Damping enrichment member of support leg, and damping enrichment support leg

Abstract

To provide a damping enrichment member of a support leg that can damp downward and upward vibrations acting on a floor material alone and also supports the floor material on a constituent member at normal time when no impact is received, and is free of a load other than a downward load, and a damping enrichment support leg.SOLUTION: A damping reinforcement member 50 has a restricting fixed member 20 and a second vibration-proof rubber 30. The restricting fixed member 20 has a horizontal support member 22 which has a first hollow hole 22a through which a column part 14 of a support leg 10 penetrates, and is positioned horizontally at a predetermined support height h from a slab top surface 2a. The second vibration-proof rubber 30 has a second hollow hole 30a through which the column part penetrates, and is positioned between the horizontal support part 22 and a first vibration-proof rubber 18 or an upper end face of a diameter expansion part 15 to elastically bear upward displacement of the diameter expansion part 15.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a damping reinforcement member for a support leg and a damping reinforcement support leg that reduce vibrations in a double floor consisting of a floor slab and a floor material positioned horizontally above the floor slab. [Background technology]

[0002] As a floor finishing technique for reinforced concrete apartment buildings, dry double floors using vibration-proof support legs have traditionally been popular to support the floor material by maintaining the gap between the floor slab and the floor material of double floors consisting of a floor slab and a floor material positioned horizontally above it. By using vibration-isolating rubber, these support legs can significantly improve the impact sound insulation performance of lightweight floors compared to bare slabs.Furthermore, the floor height can be easily adjusted during construction, allowing for efficient construction of double floors. However, even when vibration-isolating support legs are used, the heavy floor impact sound insulation performance of double floors tends to deteriorate compared to when the slab is bare due to the resonance phenomenon of the air layer under the floor. In order to solve this problem, the means disclosed in Patent Documents 1 and 2, for example, have been proposed.

[0003] The "double floor structure" of Patent Document 1 is a double floor structure in which multiple underfloor materials are supported at a predetermined height level by a group of support legs that are erected via elastic bases on a floor base such as a concrete floor slab. This double floor structure has fastening panels placed in contact with the underfloor materials, vibration-damping materials placed in contact with the fastening panels, and floor finishing materials laid on the vibration-damping materials. The fastening panels are made of wood fiberboards with a thickness of 4 to 6 mm and a specific gravity of 0.8 to 1.2. The vibration-damping materials are flexible, with a thickness of 3 to 5 mm and a specific gravity of 2.0 to 2.5. The floor finishing materials are 3 to 6 mm thick.

[0004] The "double floor vibration isolation structure and floor vibration isolation member" of Patent Document 2 is a double floor structure in which floor material is supported at a predetermined height from the foundation surface by multiple floor support legs, and cushioning materials are provided at the lower ends of the floor support legs, and a floor vibration isolation member is also provided. This floor vibration isolation member connects the foundation surface and the floor material, and interposes an elastic vibration isolation body with adjustable tension, and applies the tension of this vibration isolation body between the foundation surface and the floor material, thereby isolating upward vibration of the floor material due to floor impact. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-270372 [Patent Document 2] Japanese Patent Application Laid-Open No. 2003-321930 Summary of the Invention [Problem to be solved by the invention]

[0006] The conventional vibration-isolating support legs described above have the effect of suppressing downward vibrations of floor materials by using vibration-isolating rubber at their lower ends, but they cannot be expected to have the effect of suppressing upward vibrations of floor materials.

[0007] Patent Document 1 discloses a configuration in which a vibration-damping material made of a mixture of asphalt-based resins, etc., is included in the base material of a double floor. In this case, the use of a relatively heavy vibration-damping material has the effect of suppressing vibrations acting on the supporting legs due to the weight of the floor itself, thereby increasing the sound-deadening effect. However, using vibration-damping materials not only increases costs, but also makes the installation of relatively heavy vibration-damping materials difficult.

[0008] Patent Document 2 discloses a configuration in which vibration-isolating members (vibration dampers) made of rubber or the like are provided separately from the support legs of the double floor. In this case, the vibration-isolating members (vibration dampers) absorb the vibrations acting on the support legs in the tensile direction, which is expected to have the effect of suppressing vibrations in the tensile direction and also increase the sound-deadening effect.

[0009] However, the structure of Patent Document 2 has the following problems. (1) It is necessary to use both floor support legs with cushioning material at the bottom and floor vibration isolation members that apply tension between the foundation surface and the floor material. Therefore, compared to installing only floor support legs, it becomes necessary to install extra floor vibration isolation members, which increases costs and significantly worsens overall workability.

[0010] (2) Furthermore, since a vibration isolator with elasticity that allows for adjustable tension is placed between the foundation surface and the floor material, the downward load caused by the tension of the vibration isolator is applied to the cushioning material of the floor support legs in addition to the downward load that supports the floor material. As a result, a large load is always applied to the cushioning material of the floor support legs, which results in the cushioning material becoming larger or having a shorter lifespan.

