Vibration-isolating support legs for double floor

Abstract

The present invention provides vibration-damping support legs for double floors that can independently dampen downward and upward vibrations acting on the flooring material, and that enable easy construction of double floors. [Solution] The vibration-damping support leg 10 for a double floor 1 consisting of a floor slab 2 and a flooring material 4 positioned horizontally above it comprises: a flooring material support plate 12 fixed to the lower surface of the flooring material 4 and having a female threaded portion 11a centered on a vertical axis Z; a support bolt 16 having a cylindrical portion 14 extending vertically downward and having a male threaded portion 13 on its upper outer circumference that screws into the female threaded portion 11a, and an enlarged diameter portion 15 provided at the lower end of the cylindrical portion 14; and a vibration-damping support device 50 fixed to the upper surface 2a of the floor slab 2 and elastically supporting the downward and upward displacement of the enlarged diameter portion 15. The cylindrical portion 14 of the support bolt 16 is held so as to be rotatable about the vertical axis Z relative to the vibration-damping support device 50.

Description

Technical Field

[0001] The present invention relates to an anti-vibration support leg for a double floor composed of a floor slab and a floor material horizontally located above it.

Background Art

[0002] As a floor finish of an RC multi-family housing, a dry double floor composed of a floor slab and a floor material horizontally located above it has been conventionally widespread. In the following description, the dry double floor is simply referred to as "double floor". In a double floor, in order to maintain the interval between the floor slab and the floor material and support the floor material, anti-vibration support legs have been conventionally used. A conventional anti-vibration support leg is disclosed in, for example, Patent Document 1.

[0003] The support leg of Patent Document 1 includes a floor contact base made of anti-vibration rubber having a hole formed in a substantially upper half of the central portion, and a support bolt having a protruding portion bulging in the lateral direction formed at a lower end portion. The hole opens on the upper surface of the floor contact base, and an annular groove-shaped recess for accommodating the protruding portion is formed therein. The support bolt is erected rotatably with respect to the floor contact base by inserting the lower end portion from the opening of the floor contact base into the hole and accommodating the protruding portion in the recess. By using such an anti-vibration rubber, the lightweight floor impact sound insulation performance can be greatly improved with respect to the slab bare state.

[0004] However, regarding the weight floor impact sound insulation performance of the double floor, even when using anti-vibration support legs, it tends to deteriorate compared to the slab bare state due to resonance phenomena in the under-floor air layer and the like. Therefore, in order to solve this problem, for example, the means of Patent Documents 2 and 3 have been proposed.

[0005] The "double floor structure" described in Patent Document 2 is a double floor structure in which multiple floor base materials are supported at a predetermined height level by a group of support legs erected on a floor base made of a concrete floor slab or the like via an elastic base. This double floor structure has a fastening panel provided in contact with the floor base material, a vibration damping material provided in contact with the fastening panel, and a floor finishing material laid on the vibration damping material. The fastening panel is made of wood fiberboard with a thickness of 4 to 6 mm and a specific gravity of 0.8 to 1.2. The vibration damping material is flexible with a thickness of 3 to 5 mm and a specific gravity of 2.0 to 2.5. The floor finishing material has a thickness of 3 to 6 mm.

[0006] Patent Document 3 describes a "vibration-damping floor support leg structure" comprising a lower metal plate placed on a floor base, a vibration-damping material placed on the lower metal plate, an upper metal plate pressed against the vibration-damping material, and a support leg erected on the upper metal plate with its lower end fixed. This vibration-damping floor support leg structure is fixed to the floor base by utilizing the fact that adhesive applied to the upper metal plate drips from the upper metal plate to the lower metal plate, covering the lower metal plate and the floor base, and seeping between the lower metal plate and the floor base. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Japanese Patent Publication No. 2002-81195 [Patent Document 2] Japanese Patent Publication No. 2009-270372 [Patent Document 3] Japanese Patent Publication No. 2005-320818 [Overview of the project] [Problems that the invention aims to solve]

[0008] Figure 1 is an explanatory diagram of conventional vibration-damping support legs 110 and 210. Figure 1(A) is a partial cross-sectional side view of the support leg 110 of Patent Document 1, and Figure 1(C) is a partial cross-sectional side view of the vibration-damping floor support leg structure 200 of Patent Document 3. Figure 1(B) is a perspective view showing the lower end (upper end in Figure 1(B)) of the support bolt 116 of Patent Document 1 being fitted into the hole 152 of the floor base 150.

[0009] The support leg 110 disclosed in Patent Document 1 has a floor contact base 150 made of vibration-damping rubber at its lower end, which has the effect of suppressing downward vibration of the floor material 4. Furthermore, the support leg 110 of Patent Document 1 has a protruding portion 115 that can rotate freely around the vertical axis Z within the hole 152, making it easy to adjust the floor height during construction and enabling efficient construction of the double floor 1. However, as shown in Figure 1(A), the rubber on the side (upper side) into which the support bolt 116 is inserted in the floor base 150 is thin and easily deformed, making it difficult for a tensile spring to be generated when the floor 1 lifts up. Therefore, even if the bottom surface of the floor base 150 is bonded to the floor base 102, the support leg 110 of Patent Document 1 could not be expected to have the effect of suppressing upward vibration of the floor material 4.

[0010] Patent Document 2 discloses a configuration in which a vibration damping material made of a mixture such as asphalt resin is included in the base material of a double floor. In this case, by using a relatively heavy vibration damping material, the vibration acting on the support legs due to the weight of the floor itself is suppressed, and thus the sound-dampening effect is also enhanced. However, using vibration damping materials not only increases costs, but the installation of these heavy materials is also not easy.

[0011] Since the support leg 210 in Patent Document 3 is arranged in a rising shape from the upper metal plate 261 on the vibration-damping material 220, it can suppress downward vibration of the floor material 4. Furthermore, as shown in Figure 1(C), the support leg 210 of Patent Document 3 has its lower end fixed to an upper metal plate 261 on the vibration-damping material 220, and the upper metal plate 261 is pressed against the vibration-damping material 220, with the lower metal plate 262 and the floor base 202 being bonded together. Although this configuration allows the support leg 210 of Patent Document 3 to suppress upward vibration of the floor material 4, due to this configuration, the support leg 210 cannot be rotated around the vertical axis Z relative to the vibration-damping material 220. Therefore, the support leg 210 in Patent Document 3 required extra effort to adjust the floor height during construction.

