JP7496580B2 - Floor structure and floor panel used in said floor structure - Google Patents

Description

The present invention relates to a floor structure using a joist-less construction method and its floor panels.

Conventionally, a floor construction method for the second or higher floors is known in which joists are not used, but the plywood base is made thicker and fastened directly to the beams, i.e., the joistless method. As an improvement to floor construction using the joistless method, a floor structure that can omit small beams has been proposed (Patent Document 1).

JP 2012-62715 A

However, while the conventional floor structure described in Patent Document 1 is easy to install, it does not give sufficient consideration to sound insulation. There was also a demand for cost reduction.

The main objective of the present invention is to provide a floor structure using a joist-less construction method and a floor panel for use in the floor structure, which allows for the omission of small beams, has excellent sound insulation properties, and allows for cost reduction, and a floor panel for use therein.

In order to achieve the above-mentioned object, a floor structure according to one embodiment of the present invention is a floor structure having softwood structural plywood that is installed on a cross member consisting of a girder or a floor beam, laid out and fixed, and the laid out softwood structural plywood includes a connecting strip that is fixed along one side edge that is approximately parallel to the grain direction of the wood grain so as to form a protruding portion that protrudes from the side edge, and at least one reinforcing strip that is approximately parallel to the grain direction of the wood grain and fixed in parallel with the connecting strip at a distance, and the softwood structural plywood includes a connecting strip that is fixed along one side edge that is approximately parallel to the grain direction of the wood grain so as to form a protruding portion that protrudes from the side edge, and at least one reinforcing strip that is approximately parallel to the grain direction of the wood grain and fixed in parallel with the connecting strip at a distance from the connecting strip, and the softwood structural plywood includes a connecting strip that is fixed along one side edge that is approximately parallel to the grain direction of the wood grain so as to form a protruding portion that protrudes from the side edge, and the connecting strip is fixed in parallel with the connecting strip at a distance from the connecting strip, and the connecting strip is fixed in parallel with the connecting strip at a distance from the connecting strip. The wood structural plywood is installed and fixed to the cross member so that the grain direction is approximately perpendicular to the length direction of the floor beam, and the resting portion of the side edge of the adjacent softwood structural plywood is placed on the protruding portion of the connecting strip of one adjacent softwood structural plywood along the length direction of the floor beam, and the two are connected and fixed, and vibration-damping material is sandwiched between the softwood structural plywood and the cross member, between the softwood structural plywood and the connecting strip, and between the softwood structural plywood and the reinforcing strip.

A ventilation passage for ventilation can be provided between the cross member and the placement portion.

The vibration-damping material attached to the mounting portion has gaps, which can form the ventilation passages.

Sound absorbing material can be attached to the back side of the softwood structural plywood.

The cross member is a steel beam having bolt holes, and the softwood structural plywood can be fixed to the cross member by bolts passed through the bolt holes.

A nut is embedded in the softwood structural plywood, and the bolt can be screwed into the nut.

In one embodiment, the metal plate of the reinforcing strip is interposed between the reinforcing strip and the vibration-damping material, and the metal plate is groove-shaped and includes a web portion that extends along the length and is sandwiched between the reinforcing strip and the vibration-damping material, flange portions that are bent and formed on both sides of the web portion and extend along both sides of the reinforcing strip, and long holes that extend along the length of the reinforcing strip and are formed in the web portion, and nails that connect the vibration-damping material and the reinforcing strip to the softwood structural plywood are inserted into the long holes.

In one embodiment, the metal plate of the connecting strip is interposed between the connecting strip and the vibration-damping material, and the metal plate is grooved and includes a web portion that extends along the length and is sandwiched between the connecting strip and the vibration-damping material, flange portions that are bent and formed on both sides of the web portion and extend along both sides of the connecting strip, and long holes that extend along the length of the connecting strip and are formed in the web portion, and nails that connect the vibration-damping material and the connecting strip to the softwood structural plywood are inserted into the long holes.

In one embodiment, the metal plate of the reinforcing strip is interposed between the reinforcing strip and the vibration-damping material, and the metal plate is groove-shaped and includes a web portion that extends along the length direction and is sandwiched between the reinforcing strip and the vibration-damping material, and flange portions that are bent and formed on both sides of the web portion, and the reinforcing strip is formed with a slit groove into which the flange portions slidably fit.

In one embodiment, the metal plate of the connecting strip is interposed between the connecting strip and the vibration-damping material, and the metal plate is groove-shaped and includes a web portion that extends along the length and is sandwiched between the connecting strip and the vibration-damping material, and flange portions that are bent and formed on both sides of the web portion, and the connecting strip is formed with a slit groove into which the flange portions slidably fit.

