Wooden soundproof floor

Abstract

To provide a wooden sound insulation floor with good workability suitable for wooden construction, which can improve heavy floor impact sound insulation performance by increasing a stiffness ratio in the orthogonal direction to the longitudinal direction of small beams, while reducing increase in overall height.SOLUTION: A building has a structural floor 50B located between upper and lower floors of the building. The structural floor has a plurality of small beams 10, a plurality of lower intersection plates 12, and a single or plurality of upper intersection plates 14. The plurality of small beams 10 are fixed to a building frame at both ends, extend horizontally in their longitudinal direction, and are positioned parallel to each other in their width direction with a first spacing P1 separating them from each other. The plurality of lower intersection plates 12 are fixed to the building frame at both ends, extend horizontally in the width direction, are fixed in the middle to the lower surface of the plurality of small beams, and are located parallel to each other in the longitudinal direction with a second spacing P2 separating them from each other. The upper intersection plate 14 is fixed to the building frame at both ends, are fixed in the middle to the upper surface of the plurality of small beams, and is positioned horizontally opposite to the plurality of lower intersection plates.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a wooden sound-insulating floor for reducing heavy floor impact noise. [Background technology]

[0002] In recent years, there has been a demand for wooden sound-insulating floors that meet the heavy-duty floor impact sound insulation performance and light-duty floor impact sound insulation performance requirements of JIS A 1418 for floor structures in buildings such as wooden residential buildings. "Heavy floor impact noise" refers to the dull, low-pitched noise that travels to the floor below, such as a loud thud or clang, made when a child jumps around or moves a chair. "Light floor impact noise" refers to a relatively light, high-pitched sound, such as the clunk made when a spoon is dropped on the floor, or the clatter made when walking in slippers.

[0003] Of these, light floor impact noise can be reduced relatively easily by using floor surface materials (such as carpet), while heavy floor impact noise is difficult to reduce using only floor surface materials. Therefore, in order to reduce heavy floor impact noise, for example, Patent Document 1 is disclosed.

[0004] The "floor structure" of Patent Document 1 has floor beams arranged at regular intervals, floor joists arranged at regular intervals on top of the floor beams in a direction perpendicular to the floor beams, and floor panels placed on top of the floor joists. In this floor structure, the floor panels are made of 15mm thick particle board, and the floor joists are made of wooden joists with a width of 38mm and a height of 51mm, and are arranged at a pitch of 352mm. In addition, the floor joists are made of steel joists with a width of 75mm, a height of 175mm or more, and a thickness of 2.3mm, and are arranged at a pitch of 750mm. This increases the bending rigidity per unit width of the entire floor to 3.45 x 10 6 [N m 2 / m] or more, and the surface density of the entire floor is 26.94 [kg / m 2 ] or more.

[0005] Also, Non-Patent Document 1 is a reference document relating to the vibration characteristics of anisotropic slabs. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 9-88299 [Non-patent literature]

[0007] [Non-Patent Document 1] Daisuke Watanabe, Katsuo Inoue, Toshio Suzuki, "Basic Study on Vibration Characteristics of Anisotropic Slabs", Journal of Environmental Engineering, Architectural Institute of Japan, 2012, Vol. 77, No. 680, pp. 761-769 Summary of the Invention [Problem to be solved by the invention]

[0008] However, the "floor structure" of Patent Document 1 had the following problems. (1) Steel beams are used as floor joists (hereinafter referred to as "joists"), which are heavier than wooden beams, making them difficult to handle manually and difficult to process to fit the dimensions of the site, resulting in poor work efficiency. (2) In buildings (e.g., wooden structures) where the outer frame (center beam or main beam) supporting the sub-joists is made of wood, the thermal expansion coefficients are different from those of the steel sub-joists, making it difficult to form a strong bond, and gaps and loosening are likely to occur. (3) In conventional framework construction, the beam frame is only unidirectional, and the rigidity in the orthogonal direction of the beam is weak. Therefore, in order to improve the heavy floor impact sound insulation performance, it is necessary to significantly increase the rigidity in the orthogonal direction of the beam. (4) When the steel beams in the "floor structure" of Patent Document 1 are replaced with wooden beams, the surface density of the entire floor is increased (for example, 26.94 kg / m 2 ] or more), it would be necessary to enlarge both the floor joists and floor beams, which would make the overall height of the floor structure excessive.

