Double bed

Abstract

To provide a double floor in which an impact sound generated on the upper surface of a floor material is hardly transmitted in both the central region and the wall side region of a floor slab.SOLUTION: A double floor 1A includes a plurality of central support legs 10 erected in a central region 2A of a floor slab 2 and a plurality of wall side support legs 20 erected in a wall side region 2B of the floor slab 2. The double floor 1A includes a steel or aluminum alloy edge joist 30 supported by each wall side support leg 20 and a floor material 40 supported by the edge joist 30 and each central support leg 10. The central support legs 10 and the wall side support legs 20 are each erected on the floor slab 2 via elastic members. The interval L3 between the wall side support legs 20 is set larger than intervals L1, L2 between the central support legs 10, and the interval L3 between the adjacent wall side support legs 20, 20 is 1 m or more and 2 m or less.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a double floor.

Background Art

[0002] In a double floor used for a building structure such as an apartment house, a floor material is supported by a plurality of support legs erected on a floor slab. Such a double floor can use the space under the floor as a piping route, and it is difficult for impact sound generated on the upper surface of the floor material due to walking or falling objects to be transmitted to the lower floor room through the floor slab.

[0003] The above-described double floor includes a plurality of edge support legs erected in the edge region of the floor slab and a plurality of central support legs erected in the central region of the floor slab, and the edge support legs and the central support legs are each erected on the floor slab via an elastic member. Further, the above-described double floor includes a wooden joist supported by each edge support leg, and the floor material is supported by the joist and each central support leg (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the above-described conventional double floor, the interval between adjacent edge support legs is set to about 0.3 m to 0.6 m, and the interval between adjacent central support legs is set to about 0.4 m to 0.6 m. In this configuration, the load area of the floor material supported by one edge support leg is significantly smaller than the load area of the floor material supported by one central support leg. Therefore, the weight borne by one edge support leg is significantly smaller than the weight borne by one central support leg.

[0006] The smaller the weight borne by the support legs supporting the flooring material, the higher the resonance frequency of the support legs. In a conventional double floor, since the weight borne by the support legs along the wall is small, there is a problem that the sound insulation effect in the area along the wall is low. In addition, when the distance between adjacent support legs along the wall is increased, although the weight borne by one support leg along the wall becomes larger, there is a problem that the deflection of the wooden joist member becomes larger and the sinking of the flooring material becomes larger.

[0007] An object of the present invention is to solve the above-described problems and provide a double floor in which impact sound generated on the upper surface of the flooring material is difficult to be transmitted both in the central region and the area along the wall of the floor slab.

Means for Solving the Problems

[0008] To solve the above problems, 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 support legs along the wall erected in the area along the wall of the upper surface of the floor slab. Further, the double floor includes a joist made of steel or aluminum alloy supported by each of the support legs along the wall, and a flooring material supported by the joist and each of the central support legs. The support leg along the wall includes a column extending in the vertical direction, and a support member provided at the upper end of the column. It includes a screw member that protrudes upward from the upper end surface of the column. The support member has a U-shaped axial cross-section, and the joist is fitted therein. , The upper end surface of the column is attached to the lower surface of the support member. The screw member is inserted through the support member, and a recess for inserting a tool is formed on the upper end surface of the screw member. By rotating the screw member around its axis, the height of the column can be adjusted. A hole that penetrates in the vertical direction is formed in the joist, and the screw member is inserted into the hole. The central support legs and the support legs along the wall are respectively erected on the floor slab via elastic members. In each of the support legs along the wall that supports one joist, the distance between adjacent support legs along the wall is set larger than the distance between adjacent central support legs, and the distance between adjacent support legs along the wall is 1 m or more and 2 m or less.

[0009] In the double floor of the present invention, since the distance between each of the support legs along the wall that supports one joist is large, the weight borne by one support leg along the wall becomes large. Along with this, since the resonance frequency of the support leg along the wall becomes low, impact sound is difficult to be transmitted to both the central region and the area along the wall of the floor slab. In addition, in the double floor of the present invention, the edge joist is formed of steel or an aluminum alloy, and the rigidity of the edge joist is high. Therefore, even if the distance between adjacent wall-side support legs is increased, the deflection of the edge joist can be suppressed to a small level, and thus the sinking of the floor material can be suppressed.

[0010] In the double floor described above, when a weight member is provided on the wall-side support leg to adjust the weight borne by one wall-side support leg, the resonance frequency of the wall-side support leg can be easily adjusted.