In addition, the floor panel according to one embodiment of the present invention is a floor panel that is erected on a cross member consisting of a girder or floor beam, laid out and fixed, and comprises softwood structural plywood, a connecting strip that is nailed to the back side of the softwood structural plywood along one side edge that is approximately parallel to the grain direction of the wood grain to form a protruding portion that protrudes from the one side edge, and is used to nail and connect other adjacent floor panels, and a connecting strip that is nailed to the back side of the softwood structural plywood along the front side that is approximately parallel to the grain direction of the wood grain. The system includes at least one reinforcing strip nailed in parallel to the connecting strip at intervals, a vibration-damping material attached to one side of the connecting strip and sandwiched between the softwood structural plywood and the connecting strip, a vibration-damping material attached to a placement part placed on the cross member that extends in a direction approximately perpendicular to the fiber direction in which the grain of the softwood structural plywood extends on the back side of the softwood structural plywood, and a vibration-damping material attached to one side of the reinforcing strip and sandwiched between the softwood structural plywood and the reinforcing strip.

The floor panel may further have vibration-damping material attached to the other side edge of the back side of the softwood structural plywood, which is approximately parallel to the direction of the grain of the wood.

The floor panel may further have a ventilation passage for allowing ventilation between the placement portion and the cross member.

The floor panel can form the ventilation passage by providing a gap in the vibration-damping material attached to the placement portion.

The floor panel may further include sound absorbing material attached to the underside of the softwood structural plywood.

The floor panel may have eye nuts embedded in the aforementioned placement portion of the softwood structural plywood.

The floor panel has a metal plate of the reinforcing strip interposed between the reinforcing strip and the vibration-damping material, and the metal plate is grooved and has a web portion extending along the length direction and sandwiched between the reinforcing strip and the vibration-damping material, flange portions bent and formed on both sides of the web portion and extending along both sides of the reinforcing strip, and long holes extending along the length direction of the reinforcing strip and formed in the web portion, and nails that connect the vibration-damping material and the reinforcing strip to the softwood structural plywood can be inserted into the long holes.

The floor panel has a metal plate of the connecting strip interposed between the connecting strip and the vibration-damping material, and the metal plate is grooved and has a web portion extending along the length direction and sandwiched between the connecting strip and the vibration-damping material, flange portions bent and formed on both sides of the web portion and extending along both sides of the connecting strip, and long holes extending along the length direction of the connecting strip and formed in the web portion, and nails that connect the vibration-damping material and the connecting strip to the softwood structural plywood can be inserted into the long holes.

The floor panel has a metal plate of the reinforcing strip interposed between the reinforcing strip and the vibration-damping material, the metal plate being groove-shaped and including a web portion extending along the length direction and sandwiched between the reinforcing strip and the vibration-damping material, and flange portions formed by bending on both sides of the web portion, and the reinforcing strip may have a recess formed in which the flange portion can slide in the length direction.

The floor panel has a metal plate of the connecting strip interposed between the connecting strip and the vibration-damping material, the metal plate being groove-shaped and including a web portion extending along the length direction and sandwiched between the connecting strip and the vibration-damping material, and flange portions formed by bending on both sides of the web portion, and the connecting strip may have a recess formed in which the flange portion can slide in the length direction.

According to the present invention, high vibration-damping performance can be obtained and sound insulation can be improved by sandwiching vibration-damping material between the cross member consisting of the girder and floor beam and the aforementioned placement portion, between the softwood structural plywood and the connecting strip, and between the softwood structural plywood and the reinforcing strip. In addition, by limiting the locations where the vibration-damping material is provided, the amount of vibration-damping material used can be reduced compared to when the vibration-damping material is provided on the entire surface of the structural plywood, and sound insulation performance can be improved while suppressing the increase in the cost of the vibration-damping material.

The softwood structural plywood used for floor underlayment has the property that the bending curve perpendicular to the grain direction has a larger curvature than the bending curve parallel to the grain direction. By nailing a pair of support parts that are approximately perpendicular to the grain direction to the cross members, the bending of the softwood structural plywood can be effectively suppressed.

The bending of the cross section of softwood structural plywood parallel to the direction of the grain can be suppressed by the use of connecting strips and reinforcing strips. By appropriately setting the thickness and other dimensions of the reinforcing strips and the number of strips, it is possible to obtain the appropriate bending of the softwood structural plywood, i.e., bending that is comfortable and easy to walk on.

In addition, by providing connecting strips and reinforcing strips, the thickness of the softwood structural plywood can be reduced while still achieving the same flexure and strength as conventional plywood, which allows for cost reductions.

In addition, by providing a ventilation passage between the softwood structural plywood and the girder or floor beam, a path for airborne sound is created, reducing noise caused by the drumming phenomenon.

Furthermore, by attaching a sound-absorbing material to the backside of the softwood structural plywood, it is possible to absorb airborne sound and improve sound insulation performance.

For beams made of shaped steel such as lightweight steel or H-shaped steel, bolt holes can be provided in the beam and the softwood structural plywood can be secured to the beam by bolts passed through the bolt holes. In this case, embedding eye nuts in the softwood structural plywood makes it easier to secure the plywood.

