JP4732909B2 - Floor structure - Google Patents

Description

  The present invention relates to a floor structure of a building structure such as a general house and an apartment house (apartment, apartment).

  In general homes and the like, vibration is generated when an impact is caused by jumping on the floor or descending from a platform, which causes problems such as unpleasant noise and unpleasant vibration. In particular, in multi-storey detached houses and apartment houses, vibrations and impact sounds generated in the floors of living rooms and corridors are directly transmitted to the lower floor, which is a serious noise for residents on the lower floor. There is a case.

  Therefore, various measures have been taken in the past in order to suppress vibrations and impact sounds generated on the floors of ordinary houses and the like. For example, as a measure against heavy floor impact sounds (63 Hz band), light weight with high mass and high rigidity. There is known a floor structure in which a floor panel made of cellular concrete (hereinafter also referred to as “ALC”) is adopted as a flooring material. In this floor structure, both end portions of an ALC floor panel are placed on the floor beam of the building structure, and a plurality of floor panels are arranged in parallel so as to be adjacent to each other. The ALC used here is mainly composed of calcareous raw materials and siliceous materials and foamed by adding a foaming agent or mixed with pre-made bubbles to make it porous, and then autoclaved. It is a lightweight cellular concrete obtained.

  Further, for example, in Patent Documents 1 to 3, a spring member fixed to a base portion of a bracket (mounting member) and elastically supported by the spring member in order to reduce vibration and impact sound generated on the floor of a building such as a house. There is disclosed a dynamic damper which is composed of a mass member and is installed on a floor supporting member such as a beam or joist to support the flooring. When the floor vibrates at a specific frequency due to vibration input, the dynamic damper attenuates and suppresses floor vibration by causing the mass member to resonate with the floor via the spring action of the spring member. it can. The resonance frequency of the dynamic damper is basically determined by the mass of the mass member and the spring constant of the spring member, and is tuned according to the frequency of vibration and impact sound to be reduced.

  Further, for example, in Patent Document 4, in order to make it possible to effectively prevent floor impact noise by optimizing the weight of the dynamic damper according to the weight of the floor on which the dynamic damper is to be installed. It is disclosed that the weight / floor weight of the dynamic damper is 0.02 to 0.5.

  By the way, the sound insulation performance of the floor of a building structure is generally evaluated based on JIS A1418-2 “Measurement method of floor impact sound insulation performance of a building / Part 2: Method using standard weight impact source”. In this evaluation, a method of increasing the floor weight (vibrating body weight) is effective as a measure for improving the sound insulation performance of the heavy floor impact sound to the level of the level class LH65 to LH70. However, when this method is adopted, as the weight of the floor increases, it is necessary to increase the size of the frame and foundation or to reinforce it steadily. It becomes. Therefore, there is a limit to the method for increasing the floor weight.

  In view of this, the present applicant has proposed a floor structure in which good sound insulation performance can be obtained with a slight increase in floor weight (Japanese Patent Application No. 2004-207789). That is, in this floor structure, at least one floor beam composed of a vertical beam and a horizontal beam is used as a minimum unit, and the horizontal beam extends with respect to the minimum beam unit. Two rows along a position in which the floor material composed of a plurality of floor panels arranged in parallel in the direction and the side of the floor material on the side of the longitudinal beam is divided into four equal parts and approximately ¼ from both ends of the side And a damping device composed of spring members and mass members installed at four or more positions so that the center of gravity is substantially along each row. According to this floor structure, the heavy floor impact sound can be reduced by 5 dB (the level grade can be increased by one rank).

By the way, in this floor structure, in order to ensure the effect of reducing Δ5 dB of heavy floor impact sound, the total mass of mass members constituting each dynamic damper is usually about 15 to 18% of the floor weight (vibration body weight). A degree is required. Therefore, the number of installed dynamic dampers increases, which tends to increase costs.
JP 2000-355994 A JP 2003-278409 A Japanese Patent Laid-Open No. 2004-3280 JP-A-4-213650

  This invention is made | formed in view of the said actual condition, and makes it the subject which should be solved to provide the floor structure which can reduce a heavy floor impact sound efficiently, suppressing the increase in floor weight. It is.