[0012] This invention was devised to solve the problems described above. Specifically, the object of this invention is to provide a vibration-damping support leg for a double floor that can dampen downward and upward vibrations acting on the flooring material on its own, and that enables easy construction of a double floor. [Means for solving the problem]

[0013] According to the present invention, a vibration-damping support leg for a double floor consisting of a floor slab and a flooring material positioned horizontally above it, A floor support plate fixed to the underside of the floor material and having a female threaded portion centered on a vertical axis, A support bolt having a cylindrical portion extending vertically downward and having a male threaded portion that screws into the female threaded portion on its upper outer circumference, and an enlarged diameter portion provided at the lower end of the cylindrical portion, The floor slab is fixed to the upper surface of the slab and includes a vibration-damping support device that elastically supports the downward and upward displacement of the enlarged diameter portion. A vibration-isolating support leg for a double floor is provided, wherein the cylindrical portion of the support bolt is held so as to be rotatable about a vertical axis relative to the vibration-isolating support device. [Effects of the Invention]

[0014] According to the configuration of the present invention described above, in the use state, the support bolt has a cylindrical portion that extends vertically downward and has a male screw portion that engages with the female screw portion of the floor material support plate fixed to the lower surface of the floor material. At the lower end of the cylindrical portion, an enlarged diameter portion is provided. Further, the enlarged diameter portion of the support bolt is elastically supported against downward displacement and upward displacement by an anti-vibration support device fixed to the upper surface of the floor slab. Therefore, since the anti-vibration support device absorbs the vibration energy of the enlarged diameter portion, the support leg of the present invention can support the floor material while attenuating the downward and upward vibrations acting on the floor material.

[0015] Also, the cylindrical portion of the support bolt is held rotatable about the vertical axis with respect to the anti-vibration support device, and the male screw portion formed on the upper outer peripheral surface engages with the female screw portion of the floor material support plate. With this configuration, by rotating the support bolt about the vertical axis in a state where the male screw portion of the support bolt is screwed into the female screw portion of the floor material support plate fixed to the lower surface of the floor material, the distance between the floor slab and the floor material can be adjusted.

[0016] Therefore, the support leg of the present invention can adjust the height of the floor material in the same manner as a conventional support leg in which the support bolt is rotatable about the vertical axis with respect to the floor contact base, so that it is possible to easily construct a double floor without substantially hindering the workability of the conventional double floor construction method.

[0017] Also, the support leg of the present invention can attenuate the downward and upward vibrations acting on the floor material independently without using a heavy vibration damping material in the construction. Therefore, the support leg of the present invention can more easily construct a double floor that can attenuate downward and upward vibrations than a conventional support leg that uses a vibration damping material in the construction.

Brief Description of the Drawings

[0018] [Figure 1] It is an explanatory diagram of a conventional anti-vibration support leg. [Figure 2] It is an overall configuration diagram of a double floor of the first embodiment and an anti-vibration support leg that supports it. [Figure 3]It is a partial cross-sectional side view of the lower end portion of the vibration isolation support leg of the first embodiment. [Figure 4] It is an explanatory view of the lower end portion of the vibration isolation support leg of the second embodiment. [Figure 5] It is a partial cross-sectional side view of the lower end portion of the vibration isolation support leg of the third embodiment. [Figure 6] It is a partial cross-sectional side view of the lower end portion of the vibration isolation support leg of the third embodiment. [Figure 7] It is a (A) perspective view, (B) cross-sectional side view, (C) bottom view, and (D) is a cross-sectional view taken along the C-C line of FIG. 7(B) of the vibration isolation support device of the fourth embodiment. <00 00105> [Figure 8] It is a partial cross-sectional side view of the vibration isolation support leg of the fourth embodiment. [Figure 9] It is an overall configuration diagram of the double floor of the fifth embodiment and the vibration isolation support leg that supports it. [Figure 10] It is a cross-sectional side view of the lower end portion of the vibration isolation support leg of the fifth embodiment. [[ID=二十二]]

Modes for Carrying Out the Invention

[0019] Hereinafter, preferred embodiments of the present invention will be described in detail based on the accompanying drawings. In each figure, the same reference numerals are assigned to common parts, and duplicate explanations are omitted.

[0020] As described above, regarding the impact sound insulation performance of the heavy floor of the double floor, even if vibration isolation support legs are used, due to resonance phenomena in the underfloor air layer, etc., there is a tendency to deteriorate compared to the slab bare state. Normally, conventional support legs for double floors are configured such that the compression spring works strongly when the floor sinks, but it is difficult for a tension spring to occur when it rises. Therefore, although the conventional support legs have the effect of reducing the downward vibration of the floor material by the vibration isolation rubber at its lower end, the effect of reducing the upward vibration of the floor material cannot be expected.

[0021] Japanese Patent Application No. 2024-94472 publishes simulation results comparing the vibration reduction effect of a conventional support leg and an improved vibration-damping support leg 10. Conventional support legs have the effect of suppressing downward vibration of the floor material with vibration-damping rubber at the lower end, but they do not have the effect of suppressing upward vibration of the floor material. In contrast, the improved vibration-damping support leg has the effect of suppressing downward vibration of the floor material with vibration-damping rubber at the lower end, and also has the effect of suppressing upward vibration of the floor material. In the improved vibration-damping support leg, the elastic modulus for upward displacement (hereinafter, "second elastic modulus K2") and the elastic modulus for downward displacement (hereinafter, "first elastic modulus K1") were set to be the same. As a result, the improved vibration acceleration level reduction was significantly better than that of conventional support legs in the frequency range above 31.5 Hz, and in particular, an improvement of approximately 5 dB was obtained even at 63 Hz, which is important for the sound insulation performance of heavy floor impact noise in double floors.

[0022] The vibration-damping support leg 10 according to the present invention is intended to be an improved support leg as described above. In the simulation results described above, the second elastic modulus K2 for upward displacement is set to be the same as the first elastic modulus K1 for downward displacement, but the present invention is not limited to this, and it is sufficient if they are substantially the same. In other words, it is preferable that K2 ≈ K1, but the elastic modulus ratio K2 / K1 can be between 0.5 and 1.5.

[0023] (First Embodiment) Figure 2 is an overall diagram of the double floor 1 of the first embodiment and the vibration-isolating support legs 10 that support it. In the following description, the vibration-isolating support legs 10 will simply be referred to as "support legs 10". In this diagram, the double floor 1 consists of a floor slab 2 and flooring material 4 located horizontally above it. Floor slab 2 is, for example, a concrete structural floor or a wooden floor. Although only one support leg 10 is shown in this diagram, multiple support legs are usually distributed and placed on the floor slab 2. The flooring material 4 is supported by multiple support legs 10 and extends horizontally.

[0024] In this example, the flooring material 4 includes a base material 5 formed horizontally on the support legs 10, a base material 6 formed on the base material 5, and a floor finishing material 7 formed on the base material 6. The base material 5 is, for example, particleboard, structural plywood, etc. The thickness of the base material 5 is, for example, 20 mm. The base material 6 may be, for example, particleboard, structural plywood, gypsum board, etc. The base material 6 may be omitted or may be constructed in multiple layers. Floor finishing material 7 is, for example, hardwood flooring, carpet, etc.

[0025] In this example, an opening or gap is provided in the flooring material 4 (base material 5 in this example) directly above the support leg 10. Hereafter, this opening or gap will simply be referred to as "opening 8".

