JP2024039762A - floor structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a floor structure capable of suppressing use of lumber.

SOLUTION: A floor structure comprises: a plurality of first support members 20 aligned on a floor slab 10; a plurality of first boards 30 that have peripheries 31 supported by the plurality of first support members 20, are aligned with spaces 71 and held above the floor slab 10; a plurality of second support members 45 that are aligned on the first boards 30 or covering materials 40 stacked on the first boards 30; and a plurality of second boards 50 that have peripheries 51 supported by the plurality of second support members 45, are aligned with spaces 73 and held above the first boards 30 or the covering materials 40. The first board 30 is either one of a cement plate, a gypsum board, or an ALC board. A top face 221 of the first support member 20 on which the peripheries 31 of the first boards 30 are placed and a lower surface 45A of the second support member 45 placed on the peripheries 31 of the first boards 30 are vertically aligned. A sound insulation material may be provided in a space S2 formed under the second board 50.

SELECTED DRAWING: Figure 2

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention relates to a floor structure with high sound insulation properties constructed on the floor slab of a building.

BACKGROUND OF THE INVENTION Floor structures such as floors of apartment complexes and office buildings improve sound insulation by providing a space between the flooring or carpet that constitutes the walking surface and the floor slab such as a flat plate or concrete slab.

FIG. 8 shows a conventional floor structure 100. The floor structure 100 includes a plurality of boards 130 made of particle material laid through support legs 120 erected on a concrete slab 110 as a floor slab, and a plurality of support pedestals 135 placed on the boards 130. A plurality of boards 140 made of particle material to be laid, a sound insulation sheet 151 laid on the board 140, a gypsum board 152 placed on the sound insulation sheet 151, and a flooring placed on the gypsum board 152. board 160.

In the floor structure 100, a first space (first air layer S1'') is provided between the concrete slab 110 and the board 130, and a second space (second air layer S2'') is provided between the board 130 and the board 140. This floor structure 100 is excellent at reducing heavy floor impact noise caused by soft but heavy impacts, such as when a child jumps or bounces or when a heavy object is dropped on the floor surface. Such a floor structure 100 is disclosed in Patent Document 1.

Japanese Patent Application Publication No. 2018-12936

In the floor structure 100 shown in FIG. 8, the board 130 and the board 150 use a board such as particle board. For example, if particle board or its raw materials are in short supply in the market, construction may not be possible until particle board is prepared. For this reason, it is desirable to replace part of the particle board with a non-wood material to construct the floor structure while reducing the use of wood.
Therefore, an object of the present invention is to provide a floor structure that can reduce the use of wood.

The floor structure of the present invention includes a plurality of first support members lined up on the floor slab, and a plurality of first support members that support the periphery of the floor slab and are lined up with a first gap between the floor slabs. a plurality of first boards held above; a plurality of second support members arranged on the first boards or on a covering material overlaid on the first boards; a plurality of second boards whose peripheral edges are supported by a support member, which are arranged with a second gap therebetween and held above the first board or the covering material, the first board being cement-covered; The upper surface of the first supporting member on which the peripheral edge of the first board is placed and the lower surface of the second supporting member resting on the peripheral edge of the first board are any of a board, a plasterboard, or an ALC board. They are lined up and down.

In the present invention, in the first board, the load from the surface material is always received by the peripheral portion supported by the first support member, specifically, a part of the peripheral portion; No load is applied to a central portion of the first board that is not supported by one support member or to a portion located between two first support members. Therefore, the first board is prevented from being damaged due to cracks occurring in the first board due to the load.
Furthermore, if a board having strength to withstand a load approximately equal to the average weight of an adult male is used as the first board, a worker can work on the first board during construction.

In the floor structure of the present invention, preferably, a sound insulating material is provided in a space configured under the second board.

In the present invention, floor impact sound propagating in the space under the second board is attenuated by the sound insulating material. Thereby, for example, the propagation of floor impact sound to the floor below can be further reduced.

