impact sound, the elasticity of the vibration-proof materials on the steel beam reduces the heavy floor impact sound, thereby demonstrating sound insulation performance. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2019-7229 A Summary of the Invention [Problem to be solved by the invention]

[0005] The floor structure of a light steel frame building is required to have sound insulation performance equivalent to that of a heavy steel frame building.

[0006] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a floor structure of a building made of light steel frame that is capable of exhibiting sound insulation performance equivalent to that of a floor structure of a building made of heavy steel frame. [Means for solving the problem]

[0007] In order to achieve the above object, one aspect of the floor structure of a building according to the present invention is as follows: The beams are made of light steel. A vibration-isolating material placed on the beam; A dry deck supported by the beam via the vibration-proof material; A floor surface material placed on the dry deck; A mounting bracket attached to the beam; A ceiling base material supported on the beam via the mounting bracket; A ceiling surface material attached to the ceiling base material, The thickness of the vibration-proof material is 12.5mm or more, The ceiling recess, which is the height between the lower surface of the dry floor slab and the upper surface of the ceiling surface material, 250mm or more, The floor weight, which is the total weight of the floor surface material mat and the dry floor slab per unit area, is 140kg / m 2 The present invention is characterized in that:

[0008] According to this aspect, vibration isolating materials are placed on the beams and the dry deck is supported via the vibration isolating materials, so that the vibration of the dry deck can be attenuated. In this aspect, even if the ceiling space, which is the height between the lower surface of the dry deck and the upper surface of the ceiling surface material, is narrow, the sound insulation effect can be improved. In this aspect, the floor impact sound of the upper floor can be weakened in the floor structure of a light steel frame building, and sound insulation performance equivalent to that of the floor structure of a heavy steel frame building can be achieved.

[0009] In another aspect of the present invention, The beam has a web, an upper flange, and a lower flange; The vibration-isolating material is placed on the upper flange, A recess is formed at the end of the dry deck in the longitudinal direction, the recess being recessed upward from the lower surface of the dry deck, The upper flange of the beam and the vibration-damping material are arranged in the recess and are positioned above the lower surface of the dry deck.

[0010] According to this aspect, the upper flange of the beam can be placed within the recess of the dry deck, thereby increasing the ceiling height.

[0011] In another aspect of the present invention, The present invention is characterized in that it further comprises a vibration suppressing member arranged on the ceiling surface material.

[0012] According to this aspect, since the vibration damping member is disposed on the ceiling surface material, the vibration of the ceiling surface material can be suppressed. Therefore, in this aspect, the floor impact sound on the upper floors of the building can be weakened, and the sound insulation performance can be improved.

[0013] In another aspect of the present invention, The vibration suppressing member is An elastic portion disposed on an upper surface of the ceiling surface material; and a weight disposed on the elastic portion.

[0014] According to this aspect, the weight supported by the elastic portion moves up and down, thereby damping vibrations of the ceiling surface material, thereby reducing floor impact noise on the upper floor.

[0015] In another aspect of the present invention, The floor surface material is a floor surface material for an upper floor, A lower floor indoor space having a predetermined ceiling height is formed below the ceiling surface material, The ceiling height, which is the height from the floor surface of the lower floor to the underside of the ceiling surface material, 2100mm or more and 3500mm or less, The floor height, which is the height from the floor surface of the lower floor to the upper surface of the floor surface material of the upper floor, It is characterized by being greater than or equal to 2500mm and less than or equal to 5000mm.

[0016] According to this aspect, sound insulation performance can be improved, and the ceiling height can be maintained while ensuring sufficient floor height.

[0017] In another aspect of the present invention, The thickness of the vibration-proof material relative to the floor weight, which is the total weight of the floor surface material and the dry floor slab per unit area, is characterized by being 0.07 mm / kg or more.

[0018] According to this aspect, the floor weight per unit area can be made heavier than in the past, and the thickness of the vibration-proof material can be made thicker than in the past. Effect of the Invention

[0019] As can be understood from the above explanation, according to the present invention, it is possible to provide a floor structure of a building made of light steel frame that is capable of exhibiting sound insulation performance equivalent to that of a floor structure of a building made of heavy steel frame. [Brief description of the drawings]

[0020] [Figure 1] FIG. 2 is a cross-sectional view showing an example of a floor structure of a building according to one embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] Hereinafter, a floor structure of a building according to an embodiment will be described with reference to the accompanying drawings. In this specification and the drawings, substantially the same components are designated by the same reference numerals, and redundant description may be omitted.

