JP3755442B2 - Interkita structure and floor structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a floor structure in which floor materials are arranged at a predetermined distance on a floor base such as a concrete slab, and a joist structure used in the floor structure.
[0002]
[Prior art]
Conventionally, in a dry double floor structure in which floor materials are arranged at a predetermined distance on a floor base such as a concrete slab, the floor materials are supported by supporting legs and joists. In such a dry double floor structure, when an impact is applied to the floor, the impact sound is transmitted from the floor material to the concrete slab through the space below the floor material, and the transmitted impact sound is transmitted downstairs via the concrete slab. May be transmitted to other rooms.
[0003]
In the conventional dry double floor structure, by placing a porous material such as glass wool on a concrete slab, or by arranging a vibration damping sheet or the like between a flooring panel and a base panel constituting the floor material, The floor impact sound transmitted to the room below the floor through the transmission path is suppressed.
[0004]
[Problems to be solved by the invention]
However, as described above, the floor impact sound absorbing method of arranging glass wool on the concrete slab is suitable for absorbing impact sound in the high frequency region, but has a low frequency region of 250 Hz or less that has a great influence on the downstairs room. There is a problem that the impact sound is not sufficiently absorbed, and the floor impact sound cannot be effectively absorbed. In addition, in the case of a building in which other members such as piping are arranged in the under-floor space between the flooring and the concrete slab, there may be a case where glass wool cannot be installed for reasons such as hindering the installation of piping or the like. . In addition, in the configuration in which the vibration damping sheet is disposed between the flooring and the base panel, the construction work becomes complicated and the construction cost is greatly increased.
[0005]
The present invention has been made in consideration of the above circumstances, and has no problem such as interference with other members in the underfloor space, and effectively prevents floor impact sound without complicating construction work. An object of the present invention is to provide a joist structure and a floor structure that can be absorbed into the floor.
[0006]
[Means for Solving the Problems]
  In order to solve the above problems,Tomorrow,floorFloor material placed at a predetermined distance above the base, RoomA joist structure that is supported by the walls that make up the space,in frontExtending along the wallTokitaElementAnd the joist member has a surface opposite to the surface facing the wall.ApertureIs formed, andThe sky leading to the openingCaveFormedRukoIt is characterized by.
  Further, the present invention is a joist structure for supporting a floor material arranged at a predetermined distance above a floor base at a wall side that constitutes a room space, and is substantially along the wall of the wall. When the joist member extends over the entire width, the joist member has an opening formed on at least one end side in the extending direction along the wall, and the extension extends continuously to the opening. A cavity is formed over almost the entire length in the direction.
[0007]
  more thanAccording to the configurationElementIs a resonator because it has an opening and a cavity that continues to the opening, and is due to losses such as air resistance at the opening.SuckingIt will function as a sound body. Therefore, even when an impact is applied to the floor material and a floor impact sound is generated in the underfloor space, the floor impactSound with a joistCan be absorbed. In this way, the joist structure has a sound absorbing function in addition to the function of supporting the floor material in the same manner as the conventional joist, so it is not necessary to install glass wool on the floor base. No unnecessary work is required, and there is no problem such as interference with other members in the underfloor space.
[0008]
  In addition, this departureTomorrow,floorFloor material placed at a predetermined distance above the base, RoomA joist structure that is supported by the walls that make up the space,in frontThe joist member extends along the wall.Equipped, Said joist memberInIsOn the surface opposite to the surface facing the wallOpeningPart is formedAndAnd theOpeningPartAnd a cavity extending to the wall side is formed.
[0009]
According to this configuration, as compared with the case where the joist is installed in a substantially rectangular parallelepiped shape, the unevenness of the reflection surface of the floor impact sound generated in the underfloor space is large, and more floor impact sound can be absorbed. At the same time, an effect of scattering sound can be obtained. Therefore, it is possible to suppress the floor impact sound due to the impact or the like to the downstairs.
[0010]
  In addition, this departureMing the floorFloor material placed at a predetermined distance above the base, RoomA joist structure that is supported by the walls that make up the space.,in frontExtending along the wallComprising a joist member, the joist member,Arranged in the vertical direction,A first part composed of a material of a first densityMinuteAnd a second portion made of a material having a density different from the first density.It may be a configuration.
