JP4825613B2 - High density fiberboard and floor structure - Google Patents

Description

The present invention relates to a floor structure using the high-density fiberboard 及 Bikakaru high-density fiberboard, in particular, high-density fiberboard 及 Bikakaru dense fibers in which slits are formed in a region including the striking portion of the fastening member The present invention relates to a floor structure using a board.

Conventionally, for example, a sound insulating floor structure 50 illustrated in FIG. 7 is known as a floor structure including a high-density fiberboard (see Patent Document 1).
FIG. 7 is a perspective view of a double floor according to Patent Document 1. FIG. FIG. 8 is a side sectional view showing a state in which the high-density fiberboard according to Patent Document 1 is laid between the floor base material and the floor finishing material.
The sound insulating floor structure 50 shown in FIG. 7 supports a plurality of floor base panels 54 at a predetermined height level by supporting leg groups 53 erected on a base surface 51 via elastic pedestals 52. The floor finishing material 55 is laid on the floor foundation. The sound insulating floor structure 50 includes a bending strength of 35 to 50 (N / mm 2), a bending Young's modulus of 4,000 to 5,000 (N / mm 2), between the floor base panel 54 and the floor finishing material 55. And the high-density fiber board 56 with a density of 0.8-1.2 (g / cm <3>) is laid.

And according to the sound insulation floor structure 50, the vibration of the floor foundation panel 54 can be suppressed by interposing the high density fiber board 56 between the floor foundation panel 54 and the floor finishing material 55, and the sound insulation performance can be improved. It becomes possible to improve.
JP 2004-238925 A

Here, in the sound-insulating floor structure 50 shown in FIG. 7, the high-density fiberboard 56 is fixed to the floor base panel 54 by a fastener B such as a nail as shown in FIG.
In general, when the fastening device B is placed on the fiberboard, the material is escaped by placing the fastening device B at the placement portion H of the fastening device B of the fiberboard. . And the escape of the material produced in the placement part H of a fiber board will be absorbed because the circumference | surroundings of the placement part H are compressed when the density of a fiber board is low.

However, since the high-density fiberboard 56 is formed at a high density and is difficult to be compressed, the escape of the material generated in the placement portion H when the fastening device B is placed is not absorbed around the placement portion H. As shown in FIG. 8, the high density fiber board 56 protrudes from the periphery of the placement portion H on each surface in the vertical direction, and a convex portion C is formed.
And if the convex part C is formed in each surface of the up-down direction of the high density fiber board 56, it will be between the high density fiber board 56 and the floor base panel 54, or between the high density fiber board 56 and the floor finishing material 55. There is a problem in that a gap A is generated and construction defects such as rattling occur.

The present invention has been made in order to solve the above-described problems of the prior art. The purpose of the present invention is to provide a projecting portion formed around the placement portion when the fastening device is placed on the high-density fiberboard. An object of the present invention is to provide a high-density fiberboard capable of avoiding outward projection from each surface in the vertical direction of the density fiberboard.
In addition, another object of the present invention is that protrusions formed around the placement portion when the fastening device is placed on the high-density fiber board project outward from each surface in the vertical direction of the high-density fiber board. An object of the present invention is to provide a floor structure capable of avoiding poor construction caused by the above.

The high-density fiberboard according to claim 1 of the present invention is a high-density fiberboard having a density of 0.8 (g / cm ³ ) or more that is fastened as a flooring by a fastening tool,
A slit is formed in each of the upper and lower surfaces of the high-density fiberboard in a region including a placement portion where the fastening tool is placed.
Moreover, the high-density fiber board which concerns on Claim 2 among this invention is a high-density fiber board of Claim 1, In the said high-density fiber board, two or more said placement parts are formed in a line form,
The slits are formed continuously in the extending direction of the placement portions formed in a row.
Moreover, the high density fiber board which concerns on Claim 3 among this invention is a high density fiber board of Claim 1 or 2, WHEREIN: The said slit is a width | variety of 2 times or more of the diameter of the said fastening device to be laid. It is characterized by being formed.

In is al, floor structure according to claim 4 of the present invention, there a underfloor member is laid on a foundation surface, the floor structure comprising a floor covering that is laid on the underfloor member And
The high-density fiberboard according to any one of claims 1 to 3 is laid between the floor base material and the floor finishing material.

  According to the high-density fiberboard according to any one of claims 1 to 3, the upper and lower surfaces of the high-density fiberboard are slit in a region including a placement portion where the fastening device is placed. Due to the configuration, the protrusions formed around the placement part when the fastening device is placed on the high-density fiberboard are prevented from protruding outward from the upper and lower surfaces of the high-density fiberboard. It becomes possible to do.