[0011] The present invention has been devised to solve the above-mentioned problems. That is, an object of the present invention is to provide a damping reinforcement member for a support leg and a damping reinforcement support leg that can independently attenuate downward and upward vibrations acting on a floor material, and that does not receive loads other than the downward load supporting the floor material on the structural members under normal conditions when no impact is received. [Means for solving the problem]

[0012] According to the present invention, there is provided a damping reinforcement member for a support leg supporting a double floor consisting of a floor slab and a floor material positioned horizontally above the floor slab, The support legs are A flooring support plate fixed to the underside of the flooring and having an internal thread portion centered on a vertical axis; a support bolt having a cylindrical portion that has an external thread portion on its upper outer peripheral surface that threads into the internal thread portion and that extends vertically downward in an in-use state, and an expanded diameter portion that is fixed to a lower end of the cylindrical portion in an in-use state; A first vibration-isolating rubber whose lower end surface is located on the upper surface of the floor slab and elastically supports the downward displacement of the enlarged diameter portion, The damping reinforcement member is a restraining and fixing member having a horizontal support portion that has a first hollow hole through which the cylindrical portion passes and is positioned horizontally at a predetermined support height from the upper surface of the slab; A damping reinforcement member for a support leg is provided, which has a second hollow hole through which the cylindrical portion passes, and a second vibration-damping rubber which is positioned between the horizontal support portion and the first vibration-damping rubber or the upper end surface of the enlarged diameter portion, and which elastically supports the upward displacement of the enlarged diameter portion.

[0013] According to the present invention, there is also provided a damping reinforcement support leg for supporting a double floor consisting of a floor slab and a floor material positioned horizontally above the floor slab, A flooring support plate fixed to the underside of the flooring and having an internal thread portion centered on a vertical axis; a support bolt having a cylindrical portion that has an external thread portion on its upper outer peripheral surface that threads into the internal thread portion and that extends vertically downward in an in-use state, and an expanded diameter portion that is fixed to a lower end of the cylindrical portion in an in-use state; a first vibration-isolating rubber whose lower end surface is located on the upper surface of the floor slab and which elastically supports downward displacement of the enlarged diameter portion; a damping reinforcement member fixed to the upper surface of the slab and elastically supporting the upward displacement of the enlarged diameter portion, The damping reinforcement member is a restraining and fixing member having a horizontal support portion that has a first hollow hole through which the cylindrical portion passes and is positioned horizontally at a predetermined support height from the upper surface of the slab; A damping-enhanced support leg is provided, which has a second hollow hole through which the cylindrical portion passes, and a second vibration-damping rubber which is positioned between the horizontal support portion and the first vibration-damping rubber or the upper end surface of the enlarged diameter portion, and which elastically supports the upward displacement of the enlarged diameter portion. [Effects of the Invention]

[0014] According to the above-described configuration of the present invention, in use, the support bolt, which has a male thread that screws into a female thread of a floor support plate fixed to the underside of the floor material, extends vertically downward. Also, the lower end surface of the first vibration-isolating rubber is positioned on the upper surface of the floor slab, elastically supporting the downward displacement of the enlarged diameter portion of the support bolt. Therefore, by screwing the male threaded portion of the support bolt into the female threaded portion of the floor material support plate fixed to the underside of the floor material and rotating the support bolt around the vertical axis, the distance between the floor slab and the floor material can be adjusted to support the floor material.

[0015] Furthermore, when the support bolts support the floor material while maintaining the gap between the floor slab and the floor material, only compressive stress due to the downward load supporting the floor material acts on the cylindrical portion of the support bolt.

[0016] In addition, the first vibration-damping rubber elastically supports the downward displacement of the expanded diameter portion, the horizontal support portion of the restraining fixing member is positioned horizontally at a predetermined support height from the top surface of the slab, and the second vibration-damping rubber is positioned between the horizontal support portion and the upper end surface of the first vibration-damping rubber or the expanded diameter portion, and elastically supports the upward displacement of the expanded diameter portion. Therefore, the downward and upward displacement of the enlarged diameter section caused by the up and down vibration of the floor material due to impact is elastically supported by the first and second vibration-damping rubbers, absorbing the vibration energy, so that downward and upward vibrations can be damped independently. [Brief explanation of the drawings]

[0017] [Figure 1] This shows the results of a simulation of the vibration reduction effect of conventional and improved support legs. [Figure 2] 1 is a diagram showing the overall configuration of a double floor to which the damping reinforcement member of the present invention is applied and the support legs that support it. [Figure 3] FIG. 2 is a diagram illustrating a first embodiment of a damping reinforcement member. [Figure 4] FIG. 10 is a view showing a second embodiment of a damping reinforcing member. [Figure 5] FIG. 10 is a view showing a third embodiment of a damping reinforcement member. [Figure 6] FIG. 10 is a view showing a fourth embodiment of a damping reinforcement member. [Figure 7] FIG. 10 is a diagram illustrating a fifth embodiment of a damping reinforcement member. [Figure 8] 1 is a diagram showing the overall configuration of a damping reinforcement support leg according to the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0018] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. In addition, common parts in the drawings are given the same reference numerals, and duplicated explanations will be omitted.

[0019] Figure 1 shows the simulation results of the vibration reduction effect of conventional and improved support legs. As described above, the "conventional support leg" has the effect of suppressing downward vibrations of the floor material by the vibration-isolating rubber at its lower end, but does not have the effect of suppressing upward vibrations of the floor material. In addition, "improved support legs" refer to support legs that have the effect of suppressing downward vibrations of floor materials by using vibration-damping rubber at the lower end, just like conventional support legs, and also have the effect of suppressing upward vibrations of floor materials.

[0020] In Figure 1, the horizontal axis is vibration frequency (Hz) and the vertical axis is the reduction in vibration acceleration level of the slab (dB). The solid line in the figure shows conventional support legs with vibration isolation, and the dashed line shows the improved support legs. The reduction in vibration acceleration level (dB) on the vertical axis is based on the vibration acceleration level of the floor slab alone, and is an index that roughly corresponds to the reduction in floor impact sound level. The impact source is the standard heavy impact noise (tire) based on JIS A 1418-2.

