JP4465842B2 - Support structure of floor support horizontal member - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a support structure for a floor support horizontal member, and more particularly, a floor support that quickly attenuates unpleasant vibration in a vertical direction of a floor surface generated in a relatively small building such as a house due to a person's walking impact force. The present invention relates to a support structure for a horizontal member.
[0002]
[Prior art]
Many floors of buildings have structures that are supported by horizontal members such as beams or joists arranged at predetermined intervals, and the stress level of horizontal members caused by vertical loads such as floor loads and load loads It is designed so that the amount of deflection is less than the allowable value. However, even if the static structural performance is satisfactory, it is difficult to predict the dynamic performance reliably. Especially when the support interval of the horizontal member is large, the vibration attenuation in the vertical direction is small. May cause discomfort.
[0003]
As means for solving this problem, Japanese Patent Laid-Open Nos. 05-026294, 05-118281, 05-302643, 09-067877, 09-328858, 10-2522553, (1) A method of absorbing vibration energy by giving an additional mass that vibrates separately from the floor is disclosed, and Japanese Patent Laid-Open No. 09-177220 discloses (2) a buffer in addition to a joint that bears a vertical load. A method of obtaining a vibration absorbing effect by providing a material is disclosed.
[0004]
[Problems to be solved by the invention]
In the method (1), a special device is required, and it is necessary to adjust the device by grasping the vibration property of the floor body in advance. In particular, when the ratio of the fluctuation amount of the loaded load to the mass of the floor main body is large as in a detached house, the vibration property is expected to change, and the damping effect may be reduced.
[0005]
On the other hand, in the method (2), it is considered that the vibration absorption effect is reduced when the joint rigidity of the joint bearing the vertical load is high. Adjustment of the joint rigidity so as to achieve both the load support function and the vibration damping function is not possible. Considering the production cost, it is difficult.
In view of the problems of these prior arts, the present invention does not require troublesome work such as adjustment for changes in vibration properties of the floor main body and adjustment of the rigidity of the support portion, and is stable only by providing light parts with low production costs. An object of the present invention is to provide a support structure for a floor-supporting horizontal member capable of obtaining a vibration damping effect.
[0006]
[Means for Solving the Problems]
The object has been achieved by the present invention as follows.
(1) In the support structure of a floor support horizontal member that receives the vertical load applied to the horizontal member that supports the floor of the building by the first component fixed to the support member, the second component fixed to the support member includes: A floor-supporting horizontal structure characterized in that the horizontal member is always in surface contact with the side surface of the vertical portion of the horizontal member , and the horizontal member is configured to receive a sliding frictional resistance from the second part each time it vibrates. Support structure for the frame.
[0007]
(2) In the support structure of the floor support horizontal member that receives the vertical load applied to the horizontal member that supports the floor of the building by the first component fixed to the support member, the second component fixed to the support member includes: There the vertical section always face contact through a viscoelastic material on the side surfaces of the horizontal members, each of the vibration is the horizontal members, that is configured to receive a viscoelastic frictional resistance by the viscoelastic body Supporting structure for floor support horizontal material .
[0008]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a three-dimensional schematic diagram (a: overall image, b: support portion) showing an example of the present invention (1). As shown in the drawing, in the present invention, the vertical load applied to the horizontal member 3 that supports the floor body (comprising the finishing material 1 and the base material 2) of the building is received by the first component 5 fixed to the supporting material 4. In the support structure of the floor support horizontal member, the second component 6 fixed to the support member 4 is always in surface contact with the side surface of the vertical part 32 of the horizontal member 3. In addition, the support material 4 is fixed to a foundation or a housing (not shown) and does not move.
[0009]
Since the present invention is configured as described above, the horizontal member 3 receives a sliding frictional resistance from the second component 6 that is always in surface contact with the horizontal member 3 every time it vibrates, thereby obtaining a stable vibration damping effect. be able to. In the present invention, as is apparent from the configuration, troublesome work such as adjustment of the vibration property change of the floor main body and adjustment of the rigidity of the support portion is not required, and the conventional support structure using the first component has a production cost. It is only necessary to provide a cheap second component.
[0010]
The material applied to each member is not particularly limited, but in the embodiment shown in FIG.