[0026] In Figure 2, the support leg 10 is a support leg that supports a double floor 1 consisting of a floor slab 2 and flooring material 4 located horizontally above it, and is equipped with a flooring material support plate 12, support bolts 16, and vibration-damping support device 50.

[0027] The floor support plate 12 is fixed to the lower surface of the floor material 4 (base material 5 in this example) and has a female threaded portion 11a centered on the vertical axis Z. In this example, a nut member 11 having the female threaded portion 11a is fixed to the lower surface of the floor support plate 12. Note that the shape of the nut member 11 is not limited to this example and may be any other shape. Furthermore, the means for fixing the floor support plate 12 and the nut member 11 is, for example, nails, screws, or adhesive.

[0028] The support bolt 16 has a cylindrical portion 14 having a vertical axis Z and positioned vertically in use, and an enlarged diameter portion 15 provided at the lower end of the cylindrical portion 14 in use. The cylindrical portion 14 has a male threaded portion 13 on its upper outer circumference that screws into the female threaded portion 11a of the nut member 11. The male threaded portion 13 may be provided over the entire length of the cylindrical portion 14. Furthermore, the support bolt 16 has a torque transmission part 17 for rotating the cylindrical part 14 around the vertical axis Z. In this example, the torque transmission part 17 is a groove (or projection) provided at the upper end of the cylindrical part 14. The torque transmission part 17 is provided so that it can be rotated around the vertical axis Z by a screwdriver or the like through the opening 8 in the floor material 4 (base material 5 in this example).

[0029] The vibration isolation support device 50 is fixed to the upper surface 2a of the floor slab 2 when in use, and is a device that elastically supports the downward and upward displacement of the enlarged diameter portion 15.

[0030] Figure 3 is a partial cross-sectional side view of the lower end of the support leg 10 of the first embodiment. In this figure, Figure 3(A) is an exploded view, Figure 3(B) is an assembled view of Figure 3(A), and Figure 3(C) is a partial cross-sectional side view of the lower end of the support leg 10 in use. The vibration-damping support device 50 of the first embodiment includes a first vibration-damping rubber 20 and a displacement transmission member 30. The first vibration-damping rubber 20 also has an upper support surface 21 located in close proximity to or in close contact with the lower surface of the enlarged diameter portion 15. Furthermore, the upper support surface 21 of the first embodiment holds the enlarged diameter portion 15 so that it can rotate around the vertical axis Z relative to the first vibration-damping rubber 20. The upper support surface 21 may be coated with grease or may have a low-friction sheet attached to it to facilitate the rotation of the enlarged diameter portion 15 around the vertical axis Z. In Figure 3(A), the enlarged diameter portion 15 is larger in diameter than the cylindrical portion 14 and is a rotating body about the vertical axis Z, and is integrally fixed to the lower end of the cylindrical portion 14.

[0031] The first vibration-damping rubber 20 is designed so that its lower end surface can adhere to the upper slab surface 2a of the floor slab 2 when in use, and the upper surface of the first vibration-damping rubber 20 has an upper support surface 21 that is close to or in close contact with the lower surface of the enlarged diameter portion 15. With this configuration, the first vibration-damping rubber 20, sandwiched between the upper slab surface 2a and the enlarged diameter portion 15, is pushed downward by the enlarged diameter portion 15, generating an elastic force as a compression spring, and thus elastically supporting the downward displacement of the enlarged diameter portion 15. Therefore, the vibration-damping support device 50 can dampen downward vibrations of the double floor. The first vibration-damping rubber 20 is a rotating body about the vertical axis Z, and is preferably, for example, a prefix cone or a cylindrical shape.

[0032] The displacement transmission member 30 of the first embodiment is an upper cover 31 that covers the upper part of the first vibration-damping rubber 20, including the enlarged diameter portion 15, and has a first hollow hole 50a through which the cylindrical portion 14 of the support bolt 16 can pass. Around the first hollow hole 50a of the upper cover 31 illustrated in Figure 3, a recess 32 is provided for housing the dam portion 22. The upper cover 31 is most preferably made of metal so as to suppress the upward force of the enlarged diameter portion 15, but it may also be made of resin or wood. For example, if the upper cover 31 is made of resin, it is preferably made of fiber-reinforced resin. When manufacturing the support leg 10 of this embodiment, adhesive 40 is applied to the upper surface of the first vibration-damping rubber 20 or the lower surface of the upper cover 31. The area to which the adhesive 40 is applied is the area in which the upper cover 31 and the first vibration-damping rubber 20 can come into contact, and is the area outside the horizontal direction of the enlarged diameter portion 15 in the usage state. For example, when applying adhesive 40 to the upper cover 31, the application is made while avoiding the recessed portion 32. This prevents the adhesive 40 from adhering to the enlarged diameter portion 15. In the upper cover 31 of the first embodiment, the presence of the recessed portion 32 makes it easy to see at a glance the area on the upper cover 31 where adhesive 40 should be applied.

[0033] Next, the enlarged diameter portion 15 is placed on the upper support surface 21 of the first vibration-damping rubber 20, and the cylindrical portion 14 is passed through the first hollow hole 50a from the upper end, and the upper cover 31 is placed over the first vibration-damping rubber 20. The first hollow hole 50a is set to be larger than the outer diameter of the cylindrical portion 14. An elastic packing 33 (for example, a rubber packing) may be sandwiched between the upper cover 31 and the enlarged diameter portion 15. This prevents contact between the upper cover 31 and the enlarged diameter portion 15, and prevents the generation of noise due to such contact. As a result, the upper cover 31 covers the upper surface of the first vibration-damping rubber 20 and is bonded to the first vibration-damping rubber 20 by adhesive 40. This allows the enlarged diameter portion 15 to be rotatably held between the first vibration-damping rubber 20 and the upper cover 31, so that the cylindrical portion 14 can rotate freely around the vertical axis Z relative to the vibration-damping support device 50.

[0034] With the configuration of the support legs 10 described above, the support bolt 16 can be positioned vertically by screwing the male threaded portion 13 at the top of the cylindrical part into the female threaded portion 11a of the floor material support plate 12 fixed to the underside of the floor material 4, thereby positioning the floor material 4 above the floor slab 2. In this state, the gap between the floor slab 2 and the flooring material 4 (for example, the floor height H from the top surface 2a of the slab to the top surface 5 of the base material 5) can be adjusted by rotating the torque transmission part 17 (for example, a positive groove or a negative groove) around the vertical axis Z using a screwdriver or the like through the opening 8.