[0021] In addition, in this simulation, the elastic coefficient of the second vibration-damping rubber 30 (described later) for upward displacement (hereinafter referred to as the "second elastic coefficient K2") is set to be the same as the elastic coefficient of the first vibration-damping rubber 18 for downward displacement (hereinafter referred to as the "first elastic coefficient K1").

[0022] In Figure 1, the reduction in vibration acceleration levels for conventional support legs (solid lines) are all negative, and it can be seen that the heavy floor impact sound insulation performance of double floors tends to deteriorate compared to the floor slab alone, even when conventional vibration-isolating support legs are used, due to resonance phenomena in the underfloor air layer, etc. Normally, conventional support legs for double floors are designed so that when the floor sinks, the compression spring acts strongly, but when it rises, the tension spring is less likely to act. Therefore, while conventional support legs have the effect of reducing downward vibrations of the floor material through the vibration-damping rubber at their bottom ends, they cannot be expected to have the effect of reducing upward vibrations of the floor material.

[0023] On the other hand, in Figure 1, the reduction in vibration acceleration level of the improved support leg (dashed line) is significantly improved in the frequency range above 31.5 Hz compared to the conventional vibration-isolating support leg (solid line). In particular, it was found that an improvement of approximately 5 dB could be achieved even at 63 Hz, which is important for the heavy floor impact sound insulation performance of double floors.

[0024] The damping reinforcement member for a support leg and the damping reinforcement support leg according to the present invention are intended to provide the improved support leg described above. In FIG. 1, the second elastic coefficient K2 for the upward displacement of the second vibration-damping rubber 30 described later is set to be the same as the first elastic coefficient K1 for the downward displacement of the first vibration-damping rubber 18, but the present invention is not limited to this and it is sufficient that they are substantially the same. That is, it is preferable that K2≒K1, but it is sufficient if the elastic coefficient ratio K2 / K1 is 0.5 or more and 1.5 or less. Furthermore, it is desirable that the linear elastic range X2 of the second vibration-isolating rubber 30 and the linear elastic range X1 of the first vibration-isolating rubber 18 are larger than the maximum amplitude of the double floor 1 (particularly the floor material 4). The maximum amplitude of the floor material 4 is, for example, ±5 mm.

[0025] FIG. 2 is a diagram showing the overall configuration of a double floor 1 to which the damping reinforcement member 50 of the present invention is applied and the support legs 10 that support the double floor 1. In this figure, a double floor 1 consists of a floor slab 2 and a floor material 4 positioned horizontally above it. The floor slab 2 is, for example, a concrete structural floor or a wooden floor. Although only one support leg 10 is shown in this figure, a plurality of support legs are usually arranged in a dispersed manner on the floor slab 2 . The floor material 4 is supported by a plurality of support legs 10 and extends horizontally.

[0026] In this example, the flooring material 4 has a base material 5 formed horizontally on support legs 10, a subfloor material 6 formed on the base material 5, and a floor finishing material 7 formed on the subfloor material 6. The substrate 5 is, for example, particle board, structural plywood, etc. The thickness of the substrate 5 is, for example, 20 mm. The base material 6 is, for example, particle board, structural plywood, gypsum board, etc. The base material 6 may be omitted or may be configured to have multiple layers. The floor finishing material 7 is, for example, a wooden floor material, a carpet, or the like.

[0027] In this example, an opening or gap is provided in the floor material 4 (base material 5 in this example) directly above the support leg 10. Hereinafter, this opening or gap will be simply referred to as "opening 8."

[0028] In FIG. 2, the support leg 10 includes a floor support plate 12 , a support bolt 16 , and a first vibration-isolating rubber 18 .

[0029] The flooring support plate 12 is fixed to the underside of the flooring 4 (in this example, the base material 5) and has a female thread portion 11a centered on the vertical axis Z. In this example, a nut member 11 having a female thread portion 11a is fixed to the underside of the flooring support plate 12. Note that the shape of the nut member 11 is not limited to this example and may be any other shape. The means for fixing the flooring support plate 12 and the nut member 11 is, for example, nails, screws, or adhesive.

[0030] The support bolt 16 has a cylindrical portion 14 having a vertical axis Z and positioned vertically when in use, and an expanded diameter portion 15 fixed to the lower end of the cylindrical portion 14 when in use. The cylindrical portion 14 has an externally threaded portion 13 on its upper outer peripheral surface that screws into the internally threaded portion 11a of the nut member 11. The externally threaded portion 13 may be provided over the entire cylindrical portion 14. Furthermore, the support bolt 16 has a torque transmission portion 17 for rotating the cylindrical portion 14 around the vertical axis Z. In this example, the torque transmission portion 17 is a groove (or a protrusion) provided at the upper end of the cylindrical portion 14. The torque transmission portion 17 is provided so that the torque transmission portion 17 can be rotated around the vertical axis Z with a screwdriver or the like through an opening 8 in the flooring material 4 (in this example, the base material 5).

[0031] When in use, the lower end surface of the first vibration-isolating rubber 18 is located on the slab upper surface 2a of the floor slab 2. In addition, in this example, the expanded diameter portion 15 is fitted into the upper recess of the first vibration-isolating rubber 18. With this configuration, the first vibration-isolating rubber 18 elastically supports the downward displacement of the expanded diameter portion 15. In this example, the first vibration-isolating rubber 18 holds the enlarged diameter portion 15 so that it can rotate about the vertical axis Z.