[0012] The double floor of the present invention Then, a tool such as a driver is inserted into the hole from above the edge joist, the tip of the tool is fitted into the tool insertion recess, and by rotating the screw member, the height of the edge joist can be easily adjusted.

[0013] In the double floor described above, when a weight member is provided on the wall-side support leg to adjust the weight borne by one wall-side support leg, the resonance 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.

[0014] In the double floor described above, it is preferable to enhance the sound insulation effect by setting the resonance frequencies of the wall-side support leg and the central support leg to 30 Hz or less.

Advantages of the Invention

[0015] In the double floor of the present invention, by lowering the resonance frequency of the wall-side support leg, impact sound is less likely to be transmitted to the floor slab in both the central region and the wall-side region of the floor slab, so that the sound insulation effect can be enhanced. Further, in the double floor of the present invention, since the edge joist is formed of steel or an aluminum alloy, even if the distance between adjacent wall-side support legs is increased, the sinking of the floor material can be suppressed.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

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Figure 8

Figure 9

Figure 10

Mode for Carrying Out the Invention

[0017] Embodiments of the present invention will be described in detail with reference to the drawings as appropriate. In the description of each embodiment, the same reference numerals are given to the same components, and duplicate descriptions are omitted.

[0018] [First Embodiment] FIG. 1 is a plan view showing a double floor according to the first embodiment of the present invention. As shown in FIG. 1, the double floor 1A of the first embodiment is used for a building structure such as an apartment house, and constitutes a floor surrounded by the wall body 3 of the room. The double floor 1A includes a plurality of central support legs 10 erected in the central region 2A on the upper surface of the floor slab 2, and a plurality of edge support legs 20 erected in the edge region 2B on the upper surface of the floor slab 2. Further, the double floor 1A includes a plurality of edge joists 30 supported by each edge support leg 20, and a floor material 40 supported by each edge joist 30 and each central support leg 10. In FIG. 1, a part of the floor material 40 is not shown.

[0019] The 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 edge region 2B.

[0020] 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 column 12 extending upward from the base. The base 11 is an elastic member such as anti-vibration rubber. As shown in FIG. 1, a plurality of central support legs 10 are arranged at intervals in the vertical and horizontal directions in FIG. 1 in the central region 2A of the floor slab 2.

[0021] FIG. 5 is a cross-sectional view taken along line V-V of FIG. 2 showing the edge 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 edge support leg 20 includes a base 21 installed in the edge region 2B of the floor slab 2, a column 22 extending upward from the base 21, a screw member 23 protruding from the upper end of the column 22, and a support member 24 provided at the upper end of the column 22. The base 21 is an elastic member such as anti-vibration rubber. The support member 24 is placed on the upper end surface of the column 22. As shown in FIG. 1, a plurality of edge support legs 20 are arranged at intervals along the inner surface of the wall 3 in the edge region 2B of the floor slab 2.

[0022] In the wall-side support leg 20 of the first embodiment, a screw member 23 projects upward from the upper surface of the support column 22. FIG. 3 is a plan view 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. 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. As shown in FIG. 5, the axial cross section is formed in a U shape. 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 through a through hole formed in the lower part of the support member 24 and projects into the support member 24. In the wall-side support leg 20 of the first embodiment, by rotating the screw member 23 about its axis, the support column 22 moves in the vertical direction with respect 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.

[0023] The edge joist 30 is a linear metal member made of steel or aluminum alloy disposed along the inner surface of the wall body 3. The edge joist 30 of the first embodiment is a member having a hollow rectangular cross section.

[0024] FIG. 4 is a side view 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. 4, the edge joist 30 is disposed at a predetermined height by having both ends supported by two wall-side support legs 20, respectively. As shown in FIG. 5, the edge joist 30 is fitted into the support member 24 of the wall-side support leg 20. A hole 31 penetrating in the vertical direction is formed in the edge joist 30. The screw member 23 is inserted into the lower part of the hole 31, and the screw member 23 projects into the edge joist 30. The upper part of the hole 31 is disposed directly above the upper end surface of the screw member 23 (see FIG. 3). Then, a tool such as a driver is inserted into the hole 31 from above the edge joist 30 shown in FIG. 3, the tip of the tool is fitted into the tool insertion recess 25, and the screw member 23 is rotated about its axis to move the support member 24 in the vertical direction, thereby adjusting the height of the edge joist 30.