1 is a perspective view of one embodiment of a floor panel according to the present invention, viewed from the front side. 2 is a perspective view of the floor panel of FIG. 1 as viewed from the back side. FIG. 2 is a perspective view showing a construction mode of a floor structure using the floor panel of FIG. 1. FIG. 3 is a perspective view showing a modification of the floor panel of FIG. 2 . FIG. 5 is a perspective view showing a modification of the floor panel of FIG. 4 . FIG. 3 is a perspective view showing a modification of the floor panel of FIG. 2 . FIG. 3 is a perspective view showing a modification of the floor panel of FIG. 2 . FIG. 1 is a plan view showing one embodiment of a floor structure according to the present invention. FIG. 3 is a perspective view showing a modification of the floor panel of FIG. 2 . FIG. 10 is a perspective view showing a construction mode of a floor structure using the floor panel of FIG. 9 . FIG. 10 is a perspective view showing a modification of the floor panel of FIG. 9 . FIG. 12 is a perspective view showing a construction mode of a floor structure using the floor panel of FIG. 11. FIG. 12 is an enlarged cross-sectional view showing a portion of the floor structure of FIG. 11. FIG. 10 is a perspective view showing a modification of the floor panel of FIG. 9 . FIG. 11 is an exploded perspective view of another embodiment of a floor panel according to the present invention, seen from the back side. FIG. 16 is a perspective view of the floor panel of FIG. 15 as viewed from the front side. FIG. 16 is an enlarged perspective view of the metal plate of the floor panel of FIG. 15 . FIG. 16 is a partially enlarged cross-sectional view of the floor panel of FIG. 15 . FIG. 16 is a partially enlarged cutaway view of the floor panel of FIG. 15 . 16A is a partially enlarged side view showing the floor panel of FIG. 15 in a normal state and in a deflected state (b). FIG. 16 is a plan view showing a construction state of a floor structure using the floor panel of FIG. 15. FIG. 16 is a plan view showing the construction state of a floor structure using a modified embodiment of the floor panel of FIG. 15. FIG. 18 is a perspective view showing a modification of the metal plate of FIG. 17. FIG. 24 is a perspective view showing a state in which the metal plate of FIG. 23 is fitted into a connecting strip or a reinforcing strip. FIG. 24 is a partial enlarged cross-sectional view of a floor panel having the metal plate of FIG. 23.

Embodiments of the floor panel and floor structure according to the present invention will be described below with reference to Figures 1 to 25. Note that the same reference numerals are used to denote the same or similar components throughout all figures and all embodiments.

Referring to Figures 1 to 3, the floor panel 1A according to the first embodiment of the present invention is a floor panel 1A that is erected, laid out, and fixed to a cross member (F, T) consisting of a girder T or a floor beam (large beam) F, and is made of softwood structural plywood 2, a connecting strip 3 that is nailed to the back side of the softwood structural plywood 2 so as to form a protruding portion 3a that protrudes from one side edge 2c that is approximately parallel to the fiber direction X in which the wood grain extends, and a connecting strip 3 that is approximately parallel to the fiber direction X in which the wood grain extends and is spaced from the connecting strip 3. The structure is provided with at least one reinforcing strip 4 nailed in parallel with a space between them, a vibration-damping material 5 provided on one side of the connecting strip 3 and sandwiched between the softwood structural plywood 2 and the connecting strip 3, a vibration-damping material 6 extending in a direction substantially perpendicular to the fiber direction X along which the grain of the softwood structural plywood 2 extends on the back surface of the plywood and attached to the support parts 2a and 2b that are placed on the cross members (F, T), and a vibration-damping material 7 provided on one side of the reinforcing strip 4 and sandwiched between the softwood structural plywood 2 and the reinforcing strip 4. The fiber direction X is the fiber direction in the surface layer of the softwood structural plywood 2.

The softwood structural plywood 2 shown in Figure 1 is a square with dimensions of 908 mm length x 908 mm width and 15 mm thickness. Softwood structural plywood can also be rectangular with dimensions of 908 mm length x 1816 mm width and a thickness of 15 mm. The softwood structural plywood 2 is fixed to the cross members (T, F) so that the fiber direction X in which the wood grain extends is approximately perpendicular to the length direction Y of the floor beam F as shown in Figure 3.

The connecting strip 3 is nailed to the softwood structural plywood 2 with the vibration-damping material 5 in between, but adhesive can also be used. The connecting strip 3 can be made of wood, preferably LVL (laminated veneer lumber), but can also be made of the same softwood plywood as the softwood structural plywood 2. The connecting strip 3 extends close to the vibration-damping materials 6, 6 on the mounting portions 2a, 2b on both sides, but a gap is formed so that it does not come into contact with the vibration-damping materials 6, 6 on both sides. The connecting strip 3 in the illustrated example is 800 mm long, 90 mm wide, and 40 mm thick.

