Inter-story structure

Abstract

To provide an inter-story structure by a framework wall construction method, capable of reducing noise due to vibration on an upper floor to reduce noise from the upper floor to lower floors.SOLUTION: An inter-story structure comprises: an underfloor frame body 2 arranged on a lower floor wall panel 1 and assembled with floor joist material; floor plywood 3 laid on the top surface of the underfloor frame body 2; an upper floor wall panel 4 arranged on the floor plywood 3 above the lower floor wall panel 1; a three-dimensional net-like structure body 5 laid on the top surface of the floor plywood 3; and a floor substrate material 6 laid on the three-dimensional net-like structure body 5, wherein the upper floor wall panel 4 has a lower frame 4a, which has, on its bottom surface, a groove-like ventiduct 4b extending in a width direction of the lower frame 4a to communicate with the three-dimensional net-like structure body 5.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an inter-story structure using a wood-frame construction method. [Background technology]

[0002] Conventionally, in order to reduce noise caused by vibrations from the floor above being transmitted to the floor below, vibration-isolating hangers have been used to prevent vibrations from the floor above from being transmitted to the ceiling wall of the floor below (for example, Patent Document 1, etc.). Other commonly known methods include filling the spaces between the floor joists with sound-absorbing materials such as glass wool or rock wool, or pouring cylindrical concrete or mortar on top of the floor plywood or laying thin ALC panels to further improve sound insulation. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2001-107503 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the case of monocoque structures constructed using frame wall construction, soundproofing measures such as vibration-proof hanging beams and conventional sound-absorbing materials alone have not yet been sufficient to prevent noise from traveling from the upper floors to the lower floors.

[0005] SUMMARY OF THE INVENTION Therefore, the main object of the present invention is to provide an inter-story structure using a wood frame construction method that can enhance the effect of reducing noise from upper floors to lower floors. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, one embodiment of the inter-floor structure of the present invention comprises a subfloor frame body arranged on a lower floor wall panel and assembled with joists, floor plywood laid on the upper surface of the subfloor frame body, an upper floor wall panel arranged on the floor plywood above the lower floor wall panel, a three-dimensional mesh structure laid on the upper surface of the floor plywood, and a floor underlayment material laid on the three-dimensional mesh structure, wherein the upper floor wall panel has a lower frame, and the lower frame has a groove-shaped ventilation channel on the bottom surface of the lower frame that extends in the width direction of the lower frame and communicates with the three-dimensional mesh structure.

[0007] The ventilation channel may be a groove formed in the bottom surface of the lower frame.

[0008] The air passage may be the space between a plurality of protrusions fixed at intervals to the bottom surface of the lower frame.

[0009] The protrusion may be an asphalt-based vibration-damping material fixed to the bottom surface of the lower frame via double-sided tape.

[0010] The three-dimensional network structure may comprise a mat-like body formed by fused and entangled polymer filaments, and a moisture-permeable waterproof sheet bonded to the outer surface of the mat-like body.

[0011] The joist members may have end joists, side joists, and floor joists, and the height dimension of the floor joists may be shorter than the height dimensions of the end joists and the side joists.

[0012] Furthermore, the floor structure further comprises ceiling panels, ceiling joists to which the ceiling panels are fixed, elastic retaining members that hold the ceiling joists, and support members that are fixed to the joists that intersect with the ceiling joists and support the elastic retaining members, the elastic retaining members having rubber elasticity and having a bottom edge that abuts the bottom surface of the ceiling joist, a pair of side edges that extend from both ends of the bottom edge and abut on both side surfaces of the ceiling joist, and a pair of upper edges that extend inward from the pair of side edges and abut on both sides of the upper surface of the ceiling joist, and the ceiling panels can be fixed to the ceiling joist via the bottom edges of the elastic retaining members.

[0013] The support member is formed from a metal plate and comprises a fixed portion fixed to the joist material that intersects with the ceiling joist, and a receiving portion connected to the fixed portion and receiving the ceiling joist, the receiving portion comprising a pair of legs extending from the lower end of the fixed portion, a pair of support pieces extending horizontally and parallel from each of the pair of legs and on which the elastic retaining member is placed, and a locking portion erected on the support pieces and capable of abutting the elastic retaining member, and is configured so that the ceiling joist can be inserted between the pair of legs, and the bottom edge of the elastic retaining member may protrude downward from between the pair of support pieces and have a convex portion that abuts against the ceiling board.