The floor structure of the present invention preferably includes a first wall support member that is provided on the floor slab and supports a wall edge of the first board that is provided near the wall and that faces the wall; A second wall support member that is provided on the wall edge of one board and supports the wall edge of the second board that is provided above the wall edge of the first board and that faces the wall. and a top surface of the first wall support member on which the wall edge of the first board is placed and a bottom surface of the second wall support member that rests on the wall edge of the first board are arranged in a vertical direction. They are lined up.

In the present invention, in the first board provided near the wall, the load from the surface material is always applied to the wall edge supported by the first wall support member, specifically, to the wall edge. The load is received at the central part of the first board that is not supported by the first wall support member, or the part located between the two first wall support members and the first support member. has no effect. Therefore, the first board is prevented from being damaged due to cracks occurring in the first board due to the load. If a board having strength to withstand a load equivalent to the average weight of an adult male is used as the first board installed against the wall, a worker can work on the first board during construction.
The floor structure of the present invention preferably includes an asphalt-based vibration damping material that covers the plurality of second boards and the second gap.

According to the present invention, since the first board is made of a cement board or the like, the use of wood can be reduced.

FIG. 2 is a plan view of a floor structure according to a first embodiment and a second embodiment of the present invention. (a) is a cross-sectional view of the floor structure according to the first embodiment of the present invention taken along line A1-A1 in FIG. 1, and (b) is a cross-sectional view showing another example of the configuration of the first board. FIG. 2 is a sectional view of the floor structure according to the first embodiment of the present invention taken along line A2-A2 in FIG. 1. FIG. (a) is a diagram for explaining the operation of the floor structure according to the first embodiment of the present invention, and (b) is a diagram for explaining the operation of the conventional floor structure. (a) is a sectional view of the floor structure according to the second embodiment of the present invention taken along line A3-A3 in FIG. 1, and (b) is a sectional view of the floor structure according to the second embodiment taken along line A4-A4 in FIG. It is a sectional view of such a floor structure. (a) is a diagram for explaining the operation of the floor structure according to the second embodiment of the present invention, and (b) is a diagram for explaining the operation of the conventional floor structure. It is a sectional view showing a floor structure concerning a third embodiment of the present invention. FIG. 2 is a cross-sectional view of a conventional floor structure.

Embodiments of the present invention will be described below with reference to the drawings.
(First embodiment)
As shown in FIGS. 1 to 3, the floor structure 1 of the first embodiment includes a plurality of first support members 20 arranged vertically and horizontally at intervals on a concrete slab 10, and a plurality of first supports A plurality of first boards 30 supported by the member 20, a plurality of covering materials 40 covering the plurality of first boards 30, and a plurality of support pedestals 45 (first 2 support members), a plurality of second boards 50 supported by a plurality of support pedestals 45, and a plurality of surface materials 60 provided on the plurality of second boards 50.

In addition, in the plan view of the floor structure 1 of FIG. 30 is partially covered.

The first support member 20 includes support legs 21 rising from the slab 10 and a plate-shaped panel mounting portion 22 held at a high position by the support legs 21 and on which the first board 30 is placed.
As shown in FIG. 2(a), the support leg 21 includes a vibration-proofing pedestal 21A made of vibration-proofing rubber arranged on the slab 10, and an adjuster bolt 21B supported perpendicularly to the vibration-proofing pedestal 21A. ing. The panel mounting portion 22 is formed in the shape of a square block in plan view with a through hole (not shown) formed in the center, and a female screw member that can be screwed into the adjuster bolt 21B is fixed in the through hole. , a panel mounting portion 22 is provided on the adjuster bolt 21B. In the first support member 20, the height of the panel mounting portion 22 can be changed by turning the adjuster bolt 21B, and the height and level of the first board 30 can be adjusted. The panel mounting section 22 is made of wood or resin, and can be made of, for example, a particle board made of wood chips obtained from waste wood hardened with adhesive.