[0009] The present invention was devised to solve the above-mentioned problems. That is, the first object of the present invention is to provide a wooden sound-insulating floor that is easy to process and suitable for wooden buildings, that can improve the rigidity ratio in the direction perpendicular to the longitudinal direction of the joists to improve the heavy floor impact sound insulation performance, and that can suppress an increase in overall height. A second object is to provide a wooden sound-insulating floor that can be provided with a double floor and a suspended ceiling and that can suppress an increase in overall height. [Means for solving the problem]

[0010] According to the present invention, a structure floor is provided between upper and lower floors of a building, The structural floor includes a plurality of small beams, both ends of which are fixed to the building frame, extending horizontally in the longitudinal direction thereof and positioned parallel to each other at a first interval in the width direction thereof; a plurality of lower cross plates, each of which has both ends fixed to the frame, extends horizontally in the width direction, has its middle portion fixed to the lower surfaces of the plurality of small beams, and is positioned parallel to each other at a second interval in the longitudinal direction; A single or multiple upper cross plates, both ends of which are fixed to the main body and intermediate portions of which are fixed to the upper surfaces of the multiple small beams, and which are positioned horizontally opposite the multiple lower cross plates; and The spaces above and below the lower cross plates are connected by gaps between the lower cross plates due to the second intervals. Wooden acoustic flooring is provided. Further, according to the present invention, there is provided a structure floor located between upper and lower floors of a building, The structural floor includes a plurality of small beams, both ends of which are fixed to the building frame, extending horizontally in the longitudinal direction thereof and positioned parallel to each other at a first interval in the width direction thereof; a plurality of lower cross plates, each of which has both ends fixed to the frame, extends horizontally in the width direction, has its middle portion fixed to the lower surfaces of the plurality of small beams, and is positioned parallel to each other at a second interval in the longitudinal direction; A single or multiple upper cross plates are fixed at both ends to the main body, and at their middle parts are fixed to the upper surfaces of the multiple small beams, and are positioned horizontally opposite the multiple lower cross plates. The small beam, the lower cross plate, and the upper cross plate are made of wood or wood-based material; The wooden sound-insulating floor is provided in which the weak axis / strong axis ratio of bending rigidity in the width direction relative to the longitudinal direction is set to 10% or more. [Effects of the Invention]

[0011] According to the above-mentioned configuration of the present invention, the upper cross plate and the lower cross plate are fixed to the upper and lower surfaces of the sub-beam and extend horizontally in the width direction of the sub-beam, so that even if the thickness of the upper cross plate and the lower cross plate is small compared to the height of the sub-beam, the bending rigidity of the composite beam consisting of the lower cross plate and the upper cross plate can be increased. Therefore, even with wood materials that are easy to process and suitable for wooden buildings, the bending rigidity ratio in the direction perpendicular to the longitudinal direction of the beams can be increased to improve the heavy floor impact sound insulation performance, and the increase in overall height can be suppressed. [Brief explanation of the drawings]

[0012] [Figure 1] This is the result of a trial calculation of the effect of improving the weak axis / strong axis ratio of bending rigidity. [Figure 2] FIG. 1 is an explanatory diagram of a wooden sound-insulating floor of a reference example. [Figure 3] FIG. 1 is an explanatory diagram of a wooden sound-insulating floor showing a first embodiment of the present invention. [Figure 4] FIG. 10 is an explanatory diagram of a wooden sound-insulating floor showing a second embodiment of the present invention. [Figure 5] FIG. 10 is a side cross-sectional view of a wooden sound-insulating floor according to a third embodiment of the present invention. [Figure 6] This is a general formula showing the relationship between the cross-sectional shape of a beam and the second moment of area. DETAILED DESCRIPTION OF THE INVENTION

[0013] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. In addition, common parts in the drawings are given the same reference numerals, and duplicated explanations will be omitted.

