JP2023175573A - Dry double-floor structure, floor panel, and supporting leg - Google Patents

Abstract

To provide a dry double floor structure, a floor panel, and a supporting leg capable of improving sound insulation performance.SOLUTION: On the back centers of conifer structural plywood 8, 15, a reinforcement band plate 10, 17 extending in a direction roughly orthogonal to a fiber direction Z in which a grain extends and a connection band plate 14, 19 extending along the back side edge of the conifer structural plywood are provided. The back side edge of the other of adjacent pieces of conifer structural plywood is mounted on the connection band plate of one of the adjacent pieces of conifer structural plywood and connected. Damping materials 9, 13, 16, and 18 are held between the conifer structural plywood and the reinforcement band plate and between the conifer structural plywood and the connection band plate. In the conifer structural plywood 8 supported and fixed along a wall 2 of a structural skeleton among the laid pieces of conifer structural plywood, a damping material fixing band plate 12 is fixed holding a damping material 11 for extension roughly in parallel to the fiber direction Z in which the gain extends in an extra space of the reinforcement band plate and the connection band plate. A supporting leg 4, 5 is provided with a damping material in the top surface, and supports the conifer structural plywood via the damping material of the top surface.SELECTED DRAWING: Figure 1

Description

The present invention relates to a dry double floor structure, and in particular to a dry double floor structure with improved sound insulation performance, a floor panel used in the dry double floor structure, and support legs used in the dry double floor structure. Regarding.

Conventionally, support legs are fixed to the floor slab of a reinforced concrete construction (RC construction), steel reinforced concrete construction (SRC construction), or steel construction (S construction), and the structural plywood serving as the base of the floor is supported by the support legs. In addition, a reinforcing strip material and a connecting strip material are provided on the back side of the structural plywood to increase the rigidity of the floor structure, thereby suppressing the so-called drumming phenomenon and improving high sound insulation performance against heavy floor impact noise. A double-bed structure is known (Patent Document 1).

JP 2020-190078 Publication

However, with the above-mentioned conventional dry double floor structure, there are cases where the desired sound insulation performance is obtained and cases where the sound insulation performance is degraded, resulting in variations in the sound insulation performance.

Therefore, the main object of the present invention is to provide a dry double floor structure capable of reducing variations in sound insulation performance, a floor panel used therein, and support legs.

Another object of the present invention is to provide a dry double floor structure that can be constructed at low cost.

In order to solve the above problems, as a result of intensive research by the present inventors, it was found that the desired sound insulation performance was obtained for structural plywood that is supported at a distance from the walls or beams of the structural frame. It has been found that structural plywood that is supported along walls or beams has a reduced sound insulation performance.

It was considered that the sound insulation performance could be improved by adding reinforcing strips bonded to the structural plywood to further increase the rigidity, but the structure was placed in areas where the strength of the structural frame was required (exterior walls, beams). It has been found that when plywood is increased in rigidity by adding reinforcing strips, its sound insulation performance decreases. For this reason, there were limits to the ability to suppress the drumming phenomenon by increasing the rigidity of structural plywood.

Therefore, in order to achieve the above object, a dry double floor structure according to one aspect of the present invention includes coniferous structural plywood that is supported and fixed to support legs fixed on a floor slab of a reinforced concrete building and laid in rows. Each of the softwood structural plywood has a dry double bed structure, and each of the softwood structural plywood has a reinforcing band plate extending in a direction substantially perpendicular to the fiber direction in which the wood grain extends in the center of the back surface, and a reinforcing band plate extending in a direction substantially perpendicular to the fiber direction in which the wood grain extends, and a side of the back surface of the softwood structural plywood. a connecting band plate extending along an edge, and a back side edge of the other adjacent coniferous structural plywood is placed on the connecting band plate of one of the adjacent coniferous structural plywoods. damping material is sandwiched between the softwood structural plywood and the reinforcing band plate, and between the softwood structural plywood and the connection band plate, and is laid out. Of the softwood structural plywood that is supported and fixed along the wall of the structural frame, the softwood structural plywood has a fiber direction in which the wood grain extends in the remaining space between the reinforcing band plate and the connection band plate. A damping material fixing band plate is fixed approximately in parallel with an additional damping material sandwiched therebetween, and the support legs are provided with a damping material on the top surface, and the support leg is provided with a damping material on the top surface, and the support leg is attached to the coniferous tree through the damping material on the top surface. Support structural plywood.

Among the softwood structural plywood, the softwood structural plywood supported by the support legs fixed on the beams of the structural frame has the reinforcement in the remaining space between the reinforcing strip and the connecting strip. The vibration damping material fixing band plate may be further provided with a damping material fixing band plate oriented substantially perpendicularly to the vibration damping material fixing band plate and fixed with the additional damping material sandwiched therebetween.

Further, a gypsum board is laid on the softwood structural plywood, a flooring material is laid on the plasterboard, and the softwood structural plywood supported along the wall is supported by the support legs without intervening the border joists. At the same time, a predetermined gap may be provided between the softwood structural plywood, the gypsum board, and the flooring material supported along the wall and the wall of the structural frame.

