JP2008286262A - Vibration control floor structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration control floor structure capable of easily adjusting its resonant frequency. <P>SOLUTION: The vibration control floor structure has a dynamic vibration absorber 1 attached to a horizontal member 2 constituting a floor structure 71. The dynamic vibration absorber 1 comprises: a fixing member 11 attached to the horizontal member 2; an arm material 21 which is supported by the fixing member 11 and swings as the horizontal member 2 vibrates; a mass body 31 attached to the arm material 21; and a damping material 41 for suppressing the vibration of the mass body 31. The mounting position of the mass body 31 is longitudinally adjustable on the arm material 21. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vibration-damping floor structure for a building such as a house or a condominium in which a dynamic vibration absorber is incorporated in a horizontal member constituting a floor structure.

  Conventionally, in a detached house, a floor structure using a large-span floor beam has been adopted for the purpose of expanding the degree of freedom in space design and constructing an open large space. However, in the floor structure employing such a large span floor beam, the natural frequency is lowered and the vibration damping performance is also deteriorated, so floor vibration represented by walking vibration becomes a problem. In order to reduce such floor vibration, measures such as using a floor beam having a beam section much larger than the structural calculation and setting the beam pitch finely are taken, but in this case, floor construction becomes complicated At the same time, there was a problem that material costs and construction costs were high.

  Therefore, in recent years, as disclosed in, for example, Patent Document 1 and Patent Document 2, a dynamic vibration absorber (dynamic damper) is attached to a floor beam or joists constituting a floor structure so as to suppress floor vibration. The proposed damping floor structure has been proposed. In such a vibration-damping floor structure, the resonance constant of the dynamic damper is tuned corresponding to the floor vibration that requires countermeasures by adjusting the spring constant and mass of the vibration-proof rubber in the dynamic damper. Then, when an impact is applied to the floor surface by walking or jumping and the floor beams and joists vibrate, the dynamic damper vibrates in the opposite phase and attenuates the floor vibration.

Japanese Patent Laid-Open No. 2004-3280 JP 2006-70494 A

  In general, the resonance frequency of the dynamic damper is tuned in advance according to the frequency of the floor vibration that requires countermeasures. However, when the dynamic damper is actually installed on the floor beam or joist, the resonance frequency of the dynamic damper is fine. Adjustment may be necessary. In the above vibration-damping floor structure, when adjusting such a resonance frequency, for example, a new dynamic damper having a different resonance frequency has to be replaced, so that the adjustment work is complicated and flexible according to the situation on the site. The response was difficult.

  Moreover, in the above-mentioned vibration-damping floor structure, the dynamic damper is exposed and attached so as to overhang from the floor beams and joists, so it is possible to install the dynamic damper in a place where it is difficult to secure a space in the underfloor space. There is a problem that the dynamic damper cannot easily interfere with other members. In addition, if the anti-vibration rubber part of the dynamic damper burns down during a fire, there is a risk that the mass part falls.

  In addition, for example, when a dynamic damper is attached to a floor beam or joist in advance at a factory, and this is transported to the work site, the overhanging dynamic damper interferes with it, leading to deterioration in transport efficiency, and the dynamic damper during transport. There was also a risk of damage due to collision. On the other hand, when installing heavy dynamic dampers on site, they were forced to carry out dangerous and time-consuming work.

  In addition, when attaching a dynamic damper to a floor beam or joist, there is often a need for some processing such as forming a mounting hole for the floor beam or joist, resulting in poor workability.

  Therefore, the present invention eliminates the above-mentioned problems, can easily adjust the resonance frequency, and incorporates a dynamic vibration absorber well in the horizontal member constituting the floor structure, so that the workability and safety can be improved. The purpose is to provide a vibration-damping floor structure that can improve the performance.

  In order to solve the above problems, the vibration damping floor structure of the present invention is obtained by attaching the dynamic vibration absorbers 1 to the horizontal members 2 constituting the floor structure 71. The fixing member 11 attached to the horizontal member 2, the arm member 21 supported by the fixing member 11 and swinging with the vibration of the horizontal member 2, and the mass body 31 attached to the arm member 21. And damping members 41 for suppressing vibrations of the mass bodies 31..., And the mass bodies 31. It is characterized by that. In addition, the mass bodies 31 can be attached to and detached from the arm member 21 and the total weight thereof can be adjusted.

