JP7684201B2 - double floor - Google Patents

Description

The present invention relates to a double floor.

In double floors used in architectural structures such as apartment buildings, the flooring is supported by multiple support legs erected on the floor slab. This type of double floor allows the space under the floor to be used as a piping route, and makes it difficult for impact sounds generated on the top surface of the flooring by walking or falling objects to be transmitted through the floor slab to rooms on the floor below.

The double floor described above has multiple wall edge support legs erected in the wall edge areas of the floor slab and multiple central support legs erected in the central area of the floor slab, and the wall edge support legs and central support legs are each erected on the floor slab via elastic members. Furthermore, the double floor described above has wooden edge joists supported by each wall edge support leg, and the edge joists and each central support leg support the floor material (see, for example, Patent Document 1).

JP 2016-148217 A

In the conventional double flooring mentioned above, the distance between adjacent wall-side support legs is set to approximately 0.3m to 0.6m, and the distance between adjacent central support legs is set to approximately 0.4m to 0.6m. In this configuration, the area of flooring supported by one wall-side support leg is significantly smaller than the area of flooring supported by one central support leg. Therefore, the weight supported by one wall-side support leg is significantly smaller than the weight supported by one central support leg.

The smaller the weight that the support legs that support the flooring bear, the higher the resonant frequency of the support legs. In conventional double flooring, the weight that the support legs bear is small, so there is a problem that the soundproofing effect of the wall-side areas is reduced.
Furthermore, if the spacing between adjacent wall support legs is increased, the weight that each wall support leg can bear will increase, but this will cause the wooden edge joists to bend more and the flooring to sink more.

The present invention aims to solve the above problems and provide a double flooring that makes it difficult for impact sounds generated on the upper surface of the flooring material to be transmitted in both the central area and wall edge areas of the floor slab.

In order to solve the above problem, the present invention provides a double floor, comprising a plurality of central support legs erected in the central region of the upper surface of a floor slab, and a plurality of wall-side support legs erected in the wall-side region of the upper surface of the floor slab. The double floor also comprises edge joists made of steel or aluminum alloy supported by each of the wall-side support legs, and flooring supported by the edge joists and each of the central support legs. The wall-side support legs comprise a support column extending in the vertical direction, a support member provided at the upper end of the support column, and a screw member protruding upward from the upper end surface of the support column. The support member has an axial cross section formed in a U-shape, the edge joists are fitted into the support member, and the upper end surface of the support column is attached to the lower surface of the support member. The screw member is inserted into the support member, and a tool insertion recess is formed on the upper end surface of the screw member, and the height of the support column can be adjusted by rotating the screw member around the axis. The edge joist has a hole penetrating in the vertical direction, and the screw member is inserted into the hole. The central support leg and the side support leg are each erected on the floor slab via an elastic member. In each side support leg supporting one edge joist, the interval between adjacent side support legs is set to be larger than the interval between adjacent central support legs, and the interval between adjacent side support legs is set to be 1 m or more and 2 m or less.

In the double floor of the present invention, the spacing between each wall-side support leg that supports a single edge joist is large, so the weight borne by each wall-side support leg is large.As a result, the resonant frequency of the wall-side support leg is lower, making it difficult for impact sounds to be transmitted to both the central area and the wall-side area of the floor slab.
In addition, in the double flooring of the present invention, the edge joists are made of steel or aluminum alloy, and have high rigidity. Therefore, even if the interval between the adjacent wall edge supports is increased, the deflection of the edge joists can be kept small, and thus the sinking of the flooring material can be suppressed.

In the double floor described above, by providing a weight member to the wall-side support leg and adjusting the weight borne by each wall-side support leg, the resonant frequency of the wall-side support leg can be easily adjusted.

In the double floor of the present invention , the height of the edge joist can be easily adjusted by inserting a tool such as a screwdriver into the hole from above the edge joist, fitting the tip of the tool into the tool insertion recess, and rotating the screw member.