Furthermore, a buffer packing attached to the support leg may be interposed between the support leg that supports the coniferous structural plywood arranged near the wall and the wall surface.

In one embodiment, a metal plate of the reinforcing band plate is interposed between the reinforcing band plate and the vibration damping material, and the metal plate has a groove shape, and the reinforcing band plate and the vibration damping material are interposed. a web portion extending along the length direction and sandwiched between the vibration damping material; a flange portion bent on both sides of the web portion and extending along both side surfaces of the reinforcing band plate; a long hole extending along the length of the strip and formed in the web part, and a nail connecting the damping material and the reinforcing strip to the coniferous structural plywood is in the long hole. It is inserted.

In one embodiment, a metal plate of the connection band plate is interposed between the connection band plate and the vibration damping material, and the metal plate is groove-shaped, and the connection band plate and the vibration damping material are interposed. a web portion extending along the length direction and sandwiched between the damping material; a flange portion bent on both sides of the web portion and extending along both side surfaces of the connecting band plate; a long hole extending along the length of the strip and formed in the web portion, and a nail connecting the damping material and the connecting strip to the coniferous structural plywood is in the long hole. It is inserted.

In one embodiment, a metal plate of the reinforcing band plate is interposed between the reinforcing band plate and the vibration damping material, and the metal plate has a groove shape, and the reinforcing band plate and the vibration damping material are interposed. The reinforcing band plate includes a web portion extending along the length direction and sandwiched between the vibration damping material and a flange portion bent on both sides of the web portion. A slit groove is formed into which the groove is movably fitted.

In one embodiment, a metal plate of the connection band plate is interposed between the connection band plate and the vibration damping material, and the metal plate is groove-shaped, and the connection band plate and the vibration damping material are interposed. The connecting band plate includes a web portion that extends in the longitudinal direction and is sandwiched between the vibration damping material and a flange portion that is bent on both sides of the web portion. A slit groove is formed into which the groove is movably fitted.

Further, a floor panel according to one aspect of the present invention is a floor panel used as a subfloor for a dry double floor, and includes softwood structural plywood and a fiber direction in which the wood grain extends in the center of the back surface of the softwood structural plywood. and a reinforcing band plate extending and fixed in a direction substantially perpendicular to the plywood, and a reinforcing band plate extending along the back side edge of the coniferous structural plywood, protruding from the back side edge, fixed, and arranged adjacent to each other. A vibration damping device sandwiched between a connecting band plate for connecting other floor panels, and the coniferous structural plywood provided on one side of each of the reinforcing band plate and the connecting band plate. material and.

The floor panel includes, on the back side of the coniferous structural plywood, a damping material sandwiched in the remaining space of the reinforcing strip and the connecting strip in a direction substantially perpendicular to the reinforcing strip. The vibration damping material fixing band plate may be further provided.

A buffer packing may be attached to the side surface of the top plate so that the support leg comes into contact with a wall of the structural frame.

In the floor panel, a metal plate of the reinforcing band plate is interposed between the reinforcing band plate and the vibration damping material, and the metal plate has a groove shape, and a web portion extending along the length direction and sandwiched between the vibration damping material; a flange portion bent on both sides of the web portion and extending along both side surfaces of the reinforcing band plate; a long hole extending along the length of the strip and formed in the web part, and a nail connecting the damping material and the reinforcing strip to the coniferous structural plywood is in the long hole. can be inserted.

In the floor panel, a metal plate of the connecting band plate is interposed between the connecting band plate and the vibration damping material, and the metal plate has a groove shape, and the metal plate is in a groove shape, and the connecting band plate and the a web portion extending along the length direction and sandwiched between the damping material; a flange portion bent on both sides of the web portion and extending along both side surfaces of the connecting band plate; a long hole extending along the length of the strip and formed in the web portion, and a nail connecting the damping material and the connecting strip to the coniferous structural plywood is in the long hole. can be inserted.

In the floor panel, a metal plate of the reinforcing band plate is interposed between the reinforcing band plate and the vibration damping material, and the metal plate has a groove shape, and The reinforcing band plate includes a web portion extending longitudinally and sandwiched between the vibration damping material and a flange portion bent on both sides of the web portion. A recess may be formed into which the recess is slidably fitted in the transverse direction.

In the floor panel, a metal plate of the connecting band plate is interposed between the connecting band plate and the vibration damping material, and the metal plate has a groove shape, and the metal plate is in a groove shape, and the connecting band plate and the The connecting band plate includes a web portion that extends in the longitudinal direction and is sandwiched between the vibration damping material and a flange portion that is bent on both sides of the web portion. A recess may be formed into which the recess is slidably fitted in the transverse direction.

Further, the support leg according to one aspect of the present invention includes a base plate for fixing to a floor slab, a male screw portion provided upright on the base plate, and a receiving plate provided on the male screw portion such that the height thereof can be adjusted. and a damping rubber sheet attached to the receiving plate, a top plate attached to the damping rubber sheet, and a vibration damping material attached to the top plate.