The present invention for solving the above-mentioned problems is directed to a floor beam composed of at least one beam with a beam unit assembled in a rectangular shape by a vertical beam and a horizontal beam as a minimum unit, and the horizontal beam with respect to the beam unit of the minimum unit. A floor member comprising a plurality of floor panels arranged in parallel in a direction in which the two members extend, a mounting member having a plurality of mounting fixing portions disposed at a predetermined distance, a spring member fixed to the mounting member, and the spring member A floor structure comprising: a mass member elastically supported; and a plurality of dynamic dampers installed with the mounting fixing portions fixed to the floor material at a plurality of locations, wherein the dynamic damper is In the two straight lines parallel to the horizontal beam passing through a position that is ¼ of the both ends of the side of the floor material and being ¼ from both ends of the side , the one attachment on one straight line While the fixed part is located, the other straight line The other of the fixing lug is characterized in that it is fixed so as to be positioned.

  In the floor structure of the present invention, when the floor material (floor panel) is subjected to vibrations such as jumping or descending from the platform, the vibration is generated by the floor material. When vibrating at a specific frequency, the mass member of the dynamic damper resonates with the floor material through the spring action of the spring member, so that the vibration of the floor material is attenuated and suppressed. Thereby, the heavy floor impact sound (63 Hz band) generated on the floor is efficiently reduced. In particular, in the floor structure of the present invention, the ratio of the total mass of the mass member to the floor weight (vibrator weight) can be reduced by installing the dynamic damper as described above with respect to the floor material. It becomes. Therefore, according to the floor structure of the present invention, it is possible to efficiently reduce heavy floor impact sound while suppressing an increase in floor weight.

  In the present invention, precast concrete, wood-based panel material, or the like is employed as the floor panel used for the floor material. In particular, a floor panel made of concrete having a high rigidity and a high mass is suitable for measures against heavy floor impact noise, and among them, a floor panel made of lightweight cellular concrete (ALC) is preferable.

  A dynamic damper installed on a flooring material includes a mounting member having a plurality of mounting fixing portions arranged at a predetermined distance, a spring member fixed to the mounting member, and a mass elastically supported by the spring member. It consists of members. In this dynamic damper, each side of the floor beam on the vertical beam side is divided into four equal parts so that each mounting fixing part is positioned on two straight lines passing through positions that are 1/4 from both ends of the side and parallel to the horizontal beam. It is fixed to. In this case, the dynamic damper may be configured such that a part of the contact surface of each mounting fixing portion that contacts the flooring is positioned on the straight line, but the width direction of each floor panel (the direction in which the cross beam extends) It is preferable to install it at the center of The dynamic damper is preferably fixed so that each mounting fixing part is positioned on both straight lines so as to straddle the center part in the direction in which the vertical beam of the floor material extends. You may fix so that an attachment fixing | fixed part may be located.

  In the present invention, a dynamic damper using a rubber elastic body as the spring member can be suitably employed. In this case, a compression type that elastically supports the mass member so that the rubber elastic body compressively deforms, or a shear type that elastically supports both ends of the mass member so that the rubber elastic body shears and deforms, etc. Can do. In particular, in the present invention, a dynamic damper is used that is sheared so that the rubber elastic body undergoes shear deformation, and the rubber elastic body has a characteristic that the value of tan δ is 0.01 or more and less than 0.1. It is desirable to form. That is, the amplitude dependence is reduced by adopting a shear arrangement, and the creep fluctuation is reduced by setting the tan δ of the rubber elastic body to 0.01 or more and less than 0.1, and the temperature dependence, secular fluctuation, amplitude dependence, etc. This is because the sound insulation performance with good weight floor impact sound can be exhibited in a more stable state.