The first board 30 may be a cement board, an ALC (autoclaved lightweight aerated concrete) board, a gypsum board, or the like.
As the cement board, for example, an extruded cement board specified in JISA5441 (2003) can be used, and the first board 30 as the extruded cement board has a plurality of boards lined up in the width direction as shown in FIG. 2(b). It has a hollow part 30A. Each hollow portion 30A extends in the longitudinal direction from one short edge of the first board 30 to the other short edge.
As the gypsum board, for example, "reinforced gypsum board (GB-F)" specified in JISA 6901, which is reinforced by mixing inorganic fibers into the core, can be used, and the thickness is, for example, 21 mm.
As the ALC board, for example, a thin panel having a thickness of 35 mm or more and less than 75 mm as defined in JISA5416 (2016) can be used.
These first boards 30 are formed to a predetermined size, and can be used by adjusting the size according to the size of the room (space) of the building when installing.
In the floor structure 1, a plurality of first boards 30 are arranged in the vertical direction and the horizontal direction. The plurality of first boards 30 are level-adjusted by the first support member 20 and held above the slab 10. The first board 30 has, as a peripheral edge 31, a corner formed by a short edge and a long edge, and a part in the middle of the long edge in the longitudinal direction of the panel mounting part 22 of the first support member 20. It is placed on the upper surface 221 and supported by the first support member 20 . The locations where the first board 30 is supported by the first support members 20 are not limited, and the number of first support members 20 may be increased so as to support locations inside the peripheral edge.

In the floor structure 1, the first board 30 is placed apart from the surrounding first boards 30 and the wall 15 of the structure, and there is a gap 71 (corresponding to the first gap) between the first boards 30 installed in parallel. ), and a gap 72 is also provided between the peripheral edge 31 and the wall 15 of the first board 30 that is placed close to the wall 15.
For example, the gap 71 is set to 12 mm between the peripheral edges 31 of the first boards 30, and the gap 72 is set to 12 mm between the peripheral edges 31 of the first boards 30 and the wall 15. However, the distance between these gaps 71 and 72 can also be set to different dimensions (for example, 20 mm).

In addition, in the floor structure 1, a joist unit 90 shown in FIG. It supports a part of the peripheral edge 31 (wall edge 31A shown in FIG. 5(a), which will be described later). Instead of the joist unit 90, the wall edge 31A of the first board 30 may be supported by using lumber stacked on the slab 10 as the first wall support member. In FIG. 1, a cross section of the wall 15 is shown with hatching.

The covering material 40 covers the first board 30 and also covers the gap 71 formed between the first boards 30 arranged in parallel.
As the covering material 40, any one of a rubber sheet, an asphalt-based damping material, a gypsum board, a cement board, a plywood, a particle board, etc., or a combination thereof can be used. The dimensions of the covering material 40 are not limited, and are formed in a rectangular shape with a thickness of 4 mm or more, a long side L of 910 mm or more and 1000 mm or less, and a short side W of 450 mm or more and 500 mm or less.
The rubber sheet, asphalt-based damping material, gypsum board, cement board, plywood, and particle board are not limited in structure or material, and various types can be used.
The covering material 40 is also formed to a predetermined size, and the size can be adjusted according to the size of the room (space) of the building when it is installed.

The illustrated covering material 40 includes an asphalt-based damping material 41 provided on the upper surface of the first board 30, and a gypsum board 42 provided overlappingly on the asphalt-based damping material 41. , consists of. The asphalt-based damping material 41 is formed into a plate shape by mixing iron powder with asphalt and providing non-woven fabric on the front and back surfaces, and the thickness of the asphalt-based damping material 41 is, for example, 4 mm or more and 12 mm or less. The gypsum board 42 is a "normal hard gypsum board (GB-RH)" with a thickness of 12.5 mm as specified in JISA6901. In addition, in FIG. 1, the boundaries between the plurality of asphalt-based damping materials 41 are omitted, and the boundaries between the plurality of gypsum boards 42 are also omitted, but the plurality of asphalt-based damping materials 41 are It is laid on the upper surface of the first board 30 so as not to form a gap with the vibration material 41. The plurality of gypsum boards 42 are also preferably provided on the upper surface of the asphalt-based vibration damping material 41 so as not to form a gap between the gypsum boards 42 installed in parallel.