According to the present invention, the damping material is sandwiched between the reinforcing strip and the connecting strip in the direction substantially perpendicular to the fiber direction on the back side of the softwood structural plywood, and the damping material is sandwiched between the supporting legs as well. On the back side of the coniferous structural plywood that is supported at the walls and beams, additional damping material is sandwiched between strips for fixing damping material parallel to the fiber direction, thereby achieving the desired sound insulation across the entire floor. Get performance.

Coniferous structural plywood used for flooring has a property that a deflection curve perpendicular to the fiber direction in which the wood grain extends has a larger curvature than a deflection curve parallel to the fiber direction in which the wood grain extends. For example, when a concentrated load is applied to the center (center of gravity) of softwood structural plywood, the cross section passing through the center will deflect more in the cross section perpendicular to the fiber direction than in the cross section parallel to the fiber direction. . Therefore, by providing the reinforcing strip in a direction substantially perpendicular to the fiber direction in which the wood grain extends, desired rigidity can be ensured and the amount of deflection can be effectively suppressed. Moreover, by suppressing deflection with reinforcing strips, the coniferous structural plywood can be made thinner, and costs can be reduced.

Furthermore, by adding damping material only to the coniferous structural plywood that is supported at the walls and beams of the structural frame, it is possible to improve the sound insulation performance while suppressing the material cost of the damping material.

When a person jumps on the floor or an object falls onto the floor, the softwood structural plywood bends and vibrates when the impact is applied to the floor surface, causing air vibration sound and the so-called drumming phenomenon. Structural plywood is supported by support legs without intervening joists when extending along the wall, and has a gap between it and the structural wall along with the plasterboard and flooring material laid on top of it, allowing it to be used in softwood structures. Air vibrations propagating along the back surface of the plywood can pass through the gap between the plywood and the structural wall without being obstructed by the floor joists, and the drumming phenomenon can be effectively suppressed.

FIG. 1 is a perspective view showing a first embodiment of a dry double bed structure according to the present invention. FIG. 2 is a perspective view of the floor panel used in the dry double floor structure of FIG. 1, viewed from the back side. FIG. 3 is a perspective view of the floor panel of FIG. 2 viewed from the front side. FIG. 2 is a perspective view of the floor panel used in the dry double floor structure of FIG. 1, viewed from the back side. FIG. 5 is a perspective view of the floor panel of FIG. 4 viewed from the front side. FIG. 2 is a perspective view showing support legs used in the dry double bed structure of FIG. 1; FIG. 2 is a perspective view showing support legs used in the dry double bed structure of FIG. 1; FIG. 2 is a plan view of the dry double bed structure of FIG. 1; FIG. 2 is an enlarged cross-sectional view of the main parts of the dry double floor structure shown in FIG. 1 after installing gypsum board and flooring material. FIG. 2 is a horizontal cross-sectional view showing the framework of a steel-framed or reinforced-reinforced building. FIG. 2 is an exploded perspective view of a floor panel used in a second embodiment of the dry double floor structure according to the present invention. FIG. 13 is a perspective view of the floor panel of FIG. 12 after assembly; FIG. 3 is an exploded perspective view of another floor panel used in the second embodiment of the dry double floor structure according to the present invention. FIG. 14 is a perspective view of the floor panel of FIG. 13 after assembly; FIG. 3 is a perspective view showing a metal plate used in a second embodiment of the dry double bed structure according to the present invention. FIG. 3 is a partially enlarged sectional view of a floor panel used in a second embodiment of the dry double floor structure according to the present invention. FIG. 2 is an enlarged plan view showing a partially cutaway floor panel used in a second embodiment of the dry double floor structure according to the present invention. It is a partially enlarged side view which shows the normal state (a) of the floor panel used for 2nd Embodiment of the dry double floor structure based on this invention, and the state when it bends (b). It is a top view which shows the construction state of 2nd Embodiment of the dry double bed structure based on this invention. 16 is a perspective view showing a modification of the metal plate of FIG. 15. FIG. FIG. 21 is a perspective view showing a state in which the metal plate of FIG. 20 is fitted into a connecting band plate or a reinforcing band plate. FIG. 22 is a partially enlarged sectional view of the floor panel including the metal plate of FIG. 21;

Embodiments of the dry double bed structure according to the present invention will be described below with reference to FIGS. 1 to 22. Note that the same or similar components are denoted by the same reference numerals throughout all the figures and all embodiments.

Referring to FIG. 1, a dry double floor structure 1 according to a first embodiment of the present invention has support legs fixed at predetermined intervals on a floor slab 3 along a wall 2 of a structural frame of a reinforced concrete building. 4, a support leg 5 fixed on the floor slab 3 at a predetermined intermediate position away from the wall 2, a floor panel 6 whose four corners are supported by the support legs 4 and 5, and a support leg 6 whose four corners are supported by the support legs 4 and 5; A floor panel 7 supported by 5 is provided.

