JP2013217150A - Supporting leg - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a supporting leg capable of preventing its shank from wobbling.SOLUTION: A supporting leg 10 is provided on a floor concrete skeleton 2 and supports a floor surface material 3. The supporting leg 10 includes: a pedestal 20 which has a hole 21 formed on its top face and is elastically deformable; a shank 30 inserted in the hole 21, extending in a substantially vertical direction, and provided with a screw thread 31 formed on its outer peripheral surface; and a fastening member 50 screwed on a part exposed from the hole 21 of the shank 30. An extended part 22 extended toward the inside is formed in the upper part of the hole 21, and a collar part 32 spreading outward is integrally formed in a part lower than the extended part 22 of the shank 30. The extended part 22 is held by the fastening member 50 and the collar part 32 by fastening the fastening member 50.

Description

  The present invention relates to a support leg. Specifically, the present invention relates to a support leg that is used for a dry double floor and is provided on a floor frame to support a floor material.

  Conventionally, vibrations of building facilities, subways, etc. may be transmitted as solid sound from the floor surface through the column and floor frames. Therefore, in order to reduce this solid sound, for example, a dry double floor is adopted. The dry double floor is composed of support legs arranged in a lattice pattern on the surface of the floor frame and a floor surface material placed on the support legs.

Here, the support legs are a rubber pedestal installed on the floor frame, a shaft portion attached to the upper surface of the rubber pedestal and extending in a substantially vertical direction, and a support member attached to the upper end side of the shaft portion. (See Patent Document 1).
A non-through hole extending in a substantially vertical direction is formed on the upper surface of the vibration isolating rubber.
A flange portion extending laterally is screwed to the shaft portion, and the lower end side of the shaft portion is inserted into a non-through hole of the vibration isolating rubber, and the flange portion is attached to the upper surface of the rubber base through a washer. It is in contact.

  According to this support leg, the rubber pedestal is elastically deformed to absorb the vibration, so that the vibration transmitted through the floor frame can be prevented from being radiated from the floor surface material as a solid sound.

Japanese Patent No. 2539240

  However, since the shaft portion is attached to the rubber pedestal by inserting the shaft portion into the non-through hole, there is a possibility that the shaft portion may become loose due to vibration.

  An object of this invention is to provide the support leg which can prevent the shakiness of a shaft part.

(For example, see below)
The support legs according to claim 1 (for example, support legs 10 and 10A described later) are provided on a floor frame (for example, a floor concrete frame 2 described later) and a floor surface material (for example, a floor material described below). 3) a support leg for supporting a pedestal (for example, a pedestal 20 to be described later) having a hole (for example, a later-described hole 21) formed on the upper surface and elastically deformable, and being substantially vertically inserted into the hole. A shaft portion (for example, a shaft portion 30 to be described later) having a thread (for example, a thread portion 31 to be described later) engraved on the outer peripheral surface and a portion exposed from the hole of the shaft portion. And an extended portion (for example, an extended portion 22 described later) extending inwardly is formed in the upper portion of the hole. In the portion below the extension portion of the shaft portion, a flange portion (for example, described later) that expands outward. Formed part 32) is integrally by being tightened the fastening member, characterized by clamping the extending portion between the and the member with the fastening flange part.

  The support leg according to claim 2, wherein the hole has a depth between the lower surface of the flange portion and the bottom surface of the hole by sandwiching the extension portion between the fastening member and the flange portion. It is characterized in that it is set so that a gap is formed in the gap.

According to this invention, the tightening member is tightened so that the extending portion is sandwiched between the tightening member and the flange portion, and a gap is provided between the lower surface of the flange portion and the bottom surface of the hole.
Therefore, since the shaft portion can be integrated with the pedestal by tightening the tightening member, the shaft portion can be prevented from wobbling due to vibration.
Further, since the shaft portion is supported on the pedestal via the extension portion, when the vertical load acting on the shaft portion is small, this load is supported on the pedestal via the extension portion. Therefore, since the vibration of the floor frame is transmitted in the order of the bottom surface of the pedestal, the extension portion, and the shaft portion, the vibration can be greatly attenuated by this extension portion, so that the solid sound can be reduced.
On the other hand, when the load is large, the load of the shaft portion is evenly distributed on the upper surface of the pedestal via the tightening member. As a result, the upper portion of the pedestal is slightly lowered as a whole, and the lower surface of the collar portion comes into contact with the bottom surface of the hole, so that this load is supported by the pedestal via the bottom surface of the hole. Therefore, even if the pedestal is formed of soft rubber, the feeling of walking on the floor material can be improved.

  The support leg according to claim 3 is characterized in that a damping member (for example, a damping member 24 described later) for damping vibration is interposed between the hole and the lower end side of the shaft portion. .

  According to this invention, since the damping member is interposed between the hole and the lower end side of the shaft portion, it is possible to further attenuate a sudden impact and vibration of the shaft portion.