  The arm member 21 is made of a rod having a screw portion 22, and a nut 61... That is screwed into the screw portion 22 by inserting the screw portion 22 of the rod into the through hole 32 of the mass body 31. The mass bodies 31 are attached by tightening. Further, the arm member 21 has an intermediate portion fixed to the fixing member 11 and mass bodies 31 attached to both end portions.

  Further, the horizontal member 2 is made of H-shaped steel, and the dynamic vibration absorber 1 is accommodated so as to be accommodated in a space 6 surrounded by the upper and lower flanges 3 and 4 and the web 5. The arm member 21 is arranged in the horizontal direction along the web 5 of the horizontal member 2, and the mass bodies 31 are arranged in the vertical direction along the web 5 of the horizontal member 2. .. Attenuating material 41 made of a viscoelastic material is interposed between the upper surface of the horizontal member 2 and the upper flange 3 of the horizontal member 2 and between the lower surface of the mass body 31 and the lower flange 4 of the horizontal member 2. Has been. Furthermore, the fixing member 11 is attached to the existing attachment holes 7 of the horizontal members 2.

  In the vibration damping floor structure of the present invention, the resonance frequency of the dynamic vibration absorber can be adjusted by changing the spring constant of the arm material only by adjusting the mounting position of the mass body in the dynamic vibration absorber incorporated in the horizontal member. . This makes it possible to easily adjust the resonance frequency of the dynamic vibration absorber without being forced to perform a complicated operation such as replacing a new dynamic vibration absorber with a different resonance frequency as in the prior art.

  In addition, the mass body can be attached to and detached from the arm material, and the total weight of the mass body can be adjusted, so that the resonance frequency of the dynamic vibration absorber can be adjusted in addition to the adjustment of the spring constant of the arm material. Can be done widely and flexibly.

  Also, if a rod having a screw part is used as an arm material, and this rod is inserted into the through hole of the mass body and tightened with a nut, the mass body can be attached to the rod. In addition, the attachment position of the mass body and the adjustment of the total weight can be adjusted, and the structure for adjusting the resonance frequency of the dynamic vibration absorber can be simplified.

  Furthermore, by fixing the middle part of the arm material to the fixing member and attaching the mass body to both ends of the arm material, the mass body on both sides can be vibrated in a balanced manner with the middle part of the arm material as a fulcrum and stable. The damping performance can be demonstrated.

  Furthermore, by incorporating the dynamic vibration absorber so that it fits in the space surrounded by the upper and lower flanges and web of the horizontal member made of H-shaped steel, the exposure and overhang of the dynamic vibration absorber are suppressed, and the dynamic vibration absorber is suppressed. It is possible to reduce space constraints and interference with other members associated with the construction of the vibration absorber, and to improve the workability by giving the floor structure a degree of freedom. In addition, the mass body can be prevented from falling during a fire, and safety can be improved. Further, for example, a dynamic vibration absorber can be assembled in advance in a horizontal member in a factory or the like, and this can be satisfactorily conveyed to the site, and the installation work of the dynamic vibration absorber can be performed safely and efficiently on the site.

  Furthermore, by attaching the dynamic vibration absorber using the existing mounting holes of the horizontal member, it is possible to eliminate the processing on the horizontal member side when attaching the dynamic vibration absorber and further improve the workability. Moreover, it is possible to easily attach a dynamic vibration absorber to a house after construction by using an existing attachment hole, and it is possible to flexibly cope with repairs and claims after construction.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The damping floor structure according to one embodiment of the present invention is applied to, for example, the upper floor of a steel-framed house, and a plurality of dynamic dampers (dynamic dampers) 1. Thus, the walking vibration generated mainly when walking on the floor surface is reduced.

  As shown in FIG. 5, the floor structure 71 is configured by assembling floor beams 2 made of, for example, six H-shaped steels. Four of these six floor beams 2... Have a beam span of about 6 m, and the remaining two have a beam span of about 3 m. The four vertical floor beams 2... End portions arranged in parallel with each other at a pitch of about 1 m are connected by the two horizontal floor beams 2 and 2. In addition, in this floor structure 71, although not shown, a beam connecting material and a brace material are provided at a necessary place. Further, a floor foundation panel made of ALC or the like (not shown) is installed on the floor structure 71, and a floor finishing material such as flooring is laid on the floor foundation panel.