[0035] For example, as shown in the example in Figure 3, the vibration isolation support device 50 may have a first vibration isolation rubber 20 that extends from the outer edge of the upper support surface 21 and surrounds the outer circumference of the enlarged diameter portion 15. The presence of the dam portion 22 clearly defines the area of ​​the upper surface of the first vibration-damping rubber 20 to which the adhesive 40 should be applied (in this example, the area horizontally outside the dam portion 22). The dam portion 22 also blocks the adhesive 40 applied to the first vibration-damping rubber 20, preventing it from adhering to the lower surface of the enlarged diameter portion 15 or the upper support surface 21. As a result, the vibration-damping support device 50 can hold the enlarged diameter portion 15, sandwiched between the first vibration-damping rubber 20 and the upper cover 31, so that it can rotate around the vertical axis Z relative to the upper support surface 21. Furthermore, the presence of the dam portion 22 allows the enlarged diameter portion 15 to be positioned within the dam portion 22. Furthermore, the inside of the area enclosed by the dam portion 22 may be coated with grease or have a low-friction sheet attached to it, so that the enlarged diameter portion 15 can rotate easily. In this case, the presence of the dam portion 22 prevents the adhesive 40 from coming into contact with the grease or low-friction sheet.

[0036] Furthermore, the displacement transmission member 30 (upper cover 31) has a lower support surface 50b that is close to or in close contact with the upper surface of the enlarged diameter portion 15. The lower support surface 50b is located inside the recessed portion 32 of the upper cover 31. Since the enlarged diameter portion 15 is located between the inside of the ridge portion 22 and the inside of the recessed portion 32, and the adhesive 40 is applied only to the outside of the recessed portion 32 when it is applied to the upper cover 31, the adhesive 40 does not adhere to the enlarged diameter portion 15. As a result, the lower support surface 50b can also hold the enlarged diameter portion 15 in a rotatable manner. Therefore, the vibration isolation support device 50 can hold the enlarged diameter portion 15, which is integrally fixed to the lower end of the cylindrical portion 14, between the first vibration isolation rubber 20 and the upper cover 31, so that the enlarged diameter portion 15 can be held rotatably around the vertical axis Z, and thus the cylindrical portion 14 can be held rotatably around the vertical axis Z. Furthermore, with this configuration, the upper cover 31 can be integrally joined to the first vibration isolation rubber 20 while maintaining the state in which the enlarged diameter portion 15 is rotatably held between the first vibration isolation rubber 20 and the upper cover 31.

[0037] With this configuration, the upper cover 31 can transmit the upward displacement of the enlarged diameter portion 15 to the first vibration-damping rubber 20 via the adhesive 40, as the enlarged diameter portion 15, displaced upward, pushes up the lower support surface 50b. As a result, the elastic force acting as a tensile spring in the first vibration-damping rubber 20 can elastically support the upward displacement of the enlarged diameter portion 15, and the vibration-damping support device 50 can also dampen upward vibrations of the double floor.

[0038] The second elastic modulus K2 of the first vibration-damping rubber 20 with respect to upward displacement is preferably set to be the same as the first elastic modulus K1 of the first vibration-damping rubber 20 with respect to downward displacement. However, the present invention is not limited to this, and it is sufficient if they are substantially the same. In other words, as described above, the elastic modulus ratio K2 / K1 should be between 0.5 and 1.5. Furthermore, it is desirable that the linear elastic range X2 when the first vibration-damping rubber 20 is displaced upward and the linear elastic range X1 when the first vibration-damping rubber 20 is displaced downward are greater than the maximum amplitude of the double floor 1 (especially the floor material 4). The maximum amplitude of the floor material 4 is, for example, ±5 mm.

[0039] Furthermore, the support bolt 16 (cylindrical portion 14 and enlarged diameter portion 15) has a hollow through-hole 14a that penetrates vertically along its axis. The first vibration-damping rubber 20 has a hollow through-hole 23 that penetrates vertically along the axis coinciding with the hollow through-hole 14a, and a groove 24 provided on its bottom surface that communicates with the hollow through-hole 23.

[0040] This configuration allows the liquid adhesive 41 to flow down from the upper end of the support bolt 16 to the lower end of the vibration-damping support device 50 through the hollow through-holes 14a and 23, as shown in Figure 3(C). This makes it easy to spread the liquid adhesive 41 between the lower end of the first vibration-damping rubber 20 and the upper surface of the slab 2a, even after adjusting the gap between the floor slab 2 and the flooring material 4 (for example, the floor height H from the upper surface of the slab 2a to the upper surface of the base material 5). Therefore, the support leg of this embodiment allows the lower end of the first vibration-damping rubber 20 to be easily fixed to the upper surface of the slab 2a with the liquid adhesive 41. The gap between the floor slab 2 and the flooring material 4 is adjusted by rotating the torque transmission unit 17 around the vertical axis Z using a screwdriver or the like. After the adjustment, the liquid adhesive 41 is injected into the threaded portion between the female threaded portion 11a of the nut member 11 and the male threaded portion 13 of the cylindrical portion 14, as well as into the hollow through hole 14a, as shown in Figure 2. As a result, the threaded portion between the nut member 11 and the cylindrical portion 14 is fixed by the hardened liquid adhesive 41, thus preventing fluctuations in the gap between the floor slab 2 and the flooring material 4.

[0041] In the first embodiment, the vibration-damping support device 50, with the floor material 4 horizontally supported by a plurality of support legs 10, allows liquid adhesive to flow down from the upper end of the support bolt 16, thereby fixing the lower end of the first vibration-damping rubber 20 to the upper surface 2a of the slab with adhesive. With this configuration, the lower end of the vibration isolation support device 50 is fixed to the upper surface 2a of the floor slab 2, so that the vibration isolation support device 50 can elastically support the downward and upward displacement of the enlarged diameter portion 15.

[0042] Furthermore, the vibration isolation support device 50 of this embodiment allows for height adjustment of the floor material 4 simply by rotating the torque transmission unit 17 around the vertical axis Z with a screwdriver or the like, just as in the conventional method. Therefore, the vibration isolation support device 50 of this embodiment can dampen downward and upward vibrations acting on the floor material 4 on its own without significantly hindering the constructability of the conventional double-floor construction method.

[0043] (Second Embodiment) Figure 4 is an explanatory diagram of the lower end of the support leg 10 of the second embodiment. In this figure, Figure 4(A) is an exploded view, Figure 4(B) is a partial cross-sectional side view of the assembled Figure 4(A), Figure 4(C) is a partial cross-sectional side view of the lower end of the support leg 10 in use, and Figure 4(D) is a perspective view of the first vibration-damping rubber 20 of the second embodiment.

[0044] In Figure 4, the displacement transmission member 30 in the second embodiment is the upper cover 31. Furthermore, the first vibration-damping rubber 20 in the second embodiment is a rotating body centered on the vertical axis Z. For example, the first vibration-damping rubber 20 in the second embodiment may be an ellipsoid with its top and bottom surfaces cut off by horizontal planes.

