JP6560863B2 - Damping floor structure - Google Patents

Description

  The present invention relates to a floor structure having a damping function.

  Patent Document 1 discloses a vibration-damping floor structure in which a damping material is brought into close contact with the lower surface of a divided floor slab and a plate-like material is brought into close contact with the lower surface of the damping material. Patent Document 1 describes that the plate-like material is a mass of a dynamic vibration absorber. Further, a vibration insulating material is disposed between the divided floor slabs. Further, Patent Document 1 describes that nuts and the like are buried in the lower part of the floor slab in advance, and these are fixed with bolts and the like after the damping material and the plate-like material are attached, and subjected to a fall prevention process.

  Patent Document 2 describes a configuration in which an elastic member is provided in a state where it is urged between opposing saddle members. Patent Document 3 describes a configuration in which an elastic connecting member is disposed between locking grooves of adjacent floor materials for a floor material disposed on an upper surface of a floor slab (floor slab).

Japanese Patent No. 3380722 JP 2003-336343 A JP-A-9-256603

  An object of the present invention is to provide a damping floor structure capable of improving the damping effect by means different from the conventional one in a configuration in which a floor material includes a plurality of divided floor slabs.

The vibration-damping floor structure according to the present invention is a plurality of divided floor slabs obtained by dividing a floor slab, and the plurality of divided floor slabs arranged by adhering side surfaces of adjacent divided floor slabs to each other, A dynamic vibration absorber fixed to the divided floor slab, a viscoelastic sheet provided on the divided floor slab across the abutting part of the adjacent divided floor slab, and a striking part of the adjacent divided floor slab A constraining material arranged to connect the adjacent divided floor slabs with the viscoelastic sheet sandwiched between the divided floor slabs, and the constraining material to squeeze the viscoelastic sheets A plurality of fastening materials that fasten the restraining material to each of the adjacent divided floor slabs while being pressed against the plate side .

The dynamic vibration absorber is disposed across the abutting portion of the adjacent divided floor slabs, one end is fixed at a position different from the restraining material in one of the adjacent divided floor slabs, and the other end is the A beam-shaped spring member that opposes a position different from the restraining material among the other of the adjacent divided floor slabs, and that the other end vibrates, a mass provided on the other end side of the beam-shaped spring member, A viscoelastic body provided on the other end side of the beam-like spring member and in contact with the other of the adjacent divided floor slabs with the vibration of the other end of the beam-like spring member.

One end of the beam-shaped spring member of the dynamic absorber is fixed at a position different from the restraining material in one of the adjacent divided floor slabs, and the viscoelastic body provided at the other end of the beam-shaped spring member is adjacent to It contacts the position which is different from the said restraining material among the other divided floor slabs to fit. Thereby, a high vibration damping effect can be obtained.

It is the figure which looked at the damping floor structure of 1st embodiment from the bottom. It is an enlarged view which shows a part of 2-2 cross section of the damping floor structure of FIG. It is 3-3 sectional drawing of the damping floor structure of FIG. It is the figure which looked at the damping floor structure of FIG. 3 from the bottom. It is a figure which shows the top view of a non-damping floor structure, and the position which detects the relative displacement of the adjacent division | segmentation floor slab in a non-damping floor structure. It is a figure which shows the deformation | transformation state at the time of giving a vibration to the non-damping floor structure shown in FIG. It is a graph which shows the relative displacement of the adjacent floor slab in each position of FIG. It is the figure which looked at the damping floor structure of 2nd embodiment from the bottom. It is an enlarged view which shows a part of cross section of the damping floor structure of 3rd embodiment. FIG. 10 is a 10-10 cross-sectional view of the vibration-damping floor structure of FIG. 9. It is the figure which looked at the damping floor structure of 4th embodiment from the bottom. It is an enlarged view which shows a part of cross section of the damping floor structure of 5th embodiment.