[0011]
In this configuration, when the floor material is a vibration propagation path when an impact is applied, portions of materials having different densities, that is, portions having different acoustic impedances, are arranged in the vertical direction of the joist structure. Therefore, when the impact vibration is propagated as described above, it is possible to suppress the vibration that is reflected at the boundary surface having different acoustic impedance and propagates from the joist structure to the floor base.
[0012]
  The floor structure according to the present invention isfloorA flooring disposed at a predetermined distance above the base, and a support leg provided on the floor base and supporting the floor;RoomConfigure the spacewallExtending alongShiSupport the flooringIt has a thick joist,The joist has a surface opposite to the surface facing the wall.ApertureIs formed, andThe sky leading to the openingCaveFormedRukoIt is characterized by.
  In addition, a floor structure according to the present invention includes a floor material arranged at a predetermined distance above a floor base, a support leg provided on the floor base and supporting the floor material, and a room space. A wall joist that extends over substantially the entire width of the wall along the constituting wall and supports the flooring, and the joist has an opening on at least one end side in the extending direction along the wall. And a cavity is formed over substantially the entire length in the extending direction in connection with the opening.
[0013]
  In addition, the present inventionPertaining toThe floor structurefloorA flooring disposed at a predetermined distance above the base, and a support leg provided on the floor base and supporting the floor;RoomConfigure the spacewallExtending along the root and supporting the flooringThickAnd said jotaInIsOn the surface opposite to the surface facing the wallOpeningPart is formedAndAnd theOpeningPartAnd a cavity extending to the wall side is formed.
[0014]
  In addition, the present inventionPertaining toThe floor structure is,floorA flooring disposed at a predetermined distance above the base, and a support leg provided on the floor base and supporting the flooring;, RoomMake up spaceWallExtending along the root and supporting the flooringThickComprising the rootThickArranged in the vertical direction,A first part composed of a material of a first densityMinuteAnd a second portion made of a material having a density different from the first density.HaveRuIt may be a configuration.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
A. First embodiment
A-1. Floor structure
First, FIG. 1 is a perspective view of a dry double floor structure 100 having a joist according to the first embodiment of the present invention, and FIG. 2 is a side sectional view showing the vicinity of a wall of the floor structure. In FIG. 1, the floor panel structure 20 is indicated by a two-dot chain line in order to clearly show the joist 10 according to the present embodiment.
[0016]
As shown in FIGS. 1 and 2, the dry double floor structure 100 is disposed in a room space defined by a wall 30 and a concrete slab (floor base) 35, and an upper surface of the concrete slab 35. The floor panel structure 20 is disposed at a predetermined distance between the floor panel structure 20 and the joist 10 and the support legs 40 when the floor panel structure 20 is supported.
[0017]
As shown in FIG. 2, the floor panel structure 20 includes a base panel 22, a flooring panel 23 that is stacked on the base panel 22, a finishing panel (not shown) that is stacked on the flooring panel 23, and the like. It is a structure. The floor panel structure 20 is supported by the joist 10 near the wall 30, and is partially supported by the support legs 40 at the center of the room space, whereby the floor panel structure 20 is supported by the concrete slab 35. A state is maintained that is substantially parallel to the upper surface of the concrete slab 35 at a predetermined distance from the upper surface. In the present embodiment, a hollow wood panel having a large number of cavities extending in one direction (in the example of FIG. 2, the direction perpendicular to the plane of FIG. 2) is used as the base panel 22. By using such a hollow wood panel, weight reduction of the floor panel structure 20 is realized and the number of supporting points by the support legs 40 is suppressed, but the structure of the floor panel structure 20 is arbitrary, Various known structures can also be employed.
[0018]
The support leg 40 supports the floor panel structure 20 at a portion other than the wall 30 of the room space defined by the wall 30 and the concrete slab 35. The support legs 40 are suspended between two support panels 40a (four in the case of the corner of the base panel 22) on which the base panel 22 is placed, and hanging downward from the support support member 40a. A bolt member 40b to be rotated, and a vibration isolating rubber 40c provided on the lower end side of the bolt member 40b. The support leg 40 can support the floor panel structure 20 as shown in the figure by disposing the vibration isolating rubber 40c on the upper surface of the concrete slab 35.