[0022] [Floor structure 1 of the building according to the embodiment] An example of a floor structure of a building according to an embodiment will be described with reference to Fig. 1. Fig. 1 is a cross-sectional view showing an example of a floor structure 1 of a building according to an embodiment. In Fig. 1, arrows indicating an X-axis direction, a Y-axis direction, and a Z-axis direction are appropriately illustrated as three mutually perpendicular directions. The Y-axis direction is along the longitudinal direction of the beam 10. The X-axis direction is along the width direction intersecting with the longitudinal direction of the beam 10. The Z-axis direction is along the vertical direction.

[0023] The floor structure 1 of the building includes a beam 10, a floor 50, a mounting bracket 5, a ceiling underlayment material 30, a ceiling surface material 2, and a vibration suppression member 40. The floor 50 includes a dry floor slab 3 and a floor surface material 20.

[0024] [Beam 10] The floor structure 1 of a building has a floor 50 on an upper floor (e.g., the second or third floor) of the building, and a beam 10 supporting the floor 50. The beam 10 is formed of an H-shaped steel having a web 11, an upper flange 12, and a lower flange 13. The beam 10 is an example of a light-gauge steel frame. The light-gauge steel frame is manufactured from a steel material having a plate thickness of less than 6 mm, for example. The web 11, the upper flange 12, and the lower flange 13 are made of a steel material having a plate thickness of less than 6 mm.

[0025] [Vibration isolation material 4] The floor structure 1 includes a vibration-proof material 4 placed on a beam 10. The vibration-proof material 4 is disposed on an upper surface 12a of an upper flange 12 of the beam 10. The vibration-proof material 4 is disposed continuously along the longitudinal direction of the beam 10. The vibration-proof material 4 is, for example, in a band shape. The longitudinal direction of the vibration-proof material 4 is along the longitudinal direction of the beam 10. A pair of vibration-proof materials 4 are disposed apart from each other in the width direction of the beam 10. A gap is formed between a pair of vibration-proof materials 4 arranged in the width direction of the beam 10. The vibration-proof material 4 is formed of a viscoelastic material such as urethane foam (polyurethane), rubber, or elastomer. The vibration-proof material 4 has vibration-proofing and flame retardancy. The thickness of the vibration-proof material 4 is, for example, 23 mm. The thickness of the vibration-proof material 4 is along the Z-axis direction. The thickness of the vibration-proof material 4 may be, for example, 12.5 mm or more and 25 mm or less.

[0026] [Dry slab 3] The floor structure 1 comprises a dry deck (floor plate) 3 placed on vibration-proof materials 4. The dry deck 3 is also called a dry deck plate. A plurality of dry decks 3 are arranged in the longitudinal direction of the beams 10. The longitudinal direction of the dry deck 3 is a direction intersecting the longitudinal direction of the beams 10. The longitudinal ends of the dry deck 3 are supported by the vibration-proof materials 4. The longitudinal ends of the dry deck 3 are supported by the beams 10 via the vibration-proof materials 4. The vibration-proof materials 4 are sandwiched between the dry deck 3 and the upper flange 12 in the vertical direction.

[0027] The ends of a pair of dry decks 3 facing each other in the width direction of the beam 10 are each disposed on an upper flange 12. The ends of the pair of dry decks 3 are disposed apart from each other in the width direction of the beam 10, and are each disposed on a different vibration-proof material 4. A gap is formed between the ends of the pair of dry decks 3.

[0028] The dry deck 3 is, for example, an ALC deck. The dry deck 3 may be a precast concrete deck (PCa deck, PCa panel) or the like. The specific gravity of the ALC deck is, for example, 0.65.

[0029] At the longitudinal end of the dry deck 3, a recess 3e is formed that recesses upward from the lower surface 3c of the dry deck 3. The recess 3e is formed by an upper surface 3a and a slope 3b. The upper surface 3a of the recess 3e is disposed higher than the lower surface 3c of the dry deck 3. The slope 3b is inclined so as to connect the upper surface 3a and the lower surface 3c.

[0030] The vibration-proof material 4 and the upper flange 12 are disposed in a recess 3e of the dry deck 3. The upper surface 3a of the recess 3e is disposed so as to contact the upper surface of the vibration-proof material 4. The vibration-proof material 4 and the upper flange 12 are disposed above the lower surface 3c of the dry deck 3. In other words, the lower surface 3c is disposed below the upper flange 12.