<First embodiment>
(1. Damping floor structure)
The damping floor structure 1 of 1st embodiment is demonstrated with reference to FIGS. 1-4. As shown in FIGS. 1 to 4, the damping floor structure 1 includes a floor slab 10, a flooring material 20, a plurality of viscoelastic sheets 30, a plurality of restraining materials 40, a plurality of fastening materials 50, and a plurality of dynamic vibration absorbers 60. Is provided.

  As shown in FIG. 1, the floor slab 10 includes a plurality of divided floor slabs 11 a to 11 f and 12 a to 12 f obtained by dividing the floor slab 10. In the present embodiment, the floor slab 10 includes 12 divided floor slabs 11a to 11f and 12a to 12f. Each of the plurality of divided floor slabs 11a to 11f and 12a to 12f includes a rectangular upper and lower surface. Each of the plurality of divided floor slabs 11a to 11f and 12a to 12f is formed by ALC (Autoclaved Lightweight Aerated Concrete).

  The floor slab 10 is fixed to the upper surfaces of the beams 2 to 8 formed in a rectangular shape. A flooring material 20 is attached to the upper surface of the floor slab 10. The flooring material 20 is, for example, a floor material such as plywood. The transverse beams 2 to 4 are arranged in parallel at a distance, the longitudinal beams 5 and 6 are arranged in parallel at a distance, and are suspended between the transverse beams 2 and 3, and the longitudinal beams 7 and 8 are They are arranged in parallel at a distance and are suspended between the transverse beams 3 and 4. The plurality of beams 2 to 8 are formed of, for example, H-shaped steel.

  Each of the plurality of divided floor slabs 11a to 11f and 12a to 12f is disposed by abutting the side surfaces of the adjacent divided floor slabs 11a to 11f and 12a to 12f without bonding. That is, no members are interposed in the abutting portions of the plurality of divided floor slabs 11a to 11f and 12a to 12f. The plurality of divided floor slabs 11 a to 11 f are arranged on the upper surfaces of the horizontal beams 2 and 3 and bridge the horizontal beams 2 and 3. The plurality of divided floor slabs 11a to 11f are arranged such that the side surfaces of the long sides are butted together. Central portions in the short direction at both ends in the longitudinal direction of the plurality of divided floor slabs 11a to 11f are fastened to the cross beams 2 and 3 by two bolts.

  The plurality of divided floor slabs 12 a to 12 f are arranged on the upper surfaces of the horizontal beams 3 and 4 and bridge the horizontal beams 3 and 4. The plurality of divided floor slabs 12a to 12f are arranged such that the side surfaces of the long sides are butted. Center portions in the short direction at both ends in the longitudinal direction of the plurality of divided floor slabs 12a to 12f are fastened to the cross beams 3 and 4 by two bolts. The plurality of divided floor slabs 11 a to 11 f and the plurality of divided floor slabs 12 a to 12 f are arranged on the upper surface of the cross beam 3 with the side surfaces of the short sides facing each other.

  In the following, in order to make the explanation easier to understand, FIGS. 2 to 4 are enlarged for some of the divided floor slabs 11b to 11d among the plurality of divided floor slabs 11a to 11f and 12a to 12f shown in FIG. The description will be given with reference. That is, in FIGS. 2 to 4, two divided floor slabs 11 b and 11 c and two divided slabs are shown as examples of adjacent divided slabs among the plurality of divided floor slabs 11 a to 11 f and 12 a to 12 f shown in FIG. 1. The case where floor slabs 11c and 11d are extracted will be described as an example. The other adjacent divided floor slabs are the same as the adjacent divided floor slabs 11b and 11c and the two divided floor slabs 11c and 11d.

  As shown in FIGS. 2 to 4, the viscoelastic sheet 30 is formed in a rectangular sheet shape by rubber. The viscoelastic sheet 30 is provided in contact with the lower surfaces of the adjacent divided floor slabs 11b and 11c across the adjacent divided floor slabs 11b and 11c. In particular, the viscoelastic sheet 30 is bonded to the adjacent divided floor slabs 11b and 11c. The viscoelastic sheet 30 is provided along a long-sided butted portion among the plurality of divided floor slabs 11a to 11f and 12a to 12f shown in FIG. In the present embodiment, 20 viscoelastic sheets 30 are provided on the floor slab 10.