In the double flooring described above, by providing a weight member to the wall-side support leg and adjusting the weight borne by each wall-side support leg, the resonant frequency of the wall-side support leg can be easily adjusted. At this time, by inserting the screw member through the weight member, the weight member can be easily and compactly attached to the wall-side support leg.

In the double flooring described above, it is preferable to increase the soundproofing effect by setting the resonance frequency of the wall-side support legs and the central support leg to 30 Hz or less.

In the double floor of the present invention, the resonance frequency of the wall-side support legs is lowered, making it difficult for impact sounds to be transmitted to both the central area and the wall-side area of the floor slab, thereby improving the soundproofing effect. In addition, in the double floor of the present invention, since the edge joists are made of steel or aluminum alloy, sinking of the floor material can be suppressed even if the distance between adjacent wall-side support legs is increased.

FIG. 2 is a plan view showing a double floor according to the first embodiment of the present invention. FIG. 2 is a side view showing the central support leg of the double floor according to the first embodiment of the present invention. FIG. 2 is a plan view showing the wall edge support legs and edge joists of a double floor according to the first embodiment of the present invention. FIG. 2 is a side view showing the wall edge support legs and edge joists of a double floor according to the first embodiment of the present invention. This is a VV cross-sectional view of Figure 2 showing the wall edge support legs and edge joists of the double flooring related to the first embodiment of the present invention. A diagram showing the spacing between each central support leg and each wall edge support leg in an embodiment of the double floor of the present invention. 1 is a diagram showing the spacing between each central support leg and each wall edge support leg in an embodiment of a conventional double floor. FIG. This is a graph comparing the results of measuring the impedance level of the upper surface of the floor slab when the upper surface of the floor material is vibrated in the double floor of the present invention and a conventional double floor. FIG. 4 is a plan view showing the wall edge support legs and edge joists of a double floor according to a second embodiment of the present invention. This is a cross-sectional view of Figure 9 showing the wall edge support legs and edge joists of a double floor according to the second embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the accompanying drawings.
In the description of each embodiment, the same components are denoted by the same reference numerals, and duplicate descriptions will be omitted.

[First embodiment]
Fig. 1 is a plan view showing a double floor according to a first embodiment of the present invention. As shown in Fig. 1, the double floor 1A according to the first embodiment is used in architectural structures such as apartment buildings, and constitutes a floor surrounded by walls 3 of a room.
The double floor 1A includes a plurality of central support legs 10 erected in a central region 2A of the upper surface of the floor slab 2, and a plurality of wall-side support legs 20 erected in a wall-side region 2B of the upper surface of the floor slab 2. The double floor 1A also includes a plurality of edge joists 30 supported by each of the wall-side support legs 20, and floor materials 40 supported by each of the edge joists 30 and each of the central support legs 10. Note that part of the floor materials 40 is omitted from the illustration in FIG. 1.

The wall edge region 2B of the floor slab 2 is a rectangular frame-shaped region set along the inner surface of the wall 3. The central region 2A of the floor slab 2 is a rectangular region surrounded by the wall edge region 2B.

Fig. 2 is a side view showing the central support leg of the double floor according to the first embodiment of the present invention. As shown in Fig. 2, the central support leg 10 includes a base 11 installed on the upper surface of the floor slab 2 and a support column 12 extending upward from the base. The base 11 is an elastic member such as a vibration-isolating rubber.
As shown in FIG. 1, in a central region 2A of the floor slab 2, a plurality of central support legs 10 are arranged at intervals in the vertical and horizontal directions of FIG.

Fig. 5 is a cross-sectional view taken along the line V-V in Fig. 2, showing the wall-side support leg and the edge joist of the double floor according to the first embodiment of the present invention. As shown in Fig. 5, the wall-side support leg 20 includes a base 21 installed in the wall-side region 2B of the floor slab 2, a support column 22 extending upward from the base 21, a screw member 23 protruding from the upper end of the support column 22, and a support member 24 provided at the upper end of the support column 22. The base 21 is an elastic member such as a vibration-proof rubber. The support member 24 is placed on the upper end surface of the support column 22.
As shown in FIG. 1, in the wall edge region 2B of the floor slab 2, a plurality of wall edge support legs 20 are arranged at intervals along the inner surface of the wall body 3.

