Anti-vibration bed structure

Abstract

To provide a vibration proof floor structure having excellent sound insulation property and load resistance.SOLUTION: In a vibration proof floor structure 100 comprising an upper story floor 50 of a building and a beam 10 supporting the floor 50, a first support member 30 comprising a spring constant K2 smaller than a spring constant K1 of the beam 10 is attached to the beam 10, a second support member 40 comprising a spring constant K3 smaller than the spring constant K1 is mounted on the first support member 30, and the second support member 40 supports the floor 50.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a vibration-isolating floor structure. [Background technology]

[0002] Floor impact noise from the upper floors of a building is transmitted to the ceiling of the lower floor via the upper floor, and is excited and radiated to the lower floor. This floor impact noise includes heavy floor impact noise and light floor impact noise.

[0003] Conventional vibration-proof floor structures are formed, for example, by attaching band-shaped vibration-proof materials or piece-shaped vibration-proof materials at intervals to the upper surface of a steel beam (H-shaped steel, channel steel, etc.), and placing a floor slab that forms the floor of the upper floor on top of the vibration-proof materials. This floor slab is a dry floor slab (dry floor), and an example of this is an ALC (Autoclaved Light Weight Concrete) floor slab (ALC panel). For example, when the floor receives a heavy floor impact sound, the elasticity of the vibration-proof materials on the steel beam reduces the frequency of the heavy floor impact sound, thereby demonstrating sound insulation performance.

[0004] Incidentally, the smaller the spring constant of the above-mentioned vibration-proof material (the softer the vibration-proof material is), the greater the effect of reducing the frequency of floor impact sound, but a small spring constant reduces the load-bearing capacity of the vibration-proof material, which creates a trade-off in that it becomes difficult to support a relatively heavy floor slab. Also, a small spring constant makes it easier for creep to progress in the vibration-proof material, which makes it difficult to achieve stable sound insulation performance over time. For these reasons, there is a demand for a vibration-proof floor structure that has excellent sound insulation performance and load-bearing capacity.

[0005] Here, a floor structure that can reduce floor impact noise and improve walking comfort has been proposed. Specifically, this is a floor structure for a building that uses a first elastic support member with a damping mechanism in combination with a second elastic support member without a damping mechanism, and elastically supports the floor material against the floor beams by interposing the first and second elastic support members between the floor beams and the floor material, and uses the damping mechanism of the first elastic support member to suppress walking vibrations in the floor material (for example, see Patent Document 1). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2006-283417 A Summary of the Invention [Problem to be solved by the invention]

[0007] In the floor structure described in Patent Document 1, a first elastic support member and a second elastic support member are disposed at different positions on the beam, and both elastic support members support the floor. One of the second elastic support members is made of anti-vibration rubber material, and the structure in which this anti-vibration rubber material supports the floor slab is no different from the conventional anti-vibration floor structure described above, and therefore, it is a floor structure that includes the above-mentioned problem.

[0008] The present invention has been made in consideration of the above problems, and aims to provide a vibration-proof floor structure that has excellent sound insulation performance and load-bearing capacity. [Means for solving the problem]

[0009] In order to achieve the above object, one aspect of the vibration-isolating floor structure according to the present invention is as follows: A vibration-proof floor structure comprising an upper floor of a building and a beam supporting the floor, A first support member having a spring constant K2 smaller than a spring constant K1 of the beam is attached to the beam, A second support member having a spring constant K3 smaller than the spring constant K1 is placed on the first support member, The second support member supports the floor.

