JP2003013591A - Rubber vibration isolator in support leg for double floor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the air spring action of air in an internal space caused by instantaneous strong impact from a floor, and the consequent propagation of vibration and sound. SOLUTION: In double floor structure, a floor board material 2 is placed on a floor foundation bed 1 through a support leg 3 having the rubber vibration isolator 3 abutting on the floor foundation bed, and a leg part 5 erected on the rubber vibration isolator. The rubber vibration isolator 4 comprises an abutting board part 11 of turned-over bowl shape with the peripheral edge part 8 abutting on the floor foundation bed 1, and a leg part insert-through part disposed on the upper side of the abutting board part 11 of turned-over bowl shape. The rubber vibration isolator is provided with at least one air escape hole 13 between an internal space formed by the abutting board part of turned-over bowl shape and the floor foundation bed, and an opposed external space, and/or an air escape cutout groove 13 provided at a part of a contact part of the abutting board part 11 of turned-over bowl shape with the floor foundation bed 1.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double floor structure in which a floor plate is placed on a floor base via support legs, and particularly to a floor base on the support legs. Related to anti-vibration rubber. 2. Description of the Related Art In a general double floor structure, as shown in a schematic side view of FIG. 3, a floor plate 2 is placed above a floor base 1 such as a concrete slab at a predetermined height. The supporting legs 3 are interposed in order to support the supporting legs, and the height of the supporting legs 3 is usually several tens mm to several hundred mm. The support leg 3 has a rubber vibration isolator 4 in contact with the floor base, and a metal or hard resin leg 5 that penetrates a lower end portion of the upper hole of the rubber rubber isolator 4, or further includes a rubber leg. A floor plate receiving portion 6 having a hole through which the upper end portion 3 is inserted is disposed, and the floor plate material 2 is mounted thereon. As the vibration damping rubber 4, a high molecular compound having ordinary rubber elasticity is employed, and for example, various rubbers such as butadiene-styrene rubber, butyl rubber and nitrile rubber are available. The lower part of the vibration isolating rubber 4 is a peripheral part 8 with the floor base 1.
In many cases, the inner space 7 is formed between the floor base 1 and the floor base 1 so as to suppress vibration and sound propagation.
When a strong impact is momentarily applied from the floor, the internal space 7
Is compressed and further expanded by the reaction, so that a so-called air spring action is repeated, and vibration and sound due to the air spring action are easily transmitted to the surroundings. [0004] For example, Japanese Patent No. 2761541 discloses a "floor base structure" in which a space portion is formed inside an elastic body, an air escape hole communicating the space portion with the outside is formed, and the height of the elastic body is further increased. Although it is disclosed that the buckling is facilitated by thinning a part of the thickness in the width direction, the elastic body is easily deformed by an impact, which is not satisfactory from the viewpoint of suppressing the sinking of the floor. . Japanese Patent Application Laid-Open No. 2000
Japanese Patent Application Laid-Open No. 240240/1992 discloses that a large number of downward projections are arranged on a portion of an elastic support in contact with a floor base. It is not enough to control. The present invention is an improvement of the above prior art, and provides an anti-vibration rubber for a double-floor support leg in which the air spring action of the internal space based on the impact from the floor and the vibration caused thereby are suppressed as much as possible. The purpose is to: According to the present invention, a floor plate is mounted on a floor base via supporting legs having a vibration-proof rubber in contact with the floor base and legs standing on the vibration-proof rubber. In the double-floor structure to be provided, the vibration-isolating rubber is composed of a prone bowl-shaped contact part that contacts the peripheral part to the floor base, and a leg insertion part disposed above the prone bowl-shaped contact part, At least one air escape hole is provided between an inner space formed by the bowl-shaped contact part and the floor base and an opposing external space, and / or It is a vibration-proof rubber in a double-floor support leg provided with a cutout groove for air escape in at least a part of the contact portion. In the present invention, the floorboard 2 shown in FIG. 3 does not specify the structure and material, but it is, for example, a wooden veneer or a wooden veneer attached to the upper surface. Wood-based plywood (Plywood cuts many slits from the lower side to the upper side to improve soundproofing and anti-vibration performance). Elastic plate, such as resin, rubber, etc. under the woody plywood A body, a sound insulation sheet, or a mat-like molded body in which organic and inorganic fibers are entangled are laminated and integrated to form a floor plate material body, and further, a base plate under the floor plate material body, for example, a particle board, a gypsum board, Generally, a board such as a lightweight cement board, which is hardly bent even when subjected to a local impact from above, is formed. Of course, a relatively soft material such as a linoleic tile is disposed on the uppermost layer, the above-mentioned wood plywood is converted into a particle board, a hard resin board, or the like, or the above-mentioned buffer board is made of a multi-layer structure of different materials. , Various floorboard materials can be adopted. FIG. 1 is a view showing one embodiment (embodiment) of a vibration damping rubber according to the present invention, and FIG.