In the wall edge support leg 20 of the first embodiment, a screw member 23 protrudes upward from the upper surface of the support column 22. Fig. 3 is a plan view showing the wall edge support leg and the edge joist of the double flooring according to the first embodiment of the present invention. As shown in Fig. 3, a tool insertion recess 25 is formed on the upper end surface of the screw member 23.
The support member 24 is a member that supports the edge joist 30, and has a U-shaped axial cross section as shown in Fig. 5. The upper end surface of the support column 22 is attached to the lower surface of the support member 24. The screw member 23 is inserted into a through hole formed in the lower part of the support member 24, and protrudes into the support member 24.
In the wall-side support leg 20 of the first embodiment, the screw member 23 is rotated about its axis, so that the column 22 moves up and down relative to the base 21. Therefore, in the wall-side support leg 20, the height of the support member 24 can be adjusted by rotating the screw member 23 about its axis.

The edge joist 30 is a straight metal member made of steel or aluminum alloy and arranged along the inner surface of the wall body 3. In the first embodiment, the edge joist 30 is a hollow member with a rectangular cross section.

4 is a side view showing the wall edge support legs and the edge joists of the double flooring according to the first embodiment of the present invention. As shown in FIG. 4, the edge joists 30 are supported at both ends by the two wall edge support legs 20, and are arranged at a predetermined height.
As shown in Fig. 5, the edge joist 30 is fitted into the support member 24 of the wall edge support leg 20. A hole 31 is formed in the edge joist 30, penetrating it in the vertical direction. The screw member 23 is inserted into the lower part of the hole 31, and the screw member 23 protrudes into the edge joist 30. The upper part of the hole 31 is located directly above the upper end surface of the screw member 23 (see Fig. 3).
Then, a tool such as a screwdriver is inserted into the hole 31 from above the edge joist 30 shown in Figure 3, the tip of the tool is fitted into the tool insertion recess 25, and the screw member 23 is rotated around its axis, thereby moving the support member 24 in the vertical direction and adjusting the height of the edge joist 30.

In the double flooring 1A of the first embodiment, five central support legs 10 are arranged at equal intervals in the horizontal direction of Fig. 1. The horizontally adjacent central support legs 10, 10 are arranged with an interval L1 between them. The central support leg 10 arranged at the end in the horizontal direction is arranged with an interval substantially equal to the interval L1 between the inner surface of the wall body 3.
In the double flooring 1A of the first embodiment, five central support legs 10 are arranged at equal intervals in the vertical direction of Fig. 1. The vertically adjacent central support legs 10, 10 are arranged at an interval L2. The central support leg 10 arranged at the end in the vertical direction is arranged at an interval substantially equal to the interval L2 from the inner surface of the wall body 3.

In the double floor 1A of the first embodiment, two edge joists 30, 30 are arranged in a straight line on each side of the wall 3. As shown in Fig. 4, the two edge joists 30, 30 are supported by three wall edge support legs 20. The three wall edge support legs 20 are arranged at intervals along the inner surface of the wall 3.
Of the three wall-side support legs 20, the wall-side support leg 20 located in the center is located at the boundary between the two edge joists 30, 30 and supports the ends of the two edge joists 30, 30. Of the three wall-side support legs 20, the wall-side support leg 20 located at the end supports the end of one edge joist 30.
1, the central wall-side support leg 20 and one of the wall-side support legs 20 are spaced apart by a distance L3. The central wall-side support leg 20 and the other wall-side support leg 20 are spaced apart by a distance L4.

The flooring 40 is placed on the upper surfaces of the edge joists 30 and on the upper end surfaces of the posts 12 of each central support leg 10. The flooring 40 is supported by each central support leg 10 and each wall edge support leg 20, and is positioned at a predetermined height (see Figures 2 and 5).