[0010] According to this aspect, a first support member having a spring constant K2 smaller than the spring constant K1 of the beam is attached to the beam, and a second support member having a spring constant K3 similarly smaller than the spring constant K1 is placed on the first support member, i.e., the first support member and the second support member are arranged in series in the vertical direction, and the second support member supports the floor, so that the spring constant (total spring constant) of the entire support member consisting of the first support member and the second support member can be set to K4, which is smaller than K2 and K3, and it becomes possible to support the floor with a support member (unit) having a spring constant as small as possible. When the floor is supported by only one support member (vibration-proof material), there is a trade-off in that the load-bearing capacity is reduced by reducing the spring constant of the support member (vibration-proof material), whereas in this aspect, by arranging multiple support members in series in the vertical direction, the total spring constant can be reduced without making the spring constant of each support member too small, so that the decrease in the load-bearing capacity of each support member can be suppressed, and it becomes possible to form a vibration-proof floor structure that has excellent sound insulation performance and load-bearing capacity. In addition, by using multiple support members to reduce the total spring constant, the spring constant of each support member can be prevented from being made too small, which in turn suppresses the progression of creep in each support member, making it less likely that problems will arise such as the inability to achieve stable performance over time due to the progression of creep.

[0011] Here, the spring constant K1 of the beam can be set, for example, as the spring constant per unit length of the beam, and the spring constant K2 of the first support member and the spring constant K3 of the second support member can be set as the spring constants of support members whose length corresponds to the unit length of the beam or exist within the unit length.

[0012] In addition, the configuration in which a second support member is placed on a first support member and the second support member supports the floor also includes a configuration in which the second support member is further composed of a third support member and a fourth support member, the third support member is placed on the first support member, and the fourth support member is placed on the third support member, i.e., a configuration in which three support members are arranged in series in the vertical direction, and even a configuration in which four or more support members are arranged in series in the vertical direction.

[0013] Furthermore, the floor supported by the beams via the first support member and the second support member can be formed, for example, by stacking dry deck plates, soundproof mats, floor mats, etc.

[0014] In another aspect of the vibration-isolating floor structure according to the present invention, The first support member is attached to a side surface of the beam below an upper end of the beam.

[0015] According to this aspect, the first support member is attached to the side of the beam, below the upper end of the beam, so that the first support member and the second support member are arranged in series in the vertical direction, while preventing the support level of the floor by the second support member from becoming too high.

[0016] In another aspect of the vibration-isolating floor structure according to the present invention, The first support member is attached to an upper surface of the beam, and the second support member is placed at a position on the first support member below the upper end of the beam.

[0017] According to this aspect, the first support member is attached to the upper surface of the beam, and the placement position of the second support member on the first support member is lower than the upper end of the beam, so that the first support member and the second support member are arranged in series in the vertical direction, and it is possible to prevent the support level of the floor by the second support member from becoming high. For example, by making the cross-sectional shape of the first support member hat-shaped and making both side regions of the first support member slope downward compared to the central region, and placing the second support member on these sloped side regions, it is possible to arrange the placement position of the second support member on the first support member lower than the upper end of the beam.

[0018] In another aspect of the vibration-isolating floor structure according to the present invention, The second support member is disposed below an upper end of the beam, The floor is characterized in that it is provided with a receiving groove in which the upper end of the beam is received.

[0019] According to this aspect, the second support member is arranged below the upper end of the beam, and the floor is provided with an accommodation groove in which the upper end of the beam is accommodated. Therefore, the floor can be supported in a position in which the first support member and the second support member are arranged in series in the vertical direction, while the installation level of the floor can be set as low as possible.

[0020] In another aspect of the vibration-isolating floor structure according to the present invention, The beam is formed of an H-shaped steel, A mounting plate is attached to the side of the H-shaped steel, The first support member is attached to the mounting plate, the first support member extending in the longitudinal direction of the beam, The present invention is characterized in that a plurality of the second support members are placed above the first support member and are spaced apart in the longitudinal direction, or the second support member extends in the longitudinal direction.

[0021] According to this aspect, the first support member extending in the longitudinal direction of the beam is attached to the mounting plate attached to the side of the beam made of H-shaped steel, and the second support member is placed on the first support member, so that the second support member can be stably supported via the first support member firmly connected to the beam, and as a result, the floor can be stably supported by the beam via the first support member and the second support member. Here, the second support member placed on the first support member extending in the longitudinal direction of the beam may be in the form of a strip extending in the longitudinal direction of the beam like the first support member, or multiple piece-shaped members may be placed at intervals in the longitudinal direction of the first support member.