In the illustrated example, the protruding portion 3a of the connecting strip 3 that protrudes from the softwood structural plywood 2 has a width dimension that is approximately half the width of the connecting strip 3. The supporting portion 2d of the side edge of the floor panel 1A that is adjacently arranged along the length direction Y of the parallel floor beam F is placed on the protruding portion 3a and nailed to connect and fix the adjacent floor panels 1A, 1A.

The damping materials 5, 6, and 7 can be made of materials known as damping materials used to improve the sound insulation of floor underlayment. Damping materials are generally attached to sound sources, etc., to attenuate the vibrations of objects through which vibrations caused by sound are transmitted, thereby suppressing the vibrations themselves and reducing so-called solid-borne sound. Conventionally, damping materials in the construction field are mainly used by spreading them over the entire surface of softwood structural plywood as floor underlayment, and examples of known damping materials include rubber-based damping materials, resin-based damping materials, asphalt-based damping materials, and gypsum boards. Examples of known materials for rubber-based or resin-based damping materials include butyl rubber, hard polyurethane foam, and vinyl acetate. Examples of known asphalt-based damping materials include asphalt sheets mixed with inorganic materials such as metals, which have high density and viscoelasticity. The damping materials 5, 6, and 7 can be made of materials having a thickness of, for example, 3 to 10 mm.

The vibration-damping material 5 is arranged so as to cover almost the entire surface of one side (top surface in Fig. 1) of the connecting strip 3. The connecting strip 3 is nailed to the softwood structural plywood 2, so that the vibration-damping material 5 is sandwiched and fixed between the connecting strip 3 and the softwood structural plywood 2. The vibration-damping material 5 can also be adhered to the connecting strip 3 with an adhesive. Adhesive can also be interposed between the vibration-damping material 5 and the softwood structural plywood 2.

By sandwiching the vibration-damping material 5 between the softwood structural plywood 2 and the connecting strips 3 to create an integrated sandwich structure, the vibration of the floor panel 1 is damped, and sound insulation is achieved by reducing solid-borne sound from the floor panel 1 to the cross members (F, T). This improves sound insulation performance for the floors below.

In addition, the vibration-damping materials 5, 6, and 7 are not attached to the entire surface of the softwood structural plywood 2, but are provided in a limited area, which reduces the cost of expensive vibration-damping materials. Furthermore, the vibration-damping materials 5, 6, and 7 are delivered to the construction site already sandwiched between the floor panel 1A, eliminating the need to lay the vibration-damping materials at the construction site.

The reinforcing strip 4 can be made of wood and can be of the same material and dimensions as the connecting strip 3, but can also be made of other materials and dimensions. The reinforcing strip 4 extends close to the vibration-damping materials 6, 6 on the mounting parts 2a, 2b on both sides, but a gap is formed so that the reinforcing strip 4 does not come into contact with the vibration-damping materials 6, 6 on the mounting parts 2a, 2b on both sides. By nailing the reinforcing strip 4 to the softwood structural plywood 2, the vibration-damping material 6 is sandwiched and fixed between the softwood structural plywood 2 and the reinforcing strip 4, forming a sandwich structure, which attenuates the vibration of the floor panel 1 and enhances the sound insulation effect. As shown in Figures 4 and 5, the floor panels 1B and 1C can be provided with multiple reinforcing strips 4 arranged in parallel with intervals.

The vibration-damping material 6 is fixed by nails, tackers, adhesives, etc. to the placement portions 2a, 2b on the back side of the softwood structural plywood 2. With reference to Figures 6 and 8, the floor panel 1D placed on the girth _T1 perpendicular to the floor beam F has a placement portion 2d on the back side of the softwood structural plywood 2 at the side edge approximately parallel to the fiber direction X in which the grain extends, which also serves as a placement portion for the girth _T1 , so that the vibration-damping material 6d is also fixed to the placement portion 2d.

Referring to Figures 7 and 8, when the softwood structural plywood 2 is 908 mm long and 1818 mm wide, the placement parts 2a and 2b and the placement part 2e in the middle between them are placed on the cross members (floor beams T and F), so that the floor panel 1E has the vibration-damping material 6 fixed to each placement part 2a, 2b, and 2e. The width of the vibration-damping material 6 attached to the placement part 2e is approximately twice the width of the vibration-damping material 6 attached to the placement parts 2a and 2b, and is the same as the width of the floor beam F. In Figure 8, P1 is a pillar, P2 is a partition, and notches are formed in the floor panels 1D and 1E at the positions of the pillar P1 and partition P2.

By nailing the mounting portions 2a, 2b, and 2e of the softwood structural plywood 2 to the girths T or floor beams F, the vibration-damping material 6 is fixed in a sandwich shape between the softwood structural plywood 2 and the girths T or floor beams F. Therefore, the vibration-damping material 6 can be simply temporarily fixed to the softwood structural plywood 2 using a tacker or the like.

