JP2018076698A - Floor structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the sound insulation performance of the floor higher than before.SOLUTION: This invention relates to a floor structure in which: a floor section 17 is formed by attaching a floor surface material 16 to an upper surface of a floor frame section formed by bridging a floor binding beam 15 between floor beams 6, 6; and a damper 21 having a plate-like member 22 having a surface parallel to the floor surface material 16 and a weight portion 23 installed at both width end portions of the plate-like member 22 is attached to the floor binding beam 15. The plate-like member 22 is so designed that a width central portion is attached to the floor binding beam 15. The length from the width central portion to the width end portion of the plate-like member 22 is set to 190 mm or more and 200 mm or less.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a floor structure.

  A unit method for constructing a unit building by transporting a building unit manufactured in advance in a factory to a building site and assembling a plurality of building units at the building site is performed.

  On the other hand, in buildings such as houses, it is required to improve the sound insulation performance of the floor, and a damper effective for enhancing the sound insulation performance of the floor has also been developed in the unit building (for example, see Patent Document 1).

Japanese Patent No. 4854558

  In recent years, due to increasing awareness of the living environment, it has been demanded that the sound insulation performance of the floor be higher than before, and there is a need to improve the above-described dampers to improve the sound insulation performance.

  Therefore, the present invention mainly aims to solve the above-described problems.

  In order to solve the above problems, the present invention comprises a floor portion by attaching a floor surface material to an upper surface of a floor frame portion formed by bridging a floor beam between floor beams. In the floor structure in which a damper having a plate-like member having a plane parallel to the floor material and weight portions installed at both width ends of the plate-like member is attached, the plate-like member has the width center portion described above. It is attached to a floor beam, and the length from the width center portion to the width end portion of the plate-like member is 190 mm or more and 200 mm or less.

  According to the present invention, the above configuration can optimize each part of the damper without changing the basic structure of the damper, thereby improving the sound insulation performance of the floor.

It is the whole unit building perspective view concerning this embodiment. It is a whole perspective view of the building unit used for the unit building of FIG. It is a longitudinal cross-sectional view of the part in which the damper of the unit building was installed. It is a perspective view of a damper. It is a table | surface which shows the structural condition for the optimization with respect to a damper and a floor beam. It is the table | surface which put together the test result by the structural conditions of FIG. It is a top view which shows arrangement | positioning of the damper with respect to a floor structure. It is a figure which shows the relationship between the primary natural frequency in a floor beam, a secondary natural frequency, and a tertiary natural frequency. It is the table | surface which put together the data which become the basis of the graph which shows the relationship between the floor structure of this Embodiment, and the sound insulation performance of a floor, and a graph.

Hereinafter, the present embodiment will be described in detail with reference to the drawings.
1 to 9 are for explaining this embodiment.

  <Configuration> The configuration will be described below.

  A building unit pre-manufactured in a factory is transported to a building site, and a unit building is constructed by assembling a plurality of building units side by side on the building site.

  FIG. 1 shows a unit building 1. In the unit building 1, a plurality of lower floor building units 3 are installed on a foundation 2, and an upper floor building unit 4 is placed on a lower floor building unit 3. A plurality of floors are installed, and a roof panel 5 is installed on a building unit 4 on the upper floor.

  As shown in FIG. 2, each building unit 3, 4 has a space between four corners of floor beams 6, 7 assembled in a rectangular shape in plan view and ceiling beams 8, 9 assembled in a rectangular shape in plan view. A unit frame having a box ramen structure formed by connecting four pillars 11 is provided. The floor beams 6 and 7 and the ceiling beams 8 and 9 are made of channel steel having a C-shaped cross section, and the column 11 is made of a square steel pipe or the like.

  The floor beams 6 and 7 and the ceiling beams 8 and 9 are respectively a pair of parallel beams (the long floor beam 6 and the ceiling beam 8) and a pair of parallel beams (the short floor beam 7 and the ceiling beam). 9), the floor beam 15 is bridged between the long floor beams 6 and 6 to form a floor frame portion, and the floor member 16 is attached to the upper surface of the floor frame portion to form the floor portion 17. doing. Similarly, the ceiling edge 18 is bridged between the long ceiling beams 8 and 8 to form a ceiling frame portion, and a ceiling surface material 19 is attached to the lower surface of the ceiling frame portion to constitute the ceiling portion.