Referring to FIGS. 2 and 3, the floor panel 6 includes a quadrilateral coniferous structural plywood 8 and a damping material 9 placed approximately at the center of the back side of the coniferous structural plywood 8. A reinforcing band plate 10 is fixed substantially parallel to the side portion, and a damping material is fixed to the back side of the coniferous structural plywood 8 through a damping material 11 in a direction substantially perpendicular to the reinforcing band plate 10. It is fixed via a damping material 13 to the back side of the two orthogonal side edges of the structural strip 12 and the softwood structural plywood 8, and the side edge of another floor panel 6 or another floor panel 7 arranged adjacently. and a connecting band plate 14 on which the parts are placed and fixedly connected via a damping material 13. Note that the connecting strip 14 may be provided on only one side edge of the floor panel 6 disposed near the wall on the side not shown.

The reinforcing band plate 10 is for reinforcing the softwood structural plywood 8 against bending, and is fixed so as to extend across both ends of the softwood structural plywood 8. The reinforcing strip 10 can be reinforced against bending by being fixed in a direction substantially perpendicular to the fiber direction Z (FIG. 2) in which the grains of the softwood structural plywood 8 extend. As described above, the softwood structural plywood 8 has a property that the deflection curve perpendicular to the fiber direction in which the wood grain extends (Z direction in FIG. 2) has a larger curvature than the deflection curve parallel to the fiber direction in which the wood grain extends. be. For example, when a concentrated load is applied to the center (center of gravity) of softwood structural plywood 8, the cross section passing through the center is more likely to deflect than the cross section perpendicular to the fiber direction than the cross section parallel to the fiber direction. growing. Therefore, by providing the reinforcing band plate 10 in a direction substantially orthogonal to the fiber direction Z in which the wood grain extends, the amount of deflection can be effectively suppressed. The fiber direction Z is the fiber direction in the surface layer portion of the softwood structural plywood 8.

The damping material fixing band plate 12 is installed in the remaining space of the reinforcing band plate 10 and the connecting band plate 14 in a direction substantially orthogonal to the reinforcing band plate 10, that is, in the fiber direction in which the grain of the softwood structural plywood 8 extends. Fixed along Z. Therefore, the length is less than half of the length of the reinforcing strip 10, and the purpose is not to increase the rigidity and reinforce the plywood 8 for softwood structures, but to simply add the damping material 11 to the softwood structure plywood 8. It is attached to the plywood 8 and used for the purpose of increasing the area of the damping material attached to the coniferous structural plywood 8. In the illustrated example, two damping material fixing strips 12 are fixed so as to sandwich the reinforcing strip 10, but it is also possible to use only one.

Referring to FIGS. 4 and 5, the floor panel 7 includes a quadrilateral coniferous structural plywood 15 and a damping material 16 placed approximately in the center of the back side of the coniferous structural plywood 15. A reinforcing band plate 17 is fixed substantially parallel to the side edge, and another floor is fixed to the back side of the two orthogonal side edges of the coniferous structural plywood 15 via a damping material 18, and is arranged adjacent to the reinforcing strip 17. A connecting band plate 19 is provided on which the side edge of the panel 6 or another floor panel 7 is placed and fixedly connected via a damping material 18. The reinforcing strip 17 is also effectively reinforced against bending by being fixed in a direction substantially perpendicular to the fiber direction Z in which the grains of the softwood structural plywood 15 extend.

In the illustrated example, the softwood structural plywood 8 and the softwood structural plywood 15 are both 908 mm long x 908 mm wide x 12 mm thick, and are made of soft wood plywood. In addition, in the illustrated example, each of the reinforcing strip plate 10, the reinforcing strip plate 17, the connecting strip plate 14, and the connecting strip plate 19 has a length of 816 mm x width of 90 mm x thickness of 30 mm (the thickness is 30 mm to 30 mm). 40 mm), and preferably LVL (laminated veneer lumber) is used, but it can also be formed from coniferous structural plywood.

As the damping materials 9, 11, 13, 16, and 18, materials known as damping materials used to improve the sound insulation properties of the floor panels 6 and 7 can be used. A damping material is generally attached to a sound source or the like to attenuate the vibrations of an object through which vibrations are propagated by the sound, thereby suppressing the vibrations themselves, thereby reducing so-called solid-borne sound. Therefore, the damping materials 9, 11, 13, 16, and 18 are made of a material with a higher density than the coniferous structural plywood 8, 15, the reinforcing strips 10, 17, and the connecting strips 14, 19. Damping materials in the construction field are mainly used by covering the entire surface of structural plywood as a flooring. For example, rubber-based damping materials, resin-based damping materials, asphalt-based damping materials, gypsum boards, etc. are known. ing. Known materials for rubber-based or resin-based damping materials include, for example, butyl rubber, rigid polyurethane foam, and vinyl acetate. As an asphalt-based damping material, for example, an asphalt sheet mixed with an inorganic material such as metal, which has high density and viscoelasticity, is known.

The damping materials 9, 11, 13, 16, and 18 must be attached in advance to the reinforcing strips 10, 17, the damping material fixing strip 12, and the connecting strips 14, 19, respectively. I can do it. By nailing the reinforcing strips 10, 17, the damping material fixing strips 12, and the connecting strips 14, 19 to the softwood structural plywood 8, 15, the damping materials 9, 11, 13 are fixed. , 16, and 18 are sandwiched together to form a sandwich structure.