The placement parts 2a, 2b, and 2d of the softwood structural plywood 2 are nailed to the cross members (T, F) at a specified pitch and fixed. The connecting strips 3 are also nailed to the softwood structural plywood 2 at a specified pitch to connect and fix adjacent floor panels. In this embodiment, in the case of wooden beams, the necessary horizontal structure is ensured by, for example, nailing 3.8 mm in diameter at a 130 mm pitch. The length of the connecting strips 3 is set to a length that fits between the parallel floor beams F, and a gap is provided so as not to interfere with the floor beams F. The connecting strips 3 and reinforcing strips 4 also serve as small beams (intermediate beams), so small beams are omitted.

The mounting portions 2a, 2b, and 2d of the softwood structural plywood 2 are placed on the girths T or floor beams F and fixed with nails at a specified pitch, so that the vibration-damping material 6 is sandwiched between the girths or floor beams F and the softwood structural plywood 2, forming an integrated structure. As a result, the vibrations generated in the floor panels 1A to 1E are attenuated by the vibration-damping material 6 when they are transmitted to the girths T or floor beams F, and so-called solid-borne sound can be attenuated. As a result, the vibration sound of the second floor can be further reduced when it is transmitted to the floor below. The addition of the vibration-damping action of the vibration-damping materials 5, 6, and 7 improves sound insulation performance, mainly due to the attenuation of impact sound.

In addition, by providing the connecting strips 3 and at least one reinforcing strip 4, the amount of deflection of the floor panel 1A can be controlled. The softwood structural plywood 2 has a property that the deflection curve perpendicular to the grain direction X in which the grain extends has a larger curvature than the deflection curve parallel to the grain direction X in which the grain extends. For example, when a point load is applied to the center (center of gravity) of the softwood structural plywood, the cross section passing through the center tends to deflect more in a cross section perpendicular to the grain direction X than in a cross section parallel to the grain direction X. Therefore, by nailing a pair of support parts 2a, 2b that are approximately perpendicular to the grain direction X in which the grain extends to the cross members (F, T), the deflection of the softwood structural plywood 2 can be effectively suppressed.

The bending of the cross section of the softwood structural plywood 2 parallel to the fiber direction X along which the grain extends can be suppressed by the connecting strip 3 and at least one reinforcing strip 4. By appropriately setting the thickness and other dimensions of the reinforcing strip 4 and the number of strips, the amount of bending can be controlled to obtain an appropriate bending of the softwood structural plywood 2, i.e., a bending that is comfortable and easy to walk on.

In addition, by providing the connecting strip 3 and at least one reinforcing strip 4, the thickness of the softwood structural plywood 2 can be reduced, and the same amount of flexure and strength as conventional ones can be obtained, which allows for cost reduction. For example, by nailing the connecting strip 3 and reinforcing strip 4 to a 12 mm or 15 mm thick softwood structural plywood 2, the amount of flexure can be suppressed to the same amount as a 24 mm thick softwood structural plywood, allowing for cost reduction. Even if the softwood structural plywood 2 is made thinner, the necessary horizontal structural surface can be secured by appropriately setting the diameter and pitch of the nails nailed into the cross members (F, T).

By making the softwood structural plywood 2 thinner, the floor panels are made lighter. The floor panels of the present invention are used on the second and higher floors of a building, but by making them lighter, it is possible to make the floor panels on the first floor thinner. In general, when carrying out construction work, the floor framing for the first floor is constructed first, followed by the floor framing for the second floor. After the floor framing for the first floor is completed, the floor panels used for the floor framing for the second floor are temporarily placed on the floor of the first floor, so thick plywood is used for the floor of the first floor to withstand that load. By making the floor panels on the second floor lighter, the load-bearing capacity of the floor panels on the first floor can be reduced, so the floor panels on the first floor can be made thinner and lighter, and costs can be reduced. By making the floor panels on both the first and second floors lighter, transportation costs can also be reduced.

Next, referring to Figures 9 and 10, the floor panel 1F is provided with a ventilation passage 6a for ventilation between the softwood structural plywood 2 and the girder T or floor beam F.

The ventilation passage 7a allows ventilation between the mounting parts 2a, 2b of the softwood structural plywood 2 and the cross members (T, F) when the mounting parts 2a, 2b of the softwood structural plywood 2 are mounted and fixed on the cross members (T, F). In the illustrated example, the vibration-damping materials 6 are arranged with gaps between them like stepping stones, and these gaps become the ventilation passage 6a. Although not shown, if the vibration-damping material 6 is provided on the mounting part 2d, the ventilation passage 6a will also be provided on the mounting part 2d.