Furthermore, according to the floor structure which concerns on this-application Claim 4 , by the structure formed by laying the high-density fiber board of any one of Claims 1 thru | or 3 between a floor base material and the said floor finishing material. , To avoid construction defects caused by the protruding portions formed around the placement portion when the fastening device is placed on the high-density fiberboard project outward from the upper and lower surfaces of the high-density fiberboard. Is possible.

Hereinafter, a high-density fiberboard and a floor structure according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of a double floor according to an embodiment of the present invention. FIG. 2 is a side sectional view of the floor support unit. FIG. 3 is a perspective view of the high-density fiberboard according to the embodiment of the present invention. FIG. 4 is a side cross-sectional view showing a state in which a high-density fiberboard is laid between a floor base material and a floor finishing material.
The floor structure according to the present invention can be applied to various floor structures, and in this embodiment, the case where the floor structure according to the present invention is applied to a double floor 1 will be described as an example.

As shown in FIG. 1, the double floor 1 is installed in various buildings such as an apartment house, and a plurality of floor support units 3 installed on a floor surface of a foundation surface 2 such as a concrete slab, and a floor support unit 3. The floor base material 4 supported on the floor base material 4, the high-density fiber board 5 laid on the floor base material 4, and the floor finishing material 6 laid on the high-density fiber board 5.
As shown in FIG. 2, each floor support unit 3 includes a cushioning material 8 installed on the base surface 2, a support leg 9 standing on the cushioning material 8, and a support plate 10 supported by the support leg 9. And comprising.

  The cushioning material 8 is made of an elastic material such as a substantially cylindrical rubber, and a central hole 11 is formed in a substantially upper half of the central portion viewed from the vertical direction of the cushioning material 8. An annular groove-shaped recess 12 is formed on the inner peripheral surface of the side portion of the central hole portion 11. Further, a cross-shaped groove portion 14 is formed on the inner peripheral surface of the central hole portion 11 from the bottom surface 13 to the side surface of the central hole portion 11. Four substantially hemispherical protrusions 15 are symmetrically formed on the lower surface of the cushioning material 8. The cushioning material 8 has a ground contact area with the base surface 2 by forming the protrusions 15 and can obtain appropriate elasticity (sinking) while dispersing the received load. The impact sound can be reduced. Here, the height of each projection 15 is preferably about 2 to 4 mm, and all the projections 15 are preferably the same height. In addition, the buffer material 8 is fixed and installed on the base surface 2 by adhesion or the like at a predetermined interval.

The support leg 9 includes a hollow support bolt 18 erected on the cushioning material 8 so as to be rotatable, and a level adjusting nut 19 into which an upper end portion of the hollow support bolt 18 is screwed.
The hollow support bolt 18 is formed from a relatively short hollow pipe having a central casting hole. The hollow support bolt 18 is formed by buckling a ring-shaped protruding portion 20 that bulges laterally at the lower end portion, and a male screw portion 21 is formed on the outer peripheral surface of the upper end portion by a predetermined length from the upper end. In addition, a groove-like engagement portion 22 that engages the distal end of a rotary tool such as a screwdriver or an electric screwdriver is formed on the distal end surface of the hollow support bolt 18.

  The level adjusting nut 19 is formed of a relatively short hollow pipe having a central placement hole into which the hollow support bolt 18 can be screwed. A female screw portion 24 that fits the male screw portion 21 of the hollow support bolt 18 is formed on the inner peripheral surface of the lower end portion of the level adjusting nut 19 by a predetermined length from the lower end. In addition, an annular support portion 25 projects from a substantially central portion in the vertical direction of the outer peripheral surface of the level adjusting nut 19.

The support leg 9 is configured by screwing the upper end portion of the male screw portion 21 of the hollow support bolt 18 into the female screw portion 24 of the level adjusting nut 19.
The support plate 10 is formed by forming a particle board, a laminated plywood, a wood fiber board or the like into a substantially rectangular flat plate shape. The support plate 10 is provided with an insertion hole 27 into which the upper portion of the level adjusting nut 19 is fitted at a substantially central portion viewed from the vertical direction. Further, the upper end portion of the insertion hole 27 is formed with a chamfered portion 28 that is chamfered and expanded upward.