[0031] The thickness of the dry deck 3 is the thickness from the lower surface 3c to the upper surface 3d, and is, for example, 150 mm. The thickness of the dry deck 3 in the portion where the recess 3e is formed is the thickness from the upper surface a of the recess 3e to the upper surface 3d, and is, for example, 100 mm. The depth of the recess 3e is the depth from the lower surface 3c to the upper surface 3a of the recess 3e, and is, for example, 50 mm.

[0032] [Floor material 20] The floor structure 1 of the building comprises a floor surface material 20 placed on a dry floor slab 3. The floor surface material 20 includes, for example, a soundproof mat 6, particle board 7, and flooring material (floor material) 8. The soundproof mat 6 is placed on the upper surface 3d of the dry floor slab 3. The soundproof mat 6 may be a double soundproof mat. The soundproof mat 6 is formed from a material capable of suppressing the transmission of sound and vibration. The particle board 7 and flooring material 8 are placed in this order on the soundproof mat 6. The flooring material 8 forms the floor surface of the upper floor.

[0033] The thickness of the soundproof mat 6 is, for example, 10 mm. The weight per unit area of ​​the soundproof mat 6 is, for example, 35 kg / m 2 The thickness of the particle board 7 is, for example, 9.0 mm. The weight per unit area of ​​the particle board 7 is, for example, 6.3 kg / m 2 The thickness of the flooring material 8 is, for example, 12 mm. The weight per unit area of ​​the flooring material 8 is, for example, 6.0 kg / m 2 It is.

[0034] The total thickness of the floor surface material 20 is, for example, 31 mm. The weight per unit area of ​​the floor surface material 20 is, for example, 145 kg / m 2 It is.

[0035] [Floor weight] The floor weight per unit area of ​​the floor structure 1 of the building is, for example, 140 kg / m 2 More than 180kg / m 2 The floor weight is the total weight of the dry deck 3 and the floor surface material 20 per unit area.

[0036] [Mounting bracket 5] The floor structure 1 of the building includes a mounting bracket 5 attached to a beam 10. The mounting bracket 5 is fixed to a bottom flange 13 of the beam 10 and supports a ceiling base material 30. The mounting bracket 5 may include, for example, a hanging bolt. The mounting bracket 5 may be a vibration-proof hanging material. The vibration-proof hanging material may include, for example, a spring member.

[0037] [Ceiling underlayment material 30] The floor structure 1 of the building includes a ceiling underlayment 30 supported by a beam 10 via a mounting bracket 5. The ceiling underlayment 30 includes, for example, a rafter, a rafter support, and a clip. The ceiling underlayment 30 may be arranged in a lattice pattern of, for example, 455 mm square. The ceiling underlayment 30 may be arranged in one direction, either in the X-axis direction or the Y-axis direction.

[0038] [Ceiling surface material 2] The floor structure 1 of a building includes a ceiling surface material 2 attached to a ceiling underlayment material 30. The ceiling surface material 2 is formed, for example, from a total of two gypsum boards. The total thickness of the two gypsum boards may be, for example, 25 mm or more. The ceiling surface material 2 may be formed into a panel with the ceiling underlayment materials 30 arranged in two directions, for example, in the X-axis direction and the Y-axis direction.

[0039] [Vibration suppression member 40] The floor structure 1 of the building includes a vibration suppression member (damper) 40 arranged on a ceiling surface material 2. The vibration suppression member 40 includes a rubber (elastic portion) 41 arranged on the ceiling surface material 2, and a weight 42 arranged on the rubber 41. The upper surface 42a of the weight 42 may be arranged, for example, above the upper surface 30a of the ceiling base material 30. The vibration suppression member 40 is arranged at a position away from the beam 10 in the X-axis direction. The vibration suppression member 40 is arranged, for example, in a dot shape in a plan view. The vibration suppression member 40 may be arranged at the center of the ceiling surface material 2 panelized into, for example, 455 mm square. The vibration suppression member 40 may be arranged at the center of an area surrounded by the ceiling base material 30 in a plan view. The position and number of the vibration suppression members 40 are not limited.

[0040] [Ceiling H3] The ceiling space H3 is the height from the upper surface 2a of the ceiling surface material 2 to the lower surface 3c of the dry floor slab 3. The ceiling space H3 may be, for example, 250 mm or more and 400 mm or less.

[0041] [Ceiling height H1] The ceiling height H1 is the height from the floor surface 8a of the lower floor 50B to the top surface 8a of the flooring material 8 of the upper floor 50. The ceiling height H1 is, for example, 2100 mm or more and 3500 mm or less. The floor structure of the lower floor may be the same as the floor structure 1 of the upper floor. The floor 50B of the lower floor may be the same as the floor 50 of the upper floor. The floor surface 8a of the lower floor 50B is the top surface of the flooring material 8B of the lower floor.