[0022] In another aspect of the vibration-isolating floor structure according to the present invention, The first support member is formed of a steel vibration-proof material having an L-shaped or U-shaped cross section, The second support member is characterized in that it is formed of a vibration-isolating material made of resin.

[0023] According to this embodiment, the first support member is formed from a steel vibration-damping material that is L-shaped or U-shaped in cross section, so that the weight of the floor can be transmitted to the beams with appropriate rigidity and elasticity, and the second support member is formed from a resin vibration-damping material, so that the effect of reducing the frequency of floor impact noise can be enhanced with the smallest possible spring constant K3.

[0024] Here, the steel vibration-proof material having an L-shaped cross section can be formed by welding two pieces of flat steel or angle steel, and the steel vibration-proof material having a U-shaped cross section can be formed by welding three pieces of flat steel or channel steel. The resin vibration-proof material is made of rubber or the like. Effect of the Invention

[0025] As can be understood from the above description, the vibration-isolating floor structure of the present invention can provide a vibration-isolating floor structure that has excellent sound insulation performance and load-bearing capacity. [Brief description of the drawings]

[0026] [Figure 1] FIG. 1 is a vertical cross-sectional view of an example of a vibration-isolating floor structure according to a first embodiment. [Diagram 2] FIG. 1 is a perspective view of a portion of an example of a vibration-isolating floor structure according to a first embodiment. [Diagram 3] FIG. 11 is a vertical cross-sectional view of an example of a vibration-isolating floor structure according to a second embodiment. [Figure 4] FIG. 11 is a vertical cross-sectional view of an example of a vibration-isolating floor structure according to a third embodiment. [Diagram 5] FIG. 11 is a vertical cross-sectional view of an example of a vibration-isolating floor structure according to a fourth embodiment. [Figure 6] FIG. 2 is a vertical cross-sectional view of a vibration-isolation floor structure according to a comparative example used in a performance evaluation experiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] Hereinafter, the vibration-isolating floor structure according to each embodiment will be described with reference to the accompanying drawings. In this specification and the drawings, substantially the same components are designated by the same reference numerals, and redundant description may be omitted.

[0028] [Vibration-proof floor structure according to the first embodiment] First, an example of a vibration-isolated floor structure according to the first embodiment will be described with reference to Figures 1 and 2. Here, Figure 1 is a vertical cross-sectional view of an example of a vibration-isolated floor structure according to the first embodiment, and Figure 2 is a perspective view of a part of an example of a vibration-isolated floor structure according to the first embodiment. Note that Figure 2 shows a state in which a floor slab 60 is placed on the second support member 40 on one side of a beam 10, and the floor slab placed on the other second support member 40 is omitted, and further, various mat materials constituting the floor 50 are omitted.

[0029] The illustrated vibration-isolated floor structure 100 has a floor 50 on an upper floor (e.g., the second or third floor) of a building, and a beam 10 that supports the floor 50. The beam 10 in the illustrated example is formed of an H-shaped steel having a web 11, an upper flange 12, and a lower flange 13.

[0030] As shown in Fig. 2, a plurality of mounting plates 20 are welded to the upper flange 12 and the lower flange 13 at intervals t1 in the longitudinal direction of the beam 10. Note that a similar plurality of mounting plates 20 are also attached to the opposite side of the H-shaped steel 10, which cannot be seen in Fig. 2.

[0031] A first support member 30 made of angle iron is joined to the multiple mounting plates 20 via bolts 25. Here, the first support member 30 is also a band-shaped member extending along the longitudinal direction of the beam 10, and multiple reinforcing ribs 31 are welded to it at intervals t2 in the longitudinal direction. The first support member may be made of other types of shaped steel material such as channel steel, in addition to angle iron. The first support member may be in the form of a piece extending in the longitudinal direction, in addition to the band-shaped form extending in the longitudinal direction as in the illustrated example.

[0032] As shown in Figures 1 and 2, the first support member 30 is bolted to multiple mounting plates 20 with the upper end 30a of the first support member 30 positioned below the upper end 12a of the upper flange 12 of the beam 10.