[0014] the support member is formed of a wooden board, and a notched recess for holding the elastic holding member is formed at a lower end of the support member, the notched recess abutting against outer surfaces of the pair of side edges of the elastic holding member and being formed to support a lower portion of the elastic holding member from both sides, The bottom side of the elastic holding member may have a protrusion that protrudes downward from the notched recess and abuts against the ceiling plate.

[0015] The notched recess may be formed in an arc shape with a central angle of 270° or more, and the outer surfaces of a pair of side edges of the elastic holding member may be formed to abut along the inner peripheral surface of the arc shape of the notched recess.

[0016] The support member may be fixed via a buffer material.

[0017] A packing material may be interposed between the floor plywood and the underfloor frame. [Effects of the Invention]

[0018] According to the present invention, air vibrations caused by vibrations in the underfloor material pass through the voids that communicate in three dimensions in the three-dimensional network structure and then pass through the ventilation passages in the lower frames of the upper-floor wall panels to be released to the outside, thereby improving the soundproofing effect of vibration noise from the upper floors to the lower floors. In addition, the cushioning properties of the three-dimensional network structure allow the three-dimensional network structure to act as a shock absorber, absorbing vibrations and thereby improving the soundproofing effect of vibration noise from the upper floors to the lower floors.

[0019] In addition, since the ceiling panels are suspended via elastic retaining members, vibrations transmitted from the floor plywood to the ceiling panels are damped by the elastic retaining members, thereby reducing noise such as impact sounds transmitted from upper floors to lower floors.

[0020] Furthermore, by making the height of the floor joists shorter than that of the end and side joists, air can flow beneath the floor joists within the frame formed by the end and side joists. As a result, air vibrations caused by the so-called drumming phenomenon are alleviated, and noise such as impact sounds transmitted from upper floors to lower floors is reduced.

[0021] Furthermore, by providing a gasket between the floor plywood and the underfloor frame, noise such as impact sounds transmitted from the upper floor to the lower floor can be reduced. [Brief explanation of the drawings]

[0022] [Figure 1] FIG. 1 is a cross-sectional view showing an inter-floor structure according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a perspective view showing the lower frame of the upper floor wall panel of FIG. 1. [Figure 3] FIG. 3 is a perspective view showing a modified example of the lower frame of FIG. 2. [Figure 4] 4 is a perspective view showing one embodiment of a protrusion adhered to the lower frame of FIG. 3. FIG. [Figure 5] FIG. 2 is a partially enlarged view of the three-dimensional network structure of FIG. [Figure 6] 1 is a perspective view showing a floor frame body provided with support members, elastic retaining members, and ceiling joists, which are components of the first embodiment of the floor structure of the present invention; [Figure 7] 2A and 2B show the support member of FIG. 1, in which FIG. 2A is a front view and FIG. 2B is a side view. [Figure 8] 2A and 2B show the elastic holding member of FIG. 1, with (a) being a front view and (b) being a side view. [Figure 9] 2A and 2B show a state in which a ceiling joist is held by the elastic holding member of FIG. 1, where (a) is a front view and (b) is a side view. [Figure 10]10 is a perspective view showing a state in which a ceiling joist is held by the elastic holding member of FIG. 9. FIG. [Figure 11] 10 is a perspective view showing the process of fitting an elastic retaining member into a ceiling joist. FIG. [Figure 12] 10 is a perspective view showing the process of fixing a support member to a floor joist and suspending a ceiling joist with an elastic retaining member attached to the support member. FIG. [Figure 13] FIG. 1 is a perspective view showing the process of attaching a packing to the underfloor frame body. [Figure 14] FIG. 7 is a perspective view showing the state in which glass wool has been partially laid on the underfloor frame of FIG. 6. [Figure 15] FIG. 8 is a perspective view showing the process of attaching floor plywood and ceiling panels to the underfloor frame of FIG. 7. [Figure 16] FIG. 2 is a longitudinal sectional front view showing the main parts of a second embodiment of the floor structure according to the present invention. [Figure 17] FIG. 2 is a longitudinal sectional front view showing the main parts of a second embodiment of the floor structure according to the present invention. [Figure 18] FIG. 2 is a perspective view showing a main part of the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0023] Embodiments of the floor structure according to the present invention will be described below with reference to Figures 1 to 18. In all the figures and all the embodiments, the same or similar components are designated by the same reference numerals.