The support pedestal 45 as a second support member is formed in a block shape, and has a lower surface 451 that comes into contact with the covering material 40, and an upper surface 452 that is formed on the opposite side of this lower surface 451 and on which the second board 50 is placed. For example, the upper surface 452 has a square shape in plan view. The support base 45 is made of wood or resin, and can be made of, for example, the same particle board as the first board 30. Further, as shown in FIG. 2(a), the support pedestal 45 is arranged at the same position as the first support member 20 in the horizontal direction, and the first support member 20 and the support pedestal 45 are aligned on a vertical line. placed in the state.

The second board 50 is a board such as particle board or plywood, and preferably has a bending strength of 18.0 N/mm 2 or more in the vertical direction, 18.0 N/mm ² or more in the lateral direction, and a thickness of 20 mm as specified by JISA5908. Use a base particle board (non-polished board, polished board) with a thickness of 40 mm or less. In the illustrated example, the second board 50 has a thickness of 20 mm and is formed in a rectangular shape.
The second board 50 is formed to a predetermined size, and when it is installed, the size can be adjusted according to the size of the room (space) of the building.
In the floor structure 1, a plurality of second boards 50 are arranged in the vertical direction and the horizontal direction. These plurality of second boards 50 are held above the covering material 40 by a support pedestal 45. The second board 50 is mounted on a plurality of support pedestals 45 (second support members) by placing the corner formed by the short edge and the long edge and a midway point in the longitudinal direction of the long edge on the support pedestal 45. I feel supported.
In addition, in the floor structure 1, apart from the support pedestal 45 as the second support member, a part of the peripheral edge facing the wall 15 of the second board 50 provided close to the wall 15 (see FIG. 5(a) described below) A support pedestal 46 serving as a second wall support member that supports the wall edge 51A shown in FIG. The second board 50 near the wall is supported using a plurality of support pedestals 45 and support pedestals 46.
In the floor structure 1, as shown in FIGS. 1 and 2(a), the second board 50 is placed apart from the surrounding second boards 50 and the wall 15, and there is a space between the second boards 50 arranged in parallel. A gap 73 (corresponding to a second gap) is formed in the second board 50 , and a gap 74 is also provided between the peripheral edge 51 of the second board 50 and the wall 15 .
For example, the gap 73 is set to 12 mm between the peripheral edges 51 of the second board 50, and the gap 74 is set to 12 mm between the peripheral edge 51 of the second board 50 and the wall 15. However, the intervals between these gaps 73 and 74 can also be set to different dimensions (for example, 20 mm).

The second board 50 is formed into a rectangular shape having the same or substantially the same external shape as the first board 30 in plan view, and the peripheral edge 51 of the second board 50 is located above the peripheral edge 31 of the first board 30. placed in position.

The surface material 60 is a flooring board that is provided directly above the plurality of second boards 50 and constitutes a single-layer or multi-layer flooring whose smooth surface appears in the living space.

The floor structure 1 configured in this manner is constructed, for example, as a dry sound insulating floor for an apartment complex.