[0019]
The edge joist 10 is a member arranged along the wall 30 at the wall 30, and has a function of supporting the floor panel structure 20 at the wall 30. As shown in FIG. 1, the edge joist 10 is a substantially rectangular parallelepiped member extending over almost the entire width of the wall 30, and the extending direction is arranged along the surface of the wall 30. The margin joist 10 is supported by a plurality (five in the illustrated example) of support bodies 38 arranged at predetermined intervals on the concrete slab 35 along the extending direction. The support 38 is made of an elastic body such as rubber. In this way, the floor panel structure 20 is placed on the upper surface 10a of the joist 10 when supported by the concrete slab 35, whereby the joist 10 separates the floor panel structure 20 from the concrete slab 35 by a predetermined distance. Supporting in a different position. Further, by supporting the joist 10 using the support body 38 made of an elastic body such as rubber as described above, when an impact is applied to the floor panel structure 20, the concrete slab 35 is passed through the jojo 10. So that it can absorb more of the shock transmitted to it. In other words, the impact transmitted from the floor panel structure 20 to the joist 10 is absorbed by the support 38 made of an elastic body disposed between the jojo 10 and the concrete slab 35, thereby transmitting the impact to the concrete slab 35. It is possible to suppress the impact.
[0020]
A-2. Tokita
The above is the overall configuration of the dry double floor structure 100 including the joist 10 according to the present embodiment. Next, the jojo 10 provided on the wall 30 in the dry double floor structure 100 will be described in detail. explain. As shown in FIGS. 2 and 3, the joist 10 is a substantially cuboid box-like member in which a cavity S extending substantially in the entire extending direction is formed, and the surface 10b on the chamber space side has the cavity 10 Openings 11a and 11b that are continuous with S are formed. Here, the openings 11a and 11b are respectively formed on both ends of the joist 10 in the extending direction.
[0021]
In the dry double floor structure 100, the floor impact sound to the downstairs of the concrete slab 35 (especially by using the joist 10 having a special structure provided with the cavity S and the openings 11a and 11b as described above) (Low frequency region) transmission can be suppressed. Hereinafter, the reason why such an effect occurs will be described.
[0022]
FIG. 4 is a cross-sectional plan view schematically showing an underfloor space in the vicinity of one wall 30 of a room space provided with the dry double floor structure 100. As shown in the figure, in addition to the function of supporting the floor panel structure 20 in the same manner as a general joister, the konjita 10 has a resonance of an open tube configuration having a length L ′ from the viewpoint of acoustics. It has functions as a body.
[0023]
The resonance frequency fm of such an open tube having a length L 'is theoretically expressed by the following equation.
fm = (mV) / (2L ')
Here, m is the order (natural number), and V is the speed of sound.
[0024]
On the other hand, considering the natural vibration frequency of the underfloor space in the room space partitioned by the wall 30 and the concrete slab 35 in a one-dimensional mode (extending direction of the joist 10 shown in FIG. 4), Fm is theoretically expressed by the following equation.
Fm = (mV) / (2L)
Also in this equation, m is the order (natural number), and V is the speed of sound, as in the equation representing the resonance frequency of the open tube.
[0025]
As described above, the joist 10 in the present embodiment is a member extending over the entire width L of the wall 30, and the joist 10 is formed with a cavity S having a length substantially the same as the length in the extending direction. ing. The joist 10 functions as an open tube resonator when it has a cavity S of this length L ′, that is, a cavity S having a length approximating the full width L of the wall 30. In this way, when the length L and the length L ′ are substantially the same, the theoretical frequency for each order derived by the above two formulas has almost the same value. That is, the joist 10 in the present embodiment functions as an open tube resonator having a resonance frequency band that is substantially the same as the natural vibration frequency in the under-floor space in the room space in which the dry double floor structure 100 is provided. It is.