[0033] A belt-shaped second support member 40 extending in the longitudinal direction is placed on the upper end 30a of each of the first support members 30 on both sides of the beam 10, similar to the beam 10 and the first support member 30. The second support member 40 is formed of a viscoelastic material such as rubber or urethane foam. For example, the second support member 40 is fixed to the upper end 30a of the first support member 30 via an adhesive. Note that, similar to the first support member, the second support member may be in the form of a plurality of pieces other than the belt-shaped form extending in the longitudinal direction as in the illustrated example.

[0034] The first support member 30 is a vibration-proof material having a spring constant K2 per unit width when the interval t2 between the reinforcing ribs 31 is taken as a unit width in the longitudinal direction, and the spring constant K2 is a spring constant that is significantly smaller than the spring constant K1 per unit width of the beam 10 (K2 <K1)。

[0035] On the other hand, the second support member 40 is a vibration-proof material having a spring constant K3 per unit width which is smaller than the spring constant K2 of the first support member 30 as well as the spring constant K1 of the beam 10 (K3 <K2)。

[0036] 1 and 2, a first support member 30 connected to the beam 10 via a mounting plate 20 and a second support member 40 placed above the first support member 30 are arranged in series in the vertical direction on both sides of the beam 10. A floor 50 is supported on the first support member 30 and the second support member 40 which are in a series relationship with each other.

[0037] The floor 50 has a plurality of dry slabs 60 and a floor mat 70 laid on the plurality of slabs 60 laid horizontally. The slabs 60 may be made of the ALC slab or precast concrete slab (PCa slab, PCa panel) described above.

[0038] The floor mat 70 in the illustrated example is formed by laminating double soundproof mats 71 and 72, a particle board 73, and a floor mat 74.

[0039] As shown in Figure 1, in the illustrated example vibration-proof floor structure 100, an adjacent deck 60 is arranged directly above the upper flange 12 of the beam 10 with a gap 60a of a certain width, and in this gap 60a, a cushioning material 81 is placed on the upper end 12a of the upper flange 12, a deck block 82 is placed on top of the cushioning material 81, and a separate cushioning material 83 is arranged around the deck block 82.

[0040] It is generally known from equation expansion using Hooke's law that the total spring constant of the first support member 30 and the second support member 40 is small when the first support member 30 with spring constant K2 and the second support member 40 with spring constant K3 are arranged in series in the vertical direction. That is, the total spring constant K4 in the case of the series arrangement of the first support member 30 with spring constant K2 and the second support member 40 with spring constant K3 can be expressed as 1 / K4=1 / K2+1 / K3, and it can be seen that K4 is smaller than K2 and K3.

[0041] In this way, the first support member 30 and the second support member 40 are arranged in series in the vertical direction, and the second support member 40 supports the floor 50. As a result, the spring constant (total spring constant) of the entire support member consisting of the first support member 30 and the second support member 40 can be set to a spring constant K4 that is smaller than the spring constants K2 and K3 of each support member 30, 40, making it possible to support the floor 50 with a support member (unit) having the smallest possible spring constant.

[0042] That is, when the floor 50 is supported by only one support member (vibration-proof material), there is a trade-off in that making the spring constant of the support member (vibration-proof material) small (too small) results in a reduced load-bearing capacity, but by arranging multiple support members 30, 40 (two in the illustrated example) in series in the vertical direction, the total spring constant can be reduced without making the spring constants K2, K3 of each support member 30, 40 too small, thereby suppressing a decrease in the load-bearing capacity of each support member 30, 40. This makes it possible to form a vibration-proof floor structure 100 that has excellent sound insulation performance and load-bearing capacity.

[0043] In addition, since the first support member 30 is a vibration-proof material formed from steel angle iron, it has appropriate rigidity and elasticity and can transmit the weight of the floor 50 to the beam 10. On the other hand, since the second support member 40 is a vibration-proof material made of resin, it is possible to increase the effect of reducing the frequency of floor impact sound with the smallest possible spring constant K3.