  According to the present invention, the fastening member is fastened so that the extending portion is sandwiched between the fastening member and the flange portion, and a gap is provided between the lower end surface of the shaft portion and the flange portion and the bottom surface of the hole. Therefore, since the shaft portion can be integrated with the pedestal by tightening the tightening member, the shaft portion can be prevented from wobbling due to vibration. Further, since the shaft portion is supported on the pedestal via the extension portion, when the vertical load acting on the shaft portion is small, this load is supported on the pedestal via the extension portion. Therefore, since the vibration of the floor frame is transmitted in the order of the bottom surface of the pedestal, the extension portion, and the shaft portion, the vibration can be greatly attenuated by this extension portion, so that the solid sound can be reduced. On the other hand, when the load is large, the load of the shaft portion is evenly distributed on the upper surface of the pedestal via the tightening member. As a result, the entire upper portion of the pedestal is slightly lowered and the lower surface of the shaft portion comes into contact with the bottom surface of the hole, so that this load is supported by the pedestal via the bottom surface of the hole. Therefore, even if the pedestal is formed of soft rubber, the feeling of walking on the floor material can be improved.

It is sectional drawing which shows the dry-type double floor structure to which the support leg which concerns on 1st Embodiment of this invention was applied. It is sectional drawing which shows the state in which the big load acted on the support leg which concerns on the said embodiment. It is a measurement result of the dynamic spring constant with respect to the load which acts on the axial part of the support leg which concerns on the said embodiment. It is sectional drawing which shows the dry-type double floor structure to which the support leg which concerns on 2nd Embodiment of this invention was applied.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description of the embodiments, the same constituent elements are denoted by the same reference numerals, and the description thereof is omitted or simplified.
[First Embodiment]
FIG. 1 is a cross-sectional view showing a dry double floor structure 1 to which a support leg 10 according to a first embodiment of the present invention is applied.
The dry double floor structure 1 includes support legs 10 arranged in a grid pattern on the upper surface of a floor concrete frame 2 as a floor frame, and a floor material 3 supported by the support legs 10.
The support leg 10 includes a pedestal 20 having a hole 21 formed on the upper surface, a shaft portion 30 that is inserted into the hole 21 and extends in a substantially vertical direction, and a thread 31 is engraved on the outer peripheral surface, and a shaft portion 30. A support member 40 that is screwed to support the floor member 3 and a tightening member 50 that is screwed to a portion exposed from the hole 21 of the shaft portion 30 are provided.

The base 20 is made of elastically deformable rubber.
The tightening member 50 includes a washer 51 through which the shaft portion 30 is inserted, and a nut 52 that is positioned above the washer 51 and screwed into the shaft portion 30. The washer 51 is disposed so as to cover the entire upper surface of the base 20.

  The bottom surface 21 </ b> A of the hole 21 is widened, and an extension portion 22 extending inward is formed at the top of the hole 21.

A flange portion 32 that extends outward is integrally formed at the lower end portion of the shaft portion 30, that is, at a portion below the extending portion 22. The flange portion 32 is located at a portion where the bottom of the hole 21 is widened.
By tightening the nut 52, the extension portion 22 is sandwiched between the washer 51 and the flange portion 32, and a gap with a predetermined width S is formed between the lower surface of the shaft portion 30 and the flange portion 32 and the bottom surface 21 </ b> A of the hole 21. Is done.
That is, the depth of the hole 21 is set such that a gap having a predetermined width S is formed between the lower surface of the shaft portion 30 and the flange portion 32 and the bottom surface 21 </ b> A of the hole 21 by tightening the washer 51. Yes.

  The floor material 3 is placed on the support member 40. The height of the floor covering 3 from the floor concrete housing 2 can be adjusted by rotating the support member 40 and adjusting the height appropriately.

In the above support leg 10, since the shaft portion 30 is supported on the base 20 via the extending portion 22, when the vertical load acting on the shaft portion 30 is small, as shown by the arrow in FIG. The pedestal 20 is supported via the extension 22.
On the other hand, when the load acting on the shaft portion 30 is large, the load of the shaft portion 30 is evenly distributed over the entire upper surface of the pedestal 20 by the washer 51 as shown in FIG. As a result, the upper part of the pedestal 20 is slightly lowered as a whole, and the lower surface of the flange portion 32 comes into contact with the bottom surface 21 </ b> A of the hole 21. Therefore, this load is supported by the pedestal 20 via the flange portion 32 and the bottom surface 21A of the hole 21 as indicated by an arrow in FIG.

FIG. 3 is a measurement result of a dynamic spring constant with respect to a load acting on the shaft portion 30.
The load acting on the shaft portion 30 is evenly distributed on the upper surface of the pedestal 20 by the washer 51. Therefore, when the washer 51 is provided, a dynamic spring for the same load is applied in a predetermined range (here, a range from 5.5 kg to 24.6 kg) when the load acting on the shaft portion 30 is not provided. The constant is getting smaller.