FIG. 1B is a front view. As described above, the leg 5 of the support leg 3
Is formed of metal or hard resin. As the anti-vibration rubber 4, various types of rubber compounds having normal rubber elasticity, for example, butadiene-styrene rubber, butyl rubber, nitrile rubber, chloroprene rubber, urethane rubber, and silicone rubber can be used. The hardness of the rubber may be appropriately designed. However, in order to minimize the sinking of the floor against impact from the floor, it is preferable that the hardness be equal to or higher than Hs45 ° based on the test method of JIS K6301. For relaxation, it is preferable to set Hs to 90 ° or less. Hs is more preferably in the range of 55 ° to 90 °. Although the size of the vibration isolation rubber 4 is not specified, the diameter (spread in the horizontal direction) is about 30 mm to 50 mm, and the total height is about 20 mm to 60 mm. A leg insertion portion 10 having a hole 9 into which the leg portion 5 is inserted is disposed above the vibration isolating rubber 4, and a lower edge of the vibration isolating rubber 4 is in contact with the floor base 1 at a peripheral portion 8. The lie-down bowl-shaped contact part 11 on which 7 is formed is arranged. The lying bowl-shaped contact part 11 itself exhibits a spring action such as a leaf spring, and attenuates and attenuates shocks and vibrations (sounds) transmitted from above through the legs 5. Further, the face-down bowl-shaped contact part 11 is provided with an air escape hole 13 that communicates the internal space 7 with the external space 12 facing the internal space 7. Although one example of the air escape hole 13 is shown in the drawing, a plurality of holes can be provided. The diameter of the hole is appropriately designed, for example, 2 mm to 10 mm. Conventionally, when a strong impact is instantaneously applied from the floor, the air in the internal space is compressed and expanded by the reaction thereof, and a so-called air spring action is repeated. Although there was a problem that sound was transmitted to the surroundings, the provision of the air escape hole 13 enabled the escape of air between the internal space 7 and the external space 12, thereby suppressing the adverse effect. it can. FIGS. 2A and 2B are diagrams showing another embodiment (embodiment) of the anti-vibration rubber in the double-floor support leg of the present invention. FIG. 2A is a front view, and FIG. 2B is a bottom view. It is. The material and size of the vibration isolating rubber are the same as in the embodiment. The face-down bowl-shaped contact part 11 'is attached to the vibration-proof rubber 4'.