  Here, in this embodiment, both ends in the longitudinal direction of the plurality of divided floor slabs 11a to 11f and 12a to 12f are fixed to the transverse beams 2 to 4, and both ends in the short direction are attached to any of the beams 2 to 8. Also not fixed. Therefore, both ends in the longitudinal direction of the plurality of divided floor slabs 11a to 11f and 12a to 12f are not easily displaced with respect to the beams 2 to 8, but both ends in the short direction are relatively displaced with respect to the beams 2 to 8. It's easy to do.

  Furthermore, as shown in FIG. 1, the viscoelastic sheet 30 is not arrange | positioned in the center part of the lower surface in each of several division | segmentation floor slabs 11a-11f and 12a-12f. That is, the adjacent viscoelastic sheets 30 are arranged at a distance. As shown in FIGS. 2 to 4, the viscoelastic sheet 30 straddling the adjacent divided floor slabs 11 b and 11 c and the viscoelastic sheet 30 straddling the adjacent divided floor slabs 11 c and 11 d are separated from each other.

  Here, the viscoelastic sheet 30 uses, for example, butyl rubber. And since the viscoelastic sheet 30 itself is formed in the material which has adhesive force, the viscoelastic sheet 30 adhere | attaches on the adjacent divided floor slabs 11b and 11c. The thickness of the viscoelastic sheet 30 is determined by the relative displacement of the adjacent divided floor slabs 11a to 11f and 12a to 12f to be attached. A method for determining the thickness of the viscoelastic sheet 30 will be described later.

  The restraining material 40 is provided in contact with the lower surface of the viscoelastic sheet 30. In this embodiment, 20 restraining members 40 are provided on the floor slab 10. In particular, the restraining material 40 adheres to the viscoelastic sheet 30. The restraining material 40 is formed in a rectangular sheet shape having the same shape as the viscoelastic sheet 30. That is, the restraining material 40 contacts the entire viscoelastic sheet 30. The restraint member 40 is formed of a material having higher rigidity against bending than rubber. The restraining material 40 is made of a metal such as iron or aluminum, for example. The restraining material 40 sandwiches the viscoelastic sheet 30 between the adjacent divided floor slabs 11b and 11c. That is, a part of the viscoelastic sheet 30 is sandwiched between a part of the restraining material 40 and the divided floor slab 11b. Further, the remaining part of the viscoelastic sheet 30 is sandwiched between the remaining part of the restraining material 40 and the divided floor slab 11c.

  The restraining material 40 is formed in the same shape as the viscoelastic sheet 30 and is provided in contact with the entire viscoelastic sheet 30. Therefore, as shown in FIG. 1, not only the viscoelastic sheet 30 but also the restraining material 40 is arranged at the center of the lower surface of each of the plurality of divided floor slabs 11a to 11f and 12a to 12f. In other words, the adjacent restraining materials 40 are arranged at a distance. As shown in FIGS. 2 to 4, the restraining material 40 straddling the adjacent divided floor slabs 11 b and 11 c is separated from the restraining material 40 straddling the adjacent divided floor slabs 11 c and 11 d.

  In the present embodiment, the plurality of fastening members 50 are metal countersunk head tapping screws. In addition, the plurality of fastening members 50 may be pan head tapping screws. The plurality of fastening materials 50 fasten one constraining material 40 to each of the adjacent divided floor slabs 11b and 11c. Specifically, a part of the plurality of fastening members 50 is inserted through a hole (not shown) formed in one constraining member 40, and further penetrates one viscoelastic sheet 30, thereby dividing the divided floor slab 11b. Inserted into. That is, some of the plurality of fastening materials 50 integrally connect the divided floor slab 11b, the viscoelastic sheet 30, and the restraining material 40.