  The cushioning material 8 and the support leg 9 are combined by fitting the lower end portion of the hollow support bolt 18 of the support leg 9 into the central hole portion 11 of the cushioning material 8. In this case, the protrusion 20 of the hollow support bolt 18 is engaged with the recess 12 of the cushioning material 8 so that the support leg 9 is rotatably supported by the bottom surface 13 of the central hole 11 of the cushioning material 8. Established. Further, the support leg 9 and the support plate 10 are fitted into the insertion hole 27 of the support plate 10 with the upper end of the level adjustment nut 19 of the support leg 9, and the lower surface of the support plate 10 is supported by the level adjustment nut 19. They are combined by being supported by the portion 25. In this case, the upper end portion of the level adjustment nut 19 of the support leg 9 is expanded and partially buried in the chamfered portion 28 of the insertion hole 27 of the support plate 10, so that an adhesive is formed on the upper portion of the level adjustment nut 19. A reservoir 29 is formed.

Then, the floor support unit 3 configured as described above has a level by fitting the tip of a rotary tool such as a screwdriver into the engagement portion 22 formed on the top end surface of the hollow support bolt 18 and rotating it. The support plate 10 supported by the adjustment nut 19 moves up and down, and the floor surface level of the floor base material 4 supported by the support plate 10 can be adjusted.
As the floor base material 4, particle board, hard board, high density fiber board, plywood or the like is used. The floor base material 4 is fixed to the upper surface of the support plate 10 of the floor support unit 3 with an adhesive, a nail or the like, and is supported on the base surface 2 at a predetermined height level.

The high-density fiberboard 5 is made by adding some chemicals such as resin and paraffin and some adhesives (binder, phenol resin, etc.) to wood chips such as pulp and kenaf to increase strength and water resistance. Molded below, the density is formed to 0.8 (g / cm ³ ) or more. The high-density fiberboard 5 is laid on the floor base material 4 and fastened to the floor base material 4 by fastening tools B such as nails and screws.
Here, as shown in FIG. 3, concave slits S are formed on the upper and lower surfaces of the high-density fiberboard 5.

  As shown in FIG. 4, the slit S is formed in a region including a placement portion H where the fastening device B is placed when the high-density fiberboard 5 is laid on the floor base material 4. Here, in the present embodiment, a plurality of placement portions H are formed in a row on the high-density fiberboard 5, and the slits S are continuously formed in the extending direction of the plurality of placement portions H formed in a row. ing. Moreover, it is preferable that the slit S is formed in the width | variety more than twice the diameter of the fastening tool B to be laid. The slit S may have a configuration in which a concave portion having a circular shape or a square shape when viewed from above and below is provided separately for each placement portion H on each of the upper and lower surfaces of the high-density fiberboard 5. In order to facilitate the processing of the fiberboard 5, a plurality of groove-like slits S that are continuous in the longitudinal direction including the plurality of placement portions H are provided on the upper and lower surfaces of the high-density fiberboard 5 in the width direction. Is preferred. In this case, the dimension in the width direction of the groove-like slit S continuous in the longitudinal direction is preferably set to 10 mm or more in consideration of workability when the fastening tool B is driven.

Here, the high-density fiberboard 5 may be formed from wood chips (thinned wood, building waste wood, etc.) and plastic pellets (PP, PE, etc.). In this case, in the manufacturing method of the high-density fiberboard 5, first, wood chips and plastic pellets are mixed, and the mixture is heated and melted in a highly viscous state. And the high-density fiber board 5 is formed by shape | molding the fuse | melted mixture from a metal mold | die at high pressure to a plate-shaped object. Here, the shape of the mold used for extrusion formation is configured such that when extruding the molten mixture, groove-like slits continuous in the extrusion direction are formed on the upper and lower surfaces of the plate-like body to be molded. Has been. With this configuration, it is possible to easily form the high-density fiberboard 5 in which the groove-like slits S continuous in the extrusion direction are formed on the upper and lower surfaces. Here, the content rate of the wood chip and the plastic pellet in the high density fiber board 5 is set to 45 to 40% of the plastic pellet with respect to the wood chip of 55 to 60%, and the density of the high density fiber board 5 is 0.8. It is formed above (g / cm ³ ).

In addition, as a method of forming the slits S in the high-density fiberboard 5, even if the slits S are formed when the high-density fiberboard 5 is extruded by a mold, cutting is performed after the high-density fiberboard 5 is formed. The slit S may be formed by any method.
As the floor finish 6, flooring, a wood-based decorative board, a synthetic resin cushion sheet, a carpet, a carpet, a tatami mat, and the like can be used.

Next, an example of the installation form of the double floor 1 will be described.
In installing the double floor 1, first, a plurality of floor support units 3 are installed on the base surface 2 at a predetermined pitch corresponding to the shape of the floor base material 4. Then, the floor base material 4 is installed on the support plate 10 of each floor support unit 3 with the edge of the floor base material 4 supported. In this case, the adhesive reservoir 29 of the support plate 10 of the floor support unit 3 is installed in a state exposed from the edge of the floor base material 4. Here, the floor support unit 3 may be first attached to the lower surface of the floor base material 4, and the floor base material 4 may be installed on the foundation surface 2. The support plate 10 and the floor base material 4 of each floor support unit 3 are fixed through an adhesive sheet or the like.