[0026]
For example, when the sound velocity V is 340 m / s and L and L ′ are 5 m, the resonance frequency f1 of Tokita 10 and the natural vibration frequency F1 (primary to tertiary) of the one-dimensional mode of the underfloor space are as follows. .
Primary (m = 1) 1 × 340 / (2 × 5) = 34 Hz
Secondary (m = 2) 2 × 340 / (2 × 5) = 68 Hz
3rd order (m = 3) 3 × 340 / (2 × 5) = 102 Hz
[0027]
From the above results, when an impact is applied to the floor panel structure 20 (when a person on the floor panel structure 20 jumps or the like), in the room space defined by the wall 30 and the concrete slab 35, It can be seen that the impact sound in the frequency band (low frequency band) in the vicinity of the natural vibration frequency Fm such as 34 Hz, 68 Hz, and 102 Hz becomes a problem. Due to the structure of the room space, the impact sound in the frequency band as described above is a problem, but the impact of floor impact sound on the room below the floor is large in the low frequency region and absorbs the impact sound in these frequency bands. It can be said that this is effective shock absorption. Further, from the above results, the resonance frequency band of the joist 10 that functions as an open tube resonator, in other words, the frequency band in which the most efficient sound absorption and diffusion effect can be obtained by the joist 10 is 34 Hz, 68 Hz, 102 Hz, etc. The frequency band coincides with the natural vibration frequency Fm. Therefore, the dry double floor structure 100 having the joists 10 can effectively absorb and diffuse floor impact sound. In addition, it is possible to suppress the occurrence of standing waves caused by the floor impact sound in the underfloor space being reflected by the wall 30 or the like.
[0028]
Further, in the dry double floor structure 100, the joists 10 having the same length as the entire width of the walls are arranged along the walls of the four walls 30 that divide the room space. Cage (only two are shown in FIG. 1), so that the floor impact sound can be effectively absorbed by the joists 10 at each. Further, when the four joists 10 are provided in this way, the openings 11a and 11b of the jojo 10 are located at the four corner positions in the under floor space of the substantially rectangular parallelepiped room space. As is well known, the sound pressure distribution of the natural vibration in a rectangular parallelepiped room space increases at the corners of the chamber space. In this embodiment, the open tube resonators are provided at the corners where the sound pressure increases. Since the openings 11a and 11b of the joist 10 are positioned when functioning, it is possible to absorb the impact sound due to the natural vibration of the room space more effectively.
[0029]
As described above, in the dry double floor structure 100 including the joist 10 according to the present embodiment, floor impact sound generated in the underfloor space due to the impact applied to the floor panel structure 20 is effectively absorbed. can do. Further, in the present embodiment, when the joist 10 that has been conventionally used to support the floor panel structure 20 is used, the joist 10 that is uniformly manufactured in the above-described configuration in a factory or the like is used. The above-described effective floor impact sound can be absorbed only by performing an easy construction work such as installing instead of a joist in the case of a conventional general solid structure. Therefore, it is not necessary to perform complicated construction such as inserting a damping sheet into the floor panel structure 20.
[0030]
  Further, in the present embodiment, as described above, effective floor impact sound absorption is realized by making the joist structure as described above when used for supporting the floor panel structure 20 conventionally. . Therefore, sound absorption of glass wool etc. on the concrete slab 35NoTherefore, there is no need to newly install a member or apparatus used only for the purpose, and it is possible to obtain an effect that it is not necessary to consider interference with other members such as piping in the underfloor space.
[0031]
A-3. Modification of the first embodiment
(Modification 1)
In the first embodiment described above, the individual joists 10 are arranged along the four walls 30 of the substantially rectangular parallelepiped chamber space. However, as shown in FIG. It is good also as a structure which connects joist 110 at a corner part when installing along. Here, FIG. 6 is a perspective view showing a configuration in the vicinity of the connecting portion of the joists 110 when adjacent to each other. In FIG. 6, in order to clarify the configuration of the connecting portion (corner corner portion of the room space) of the outer joist 110, one outer joist 110 is indicated by a two-dot chain line.