  A plurality of floor beams 15 and ceiling edge 18 are provided in parallel with the girder beam (short floor beam 7 and ceiling beam 9) at a required interval along the girder beam (long floor beam 6 and ceiling beam 8). It has been. The floor beam 15 and the ceiling edge 18 can be formed of a square steel pipe or a square member. In this case, at least the floor beam 15 is a square steel pipe.

  As shown in FIG. 3, the damper 21 is attached to the unit building 1 below the floor portion 17 of the upper floor building unit 4 positioned above the ceiling portion of the lower floor building unit 3.

  The damper 21 is attached to the floor beam 15. And the damper 21 has the plate-shaped member 22 which has a surface parallel to the flooring material 16, and the weight part 23 (mass) installed in the width | variety both ends of the plate-shaped member 22, as shown in FIG. It is supposed to be.

  Here, the damper 21 is installed below the floor beam 15 with a required interval 24 (see FIG. 3) that does not contact the floor beam 15. The damper 21 is attached to the side surface of the floor beam 15 via a wooden or metal attachment member 25. The damper 21 can be attached to the floor beam 15 with an attachment such as a nail or a screw or an adhesive.

  The plate-like member 22 can be elastically deformed. For the plate-like member 22, for example, an end material of a structural material such as a particle board used for the floor material 16, other waste materials, or the like can be used.

  The same weight part 23 is provided in a pair on the left and right sides, and is fixed in a state where it is placed on the upper part of the width end parts of the plate-like member 22. As the weight portion 23, a waste material such as a block or a laminate of vibration damping sheet end materials such as a sile sheet can be used.

  In contrast to the above configuration, this embodiment has the following configuration.

  In other words, without changing the basic structure of the damper 21 described above, as shown in FIG. 5 and FIG. In the following, description will be given in order.

  (1) The plate-like member 22 is attached to the floor beam 15 at the center in the width. And the length from the width center part of the plate-shaped member 22 to the width | variety edge part (= a / 2: a is refer FIG. 4) shall be 190 mm or more and 200 mm or less (No (2) of FIG. 5 and FIG. 6). And (corresponds to (1)).

  Here, the plate-like member 22 is attached to the floor beam 15 at the center of the width, so that both ends of the width become free ends. And the weight part 23 attached to the both ends of the width | variety used as the free end vibrates up and down by the elastic deformation of the plate-shaped member 22, and a damping effect and a sound insulation effect will be acquired. By attaching the center of the width of the plate-like member 22 to the floor beam 15, the damper 21 has a left-right symmetric structure, and it is possible to obtain improved durability and stable sound insulation performance. Since the damper 21 is constituted by the plate-like member 22 and the weight part 23, the structure is simple, the cost is low, and it is not affected by the temperature change.

  In this case, the plate-like member 22 has a thickness of about 20 mm. The length from the width | variety center part of the plate-shaped member 22 to a width | variety edge part is a half length of the width | variety (= a) of the plate-shaped member 22. FIG. Therefore, the width a of the plate-like member 22 is 380 mm to 400 mm. This is smaller than that of the conventional damper 21.

  (2) The length of the plate-like member 22 in the direction along the floor beam 15 (= b: see FIG. 4) is set to 350 mm. Then, the weight 23 has a weight of 5.4 kg or more and 6.0 kg or less (corresponding to Nos. (4) and (3) in FIGS. 5 and 6).

  Here, the length (= b) of the plate-like member 22 in the direction along the floor beam 15 is the depth of the plate-like member 22. The weight portion 23 has, for example, a width (= c) of 100 mm, a depth (= b) of 350 mm, and a thickness (= d) of 48 mm to 60 mm. In this case, the weight portion 23 uses a laminate of a plurality of damping sheets having a thickness of 6 mm.