[0014] (Estimated effect of floor joists on wooden frame floors) 1. Purpose Regarding the effect of reducing floor impact noise by floor joists perpendicular to beams, we carried out trial calculations using the basic impedance (the ratio of the excitation force F on an infinite plate to the excitation point response speed V), which is the basic performance of floor vibration, as an index. "Fundamental impedance Z" means the ratio (Z=F / V) between the excitation force F on an infinite plate and the floor response speed V at the excitation point.

[0015] 2. Method of investigation The basic impedance Z of the floor, which is related to the heavy floor impact sound insulation performance, is calculated and examined. To calculate the basic impedance Z [kg / s] of a framework floor, the following calculation formula for anisotropic slabs shown in Non-Patent Document 1 is applied. Z=8((B1 B2) 0.5 M) 0.5 ···(1) Where, B1: Strong axis bending stiffness [Nm 2 ], B2: Weak axial bending stiffness [Nm 2 ], M: Areal density [kg / m 2 ]. The basic impedance level Lz [dB] was calculated using the following formula. Lz=20log 10 Z···(2)

[0016] Figure 1 shows the results of a trial calculation of the effect of improving the weak axis / strong axis ratio of bending stiffness. This figure shows how the basic impedance level improves as the weak axis / strong axis ratio of bending stiffness is increased relative to condition 1. It shows that an improvement of more than 5 dB can be achieved by increasing the weak axis / strong axis ratio of bending stiffness to 3% or more. Furthermore, an improvement of nearly 10 dB can be achieved by increasing the ratio to around 20%. From the above results, it can be seen that the basic impedance level can be improved by increasing the weak axis / strong axis ratio of bending stiffness.

[0017] FIG. 2 is an explanatory diagram of the wooden sound-insulating floor of Reference Example 1. FIG. 2(A) is a side cross-sectional view thereof. In this diagram, the wooden sound-insulating floor of Reference Example 1 has a structural floor (hereinafter referred to as reference structural floor 1) located between upper and lower floors of a building (not shown). The reference structural floor 1 has a plurality of reference joists 2, a plurality of reference reinforcements 4, and a reference upper floor 6. The plurality of reference beams 2 extend horizontally with both ends fixed to the building frame. A plurality of reference reinforcements 4 extend horizontally perpendicular to the reference sub-beam 2 and are fixed at both ends to the reference sub-beam 2 . The reference upper floor 6 is fixed to the upper surface of the reference joist 2.

[0018] In this example, the reference beam 2 is a piece of wood with a width of 15 cm and a height of 33 cm. The center-to-center distance between the multiple reference beams 2 is set to 45.5 cm. The reference reinforcement material 4 is a piece of wood with a width of 10.5 cm and a height of 10.5 cm, and the center-to-center distance between the multiple reference reinforcement materials 4 is set to be the same as the center-to-center distance between adjacent reference sub-joists 2. The reference upper floor 6 is made of a wooden material (for example, plywood, gypsum board, etc.) with a thickness of 6.7 cm. The heavy-duty floor impact sound level of the above-mentioned reference structural floor 1 combined with a double floor and double ceiling is substantially below the L-45 standard curve, and it has been confirmed that it meets the LH-45 standard for heavy-duty floor impact sound.

[0019] Figure 2(B) is a cross-sectional view (hereinafter referred to as "equivalent cross-sectional view") that contributes to the bending rigidity of an X-direction composite beam consisting of one reference sub-beam 2 and a reference top floor 6 when the reference top floor 6 is firmly (integrally) fixed to the top surface of the reference sub-beam 2. In this case, both ends of the reference top floor 6 are symmetrical planes, and its total width is the center-to-center distance of the reference sub-beams 2. 2(C) is a CC cross-sectional view of FIG. 2(A), and is an equivalent cross-sectional view that contributes to the bending rigidity of a Y-direction composite beam consisting of one reference reinforcement 4 and a reference upper surface floor 6 when the reference upper surface floor 6 is firmly (integrally) fixed to the top surface of the reference reinforcement 4. In this case, the total width of the reference upper surface floor 6 is the center-to-center distance of the reference reinforcement 4.

[0020] The bending rigidity EI of a beam is the product of the beam's modulus of elasticity E and its second moment of area I. In this application, the beams that make up the wooden sound-insulating floor are made of wood or wood-based materials. Therefore, the beams' modulus of elasticity E is substantially the same, so the bending rigidity EI can be compared by comparing the second moment of area I.