(Construction method)
In the floor structure 1, for example, the support legs 21 of the first support member 20 are arranged side by side on the slab 10 at predetermined intervals. Further, the peripheral edge part 31 of the first board 30 is placed on the upper surface 221 (placing surface) of the panel mounting part 22 of each first support member 20, and the peripheral edge part 31 is fixed to the panel mounting part 22 with screws or nails. do. At this time, the upper end of the adjuster bolt 21B of the support leg 21 is placed in the gap 71 between each first board 30.
Then, by rotating the adjuster bolt 21B using a tool as necessary from above the first board 30 and moving the panel mounting part 22 up and down, the height of each first board 30 is made equal and the top surface is level. Adjust the level so that Thereby, the plurality of first boards 30 are held above the slab 10.
Next, the covering material 40 is placed on the first board 30. Specifically, a plurality of asphalt-based damping materials 41 are laid on the top surface of a plurality of first boards 30 so that no gaps are created between the asphalt-based damping materials 41, and the asphalt-based damping materials 41 are used to The upper surface of the first board 30 and the plurality of gaps 71 between the first boards 30 are covered. A plurality of gypsum boards 42 are laid on these asphalt-based vibration damping materials 41 so that no gaps are left between the gypsum boards 42.
Furthermore, a plurality of support pedestals 45 are placed on the peripheral edge 31 of the first board 30 via the covering material 40. At this time, the lower surfaces 451 of the plurality of support pedestals 45 that rest on the covering material 40 and the peripheral edge portion 31 are respectively arranged above the upper surface 221 of the panel mounting section 22. After fixing the support pedestal 45 to the gypsum board 42 with screws, nails, etc., place the peripheral edge 51 of the second board 50 on the upper surface 452 of the support pedestal 45, and attach the peripheral edge 51 of the second board 50 to the support pedestal 45 with screws or the like. Fixed to. Thereby, the plurality of second boards 50 are held above the gypsum board 42. Finally, the floor structure 1 is completed by laying the plurality of surface materials 60 directly above the plurality of second boards 50.

In the floor structure 1, as shown in FIG. 2(a), a first space (first air layer S1) is formed between the slab 10 and the first board 30, and the covering material 40 and the second board 50 are A second space (second air layer S2) is formed between the two.

In this floor structure 1, the first air layer S1 between the upper surface of the slab 10 and the lower surface of the first board 30 has a thickness T1 of, for example, 45 mm or more and 1200 mm or less, depending on the installation status of equipment piping, wiring, etc. The thickness T2 of the second air layer S2 between the upper surface of the covering material 40 and the lower surface of the second board 50 is, for example, 10 mm or more and 60 mm or less, preferably 12 mm or more and 30 mm or less.

According to the floor structure 1 of the first embodiment, since the first board 30 is made of a cement board or the like, it is possible to suppress the use of wood.
In addition, in the floor structure 1, in the first support member 20 and the support pedestal 45 (second support member) arranged on the vertical line, the support pedestal presses the load from the second board 50 onto the peripheral edge 31 of the first board 30. The lower surface 451 of the first board 45 and the upper surface 221 of the panel mounting section 22 that receives the peripheral edge 31 of the first board 30 are aligned in the vertical direction.
As a result, the load from the surface material 60 is always received by the peripheral edge 31 of the first board 30 supported by the first support member 20, specifically, a part of the peripheral edge 31, and the first support No downward load is applied to the central portion of the first board 30 that is not supported by the members 20 or to the portion located between the two first support members 20. Therefore, damage to the first board 30 due to cracks occurring in the first board 30 due to the load is prevented. Furthermore, since the first board 30 has strength against a load approximately equal to the average weight of an adult male, a worker can work on the first board 30 during construction.

FIG. 4(a) shows the state of propagation of weight impact sound when a heavy object W1 indicated by a dashed line located at a distant position above the surface material 60 is dropped onto the surface material 60. The sound is reduced by the first board 30, the covering material 40, etc., and propagates to the first air layer S1 and the slab 10.

According to the floor structure 1 of the first embodiment of the present invention, by covering the gap 71 provided between the plurality of first boards 30 and the first boards 30 arranged in parallel with the covering material 40, Communication between the second air layer S2 (space) and the first air layer S1 (space) is blocked. As a result, the weight impact sound v propagates to the first air layer S1 via the first board 30, and the weight impact sound further propagates to the slab 10 through the gap 71 provided between the first boards 30 installed in parallel. can be reduced. In this state where the air communication between the first air layer S1 (space) and the second air layer S2 (space) is cut off, the first board 30 functions as a shield that reduces heavy floor impact noise. do. This can further reduce propagation to the downstairs.