Also, referring to Figures 11 to 13, in the floor panel 1G applied to the steel beam F' (cross member) made of shaped steel such as lightweight steel or H-shaped steel for prefabricated buildings, a through hole 6c for passing a bolt B through can be provided in the vibration-damping material 6, and a stud nut N having the same axis as the through hole 6c can be embedded and fixed in the placement parts 2a, 2b of the softwood structural plywood 2. The steel beam F' has bolt holes H drilled at a predetermined pitch, and the bolt B passed through the bolt hole H of the steel beam F' is screwed through the through hole 6c of the vibration-damping material 6 into the stud nut N embedded and fixed in the softwood structural plywood 2, so that the softwood structural plywood 2 and the steel beam F' can be fixed together as a sandwich structure with the vibration-damping material 6 sandwiched between them. For example, the size of the bolt B can be M8 and the pitch of the bolt B can be 390 mm, thereby obtaining the required horizontal structural plane. Although not shown, if a vibration-damping material 6 is provided on the mounting portion 2d, a ventilation passage 6a is also provided on the mounting portion 2d.

The ventilation passage 6a can take various forms, for example, a through hole may be formed in the vibration-damping material 6, or a recessed groove may be formed in the vibration-damping material 6.

By providing the ventilation passage 6a, air vibrations generated on the backside of the floor panels 1F, 1G due to vibrations caused by impacts on the floor panel 1 can escape through the ventilation passage 6a without being blocked by the cross members (T, F), so that the air transmission of impact noise caused by the so-called drumming phenomenon can be attenuated. Note that instead of the onime nuts, normal nuts can be placed on the softwood structural plywood 2. Also, application to steel beams can be similarly applied to floor panels of other configurations, such as floor panels 1A, 1B.

Next, referring to FIG. 14, floor panel 1H has sound-absorbing material 8 attached to the back surface of softwood structural plywood 2. The rest of the configuration of floor panel 1E is the same as floor panel 1F in FIG. 9. Sound-absorbing material 8 is a material that is highly effective at absorbing airborne sound, and known sound-absorbing materials such as glass wool, felt, urethane foam, sponge, and cellulose fiber can be used. Sound-absorbing material 8 can be fixed to the back surface of softwood structural plywood 2 with an adhesive or the like.

The sound-absorbing material 8 is attached directly to the back surface of the softwood structural plywood 2, and is attached to the remaining space of the reinforcing strips 4, connecting strips 3, girths T, or floor beams F, if any, so as not to interfere with them.

By providing sound-absorbing material 8, floor panel 1H reduces airborne noise, further reducing the transmission of noise such as footstep sounds and impact sounds generated on upper floors to the floor below.

Next, referring to Figures 15 to 22, in the floor panel 1J, metal plates 9 are sandwiched between the connecting strips 3 and the vibration-damping material 5, and between the reinforcing strips 4 and the vibration-damping material 7. The metal plates 9 can be preferably made of pressed steel plates formed by pressing steel plates having a thickness of 0.4 to 1.6 mm into a groove shape. In the illustrated example, the softwood structural plywood 2 has a thickness of 15 mm, the connecting strips 3 and the reinforcing strips 4 are LVL (single layer laminate) with a thickness of 28 mm, and the metal plates 9 have a thickness of 0.8 mm.

As shown in Figures 17 to 19, the metal plate 9 has a web portion 9a, flange portions 9b, 9b formed by bending on both sides of the web portion 9a, and a long hole 9c formed in the web portion 9a. The web portion 9a is sandwiched between the connecting strip 3 and the vibration-damping material 5, and between the reinforcing strip 4 and the vibration-damping material 7. The flange portions 9b, 9b are arranged so as to fit along the respective side surfaces of the connecting strip 3 and the reinforcing strip 4.

The nails 10 for fastening the reinforcing strips 4 and the connecting strips 3 to the softwood structural plywood 2 are inserted into the long holes 9c. Referring to FIG. 19, the width dimension W of the long holes 9c is preferably two to three times the diameter of the nails 10. The length dimension L of the long holes 9c is set to a length that does not cause interference between the nails 10 and the long holes 9c when the floor panel 1J is bent and deformed. By setting the dimensional relationship between the nail fastening nails 10 and the long holes 9c as described above, it is possible to prevent the generation of rubbing noises and collision noises caused by interference between the nails 10 and the long holes 9c.

Referring to FIG. 20, the floor panel 1J bends when a load is applied, but by providing a flange portion 9b on the metal plate 9 and improving the bending elastic modulus of the floor panel, the bending vibration of the floor panel 1J caused by shear deformation S can be attenuated early, reducing the generation of sound pressure due to the bending vibration of the floor panel 1J and suppressing vibration noise. In addition, the sound insulation performance can be improved by improving the surface density and strength of the floor panel 1J.