  On the other hand, the remaining part of the plurality of fastening members 50 is inserted through a hole (not shown) formed in one restraint member 40 and further penetrates one viscoelastic sheet 30 to be divided into another part. It is inserted into the floor slab 11c. That is, the remaining part of the plurality of fastening materials 50 integrally connects the other divided floor slab 11 c, the viscoelastic sheet 30, and the restraining material 40. Furthermore, the some fastening material 50 fastens the restraint material 40 to each of the adjacent divided floor slabs 11b and 11c so that each of the some viscoelastic sheet 30 may be crushed.

  Therefore, the adjacent divided floor slabs 11 b and 11 c are connected by the restraining material 40 and the plurality of fastening materials 50. However, the viscoelastic sheet 30 is interposed between the adjacent divided floor slabs 11 b and 11 c and the restraining material 40. Therefore, the adjacent divided floor slabs 11b and 11c can be relatively displaced by the amount of deformation of the viscoelastic sheet 30. When the adjacent divided floor slabs 11 b and 11 c are displaced in a direction approaching the restraining material 40, the viscoelastic sheet 30 is compressed, and thus is displaced within the range of the maximum compressive deformation amount of the viscoelastic sheet 30. Here, the viscoelastic sheet 30 is bonded to the adjacent divided floor slabs 11 b and 11 c and the restraining material 40. Therefore, when the adjacent divided floor slabs 11 b and 11 c are displaced in the direction away from the restraining material 40, the viscoelastic sheet 30 is pulled, so that it is displaced within the range of the maximum tensile deformation amount of the viscoelastic sheet 30.

  In the present embodiment, the two viscoelastic sheets 30 and the restraining material 40 are integrally connected across the adjacent divided floor slabs 11b and 11c. However, the lengths of the adjacent divided floor slabs 11b and 11c are integrated. The viscoelastic sheet 30 and the restraining material 40 may be integrally connected in the vicinity of the center in the direction, and the position and the number are not limited as long as they are arranged across the adjacent divided floor slabs 11b and 11c.

  As shown in FIG. 1, the plurality of dynamic vibration absorbers 60 are fixed at different positions from the viscoelastic sheet 30 on the lower surfaces of the plurality of divided floor slabs 11 b to 11 e and 12 b to 12 e. Two dynamic vibration absorbers 60 are provided on the plurality of divided floor slabs 11b to 11e and 12b to 12e. Specifically, two dynamic vibration absorbers 60 are provided at the center of the plurality of divided floor slabs 11b to 11e and 12b to 12e. In the present embodiment, 16 dynamic vibration absorbers 60 are provided on the floor slab 10.

  As shown in FIGS. 2 to 4, in the present embodiment, the dynamic vibration absorber 60 is a beam-like spring type dynamic vibration absorber. For example, the dynamic vibration absorber 60 is a leaf spring type dynamic vibration absorber. The dynamic vibration absorber 60 includes a beam-shaped spring member 61, a mass 62, and a viscoelastic body 63.

  The beam-like spring member 61 is formed in a long shape, for example, with metal. The beam-like spring member 61 is, for example, a flat plate or a bent plate. One end of the beam-shaped spring member 61 is fixed to a position different from the viscoelastic sheet 30 in the divided floor slab 11b. That is, the beam-like spring member 61 directly inputs the vibration of the divided floor slab 11 b without being affected by the viscoelastic sheet 30. The other end of the beam-shaped spring member 61 vibrates with respect to the divided floor slab 11b. That is, the beam-like spring member 61 uses the bending deformation as a spring force. When the beam-like spring member 61 is bent, the other end of the beam-like spring member 61 vibrates with respect to one end.

  Furthermore, the longitudinal direction of the beam-like spring member 61 coincides with the longitudinal direction of the divided floor slab 11b. Thereby, it becomes easy to secure a space in a position different from the viscoelastic sheet 30. Furthermore, one end of the beam-like spring member 61 is provided at the center of the divided floor slab 11b, and the other end of the beam-like spring member 61 is provided at a position away from the center of the divided floor slab 11b. Since both ends in the longitudinal direction of the divided floor slab 11b are fixed to the transverse beams 2 and 3, the center portion is most easily displaced in the longitudinal direction of the divided floor slab 11b. Therefore, by providing one end of the beam-like spring member 61 at the center, the beam-like spring member 61 can surely input the vibration of the divided floor slab 11b.