In the double floor 1A, as shown in FIG. 1, in each wall-side support leg 20 supporting a single edge joist 30, the distances L3, L4 between adjacent wall-side support legs 20, 20 are set larger than the distances L1, L2 between adjacent central support legs.
Specifically, the distance L3, L4 between adjacent wall-side support legs 20, 20 is 1 m or more and 2 m or less. The distance L3, L4 between adjacent wall-side support legs 20, 20 is preferably 1.2 m or more and 2.0 m or less, and more preferably 1.7 m or more and 2.0 m or less.
Furthermore, the distances L1, L2 between adjacent central support legs 10, 10 are not less than 0.4 m and not more than 0.7 m.

In the double floor 1A, the distances L3, L4 between adjacent wall-side support legs 20, 20 are set so that the weight of the floor material 40 borne by the wall-side support leg 20 is approximately the same as the weight of the floor material 40 borne by the central support leg 10.
Furthermore, in the double floor 1A, the distances L1, L2 between adjacent central support legs 10, 10 and the distances L3, L4 between adjacent wall support legs 20, 20 are set so that the resonance frequencies of the central support leg 10 and the wall support leg 20 are 30 Hz or less.

In the above double floor 1A, as shown in Fig. 1, the spacing between each of the wall-side support legs 20 supporting one edge joist 30 is large, so the weight borne by each wall-side support leg 20 is large, and as a result, the resonance frequency of the wall-side support legs 20 is low, making it difficult for impact sounds to be transmitted to both the central region 2A and the wall-side region 2B of the floor slab 2. Furthermore, by setting the resonance frequency of the central support leg and the wall-side support leg to 30 Hz or less, the soundproofing effect can be improved.
In addition, in the double floor 1A of the first embodiment, the edge joists 30 are made of steel or aluminum alloy, and have high rigidity. Therefore, even if the interval between each wall support leg 20 supporting one edge joist 30 is increased, the deflection of the edge joists 30 can be kept small, and thus the sinking of the floor material 40 can be suppressed.

In the first embodiment of the double flooring 1A, as shown in FIG. 3, the height of the edge joist 30 can be easily adjusted by inserting a tool such as a screwdriver into the hole 31 from above the edge joist 30, fitting the tip of the tool into the tool insertion recess 25, and rotating the screw member 23.

Next, a comparison of the soundproofing effects of the double floor 1A of the present invention and the conventional double floor 100 will be described.
Fig. 6 is a diagram showing the intervals between the central support legs 10 and the wall-side support legs 20 in the double floor 1A of the present invention. Fig. 7 is a diagram showing the intervals between the central support legs 10 and the wall-side support legs 20 in the conventional double floor 100. Fig. 8 is a graph comparing the results of measuring the impedance level of the upper surface of the floor slab 2 when the upper surface of the floor material is vibrated in the double floor 1A of the present invention (see Fig. 7) and the conventional double floor 100 (see Fig. 8). Note that the higher the impedance level, the smaller the impact sound transmitted to the floor slab 2.
As shown in Fig. 8, when vibrations of a frequency of 63 Hz were applied to the floor material 40 as vibrations caused by walking or dropped objects, the impedance level of the double floor 1A of the present invention was about 4.5 dB higher than the impedance level of the conventional double floor 100. In other words, it was found that the double floor 1A of the present invention has a higher soundproofing effect than the conventional double floor 100.

Although the first embodiment of the present invention has been described above, the present invention is not limited to the first embodiment, and can be appropriately modified without departing from the spirit of the present invention.
As long as the spacing L3, L4 between each wall-side support leg 20 shown in FIG. 1 is greater than or equal to 1 m and less than or equal to 2 m and is greater than the spacing L1, L2 between adjacent central support legs 10, 10, the spacing L1, L2 between each central support leg 10 and the spacing L3, L4 between each wall-side support leg 20 are not limited.

As shown in FIG. 5, the edge joist 30 in the first embodiment uses a hollow member, but the shape and length of the edge joist 30 are not limited.
In addition, in the first embodiment, as shown in Figure 4, one edge joist 30 is supported by two wall side support legs 20, but the number of wall side support legs 20 supporting one edge joist 30 is not limited.