[0025] In the double floor 1A of the first embodiment, five central support legs 10 are arranged at equal intervals in the horizontal direction of FIG. 1. The adjacent central support legs 10, 10 in the horizontal direction are arranged with an interval L1 therebetween. The central support leg 10 arranged at the outermost end in the horizontal direction is arranged at substantially the same interval as the interval L1 from the inner surface of the wall body 3. In the double floor 1A of the first embodiment, five central support legs 10 are arranged at equal intervals in the vertical direction of FIG. 1. The adjacent central support legs 10, 10 in the vertical direction are arranged with an interval L2 therebetween. The central support leg 10 arranged at the outermost end in the vertical direction is arranged at substantially the same interval as the interval L2 from the inner surface of the wall body 3.

[0026] In the double floor 1A of the first embodiment, two floor joists 30, 30 are linearly arranged on each surface of the wall body 3. As shown in FIG. 4, the two floor 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 body 3. Among the three wall edge support legs 20, the wall edge support leg 20 arranged in the center is arranged at the boundary portion of the two floor joists 30, 30 and supports the ends of the two floor joists 30, 30. Among the three wall edge support legs 20, the wall edge support leg 20 arranged at the end supports the end of one floor joist 30. As shown in FIG. 1, the central wall edge support leg 20 and one of the wall edge support legs 20 are arranged with an interval L3 therebetween. The central wall edge support leg 20 and the other wall edge support leg 20 are arranged with an interval L4 therebetween.

[0027] The floor material 40 is placed on the upper surfaces of the respective floor joists 30 and the upper end surfaces of the columns 12 of the respective central support legs 10. The floor material 40 is arranged at a predetermined height by being supported by the respective central support legs 10 and the respective wall edge support legs 20 (see FIGS. 2 and 5).

[0028] In the double floor 1A, as shown in FIG. 1, in each wall edge support leg 20 that supports one floor joist 30, the intervals L3, L4 between the adjacent wall edge support legs 20, 20 are set to be larger than the intervals L1, L2 between the adjacent central support legs. Specifically, the distances L3 and L4 between adjacent wall-side support legs 20, 20 are 1 m or more and 2 m or less. Note that the distances L3 and L4 between adjacent wall-side support legs 20, 20 are 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. Also, the distances L1 and L2 between adjacent central support legs 10, 10 are 0.4 m or more and 0.7 m or less.

[0029] In the double floor 1A, the distances L3 and 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 legs 20 is substantially the same as the weight of the floor material 40 borne by the central support legs 10. Furthermore, in the double floor 1A, the distances L1 and L2 between adjacent central support legs 10, 10 and the distances L3 and L4 between adjacent wall-side support legs 20, 20 are set so that the resonance frequencies of the central support legs 10 and the wall-side support legs 20 are 30 Hz or less.

[0030] In the double floor 1A as described above, as shown in FIG. 1, since the distance between each wall-side support leg 20 supporting one joist 30 is large, the weight borne by one wall-side support leg 20 increases. Accordingly, since the resonance frequency of the wall-side support leg 20 becomes low, it becomes difficult for impact sound 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 frequencies of the central support legs and the wall-side support legs to 30 Hz or less, the sound insulation effect can be enhanced. Also, in the double floor 1A of the first embodiment, the joist 30 is formed of steel or an aluminum alloy, and the rigidity of the joist 30 is high. Therefore, even if the distance between each wall-side support leg 20 supporting one joist 30 is increased, the deflection of the joist 30 can be suppressed to a small value, and thus, the sinking of the floor material 40 can be suppressed.

[0031] In the double floor 1A of the first embodiment, as shown in FIG. 3, a tool such as a driver is inserted into the hole portion 31 from above the joist 30, the tip portion of the tool is fitted into the tool insertion concave portion 25, and by rotating the screw member 23, the height of the joist 30 can be easily adjusted.

[0032] Next, the sound insulation effect comparison between 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 respective central support legs 10 and the intervals between the respective edge support legs 20 in the double floor 1A of the present invention. FIG. 7 is a diagram showing the intervals between the respective central support legs 10 and the intervals between the respective edge support legs 20 in the conventional double floor 100. And FIG. 8 is a graph comparing the results of measuring the impedance levels on 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, as the vibration generated in the floor material 40 due to walking or falling objects, when a vibration with a frequency of 63 Hz was applied to the floor material 40, 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. That is, it was found that the double floor 1A of the present invention has a higher sound insulation effect than the conventional double floor 100.