Then, a rotation tool is inserted from above the adhesive reservoir 29 of the support plate 10 of the floor support unit 3, and the tip of the rotation tool is fitted into the engagement portion 22 of the hollow support bolt 18 to rotate the hollow support bolt 18. The floor surface level of the floor base material 4 supported by the support plate 10 is adjusted.
Further, the adjacent floor base material 4 is similarly placed on the floor support unit 3 that has already been installed with a predetermined gap that can adjust the level of the floor base material 4 and fixed on the floor support unit 3.

  Such an operation is repeated with the floor base material 4, the floor base material 4 is uniformly laid on the foundation surface 2, the floor level is adjusted, and then the floor exposed in the gap between the adjacent floor base materials 4. An adhesive is injected into the adhesive reservoir 29 of the support unit 3. Here, the center placement hole of the hollow support bolt 18 of the support leg 9 and the center hole 11 of the cushioning material 8 communicate with each other. Therefore, after laying the floor base material 4 and adjusting the floor surface level, when an adhesive is injected from the adhesive reservoir 29 formed on the upper part of the level adjusting nut 19, the adhesive is separated from the level adjusting nut 19. It diffuses and penetrates into the threaded portion between the hollow support bolts 18 to bond and fix them. In addition, the adhesive injected from the adhesive reservoir 29 diffuses and penetrates into the gap between the floor base material 4 and the support plate 10 to bond and fix between them, and the lower end of the hollow support bolt 18. And the cushioning material 8 are also bonded and fixed. Further, the adhesive injected from the adhesive reservoir 29 also bonds and fixes the cushioning material 8 and the base surface 2.

Then, after the laying of the floor base material 4 on the foundation surface 2 is completed, the high-density fiberboard 5 is laid uniformly on the floor base material 4.
For laying the high density fiberboard 5 on the floor base material 4, the high density fiber board 5 is placed on the floor base material 4, and is fastened to the underfloor seating material 4 by fastening tools B such as nails and screws. .
Here, when the fastening tool B is placed on the high-density fiber board 5, the fastening tool B is placed on the placement part H of the fastening tool B of the high-density fiber board 5 as shown in FIG. The material escapes when installed. And since the high-density fiberboard 5 is formed with a high density of 0.8 (g / cm ³ ) or higher and is difficult to be compressed, the escape of the material generated in the placement portion H is caused by the placement portion H. It is not absorbed around, but protrudes from the periphery of the placement portion H on each surface in the vertical direction of the high-density fiberboard 5 to form a convex portion C.

However, since the slits S are formed on the upper and lower surfaces of the high-density fiber board 5 in the region including the placement part H where the fastening device B is placed, the convex part C has the high-density fiber board 5. It is possible to avoid projecting outward from the upper and lower surfaces.
Then, after the laying of the high-density fiber board 5 on the floor base material 4 is completed, the floor finishing material 6 is uniformly laid on the high-density fiber board 5 to complete the installation of the double floor 1.
According to the double floor 1 having the above-described configuration, the vibration of the floor foundation panel 4 can be suppressed by interposing the high-density fiberboard 5 between the floor foundation panel 4 and the floor finishing material 6. The performance can be improved.

Further, according to the double floor 1, the slits S are formed in the high density fiber board 5 laid between the floor base material 4 and the floor finishing material 6, so that the fastener to the high density fiber board 5 is provided. It becomes possible to avoid a construction failure caused by the protruding portions C formed around the placing portion H at the time of placing B projecting outward from the upper and lower surfaces of the high-density fiberboard 5.
Although the embodiments of the present invention have been described above, various modifications can be made in the embodiments of the present invention.
For example, the shape and dimensions of the slits S formed on the upper and lower surfaces of the high-density fiberboard 5 can be set as appropriate.

Next, a test example of the floor impact sound level for the double floor 1 will be shown to specifically explain the effect of the present invention.
FIG. 5 is a schematic configuration diagram of a laboratory for testing a floor impact sound level. FIG. 6 is a diagram showing test results of the floor impact sound level test.
In the following test examples, the measurement method and evaluation of the floor impact sound level were performed in accordance with the provisions of JIS A1418: 2000 (measurement method for floor impact sound insulation performance of buildings).
Measuring method:
As an experimental room, as shown in FIG. 5, an experimental building 33 is divided into an upper sound source room 31 and a lower sound receiving room 32 by a foundation floor 30 made of a concrete slab (RC floor slab) having a thickness of 150 mm. It was. In the sound source room 31, a double floor 34 serving as a test body is constructed on the foundation floor 30, and a measurement target floor 35 is configured from the foundation floor 30 and the double floor 34.