[Second embodiment]
Next, the double floor 1B of the second embodiment will be described.
As shown in FIG. 10 , the double floor 1B of the second embodiment has a configuration substantially similar to that of the double floor 1A of the first embodiment (see FIG. 5 ), but differs in that a weight member 60 is provided on the wall-side support leg 20 .
Fig. 9 is a plan view showing the wall edge support legs and edge joists of a double flooring according to a second embodiment of the present invention. As shown in Fig. 9, the weight member 60 is a member having a central hole 61 penetrating therethrough in the vertical direction. The material of the weight member 60 is not limited, and the configuration is not limited, and it may be a metal member such as lead or copper, or a bag filled with sand.
Figure 10 is a cross-sectional view of Figure 9 taken along the line X-X, showing the wall edge support legs and edge joists of a double flooring according to a second embodiment of the present invention. As shown in Figure 10, the weight member 60 is disposed inside the edge joist 30. In the second embodiment, two weight members 60, 60 are stacked one above the other. The screw member 23 is inserted into each of the central holes 61, 61 of the upper and lower weight members 60, 60.

In the double floor 1B of the second embodiment, by providing the wall-side support legs 20 with weight members 60 and adjusting the weight borne by each wall-side support leg 20, the resonant frequency of the wall-side support legs 20 can be easily adjusted.
Furthermore, by inserting the screw member 23 through the central hole 61 of the weight member 60 , the weight member 60 can be attached to the wall-side support leg 20 easily and compactly.
In addition, as shown in Figure 9, the height of the edge joist 30 can be easily adjusted by inserting a tool such as a screwdriver into the hole portion 31 and the central hole 61 of the weight member 60 from above the edge joist 30, fitting the tip of the tool into the tool insertion recess 25, and rotating the screw member 23.

The second embodiment of the present invention has been described above, but the present invention is not limited to the second embodiment, and similar to the first embodiment, it can be modified as appropriate without departing from the spirit of the invention.

1A Double bed (first embodiment)
1B Double bed (second embodiment)
2 Floor slab 2A Central region 2B Wall edge region 3 Wall body 10 Central support leg 11 Base 12 Support 20 Wall edge support leg 21 Base 22 Support 23 Screw member 24 Support member 25 Tool insertion recess 30 Edge joist 31 Hole 40 Floor material 60 Weight member 61 Central hole

Claims (4)

A plurality of central support legs erected in a central region of an upper surface of the floor slab;
A plurality of wall edge support legs erected in the wall edge region of the upper surface of the floor slab;
A steel or aluminum alloy edge joist supported by each of the wall edge support legs;
A floor material supported by the edge joists and the central support legs,
The wall support legs are:
A support extending in the vertical direction;
A support member provided at an upper end of the support column;
A screw member protruding upward from an upper end surface of the support pillar,
The support member has an axial cross section formed in a U-shape, and the edge joist is fitted into the support member .
The upper end surface of the support pillar is attached to the lower surface of the support member,
The screw member is inserted into the support member,
A tool insertion recess is formed on an upper end surface of the screw member,
The height of the support can be adjusted by rotating the screw member around an axis,
The edge joist is formed with a hole penetrating in the vertical direction,
The screw member is inserted into the hole,
The central support leg and the wall side support leg are each provided on the floor slab via an elastic member,
In each of the wall side support legs supporting one of the edge joists, the interval between adjacent wall side support legs is set to be larger than the interval between adjacent central support legs,
A double flooring structure characterized in that the distance between adjacent wall support legs is 1 m or more and 2 m or less. The double bed according to claim 1,
A double flooring structure characterized in that a weight member is provided on the wall side support leg. The double bed according to claim 2 ,
The wall-side support leg is provided with a weight member,
A double flooring system, characterized in that the screw member is inserted through the weight member. A double bed according to any one of claims 1 to 3 ,
A double flooring system characterized in that the resonance frequencies of the wall side support legs and the central support leg are set to 30 Hz or less.

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