[0024] First, a first embodiment of the inter-floor structure according to the present invention will be described with reference to Figures 1 to 15. Referring to Figure 1, the inter-floor structure of the first embodiment comprises an underfloor frame 2 arranged on a lower floor wall panel 1, floor plywood 3 laid on the upper surface of the underfloor frame 2, an upper floor wall panel 4 arranged on the floor plywood 3 above the lower floor wall panel 1, a three-dimensional network structure 5 laid on the upper surface of the floor plywood 3, and an underfloor material 6 laid on the three-dimensional network structure 5.

[0025] The lower floor wall panel 1 and the upper floor wall panel 4 are pre-panels used in the wood-frame construction method (2x4 construction method). In FIG. 1, reference numeral 1a denotes the top joint of the lower floor wall panel 1, reference numeral 1b denotes the upper frame of the lower floor wall panel 1, reference numeral 1c denotes the vertical frame of the lower floor wall panel 1, and reference numeral 1d denotes a structural panel that constitutes a load-bearing wall. The lower frame 4a of the upper floor wall panel 4 has a groove-shaped air passage 4b ​​on its bottom surface. The air passage 4b ​​extends in the width direction (W direction) of the lower frame 4a and communicates with the voids in the three-dimensional network structure 5. In FIG. 1, reference numeral 4c denotes the vertical frame of the upper floor wall panel 4, and reference numeral 4d denotes a structural panel that constitutes the load-bearing wall of the upper floor wall panel 4. The structural panel 4d of the upper floor wall panel 4 is attached so as not to block the air passage 4b. In the illustrated example, the lower frame 4a of the upper floor wall panel 4 is composed of two stacked boards.

[0026] The groove-shaped ventilation passage 4b ​​can be formed by cutting the bottom surface of the lower frame 4a, as shown in Figure 2, or multiple protrusions 4c can be attached to the bottom surface of the lower frame 4a at intervals to form the ventilation passage 4b, as shown in Figure 3. For example, as shown in Figure 4, multiple protrusions 4c made of rectangular asphalt-based vibration-damping material can be attached to the bottom surface of the lower frame 4a at intervals on double-sided tape 4e. Known asphalt-based vibration-damping material can be used. The protrusions 4c can also be formed from packing material.

[0027] Referring to FIG. 5, the three-dimensional mesh structure 5 comprises a mat-like body 5b formed by fused and entangled polymer filaments 5a, and a moisture-permeable waterproof sheet 5c attached to the outer surface of the mat-like body 5b.

[0028] The mat-like body 5b is preferably made of polyethylene, but can also be made of other thermoplastic resins, such as polypropylene, polyvinyl chloride, polystyrene, polyvinyl acetate, polytetrafluoroethylene, and acrylonitrile butadiene styrene resin, either alone or in combination. It can also be made of a structure in which rubber-elastic elastomer fibers, such as polyether ester, are connected in a three-dimensional manner, forming numerous loops. An example of such a structure is BreathAir (registered trademark) manufactured by Toyobo MC Co., Ltd. The moisture-permeable waterproof sheet 5c can also be made of a thermoplastic resin, such as polyethylene. An example of a moisture-permeable waterproof sheet 5c is Tyvek (registered trademark).

[0029] The thickness of the mat-like main body 5b of the three-dimensional network structure 5 can be, for example, 2 to 15 mm. The thickness of the moisture-permeable waterproof sheet 5c is, for example, 1 mm or less.