[0042] [Floor height H2] The floor height H2 is the height from the floor surface 8a of the lower floor 50B to the lower surface of the ceiling surface material 2. The floor height H2 is, for example, 2500 mm or more and 5000 mm or less.

[0043] [Problems with the prior art] Next, problems with the conventional technology will be described. A floor structure of a building having beams made of heavy steel frames is known as the conventional technology. The beams made of heavy steel frames are formed, for example, using steel material with a plate thickness of more than 6 mm. In the floor structure of a building, the sound insulation performance of floor impact sound is generally improved by increasing the floor rigidity. Therefore, in the floor structure of a building according to the conventional technology, beams made of heavy steel frames with high rigidity are used. The floor structure of a building having beams made of heavy steel frames is referred to as the floor structure of a building made of heavy steel frames. Also, the floor structure of a building having beams made of light steel frames is referred to as the floor structure of a building made of light steel frames.

[0044] The floor structure 1 of a heavy steel frame building has high rigidity, and the vibration-proofing material (vibration-proofing support material) of the floor slab can provide an efficient vibration-proofing effect. Therefore, in the floor structure according to the conventional technology, sufficient sound insulation performance was achieved even if the vibration-proofing material was thin. In this case, as long as the floor surface material such as floor mats had a certain weight, there was no problem with the sound insulation performance.

[0045] However, when light steel beams are used in place of heavy steel beams in the floor structure of a building, the vibration isolation effect is lower than in the case of heavy steel construction.

[0046] The Building Standards Act does not allow the freedom to set the height of a building's floor structure. Building design requires that a certain ceiling height (H1) be secured within a certain floor height to improve livability.

[0047] For example, in the case of a floor structure of a light-gauge steel-framed building, in order to improve the sound insulation performance of floor impact sound, it is possible to increase the total height (H2-H1) of the floor components that make up the floor structure. In this case, it is necessary to narrow the ceiling space H3 in order to secure the floor height H2 and ceiling height H1. The ceiling space H3 is the space between the floor slab and the ceiling surface material that face each other in the Z-axis direction.

[0048] When the ceiling space H3 is narrowed, air springs are formed in the ceiling space H3, and the floor impact sound emitted from the underside (backside) of the floor slab is amplified by the air springs and propagates to the rooms on the floor below. This phenomenon is called resonance transmission. Therefore, there is a demand for improved sound insulation performance against floor impact sound in the floor structure of a lightweight steel-framed building.

[0049] [Effects of the building floor structure 1 according to the embodiment] The floor structure 1 of the building in the embodiment comprises a beam 10 which is a light steel frame, an anti-vibration material 4 placed on the beam 10, a dry floor slab 3 supported on the beam 10 via the anti-vibration material 4, a floor surface material 20 placed on the dry floor slab 3, a mounting bracket 5 attached to the beam 10, a ceiling underlayment material 30 supported on the beam 10 via the mounting bracket 5, and a ceiling surface material 2 attached to the ceiling underlayment material 30.

[0050] In the floor structure 1 of the building, the thickness of the vibration-proof material 4 is 12.5 mm or more, the ceiling recess H3, which is the height between the lower surface 3c of the dry floor slab 3 and the upper surface 2a of the ceiling surface material 2, is 250 mm or more, and the floor weight, which is the total weight of the floor surface material 20 and the dry floor slab 3 per unit area, is 140 kg / m 2 That's all.

[0051] According to the floor structure 1 of the building of this embodiment, vibration-proof materials 4 are placed on the beams 10, and the dry deck 3 is supported via the vibration-proof materials 4, thereby damping vibrations of the dry deck 3.

[0052] According to the floor structure 1 of the building, by increasing the thickness of the floor surface material 20 and increasing the floor weight (weight of the floor 50), it is possible to lower the natural frequency of the floor 50. As a result, the floor structure 1 of a light-gauge steel-framed building can exhibit sound insulation performance equivalent to that of a floor structure of a heavy-gauge steel-framed building.