  (3) The dampers 21 are provided at three or more positions of the center of the floor beam 15 and both sides thereof. And the adjacent damper 21 is installed with the clearance gap 31 (refer FIG. 7) which is 2 mm or more and 30 mm or less (equivalent to No (6) and (5) of FIG. 5 and FIG. 6).

  Here, a plurality of dampers 21 can be installed on the floor portion 17. The plurality of dampers 21 are most preferably provided at the antinode positions (resonance positions) of the vibration mode of the floor portion 17 respectively. Therefore, for example, the damper 21 can be installed at each position obtained by dividing the long floor beam 6 into four equal parts. In this embodiment, as shown in FIG. 7, the damper 21 is installed on the floor beam 15 located at the center of the long floor beam 6 in the extending direction of the long floor beam 6. At the same time, every other floor beam 15 located on both sides of the floor beam 15 is installed (five places in total).

  And about the extending direction of the above-mentioned floor beam 15, for example, as shown in FIG. 8, the position of the antinode of the primary vibration obtained by dividing the floor beam 15 into two equal parts (primary natural frequency: about 63 Hz), The position of the antinode of the secondary vibration obtained by dividing the floor beam 15 into four equal parts (secondary natural frequency: about 125 Hz) and the position of the antinode of the tertiary vibration obtained by dividing the floor beam 15 into eight parts (the third natural frequency: about 250 Hz) or the like. In this embodiment, a plurality of dampers 21 are provided with the above-described gaps 31 so that each floor beam 15 is positioned at or near the position of the vibration belly as described above. (It is preferable to provide an odd number of dampers 21, and the total number of dampers is 5 in FIG. 7).

  (4) The length of the floor beam 15 (= L: see FIG. 8) is set to 2273 mm. In this case, the weight of the floor beam 15 is set to 21.38 kg or more and 23.51 kg or less (corresponding to Nos. (8) and (7) in FIGS. 5 and 6).

  Here, the floor beam 15 is approximately twice as heavy as usual. For this purpose, the thickness (about 1.6 mm) of the square steel pipe constituting the floor beam 15 is made about twice as thick (about 3.2 mm or more) as usual. The floor beam 15 may be at least twice as heavy as the one on which the damper 21 is installed, but all the floor beams 15 constituting the floor portion 17 are approximately twice as heavy as usual. good. In addition, what is necessary is just to determine the weight of the floor beam 15 so that it may become the same ratio as the above, when the length (L) of the floor beam 15 changes.

  Then, when optimizing the damper 21 as described above, an in-house test was performed by changing the dimensions of each part of the damper 21 as shown in FIG. And the result as shown in FIG. 6 was obtained. In this in-house test, a method defined in Japanese Industrial Standard A1419-2 “Evaluation method of sound insulation performance of buildings and building members—Part 2: Floor impact sound insulation performance” is used.

  That is, first, when the length from the width center portion to the width end portion of the plate-like member 22 is set to 200 mm, as shown in No (1) of FIG. 6, the existing floor portion 17 without the damper 21 is provided. On the other hand, it was confirmed that attenuations of 8.7 dB at 63 Hz, 9.2 dB at 125 Hz, 10.2 dB at 250 Hz, and 10.8 dB at 500 Hz were obtained.

  Moreover, when the length from the width | variety center part of the plate-shaped member 22 to the width edge part was 190 mm, as shown to No (2) of FIG. 6, compared with the existing floor part 17 which does not provide the damper 21. It was confirmed that attenuation of 7.8 dB at 63 Hz, 8.3 dB at 125 Hz, 9.2 dB at 250 Hz, and 9.7 dB at 500 Hz was obtained.

  Next, when the weight of the weight portion was set to 6.0 kg, as shown by No (3) in FIG. 6, compared with the existing floor portion 17 not provided with the damper 21, 7.1 dB at 125 Hz, 125 Hz It was confirmed that attenuation of 7.5 dB, 8.3 dB at 250 Hz, and 8.7 dB at 500 Hz was obtained.