[0032] With the above-described configuration of the support leg 10, the floor material 4 can be positioned above the floor slab 2 by screwing the male threaded portion 13 at the top of the cylindrical portion into the female threaded portion 11a of the floor material support plate 12 fixed to the underside of the floor material and positioning the support bolt 16 vertically. In this state, the distance between the floor slab 2 and the floor material 4 (for example, the floor surface height H from the slab top surface 2a to the top surface of the base material 5) can be adjusted by rotating the torque transmission part 17 (for example, a + groove or a - groove) around the vertical axis Z using a screwdriver or the like through the opening 8.

[0033] In FIG. 2, the damping reinforcement member 50 is fixed to the slab upper surface 2 a and has the function of elastically supporting the upward displacement of the enlarged diameter portion 15 .

[0034] FIG. 3 is a diagram showing a first embodiment of the damping reinforcement member 50. As shown in FIG. In this figure, (A) is a side view of the lower end portion of the support leg 10 in Figure 2, and (B) is a top view of (A). Note that in Figure 3(B), the cross section of the columnar portion 14 is omitted.

[0035] In FIG. 3, the damping reinforcement member 50 includes a restraining and fixing member 20 and a second vibration-isolating rubber member 30 . The restraining and fixing member 20 also has a horizontal support portion 22 and an outer fixing portion 24. The restraining and fixing member 20 is preferably a one-piece member made of metal or plastic.

[0036] The horizontal support portion 22 has a first hollow hole 22a through which the cylindrical portion 14 of the support bolt 16 passes, and extends horizontally when in use. The first hollow hole 22a is set to be larger than the outer diameter of the cylindrical portion 14, allowing the cylindrical portion 14 to rotate freely around the vertical axis Z. In addition, the outer edge of the horizontal support portion 22 is set to be larger than the planar dimensions of the first vibration-damping rubber 18 and the second vibration-damping rubber 30.

[0037] The outer fixing portion 24 has an outer edge plate 25 positioned horizontally close to the slab upper surface 2a, and multiple (four in this example) connecting plates 26 that connect the outer edge plate 25 and the horizontal support portion 22 vertically or at an angle. The lower end of the outer fixing portion 24 (in this example, the outer edge plate 25) is fixed to the slab upper surface 2a. This fixing means is preferably nailed, but may also be adhesive or the like.

[0038] The above-described configuration of the restraining and fixing member 20 allows the first vibration-isolating rubber 18 to be positioned below the horizontal support portion 22 and inside the outer fixing portion 24 .

[0039] In FIG. 3(A), the expanded diameter portion 15 is a rotating body having a larger diameter than the cylindrical portion 14 and centered on the vertical axis Z, and is fixed integrally to the lower end of the cylindrical portion 14. The first vibration-isolating rubber 18 has an upper support surface 18a that is positioned close to or in close contact with the lower surface of the enlarged diameter portion 15 and that supports the enlarged diameter portion 15 so that it can rotate about the vertical axis Z.

[0040] The second vibration-damping rubber 30 has a second hollow hole 30a through which the cylindrical portion 14 of the support bolt 16 passes vertically when in use, and is located between the lower surface of the horizontal support portion 22 and the upper surface of the first vibration-damping rubber 18. The second hollow hole 30a is set to be larger than the outer diameter of the cylindrical portion 14, allowing the cylindrical portion 14 to rotate freely around the vertical axis Z. In addition, the upper surface of the second vibration-damping rubber 30 is a flat surface that closely contacts the lower surface of the horizontal support portion 22, and the shape of its lower surface is set to closely contact the upper surface of the first vibration-damping rubber 18 and prevent the expanded diameter portion 15 from coming off the first vibration-damping rubber 18.

[0041] In addition, the second vibration-damping rubber 30 is located close to or in close contact with the upper surface of the first vibration-damping rubber 18 or the enlarged diameter portion 15, and has a lower support surface 30b that enables rotation of the enlarged diameter portion 15 around the vertical axis Z. The second vibration-isolating rubber 30 is a body of revolution centered on the vertical axis Z, and is preferably a truncated cone or cylinder whose outer surface shape changes gradually from the upper surface of the first vibration-isolating rubber 18 to the lower surface of the horizontal support portion 22. The first vibration-isolating rubber 18 and the second vibration-isolating rubber 30 are preferably made of the same elastic rubber, but may be made of different elastic materials.

[0042] The above-described configuration of the damping reinforcement member 50 allows the cylindrical portion 14 and the enlarged diameter portion 15 of the support bolt 16 to rotate freely around the vertical axis Z, and the downward and upward displacement of the enlarged diameter portion 15 can be elastically supported by the first vibration-isolating rubber 18 and the second vibration-isolating rubber 30.

[0043] The second elastic coefficient K2 of the second vibration-proof rubber 30 with respect to upward displacement is preferably set to be the same as the first elastic coefficient K1 with respect to downward displacement of the first vibration-proof rubber 18. However, the present invention is not limited to this, and it is sufficient if they are substantially the same. That is, as mentioned above, the elastic coefficient ratio K2 / K1 should be 0.5 or more and 1.5 or less. Furthermore, it is desirable that the linear elastic range X2 of the second vibration-isolating rubber and the linear elastic range X1 of the first vibration-isolating rubber are larger than the maximum amplitude of the double floor 1 (particularly the floor material 4). The maximum amplitude of the floor material 4 is, for example, ±5 mm.

[0044] The support height h from the slab upper surface 2a to the lower surface of the horizontal support portion 22 is set to a predetermined value in advance. The support height h of the restraining fixing member 20 is preferably set to the sum (total height) of the heights of the first vibration-isolating rubber 18 and the second vibration-isolating rubber 30 under normal conditions when the floor material 4 is not subjected to impact. In this state, the first vibration-isolating rubber 18 is compressed downward by the downward load supporting the floor material 4. On the other hand, the second vibration-isolating rubber 30 is not subjected to either a downward or upward load, and is preferably in a compressed state with no load or close to no load, to the extent that no gap is created between the horizontal support part 22 and the upper end surface of the first vibration-isolating rubber 18.