In the conventional floor structure 100, as shown in FIG. 4(b), the plurality of boards 130 and the gaps 171 provided between the boards 130 arranged in parallel are not covered with the covering material 40. In this way, when the first air layer S1' (space) and the second air layer S2' (space) are in communication, the heavy floor impact sound v2' propagating from the gap 171 to the first air layer S1' is large. If the board 130 is present, the function of the board 130 as a shield to reduce heavy floor impact noise may be reduced.

In addition, in the floor structure 1 of the first embodiment of the present invention, the intermediate sound vm that propagates from the second air layer S2 to the covering material 40 propagates from the second air layer S2' to the board 130 in the conventional floor structure 100. Although it is larger than the intermediate sound vm' (<vm), by providing the covering material 40 directly under the second air layer S2, the weight impact sound v propagating to the first air layer S1 is lower than the weight impact sound v1 of the floor structure 100. '.

(Second embodiment)
(a) and (b) of FIG. 5 are cross-sectional views of the floor structure 2 of the second embodiment along the A3-A3 line and the A4-A4 line of FIG. Compared to the floor structure 1 of this embodiment, a sound insulating material 80 is provided in the second space (second air layer S2) between the covering material 40 and the second board 50.
The same components as the floor structure 1 of the first embodiment are given the same reference numerals, and the explanation thereof will be omitted.

The sound insulating material 80 is made of a material different from the main constituent material of the covering material 40. As the sound insulating material 80, for example, glass wool, rock wool, or a resin foam molded product can be used. Glass wool or rock wool can be formed into a cotton-like shape or a board-like shape, and polystyrene or the like can be used. You can also use foam molded boards.

In addition, in FIG. 5(a), the reference numeral 90 is a joist unit, and the joist unit 90 is supported vertically by a vibration-proofing pedestal 91 made of anti-vibration rubber arranged on the slab 10 and this vibration-proofing pedestal 91. The horizontal member 93 is provided with an adjuster bolt 92 that is arranged at a distance in the longitudinal direction and supported by a plurality of adjuster bolts 92. The height and horizontal level of the upper surface of the horizontal member 93 can be adjusted using adjuster bolts 92. On the upper surface 931 of the horizontal member 93, a part of the peripheral edge 31 of the first board 30 provided near the wall 15 (Fig. In the illustrated example, one long side edge) is placed. This cross member 93 is provided along the wall 15 and away from the wall 15. Further, in FIG. 5A, reference numeral 95 is an elastic body made of rubber, foamed polyethylene, or the like, and is sandwiched between the cross member 93 and the wall 15. As shown in FIG. The elastic body 95 is provided, for example, at one end side and the other end side of the cross member 93, and as shown in FIG. Not provided. Further, reference numeral 96 is a baseboard provided on the wall 15. The edge of the first board 30 that is supported by the cross members 93 and faces the wall 15 (hereinafter referred to as the wall edge) is designated by a reference numeral 31A.

A support pedestal 46 is provided on the covering material 40 stacked on the wall edge 31A of the first board 30. and an upper surface 462 on which the wall edge 51A along the wall 15 of the second board 50 is placed. In addition, as for the structure near the wall 15 of the floor structure 2, in the horizontal member 93 and the support pedestal 46 arranged on the vertical line, the lower surface 461 of the support pedestal 46 resting on the wall edge 31A of the first board 30 and the first board The upper surface 931 of the cross member 93 on which the wall edge 31A of the 30 is placed is aligned in the vertical direction.
As a result, the load from the surface material 60 is always received by the peripheral edge 31 of the first board 30 supported by the horizontal members 93, specifically, a part of the wall edge 31A, and the load from the surface material 60 is always received by the horizontal members 93. No downward load acts on the unsupported central portion of the first board 30 or the portion located between the cross member 93 and the first support member 20. Therefore, damage to the first board 30 due to cracks occurring in the first board 30 due to the load is prevented.