[0021] Figure 6 shows the general formula showing the relationship between the cross-sectional shape of a beam and the moment of inertia I. In this diagram, (A) is a rectangular cross section, (B) is a T-shaped cross section, (C) is a D-shaped cross section, and (E) is a modified D-shaped cross section. Hereafter, the respective second moments of area I will be referred to as IA, IB, IC, and ID. Furthermore, when necessary, they will be distinguished by adding subscripts.

[0022] From the equation in Figure 6(B), the second moment of area IB1 in Figure 2(B) is approximately 1.20 × 10 -3 m 4 (Approx. 0.0026m per unit width 4 / m), and the second moment of area IB2 in Figure 2(C) is approximately 0.8 × 10 -4 m 4 (Approx. 0.0002m per unit width 4 / m). Therefore, it can be seen that the ratio of the bending rigidity of the Y-direction composite beam ("weak axis bending rigidity") to the bending rigidity of the X-direction composite beam ("strong axis bending rigidity") (hereinafter referred to as "weak axis / strong axis bending rigidity ratio R") is only about 7%.

[0023] In Figure 2, the multiple reference reinforcements 4 are not continuous, and both ends of each are fixed to the side of the adjacent reference sub-beam 2. Therefore, it is difficult to smoothly transmit the bending moment (or tensile stress) acting on the reference reinforcement 4 at the connection surface, and the weak axis / strong axis ratio R of bending rigidity is thought to be even lower in reality.

[0024] FIG. 3 is an explanatory diagram of a wooden sound-insulating floor 100 according to a first embodiment of the present invention, where (A) is a side cross-sectional view. The wooden sound-insulating floor 100 has a structural floor 50 located between upper and lower floors of a building (not shown). The structural floor 50 (hereinafter referred to as structural floor 50A) in FIG. 3(A) has a plurality of joists 10, a plurality of lower cross plates 12, and a single upper cross plate 14. The structural floor 50 has a width of 3 m, a length of 4 m, and an area of ​​12 m. 2 However, the present invention is not limited to this size or area.

[0025] The structural floor 50 of the present invention is made of wood or wood-based materials. "Wood" refers to solid wood that has been cut directly to the required dimensions from a single log, such as lumber or boards. "Wood-based materials" refer to materials that have been made by breaking down raw wood into large and small elements (components) and then reconstructing them. Examples of wood-based materials include laminated lumber, structural plywood, and particle board.

[0026] 3(B) is an equivalent cross-sectional view that contributes to the bending rigidity of an X-direction composite beam 16A consisting of one sub-beam 10 and an upper cross-plate 14 when a single upper cross-plate 14 is firmly (integrally) fixed to the upper surface of the sub-beam 10. In this case, both ends of the upper cross-plate 14 are symmetrical planes, and its total width is the center-to-center distance P1 of the sub-beams 10 (hereinafter referred to as the "first distance P1"). 3(C) is a cross-sectional view taken along CC in FIG. 3(A), in which the upper cross plates 14 and the lower cross plates 12 are firmly connected by small beams 10 at a pitch of a first interval P1. Therefore, FIG. 3(C) is an equivalent cross-sectional view that contributes to the bending rigidity of the Y-direction composite beam 16B consisting of a pair of upper and lower cross plates 14 and lower cross plates 12.

[0027] The multiple small beams 10 are fixed at both ends to the building's skeleton, extend horizontally in the longitudinal direction, and are positioned parallel to each other at a first interval P1 in the width direction. The building is preferably a wooden building, but may also be a concrete building. The skeleton is preferably a horizontal beam (center beam or main beam) of a wooden building. Hereinafter, the "longitudinal direction" refers to the length direction of the beam 10, and is abbreviated to "X direction" when necessary. The "width direction" refers to the width direction of the beam 10, and is abbreviated to "Y direction" when necessary. The X direction and Y direction are perpendicular to each other in the same horizontal plane.

[0028] The multiple lower cross plates 12 have both ends fixed to the building's main body, extend horizontally in the width direction (Y direction), and have their middle parts fixed to the undersides of the multiple small beams 10, and are positioned parallel to each other in the longitudinal direction (X direction) at a second interval P2.