Referring to FIG. 6, the support leg 4 fixed to the wall has a damping material 20 on the top surface and supports the coniferous structural plywood 8 via the damping material 20. The support leg 4 includes a base plate 21 for fixing to the floor slab 3, a male screw portion 22 provided upright on the base plate 21, a receiving plate 23 provided on the male screw portion 22 so that its height can be adjusted, and a receiving plate. a damping rubber sheet 24 attached to the damping rubber sheet 23; a top plate 25 attached to the damping rubber sheet 24; a damping material 20 attached to the top plate 25; and a damping material 20 attached to the side surface of the top plate 25. A packing 26 is provided. The structure of the support leg 4 in the illustrated example except for the damping material 20 has the same structure as the support leg known from Patent Document 1 (Japanese Unexamined Patent Publication No. 2020-190078).

Referring to FIG. 7, the support leg 5 fixed at a position away from the wall has a damping material 27 on its top surface and supports the coniferous structural plywood 15 via the damping material 27. The support leg 5 includes a base plate 28 for fixing to the floor slab 3, a male screw portion 29 provided upright on the base plate 28, a receiving plate 30 provided on the male screw portion 29 so that its height can be adjusted, and a receiving plate. 30, a top plate 32 attached to the damping rubber sheet 31, and a damping material 27 attached to the top plate 32.

The damping materials 20 and 27 can be made of the same material as the damping materials described above. The top plates 25 and 32 can be made of the same material as the reinforcing strips 10 and 17 and the connecting strips 14 and 19.

The dry double floor structure with the above configuration is constructed as follows. First, the support legs 4 and 5 are installed at predetermined positions on the floor slab 3, fixed to the floor slab 3 with adhesive, and the height is adjusted.

Next, floor panels 6 are placed at the corners of the floor. Again, the connecting strips 14, 14 fixed to the two orthogonal side edges of the floor panel 6 are arranged so as not to run along the wall. After arranging the floor panels 6 at the corners of the floor, adjacent floor panels 6 are sequentially arranged along the walls.

As shown in FIGS. 8 and 9, the floor panel 6 is fixed to the support leg 4 at a predetermined distance from the wall 2 of the structural frame with a gap X provided therebetween. The floor panel 6 and the support legs 4 can be connected by nailing or the like.

The side edges of the floor panels 6 to be subsequently installed adjacently are placed on the connecting strips 14 of the previously installed floor panels 6 and nailed. Adjacent floor panels 6, 6 are supported by one support leg 4.

After the installation of the floor panels 6 along the walls is completed, the floor panels 7 are supported by the support legs 5 and laid one after another. The support legs 5 simultaneously support the corners of four floor panels or the corners of two floor panels and two floor panels.

After the floor panels 6 and 7 are laid in this way, as shown in FIG. 9, for example, a gypsum board 33 is laid thereon, and a flooring material 34 is further laid thereon. A gap of approximately 2 mm is provided between the flooring material 34 and the baseboard 35, and a gap of approximately 5 mm is provided between the flooring material 34 and the wall surface.

The effects of the dry double bed structure having the above configuration will be explained below.

In a building made of reinforced concrete, so-called solid-borne sound is likely to be transmitted through the walls 2 of the structural body, which are parts where structural strength is required. The floor panel 6 near the wall has a vibration damping performance enhanced by adding a damping material 11 in addition to the damping material 9, so that its sound insulation performance is enhanced.

The floor panel 7 located away from the wall has the same panel rigidity as the floor panel 6, but it does not have the damping material 11 compared to the floor panel 6, so it has lower vibration damping performance than the floor panel 6. is low. However, the vibration damping material 16 fixed by the reinforcing strip 17 provides a certain vibration damping effect, and since it is surrounded by the floor panel 6, solid-borne sound generated on the floor panel 7 is transmitted to the wall 2. It can be attenuated by the floor panel 6 before propagating to the ground. Furthermore, since the floor panel 7 can be manufactured at a lower cost than the floor panel 6, an increase in the cost of the floor structure can be suppressed.

In addition, in the floor panels 6 and 7, the reinforcing strip 10 is fixed at approximately the center of the coniferous structural plywood 8 in a direction approximately perpendicular to the fiber direction in which the wood grain extends, so that the desired rigidity can be secured. The amount of deflection can be effectively suppressed. By suppressing the amount of deflection of the floor panels 6 and 7, the drumming phenomenon is also suppressed. In addition, by suppressing deflection with the reinforcing strip 10, the coniferous structural plywood 8 can be made thinner, and costs can be reduced.

In addition, the damping materials 9, 11, 13, 16, 18, 20, 27 include reinforcing strips 10, 17, damping material fixing strips 12, connecting strips 14, 19, support legs 4, support Since the structure is such that it is interposed between the legs 5 and the softwood structural plywood 8, the amount of damping material used can be reduced compared to the conventional structure in which damping material is provided over the entire floor panel, and the desired sound insulation can be achieved. performance can be obtained.