And a leg insertion portion 10 ′ having a leg insertion hole 9 ′ arranged on the upper side of the lying bowl-shaped contact surface 11 ′. One or more notched grooves 13 ′ for air escape that communicate between the internal space 7 and the external space 12 facing the inner space 7 ′ are provided in a peripheral edge portion 8 ′ of the face-down bowl-shaped contact part 11 ′ that contacts the floor base 1. It is preferable to arrange a plurality of notch grooves 13 ′. In the drawing, an example in which four grooves are arranged is shown. The cross-sectional shape of the cutout groove 13 'for air escape is not specified, and various shapes such as a circular cross-section and a square shape can be adopted. The size of the groove, that is, the diameter or the width of the groove is appropriately designed. For example, 2 mm to 10 mm. Also in the present embodiment, as in the embodiment, it is very effective in suppressing vibration and sound due to the action of the air spring. Although not shown, the air escape hole 13 in the embodiment and the air escape cutout groove 13 'in the embodiment can be provided side by side. EXAMPLE [Example 1 and Comparative Example] A double floor having the following structure was manufactured on a floor base. Floorboard: A wooden board / wooden plywood / fibrous mat molding / particle board was laminated to form a floorboard. The total thickness of the floorboard is 40 mm. Support leg: The leg portion was formed of a synthetic resin, and rubber having a rubber hardness Hs of 90 ° was used as the vibration isolating rubber. The external shape of the vibration isolating rubber is the same as that shown in FIG. 1, and the outer diameter (diameter of the protruding bowl-shaped contact part) is 40 mm and the height is 30 mm. In Example 1, one air escape hole having a diameter of 5 mm was arranged in the prone bowl-shaped contact part as shown in the embodiment, and no air hole was provided in the comparative example. In each case, the total length (height) of the support legs is about 100 mm. A floor impact sound insulation performance test (weight impact sound insulation performance) was performed on the double floor of each of the configurations of Example 1 and Comparative Example based on JIS A 1418-2. On the other hand, in the case of Example 1, the sound insulation was improved by 2 dB at 125 Hz and 1 dB or more at 250 Hz. This is because, in the comparative example, the air in the internal space of the vibration isolating rubber caused an air spring action, which caused vibration, whereas in Example 1, the air escape hole was provided to suppress the vibration. . [Embodiment 2] A double-floor structure similar to that of the embodiment 1 and a similar vibration-proof rubber structure, except that the vibration-proof rubber is provided on a protruding bowl-shaped contact part as shown in the embodiment for air escape. 4 notches
The ones that were arranged were adopted. The width and height of the groove are 5 mm each. As in Example 1, an impact sound insulation performance test (weight impact sound insulation performance) was carried out in comparison with the comparative example. The result of Example 2 was 2 dB or more at 125 Hz, compared to that of Comparative Example. At 250 Hz, a 3 dB improvement in sound insulation was observed. This is also due to the fact that the notched groove for air escape suppresses the air spring action and the vibration due to it, as in the first embodiment. According to the present invention, the provision of the air escape hole and the air escape cutout groove in the vibration isolating rubber allows the air in the internal space to act as an air spring due to an instantaneous strong impact from the floor. ,
This has the effect of suppressing vibration and sound propagation.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing one embodiment of a vibration damping rubber according to the present invention, FIG. 1A is a side sectional view, and FIG. 1B is a front view. FIG. 2 is a view showing another embodiment of the vibration-proof rubber according to the present invention, wherein FIG. 2A is a front view and FIG. 2B is a bottom view. FIG. 3 is a side view showing a general double floor structure. [Description of Signs] 1 Floor base 2 Floor plate 3 Support leg 4, 4 'Anti-vibration rubber 5 Leg 7 Internal space 8, 8' Perimeter 9, 9 'Leg insertion hole 10, 10' Leg insertion 11 , 11 'face-down bowl-shaped contact part 12 external space 13 air escape hole 13' notch groove for air escape

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Yoshitaka Sugata             1510 Central Glass, Oguchicho, Matsusaka City, Mie Prefecture             Glass Laboratory Co., Ltd.

Claims (1)

Claims: 1. A double mounting method for mounting a floor plate material on a floor base via support legs having vibration isolating rubber in contact with the floor base and legs standing on the vibration isolating rubber. In the floor structure, the anti-vibration rubber includes:
An interior formed by a laid-down bowl-shaped contact part and a floor base, comprising a laid-down bowl-shaped contact part for contacting the periphery with the floor base, and a leg insertion part disposed above the folded-cup-shaped contact part. Providing at least one air escape hole between the space and the external space facing the space,
An anti-vibration rubber for a double-floor support leg, wherein a cut-out groove for air escape is provided in at least a part of a contact portion of a prone bowl-shaped contact part with a floor base.