Finishing material = flooring material base material = structural plywood horizontal frame material = lightweight C-shaped steel support material advantageous in terms of price, strength and rigidity = wooden body difference (can be a beam)
1st part = plane T-shaped hardware 2nd part = L-shaped cross-section hardware In this support structure, the T horizontal line part and the T vertical line part of the first part 5 are used as a fixed part and a loading part, respectively. The fixed portion is fixed at the position of the counterbore 41 provided on the upper surface of the support material 4 so that the loading portion projects horizontally from the support material 4, and the supported portion of the horizontal member 3 is supported on the loaded loading portion. By placing 31 (the upper flange of the C-shaped steel), a portion that supports the vertically downward load generated by the floor structure's own weight and the loaded load is configured.
[0011]
Furthermore, either the L vertical line portion or the L horizontal line portion of the second component 6 is the free portion 61 and the other is the fixed portion 62, and the surface of the free portion 61 on the outer folding side is the vertical portion of the horizontal member 3. A portion for damping vibration is configured by fixing the fixed portion 62 to the support member 4 after positioning so as to always contact the side surface of the 32 (C-shaped steel web).
As a means for fixing the fixed parts of the first and second parts to the support member 4, any of nails, screws, bolts, adhesives and the like can be preferably used.
[0012]
Further, as in the example of FIG. 1, when the horizontal member 3 has an asymmetrical cross section such as a C-shaped steel cross section, the vertical portion 32 is on the side where the shear center of the horizontal member 3 is located during vibration ( Since there is a tendency to be biased toward the outer side of the C bay, it is preferable to arrange the second component 6 on the side where the shear center is located.
Moreover, when using several C-section steel as the horizontal member 3, as shown in FIG. 2, two adjacent C-sections face each other on the same side (C bay outer side or C bay inner side) surface. It is preferable to arrange them in a horizontal direction because vibrations in the horizontal direction can be suppressed.
[0013]
On the other hand, when using the thing of a symmetrical cross section as the horizontal member 3, you may arrange | position the 2nd components 6 on both sides of the vertical part 32, as shown in FIG.
Further, in the present invention (2), as shown in FIG. 4, in the present invention (1), the second component 6 is always brought into surface contact with the lateral surface of the horizontal member 3 through the viscoelastic body 7. A support structure was adopted. The viscoelastic body 7 is interposed between the surface of the free part 61 of the second part 6 on the outer folding side and the side surface of the vertical part 32 of the horizontal member 3.
[0014]
According to this support structure, the horizontal member 3 is subjected to viscoelastic frictional resistance due to shear deformation (displacement deformation) of the viscoelastic body 7 that is always in surface contact with the horizontal member 3 every time it vibrates. can get.
The viscoelastic body 7 has a high internal damping performance, has adhesiveness on the front and back surfaces, and has a material that adheres to adhesive even if shear deformation in the thickness direction occurs to some extent, for example, butyl rubber or foamed resin as a base material. A tape-shaped molded article having an adhesive layer coated thereon can be preferably used.
[0015]
Note that the second part has a stronger sliding frictional resistance or viscoelastic frictional resistance to the horizontal member when the vertical distance from the fixing position of the first part is set as large as possible. Since it acts and the vibration damping effect is further improved, it is even more preferable.
[0016]
【Example】
In the floor structure of the form shown in FIG. 1 (a), the horizontal support member is vibrated with respect to the floor specimens (first to fourth examples) shown in FIGS. 5 (a) to 8 (a). Experiments were conducted to investigate the damping performance. In this vibration experiment, the floor specimen was vibrated by applying a constant impact force to the vibration point (= center position in the floor) with a drop device, and the vertical displacement of the vibration point was measured. . The experimental results are shown in FIG. 5 (b) to FIG. 8 (b) as vibration attenuation waveform diagrams.
[0017]
The horizontal member is C-shaped steel with length (support interval) = 3.64 m, web height = 235 mm, flange width = 50 mm, lip (flange end bent portion) width = 20 mm, plate thickness = 1.2 mm The support material was a wooden trunk, and horizontal members were arranged at 303 mm intervals in the longitudinal direction of the support material. The floor body was formed by adhering a finishing material (= flooring material) to a base material (= 15 mm thick structural plywood) that was tapped with C-shaped steel.