[0029] The single upper cross plate 14 has both ends fixed to the building frame and a middle portion fixed to the upper surfaces of the plurality of small beams 10 , and is positioned horizontally opposite the plurality of lower cross plates 12 .

[0030] In this example, the beams 10 are made of wood with a width of 15 cm and a height of 33 cm, the same as the reference beam 2. The center-to-center distance P1 between the multiple beams 10 is set to 45.5 cm, the same as the reference beam 2. The lower cross boards 12 are narrow wooden boards with a width b1 and a thickness S1, and the center-to-center distance P2 (hereinafter referred to as the "second distance P2") between the multiple lower cross boards 12 is set to be the same as the center-to-center distance P1 between adjacent joists 10 (and reference joists 2). The upper cross plate 14 is a single flat plate 14A with a thickness S that tightly covers the upper surfaces of the multiple sub-beams 10. Note that the single flat plate 14A may have joints as long as it is firmly fixed to the upper surfaces of the sub-beams 10.

[0031] If the thickness S is 6.7 cm, the same as the reference beam 2, and the width b1 of the lower cross plate 12 is 15 cm, the same as the beam 10, the second moment of area IB2 of the X-direction composite beam 16A in Figure 3(B) is approximately 1.20 × 10 -3 m 4 In this case, the moment of inertia IB2 per unit width is approximately 0.0026m 4 / m. Furthermore, from the formula in Figure 6(D), when the thickness S1 is 3.2 cm, the second moment of area ID2 of the Y-direction composite beam 16B in Figure 3(C) is approximately 0.6 × 10 -3 m 4 (Approx. 0.0013m per unit width 4 / m). Therefore, it can be seen that the ratio R of the weak axis to the strong axis of bending stiffness increases by 50% or more (to about 51% in this example).

[0032] In addition, if the width b1 of the lower cross plate 12 is 30 cm, twice that of the sub-beam 10, and the thickness S1 is 4 cm, and other factors are the same, then from the equation in Figure 6(D), the second moment of area ID2 of the X-direction composite beam 16A is approximately 1.28 × 10 -3 m 4 (Approx. 0.0028m per unit width 4 In this case, the ratio R of the bending stiffness between the weak axis and the strong axis can be further increased to approximately 106%.

[0033] Furthermore, in this example, the lower cross plate 12 is continuous and not separated by the small beams 10. The upper cross plate 14 and the lower cross plate 12 are firmly connected by the small beams 10 at a pitch of center-to-center distance P1. Therefore, buckling of the upper cross plate 14 and the lower cross plate 12 can be prevented, and the compressive stress and tensile stress acting on them can be smoothly transmitted.

[0034] FIG. 4 is an explanatory diagram of a wooden sound-insulating floor 100 according to a second embodiment of the present invention, where (A) is a side cross-sectional view. The structural floor 50B in FIG. 4(A) (hereinafter referred to as structural floor 50B) has a plurality of joists 10, a plurality of lower cross plates 12, and a plurality of upper cross plates 14. In this example, the upper cross plates 14 are a plurality of narrow plates 14B positioned opposite the plurality of lower cross plates 12. The other configurations are the same as those in the first embodiment.

[0035] 4(B) is an equivalent cross-sectional view showing the contribution to the bending rigidity of one small beam 10. In this case, the upper cross plates 14 are made up of multiple narrow plates 14B, and gaps are formed between them in the X direction. Therefore, the upper cross plates 14 do not contribute to the bending rigidity in the X direction. Figure 4(C) is a CC cross-sectional view of Figure 4(A), and is an equivalent cross-sectional view of a Y-direction composite beam 16B consisting of a pair of upper and lower upper cross-plates 14 and lower cross-plates 12, where the upper cross-plates 14 and lower cross-plates 12 are firmly connected by small beams 10 at a pitch of center-to-center distance P1.