[0045] In this embodiment, the upper support surface 21 may be located below the upper surface of the first vibration-damping rubber 20 by the thickness of the enlarged diameter portion 15 and the elastic packing 33. This allows the upper surface of the elastic packing 33 and the upper surface of the ridge portion 22 to be flush when the enlarged diameter portion 15 and the elastic packing 33 are placed on the upper support surface 21, resulting in a clean shape for the upper cover 31 without a recess 32. In this case, the adhesive 40 is applied to the area outside the ridge portion 22 in the area where the upper cover 31 contacts the upper surface of the first vibration-damping rubber 20. However, this is not the only option; the upper cover 31 in the second embodiment may have a recess 32, and the adhesive 40 may be applied to the upper cover 31. The configuration, usage method, and effects of the vibration-damping support device 50 of the second embodiment are the same as those of the first embodiment. Depending on the magnitude of the load that each support leg 10 receives from the floor material 4 and the strength of the first vibration-damping rubber 20, either the vibration-damping support device 50 of the first embodiment or the second embodiment may be selected, or a first vibration-damping rubber 20 and upper cover 31 with a different shape from those of the above embodiments may be used.

[0046] (Third embodiment) Figure 5 is a partial cross-sectional side view of the lower end of the support leg 10 of the third embodiment. In this figure, Figure 5(A) is an exploded view, Figure 5(B) is an assembled view of Figure 5(A), and Figure 5(C) is a partial cross-sectional side view of the lower end of the support leg 10 in use. Figure 5(D) is a partial cross-sectional side view of the lower end of the support leg 10 of the third embodiment, which has a vibration-damping support device 50 of a different shape from those in Figures 5(A) to (C). Figure 6 is a partial cross-sectional side view of the lower end of the support leg 10 of the third embodiment. Figure 6(A) shows the case when the downward displacement of the enlarged diameter portion 15 is elastically supported, and Figure 6(B) shows the case when the upward displacement of the enlarged diameter portion 15 is elastically supported.

[0047] In the third embodiment, the displacement transmission member 30 is the second vibration-damping rubber 35. The first vibration-damping rubber 20 is a rotating body about the vertical axis Z, and is preferably, for example, a prefix cone or a cylindrical shape. The outer shape of the second vibration-damping rubber 35 is also a rotating body centered on the vertical axis Z, and is preferably large enough to enclose the first vibration-damping rubber 20, with a sufficiently large length for the first hollow hole 50a and a thickness T of the vibration-damping rubber around the first hollow hole 50a. For example, the shape of the second vibration-damping rubber 35 is preferably cylindrical. However, it is not limited to this, and the shape of the second vibration-damping rubber 35 may be an ellipsoid with its top and bottom surfaces cut off by horizontal planes, as shown in Figure 5(D). Note that "thickness T of the vibration-damping rubber around the first hollow hole 50a" refers to "the thickness from the inner circumferential surface of the first hollow hole 50a to the outer circumferential surface of the second vibration-damping rubber 35". The first vibration-damping rubber 20 and the second vibration-damping rubber 35 are preferably made of the same elastic rubber, but they may be made of different elastic materials.

[0048] The second vibration-damping rubber 35, like the upper cover 31 of the first or second embodiment, has a first hollow hole 50a through which the cylindrical portion 14 of the support bolt 16 passes vertically when in use. The first hollow hole 50a is larger than the outer diameter of the cylindrical portion 14, but is set to a size that prevents the enlarged diameter portion 15 from passing through, allowing the cylindrical portion 14 to rotate freely around the vertical axis Z. Furthermore, an inner cavity 35a, which is cut out in the shape of the outer contour of the first vibration-damping rubber 20, is open on the lower surface of the second vibration-damping rubber 35. The lower end of the first hollow hole 50a opens into the upper end of the inner cavity 35a. The second vibration-damping rubber 35 has a lower support surface 50b around the opening of the first hollow hole 50a to the inner cavity 35a. With this configuration, in the vibration-damping support device 50 of the third embodiment, the cylindrical portion 14 is passed through the first hollow hole 50a from the inner cavity 35a, and the second vibration-damping rubber 35 is placed on top of the first vibration-damping rubber 20, thereby positioning the enlarged diameter portion 15 of the support bolt 16 on the upper support surface 21.

[0049] The first vibration-damping rubber 20 and the second vibration-damping rubber 35 are integrated with adhesive 40 with the enlarged diameter portion 15 placed on the upper support surface 21 of the first vibration-damping rubber 20. By bringing the upper support surface 21 close to or in close contact with the lower surface of the enlarged diameter portion 15, the downward displacement of the enlarged diameter portion 15 can be elastically supported. For example, the adhesive 40 may be applied to the outside of the ridge portion 22 of the first vibration-damping rubber 20 (the side surface of the first vibration-damping rubber 20 in this example), and the second vibration-damping rubber 35 may be placed over the first vibration-damping rubber 20. This allows the inner wall of the cavity 35a to be in close contact with the side surface of the first vibration-damping rubber 20, and the second vibration-damping rubber 35 and the first vibration-damping rubber 20 to be integrated. In the following description, the block of vibration-damping rubber integrated by bonding the first vibration-damping rubber 20 and the second vibration-damping rubber 35 with adhesive 40 will be called the "vibration-damping rubber base 51".

[0050] The second elastic modulus K2 with respect to the upward displacement of the vibration-damping rubber base 51 is preferably set to be the same as the first elastic modulus K1 with respect to the downward displacement of the vibration-damping rubber base 51. However, the present invention is not limited to this, and it is sufficient if they are substantially the same. In other words, as described above, the elastic modulus ratio K2 / K1 should be between 0.5 and 1.5. Furthermore, it is desirable that the linear elastic range X2 when the vibration-damping rubber base 51 is displaced upward and the linear elastic range X1 when the vibration-damping rubber base 51 is displaced downward are greater than the maximum amplitude of the double floor 1 (especially the floor material 4). The maximum amplitude of the floor material 4 is, for example, ±5 mm.

[0051] The thickness h1 from the lower support surface 50b to the upper surface of the second vibration-damping rubber 35 is preferably set to a length within the range where the first elastic modulus K1 and the second elastic modulus K2 are substantially the same (the range where the elastic modulus ratio K2 / K1 is 0.5 or more and 1.5 or less). In this embodiment, the vibration-damping rubber base 51 consists of a first vibration-damping rubber 20 and a second vibration-damping rubber 35, and the first vibration-damping rubber 20 and the second vibration-damping rubber 35 are integrated after the enlarged diameter portion 15 is installed on the upper support surface 21, so there is no need to pass the enlarged diameter portion 15 through the first hollow hole 50a. Therefore, in this embodiment, the thickness h1 of the vibration-damping rubber base 51 from the lower support surface 50b to the upper surface of the second vibration-damping rubber 35 can be set to be thicker than the rubber on the side into which the support bolt 116 of the floor base 150 of Patent Document 1 is inserted (the upper rubber in Figure 1(A)).

[0052] This allows the vibration-damping rubber base 51 to be provided such that when the lower support surface 50b is pushed up by the upwardly displaced enlarged diameter portion 15, the vibration-damping rubber between the lower support surface 50b and the upper surface of the second vibration-damping rubber 35 is less likely to deform. Therefore, the vibration-damping rubber base 51 of this embodiment can prevent the enlarged diameter portion 15 from coming loose from between the first vibration-damping rubber 20 and the second vibration-damping rubber 35.