[0032]
As shown in FIG. 5 and FIG. 6, the end portion 110 c in the extending direction of the joist 110 has a shape cut in a taper shape when viewed from above, and is formed on the surface 10 b on the chamber space side at the end portion. Is formed with a substantially rectangular cutout 110a. Further, in the case of the edge joist 110, as in the case of the edge joist 10 in the first embodiment, a cavity S having a length substantially the same as the extending direction of the member is formed, and the end cut in a tapered shape as described above is formed. The portion 110c is an open end. 6 is formed at both ends with a tapered end portion 110c and a notch 110a as shown in FIG. 6, and the end portions 110c of the adjacent joists 110 are connected to each other at the corners of the chamber space. Yes.
[0033]
By connecting the end portions 110c of the adjacent joists 110 adjacent to each other at the corners of the chamber space as described above, the notches 110a of the respective joists 110 are provided at the end portions of the surface 10b on the chamber space side of the jojo 110. Thus, an opening continuous with the cavity S is formed. In other words, openings are formed at the four corners of the room space in the joist 110 when they are arranged and connected along the four walls 30 of the room space. That is, as in the first embodiment, the joist 110 functions as an open tube resonator having the same length as the entire width of each wall 30 that divides the room space, and as in the first embodiment. It is possible to effectively absorb floor impact sound.
[0034]
(Modification 2)
Further, as shown in FIG. 7, various porous materials 200 such as glass wool and urethane foam are disposed so as to cover the openings 11a and 11b formed at the end of the joist 10 in the first embodiment described above. You may make it do. Thus, by covering the openings 11a and 11b of the joist 10 with the porous material 200, when the sound wave in the underfloor space is transmitted to the cavity S of the jojo 10, the openings 11a and 11b Absorbed by the disposed porous material 200. That is, by disposing the porous material 200 in the openings 11a and 11b, the acoustic energy resistance loss of the sound wave when passing through the openings 11a and 11b is increased, thereby further improving the sound absorption effect.
[0035]
(Modification 3)
Further, in the first embodiment described above, the joist 10 is supported on the concrete slab 35 by the substantially rectangular parallelepiped support 38, but the member that supports the joist 10 is limited to this. is not. For example, as shown in FIG. 8, the joist 10 may be supported by a support leg 82 including a bolt member 80 and an anti-vibration rubber (elastic body) 81.
[0036]
(Modification 4)
Further, in the first embodiment described above, the joist 10 functions as an open tube resonator having a length L ′ substantially the same as the full width L of the wall 30, but as shown in FIG. , When functioning as an open tube resonator having a length L ′ / p obtained by dividing the length L of the entire width of the wall 30 by an integer equal to or greater than 2 (hereinafter referred to as p, p = 2 in the illustrated example). A plurality of 'may be arranged along the wall 30. When a plurality of joists 10 'are arranged in this way, the resonance frequencies (first to third) of the joists 10' are as follows. The sound speed is 340 m / s and L = 5 m.
[0037]
Primary (m = 1) 1 × 340 / (2 × 2.5) = 68 Hz
Secondary (m = 2) 2 × 340 / (2 × 2.5) = 136 Hz
3rd order (m = 3) 3 × 340 / (2 × 2.5) = 204 Hz
[0038]
In other words, the resonance frequency of the primary mode of Tokita 10 'coincides with the natural vibration frequency of the secondary mode of the room space, and sound waves in the vicinity of this frequency band can be efficiently absorbed. Similarly, the resonance frequency of the second mode of the joist 10 'coincides with the natural vibration frequency of the fourth mode of the room space, and sound waves in the vicinity of this frequency band can be efficiently absorbed.
[0039]
(Modification 5)
Further, in the first embodiment described above, the openings 11a and 11b connected to the cavity S are formed on the surface 10b of the edge joist 10. However, as shown in FIG. Opening portions 91a and 91b connected to the cavity S may be formed on both end surfaces 90a and 90b of the first and second end surfaces 90a and 90b. The space is not cut off, and sound waves can be transmitted from the chamber space toward both end faces 90a and 90b. Therefore, by providing the openings 91a and 91b in such a part, it is possible to absorb the floor impact sound using the resonance action similar to that of the first embodiment.