  The four vertical floor beams 2... That are the horizontal members constituting the floor structure 71 are respectively attached with the dynamic vibration absorbers 1.

  Specifically, as shown in FIGS. 1 to 4, the dynamic vibration absorbers 1... Are arranged so as to be accommodated in a space 6 surrounded by the upper and lower flanges 3, 4 and the web 5 in each floor beam 2. Each is housed.

  Each dynamic vibration absorber 1... Is a beam middle plate 11 that is a fixed member attached to the floor beam 2... And an arm material that is supported by the beam middle plate 11 and swings with the vibration of the floor beam 2. A rod 21, a mass body 31 attached to the rod 21, and a damping member 41 that is interposed between the floor beam 2 and the mass body 31. It has.

  The intermediate beam plate 11 is fixed to the lower flange 4 of the floor beam 2 by extending in a horizontal direction from the lower end portion of the vertical piece 13 and a substantially rectangular vertical piece 13 fixed to the web 5 of the floor beam 2. A substantially rectangular horizontal piece 15, and a vertical piece 13 and a substantially rectangular support piece 19 that is attached across a substantially central portion of the horizontal piece 15. The vertical piece 13 is formed with four bolt insertion holes 12... Corresponding to the existing mounting holes 7... Formed in the web 5 of the floor beam 2 in advance. Further, two bolt insertion holes 14 and 14 are formed in the horizontal piece 15 corresponding to the existing mounting holes 7 and 7 formed in advance in the lower flange 4 of the floor beam 2. The mounting holes 7 of the floor beam 2 are bolt insertion holes used when a joining plate for joining another beam or the like orthogonal to the floor beam 2 is attached with a bolt. Further, an insertion hole 18 for inserting the rod 21 is formed in a substantially central portion of the support piece 19.

  The plate 11 in the beam aligns the bolt insertion holes 12 of the vertical piece 13 with the mounting holes 7 of the web 5, and the bolt insertion holes 14, 14 of the horizontal piece 15 and the mounting holes of the lower flange 4. 7 and 7 are installed in the space 6 of the floor beam 2 so as to coincide with each other, and in this state, the bolt insertion holes 12, 14... And the bolts 51. The nuts 52 are screwed and tightened to be fixed in the space 6 of the floor beam 2.

  The rod 21 functions as a spring material that supports the mass bodies 31..., And as shown in FIG. 2, the rod 21 is composed of all screw bolts having screw portions 22 over the entire length thereof, and has a substantially central portion in the length direction. In the state of being inserted into the insertion hole 18 of the support piece 19 of the beam middle plate 11, it is arranged in the lateral direction along the web 5 of the floor beam 2. The substantially central portion in the length direction of the rod 21 is fixed to the support piece 19 by welding or the like. The fixing of the rod 21 to the support piece 19 is not limited to welding, and may be performed, for example, by tightening a pair of nuts screwed to the rod 21.

  The mass body 31 is made of a substantially rectangular parallelepiped metal weight having a width of about 40 mm, a thickness of about 25 mm, and a height of 160 mm, for example, and its weight is about 3 kg. Through holes 32 and 32 through which the rod 21 is inserted are formed at substantially the center of these mass bodies 31. Then, two mass bodies 31 are attached to both ends of the rod 21 so as to fit in the space 6 of the floor beam 2. That is, two mass bodies 31, 31 are arranged in the vertical direction along the web 5 of the floor beam 2 so that the through holes 32, 32 are overlapped with each other, and the rod 21 is inserted into the through holes 32, 32. By inserting the end portion and tightening the nuts 61 and 61 screwed into the rod 21 so as to sandwich the two mass bodies 31 and 31, the two mass bodies 31 and 31 are attached to both ends of the rod 21. Each is attached. Note that gaps are secured between the mass bodies 31 and the upper and lower flanges 3 and 4 of the floor beam 2 and between the mass bodies 31 and the web 5 of the floor beam 2.

  In this mounted state, the mounting position of the mass body 31 in the longitudinal direction of the rod 21 can be adjusted by loosening the nuts 61 and moving the mass body 31 in the longitudinal direction of the rod 21. It has become. Also, the total weight of the mass bodies 31 can be adjusted by removing the nuts 61 and changing the number of mass bodies 31 attached to the rod 21 or replacing the mass bodies 31 with different weights. It has become.