[0053] Furthermore, in the third embodiment, the vibration-damping rubber base 51 has the second vibration-damping rubber 35 and the first vibration-damping rubber 20 integrated with adhesive 40, so the first vibration-damping rubber 20 and the second vibration-damping rubber 35 integrated with adhesive 40 function as a single block of vibration-damping rubber. When the upwardly displaced enlarged diameter portion 15 pushes up the lower support surface 50b of the second vibration-damping rubber 35, the side surface of the first vibration-damping rubber 20 is pulled upward against the inner wall of the inner cavity 35a, generating an elastic force acting as a tensile spring in the first vibration-damping rubber 20 and the second vibration-damping rubber 35. Therefore, the upward displacement of the enlarged diameter portion 15 is also transmitted to the first vibration-damping rubber 20. As a result, the vibration-damping rubber base 51 of the third embodiment can elastically support the upward displacement of the enlarged diameter portion 15.

[0054] With the above-described configuration, the vibration isolation support device 50 of the third embodiment allows the cylindrical portion 14 and the enlarged diameter portion 15 of the support bolt 16 to rotate freely around the vertical axis Z relative to the first vibration isolation rubber 20 before bonding to the slab upper surface 2a. Furthermore, after the vibration isolation support device 50 is bonded to the upper surface 2a of the slab, the downward and upward displacement of the enlarged diameter portion 15 can be elastically supported by the first vibration isolation rubber 20 and the second vibration isolation rubber 35. The configuration, usage method, and effects of the support legs 10 in the third embodiment are the same as those in the first or second embodiment.

[0055] (Fourth Embodiment) Figure 7 shows (A) a perspective view, (B) a cross-sectional side view, and (C) a bottom view of the vibration isolation support device 50 of the fourth embodiment. Figure 7(D) is a cross-sectional view taken along line CC in Figure 7(B). In Figure 7(A), the dashed-dot line represents the first hollow hole 50a, the double-dot line represents the hollow support hole 52, and the triple-dot line represents the notch 53.

[0056] In the fourth embodiment, the support legs 10 have one vibration-damping rubber base 51 for each support leg 10 as a vibration-damping support device 50. The vibration-damping rubber base 51 in the fourth embodiment is formed from a single block of vibration-damping rubber and has a hollow support hole 52, a notch 53, a first vibration-damping rubber 20, and a second vibration-damping rubber 35. The vibration-damping rubber base 51 is a rotating body about a vertical axis Z, and is preferably cylindrical in shape.

[0057] The hollow support hole 52 is located in the center of the vibration-damping rubber base 51 and is a cavity having an inner surface 52a that is close to or in close contact with the upper and lower surfaces of the enlarged diameter portion 15. This configuration allows the hollow support hole 52 to hold the enlarged diameter portion 15 so that it can rotate around the vertical axis Z. Grease may be applied to this inner surface 52a to facilitate the rotation of the enlarged diameter portion 15. It is preferable that the thickness h2 from the hollow support hole 52 of the vibration-damping rubber base 51 to the upper surface of the vibration-damping rubber base 51 is set to a length within the range where the first elastic modulus K1 and the second elastic modulus K2 are substantially the same (the range where the elastic modulus ratio K2 / K1 is 0.5 or more and 1.5 or less). From the center of the upper surface of the hollow support hole 52, a first hollow hole 50a extends vertically upward, through which the cylindrical portion 14 of the support bolt 16 passes. In this embodiment, as in the first embodiment, the first hollow hole 50a is set to be larger than the outer diameter of the cylindrical portion 14, so that the cylindrical portion 14 can rotate freely around the vertical axis Z.

[0058] In the fourth embodiment, the first vibration-damping rubber 20 is the portion of the vibration-damping rubber base 51 located below the hollow support hole 52. The first vibration-damping rubber 20 has a lower end surface 20a that can be adhered to the upper surface 2a of the slab, a notch 53 below the hollow support hole 52 that connects the hollow support hole 52 and the lower end surface 20a, and a hollow through hole 23. The hollow through hole 23 is a hole that penetrates the first vibration-damping rubber 20 vertically along the axis that coincides with the hollow through hole 14a of the support bolt 16. The notch 53 is configured to elastically expand below the hollow support hole 52, allowing the enlarged diameter portion 15 of the support bolt 16 to be inserted from below. In other words, the notch 53 extends upward from the lower end surface 20a of the vibration-damping rubber base 51 and is provided deep enough to reach the interior of the hollow support hole 52. The notch 53 also communicates with the outer circumferential surface of the vibration-damping rubber base 51 and the hollow through hole 23.

[0059] In this configuration, the first vibration-damping rubber 20 (the area below the hollow support hole 52 of the vibration-damping rubber base 51) is divided into multiple sections by the notches 53. The number of sections into which the first vibration-damping rubber 20 is divided can be any number, as long as the portion below the hollow support hole 52 is elastically expanded so that the enlarged diameter portion 15 of the support bolt 16 can be inserted from below. For example, it may be 3 to 8 sections. In the fourth embodiment, the second vibration-damping rubber 35 is located above the hollow support hole 52 which is integrally molded with the first vibration-damping rubber 20, and transmits the upward displacement of the enlarged diameter portion 15 to the first vibration-damping rubber 20.

[0060] Figure 8 is a partial cross-sectional side view of the support leg 10 of the fourth embodiment. In this diagram, Figure 8(A) is an exploded view, Figures 8(B) and 8(C) show the intermediate stages of the assembly process of Figure 8(A), Figure 8(D) is a completed assembly of Figure 8(A), and Figure 8(E) shows a partial cross-sectional side view of the lower end of the support leg 10 in use. With the configuration described above, the vibration-damping rubber base 51 of the fourth embodiment is provided so that a support bolt 16 can be inserted from below, as shown in Figures 7(C) and 7(D), by spreading out the first vibration-damping rubber 20 which is divided by the notch 53. When attaching the support bolt 16 to the vibration-damping rubber base 51, the cylindrical portion 14 of the support bolt 16 inserted from below is passed through the first hollow hole 50a from below until the enlarged diameter portion 15 fits into the hollow support hole 52.

[0061] The hollow through-hole 14a communicates with the notch 53 and the hollow through-hole 23 of the vibration-damping rubber base 51. As a result, as shown in Figure 8(E), the liquid adhesive 41 flows down from the upper end of the support bolt 16 through the hollow through-hole 14a, the hollow through-hole 23, and the notch 53 to the lower end of the vibration-damping rubber base 51, filling the inside of the hollow through-hole 23 and the notch 53 with the liquid adhesive 41. The liquid adhesive 41 adheres and integrates the multiple divided first vibration-damping rubber 20 pieces, so that the portion of the first vibration-damping rubber 20 functions as a single cylindrical block of vibration-damping rubber included in the lower end of the vibration-damping rubber base 51. Therefore, the first vibration-damping rubber 20 can elastically support the downward displacement of the enlarged diameter portion 15.