Furthermore, the floor panel 6 near the wall is arranged with a gap X of a predetermined width between it and the wall 2, and the gypsum board 33 and the flooring material 34 thereon are also arranged with a gap Y between them and the wall 2. Therefore, solid-borne sound is not transmitted from the floor panel 6 to the outer wall, and the space-borne sound under the floor caused by the deflection of the floor panels 6 and 7 can be propagated from the underfloor to the floor through the gaps X and Y, resulting in the so-called drum phenomenon. is suppressed.

In conventional floor structures, when the structural plywood along the wall extends along the wall surface, the joists are fixed to the support legs, so air-borne noise caused by walking on the floor, impact noise on the floor, etc. is transmitted along the underfloor. By being blocked by the edge joists, the drumming phenomenon is promoted, and the noise is transmitted downstairs as noise. However, in the present invention, there is no edge joist, so the sound of walking on the floor, impact noise, etc. on the floor is not transmitted to the edge joists. It can propagate under the floor unobstructed, propagate from floor to floor through the above-mentioned gap with the wall, and escape into the room above the floor through gap X as shown by arrow A in Figures 1 and 9. , it is possible to reduce the noise caused by the so-called drumming phenomenon that propagates downstairs.

Furthermore, the supporting legs 4 abut against the wall 2 via the buffer packing 26, thereby attenuating solid-borne sound from the floor panel 6 to the wall 2 through the supporting legs 4. Furthermore, since the supporting legs 4 support the coniferous structural plywood 8 of the floor panel 6 via the damping material 18, the vibration propagates from the coniferous structural plywood 8 to the wall 2 or floor slab 3 through the supporting legs 4. Solid-borne sound can also be attenuated. Similarly, the support leg 5 can also attenuate the propagation of solid-borne sound to the wall 2 or floor slab 3 by the damping material 20 .

According to the dry double floor structure according to the present invention, the sound insulation performance can be improved as described above, so even if the cover thickness of the floor slab 3 is made thinner than before, high sound insulation performance can be obtained.

Since the damping materials 9, 11, 13, 16, and 18 are incorporated in the floor panels 6 and 7 in advance, there is no need to install the damping materials at the construction site, improving workability.

In the case of reinforced concrete construction (RC construction), steel reinforced concrete construction (SRC construction), and steel frame construction (S construction), as shown in Figure 10, steel frames (S) and reinforcing bars (R) covered with concrete (C) ) is located along the wall 2 such as the outer wall and at the beam 36, and these are areas where the strength of the structural frame is required and the sound insulation performance is reduced, so the beams that form the frame are 36 or T-shaped beams of the structural frame formed on the floor slab 3, the floor panel 6 with the added damping material 11 is supported by support legs (not shown) installed on those beams. Preferably supported.

Next, a second embodiment of the present invention will be described with reference to FIGS. 11 to 19. In the floor panel 6, a metal plate 37 is sandwiched between the connecting strip 14 and the damping material 13 and between the reinforcing strip 10 and the damping material 9. Similarly, in the floor panel 7, a metal plate 37 is sandwiched between the connecting strip 19 and the damping material 18 and between the reinforcing strip 17 and the damping material 16.

The metal plate 37 can preferably be formed of a pressed steel plate having a thickness of 0.4 to 1.6 mm and pressed into a groove shape. In the illustrated example, the softwood structural plywood 8, 15 is 15 mm thick, the connecting strips 14, 19 and the reinforcing strips 10, 17 are LVL (single layer laminate) and 28 mm thick, and the metal plate 37 is a plate. The thickness is 0.8 mm.

As shown in FIGS. 15 and 16, the metal plate 37 includes a web portion 37a, flange portions 37b, 37b bent on both sides of the web portion 37a, and a long hole 37c formed in the web portion 37a. Be prepared. The web portion 37a is sandwiched between the connecting strips 14, 19 and the damping materials 13, 18, and between the reinforcing strips 10, 17 and the damping materials 9, 16, respectively. The flange portions 37b, 37b are arranged along the respective side surfaces of the connecting strips 14, 19 and the reinforcing strips 10, 17.

Nails 38 for nailing the reinforcing strips 10, 17 and the connecting strips 14, 19 to the coniferous structural plywood 8, 15 are inserted through the elongated holes 37c. Referring to FIG. 17, the width W of the elongated hole 37c is preferably two to three times the diameter of the nail 38. Further, the length L of the elongated hole 37c is set to such a length that the nail 38 and the elongated hole 37c do not buffer when the floor panels 6, 7 undergo bending deformation. By setting the dimensional relationship between the nail 38 and the elongated hole 37c as described above, it is possible to prevent the generation of scraping and collision noises due to buffering between the nail 38 and the elongated hole 37c.

Referring to FIG. 18, the floor panels 6, 7 bend when a load is applied, but by providing a flange portion 37b on the metal plate 37 and improving the bending elastic modulus of the floor panel 6.7, the shear deformation S is prevented. The bending vibrations of the floor panels 6, 7 can be attenuated early, the generation of sound pressure due to the bending vibrations of the floor panels 6, 7 can be reduced, and vibration noise can be suppressed. Further, by improving the areal density and strength of the floor panels 6 and 7, the sound insulation performance can be improved.