Two types of floor impact sound generators 36 are used: a lightweight floor impact sound generator (tapping machine) and a heavy floor impact sound generator (bang machine). Sound is picked up by a microphone 37 installed in the sound chamber 32, picked up by a precision sound level meter 39 of a sound receiving device 38, and is received by an octave analyzer 40 for each frequency band of 1/1 octave band. Sound pressure level was recorded. The frequency bands are 63 Hz, 125 Hz, 250 Hz, 500 Hz, 1,000 Hz (1 kHz), 2,000 Hz (2 kHz), and 4,000 Hz (4 kHz), and the higher the number, the higher the sound.
The height of the sound receiving chamber microphone was 1200 mm.

Specimen:
Specimen A has a double floor structure according to a comparative example. YP-110 type support legs (support leg spacing: 458 mm × 615 mm) as a floor support unit, particle board (1820 mm × 600 mm × 20 mm) as a floor base material, floor finish A color floor (1818 mm x 303 mm x 12 mm) is applied as a material, and a high-density fiberboard (1820 mm x 910 mm x 9 mm) made of wood chips and plastic pellets is laid between the floor base material and the floor finishing material It is.
The test body B has a double floor structure according to the present invention example, and slits S are formed on the upper and lower surfaces of the high-density fiberboard of the test body A.

Test results:
As is clear from the results shown in FIG. 6, the double floor according to the example of the present invention in which the slits S are formed on the upper and lower surfaces of the high-density fiberboard is a comparative example in which the slits S are not formed in the high-density fiberboard. Compared with the double floor according to No. 4, the floor impact sound insulation performance is almost equivalent.
Therefore, according to the double floor according to the present invention, the projecting portion formed around the placement portion is high when the fastening device is placed on the high-density fiberboard while exhibiting excellent floor impact sound blocking performance. It becomes possible to avoid the construction failure resulting from projecting outward from the upper and lower surfaces of the density fiberboard.

It is a perspective view of the double floor which concerns on embodiment of this invention. It is side surface sectional drawing of a floor support unit. It is a perspective view of the high-density fiber board concerning the embodiment of the present invention. It is side surface sectional drawing which shows the state which laid between the floor base material and the floor finishing material. It is a schematic block diagram of the laboratory which tests a floor impact sound level. It is a figure which shows the test result of the test of a floor impact sound level. It is a perspective view of the double floor concerning patent documents 1. It is side surface sectional drawing which shows the state which laid between the floor base material and the floor finishing material the high density fiber board which concerns on patent document 1. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Double floor 2 Base surface 3 Floor support unit 4 Floor base material 5 High density fiber board 6 Floor finishing material 8 Buffer material 9 Support leg 10 Support plate 11 Center hole part 12 Recessed part 13 Bottom face 14 Groove part 15 Protrusion 18 Hollow support bolt 19 Level adjustment nut 20 Protruding part 21 Male thread part 22 Engaging part 24 Female thread part 25 Support part 27 Insertion hole 28 Chamfering part 29 Adhesive reservoir S Slit B Fastening tool H Placing part C Convex part 30 Foundation floor 31 Sound source Chamber 32 Sound receiving chamber 33 Laboratory building 34 Double floor 35 Floor to be measured 36 Floor impact sound generator 37 Microphone 38 Sound receiving device 39 Precision sound level meter 40 Octave analyzer 50 Sound insulation floor structure 51 Base surface 52 Elastic base 53 Support leg Group 54 Floor base panel 55 Floor finishing material 56 High-density fiberboard A Clearance

Claims (4)

A high-density fiberboard having a density of 0.8 (g / cm ³ ) or more that is fastened as a flooring by a fastening tool,
A slit is formed in each of the upper and lower surfaces of the high-density fiberboard in a region including a placement portion where the fastener is placed. A plurality of the placement portions are formed in a row,
The high-density fiberboard according to claim 1, wherein the slits are continuously formed in a direction in which the plurality of the placement portions formed in a row are extended.   The high-density fiberboard according to claim 1 or 2, wherein the slit is formed to have a width that is twice or more the diameter of the fastening device to be placed. A floor structure comprising a floor base material laid on a foundation surface and a floor finishing material laid on the floor base material,
The floor structure characterized by laying the high-density fiber board of any one of Claims 1 thru | or 3 between the said floor base material and the said floor finishing material.

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