[0062] Furthermore, this configuration allows the liquid adhesive 41 that bonds the multiple divided first vibration-damping rubbers 20 together to also penetrate between the lower end surface 20a and the slab upper surface 2a through the hollow through-hole 23 and the notch 53, fixing the vibration-damping rubber base 51 to the slab upper surface 2a. In other words, with just one step of letting the liquid adhesive flow down from the upper end of the support bolt 16, the bonding of the lower end of the first vibration-damping rubber 20 to the slab upper surface 2a and the bonding of the multiple divided first vibration-damping rubbers 20 together can be completed simultaneously. Therefore, in the fourth embodiment, the support leg 10 does not require the process of bonding the first vibration-damping rubber 20 to other parts or to other first vibration-damping rubbers 20, thus shortening the manufacturing process of the vibration-damping support device 50 compared to the first to third embodiments. In this way, when the bottom surface of the vibration-damping rubber base 51 is fixed to the upper surface 2a of the floor slab 2, the vibration-damping support device 50 can elastically support both the downward and upward displacement of the enlarged diameter portion 15 with a single vibration-damping rubber base 51. In the fourth embodiment, the vibration-damping rubber base 51 may have a groove 24 on the bottom surface of the first vibration-damping rubber 20 that communicates with the hollow through hole 23, as in the first embodiment. In that case, the groove 24 also communicates with the notch 53.

[0063] The vibration-damping support device 50 of the fourth embodiment uses a vibration-damping rubber base 51 in which the first vibration-damping rubber 20 and the second vibration-damping rubber 35 are integrated, thus eliminating the need for the displacement transmission member 30, the adhesive 40 for bonding it, and the step of attaching the displacement transmission member 30 with the adhesive 40. Furthermore, the lower support surface 50b of the fourth embodiment is the upper surface of the hollow support hole 52 of the vibration-damping rubber base 51 and is made of vibration-damping rubber, thus eliminating the need for the elastic packing 33 that was required in the first and second embodiments. Therefore, the vibration-damping support device 50 of the fourth embodiment can reduce manufacturing costs because it requires fewer parts.

[0064] Furthermore, since there is a notch 53 from the lower end surface 20a of the vibration-damping rubber base 51 into the hollow support hole 52, the support bolt 16 can be inserted from the lower side of the vibration-damping rubber base 51 by pushing open the lower side of the vibration-damping rubber base 51. With this configuration, the vibration-damping rubber base 51 does not need to have a thin wall surface of vibration-damping rubber around the first hollow hole 50a in order to insert the support bolt 16 from above, so the thickness T of the vibration-damping rubber around the first hollow hole 50a can be made larger than that of the conventional support leg 110 (Figure 1(A)). In other words, the support leg 10 of the fourth embodiment has a structure that allows the enlarged diameter portion 15 to be installed in the hollow support hole 52 even if the thickness from the inner wall of the first hollow hole 50a to the outer surface of the vibration-damping rubber base 51 is made thick enough to elastically support the upward displacement of the enlarged diameter portion 15 at the lower support surface 50b. Therefore, in the fourth embodiment, the vibration isolation support device 50 does not require the first vibration isolation rubber 20 to be bonded to other vibration isolation rubbers or other parts with adhesive 40, and can elastically support the upward and downward displacement of the enlarged diameter portion 15 with just one vibration isolation rubber base 51. The configuration, usage method, and effects of the support leg 10 in the fourth embodiment are the same as in the first to third embodiments.

[0065] (Fifth embodiment) Figure 9 is an overall configuration diagram of the double floor 1 and the vibration-damping support legs 10 supporting it according to the fifth embodiment. The support leg 10 of the fifth embodiment is characterized in that the enlarged diameter portion 15 is larger in 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. In other words, in this example, an intermediate shaft 14b, whose upper end has a smaller diameter than the cylindrical portion 14, is fixed to the lower end of the cylindrical portion 14, and the enlarged diameter portion 15 can rotate freely around the vertical axis Z with respect to the cylindrical portion 14, with respect to the intermediate shaft 14b.

[0066] Furthermore, in this example, the inner surface 52a of the hollow support hole 52 is in direct contact with the upper and lower surfaces of the enlarged diameter portion 15. In the fifth embodiment, the upper and lower surfaces of the enlarged diameter portion 15 are integrally joined to the upper support surface 21 with an adhesive or the like, and the inner surface 52a of the hollow support hole 52 may grip the outer circumference of the enlarged diameter portion 15 so that it cannot rotate around its axis relative to the cylindrical portion 14.

[0067] With the configuration of the support leg 10 in the fifth 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 20 is fixed to the upper surface 2a of the slab. Furthermore, with this configuration, the upper support surface 21 and the lower support surface 50b of the hollow support hole 52 are in direct contact with the upper and lower surfaces of the enlarged diameter portion 15, so that the vibration-damping rubber base 51 can elastically support the enlarged diameter portion 15.

[0068] Figure 10 is a cross-sectional side view of the lower end of the support leg 10 of the fifth embodiment. Figure 10(A) shows the state before the injection of the liquid adhesive 41, and Figure 10(B) shows the state after the injection of the liquid adhesive 41. In the fifth embodiment, the hollow through-hole 14a of the support bolt 16 is provided coaxially in both the cylindrical portion 14 and the enlarged diameter portion 15. As a result, the liquid adhesive 41 injected into the hollow through-hole 14a of the cylindrical portion 14 penetrates through the hollow through-hole 14a of the enlarged diameter portion 15 into the hollow through-hole 23 of the first vibration-damping rubber 20. Furthermore, similar to the configuration described with reference to Figure 2 in the first embodiment, the screwed portion between the nut member 11 and the cylindrical portion 14 is fixed by the liquid adhesive 41, thereby preventing fluctuations in the gap between the floor slab 2 and the flooring material 4.

[0069] Figures 9 and 10 illustrate the case where the vibration-damping support device 50 of the support leg 10 in the fifth embodiment has the shape of the fourth embodiment, but it is not limited to this and may be any of the first to third embodiments. In this case, the upper surface of the enlarged diameter portion 15 is in direct contact with the lower support surface 50b on the lower surface of the displacement transmission member 30 or the lower surface of the elastic packing 33 of the first or second embodiment. 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 20 by adhesive or the like, and the ridge portion 22 of the first vibration-damping rubber 20 may grip the outer circumference of the enlarged diameter portion 15 with respect to the cylindrical portion 14 in a way that prevents rotation around its axis. The configuration, usage method, and effects of the support legs 10 in the fifth embodiment are the same as those in the first to fourth embodiments.

[0070] According to the configuration of the present invention described above, in the state of use, the support bolt 16 has a cylindrical portion 14 that extends vertically downward and has a male threaded portion 13 that screws into the female threaded portion 11a of the floor material support plate 12 fixed to the underside of the floor material. An enlarged diameter portion 15 is provided at the lower end of the cylindrical portion 14. Furthermore, the enlarged diameter portion 15 of the support bolt 16 is elastically supported against downward and upward displacement by a vibration-damping support device 50 fixed to the upper surface 2a of the floor slab 2. Therefore, since the vibration-damping support device 50 absorbs the vibration energy of the enlarged diameter portion 15, the support leg 10 of the present invention can support the floor material 4 while damping downward and upward vibrations acting on the floor material 4.