The softwood structural plywood 2 of the floor panel is supported on both sides by cross members consisting of girder or floor beams, so the amount of deflection at both ends in the length direction of the reinforcing strip 4 and the connecting strip 3 is smaller than that at the middle part. Therefore, the metal plate 9 can be made shorter than the length of the connecting strip 3 and the reinforcing strip 4, and placed at the middle part of the connecting strip 3 and the reinforcing strip 4.

As shown in FIG. 22, two or more reinforcing strips 4 can be provided on one floor panel 1J, and a metal plate 9 is disposed on each reinforcing strip 4. When multiple reinforcing strips 4 are provided on one floor panel 1J, metal plates 9 can be provided on all reinforcing strips 4, or metal plates 9 can be provided on only some of the reinforcing strips 4. The amount of deflection of the floor panel 1J can be controlled by increasing or decreasing the number of reinforcing strips 4 and the number of metal plates 9.

In addition, by providing the metal plate 9, the connecting strip 3 and the reinforcing strip 4 can be made thinner, making the floor panel 1J lighter and less expensive.

By inserting a metal plate 9 between the floor panel 1J and the board, the deflection of the cross section parallel to the fiber direction X along which the grain of the softwood structural plywood 2 extends is further suppressed, and the vibration of the floor panel 1J is suppressed, thereby enhancing the effect of suppressing vibration noise.

Next, a modified version of the metal plate will be described with reference to Figures 23 to 25. As shown in Figure 23, the metal plate 9A according to the modified version has a narrower width of the web portion 9a than that of the embodiment shown in Figure 17. Therefore, the connecting strip 3 and the reinforcing strip 4 have parallel slit grooves 11, 11 into which the flange portions 9b, 9b of the metal plate 9A fit. The web portion 9a is sandwiched between the connecting strip 3 and the vibration-damping material 5, and between the reinforcing strip 4 and the vibration-damping material 7.

By making the width of the web portion 9a smaller than the width of the connecting strip 3 and the reinforcing strip 4, the connecting strip 3 and the reinforcing strip 4 have space along the slit grooves 11, 11 to drive nails 10 into both sides of the metal plate 9, so there is no need to provide long holes 9c like in the metal plate 9. The slit groove 11 is formed to be, for example, about 2 to 5 cm longer than the flange portion 9b, so that the flange portion 9b can slide in the slit groove 11 in its length direction, and the flange portion 9b does not interfere with the end of the slit groove 11 when the floor panel 1J is bent and deformed. The other configuration of the metal plate 9A is the same as that of the metal plate 9 described above.

The present invention should not be interpreted as being limited to the above-described embodiment, and various modifications are possible without departing from the spirit of the present invention.

1A, 1B, 1C, 1D, 1E, 1F, 1G, 1H, 1J Floor panel 2 Softwood structural plywood 3 Connecting strips 4, 6, 6a, 7 Vibration-damping material 5 Reinforcing strip 8 Sound-absorbing material 9, 9A Metal plate

Claims (20)