Since the softwood structural plywood 8, 15 of the floor panel is supported on both sides by horizontal members composed of girders or floor beams, the lengths of the reinforcing strips 10, 17 and the connecting strips 14, 19 are The amount of deflection at both end portions in the direction is smaller than that at the middle portion. Therefore, the metal plate 37 is made shorter than the lengths of the connecting strips 14, 19 and the reinforcing strips 10, 17, and is placed in the middle of the connecting strips 14, 19 and the reinforcing strips 10, 17. can do.

Further, by providing the metal plate 37, the connecting strips 14, 19 and the reinforcing strips 10, 17 can be made thinner, the weight of the floor panels 6, 7 can be reduced, and costs can be reduced.

By interposing the metal plate 37, the floor panels 6, 7 further suppress the deflection of the coniferous structural plywood 8, 15, and suppress the vibration of the floor panels 6, 7, thereby increasing the effect of suppressing vibration noise. I can do it.

Next, modifications of the metal plate will be described with reference to FIGS. 20 to 22. In the metal plate 37A according to the modified embodiment, the width of the web portion 37a is narrower than that of the embodiment shown in FIG. 15. Therefore, slit grooves 39, 39 into which the flanges 37b, 37b of the metal plate 37A fit are formed in parallel in the connecting strips 14, 19 and the reinforcing strips 10, 17. The web portion 37a is sandwiched between the connecting strips 14, 19 and the damping materials 13, 18, and between the reinforcing strips 10, 17 and the damping materials 9, 16.

By making the width of the web portion 37a smaller than the width of the connecting band plates 14, 19 and the reinforcing band plates 10, 17, the connecting band plates 14, 19 and the reinforcing band plates 10, 17 can be connected to the slit groove 39, Since a space for driving the nails 38 on both sides of the metal plate 37 along the lines 39 is secured, it is not necessary to provide a long hole 37c like the metal plate 37. The slit groove 37 is formed to be longer than the flange part 37b by, for example, about 2 to 5 cm, and the flange part 37b can slide in the length direction within the slit groove 37, so that the floor panels 6 and 7 can be bent. The flange portion 37b is designed not to interfere with the end portion of the slit groove 37 when deformed. The other configuration of the metal plate 37A is the same as that of the metal plate 37 described above.

The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

1 Dry double floor structure 2 Exterior wall 3 Floor slabs 4, 5 Support legs 6, 7 Floor panels 8, 15 Coniferous structural plywood 9, 11, 13, 16, 18, 20, 27 Damping material 10, 17 Reinforcement band Plate 12 Damping material fixing band plates 14, 19 Connection band plates 21, 28 Base plates 22, 29 Male screw portions 23, 30 Receiving plates 24, 31 Damping rubber sheets 25, 32 Top plate 26 Buffer packing 36 Beams 37, 37A Metal plate 39 slit groove

Claims (16)