[0040]
(Modification 6)
Further, instead of the joist 10 in the first embodiment described above, a joist 210 having a structure as shown in FIG. 11 may be used. As shown in the figure, in this case, the joist 210 has a large number of small holes 211 formed on the surface 10b on the chamber space side, and these holes 211 are scattered over almost the entire area of the surface 10b. In addition, these holes 211 are connected to the cavity S extending in the extending direction (direction along the wall 30) of the joist 210 in the same manner as the jojo 10 described above. In other words, the joist 210 functions as a Helmholtz resonator having the hole 211 and the cavity S in addition to the function of supporting the floor panel structure 20. Therefore, similarly to the first embodiment described above, the floor impact sound in the underfloor space can be effectively absorbed.
[0041]
In addition, since the joist 210 is provided with a large number of holes 211 having a small opening area in the surface 10b, the resistance when sound waves pass through the holes 211 increases, and there are a large number of such holes 211. Therefore, the acoustic energy in the underfloor space can be greatly attenuated by the frictional resistance.
[0042]
B. Second embodiment
Next, a floor structure having joists according to the second embodiment of the present invention will be described with reference to FIGS. Note that in the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
[0043]
In the first embodiment described above, the hollow joist 10 is formed with the cavity S extending in the extending direction. However, the hot jojo 310 in the second embodiment is a wall from the surface 310a on the room space side. A plurality of cavities SA extending in the direction of the surface 310b on the 30th side are formed side by side in the direction in which the joist 310 extends.
[0044]
As shown in FIG. 13, unlike the joist 10, the jojo 310 is basically a solid structure, but as described above, it is a substantially rectangular parallelepiped-shaped cavity along the extending direction of the jojo 310. A plurality of SAs are formed. These cavities SA are connected to a substantially rectangular opening 311a formed on the surface 310a on the chamber space side, while the cavities SA are also connected to an opening 311b formed on the surface 310b on the wall 30 side. That is, the cavity SA penetrates from the surface 310a to the surface 310b.
[0045]
In this way, by providing the outer joist 310 with the cavity SA connected to the opening 311a provided on the surface 310a on the room space side, compared with the case where the joist is installed in the solid structure of the conventional substantially rectangular parallelepiped shape, The unevenness of the reflection surface of the floor impact sound generated in the underfloor space is large, so that it is possible to absorb more floor impact sound and to scatter the sound. Therefore, it is possible to suppress the floor impact sound due to the impact applied to the floor panel structure 20 from being transmitted to the downstairs.
[0046]
As shown in FIG. 14, various known porous materials 350 such as glass wool, rock wool, diatomaceous earth, and sawdust are inserted and disposed in each cavity SA of the joist 310 in the second embodiment. The floor impact sound may be further absorbed.
[0047]
Further, the shape of the cavity SA formed by the joist 310 is not limited to the substantially rectangular parallelepiped shape as described above, and other shapes, for example, a cylindrical cavity may be formed, and are arbitrary. .
[0048]
Further, the joist 310 does not need to be a substantially rectangular parallelepiped member as described above, and may have another shape, for example, a shape shown in FIG. 15 as long as it has a function of supporting the floor panel structure 20. There may be. As shown in the figure, the joist 310 ′ has irregularities formed on the upper surface portion thereof, and a cavity SA is formed in a portion corresponding to the convex portion. Even in such a shape, the floor panel structure 20 can be supported, and the same sound absorption / diffusion effect as the joist 310 can be obtained.
[0049]
Further, as shown in FIG. 16, a support leg 330 may be used in place of the substantially rectangular parallelepiped support 38 in the above-described embodiment as a structure for supporting the joist 310 or the jojo 310 '. The support leg 330 includes a bolt member 330 a and a vibration-proof rubber 330 b that is attached to the lower end side of the bolt member 330 a and is placed on the concrete slab 35. When supporting the joist 310 ′ with the support leg 330 having such a configuration, a screw hole 320 is formed in the joist 310 ′, and the upper end side of the bolt member 330a is screwed into the screw hole 320, thereby supporting the support leg 310 ′. 330 and the joist 310 'may be combined. By doing so, the height adjustment of the joist 310 ′ at the time of construction can be performed by a simple operation such as adjusting the screwing position of the bolt member 330 a with respect to the screw hole 320.