It has been found that the dry double floor structure 1 can be prevented from resonating when the resonance frequency of the dry double floor structure 1 is lower than the peak frequency of the transmitted vibration.
The resonance frequency f (Hz) is expressed by the following equation (1), where the dynamic spring constant k (N / m) and the mass of the portion above the support leg 10 are m (kg).

From equation (1), it can be seen that the resonance frequency f decreases as the dynamic spring constant decreases.
Therefore, when the load acting on the shaft portion 30 is within the predetermined range described above, by providing the washer 51, the dynamic spring constant becomes smaller than when no washer is provided, and thus the resonance frequency is lowered. As a result, the dry double floor structure 1 can be prevented from resonating and vibration can be greatly reduced.

According to this embodiment, there are the following effects.
(1) The nut 52 is tightened so that the extended portion 22 is sandwiched between the washer 51 and the flange portion 32, and a gap is provided between the lower surface of the shaft portion 30 and the flange portion 32 and the bottom surface 21 </ b> A of the hole 21.
Therefore, since the shaft part 30 can be integrated with the base 20 by tightening the nut 52, wobbling of the shaft part 30 can be prevented.

  Further, since the shaft portion 30 is supported on the pedestal 20 via the extending portion 22, when the vertical load acting on the shaft portion 30 is small, this load is supported on the pedestal via the extending portion 22. Further, the vibration of the floor concrete frame 2 is transmitted in the order of the bottom surface of the pedestal 20, the extension portion 22, and the shaft portion 30. Since the extending portion 22 extends inward at the upper portion of the hole 21, vibration can be greatly attenuated by the extending portion 22, so that solid sound can be reduced.

  On the other hand, when the load is large, the load of the shaft portion 30 is evenly distributed on the upper surface of the base 20 via the washer 51. As a result, the upper part of the pedestal 20 is slightly lowered as a whole, and the lower surface of the flange 32 abuts against the bottom surface 21A of the hole 21, so that this load is supported by the pedestal 20 via the bottom surface 21A of the hole 21. . Therefore, even if the base 20 is made of soft rubber, the feeling of walking on the floor material 3 can be improved.

[Second Embodiment]
FIG. 4 is a cross-sectional view showing a dry double floor structure 1 to which a support leg 10A according to a second embodiment of the present invention is applied.
In the present embodiment, a through hole 23 reaching the bottom surface of the base 20 is formed in the bottom surface 21 </ b> A of the hole 21.

Further, the shaft portion 30 is further extended downward from the flange portion 32, and this extended portion is an extension portion 33. The extension 33 is inserted through the through hole 23.
A gap having a predetermined width S ′ is formed between the lower end surface of the extension portion 33 and the upper surface of the floor concrete frame 2. This S ′ is larger than S.

  Between the extension portion 33 of the shaft portion 30 and the through hole 23, a rubber damping member 24 for damping vibration is interposed.

According to the present embodiment, in addition to the above-described effect (1), the following effect can be obtained.
(2) Since the damping member 24 is interposed between the hole 21 and the extension portion 33 which is the lower end side of the shaft portion 30, it is possible to further attenuate a sudden impact and vibration of the shaft portion 30.

  It should be noted that the present invention is not limited to the above-described embodiment, and modifications, improvements, etc. within a scope that can achieve the object of the present invention are included in the present invention.

1 ... Dry double floor structure 2 ... Floor concrete frame (floor frame)
DESCRIPTION OF SYMBOLS 3 ... Floor material 10, 10A ... Supporting leg 20 ... Base 21 ... Hole 21A ... Bottom 22 ... Extension part 23 ... Through-hole 24 ... Damping member 30 ... Shaft part 31 ... Thread 32 ... Gutter 33 ... Extension part 40 ... Supporting member 50 ... Tightening member 51 ... Washer 52 ... Nut

Claims (3)

A support leg provided on the floor frame for supporting the flooring material,
A pedestal having a hole formed in the upper surface and elastically deformable;
A shaft portion that is inserted into the hole and extends in a substantially vertical direction, and a thread is engraved on the outer peripheral surface;
A fastening member screwed into a portion exposed from the hole of the shaft portion,
In the upper part of the hole, an extending part extending inward is formed,
A flange portion that extends toward the outside is integrally formed in a portion below the extension portion of the shaft portion,
A support leg, wherein the extension member is clamped between the tightening member and the flange portion when the tightening member is tightened.   The depth of the hole is such that a gap is formed between the bottom surface of the flange and the bottom surface of the hole by sandwiching the upper edge of the hole between the tightening member and the flange. The support leg according to claim 1, wherein the support leg is set.   The support leg according to claim 1, wherein a damping member that attenuates vibration is interposed between the hole and the lower end side of the shaft portion.

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