  The mass 62 is made of metal and is provided on the other end side of the beam-like spring member 61. Specifically, the mass 62 is fixed to the lower surface of the beam-like spring member 61 and is provided so as not to contact the divided floor slab 11b. The viscoelastic body 63 is made of rubber. The viscoelastic body 63 is provided on the other end side of the beam-like spring member 61. The viscoelastic body 63 contacts a position different from the viscoelastic sheet 30 in the divided floor slab 11b. That is, the viscoelastic body 63 directly contacts the divided floor slab 11b without using the viscoelastic sheet 30. The mass 62 may use other heavy objects such as concrete.

  As the viscoelastic body 63 vibrates at the other end of the beam-like spring member 61, the viscoelastic body 63 may repeat contact and separation with respect to the divided floor slab 11b, or the other end of the beam-like spring member 61 vibrates. During this time, the state of being in constant contact may be maintained. In the former case, the viscoelastic body 63 strikes the divided floor slab 11b. In the latter case, the viscoelastic body 63 applies a compressive force according to the state.

  That is, the mass 62 of the dynamic vibration absorber 60 vibrates in place of the vibrations of the divided floor slabs 11a to 11f and 12a to 12f, thereby suppressing the vibrations of the divided floor slabs 11a to 11f and 12a to 12f. Furthermore, when the viscoelastic body 63 of the dynamic vibration absorber 60 is in contact with the divided floor slabs 11a to 11f and 12a to 12f, vibrations of the divided floor slabs 11a to 11f and 12a to 12f are further suppressed.

  Here, in this embodiment, the dynamic vibration absorber 60 is provided at a position facing the lower surface of only one divided floor slab 11b. That is, the beam-like spring member 61 of the dynamic vibration absorber 60 is located at a position where the entire beam-like spring member 61 faces one divided floor slab 11b, and the viscoelastic body 63 of the dynamic vibration absorber 60 is It contacts the divided floor slab 11b to which the spring member 61 is fixed. In this case, the viscoelastic body 63 corresponds to the operation of the divided floor slab 11 b that causes the mass 62 to vibrate.

(2. Setting method of thickness of viscoelastic sheet)
Next, a method for setting the thickness of the viscoelastic sheet 30 will be described with reference to FIGS. The vibration damping floor structure 1 includes a viscoelastic sheet 30, a restraining material 40, a fastening material 50, and a dynamic vibration absorber 60 in addition to the divided floor slabs 11 a to 11 f and 12 a to 12 f attached to the beams 2 to 8. Here, the setting of the thickness is a non-restrictive configuration that includes only the divided floor slabs 11a to 11f and 12a to 12f, that is, a configuration that does not include the viscoelastic sheet 30, the restraining material 40, the fastening material 50, and the dynamic vibration absorber 60. The bed structure 100 is used.

  A predetermined vibration condition is given to the non-damping floor structure 100. Here, a heavy floor impact sound (LH) test is performed on the non-damped floor structure 100. At this time, the relative displacement of the adjacent divided floor slabs 11a to 11f was detected at the positions P1 to P5 in FIG. For example, as shown in FIG. 6 in which the floor slab 10 in the non-damping floor structure 100 when an impact is applied is modeled, the abutting portions of the divided floor slabs 11b and 11c are displaced most.