[0053] Furthermore, according to the floor structure 1 of the building of this embodiment, even if the ceiling space H3, which is the height between the lower surface 3c of the dry floor slab 3 and the upper surface 2a of the ceiling surface material 2, is narrow, the sound insulation effect can be enhanced. If the ceiling space H3 is narrow, air springs are formed in this ceiling space, and floor impact sound radiated from the lower surface 3c of the dry floor slab 3 may be amplified and propagated to rooms on the lower floor. According to the floor structure 1 of the building of this embodiment, even if the ceiling space H3 is narrow, the amplification of floor impact sound by air springs can be suppressed.

[0054] In addition, in the floor structure 1 of the building, the beam 10 has a web 11, an upper flange 12, and a lower flange 13, the vibration-proof material 4 is placed on the upper flange 12, and a recess 3e that is recessed upward from the lower surface 3c of the dry deck 3 is formed at the longitudinal end of the dry deck 3, and the upper flange 12 and the vibration-proof material 4 of the beam 10 are positioned in the recess 3e and are positioned above the lower surface 3c of the dry deck 3.

[0055] According to the floor structure 1 of the building of this embodiment, the upper flange 12 of the beam 10 can be placed in the recess 3e of the dry floor slab 3, thereby making it possible to obtain a ceiling height H1. This makes it possible to secure a living space for the lower floor formed below the ceiling surface material 2.

[0056] In the floor structure 1 of the building of this embodiment, the recess 3e is formed in the dry floor slab 3, so that the ceiling height H1 can be ensured. Therefore, the thickness of the dry floor slab 3 can be increased to increase the floor weight, and sound insulation performance can be improved. For example, in a configuration in which the recess 3e is not formed in the dry floor slab 3, if the thickness of the dry floor slab 3 is increased, it becomes difficult to ensure the ceiling height H1. However, in the floor structure 1 of the building, the recess 3e is formed, so that the floor weight can be increased to improve the sound insulation performance, and the ceiling height H1 can be ensured.

[0057] In addition, the floor structure 1 of the building further includes a vibration suppressing member 40 arranged on the ceiling surface material 2.

[0058] According to the floor structure 1 of a building having this configuration, the vibration suppressing member 40 is disposed on the ceiling surface material 2, thereby suppressing the vibration of the ceiling surface material 2. Therefore, in this embodiment, the floor impact sound on the upper floors of the building can be weakened, and the sound insulation performance can be improved. In the floor structure 1 of the building, by increasing the floor weight and disposing the vibration-proof material 4 and the vibration suppressing member 40, the sound insulation performance can be improved even when the ceiling space H3 is narrow.

[0059] Furthermore, in the building floor structure 1, the vibration suppression member 40 has rubber 41, which is an elastic part, arranged on the upper surface 2a of the ceiling surface material 2, and a weight 42 arranged on the rubber 41. The upper surface 42a of the weight 42 may be arranged above the upper surface 30a of the ceiling underlayment material 30. The upper surface 42a of the weight 42 may be arranged below the upper surface 30a of the ceiling underlayment material 30, or may be arranged at the same height as the upper surface 30a.

[0060] According to the floor structure 1 of the building of this embodiment, the weight 42 supported by the rubber 41 moves up and down, thereby damping the vibration of the ceiling surface material 2. This makes it possible to reduce floor impact noise on upper floors.

[0061] In addition, in the floor structure 1 of the building, the floor surface material 20 is the floor surface material 20 of the upper floor, and below the ceiling surface material 2 an indoor space of the lower floor having a predetermined ceiling height H1 is formed, and the ceiling height H1, which is the height from the floor surface 8a of the floor 50B of the lower floor to the underside of the ceiling surface material 2, is 2100 mm or more and 3500 mm or less, and the floor height H2, which is the height from the floor surface 8a of the floor 50B of the lower floor to the upper surface 8a of the floor surface material 20, which is the floor of the upper floor, is 2500 mm or more and 5000 mm or less.

[0062] According to the floor structure 1 of the building of this embodiment, the sound insulation performance can be improved, and the floor height H2 can be secured while maintaining the ceiling height H1.

[0063] In addition, in the floor structure 1 of a building, the thickness of the vibration-proof material 4 relative to the floor weight, which is the total weight of the floor surface material 20 and the dry floor slab 3 per unit area, may be 0.07 mm / kg or more and 0.18 mm / kg or less.

[0064] According to the building floor structure 1 of this embodiment, the floor weight per unit area can be made heavier than before, and the thickness of the vibration-proof material 4 can be made thicker than before.

[0065] [Performance evaluation experiment] The present inventors conducted an experiment to evaluate the performance of the building floor structure 1. In this experiment, Examples 1 and 2 and Comparative Examples 1 to 3 were examined.