FIG. 6(a) shows the state of propagation of weight impact sound when a heavy object W1 indicated by a dashed line located at a distant position above the surface material 60 is dropped onto the surface material 60. The sound is further reduced by the first board 30, the sound insulating material 80, and the covering material 40, and propagates to the first air layer S1 and the slab 10.

According to the floor structure 2 of the second embodiment of the present invention, the gap 71 provided between the plurality of first boards 30 and the first boards 30 arranged in parallel is covered with the covering material 40, and the sound insulating material 80 in the second air layer S2, the weight impact sound v21 propagates to the first air layer S1 via the first board 30, and also the gap 71 between the first board 30 and the first board 30 and the wall 15. It is possible to reduce the weight impact sound v23 that propagates to the slab 10 through the gap 72 between the two. This can further reduce propagation to the downstairs.

In the conventional floor structure 100, as shown in FIG. 6(b), gaps 171 provided between the plurality of boards 130 and the boards 130 arranged in parallel are not covered with the covering material 40, so that further improvements can be made. Since the sound insulating material 80 is not accommodated in the second air layer S2' between the board 130 and the upper board 140, the heavy floor impact sound v21' (>v21) propagating from the board 130 to the first air layer S1' is ) increases, and the weight floor impact sound v22' propagates from the gap 171 between the boards 130 to the first air layer S1' and the weight propagates from the gap 172 between the board 130 and the wall 15 to the first air layer S1'. There may be a large floor impact sound v23'.

In addition, in the floor structure 2, the intermediate sound vm2 propagating from the second board 50 to the second air layer S2 is relaxed by the sound insulating material 80, and passes through the gap 72 between the first board 30 and the wall 15 to the slab 10. The heavy floor impact sound v23 propagating to can also be reduced compared to the heavy floor impact sound v23' in the conventional floor structure 100 (v23<v23').
Furthermore, by providing the sound insulating material 80 in the second air layer S2, lightweight floor impact noise can be reduced more than in the floor structure 1 of the first embodiment.

When the thickness T2 of the second air layer S2 is set to 10 mm or more and 60 mm or less, a material thinner than the conventional glass wool placed on the slab 10 can be used as the sound insulation material 80, and the second air layer It can be accommodated in S2 with a high filling rate. This improves sound insulation and further reduces manufacturing costs.
Furthermore, in the floor structure 2, the first air layer S1 is used to arrange the water supply piping P1 on the slab 10, so that even if water leakage occurs in the piping P1, the sound insulating material 80 By being accommodated in layer S2, absorption of water can be avoided.

(Third embodiment)
FIG. 7 is a cross-sectional view of the floor structure 3 of the third embodiment, and compared to the floor structure 1 of the first embodiment, the floor structure 3 does not provide the covering material 40 on the first board 30, The difference is that it is provided between the second board 50 and the surface material 60.
The illustrated covering material 40 is composed of an asphalt-based damping material 41 and a gypsum board 42 laid on the asphalt-based damping material 41. A support member 20, a first board 30 held above the slab 10 by a plurality of first support members 20, a plurality of support pedestals 45 (second support members) arranged on the first board 30, and a plurality of A plurality of second boards 50 held above the first board 30 by a support pedestal 45, a covering material 40 laid on the second board 50, and a surface material 60 provided on the gypsum board 42, It is equipped with
The same components as the floor structure 1 and the like of the first embodiment are denoted by the same reference numerals, and the explanation thereof will be omitted.
The asphalt-based damping material 41 is spread on the second board 50 without any gaps, and covers the upper surface of the second board 50 and the gap 73 between the second boards 50.
In the floor structure 3, the lower surface 451 of the support pedestal 45 rests directly on the peripheral edge 31 of the first board 30. In addition, in the first board 30 near the wall, the lower surface 461 of the support pedestal 46 as the second wall support member rests directly on the wall edge 31A of the first board 30.
Also in this floor structure 3, since the first board 30 is made of a cement board or the like, the use of wood can be reduced.