  The damping member 41 is made of a plate-like viscoelastic body, and is between the upper surface of the mass body 31 and the upper flange 3 of the floor beam 2 and under the lower surface of the mass body 31 and the floor beam 2. They are respectively interposed between the flanges 4. Note that the attachment positions of the damping members 41 are not limited to the above, and may be interposed between the mass bodies 31 and the web 5 of the floor beam 2, for example.

  In the dynamic vibration absorber 1 configured in this way, the resonance frequency is tuned to, for example, around 15 Hz corresponding to walking vibration. It should be noted that the resonance frequency of the dynamic vibration absorber 1... May be appropriately tuned according to a frequency that requires a separate measure. For example, when used as a measure for reducing heavy floor impact noise, the resonance frequency of the dynamic vibration absorber 1... May be tuned to around 50 Hz. Further, by appropriately adjusting the mounting position and the total weight of the mass bodies 31... In each dynamic vibration absorber 1.

  In the vibration damping floor structure incorporating the dynamic vibration absorber 1 with the above configuration, the dynamic vibration absorber 1 with four mass bodies 31 is provided for each of the total four floor beams 2. Since one set is attached, a mass of about 50 kg is added as a whole.

  In this vibration-damping floor structure, it is not always necessary to attach the dynamic vibration absorber 1 to the floor beam 2... The horizontal members constituting the floor structure 71 other than the floor beam 2. The dynamic vibration absorber 1... May be attached to a bridge beam or the like that has little structural influence. In this case, the dynamic vibration absorbers 1... Can be accurately arranged at locations where vibration countermeasures are prioritized without giving structural addition to the floor structure 71.

  In the actual construction of the vibration-damping floor structure, if a dynamic vibration absorber 1 is attached to the floor beam 2 in advance in a factory, etc., and this is transported to the site and assembled, dynamic vibration absorption The vessel 1 can be easily and safely incorporated into the floor structure 71. Alternatively, after the floor beams 2 are assembled and the floor structure 71 is constructed, the dynamic vibration absorbers 1 may be attached to the floor beams 2. Even in this case, since each of the mass bodies 31... Used for the dynamic vibration absorbers 1... Is about 3 kg, which is relatively light, handling is easy and safety can be ensured.

  In this way, when the dynamic vibration absorber 1... Is constructed, it may be necessary to finely adjust the resonance frequency of the dynamic vibration absorber 1. In adjusting the resonance frequency, the spring constant of the rod 21 is changed by loosening the nut 61 fixed to the rod 21 and adjusting the mounting position of the mass body 31 in the longitudinal direction of the rod 21. I try to let them. Also, the nuts 61 are removed, the number of mass bodies 31 attached to the rod 21 is changed, or the mass bodies 31 are replaced with different mass bodies 31 to adjust the total weight of the mass bodies 31. This also makes it possible to adjust the resonance frequency of the dynamic vibration absorber 1. Therefore, it is not necessary to replace the entire dynamic vibration absorber as in the prior art, and the resonance frequency can be easily adjusted.

  In the vibration-damping floor structure having the above configuration, when walking vibration when walking on the floor surface propagates to the floor structure 71, the vibration of the floor beam 2. The mass bodies 31 attached to both ends vibrate in the vertical direction. As a result, the dynamic vibration absorber 1... Resonates with the floor beam 2... And the vibration is quickly absorbed by the damping material 41. If the resonance frequency of the dynamic vibration absorber 1 is tuned in accordance with the heavy floor impact sound, the heavy floor impact sound propagated to the lower floor can be reduced.

  The present invention is not limited to the above embodiment, and it is needless to say that many modifications and changes can be made to the above embodiment within the scope of the present invention. For example, in the above-described embodiment, a rod made of all screw bolts is used as the arm material, but a rod having a screw portion in part may be used, and a band plate material having no screw portion is used instead of the rod. May be.

  Further, in the above embodiment, the substantially central portion of the arm material in the longitudinal direction is fixed to the fixing member, and the mass body is attached to both ends of the arm material. However, one end of the arm material is fixed to the fixing member. A mass body may be attached to the other end of the arm material.