A floor structure having softwood structural plywood that is laid and fixed on a cross member composed of a girder or floor beam,
The laid out softwood structural plywood comprises a connecting strip fixed along one side edge substantially parallel to the grain direction of the wood grain so as to form a protruding portion protruding from the side edge, and at least one reinforcing strip fixed in parallel to the grain direction of the wood grain and spaced apart from the connecting strip,
The softwood structural plywood is installed and fixed to the cross member so that the grain direction of the wood is approximately perpendicular to the longitudinal direction of the floor beam,
The supporting portion of the side edge of one of the adjacent softwood structural plywoods is placed on the protruding portion of the connecting strip of the other adjacent softwood structural plywood along the length direction of the floor beam, and the connecting strip is fixed to the protruding portion of the connecting strip of the other adjacent softwood structural plywood,
The floor structure, wherein vibration-damping materials are sandwiched between the softwood structural plywood and the cross members, between the softwood structural plywood and the connecting strips, and between the softwood structural plywood and the reinforcing strips. The floor structure according to claim 1 , further comprising an air passage for ventilation between the cross member and the placement portion.
The floor structure according to claim 2, wherein the vibration-damping material attached to the mounting portion has a gap therein, thereby forming the ventilation passage. The floor structure of claim 1, in which a sound-absorbing material is attached to the back surface of the softwood structural plywood. The floor structure of claim 1, in which the cross members are shaped steel members having bolt holes, and the softwood structural plywood is fixed to the cross members by bolts passing through the bolt holes. The floor structure of claim 5, in which a countersunk nut is embedded in the softwood structural plywood, and the bolt is screwed into the countersunk nut. A metal plate of the reinforcing strip is interposed between the reinforcing strip and the vibration-damping material,
The metal plate is groove-shaped and includes a web portion that extends along the length direction and is sandwiched between the reinforcing strip and the vibration-damping material, flange portions that are bent and formed on both sides of the web portion and extend along both side surfaces of the reinforcing strip, and a long hole that extends along the length direction of the reinforcing strip and is formed in the web portion,
A nail for connecting the vibration-damping material and the reinforcing strip to the softwood structural plywood is inserted into the long hole.
The floor structure according to claim 1. A metal plate of the connecting strip is interposed between the connecting strip and the vibration-damping material,
The metal plate is groove-shaped and includes a web portion extending along the length direction and sandwiched between the connecting strip and the vibration-damping material, flange portions bent and formed on both sides of the web portion and extending along both side surfaces of the connecting strip, and a long hole formed in the web portion and extending along the length direction of the connecting strip,
A nail for connecting the vibration-damping material and the connecting strip to the softwood structural plywood is inserted into the long hole.
The floor structure according to claim 1. A metal plate of the reinforcing strip is interposed between the reinforcing strip and the vibration-damping material,
The metal plate is groove-shaped and includes a web portion extending along a length direction and sandwiched between the reinforcing strip plate and the vibration-damping material, and flange portions formed by bending on both sides of the web portion.
The reinforcing band plate is formed with a slit groove into which the flange portion is slidably fitted.
The floor structure according to claim 1. A metal plate of the connecting strip is interposed between the connecting strip and the vibration-damping material,
The metal plate has a groove shape and includes a web portion extending along a length direction and sandwiched between the connecting strip plate and the vibration-damping material, and flange portions formed by bending on both sides of the web portion.
The connecting strip plate is formed with a slit groove into which the flange portion is slidably fitted.
The floor structure according to claim 1. A floor panel that is installed and fixed to a cross member composed of a girder or floor beam,
Softwood structural plywood;
A connecting strip is nailed to the back side of the softwood structural plywood along one side edge that is approximately parallel to the grain direction of the wood grain, forming a protruding portion that protrudes from the one side edge, and is used to nail and connect another adjacent floor panel;
At least one reinforcing strip is nailed to the back surface of the softwood structural plywood in parallel with the connecting strip and spaced apart from each other, approximately parallel to the grain direction of the wood grain;
a vibration-damping material provided on one side of the connecting strip and sandwiched between the softwood structural plywood and the connecting strip;
A vibration-damping material extends in a direction substantially perpendicular to the direction in which the grain of the back surface of the softwood structural plywood extends, and is attached to a placement portion that is placed on the cross member;
a vibration-damping material provided on one side of the reinforcing strip and sandwiched between the softwood structural plywood and the reinforcing strip;
The floor panel. The floor panel according to claim 11, further comprising a vibration-damping material attached to the other side edge of the back side of the softwood structural plywood, which is approximately parallel to the direction of the grain of the wood. The floor panel according to claim 11, further comprising a ventilation passage for ventilation between the mounting portion and the cross member. The floor panel according to claim 13, wherein the vibration-damping material attached to the mounting portion has a gap therein, thereby forming the ventilation passage. The floor panel of claim 11, further comprising a sound absorbing material attached to the back surface of the softwood structural plywood. The floor panel according to claim 11, in which a countersunk nut is embedded in the aforementioned portion of the softwood structural plywood. A metal plate of the reinforcing strip is interposed between the reinforcing strip and the vibration-damping material,
The metal plate is groove-shaped and includes a web portion extending along the length direction and sandwiched between the reinforcing strip and the vibration-damping material, flange portions bent and formed on both sides of the web portion and extending along both side surfaces of the reinforcing strip, and a long hole formed in the web portion along the length direction of the reinforcing strip,
A nail for connecting the vibration-damping material and the reinforcing strip to the softwood structural plywood is inserted into the long hole.
12. A floor panel according to claim 11. A metal plate of the connecting strip is interposed between the connecting strip and the vibration-damping material,
The metal plate is groove-shaped and includes a web portion that extends along the length direction and is sandwiched between the connecting strip and the vibration-damping material, flange portions that are bent and formed on both sides of the web portion and extend along both side surfaces of the connecting strip, and a long hole that is formed in the web portion along the length direction of the connecting strip,
A nail for connecting the vibration-damping material and the connecting strip to the softwood structural plywood is inserted into the long hole.
12. A floor panel according to claim 11. A metal plate of the reinforcing strip is interposed between the reinforcing strip and the vibration-damping material,
The metal plate is groove-shaped and includes a web portion extending along a length direction and sandwiched between the reinforcing strip plate and the vibration-damping material, and flange portions formed by bending on both sides of the web portion.
The reinforcing band plate has a recess formed therein into which the flange portion is slidably fitted in the longitudinal direction.
12. A floor panel according to claim 11. A metal plate of the connecting strip is interposed between the connecting strip and the vibration-damping material,
The metal plate has a groove shape and includes a web portion extending along a length direction and sandwiched between the connecting strip plate and the vibration-damping material, and flange portions formed by bending on both sides of the web portion.
The connecting strip plate has a recess formed therein into which the flange portion is slidably fitted in the length direction.
12. A floor panel according to claim 11.

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