[0036] From the equation in Figure 6(A), the second moment of area IA3 in Figure 4(B) is approximately 4.49 × 10 -4 m 4 (Approx. 0.00099m per unit width 4 / m). Furthermore, from the equation in Figure 6(D), when b = b1 = 15 cm, s = 6.7 cm, and s1 = 3.2 cm, the second moment of area ID3 in Figure 4(C) is approximately 4.72 × 10 -4 m 4 (Approx. 0.00104m per unit width 4 / m). Therefore, the amount of components and floor weight can be reduced compared to the first embodiment, while the weak axis / strong axis ratio R of bending rigidity can be set to approximately 105%, and the distribution of bending rigidity in each direction can be made approximately equal.

[0037] FIG. 5 is a side cross-sectional view of a wooden sound-insulating floor 100 according to a third embodiment of the present invention. In this example, the wooden sound-insulating floor 100 has a double floor 20 and a suspended ceiling 30 in addition to the structural floor 50B of the second embodiment. The double floor 20 is supported on the upper surface of the structural floor 50B and extends horizontally. The suspended ceiling 30 is suspended independently from the building frame and extends horizontally.

[0038] 5, the raised floor 20 has a plurality of support legs 22 supported on the structural floor 50B and floor material 24 supported thereon. The support legs 22 are made up of, for example, a combination of vibration-isolating rubber, metal bolts, and panel supports. In this example, the support legs 22 are fixed to the upper surface of the joists 10 and support the underside of the double floor 20. With this configuration, the gap between the double floor 20 and the structural floor 50B can be set narrow without being affected by the upper cross plate 14. However, this configuration is not essential, and the support legs 22 may be fixed to the upper surface of the upper cross plate 14 .

[0039] With the above-described configuration, the light floor impact noise and heavy floor impact noise generated on the double floor 20 can be reduced.

[0040] In FIG. 5, a suspended ceiling 30 has a plurality of suspension beams 32, a plurality of suspension hardware 34, and a ceiling board 36.

[0041] The plurality of suspension beams 32 are each fixed at both ends to the building frame (for example, the main beams) and extend horizontally between and away from the sub-beams 10, the lower cross plate 12, and the upper cross plate 14.

[0042] The hanging hardware 34 is installed at intervals along the length of the hanging beam 32, with its upper end fixed to the hanging beam 32 and its lower end fixed to the ceiling board 36. The middle part of the hanging hardware 34 is located in the gap in the length direction of the lower cross plate 12. The ceiling board 36 has its upper surface fixed to the hanging hardware 34 and extends horizontally.

[0043] With the above-described configuration, the suspended ceiling 30 is not directly connected to the structural floor 50B, but is suspended independently from the building frame, thereby blocking out light and heavy floor impact noise generated above. Furthermore, by integrating the pocket spaces between the double floor and double ceiling, the resonance frequency of the air springs can be significantly reduced, thereby lowering the resonance frequency and improving sound insulation performance.

[0044] (ratio of weak axis / strong axis bending stiffness) From the above-described embodiment of the present invention, it is preferable that the ratio of the weak axis / strong axis of the bending rigidity in the width direction to the longitudinal direction is set to 10% or more, which is higher than 7% of the reference structural floor 1. Furthermore, based on the calculation results in Figure 1, if the weak axis / strong axis ratio is increased to 50%, an improvement in the basic impedance level of more than 10 dB can be obtained, so it is preferable that the weak axis / strong axis ratio of bending rigidity be 10% or more and 50% or less. Furthermore, in order to equalize the vibration direction when heavy floor impact noise occurs, it is preferable that the bending rigidity in the longitudinal direction and the width direction be equal, and from this point of view, it is preferable that the ratio of the weak axis to the strong axis of the bending rigidity be 50% or more and 100% or less. Furthermore, the bending rigidity in the width direction may be set to be greater than the bending rigidity in the longitudinal direction, and from this point of view, the weak axis / strong axis ratio of the bending rigidity defined above may be 100% or more.

[0045] According to the above-described embodiment of the present invention, the upper cross plate 14 and the lower cross plate 12 are fixed to the upper and lower surfaces of the sub-beam 10 and extend horizontally in the width direction of the sub-beam 10. This makes it possible to increase the bending rigidity of the composite beam (Y-direction composite beam 16B) consisting of the lower cross plate 12 and the upper cross plate 14, even if the thickness of the upper cross plate 14 and the lower cross plate 12 is small compared to the height of the sub-beam 10. Therefore, even if the wood is easy to process and suitable for wooden construction, the weak axis / strong axis ratio R of the bending rigidity in the direction perpendicular to the longitudinal direction of the beam 10 can be increased to improve the heavy floor impact sound insulation performance and suppress an increase in overall height.