  Further, when the weight of the weight portion is 5.4 kg, as shown in No (4) of FIG. 6, compared with the existing floor portion 17 where the damper 21 is not provided, at 63 Hz, 8.7 dB, and 125 Hz. It was confirmed that attenuation of 9.2 dB, 10.2 dB at 250 Hz, and 10.8 dB at 500 Hz was obtained.

  Further, when the gap 31 between the dampers 21 is set to 30 mm, as shown in No (5) of FIG. 6, compared with the existing floor portion 17 where the damper 21 is not provided, 7.4 dB at 63 Hz and 7 at 125 Hz. It was confirmed that attenuation of 8.7 dB at 9.9 dB and 250 Hz and 9.2 dB at 500 Hz was obtained.

  Further, when the gap 31 between the dampers 21 is set to 2 mm, as indicated by No (6) in FIG. 6, compared to the existing floor portion 17 where the damper 21 is not provided, 8.7 dB at 63 Hz and 9 at 125 Hz. It was confirmed that attenuation of 10.2 dB at 2 dB, 250 Hz, and 10.8 dB at 500 Hz was obtained.

  And when the weight of the floor beam 15 was 23.51 kg, as shown in No (7) of FIG. 6, compared with the existing floor part 17 which does not provide the damper 21, 8.3 dB at 63 Hz, It was confirmed that attenuation of 8.8 dB at 125 Hz, 9.7 dB at 250 Hz, and 10.2 dB at 500 Hz was obtained.

  Further, when the weight of the floor beam 15 is 21.38 kg, as shown in No (8) of FIG. 6, 8.7 dB at 63 Hz, compared with the existing floor portion 17 where the damper 21 is not provided. It was confirmed that attenuation of 9.2 dB at 125 Hz, 10.2 dB at 250 Hz, and 10.8 dB at 500 Hz was obtained.

  In summary, as shown in the graph of FIG. 9, the existing floor portion 17 not provided with the damper 21 is like the line A, and the sound insulation performance of the floor does not reach the level of L-60 at 63 Hz. On the other hand, by installing the existing damper 21, 63 Hz is improved as shown by the line B, and the sound insulation performance of the floor reaches the level of L-60. And when the existing damper 21 was used, it was thought that it was a limit to make the sound insulation performance of a floor into the grade of L-55.

  On the other hand, when only the floor beam 15 is approximately twice as heavy as usual, the sound insulation performance of the floor remains the same as the line B, and the floor sound insulation performance does not change from the L-60 grade (line C). However, when the damper 21 optimized as described above is attached, all of 63 Hz, 125 Hz, 250 Hz, and 500 Hz are improved as shown by the line D, and the sound insulation performance of the floor becomes the grade of L-50. As a result, even with the same structure as the existing damper 21, it is possible to exceed the limit of the sound insulation performance of the floor by optimization.

  The above floor structure is provided for the building units 3 and 4. At this time, the floor structure in which the damper 21 as described above is installed may be provided in all the building units 3 and 4 constituting the unit building 1 or the building unit 3 constituting the upper floor. All may be provided, or a part of the building unit 3 constituting the upper floor may be provided. The damper 21 can be attached at the same time when the building units 3 and 4 are manufactured in the factory. Moreover, the damper 21 can also be installed on-site. The level of the unit building 1 provided with the dampers 21 in the building units 3 and 4 is not limited to the second floor, and may be three or more floors.

  The floor structure on which the damper 21 as described above is installed can also be provided for buildings other than the unit building 1.

  <Operation> The operation of this embodiment will be described below.

  For example, when vibration is generated in the floor portion 17 due to a fall of an object or a child's jumping, this vibration is transmitted from the floor portion 17 to the damper 21, and the weight portion 23 of the damper 21 is caused by elastic deformation of the plate-like member 22. The vibration of the floor portion 17 vibrates up and down with a phase difference. By canceling the vibration of the floor portion 17, a vibration damping effect and a sound insulation effect can be obtained.

  <Effect> According to this embodiment, the following effects can be obtained.