  In the process after the impact is applied, the relative displacements of the adjacent divided floor slabs 11a to 11f at the respective positions P1 to P5 are as shown in FIG. Here, FIG. 7 shows the result of extracting the relative displacement in the 63 Hz band where the impact sound level is the highest. As shown in FIG. 7, immediately after the impact is applied, the relative displacement of the adjacent divided floor slabs 11a to 11f increases. In particular, the relative displacements of the divided floor slabs 11a and 11b adjacent in P2 are Da and -Db, which are larger than the others. In this test, the maximum relative displacement Dmax of the adjacent divided floor slabs 11a to 11f is | Db | which is the absolute value of the maximum relative displacement (−Db) of the adjacent divided floor slabs 11b and 11c. This maximum relative displacement Dmax is defined as a reference displacement. It should be noted that the frequency band of the heavy floor impact sound (LH) test and the location to which the impact is applied are appropriately set according to the required damping conditions.

  And the thickness of the viscoelastic sheet | seat 30 in the state attached to the some division | segmentation floor slab 11a-11f, 12a-12f is set more than the reference | standard displacement Dmax. For example, when the reference displacement Dmax is 1 mm, the thickness of the viscoelastic sheet 30 is set to 1 mm or more.

  However, as described above, the adjacent divided floor slabs 11 b and 11 c can be relatively displaced by the amount of deformation of the viscoelastic sheet 30. That is, when the adjacent divided floor slabs 11 b and 11 c are displaced in a direction approaching the restraining material 40, the viscoelastic sheet 30 is compressed, and thus is displaced within the range of the maximum compressive deformation amount of the viscoelastic sheet 30. On the other hand, when the adjacent divided floor slabs 11 b and 11 c are displaced in the direction away from the restraining material 40, the viscoelastic sheet 30 is pulled, so that it is displaced within the range of the maximum tensile deformation amount of the viscoelastic sheet 30.

  Therefore, in order to reliably exhibit the vibration damping effect, the viscoelastic sheet 30 has a maximum compressive deformation amount and a maximum tensile deformation amount that are equal to or larger than the reference displacement Dmax of the adjacent divided floor slabs 11b and 11c. A thickness of 30 may be formed. That is, the viscoelastic sheet 30 itself can reliably absorb the maximum relative displacement of the adjacent divided floor slabs 11b and 11c.

<Second embodiment>
In the first embodiment, 16 dynamic vibration absorbers 60 are provided on the floor slab 10. In addition, the vibration damping floor structure 200 of the second embodiment may be provided with 24 dynamic vibration absorbers 60 on the floor slab 10, as shown in FIG. Specifically, three dynamic vibration absorbers 60 are provided in each of the plurality of divided floor slabs 11b to 11e and 12b to 12e.

<Third embodiment>
In the first embodiment, the fastening material 50 is a tapping screw. In addition, in the damping floor structure 300 of the third embodiment, the plurality of fastening materials 350 may be bolt members 351 and nuts 352 as shown in FIGS. 9 and 10. The bolt member 351 includes a seat plate 351a and two bolts 351b and 351c integrally coupled to the seat plate 351a. In addition, through holes through which bolts 351b and 351c can be inserted are formed in the plurality of divided floor slabs 11a to 11f and 12a to 12f. The nut 352 is screwed to the bolts 351b and 351c on the lower surface side of the restraining material 40.

  Here, the seat plate 351 a is formed in a rectangular sheet shape similar to the viscoelastic sheet 30 and the restraining material 40. That is, the plurality of divided floor slabs 11a to 11f and 12a to 12f are sandwiched in the vertical direction by the restraining material 40 and the seat plate 351a of the fastening material 350. The dynamic vibration absorber 60 is provided on the floor slab 10 as in the first embodiment.

<Fourth embodiment>
As shown in FIG. 11, the damping floor structure 400 of the fourth embodiment is a structure in which the dynamic vibration absorber 60 is removed from the damping floor structure 1 of the first embodiment. That is, the damping floor structure 400 includes the floor slab 10, the viscoelastic sheet 30, the restraining material 40, and the fastening material 50, and does not include the dynamic vibration absorber 60 (shown in FIG. 1). The viscoelastic sheet 30, the restraining material 40, and the fastening material 50 in the fourth embodiment are provided on the floor slab 10 as in the first embodiment. Moreover, you may arrange | position the viscoelastic sheet 30 and the restraint material 40 in the site | part of the dynamic vibration absorber 60 in the said embodiment. In this case, in addition to the damping effect by the viscoelastic sheet 30 shown in FIG. 11, the damping effect by the added viscoelastic sheet 30 is obtained.