[0046] The scope of the present invention is not limited to the above-described embodiments, but is indicated by the claims, and further includes all modifications within the meaning and scope equivalent to the claims. [Explanation of symbols]

[0047] E elastic modulus, Z fundamental impedance, I, IA, IB, IC, ID Moment of inertia, P1 center distance (first distance), P2 center distance (second distance), R: Weak axis / strong axis ratio of bending stiffness, 1: Reference structural floor, 2 Reference beams, 4 Reference reinforcements, 6 Reference top floor, 10 Small beams, 12 Lower cross plate, 14 Upper cross plate, 14A flat plate, 14B narrow plate, 16A X direction composite beam, 16B Y direction composite beam, 20 double floor, 22 support leg, 30 Suspended ceiling, 32 Suspension beam, 34 Suspension hardware, 36 Ceiling board, 50, 50A, 50B structural floor, 100 wooden soundproof floor

Claims

1. It has a structural floor located between the upper and lower floors of the building, The structural floor includes a plurality of small beams, both ends of which are fixed to the skeleton of the building, extending horizontally in the longitudinal direction thereof and positioned parallel to each other at a first interval in the width direction thereof; a plurality of lower cross plates, each of which has both ends fixed to the frame, extends horizontally in the width direction, has intermediate portions fixed to the lower surfaces of the plurality of small beams, and is positioned parallel to each other at a second interval in the longitudinal direction; A single or multiple upper cross plates are fixed at both ends to the main body, and at their middle parts are fixed to the upper surfaces of the multiple small beams, and are positioned horizontally opposite the multiple lower cross plates. A wooden sound-insulating floor in which the spaces above and below the lower cross boards are connected by gaps between the lower cross boards that are spaced apart by the second intervals.

2. It has a structural floor located between the upper and lower floors of the building, The structural floor includes a plurality of small beams, both ends of which are fixed to the skeleton of the building, extending horizontally in the longitudinal direction thereof and positioned parallel to each other at a first interval in the width direction thereof; a plurality of lower cross plates, each of which has both ends fixed to the frame, extends horizontally in the width direction, has intermediate portions fixed to the lower surfaces of the plurality of small beams, and is positioned parallel to each other at a second interval in the longitudinal direction; A single or multiple upper cross plates are fixed at both ends to the main body, and at their middle parts are fixed to the upper surfaces of the multiple small beams, and are positioned horizontally opposite the multiple lower cross plates. The small beam, the lower cross plate, and the upper cross plate are made of wood or wood-based material; A wooden sound-insulating floor, wherein the ratio of the weak axis / strong axis of bending rigidity in the width direction to the longitudinal direction is set to 10% or more.

3. 3. The wooden sound-insulating floor according to claim 1, wherein the upper cross plate is a single flat plate that covers the plurality of small beams without any gaps.

4. 3. The wooden sound-insulating floor according to claim 1, wherein the upper cross planks are a plurality of narrow planks positioned opposite the plurality of lower cross planks.

5. A suspended ceiling is provided which is suspended independently from the frame and extends horizontally, The suspended ceiling has a plurality of suspension beams, a plurality of suspension hardware, and a ceiling board, The plurality of suspension beams are fixed at both ends to the frame, and extend horizontally between and away from the small beams, the lower cross plate, and the upper cross plate; The plurality of hanging hardware are installed at intervals along the length direction of the hanging beam, and their upper ends are fixed to the hanging beam and their lower ends are fixed to the ceiling board, The ceiling board has its upper surface fixed to the hanging hardware and extends horizontally, 3. The wooden sound-insulating floor according to claim 1, wherein the intermediate portion of the hanging metal fitting is located in the longitudinal gap of the lower cross plate.

6. 3. The wooden sound-insulating floor according to claim 1 or 2, further comprising a double floor supported on the upper surface of the structural floor and extending horizontally.

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