[0044] In addition, by reducing the total spring constant by using multiple support members 30, 40, the spring constants K2, K3 of each support member 30, 40 can be prevented from being made too small, thereby suppressing the progression of creep in each support member 30, 40 and reducing the likelihood of problems such as the inability to perform stably over time due to the progression of creep.

[0045] Furthermore, when using a vibration-proofing material made of rubber or the like alone, vibration-proofing materials made of rubber with uncommon compositions may be used to improve the sound insulation performance, and in such cases the rising material costs of the vibration-proofing material can become a major problem.In contrast, in the vibration-proof floor structure 100, the total spring constant can be reduced by using multiple support members 30, 40, so a general-purpose product (general rubber, etc.) can be used for the second support member 40, preventing increases in material costs.

[0046] Furthermore, since the first support member 30 is attached to the side of the beam 10 below the upper end 12a of the upper flange 12 of the beam 10, the first support member 30 and the second support member 40 are arranged in series in the vertical direction, the support level of the floor by the second support member 40 can be prevented from becoming too high.

[0047] [Anti-vibration floor structure according to the second embodiment] Next, an example of a vibration-isolating floor structure according to a second embodiment will be described with reference to Fig. 3. Here, Fig. 3 is a vertical cross-sectional view of an example of a vibration-isolating floor structure according to the second embodiment.

[0048] The vibration-proof floor structure 100A shown in the figure has a first support member 30A formed of a compression spring, a disc spring, or the like placed on the upper end 12a of the upper flange 12 of the beam 10, a second support member 40A formed of rubber or the like placed on the first support member 30A, and a floor 50 placed on the second support member 40A.

[0049] The vibration-isolation floor structure 100A not only achieves various effects similar to those of the vibration-isolation floor structure 100 shown in Figures 1 and 2, but also eliminates the need for mounting plates 20, etc., thereby making it possible to further reduce construction costs.

[0050] [Vibration-proof floor structure according to the third embodiment] Next, an example of a vibration-isolating floor structure according to a third embodiment will be described with reference to Fig. 4. Here, Fig. 4 is a vertical cross-sectional view of an example of a vibration-isolating floor structure according to the third embodiment.

[0051] In the illustrated vibration-isolated floor structure 100B, a first support member 30B made of steel and having a hat-shaped cross section is placed on the upper end 12a of the upper flange 12 of the beam 10. More specifically, a central region 30b of an upper protrusion of the hat shape is placed on the upper end 12a of the upper flange 12. Then, a second support member 40 is placed on the side regions 30c on both sides of the lower protrusion of the hat shape.

[0052] According to the vibration-isolated floor structure 100B, like the vibration-isolated floor structure 100, the first support member 30B and the second support member 40 are arranged in series in the vertical direction, but the placement level of the second support member 40 can be set below the upper end 12a of the upper flange 12 of the beam 10, preventing the support level of the floor from being high due to the second support member 40. Furthermore, like the vibration-isolated floor structure 100A, the mounting plate 20 and the like are not required, which enhances the effect of reducing construction costs.

[0053] [Vibration-proof floor structure according to the fourth embodiment] Next, an example of a vibration-isolating floor structure according to a fourth embodiment will be described with reference to Fig. 5. Here, Fig. 5 is a vertical cross-sectional view of an example of a vibration-isolating floor structure according to the fourth embodiment.

[0054] The illustrated vibration-isolation floor structure 100C is similar to the vibration-isolation floor structure 100 shown in Figures 1 and 2 in that a first support member 30 formed of angle iron is attached to a mounting plate 20 attached to a beam 10, and a second support member 40 is placed on the first support member 30. However, compared to the vibration-isolation floor structure 100, the first support member 30 is attached at a lower position of the mounting plate 20, and the upper end 40a of the second support member 40 is positioned lower than the upper end 12a of the upper flange 12 of the beam 10.