A dry double floor structure having coniferous structural plywood laid out in rows and supported by support legs fixed on a floor slab,
Each of the softwood structural plywood includes a reinforcing band plate extending in a direction substantially perpendicular to the fiber direction in which the wood grain extends in the center of the back surface, and a connection extending along the side edge of the back surface of the softwood structural plywood. comprising a strip plate for
The back side edge of the other adjacent coniferous structural plywood is placed on the connecting band plate of one of the adjacent coniferous structural plywoods, and the coniferous structural plywood is connected.
A damping material is sandwiched between the coniferous structural plywood and the reinforcing band plate, and between the coniferous structural plywood and the connection band plate, and
Among the coniferous structural plywood laid out, the coniferous structural plywood supported and fixed along the wall of the structural frame has wood grain extending into the remaining space between the reinforcing strip and the connecting strip. A vibration damping material fixing strip is fixed approximately parallel to the fiber direction, with the additional damping material sandwiched in between.
The support leg is provided with a damping material on the top surface, and supports the coniferous structural plywood via the damping material on the top surface.
The dry double bed structure. Among the softwood structural plywood, the softwood structural plywood supported by the support legs fixed on the beams of the structural frame has the reinforcement in the remaining space between the reinforcing strip and the connecting strip. 2. The dry double floor structure according to claim 1, further comprising a vibration damping material fixing band plate which is oriented substantially perpendicularly to the vibration damping material fixing band plate and is fixed with an additional damping material sandwiched therebetween. A gypsum board is laid on the coniferous structural plywood, a flooring material is laid on the plasterboard, and the coniferous structural plywood supported along the wall is supported by the support leg without intervening a border joist. According to claim 1 or 2, a predetermined gap is provided between the coniferous structural plywood, the gypsum board, and the flooring material supported along the wall and the wall of the structural frame. dry double bed structure. The dry double floor structure according to claim 1, wherein a buffer packing attached to the support legs is interposed between the support legs that support the coniferous structural plywood arranged near the wall and the wall surface. . A metal plate of the reinforcing band plate is interposed between the reinforcing band plate and the vibration damping material,
The metal plate has a groove shape, and includes a web portion that extends in the longitudinal direction and is sandwiched between the reinforcing band plate and the damping material, and a web portion that is bent and formed on both sides of the web portion. A flange portion extending along both side surfaces of the reinforcing strip plate, and a long hole extending along the length direction of the reinforcing strip plate and formed in the web portion,
Nails that connect the vibration damping material and the reinforcing strip to the coniferous structural plywood are inserted into the long holes,
The dry double bed structure according to claim 1. A metal plate of the connecting band plate is interposed between the connecting band plate and the vibration damping material,
The metal plate has a groove shape, and includes a web portion that extends in the longitudinal direction and is sandwiched between the connecting band plate and the vibration damping material, and a web portion that is bent and formed on both sides of the web portion. comprising a flange portion extending along both side surfaces of the connecting band plate, and a long hole extending along the length direction of the connecting band plate and formed in the web portion;
Nails that connect the vibration damping material and the connecting strip to the coniferous structural plywood are inserted into the long holes,
The dry double bed structure according to claim 1. A metal plate of the reinforcing band plate is interposed between the reinforcing band plate and the vibration damping material,
The metal plate has a groove shape and includes a web portion that extends in the length direction and is sandwiched between the reinforcing band plate and the vibration damping material, and flanges that are bent and formed on both sides of the web portion. and,
The reinforcing band plate is formed with a slit groove into which the flange portion is slidably fitted.
The dry double bed structure according to claim 1. A metal plate of the connecting band plate is interposed between the connecting band plate and the vibration damping material,
The metal plate has a groove shape and includes a web portion that extends in the length direction and is sandwiched between the connecting strip plate and the vibration damping material, and flanges that are bent and formed on both sides of the web portion. and,
The connecting band plate is formed with a slit groove into which the flange portion is slidably fitted.
The dry double bed structure according to claim 1. A floor panel used as a subfloor for a dry double floor,
Coniferous structural plywood,
a reinforcing band plate extending and fixed in a direction substantially perpendicular to the direction of fibers in which the wood grain extends at the center of the back surface of the softwood structural plywood;
a connecting strip extending along the back side edge of the softwood structural plywood, protruding from the back side edge and being fixed, and connecting other floor panels arranged adjacently;
a damping material provided on one side of each of the reinforcing band plate and the connecting band plate and sandwiched between the softwood structural plywood;
The floor panel comprising: On the back side of the softwood structural plywood, in the remaining space of the reinforcing band plate and the connecting band plate, a damping material is fixed with a damping material sandwiched therebetween, in a direction substantially perpendicular to the reinforcing band plate. The floor panel according to claim 5, further comprising a strip for fixing the material. A metal plate of the reinforcing band plate is interposed between the reinforcing band plate and the vibration damping material,
The metal plate has a groove shape, and includes a web portion that extends in the longitudinal direction and is sandwiched between the reinforcing band plate and the damping material, and a web portion that is bent and formed on both sides of the web portion. A flange portion extending along both side surfaces of the reinforcing strip plate, and a long hole formed in the web portion along the length direction of the reinforcing strip plate,
Nails that connect the vibration damping material and the reinforcing strip to the coniferous structural plywood are inserted into the long holes,
A floor panel according to claim 9. A metal plate of the connecting band plate is interposed between the connecting band plate and the vibration damping material,
The metal plate has a groove shape, and includes a web portion that extends in the longitudinal direction and is sandwiched between the connecting band plate and the vibration damping material, and a web portion that is bent and formed on both sides of the web portion. A flange portion extending along both side surfaces of the connecting band plate, and a long hole formed in the web portion along the length direction of the connecting band plate,
Nails that connect the vibration damping material and the connecting strip to the coniferous structural plywood are inserted into the long holes,
A floor panel according to claim 9. A metal plate of the reinforcing band plate is interposed between the reinforcing band plate and the vibration damping material,
The metal plate has a groove shape and includes a web portion that extends in the length direction and is sandwiched between the reinforcing band plate and the vibration damping material, and flanges that are bent and formed on both sides of the web portion. and,
The reinforcing band plate is formed with a recess into which the flange portion is slidably fitted in the longitudinal direction.
A floor panel according to claim 9. A metal plate of the connecting band plate is interposed between the connecting band plate and the vibration damping material,
The metal plate has a groove shape and includes a web portion that extends in the length direction and is sandwiched between the connecting strip plate and the vibration damping material, and flanges that are bent and formed on both sides of the web portion. and,
The connecting band plate is formed with a recess into which the flange portion is slidably fitted in the length direction.
A floor panel according to claim 9. A base plate for fixing to a floor slab, a male screw portion provided upright on the base plate, a support plate provided on the male screw portion such that its height can be adjusted, and a damping rubber sheet attached to the support plate. A support leg comprising: a top plate attached to the damping rubber sheet; and a damping material attached to the top plate. 16. The support leg according to claim 15, wherein a buffer gasket is attached to a side surface of the top plate for abutting against a wall of a structural frame.

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