[0045] The configuration of the damping reinforcement member 50 of the first embodiment described above allows the first vibration-damping rubber 18 and the second vibration-damping rubber 30 to be positioned below the horizontal support portion 22 and inside the outer fixed portion 24, and the second vibration-damping rubber 30 can elastically support the upward displacement of the enlarged diameter portion 15. Furthermore, when the support leg 10 is an existing product, the damping reinforcement member 50 can be retrofitted to the existing product. Furthermore, the height of the floor material 4 can be adjusted in the same way as before, so the downward and upward vibrations acting on the floor material 4 can be damped independently without hindering the workability of the conventional double floor construction method.

[0046] FIG. 4 is a diagram showing a second embodiment of the damping reinforcement member 50. As shown in FIG. In this figure, (A) is a side view of the lower end portion of the support leg 10 in Figure 2, and (B) is a top view of (A). Note that in Figure 4(B), the cross section of the columnar portion 14 is omitted.

[0047] In FIG. 4(A), the support bolt 16 (the cylindrical portion 14 and the expanded diameter portion 15) has a hollow through-hole 14a that passes vertically along its axis. The first vibration-proof rubber 18 also has a hollow through hole 19a that passes vertically along an axis that coincides with the hollow through hole 14a, and a recessed groove 19b that is provided in the bottom surface and communicates with the hollow through hole 19a.

[0048] With this configuration, liquid adhesive can be allowed to flow down from the upper end to the lower end of the support bolt 16 through the hollow through hole 14a and the hollow through hole 19a, thereby fixing the lower end of the first vibration-damping rubber 18 to the slab upper surface 2a with the adhesive.

[0049] In this example, a groove 25a is also provided on the underside of the outer edge plate 25 of the outer fixing portion 24, allowing liquid adhesive to flow down from the upper end to the lower end of the support bolt 16, so that the underside of the outer edge plate 25 can be fixed to the slab upper surface 2a with adhesive. The other configurations are the same as those of the first embodiment shown in FIG.

[0050] With the configuration of the damping reinforcement member 50 of the second embodiment described above, when the floor material 4 is supported horizontally by multiple support legs 10, liquid adhesive can be allowed to flow down from the upper end of the support bolt 16, and the lower end of the first vibration-damping rubber 18 and the lower surface of the outer edge plate 25 can be fixed to the slab upper surface 2a with adhesive. Other effects are the same as those of the first embodiment shown in FIG.

[0051] FIG. 5 is a diagram showing a third embodiment of the damping reinforcing member 50, and is a side view similar to FIG. 3(A).

[0052] In this figure, the expanded diameter portion 15 has a larger diameter than the cylindrical portion 14, and is attached to the lower end of the cylindrical portion 14 so as to be rotatable about its axis. That is, in this example, an intermediate shaft 14b, the upper end of which has a smaller diameter than the cylindrical portion 14, is fixed to the lower end of the cylindrical portion 14, and the expanded diameter portion 15 is able to rotate freely relative to the cylindrical portion 14 around the vertical axis Z, centered on the intermediate shaft 14b.

[0053] In this example, the lower surface of the second vibration-isolating rubber 30 is positioned in direct contact with the upper surface of the enlarged diameter portion 15 . That is, in this example, the lower surface of the enlarged diameter portion 15 is integrally joined to the upper surface of the first vibration-damping rubber 18 by adhesive or the like, and the first vibration-damping rubber 18 and the second vibration-damping rubber 30 grip the outer periphery of the enlarged diameter portion 15 so that it cannot rotate around the axis relative to the cylindrical portion 14. The other configurations are the same as those of the first embodiment shown in FIG.

[0054] Due to the configuration of the damping reinforcement member 50 of the third embodiment described above, the cylindrical portion 14 can be freely rotated around the vertical axis Z while the lower surface of the first vibration-damping rubber 18 is fixed to the upper surface 2a of the slab and the enlarged diameter portion 15 is unable to rotate around the vertical axis Z. Furthermore, with this configuration, the lower surface of the second vibration-damping rubber 30 is positioned in direct contact with the upper surface of the enlarged diameter portion 15, so that the enlarged diameter portion 15 can be elastically supported between the first vibration-damping rubber 18 and the second vibration-damping rubber 30. Other effects are the same as those of the first embodiment shown in FIG.

[0055] FIG. 6 is a view showing a fourth embodiment of the damping reinforcing member 50, and is a side view similar to FIG. 3(A).

[0056] In this figure, the outer edge plate 25 positioned horizontally close to the slab upper surface 2a is made up of a lower outer edge plate 25b and an upper outer edge plate 25c, with a gap adjustment device 28 therebetween. The lower outer edge plate 25b is fixed to the slab upper surface 2a by preferably using screws, but may also be fixed by adhesive. The upper outer edge plate 25c is positioned at an adjustment distance Δ from the lower outer edge plate 25b. The gap adjusting device 28 is configured to be able to variably adjust the adjustment gap Δ.