  As a preferred aspect of the present invention, a pair of mounting members each having a mounting fixing portion and spaced apart from each other, a columnar mass member disposed between the pair of mounting members, and a pair of mountings It is possible to suitably employ a dynamic damper that includes elastic support members that are respectively provided on the members and elastically support both ends of the mass member. The dynamic damper is preferably set so as to have a plurality of types of resonance frequencies in the range above and below the floor eigenvalue. In this way, it is possible to provide a range of frequencies for the purpose of reducing heavy floor impact sound, so it is possible to absorb variations in floor eigenvalues due to differences in structural properties, etc. The sound reduction function can be exhibited more reliably.

  According to the floor structure of the present invention, the dynamic damper includes a mounting member having a plurality of mounting and fixing portions arranged at a predetermined distance, and divides the side on the vertical beam side of the flooring into four equal parts. The ratio of the total mass of the mass member to the floor weight (vibration body weight) because each mounting and fixing part is fixed on two straight lines that pass through 1/4 position from both ends and parallel to the cross beam. Can be reduced. Thereby, a heavy floor impact sound can be efficiently reduced while suppressing an increase in the floor weight.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a bottom view of the floor structure according to the present embodiment, showing a state where the upper floor is viewed from the back side, and FIG. 2 shows a dynamic damper used in the floor structure according to the present embodiment. It is a figure, (a) is the top view, (b) is the front view.

  The floor structure of the present embodiment includes a floor beam 1 composed of one beam concavity configured as a minimum unit assembled in a rectangular shape by vertical beams 1a, 1b and horizontal beams 1c, 1d, and a horizontal beam 1c, A pair of mounting members 31, 31 each having a mounting fixing portion 31a, a pair of columnar mass members 32, and a pair of flooring materials 2 made of six ALC floor panels 21-26 arranged in parallel in the extending direction 1d. Are composed of six dynamic dampers 3,..., 3 installed on the flooring 2.

  The floor beam 1 is made of H-shaped steel, and is assembled in a rectangular shape by two vertical beams 1a and 1b and two horizontal beams 1c and 1d connecting the ends of the vertical beams 1a and 1b. In this floor beam 1, the core-to-core dimension of the longitudinal beams 1a, 1b is 2750 mm, and the core-to-core dimension of the horizontal beams 1c, 1d is 1750 mm.

  As the floor panels 21 to 26, long plate-like products made of lightweight cellular concrete (ALC) are employed. The floor panels 21 to 26 are arranged in parallel in the direction in which the horizontal beams 1c and 1d extend in a state where both ends in the longitudinal direction are placed on the horizontal beams 1c and 1d of the floor beam 1. The two floor panels 21 and 26 on both sides have a length of 1750 mm, a width of 310 mm, and a thickness of 100 mm. The four floor panels 22 to 25 in the central part have a length of 1750 mm, a width of 500 mm, and a thickness of 100 mm.

  As shown in FIGS. 2 (a) and 2 (b), the dynamic dampers 3,..., 3 have a pair of mounting members 31 and 31 each having a mounting fixing portion 31a and 31a and spaced apart from each other. A columnar mass member 32 disposed between the attachment members 31, 31 and a pair of elastic support members 33, 33 provided on the pair of attachment members 31, 31, respectively, for elastically supporting both ends of the mass member 32, It is composed of Each of the mounting members 31, 31 is formed by bending a single iron plate at a substantially right angle to form an L-shaped cross section. The mounting fixing portions 31a, 31a are formed in a rectangular shape, and the mounting fixing portion 31a. , 31a and rectangular rising portions 31c and 31c rising from one end. Mounting holes 31b and 31b through which mounting bolts (not shown) are inserted are provided in the central portions of the mounting fixing portions 31a and 31a.

  The mass member 32 is formed in a long cylindrical shape having a constant diameter from an iron-based metal, and is set to have a predetermined mass (7.5 kg). The elastic support members 33 and 33 are made of rubber elastic bodies 33a and 33a formed in a columnar shape, and a metal plate 33b formed in a disk shape and vulcanized and bonded to one end surface of the rubber elastic bodies 33a and 33a. 33b, connecting bolts 33c, 33c whose heads are embedded in rubber elastic bodies 33a, 33a and screw portions project from insertion holes formed in the central part of the metal plates 33b, 33b, and connecting bolts 33c, 33c The nuts 33d and 33d are screwed. The rubber elastic bodies 33a and 33a are made of a natural rubber (NR) rubber material, and have characteristics in which the value of tan δ is 0.01 or more and less than 0.1, and the creep fluctuation is small. It has good sag resistance.