[0055] The floor slab 60A forming the floor 50A is provided with an accommodation groove 61 in which the upper end of the beam 10 is accommodated, and by accommodating the upper end of the beam 10 in the accommodation groove 61, it is possible to place the underside 62 of the floor slab 60A against the upper end 40a of the second support member 40, which is positioned below the beam 10.

[0056] According to the vibration-proof floor structure 100C, in addition to providing various effects similar to those of the vibration-proof floor structure 100, it is possible to set the installation level of the floor 50A as low as possible while supporting the floor in a position in which the first support member 30 and the second support member 40 are arranged in series in the vertical direction.

[0057] [Performance evaluation experiment] The inventors conducted an experiment to evaluate the performance of the vibration-isolated floor structure 100 according to the first embodiment. In this experiment, the vibration-isolated floor structure 100 was used as an example, and the conventional vibration-isolated floor structure shown in FIG. 6 was used as a comparative example. The vibration-isolated floor structure shown in FIG. 6 is a conventional general vibration-isolated floor structure that includes a beam B formed of an H-shaped steel, and a vibration-isolated material V made of the same material as the second support member 40 (rubber) of the vibration-isolated floor structure 100 is placed on the upper end of the upper flange B1 of the beam B, and the floor F is supported in the vertical direction by a single vibration-isolated material V. The floor F, like the floor 50 of the vibration-isolated floor structure 100, has a floor slab S and a floor mat M in which four layers of various mats M1, M2, M3, and M4 are laminated.

[0058] Heavy floor impact sounds were generated on the floor surfaces of the floors that make up each of the vibration-isolation floor structures of the examples and comparative examples, and the impact sound levels were measured in each frequency range. Here, the heavy floor impact sounds were simulated sounds such as jumping on the floor and walking sounds. The experimental results are shown in Table 1 below.

[0059] [Table 1]

[0060] As can be seen from Table 1, at 63 Hz, which is within the audible range of heavy floor impact noise frequencies, the embodiment is able to reduce the frequency by 2.5 dB compared to the comparative example, demonstrating improved sound insulation performance (moving it away from the audible range).

[0061] In addition, the present invention is not limited to the configuration shown here, and may be implemented in other embodiments in which other components are combined with the configurations and the like of the above-mentioned embodiment. In this regard, the present invention may be modified within the scope of the gist of the present invention, and may be appropriately determined according to the application form. [Explanation of symbols]

[0062] 10: Beam (H-shaped steel) 11: Web 12: Upper flange 12a:Top edge 13: Lower flange 20: Mounting plate 25: Bolt 30, 30A, 30B: First support member (support member) 30a: Upper end 30b: Central area 30c: Lateral area 31: Reinforcement rib 40, 40A: Second support member (support member) 40a: Upper end 50,50A:Floor 60,60A: Floor slab 60a: Gap 61: Storage groove 62: Bottom surface 70:Floor mat 71, 72: Soundproof mat 73: Particle board 74: Floor mat 81: Cushioning material 82: Deck block 83: Cushioning material 100, 100A, 100B, 100C: Anti-vibration floor structure

Claims

1. A vibration-proof floor structure comprising an upper floor of a building and a beam supporting the floor, A first support member having a spring constant K2 smaller than the spring constant K1 of the beam is attached to an upper surface of the beam, A second support member having a spring constant K3 smaller than the spring constant K1 is placed on the first support member, the second support member supports the floor; A vibration-isolation floor structure, characterized in that the second support member is placed on the first support member at a position lower than the upper end of the beam.

2. The second support member is disposed below an upper end of the beam, 2. The vibration-isolating floor structure according to claim 1, wherein the floor is provided with a receiving groove for receiving the upper end of the beam.

3. The beam is formed of H-shaped steel, The first support member is a steel vibration-proof material having a hat-shaped cross section, The second support member is a vibration-proof material made of resin, The vibration-isolation floor structure described in claim 1 or 2, characterized in that the central region of the hat-shaped upper protrusion of the first support member is placed on the upper end of the upper flange of the H-shaped steel, and the second support member is placed on the lateral regions on both sides of the hat-shaped lower protrusion.

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