[0057] The initial value of the adjustment interval Δ is set so that the lower surface of the horizontal support portion 22 is positioned horizontally at the above-mentioned support height h from the slab upper surface 2a. The initial value of this adjustment interval Δ is preferably 5 to 10 mm, for example. As mentioned above, the support height h is preferably set to the sum (total height) of the heights of the first vibration-isolating rubber 18 and the second vibration-isolating rubber 30 under normal conditions when the floor material 4 is not subjected to impact. In this state, the first vibration-isolating rubber 18 is compressed downward by the downward load supporting the floor material, but the second vibration-isolating rubber 30 is in a compressed state with no load or close to no load. By shortening the adjustment interval Δ from the initial value, the gap between the horizontal support portion 22 of the second vibration-damping rubber 30 and the first vibration-damping rubber 18 is eliminated, and the second vibration-damping rubber 30 is kept in a compressed state, thereby improving the responsiveness of the impact suppression effect of the floor material.

[0058] In Figure 6, the gap adjustment device 28 has a threaded rod 28a whose lower end is fixed to the lower outer edge plate 25b by welding or the like and which extends vertically upward through a through hole provided in the upper outer edge plate 25c, and an adjustment nut 28b that screws onto the threaded rod 28a. With this configuration, the adjustment nut 28b threadedly engaged with the threaded rod 28a is rotated to move the upper outer edge plate 25c up and down, thereby adjusting the size of the adjustment gap Δ. A compressible rubber plate, a compression spring, or a fixing nut may be provided between the lower outer edge plate 25b and the upper outer edge plate 25c. Furthermore, the structure of the gap adjusting device 28 is not limited to this example, and may be any other known structure. The other configurations and effects are the same as those of the first embodiment.

[0059] FIG. 7 is a diagram showing a fifth embodiment of the damping reinforcing member 50, and is a side view similar to FIG. 3(A). In this figure, the second vibration-isolating rubber 30 has an intermediate member 32 and a third vibration-isolating rubber 34. The intermediate member 32 has a lower support surface 30b located close to or in close contact with the upper surface of the first vibration-isolating rubber 18 or the enlarged diameter portion 15, and is located in close contact with the upper surface of the first vibration-isolating rubber 18 or the enlarged diameter portion 15. The third vibration-isolating rubber 34 is located between the horizontal support portion 22 and the intermediate member 32 . The intermediate member 32 and the third vibration-isolating rubber 34 are preferably made of the same elastic rubber, but may be made of different materials (for example, metal and elastic rubber). Furthermore, although it is preferable that the intermediate member 32 and the third vibration-isolating rubber 34 are integrally joined, they may be separate parts. The other configurations and effects are the same as those of the first embodiment.

[0060] FIG. 8 is a diagram showing the overall configuration of a damping reinforcement support leg 100 according to the present invention. In this figure, the damping reinforcement support leg 100 is a support leg that supports a double floor 1 consisting of a floor slab 2 and a floor material 4 positioned horizontally above it, and is equipped with a floor material support plate 12, support bolts 16, a first vibration-damping rubber 18, and a damping reinforcement member 50.

[0061] The floor material support plate 12 is fixed to the underside of the floor material 4 and has a female thread portion 11a centered on the vertical axis Z. The support bolt 16 has a male threaded portion 13 on its upper outer surface that screws into the female threaded portion 11a, a cylindrical portion 14 that is positioned vertically when in use, and an expanded diameter portion 15 that is fixed to the lower end of the cylindrical portion 14 when in use. The first vibration-isolating rubber 18 has a lower end surface located on the slab upper surface 2a of the floor slab 2, and elastically supports the downward displacement of the enlarged diameter portion 15. The damping reinforcement member 50 is fixed to the slab upper surface 2 a and elastically supports the upward displacement of the enlarged diameter portion 15 .

[0062] In FIG. 8, the damping reinforcement member 50 has a restraining fixing member 20 and a second vibration-isolating rubber 30. The restraining and fixing member 20 also has a horizontal support portion 22 and an outer fixing portion 24. The restraining and fixing member 20 is preferably a one-piece member made of metal or plastic.

[0063] In this example, the support bolt 16 (the cylindrical portion 14 and the expanded diameter portion 15) has a hollow through-hole 14a that passes vertically along its axis. The first vibration-proof rubber 18 also has a hollow through hole 19a that passes vertically along an axis that coincides with the hollow through hole 14a, and a recessed groove 19b that is provided in the bottom surface and communicates with the hollow through hole 19a.

[0064] With this configuration, liquid adhesive can be allowed to flow down from the upper end to the lower end of the support bolt 16 through the hollow through hole 14a and the hollow through hole 19a, thereby fixing the lower end of the first vibration-damping rubber 18 to the slab upper surface 2a with the adhesive. However, this configuration is not essential and other well-known configurations may be used.

[0065] In this example, an intermediate shaft 14b, the upper end of which has a smaller diameter than the cylindrical portion 14, is fixed to the lower end of the cylindrical portion 14, and the expanded diameter portion 15 is able to rotate freely relative to the cylindrical portion 14 around the vertical axis Z, centered on the intermediate shaft 14b. The lower surface of the enlarged diameter portion 15 is integrally joined to the upper surface of the first vibration-isolating rubber 18 . In this example, the lower surface of the second vibration-isolating rubber 30 is positioned in direct contact with the upper surface of the enlarged diameter portion 15 .

[0066] With this configuration, while the lower surface of the first vibration-damping rubber 18 is fixed to the upper surface 2a of the slab and the expanded diameter portion 15 cannot rotate around the vertical axis Z, the cylindrical portion 14 can be freely rotated around the vertical axis Z. Furthermore, with this configuration, the lower surface of the second vibration-damping rubber 30 is positioned in direct contact with the upper surface of the enlarged diameter portion 15, so that the enlarged diameter portion 15 can be elastically supported between the first vibration-damping rubber 18 and the second vibration-damping rubber 30. However, this configuration is not essential and other well-known configurations may be used.