  The elastic support members 33 and 33 are provided integrally with the attachment members 31 and 31 by vulcanizing and bonding one end surfaces of the rubber elastic bodies 33a and 33a to the rising portions 31c and 31c. The elastic support members 33 and 33 are connected to the masses by tightening the nuts 33d and 33d after the screw portions of the connecting bolts 33c and 33c are screwed into the screw holes provided on both end surfaces of the mass member 32, respectively. The member 32 is connected. Thereby, both ends of the mass member 32 are elastically supported by the elastic support members 33 and 33. The resonance frequency of the dynamic dampers 3,... 3 is based on the mass of the mass member 32 and the spring constant in the shear direction of the rubber elastic bodies 33a, 33a. Is tuned to 52 Hz).

  As shown in FIG. 1, six dynamic dampers 3,..., 3 are installed one by one in the center in the width direction with respect to the two floor panels 23, 24 in the center, and 2 on both sides thereof. Two of the floor panels 22 and 25 are installed at the center in the width direction. In the case of the present embodiment, each of the dynamic dampers 3,... 3 crosses the central part in the direction in which the longitudinal beams 1 a and 1 b of the flooring 2 extend so that the mounting fixing parts 31 a and 31 a The side (length L) on the side of the longitudinal beams 1a and 1b is divided into four equal parts, passing through a position that is 1/4 from both ends of the side, and positioned on two straight lines L1 and L2 that are parallel to the transverse beams 1c and 1d. In this way, it is fixed by mounting bolts (not shown).

  In the floor structure of the present embodiment configured as described above, when the floor material 2 (floor panels 21 to 26) is subjected to vibrations such as jumping or descending from a step, vibrations are generated by the floor material 2. At the same time, when the floor material 2 vibrates at a specific frequency by vibration input, the mass members 32 of the dynamic dampers 3,... The vibration of the flooring 2 is attenuated and suppressed. Thereby, the heavy floor impact sound (63 Hz band) generated on the floor is efficiently reduced.

  As described above, according to the floor structure of the present embodiment, the mounting members 31 and 31 having the plurality of mounting and fixing portions 31a and 31a arranged at a predetermined distance are provided, and the vertical beams 1a and 1b of the flooring 2 are provided. The side fixing side portions 31a and 31a are positioned on two straight lines L1 and L2 that are divided into four equal sides and are ¼ from both ends of the side and parallel to the horizontal beams 1c and 1d. Since it is fixed, the ratio of the total mass of the mass member 32 to the floor weight (vibration body weight) can be reduced, thereby effectively reducing the weight floor impact sound while suppressing an increase in the floor weight. can do. The above-mentioned excellent effect obtained from the floor structure of the present embodiment has been confirmed by the test described later conducted by the present inventors.

  In the present embodiment, each of the dynamic dampers 3,..., 3 straddles the central portion in the direction in which the vertical beams 1a, 1b of the flooring 2 extend so that each of the mounting fixing portions 31a, 31a is both straight lines L1. Although it is attached so that it may be located on L2, it adjusts the length of mass member 32, and attaches so that each attachment fixing part 31a and 31a may be located only on one of straight lines L1 and L2. Is also possible.