[0066] Heavy floor impact sound was generated on the floor surface of the floor constituting each floor structure of the Example and Comparative Example, and the floor impact sound level was measured in the room on the lower floor. Specifically, a tire was dropped onto the floor of the upper floor, and the floor impact sound level was measured using a microphone in the room on the lower floor. The measurement result of Comparative Example 1 was used as a benchmark (BM), and the floor impact sound level difference between Comparative Example 1 and Examples 1 and 2 was calculated. The experimental results are shown in Table 1. Similarly, the floor impact sound level difference between Comparative Examples 2 and 3 and Comparative Example 1 was calculated.

[0067] [Table 1]

[0068] The damper in Table 1 is the vibration suppression member 40 described above.

[0069] [Table 2]

[0070] The thickness of the vibration-proof material relative to the floor weight in Table 2 is, as mentioned above, the thickness of the vibration-proof material relative to the floor weight, which is the total weight of the floor surface material and dry deck per unit area.

[0071] As shown in Table 1, it was demonstrated that Example 1 and Example 2 had sound insulation performance equivalent to that of Comparative Example 1.

[0072] [Variation 1] The above-mentioned floor structure 1 of the building has been described as having a vibration damping member 40 on the plaster board that is the ceiling surface material 2, but the floor structure 1 of the building may not have a vibration damping member 40.

[0073] [Variation 2] The above-mentioned floor structure 1 of a building has been described as including a vibration damping member 40 having a weight 42 placed on rubber 41, but the vibration damping member 40 is not limited to having rubber 41 and a weight 42. Furthermore, in the floor structure 1 of a building, the vibration damping member may be placed in a location other than on top of the ceiling surface material 2.

[0074] In addition, the present invention is not limited to the configuration shown here, and may be implemented in other embodiments in which other components are combined with the configurations and the like of the above-mentioned embodiment. In this regard, the present invention may be modified within the scope of the gist of the present invention, and may be appropriately determined according to the application form. [Explanation of symbols]

[0075] 1:Floor structure of the building 2: Ceiling surface material 2a: Top surface of ceiling material 2b: Underside of ceiling material 3: Dry floor slab 3c: Bottom surface 3e: Recess 4: Vibration isolation material 5: Mounting bracket 10: Beam (lightweight steel frame) 11: Web 12: Upper flange 13: Lower flange 20: Floor material 30: Ceiling underlayment 40: Vibration suppression member 41: Rubber (elastic part) 42: Weight 50: Floor (upper floor) 50B: Floor (lower floor)

Claims

1. The beams are made of light steel. A vibration-isolating material placed on the beam; A dry deck supported by the beam via the vibration-proof material; A floor surface material placed on the dry deck; A mounting bracket attached to the beam; A ceiling base material supported on the beam via the mounting bracket; A ceiling surface material attached to the ceiling base material, The thickness of the vibration-proof material is 12.5 mm or more, The ceiling recess, which is the height between the lower surface of the dry floor slab and the upper surface of the ceiling surface material, 250 mm or more, The floor weight, which is the total weight of the floor surface material and the dry floor slab per unit area, is 140kg / m ２ The floor structure of a building is characterized by the above.

2. The beam has a web, an upper flange, and a lower flange; The vibration-isolating material is placed on the upper flange, A recess is formed at the end of the dry deck in the longitudinal direction, the recess being recessed upward from the lower surface of the dry deck, 2. The floor structure of a building according to claim 1, wherein the upper flange of the beam and the vibration-proof material are disposed in the recess and above the lower surface of the dry deck slab.

3. 2. The floor structure of a building according to claim 1, further comprising a vibration suppressing member disposed on the ceiling surface material.

4. The vibration suppressing member is An elastic portion disposed on an upper surface of the ceiling surface material; 4. The floor structure of a building according to claim 3, further comprising a weight disposed on said elastic portion.

5. The floor surface material is a floor surface material for an upper floor, A lower floor indoor space having a predetermined ceiling height is formed below the ceiling surface material, The ceiling height, which is the height from the floor surface of the lower floor to the underside of the ceiling surface material, 2100 mm or more and 3500 mm or less, The floor height, which is the height from the floor surface of the lower floor to the upper surface of the floor surface material of the upper floor, 2. The floor structure of a building according to claim 1, characterized in that the thickness is 2500 mm or more and 5000 mm or less.

6. 2. The floor structure of a building according to claim 1, wherein the thickness of the vibration-proof material relative to the floor weight, which is the total weight of the floor surface material and the dry floor slab per unit area, is 0.07 mm / kg or more.

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