[0067] In this example, the outer edge plate 25 positioned horizontally close to the slab upper surface 2a is made up of a lower outer edge plate 25b and an upper outer edge plate 25c, and has a gap adjustment device 28 therebetween. The lower outer edge plate 25b is fixed to the slab upper surface 2a by preferably using screws, but may also be fixed by adhesive. The upper outer edge plate 25c is positioned at an adjustment distance Δ from the lower outer edge plate 25b. The gap adjusting device 28 is configured to be able to variably adjust the adjustment gap Δ.

[0068] With this configuration, the adjustment nut 28b threadedly engaged with the threaded rod 28a is rotated to move the upper outer edge plate 25c up and down, thereby adjusting the size of the adjustment gap Δ. However, this configuration is not essential and other well-known configurations may be used.

[0069] In this example, the outer fixing portion 24 is hollow and frustoconical, and the overall shape of the restraining fixing member 20 is an inverted frustoconical bowl. Furthermore, in this example, the first vibration-damping rubber 18, the enlarged diameter portion 15, the second vibration-damping rubber 30, and the restraining fixing member 20 are integrated by adhesive or the like, so that the lower end of the cylindrical portion 14 can freely rotate around the vertical axis Z relative to the enlarged diameter portion 15. However, this configuration is not essential and other well-known configurations may be used.

[0070] According to the above-described configuration of the present invention, in use, the support bolt 16 having the male thread portion 13 that screws into the female thread portion 11a of the floor material support plate 12 fixed to the underside of the floor material extends vertically downward. In addition, the lower end face of the first vibration-isolating rubber 18 is located on the slab upper surface 2a of the floor slab 2, and elastically supports the downward displacement of the enlarged diameter portion 15 of the support bolt 16. Therefore, by screwing the male threaded portion 13 of the support bolt 16 into the female threaded portion 11a of the floor material support plate 12 fixed to the underside of the floor material, and then rotating the support bolt 16 around the vertical axis Z, the distance between the floor slab 2 and the floor material 4 can be adjusted to support the floor material 4.

[0071] Furthermore, when the support bolt 16 maintains the gap between the floor slab 2 and the floor material 4 and supports the floor material 4, only compressive stress due to the downward load supporting the floor material 4 acts on the cylindrical portion 14 of the support bolt 16.

[0072] Additionally, the first vibration-isolating rubber 18 elastically supports the downward displacement of the enlarged diameter portion 15 of the support bolt 16, and the horizontal support portion 22 of the restraining fixing member 20 is positioned horizontally at a predetermined support height h from the slab upper surface 2a. Furthermore, the second vibration-isolating rubber 30 is positioned between the horizontal support portion 22 and the first vibration-isolating rubber 18 or the upper end surface of the enlarged diameter portion 15, and elastically supports the upward displacement of the enlarged diameter portion 15. Therefore, the downward and upward displacement of the enlarged diameter portion 15 caused by the up and down vibration of the floor material 4 due to impact is elastically supported by the first vibration-damping rubber 18 and the second vibration-damping rubber 30, absorbing the vibration energy, thereby damping downward and upward vibrations.

[0073] Furthermore, when the support leg 10 is an existing product, the damping reinforcement member 50 can be retrofitted to the existing product. Furthermore, the height of the floor material 4 can be adjusted in the same way as before, so the downward and upward vibrations acting on the floor material 4 can be damped independently without hindering the workability of the conventional double floor construction method.

[0074] The scope of the present invention is not limited to the above-described embodiments, but is indicated by the claims, and further includes all modifications within the meaning and scope equivalent to the claims. [Explanation of symbols]

[0075] K1 first elastic modulus, K2 second elastic modulus, X1, X2 linear elastic range, H floor surface height, h support height, Z vertical axis, Δ adjustment interval, 1 double floor, 2 floor slab, 2a slab top surface, 4 floor material, 5 base material, 6 underlayment material, 7 floor finishing material, 8 opening (or gap), 10 support leg, 11 nut member, 11a female thread portion, 12 floor material support plate, 13 male thread portion, 14 cylindrical portion, 14a hollow through hole, 14b intermediate shaft, 15 enlarged portion, 16 support bolt, 17 torque transmission portion (groove or protrusion), 18 first vibration-proof rubber, 18a upper support surface, 19a hollow through hole, 19b recessed groove, 20 restraint fixing member, 22 horizontal support portion, 22a first hollow hole, 24 outer fixing portion, 25 Outer edge plate, 25a groove, 25b lower outer edge plate, 25c upper outer edge plate, 26 connecting plate, 28 spacing adjustment device, 28a threaded rod, 28b adjustment nut, 30 second vibration-isolating rubber, 30a second hollow hole, 30b lower support surface, 32 intermediate member, 34 third vibration-isolating rubber, 50 damping reinforcement member, 100 damping reinforcement support leg

Claims

1. A damping reinforcement member for a support leg that supports a double floor consisting of a floor slab and a floor material positioned horizontally above the floor slab, The support legs are A flooring support plate fixed to the underside of the flooring and having an internal thread portion centered on a vertical axis; a support bolt having a cylindrical portion that has an external thread portion on its upper outer peripheral surface that threads into the internal thread portion and that extends vertically downward in an in-use state, and an expanded diameter portion that is fixed to a lower end of the cylindrical portion in an in-use state; a first vibration-isolating rubber whose lower end surface is located on the upper surface of the floor slab and which elastically supports downward displacement of the enlarged diameter portion; The damping reinforcement member is a restraining and fixing member having a horizontal support portion that has a first hollow hole through which the cylindrical portion passes and is positioned horizontally at a predetermined support height from the upper surface of the slab; A damping reinforcement member for a support leg, comprising: a second vibration-damping rubber having a second hollow hole through which the cylindrical portion passes, positioned between the horizontal support portion and the first vibration-damping rubber or the upper end surface of the enlarged diameter portion, and elastically supporting the upward displacement of the enlarged diameter portion.