  Further, in the present embodiment, the shear type dynamic dampers 3,..., 3 that elastically support both ends of the mass member 32 so that the rubber elastic bodies 33, 33 are subjected to shear deformation are employed. For example, FIG. ) A compression type dynamic damper 4 as shown in FIG. The dynamic damper 4 includes a mounting member 41 having a supporting substrate 41a and a pair of mounting fixing portions 41b and 41b provided at both ends of the supporting substrate 41a at a predetermined distance, and a pair of elastic members fixed to the supporting substrate 41a. The support members 42 and 42 and a mass member 43 formed into a rectangular block shape by an iron-based metal and elastically supported by the elastic support members 42 and 42 are included. Each elastic support member 42 includes a rubber elastic body 42a formed in a columnar shape, metal plates 42b and 42b formed in a disk shape and bonded to both end faces of the rubber elastic body 42a, and a head portion. Connection bolts 42c and 42c that are embedded in the rubber elastic body 42a and have screw portions protruding from insertion holes formed in the central portions of the metal plates 42b and 42b, and nuts 42d and 42d that are screwed to the connection bolts 42c and 42c. It consists of.

  The elastic support members 42, 42 are tightened with nuts 42 d, 42 d after the screw portions of one of the connecting bolts 42 c, 42 c are respectively screwed into the screw holes provided in the lower end surface of the mass member 32. The mass member 43 is connected. The screw portions of the other connecting bolts 42c and 42c are respectively inserted into insertion holes provided in the support substrate 41a, and then fastened with nuts 42d and 42d to be fixed to the support substrate 41a. Thereby, the mass member 43 is elastically supported by the elastic support members 42 and 42 with respect to the support substrate 41a. Even when the dynamic damper 4 is employed, the mounting fixing portions 41b and 41b are fixed to the floor material 2 so as to be positioned on the two straight lines L1 and L2.

〔test〕
In order to investigate the sound insulation performance of the floor structure of the above embodiment, a test was performed based on JIS A1418-2 “Measurement method of floor impact sound insulation performance of buildings, Part 2: Method using standard weight impact source”. . In this test, as shown in FIG. 4A, a floor structure composed of floor beams 1 in a state where two minimum unit beam protuberances of the above embodiment are combined was adopted as a base. In the floor structure of this base, four solid type rubber mounts (not shown) are connected between the horizontal beam 1c of the floor beam 1 and the floor panels 21 to 26 by through steel (not shown). Are installed at predetermined locations at a distance. Also, between the horizontal beams 1d and 1e of the floor beam 1 and the floor panels 21 to 26, there are four liquid-filled rubber mounts (not shown) connected by through steel (not shown). It is installed at a predetermined location. The floor weight (vibrator weight) of the base was 800 kg. The floor structure of the base is a “ceilinged” structure in which the ceiling of the lower floor is disposed under the floor.

  As shown in FIG. 4 (c), the floor structure prepared as an example has six dynamic dampers (black in the figure) having the same configuration as that of the above embodiment for one beam protuberance of the minimum unit of the base. Is fixed so that the mounting and fixing portions are positioned on the straight lines L1 and L2 in the same manner as in the above embodiment, and is installed on the floor panels 22 to 25. In this case, the total mass of the mass members is 90 kg, and the ratio of the total mass of the mass members to the floor weight is about 11%.

  As a comparative example, as shown in FIG. 4B, the same type of dynamic damper (shown in black in the figure) is applied to one beam protuberance as the minimum unit of the base. A floor structure with eight installed was prepared. The dynamic damper of the comparative example is the same as that of the example with the mass of each mass member being 7.5 kg, but is different only in that the length is slightly shorter than that of the example. The dynamic damper of the comparative example is divided into four equal parts on the side of the vertical beam 1a, 1b side of the flooring, and passes through a position that is approximately 1/4 from both ends of the side, and is parallel to the horizontal beams 1c, 1d, 1e. They are arranged in two rows along the straight lines L1 and L2, and two are installed on each of the four floor panels 22 to 24 so that the center of gravity is along each row. In this case, the total mass of the mass members is 120 kg, and the ratio of the total mass of the mass members to the floor weight is about 15%.