[0030] Referring to FIG. 1, in the illustrated example, ALC boards are used as the underfloor material 6. A gap G is provided between the underfloor material 6 and the upper floor wall panel 4 to prevent solid-state vibration propagation. The width of the gap G is, for example, 2 to 10 mm. Cylinder concrete or mortar can also be used as the underfloor material 6. In the case of wet construction using cylinder concrete or mortar as the underfloor material 6, it is preferable that the three-dimensional network structure 5 includes a moisture-permeable waterproof sheet 5c. However, in the case of dry construction using ALC boards as the underfloor material 6, the three-dimensional network structure 5 may be formed only by a mat-like main body 5b formed by fused and entangled polymer filaments 5a, and may not include the moisture-permeable waterproof sheet 5c. Although not shown, a floor finish material is applied on top of the underfloor material 6.

[0031] For example, structural plywood or structural panels having a thickness of 12 to 30 mm can be used as the floor plywood 3. The floor plywood 3 is nailed to the underfloor frame 2.

[0032] Referring to Figure 6, the underfloor frame 2 is assembled from joist members, namely, end joist 2a, brace 2b, side joist 2c, auxiliary joist 2d, floor joist 2e, and support member 2f, and these joist members are connected to the frame by joist support brackets 2g and connecting brackets 2h. To increase rigidity against vertical loads and horizontal structural surfaces, two floor joists 2e are stacked on top of each other. The end joists 2a, brace 2b, and floor joists 2e intersect with the ceiling joist 7, while the side joists 2c, auxiliary joists 2d, and support member 2f are arranged parallel to the ceiling joist 7.

[0033] The end joist 2a and the side joist 2c have the same height, but as shown in FIG. 1, the floor joist 2e has a height H1 that is shorter than the height H2 of the end joist 2a. This allows a wide gap X to be formed between the floor joist 2e and the ceiling board 9. In the illustrated example, so-called two-by-six lumber (38 mm thick × 140 mm wide (height)) is used for the floor joist 2e, and two-by-eight lumber (38 mm thick × 184 mm wide (height)) is used for the end joist 2a and the side joist 2c. In the illustrated example, the length of the end joist 2a is 1820 mm, and the length of the side joist 2c is 3640 mm. The size of the joists can be appropriately selected from known two-by lumber types.

[0034] Support members 8a are nailed to the end joists 2a and floor joists 2e, and elastic retaining members 8b are supported by the support members 8a, and the elastic retaining members 8b hold the ceiling joist 7. If necessary, the support members 8a are fixed to the anti-roll bar 2b via splice plates 8c (Fig. 1) that serve as spacers.

[0035] 1, 6-13, the support member 8a is formed of a metal plate and includes a plate-like fixed portion 8a1 (FIG. 7) that is fixed to floor joists (floor joist 2e, end joist brace 2b) that intersect with the ceiling joist 7, and a receiving portion 8a2 that is connected to the fixed portion 8a1 and receives the ceiling joist 7. The receiving portion 8a2 includes a pair of legs 8a3, 8a4 that extend below the fixed portion 8a1, a pair of support pieces 8a5, 8a6 that extend horizontally and parallel from each of the pair of legs 8a3, 8a4 and on which the elastic retaining member 8b is placed, and locking portions 8a7, 8a8 that are erected on each of the support pieces 8a5, 8a6 and can abut against the elastic retaining member 8b. The pair of legs 8a3, 8a4 have a gap Y between them that allows the ceiling joist 7 to be inserted therethrough. Nail holes 8a9 are formed in the fixed portion 8a1, and the fixed portion 8a1 is nailed to the slip stopper 2b and the floor joist 2e through the nail holes 8a9. A positioning notch 8a10 is formed in the center of the top piece of the fixed portion 8a1. Referring to Figure 9, the height H3 of the locking portions 8a7, 8a8 is set to be smaller than the height H4 of the gap between the fixed portion 8a1 and the ceiling joist 7.

[0036] As shown in FIG. 1, the support member 8a is fixed to the floor joist 2e and the end joist anti-roll bar 2b via shock absorbers 10 for absorbing vibrations. The shock absorbers 10 may be sheet-shaped butyl rubber shock absorbers or other known shock absorbers. The shock absorbers 10 may have adhesive on both sides. The shock absorbers 10 may be attached to the support member 8a in advance.