2. the first vibration-isolating rubber rotatably holds the enlarged diameter portion, the restraining and fixing member has an outer fixing portion that holds the horizontal support portion horizontally and is fixed to the upper surface of the slab, The damping reinforcement member for a support leg according to claim 1 , wherein the second vibration-isolating rubber rotatably holds the enlarged diameter portion.

3. 2. The damping reinforcement member of claim 1, wherein the second elastic coefficient of the second vibration-isolating rubber with respect to the upward displacement is set to be substantially the same as the first elastic coefficient of the first vibration-isolating rubber with respect to the downward displacement.

4. the enlarged diameter portion is a rotating body having a diameter larger than that of the cylindrical portion and centered on a vertical axis, and is integrally fixed to a lower end of the cylindrical portion, the first vibration-isolating rubber has an upper support surface that is located close to or in close contact with the lower surface of the enlarged diameter portion and that supports the enlarged diameter portion so that it can rotate about a vertical axis; The damping reinforcement member of a support leg as described in claim 1, wherein the second vibration-damping rubber is located in close proximity to or in close contact with the upper surface of the first vibration-damping rubber or the enlarged diameter portion, and has a lower support surface that enables rotation of the enlarged diameter portion around the vertical axis.

5. The damping reinforcement member of the support leg described in claim 2, wherein the outer fixing portion has an outer edge plate positioned horizontally close to the upper surface of the slab, and a plurality of connecting plates that connect the outer edge plate and the horizontal support portion vertically or inclined.

6. The support bolt has a hollow through-hole that passes vertically along its axis, the first vibration-isolating rubber has a recessed groove formed on its bottom surface and communicating with the hollow through-hole, The damping reinforcement member of the support leg as described in claim 5, wherein the outer edge plate is configured so that a liquid adhesive can be flowed down from the upper end to the lower end of the support bolt to adhesively fix its lower surface to the upper surface of the slab.

7. the enlarged diameter portion has a diameter larger than that of the cylindrical portion and is attached to a lower end of the cylindrical portion so as to be rotatable about its axis; 2. The damping reinforcement member for a support leg according to claim 1, wherein the first vibration-isolating rubber and the second vibration-isolating rubber grip the outer periphery of the enlarged diameter portion so as not to rotate about the axis.

8. The damping reinforcement member of the support leg described in claim 5, wherein the outer edge plate has a lower outer edge plate fixed to the upper surface of the slab, an upper outer edge plate whose upper end is fixed to the horizontal support portion and whose lower end is located at an adjustment distance from the lower outer edge plate, and a spacing adjustment device that can variably adjust the adjustment distance.

9. The damping reinforcement member for a support leg as described in claim 4, wherein the second vibration-damping rubber has an intermediate member having the lower support surface and positioned in close contact with the upper surface of the first vibration-damping rubber or the enlarged diameter portion, and a third vibration-damping rubber positioned between the horizontal support portion and the intermediate member.

10. The damping reinforcement member for a support leg according to claim 2, wherein the fixing means for the lower end of the outer fixing part is nailed, screwed or glued.

11. A damping reinforcement support leg that supports a double floor consisting of a floor slab and a floor material positioned horizontally above the floor slab, A flooring support plate fixed to the underside of the flooring and having an internal thread portion centered on a vertical axis; a support bolt having a cylindrical portion that has an external thread portion on its upper outer peripheral surface that threads into the internal thread portion and that extends vertically downward in an in-use state, and an expanded diameter portion that is fixed to a lower end of the cylindrical portion in an in-use state; a first vibration-isolating rubber whose lower end surface is located on the upper surface of the floor slab and which elastically supports downward displacement of the enlarged diameter portion; a damping reinforcement member fixed to the upper surface of the slab and elastically supporting the upward displacement of the enlarged diameter portion, The damping reinforcement member is a restraining and fixing member having a horizontal support portion that has a first hollow hole through which the cylindrical portion passes and is positioned horizontally at a predetermined support height from the upper surface of the slab; A damping-enhanced support leg having a second hollow hole through which the cylindrical portion passes, and a second vibration-damping rubber located between the horizontal support portion and the first vibration-damping rubber or the upper end surface of the enlarged diameter portion, elastically supporting the upward displacement of the enlarged diameter portion.

12. the enlarged diameter portion has a diameter larger than that of the cylindrical portion and is attached to a lower end of the cylindrical portion so as to be rotatable about its axis; The support leg with enhanced damping according to claim 11, wherein the first vibration-isolating rubber and the second vibration-isolating rubber grip the outer periphery of the enlarged diameter portion so as not to rotate about the axis.

13. The support bolt has a hollow through-hole that passes vertically along its axis, The damping-enhanced support leg according to claim 11 , wherein the first and second vibration-isolating rubbers have recessed grooves that communicate the hollow through-holes with the lower surfaces of the first vibration-isolating rubbers.

14. the support bolt has a torque transmission portion for rotating the cylindrical portion about a vertical axis, The support leg with enhanced damping according to claim 11 , wherein the torque transmission portion is a groove or a protrusion provided on an upper end of the cylindrical portion.

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