The present invention can be implemented without being limited to the above description and illustrated examples.

Of course, the present invention can be installed not only in houses but also on floor slabs made of flat plates of wooden buildings, and furthermore, it can be installed in buildings whose frames are made of steel frames, cross-laminated timber (hereinafter referred to as CLT boards), etc. The floor slab is supported by steel frames or CLT boards, and it can also be installed on floor slabs made of gypsum board, flat plates, etc. Furthermore, the present invention can also be used in buildings whose floor slabs are made of CLT boards. The arrangement of the first support member and the second support member, the arrangement of the first board and the second board supported by these, the floor plan of the living space, etc. are not limited to the illustrated example.

In the above embodiment, a flooring board is used as the surface material 60, but carpets, PVC sheets, etc. can also be used as the surface material.
Further, in the floor structure shown in FIG. 2, an asphalt-based damping material may be provided between the second board 50 and the surface material 60. The shape of the asphalt-based damping material is not limited to a plate shape, but may be a sheet shape that can be rolled up. In the floor structure shown in FIG. 5, the asphalt vibration damping material may be omitted. In the floor structure shown in FIG. 7, the sound insulating material 80 such as glass wool may be omitted.
The cement board constituting the covering material 40 can be, for example, a slag gypsum board with a thickness of 8 mm ("fiber-reinforced cement board" specified in JISA 5430), preferably blast furnace slag produced as a by-product from factories etc. It is best to use products made from recycled materials such as slag, plaster, and waste paper.

The present invention can be used not only for ordinary houses and apartments but also for office floors.
As the first support member, it is also possible to use a vibration-isolating pedestal 21A made of anti-vibration rubber, which has a pedestal made of particle board, plywood, etc. on which the lower end of the support leg is placed, and this pedestal is used as a floor plate. It may be placed on top.

1, 2, 3 Floor structure 10 Slab (floor slab)
20 First support member 21 Support leg 22 Panel mounting part 221 Top surface 30 First board 40 Covering material 41 Asphalt-based vibration damping material 42 Gypsum board 45 Support pedestal 451 Bottom surface 46 Support pedestal 461 Bottom surface 50 Second board 55 Gypsum board 60 Surface Material 71 Gap (first gap)
72 Gap 73 Gap (Second Gap)
74 Gap 80 Sound insulation material 90,90A Joist unit 91 Anti-vibration pedestal 911 Bottom surface 93 Cross member 931 Top surface S1 First air layer (space)
S2 Second air layer (space)

Claims (4)

a plurality of first support members arranged on the floor slab;
a plurality of first boards whose peripheral edges are supported by the plurality of first support members, and which are arranged with a first gap and held above the floor slab;
a plurality of second support members arranged on the first board or on a covering material overlaid on the first board;
a plurality of second boards whose peripheral edges are supported by the plurality of second support members, which are arranged with a second gap and held above the first board or the covering material;
The first board is a cement board, a gypsum board, or an ALC board,
The upper surface of the first support member on which the peripheral edge of the first board is placed and the lower surface of the second support member that rests on the peripheral edge of the first board are aligned in the vertical direction. floor structure. The floor structure according to claim 1, characterized in that a sound insulating material is provided in a space formed under the second board. a first wall support member provided on the floor slab and supporting a wall edge opposite to the wall of the first board provided near the wall;
Provided on the wall edge of the first board, or provided on the covering material overlaid on the wall edge, and at a position above the wall edge of the first board. a second wall support member that supports a wall edge opposite to the wall of the second board provided;
The upper surface of the first wall support member on which the wall edge of the first board is placed and the lower surface of the second wall support member that rests on the wall edge of the first board are aligned in the vertical direction. The floor structure according to claim 1 or claim 2, characterized in that: The floor structure according to claim 1 or 2, further comprising an asphalt-based vibration damping material that covers the plurality of second boards and the second gap.

Images