  For the floor structures of these bases, examples and comparative examples, impact sound (impact sound level (dB)) was measured based on the above test method, and floor acceleration spectrum analysis and narrow band sound spectrum analysis were performed. The results shown in Table 1, FIG. 5 and FIG. 6 were obtained. As shown in Table 1, in the case of the comparative example, a significant reduction effect of Δ5 dB with respect to the base was obtained in the octave band center frequency 63 Hz band of the heavy floor impact sound level. In the case of the example as well, a significant reduction effect of Δ5.2 dB equivalent to that of the comparative example was obtained in the octave band center frequency 63 Hz band of the heavy floor impact sound level. 5 and 6 show that the vibration acceleration level and the sound pressure level are reduced particularly in the vicinity of 40 Hz to 60 Hz in both the example and the comparative example with respect to the base. From this, it can be seen that, together with the results in Table 1, the heavy floor impact sound level is greatly reduced.

  From the above results, in the case of the example, although the number of installed dynamic dampers is smaller than that of the comparative example, and the total mass of the mass member is 30 kg (25%) smaller than that of the comparative example, the comparison is made. It can be seen that the effect of reducing the heavy floor impact sound equivalent to the example can be obtained. That is, if the dynamic damper is installed as in the embodiment, the ratio of the total mass of the mass member to the floor weight (vibrating body weight) can be reduced, thereby preventing an increase in the floor weight while reducing the weight floor. It was found that the impact sound can be reduced efficiently.

It is a bottom view of the floor structure concerning the embodiment of the present invention, and is a figure showing the state where the upper floor was looked up from the lower floor side. It is a figure which shows the dynamic damper used for the floor structure which concerns on embodiment of this invention, Comprising: (a) is the top view, (b) is the front view. It is a figure which shows the other dynamic damper used for the floor structure which concerns on embodiment of this invention, Comprising: (a) is the top view, (b) is the front view. It is explanatory drawing which shows typically the arrangement | positioning location of the dynamic damper of the base in a (a)-(c) test, a comparative example, and an Example. It is a graph which shows the analysis result of the floor acceleration spectrum of the base in a test, a comparative example, and an example. It is a graph which shows the analysis result of the narrowband sound spectrum of the base in a test, a comparative example, and an Example.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Floor beam 1a, 1b ... Vertical beam 1c, 1d, 1e ... Horizontal beam 2 ... Floor material 21-26 ... Floor panel 3, 4 ... Dynamic damper 31, 41 ... Mounting member 31a, 41b ... Mounting fixing part 31b ... Mounting hole 31c ... Rising part 32, 43 ... Mass member 33, 42 ... Elastic support member 33a, 42a ... Rubber elastic body 33b, 42b ... Metal plate 33c, 42c ... Connecting bolt 33d, 42d ... Nut 41a ... Support substrate

Claims (5)

A floor beam composed of at least one beam with the beam unit assembled in a rectangular shape by a vertical beam and a horizontal beam as a minimum unit;
A floor material comprising a plurality of floor panels arranged in parallel in the direction in which the transverse beam extends with respect to the beam unit of the minimum unit;
The mounting member includes a plurality of mounting fixing portions arranged at a predetermined distance, a spring member fixed to the mounting member, and a mass member elastically supported by the spring member. A floor structure comprising a plurality of dynamic dampers installed with fixed portions fixed at a plurality of locations,
The dynamic damper divides the side of the floor material on the side of the vertical beam into four equal parts and passes through a position that is ¼ from both ends of the side and is parallel to the horizontal beam on one of the straight lines. A floor structure characterized in that one of the mounting and fixing portions is positioned and the other mounting and fixing portion is positioned on the other straight line .   The floor structure according to claim 1, wherein the floor panel is made of lightweight foam concrete.   The dynamic damper includes a pair of mounting members disposed at a distance from each other, a columnar mass member disposed between the pair of mounting members, and both ends of the mass member provided on each mounting member. The floor structure according to claim 1, comprising an elastic support member that elastically supports the floor structure.   The dynamic damper is fixed so that each of the mounting fixing portions is positioned on both of the straight lines so as to straddle a center portion of the floor material in a direction in which the vertical beam extends. The floor structure according to claim 1.   The floor structure according to any one of claims 1 to 4, wherein the dynamic damper is tuned to have a plurality of types of resonance frequencies in a range above and below a floor eigenvalue.

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