[0050]
C. Third embodiment
Next, a floor structure provided with a joist structure according to a third embodiment of the present invention will be described with reference to FIGS. 17 and 18. Note that, in the third embodiment, components common to the first embodiment and the second embodiment are denoted by the same reference numerals, and description thereof is omitted.
[0051]
The outer joist structure 470 in the third embodiment has an outer joist 410 having a substantially rectangular parallelepiped shape. In the margin joist 410, a plurality of cavities SA extending in the direction from the chamber space side surface 410a to the wall 30 side surface 410b are arranged side by side in the direction in which the margin joist 410 extends, as in the second embodiment. Has been.
[0052]
As shown in FIG. 18, the cavity SA formed in the joist 410 is a substantially quadrangular prism-shaped cavity, and a fitting member 450 having substantially the same shape (square prism) as the cavity SA is fitted in the cavity SA. Has been. Here, when the cavity SA is formed, the joist 410 and the fitting member 450 are made of materials having different densities. In the present embodiment, the material constituting the fitting member 450 constitutes the joist 410. A material having a density smaller than that of the material to be used is used. The thick joist structure 470 is composed of the joist 410 and the fitting member 450 made of materials having different densities.
[0053]
In the floor structure having the joist structure 470 in the above configuration, when an impact or the like is applied to the floor panel structure 20, the impact is transmitted from the portion of the wall 30 of the floor panel structure 20 to the joist structure 470. The Thus, the impact transmitted to the marginal joist structure 470 is transmitted from the upper side to the lower side of the marginal joist structure 470 and is transmitted to the concrete slab 35 via the support 38.
[0054]
Here, paying attention to the vertical configuration of the paddle structure 470, the paddle structure 470 has a laminated structure such as the paddle 410 in the upper layer, the fitting member 450 in the middle layer, and the paddle 410 in the lower layer again. It can be seen (see the cross-sectional portion of FIG. 18). Therefore, when an impact is transmitted from the upper side to the lower side of the outer joist structure 470 as described above, the impact (vibration) is changed from the upper layer (interjosh 410) to the middle layer (insertion member 450), and the middle layer ( It is transmitted from the fitting member 450) through a boundary layer such as a lower layer (Kitajo 410). As described above, the joist 410 and the fitting member 450 have different densities, that is, the upper layer and the middle layer, and the middle layer and the lower layer have different densities, so that the acoustic impedance of each layer is also different. Therefore, when the impact vibration is propagated from the upper side to the lower side of the joist structure 470 as described above, the energy is attenuated at the boundary surface of each layer, thereby reducing the vibration transmitted to the concrete slab 35. It can be done.
[0055]
【The invention's effect】
As described above, according to the present invention, floor impact sound can be effectively absorbed without being restricted by interference with other members in the underfloor space and without complicating construction work. Can do.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an overall configuration of a floor structure having a joist according to a first embodiment of the present invention.
FIG. 2 is a side sectional view showing a configuration in the vicinity of a wall of the floor structure.
FIG. 3 is a perspective view showing the joist.
FIG. 4 is a diagram for explaining an impact sound absorbing effect by the floor structure provided with the joist.
FIG. 5 is a perspective view showing an entire configuration of a floor structure having a joist according to a modification of the first embodiment.
FIG. 6 is a perspective view showing the vicinity of a connecting portion of a joist according to the modified example.
FIG. 7 is a side sectional view showing a configuration in the vicinity of a wall of a floor structure having a joist according to another modification of the first embodiment.
FIG. 8 is a side sectional view showing a configuration in the vicinity of a wall of a floor structure having a joist according to another modification of the first embodiment.
FIG. 9 is a plan view schematically showing a configuration of a floor structure having a joist according to still another modification of the first embodiment.
FIG. 10 is a plan view schematically showing a configuration of a floor structure having a joist according to still another modification of the first embodiment.
FIG. 11 is a perspective view showing a joist according to still another modification of the first embodiment.
FIG. 12 is a perspective view showing an overall configuration of a floor structure having a joist according to a second embodiment of the present invention.
FIG. 13 is a perspective view showing a joist according to the second embodiment.