[0033] As described above, the first embodiment of the present invention has been described. However, the present invention is not limited to the first embodiment, and can be appropriately changed without departing from the gist thereof. The intervals L3 and L4 between the respective edge support legs 20 shown in FIG. 1 are 1 m or more and 2 m or less, and as long as they are larger than the intervals L1 and L2 between the adjacent central support legs 10 and 10, the intervals L1 and L2 between the respective central support legs 10 and the intervals L3 and L4 between the respective edge support legs 20 are not limited.

[0034] The joist 30 in the first embodiment uses a hollow member as shown in FIG. 5, but the shape and length of the joist 30 are not limited. Also, in the first embodiment, as shown in FIG. 4, one joist 30 is supported by two edge support legs 20, but the number of edge support legs 20 supporting one joist 30 is not limited.

[0035] [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 substantially the same configuration as the double floor 1A (see Fig. 5) of the first embodiment, except that a weight member 60 is provided on the wall-side support leg 20. Fig. 9 is a plan view showing the wall-side support leg and the edge joist of the double floor according to the second embodiment of the present invention. As shown in Fig. 9, the weight member 60 is a member having a central hole 61 penetrating in the vertical direction. The material of the weight member 60 is not limited, and it may be a metal member such as lead or copper, or a bag filled with sand, etc., and its configuration is not limited. Fig. 10 is a cross-sectional view taken along line X-X of Fig. 9 showing the wall-side support leg and the edge joist of the double floor according to the second embodiment of the present invention. As shown in Fig. 10, the weight member 60 is disposed inside the edge joist 30. In the second embodiment, two weight members 60, 60 are stacked vertically. And a screw member 23 is inserted into each of the central holes 61, 61 of the upper and lower weight members 60, 60.

[0036] In the double floor 1B of the second embodiment, by providing the weight member 60 on the wall-side support leg 20 and adjusting the weight borne by one wall-side support leg 20, the resonance frequency of the wall-side support leg 20 can be easily adjusted. Also, by inserting the screw member 23 through the central hole 61 of the weight member 60, the weight member 60 can be easily and compactly attached to the wall-side support leg 20. Further, as shown in Fig. 9, by inserting a tool such as a driver 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 height of the edge joist 30 can be easily adjusted.

[0037] Although the second embodiment of the present invention has been described above, the present invention is not limited to the second embodiment, and can be appropriately changed in the same manner as the first embodiment without departing from the gist thereof.

Explanation of reference numerals

[0038] 1A Double floor (first embodiment) 1B Double floor (second embodiment) 2 Floor slab 2A Central region 2B Peripheral region 3 Wall body 10 Central support leg 11 Base 12 Support pillar 20 Peripheral support leg 21 Base 22 Support pillar 23 Screw member 24 Support member 25 Recess for tool insertion 30 Bottom joist 31 Hole part 40 Floor material 60 Hammer member 61 Central hole

Claims

1. A plurality of central support legs erected in the central region of the upper surface of the floor slab, a plurality of edge support legs erected in the edge region of the upper surface of the floor slab, a wooden joist made of steel or aluminum alloy supported by each of the edge support legs, and a floor material supported by the wooden joist and each of the central support legs. The edge support legs include a column extending in the vertical direction, a support member provided at the upper end of the column, and a screw member protruding upward from the upper end surface of the column. The support member has a U-shaped cross-section and the wooden joist is fitted therein. The upper end surface of the column is attached to the lower surface of the support member. The screw member is inserted through the support member. A recess for inserting a tool is formed on the upper end surface of the screw member. By rotating the screw member around its axis, the height of the column can be adjusted. A hole penetrating in the vertical direction is formed in the wooden joist. The screw member is inserted into the hole. The central support legs and the edge support legs are each erected on the floor slab via an elastic member. In each of the edge support legs supporting one wooden joist, the interval between adjacent edge support legs is set larger than the interval between adjacent central support legs. A double floor characterized in that the interval between adjacent edge support legs is 1 m or more and 2 m or less.

2. The double floor according to Claim 1, characterized in that a weight member is provided on the edge support legs.

3. The double floor according to Claim 2, wherein a weight member is provided on the edge support legs, and the screw member is inserted through the weight member.

4. The double floor according to any one of Claims 1 to 3, characterized in that the resonance frequencies of the edge support legs and the central support legs are set to 30 Hz or less.

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