[0037] 8 to 12, elastic retaining member 8b has a bottom edge 8b1 that abuts against the bottom surface of ceiling joist 7, a pair of side edges 8b2, 8b3 that extend from both ends of bottom edge 8b1 and abut against both side surfaces of ceiling joist 7, and a pair of top edges 8b4, 8b5 that extend inward from the pair of side edges 8b2, 8b3 and abut against both sides of the upper surface of ceiling joist 7.

[0038] When attaching the ceiling joist 7 to the elastic retaining member 8b, the pair of side edges 8b2, 8b3 can be curved to increase the distance between the pair of upper edges 8b4, 8b5, and the ceiling joist 7 can be inserted between the pair of upper edges 8b4, 8b5, as shown in Figure 11. Alternatively, the elastic retaining member 8b can be inserted from the longitudinal end of the ceiling joist 7 and slid to a predetermined position.

[0039] The elastic retaining member 8b inserted into the ceiling joist 7 holds the ceiling joist 7 by a pair of top edges 8b4, 8b5, a pair of side edges 8b2, 8b3, and a bottom edge 8b1, and in this state, it can be placed on the support member 8a and fitted in as shown in Figure 12. The elastic retaining member 8b placed on the support member 8a is locked by locking portions 8a7, 8a8 to prevent it from falling.

[0040] 1, the ceiling board 9 is nailed and fixed to the ceiling joist 7 via the bottom side 8b1 of the elastic retaining member 8b. Referring to FIGS. 8 to 10, the bottom side 8b1 of the elastic retaining member 8b protrudes downward from between the pair of support pieces 8a5, 8a6 of the support member 8a and has a protrusion 8b6 that abuts against the ceiling board 9. As a result, the ceiling board 9 is nailed and fixed to the ceiling joist 7 while abutting against the elastic retaining member 8b, without abutting against the support member 8a, and the elastic retaining member 8b can function as a buffer material between the ceiling joist 7 and the ceiling board 9. The ceiling board 9 is made of a material such as gypsum board.

[0041] As shown in Figures 1 and 14, fire-retardant material 11 can be disposed within the underfloor frame 2. Rock wool, glass wool, or the like can be used as the fire-retardant material 11. The fire-retardant material 11 is preferably disposed in a position close to the upper floor, which is the sound source, and can be supported by a support material 12 at the top of the underfloor frame 2, or the fire-retardant material 11 can be fixed to the floor plywood 3. The support material 12 is not limited to a support bracket as shown in the illustration, and can be any material that can support the fire-retardant material 11.

[0042] A strip-shaped packing material 13 (FIGS. 1, 13-15) is interposed between the floor plywood 3 and the underfloor frame 2. The material of the packing material 13 is not particularly limited, but it can be an asphalt plate, vibration-isolating rubber, or plastic material, which have excellent sound insulation and vibration damping properties. Preferably, a nonwoven fabric-asphalt laminate made by laminating an elastic nonwoven fabric and an asphalt plate can be used. The packing material 13 can be provided with an adhesive sheet (not shown) that is adhered to the underfloor frame 2. The floor plywood 3 is nailed to the underfloor frame 2 via the packing material 13. It is also possible to omit the packing material 13 and nail the floor plywood 3 directly to the underfloor frame 2.

[0043] Referring to Figure 1, plywood 2j of the same thickness as the structural paneling 1d, 4d is fixed to the outer surface of the underfloor frame 2 (in the illustrated example, the outer surface of the end joist 2a). The plywood 2j can be installed at the construction site. Vertically extending ventilation furring strips 14 are fixed at horizontal intervals to the structural paneling 1d, 4d and the plywood 2j, and siding boards 15 are fixed to the ventilation furring strips 14. A ventilation layer V is formed by the gaps between adjacent ventilation furring strips 14.

[0044] As described above, by reinforcing the subfloor frame 2 with two floor joists 2e stacked on top of each other, the floor plywood 3 laid side by side on the subfloor frame 2 and nailed to it does not need to be jointed, but can be installed by butting adjacent floor plywood 3 together using a jib joint. As a result, the floor plywood 3 can be assembled in a factory as a pre-panel with the floor plywood 3 laid and fixed to the subfloor frame 2, and then installed on-site. Furthermore, since the processing required for jointing the floor plywood 3 is eliminated, material processing costs and processing man-hours can be reduced, and the work of attaching the floor plywood 3 to the subfloor frame 2 at the construction site can be omitted, thereby reducing construction man-hours. If fire-retardant material 11 is provided, the fire-retardant material 11 is also incorporated into the pre-panel.