  (Effect 1) The plate-like member 22 has the width center portion attached to the floor beam 15 and the length from the width center portion to the width end portion of the plate-like member 22 is 190 mm or more and 200 mm or less. Accordingly, the primary natural frequency of the damper 21 is set to a value in the range of 51 Hz to 53 Hz by optimizing the length of the plate-like member 22 without changing the basic structure of the damper 21. The vibration of the frequency can be efficiently absorbed, and the sound insulation performance of the floor can be improved more than before.

  (Effect 2) The length of the plate-like member 22 in the direction along the floor beam 15 is 350 mm, and the weight 23 is 5.4 kg or more and 6.0 kg or less. Thereby, the primary natural frequency of the damper 21 is set to a value in the range of 51 Hz to 53 Hz by optimizing the weight of the weight portion 23 without changing the basic structure of the damper 21. The vibration of the frequency can be efficiently absorbed, and the sound insulation performance of the floor can be improved more than before.

  (Effect 3) The dampers 21 are provided at three or more positions of the center of the floor beam 15 and both sides thereof, and the adjacent dampers 21 are installed with gaps 31 of 2 mm or more and 30 mm or less. Yes. Accordingly, by optimizing the arrangement of the damper 21 without changing the basic structure of the damper 21, in addition to the primary natural frequency of 51 Hz to 53 Hz, 125 Hz (secondary natural frequency) or 250 Hz (third order). The vibration of the natural frequency) can be effectively absorbed, and the sound insulation performance of the floor can be improved more than before.

  (Effect 4) The length of the floor beam 15 is set to 2273 mm, and the weight of the floor beam 15 is set to 21.38 kg or more and 23.51 kg or less. Thereby, by optimizing the weight of the floor beam 15 in accordance with the damper 21 with improved performance, the sound insulation performance of the floor can be improved more than before.

  And the building units 3 and 4 can acquire the effect similar to the above by providing the building units 3 and 4 provided with the said floor structure. Moreover, the unit building 1 can obtain the same effect as the above by constructing the unit building 1 using the building units 3 and 4 having the floor structure.

  As mentioned above, although embodiment of this invention has been explained in full detail with drawing, embodiment is only an illustration of this invention. Therefore, the present invention is not limited only to the configuration of the embodiment, and it goes without saying that design changes and the like within a scope not departing from the gist of the present invention are included in the present invention. Further, for example, when each embodiment includes a plurality of configurations, it is a matter of course that possible combinations of these configurations are included even if not specifically described. In addition, in the case where a plurality of examples and modifications are disclosed in the embodiment as those of the present invention, possible combinations of combinations extending over these are included even if not specifically described. Of course. Further, the configuration depicted in the drawings is of course included even if not particularly described. Further, when there is a term of “etc.”, it is used in the sense that the equivalent is included. In addition, when there are terms such as “almost”, “about”, “degree”, etc., they are used in the sense that they include those in the range and accuracy recognized by common sense.

DESCRIPTION OF SYMBOLS 1 Unit building 3 Building unit 4 Building unit 6 Floor beam 7 Floor beam 15 Floor beam 16 Floor material 17 Floor part 21 Damper 22 Plate-shaped member 23 Weight part 31 Clearance

Claims (4)

While constructing the floor part by attaching the floor material to the upper surface of the floor frame part formed by bridging the floor beam between the floor beams,
In the floor structure to which a damper having a plate-like member having a surface parallel to the floor material and a weight portion installed at both width end portions of the plate-like member is attached to the floor beam.
The plate-like member is attached to the floor beam with a center width,
A floor structure characterized in that a length from the width center portion to the width end portion of the plate-like member is 190 mm or more and 200 mm or less. The floor structure according to claim 1,
While the length of the plate member in the direction along the floor beam is 350 mm,
A floor structure characterized in that the weight part has a weight of 5.4 kg or more and 6.0 kg or less. In the floor structure according to claim 1 or claim 2,
While providing the damper at three or more positions of the center of the floor beam and its both sides,
A floor structure, wherein the adjacent dampers are installed with a gap of 2 mm or more and 30 mm or less. In the floor structure according to any one of claims 1 to 3,
The floor beam length is 2273 mm,
A floor structure characterized in that a weight of the floor beam is 21.38 kg or more and 23.51 kg or less.