<Fifth embodiment>
In the first embodiment, the dynamic vibration absorber 60 is disposed so as to face each of the same divided floor slabs 11a to 11f and 12a to 12f. That is, the dynamic vibration absorber 60 in the first embodiment does not straddle the adjacent divided floor slabs 11b and 11c.

  On the other hand, the vibration damping floor structure 500 of 5th embodiment is arrange | positioned ranging over the division | segmentation floor slabs 11b and 11c to which the dynamic vibration damper 560 adjoins, as shown in FIG. That is, one end of the beam-like spring member 561 of the dynamic vibration absorber 560 is fixed to one (11c side) of the adjacent divided floor slabs 11b and 11c, and the other end of the beam-like spring member 561 is fixed to the adjacent divided floor slab 11b. , 11c to the other side (11b side). At this time, the beam-like spring member 561 straddles the butted portions of the adjacent divided floor slabs 11b and 11c, and straddles the viscoelastic sheet 30 and the restraining material 40.

  The mass 562 and the viscoelastic body 563 are located at positions facing the other (the 11b side) of the adjacent divided floor slabs 11b and 11c. In particular, the viscoelastic body 563 contacts the other (11b side) of the adjacent divided floor slabs 11b and 11c.

<Discussion>
A heavy floor impact sound test was performed on the vibration damping floor structures 1, 200, and 400 of the first embodiment, the second embodiment, and the fourth embodiment. For comparison, the same heavy floor impact sound test was conducted for the non-damped floor structure 100 as well. Furthermore, for the purpose of comparison, the same heavy floor impact sound test was performed on a vibration-damping floor structure including the dynamic vibration absorber 60 and not including the viscoelastic sheet 30, the restraining material 40, and the fastening material 50.

  Table 1 shows the results. The “damping floor structure (comparative example)” in the bottom column of Table 1 is the above-described damping floor structure as a comparative example. The effect column indicates the amount of difference with respect to the impact sound level (LH number) in the 63 Hz band in the non-damped floor structure 100. A negative effect means that the impact sound level (LH number) in the 63 Hz band is low.

  As shown in Table 1, the damping floor structures 1, 200, and 400 of the first, second, and fourth embodiments all exhibited a damping effect as compared to the non-damping floor structure 100. Comparing the vibration damping floor structures 1, 200 of the first and second embodiments, it can be seen that the greater the number of dynamic vibration absorbers 60, the higher the vibration damping effect.

  Moreover, the damping floor structure 400 of 4th embodiment has a small damping effect compared with the structure (1st, 2nd embodiment) provided with a dynamic vibration absorber. Both can be properly used according to the required vibration sound level and cost.

  Moreover, the damping floor structure 200 of 2nd embodiment exhibited the damping effect equivalent to the damping floor structure as a comparative example. That is, the damping floor structure 200 of the second embodiment exhibits a damping effect by the viscoelastic sheet 30 even when the number of the dynamic vibration absorbers 60 is reduced. Furthermore, the damping floor structure 400 of 4th embodiment is provided with a higher damping effect, when the same number of dynamic dampers 60 as the damping floor structure as a comparative example are provided.

  By the way, since the damping floor structure 300 of 3rd embodiment differs only in the fastening method with respect to 1st embodiment, it exhibits the damping effect equivalent to the damping floor structure 1 of 1st embodiment. Further, the vibration damping floor structure 500 of the fifth embodiment is different in the divided floor slabs 11a to 11f and 12a to 12f with which the viscoelastic body 563 of the dynamic vibration absorber 560 contacts, but the vibration damping effect equivalent to that of the first embodiment. Demonstrate.