FIG. 14 is a perspective view showing a joist according to a modification of the second embodiment.
FIG. 15 is a perspective view showing an overall configuration of a floor structure having a joist according to another modification of the second embodiment.
FIG. 16 is a view for explaining a modification of the joist support structure according to another modification of the second embodiment;
FIG. 17 is a perspective view showing an overall configuration of a floor structure including a joist structure according to a third embodiment of the present invention.
FIG. 18 is a perspective view showing a joist structure according to the third embodiment.
[Explanation of symbols]
10... Nekita, 10 '... Nekita, 10 ". Slab, 38 ... support, 40 ... support leg, 81 ... anti-vibration rubber, 90a, 90b ... both end faces, 91a, 91b ... opening, 100 ... dry double floor structure, 110 ... Bound joist, 110a ... Notch, 110c ... End, 200 ... Porous material, 82 ... Support leg, 210 ... Bound joist, 211 ... Hole, 310 ... Bound joist, 310 '... Bound Joist, 310a ... face, 310b ... face, 311a ... opening, 311b ... opening, 320 ... screw hole, 330 ... support leg, 330a ... bolt member, 330b ... vibration proof rubber, 350 …… Porous material, 410 …… Jones, 410a …… Surface, 410b ... surface, 450 ...... fitting insertion member, 470 ...... when joists structure, S ...... cavity, SA ...... cavity

Claims (11)

A floor joist structure that supports a floor material arranged at a predetermined distance above the floor base by a wall that constitutes the room space,
Comprising a joist member when extending along the front Kikabe,
Wherein when the joists member, wherein the surface facing the wall opening is formed on the opposite side, and that have empty dong continuing to the opening is formed
Joist structure when you characterized a call. A floor joist structure that supports a floor material arranged at a predetermined distance above the floor base by a wall that constitutes the room space,
A joist member extending along substantially the entire width of the wall along the wall ;
The joist member has an opening formed at least on one end side in the extending direction along the wall, and a cavity is formed over substantially the entire length in the extending direction continuously to the opening . joist structure when you wherein a. The time and have contact to the joists member, on the surface opposite to the surface facing the said wall, joists structure upon claim 1, wherein a plurality of openings communicating with the cavity is formed body. A floor joist structure that supports a floor material arranged at a predetermined distance above the floor base by a wall that constitutes the room space,
Comprising a joist member when extending along the front wall,
Wherein when the joists member, characterized in that there is formed a opening on the opposite side, and a cavity extending into the opening or al the wall is formed from the surface facing the said wall When the joist structure. The joist structure according to any one of claims 1 to 4, further comprising a porous material disposed so as to cover the opening . A flooring disposed at a predetermined distance above the floor base;
A support leg provided on the floor base and supporting the flooring;
Extend along the walls constituting the chamber space, comprising a joist in supporting the flooring,
Wherein when the joists, wherein the surface facing the wall opening is formed on the opposite side, and that have empty dong continuing to the opening is formed
Floor structure, wherein a call. A flooring disposed at a predetermined distance above the floor base;
A support leg provided on the floor base and supporting the flooring;
Extends over substantially the entire width of the front Kikabe along the walls constituting the chamber space, comprising a joist in supporting the flooring,
The joist has an opening formed on at least one end side in the extending direction along the wall, and a cavity is formed over substantially the entire length in the extending direction in connection with the opening . floor structure characterized. The time and have contact to the joists, on the surface opposite to the surface facing the said wall, floor structure according to claim 6, wherein a plurality of openings communicating with the cavity is formed. A flooring disposed at a predetermined distance above the floor base;
A support leg provided on the floor base and supporting the flooring;
Extending along the wall that constitutes the chamber space comprises a Saine thick for supporting the flooring,
Wherein when the joists, and characterized in that there is formed a opening on the opposite side, and a cavity extending into the opening or al the wall is formed from the surface facing the said wall Floor structure. The floor structure according to any one of claims 6 to 9, further comprising a porous material disposed so as to cover the opening. Before provided on Kiyuka foundation, floor structure according to any one of claims 6 to 1 0, characterized by further comprising an elastic support for supporting joists when the.

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