[0018]
In the first example (FIG. 5 (a)), the upper flange of the C-shaped steel (horizontal member 3) is supported by a flat T-shaped metal fixture (first component 5) fixed to the support material 4. This corresponds to a comparative example not belonging to the present invention. In this first example, the attenuation constant was as small as about 2.0% (FIG. 5 (b)), and uncomfortable feeling was felt when walking on the floor.
In the second example (FIG. 6 (a)), the lower flange of the C-shaped steel (horizontal member 3) is screwed to a wooden square 8 having a cross section of 30 × 40 (mm) with a tapping screw in the first example, and By fixing the square member to the support member 4 and fixing the lower part of the C-shaped steel, it corresponds to a comparative example not belonging to the present invention. In this second example, the attenuation constant was about 2.8% (FIG. 6 (b)), which was slightly improved compared to the first example, but was not sufficient, and discomfort during walking on the floor was not reduced so much.
[0019]
The third example (FIG. 7 (a)) is the same as that in the first example, and the surface on either the L vertical line side or the L horizontal line side of the L-shaped metal part (second part 6) is a C-shaped steel. Example of the present invention (1), in which the bottom surface of the C bay outside of the (horizontal member 3) is always brought into contact with the lower end position, and the other side of the metal fitting is nailed to the support member 4. It corresponds to. In this third example, the attenuation constant was as large as about 3.5% (FIG. 7 (b)), an improvement in performance was observed, and discomfort during walking on the floor was significantly reduced.
[0020]
In the fourth example (FIG. 8 (a)), in the third example, a viscoelastic body 7 (in this case, butyl rubber tape is applied) is attached to the surface of the second component 6 on the side opposite to the C-shaped steel web surface. And is interposed between the C-shaped steel web surface and corresponds to the embodiment of the present invention (2). In this fourth example, the attenuation constant was further increased to about 7.7% (FIG. 8 (b)), and further improvement in performance was recognized, and discomfort during walking on the floor was resolved.
[0021]
【The invention's effect】
According to the present invention, there is no need for troublesome work such as adjustment of the vibration properties of the floor main body, adjustment of the rigidity of the support portion, and a stable vibration damping effect can be obtained simply by providing a light part with low production costs. Excellent effect.
[Brief description of the drawings]
FIG. 1 is a three-dimensional schematic diagram showing an example of the present invention (1).
FIG. 2 is a three-dimensional schematic diagram showing a preferred arrangement of C-shaped steel horizontal members.
FIG. 3 is a three-dimensional schematic diagram showing an example of the arrangement of second parts with respect to a horizontal member having a symmetric cross section.
FIG. 4 is a three-dimensional schematic diagram showing an example of the present invention (2).
FIG. 5 is a horizontal member support structure diagram (a) and a vibration damping waveform diagram (b) of the first example (comparative example).
FIG. 6 is a horizontal member support structure diagram (a) and a vibration damping waveform diagram (b) of a second example (comparative example).
FIG. 7 is a horizontal member support structure diagram (a) and a vibration damping waveform diagram (b) of a third example (example).
FIG. 8 is a horizontal member support structure diagram (a) and a vibration damping waveform diagram (b) of a fourth example (example).
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Finishing material 2 Base material 3 Horizontal material 4 Support material 5 1st component 6 2nd component 7 Viscoelastic body 8 Wooden square material
31 Supported parts
32 Vertical section
41 Zaborori
61 Free part
62 Fixed part

Claims (2)

In a support structure of a floor support horizontal member that receives a vertical load applied to a horizontal member that supports a floor of a building by a first component fixed to the support member, the second component fixed to the support member includes the horizontal member. A floor-supporting horizontal member characterized in that the horizontal member is always in surface contact with the side surface of the vertical part of the material , and the horizontal member is configured to receive sliding frictional resistance from the second component each time vibration occurs. Support structure. In the support structure of the floor supporting horizontal member for receiving a first component of a fixed vertical load applied to the horizontal member to a support member for supporting the floor of the building, the second component is the horizontal bridging fixed to said support member It is characterized in that it is always in surface contact via a viscoelastic body on the side of the vertical part of the material , and the horizontal member is configured to receive viscoelastic frictional resistance by the viscoelastic body each time it vibrates. Support structure for floor support horizontal members.

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