[0045] In the inter-floor structure configured as described above, by interposing the three-dimensional network structure 5 between the floor plywood 3 fixed on the underfloor frame 2 and the underfloor material 6, air vibrations caused by the vibration of the underfloor material 6 pass through the voids that communicate in the three-dimensional direction of the three-dimensional network structure, as shown by the dashed arrows in Figure 1, then pass through the air passage 4b ​​in the lower frame of the upper floor wall panel 4, and further pass through the air passage V between the siding board 15 and the structural surface material 4d, and are released outdoors, thereby improving the soundproofing effect of vibration noise from the upper floor to the lower floor. In addition, the cushioning properties of the three-dimensional network structure 5 act as a shock absorber, absorbing vibrations and thereby improving the soundproofing effect of vibration noise from the upper floor to the lower floor.

[0046] Furthermore, by suspending the ceiling board 9 via the elastic retaining member 8b, vibrations transmitted from the floor plywood 3 to the ceiling board 9 are attenuated by the elastic retaining member 8b, thereby reducing noise such as impact sounds transmitted from the upper floor to the lower floor.

[0047] Furthermore, by making the height H1 of the floor joists 2e shorter than the height H2 of the end joists 2a and side joists 2c, air can flow beneath the floor joists 2e within the frame formed by the end joists 2a and side joists 2c. As a result, air vibrations caused by the so-called drumming phenomenon are alleviated, and noise such as impact sounds transmitted from upper floors to lower floors can be reduced.

[0048] In addition, by providing gasket material 13 between the floor plywood 3 and the underfloor frame 2, vibrations transmitted from the underfloor material 6 to the underfloor frame 2 are absorbed, thereby reducing noise such as impact sounds transmitted from the upper floor to the lower floor.

[0049] Next, a second embodiment of the inter-floor structure according to the present invention will be described with reference to Figures 16 to 18. The inter-floor structure of the second embodiment differs from the first embodiment in the configuration of the support members and elastic retaining members, but the other configurations are the same as those of the first embodiment.

[0050] 16 to 18, the support member 8a of the second embodiment is formed from a wooden board, and a notched recess 8e for holding the elastic retaining member 8b is formed at its lower end by cutting. The notched recess 8e abuts against the outer surfaces of a pair of side edges 8b2, 8b3 of the elastic retaining member 8b and protrudes inward to support the lower part of the elastic retaining member 8b from both sides. The bottom edge 8b1 of the elastic retaining member 8b has a protrusion 8b6 that protrudes downward from the notched recess 8e and abuts against the ceiling board 9. The notched recess 8e is preferably arc-shaped as shown in the illustration, and the central angle α is preferably 270° or greater. The support member 8a is fixed to the floor joists 2e and the safety braces 2b that intersect with the ceiling joist 7.

[0051] The elastic retaining member 8b of the second embodiment is formed from a rubber material such as ethylene propylene rubber, and as shown in Figures 17 and 18, can be shaped like a lip groove or a C-groove to receive and hold the ceiling joist 7. A pair of side edges 8b2, 8b3 of the elastic retaining member 8b can have outer surfaces shaped (arcuate in the illustrated example) to abut along the arc-shaped inner circumferential surface of the notched recess 8e. The bottom edge 8b1 of the elastic retaining member 8b has a protrusion 8b6 that protrudes downward from the lower opening of the notched recess 8e. A ceiling panel 9 is fixed to the ceiling joist 7 by nailing it via the protrusion 8b6.

[0052] The elastic retaining member 8b is supported by the floor joist 2e by fitting the elastic retaining member 8b into the cutout recess 8e of the support member 8a, which reduces costs compared to the support member 8a of the first embodiment.