  Furthermore, the fixing member does not necessarily have to be attached using an existing attachment hole, and a new attachment hole may be provided in the horizontal member and attached to the attachment hole.

  Further, the damping material 41... Is not limited to a viscoelastic body, and a magnetic damper 91. The magnetic damper 91 includes a conductor plate 92 that is bolted to the mass body 31... And a magnet support 93 attached to the floor beam 2. The conductor plate 92 is inserted. And when the conductor plate 92 vibrates with the vibration of the mass body 31..., An eddy current is generated in the conductor plate 92 and a braking force opposite to the vibration is generated. Is supposed to suppress.

  Furthermore, in the above embodiment, the dynamic vibration absorber 1 is provided in one space 6 sandwiched between the webs 5 of the floor beam 2, but as shown in FIGS. 7 and 8, the space on both sides sandwiching the webs 5 is provided. 6 and 6 may be provided with dynamic vibration absorbers 1 and 1 to adjust the total weight.

  Moreover, the vibration-damping floor structure of the present invention may be applied not only to the floor of a steel-frame house but also to the floor of a wooden house. In this case, as shown in FIG. 9, the dynamic vibration absorbers 1... May be attached to the side surfaces of the wooden beam 80.

It is a perspective view near the dynamic vibration absorber of the floor beam of the vibration-damping floor structure according to one embodiment of the present invention. It is the exploded perspective view similarly. It is the side view similarly. It is the transverse cross section similarly. It is a top view of the floor structure of a damping floor structure. It is a perspective view which shows the attachment state of a magnetic damper. It is a cross-sectional view showing an embodiment in which a dynamic vibration absorber is attached to both sides of a floor beam web. It is a top view of the floor structure of the damping floor structure similarly. It is a perspective view near the dynamic vibration absorber of a wooden beam.

Explanation of symbols

  1 ・ ・ Dynamic vibration absorber 2 、 ・ Horizontal material (floor beam) 3 ・ ・ Upper flange 4 ・ ・ Lower flange 5 ・ ・ Web, 6 ・ ・ Space, 7 ・ ・ Mounting hole, 11 ・ ・ Fixed Member (plate in the beam), 21 ... Arm material (rod), 22 ... Screw part, 31 ... Mass body, 32 ... Through hole, 41 ... Damping material, 61 ... Nut, 71 ... Floor structure body

Claims (7)

It is a vibration-damping floor structure in which a dynamic vibration absorber (1) is attached to a horizontal member (2) constituting the floor structure (71), wherein the dynamic vibration absorber (1) is the horizontal member. The fixing member (11) attached to (2), the arm member (21) supported by the fixing member (11) and swinging with the vibration of the horizontal member (2), and the arm member (21) A mass body (31) attached to the mass body (31), and a damping material (41) for suppressing vibration of the mass body (31). A vibration-damping floor structure characterized in that the mounting position in the longitudinal direction can be adjusted with respect to the arm member (21). 2. The damping floor structure according to claim 1, wherein the mass body (31) is detachable from the arm member (21) and the total weight thereof is adjustable. The arm member (21) is composed of a rod having a screw portion (22), and the screw portion (22) of the rod is inserted into the through hole (32) of the mass body (31). The damping floor structure according to claim 1 or 2, wherein the mass body (31) is attached by tightening a nut (61) that is screwed into the screw portion (22). The arm member (21) is fixed to the fixing member (11) at an intermediate portion thereof, and the mass bodies (31) are attached to both end portions, respectively. Damping floor structure. The horizontal member (2) is made of H-shaped steel, and the dynamic vibration absorber (1) is placed in a space (6) surrounded by the upper and lower flanges (3), (4) and the web (5). The vibration-damping floor structure according to any one of claims 1 to 4, which is accommodated. The arm member (21) is disposed in a horizontal direction along the web (5) of the horizontal member (2), and the mass body (31) is a web (5) of the horizontal member (2). ) In the vertical direction, between the upper surface of these mass bodies (31), and the upper flange (3) of the horizontal member (2), and the lower surface of the mass body (31), 6. The damping floor structure according to claim 5, wherein the damping material (41) made of a viscoelastic body is interposed between the lower flange (4) of the horizontal member (2). The damping floor structure according to any one of claims 1 to 6, wherein the fixing member (11) is attached to an existing mounting hole (7) of the horizontal member (2).