[0071] Furthermore, the cylindrical portion 14 of the support bolt 16 is held in a position to rotate around the vertical axis Z relative to the vibration isolation support device 50, and the male threaded portion 13 formed on the upper outer circumference is screwed into the female threaded portion 11a of the floor material support plate 12. With this configuration, the gap between the floor slab 2 and the floor material 4 can be adjusted by rotating the support bolt 16 around the vertical axis Z, while the male threaded portion 13 of the support bolt 16 is screwed into the female threaded portion 11a of the floor material support plate 12 fixed to the underside of the floor material.

[0072] Therefore, the support leg 10 of the present invention allows for easy height adjustment of the floor material 4, similar to the support leg 110 disclosed in Patent Document 1, making it possible to easily construct the double floor 1 without significantly hindering the constructability of conventional double floor construction methods.

[0073] Furthermore, the support leg 10 of the present invention can dampen downward and upward vibrations acting on the floor material 4 independently, without requiring the use of heavy vibration damping materials during construction. Therefore, the support leg 10 of the present invention makes it easier to construct a double floor 1 that can dampen both downward and upward vibrations compared to conventional support legs that use vibration damping materials during construction.

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

[0075] K1 is the first modulus of elasticity, K2 is the second modulus of elasticity, H Floor height, h1 Thickness of the vibration-damping rubber base from the lower support surface to the upper surface of the second vibration-damping rubber, h2 Thickness from the hollow support hole to the top surface of the vibration-damping rubber base, Thickness of vibration-damping rubber around the first hollow hole, X1,X2 Linear elastic range, Z vertical axis, 1. Double floor, 2. Floor slab, 2a. Top surface of slab, 4. Flooring material, 5. Base material, 6. Substrate material, 7. Floor finishing material, 8. Openings (or gaps), 10 Vibration-damping support legs (support legs), 11 Nut member, 11a Female threaded portion, 12 Floor support plate, 13 Male screw part, 14 cylindrical section, 14a hollow through hole, 14b intermediate shaft, 15 Expanded diameter part, 16 support bolts, 17 Torque transmission section (groove or projection), 20 First vibration-damping rubber, 20a Lower end surface, 21 Upper support surface, 22 Embankment, 23 Hollow through hole, 24 Recessed groove, 30 Displacement transmission member, 31 Top cover, 32 Recessed section, 33 Elastic packing, 35 Second vibration-damping rubber, 35a Inner cavity, 40 Adhesive, 41 Liquid adhesive, 42 Brush, 50 Vibration isolation support device, 50a First hollow hole, 50b Lower support surface, 51 Vibration-damping rubber base, 52 Hollow support hole, 52a Inner surface of hollow support hole, 53 cuts, 110 Conventional vibration-damping support legs, 102 Floor base, 115 Protruding part, 116 Support bolt, 150 ground base, 152 hole, 200 Conventional vibration-isolating floor support leg structure, 202 Floor base, 210 Conventional vibration-damping support legs, 220 Vibration damping material, 261 Upper metal plate, 262 Lower metal plate

Claims

1. A vibration-isolating support leg for a double floor consisting of a floor slab and flooring material positioned horizontally above it, A floor support plate fixed to the underside of the floor material and having a female threaded portion centered on a vertical axis, A support bolt having a cylindrical portion extending vertically downward and having a male threaded portion that screws into the female threaded portion on its upper outer circumference, and an enlarged diameter portion provided at the lower end of the cylindrical portion, The floor slab is fixed to the upper surface of the slab and includes a vibration-damping support device that elastically supports the downward and upward displacement of the enlarged diameter portion. The cylindrical portion of the support bolt is held so as to be rotatable about a vertical axis relative to the vibration-damping support device, in a vibration-damping support leg for a double floor.

2. The vibration-damping support device has an inner surface that is close to or in close contact with the upper and lower surfaces of the enlarged diameter portion and a hollow support hole that rotatably holds the enlarged diameter portion, A first vibration-damping rubber having a lower end surface that can be adhered to the upper surface of the slab, and a notch below the hollow support hole that connects the hollow support hole and the lower end surface, which elastically supports the downward displacement of the enlarged diameter portion, The device comprises a second vibration-damping rubber integrally molded with the first vibration-damping rubber, located above the hollow support hole, and transmitting the upward displacement of the enlarged diameter portion to the first vibration-damping rubber, The vibration-damping support leg for a double floor according to claim 1, wherein the notch is configured to elastically widen the portion below the hollow support hole so that the enlarged diameter portion can be inserted from below.

3. The vibration-damping support device includes a first vibration-damping rubber whose lower end surface can be adhered to the upper surface of the slab, and which elastically supports the downward displacement of the enlarged diameter portion. A vibration-isolating support leg for a double floor according to claim 1, comprising a displacement transmission member that is close to or in close contact with the upper surface of the enlarged diameter portion and adhered to the upper surface of the first vibration-isolating rubber, and transmits the upward displacement of the enlarged diameter portion to the first vibration-isolating rubber.

4. The enlarged diameter portion is a rotating body with a larger diameter than the cylindrical portion and centered on a vertical axis, and is integrally fixed to the lower end of the cylindrical portion. The first vibration-damping rubber has an upper support surface that is close to or in close contact with the lower surface of the enlarged diameter portion, and rotatably holds the enlarged diameter portion. The vibration-damping support leg for a double floor according to claim 3, wherein the displacement transmission member has a lower support surface that is close to or in close contact with the upper surface of the enlarged diameter portion, and rotatably holds the enlarged diameter portion.

5. The vibration-damping support leg for a double floor according to claim 4, wherein the displacement transmission member is a second vibration-damping rubber integrally joined to the first vibration-damping rubber on the outside of the enlarged diameter portion, or an upper cover.

6. The vibration-damping support leg for a double floor according to claim 1, wherein the support bolt has a torque transmission part for rotating the cylindrical part about a vertical axis.

7. The vibration-damping support leg for a double floor according to claim 6, wherein the torque transmission part is a groove or projection provided at the upper end of the cylindrical part.

8. The vibration-damping support leg for a double floor according to claim 1, wherein the enlarged diameter portion is a rotating body with a larger diameter than the cylindrical portion and centered on a vertical axis, and is integrally fixed to the lower end of the cylindrical portion.

9. The vibration-damping support leg for a double floor according to claim 1, wherein the enlarged diameter portion is larger in diameter than the cylindrical portion and is attached to the lower end of the cylindrical portion so as to be rotatable about its axis.

10. The support bolt has a hollow through-hole that penetrates vertically along its axis, The vibration-damping support leg for a double floor according to claim 2 or claim 3, wherein the first vibration-damping rubber is provided on the lower end surface and has a recessed groove that communicates with the hollow through hole.

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