[0053] The present invention should not be construed as being limited to the above-described embodiment, and various modifications are possible within the scope of the present invention. [Explanation of symbols]

[0054] 1 Lower floor wall panel 2 Underfloor frame 2a end joist 2c side joist 2e floor joist 3. Floor plywood 4 Upper floor wall panels 5 Three-dimensional network structure 6. Underfloor materials 7 Ceiling veranda 8a Support member 8a1 Fixed part 8a2 Receiving part 8a3, 8a4 legs 8a5, 8a6 support piece 8a7, 8a8 Locking part 8b Elastic holding member 8b1 bottom 8b2, 8b3 side 8b4,8b5 top 8b6 convex part 8d Lower open part 8e Arc-shaped hole 9 Ceiling Panels 10 Cushioning material 11 Fire protection materials 13 Packing material

Claims

1. an underfloor frame body arranged on the lower floor wall panel and assembled with floor joists; A floor plywood laid on the upper surface of the underfloor frame; an upper floor wall panel disposed on the floor plywood above the lower floor wall panel; A three-dimensional network structure laid on the upper surface of the floor plywood; A floor underlayment material laid on the three-dimensional network structure; Equipped with The upper floor wall panel has a sill, The lower frame has a groove-shaped air passage on a bottom surface of the lower frame, the air passage extending in a width direction of the lower frame and communicating with the three-dimensional network structure. Interstory structure.

2. The floor structure according to claim 1, wherein the ventilation passage is a groove formed in the bottom surface of the lower frame.

3. The floor structure according to claim 1 , wherein the ventilation passage is the spacing between a plurality of protrusions fixed at intervals to the bottom surface of the lower frame.

4. The floor structure according to claim 3, wherein the protrusion is an asphalt-based vibration-damping material fixed to the bottom surface of the lower frame via double-sided tape.

5. The floor structure of claim 1, wherein the three-dimensional mesh structure comprises a mat-like body formed by fused and entangled polymer filaments and a moisture-permeable waterproof sheet attached to the outer surface of the mat-like body.

6. The joist material includes an end joist, a side joist, and a floor joist, The floor structure according to claim 1, wherein the height dimension of the floor joists is shorter than the height dimensions of the end joists and the side joists.

7. Ceiling boards and a ceiling joist to which the ceiling board is fixed; An elastic holding member that holds the ceiling joist; A support member is further provided which is fixed to the joist material intersecting the ceiling joist and supports the elastic retaining member, The elastic retaining member has rubber elasticity and has a bottom edge that abuts against the bottom surface of the ceiling joist, a pair of side edges that extend from both ends of the bottom edge and abut against both side surfaces of the ceiling joist, and a pair of upper edges that extend inward from the pair of side edges and abut against both sides of the upper surface of the ceiling joist, The ceiling board is fixed to the ceiling joist via the bottom edge of the elastic holding member. The floor structure according to claim 1.

8. The support member is formed of a metal plate and includes a fixing portion fixed to the joist material intersecting the ceiling joist, and a receiving portion connected to the fixing portion and receiving the ceiling joist; The receiving portion includes a pair of legs extending from the lower end of the fixing portion, a pair of support pieces extending horizontally and parallel from the pair of legs and on which the elastic retaining member is placed, and a locking portion erected on the support pieces and capable of contacting the elastic retaining member, and is configured so that the ceiling joist can be inserted between the pair of legs, The bottom side of the elastic holding member has a protrusion that protrudes downward from between the pair of support pieces and abuts against the ceiling board. The floor structure according to claim 7.

9. The support member is formed of a wooden board, and a notched recess for holding the elastic holding member is formed at a lower end of the support member, the notched recesses are formed to abut against outer surfaces of the pair of side edges of the elastic holding member and to support a lower portion of the elastic holding member from both sides, The bottom side of the elastic holding member has a protrusion that protrudes downward from the notched recess and abuts against the ceiling plate. The floor structure according to claim 7.

10. The notched recess has an arc shape with a central angle of 270° or more, The floor structure according to claim 9, wherein the outer surfaces of a pair of sides of the elastic retaining member are formed to abut along the arc-shaped inner peripheral surface of the notched recess.

11. The floor structure according to claim 7, wherein the support member is fixed via a buffer material.

12. 2. The floor structure according to claim 1, wherein a packing material is interposed between the floor plywood and the underfloor frame.

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