<Summary>
The damping floor structures 1,200, 300, 400, 500 are a plurality of divided floor slabs 11b, 11c obtained by dividing the floor slab 10, and the side surfaces of adjacent divided floor slabs 11b, 11c are abutted against each other without bonding. A plurality of divided floor slabs 11b, 11c to be arranged, a viscoelastic sheet 30 provided in contact with the lower surface of the divided floor slabs 11b, 11c across the adjacent divided floor slabs 11b, 11c, and a lower surface of the viscoelastic sheet 30 And the restraining material 40 sandwiching the viscoelastic sheet 30 between the divided floor slabs 11b and 11c, and the restraining material 40 is pressed against the divided floor slabs 11b and 11c so as to crush the viscoelastic sheet 30. In this state, a plurality of fastening materials 50 and 150 for fastening the restraining material 40 to the adjacent divided floor slabs 11b and 11c are provided.

  The viscoelastic sheet 30 is provided across the adjacent divided floor slabs 11b and 11c. The restraining material 40 is fastened to one of the adjacent divided floor slabs 11b and 11c by some fastening materials 50 and 150. Furthermore, the restraining material 40 is fastened to the other of the adjacent divided floor slabs 11b and 11c by another part of the fastening materials 50 and 150. Thus, the restraining material 40 is firmly fixed to both the adjacent divided floor slabs 11b and 11c. That is, the restraining material 40 does not function as a mass of the dynamic vibration absorber 60 but has a function of connecting the adjacent divided floor slabs 11b and 11c.

  Further, the viscoelastic sheet 30 is sandwiched between the adjacent divided floor slabs 11 b and 11 c and the restraining material 40. That is, the restraining material 40 connects the adjacent divided floor slabs 11b and 11c with the viscoelastic sheet 30 interposed therebetween. Here, the adjacent divided floor slabs 11b and 11c are relatively displaced in the vibration direction because the side surfaces are arranged in contact with each other without being bonded. When the viscoelastic sheet 30 is sandwiched between the divided floor slabs 11b and 11c and the restraining material 40, the adjacent divided floor slabs 11b and 11c are relatively less than the thickness of the viscoelastic sheet 30. When displaced, the viscoelastic sheet 30 itself exhibits the function of attenuating the displacement.

  Further, in a state where the viscoelastic sheet 30, the restraining material 40, and the plurality of fastening materials 50, 150 are not attached to the plurality of divided floor slabs 11b, 11c, the maximum relative of the adjacent divided floor slabs 11b, 11c in a predetermined vibration condition The displacement Dmax is defined as a reference displacement, and the thickness of the viscoelastic sheet 30 attached to the divided floor slabs 11b and 11c is set to be equal to or greater than the reference displacement Dmax. Thereby, the viscoelastic sheet 30 exhibits the damping effect reliably.

  The damping floor structures 1, 200, 300, and 500 include dynamic vibration absorbers 60 and 560 that are fixed at different positions from the viscoelastic sheet 30 on the lower surfaces of the divided floor slabs 11b and 11c. Thereby, the damping floor structure 1,200,300,500 exhibits the damping effect by the viscoelastic sheet 30 and the damping effect by the dynamic vibration absorbers 60,560.

  The dynamic vibration absorbers 60 and 560 have beam-shaped spring members 61 and 561 whose one ends are fixed at positions different from the viscoelastic sheet 30 in the divided floor slabs 11b and 11c and whose other ends vibrate; It is provided with masses 62 and 562 provided on the other end side of 561. Thereby, in the case where the dynamic vibration absorbers 60 and 560 are configured to include the beam-like spring members 61 and 561, the vibration damping effect is surely exhibited.

  The dynamic vibration absorbers 60 and 560 are provided on the other end side of the beam-like spring members 61 and 561, and viscoelastic bodies 63 and 563 that are in contact with the divided floor slabs 11b and 11c at positions different from the viscoelastic sheet 30 are provided. Prepare. When the viscoelastic bodies 63 and 563 are in contact with different positions from the viscoelastic sheet 30, a higher vibration damping effect can be obtained.

  Further, the viscoelastic body 63 in the vibration damping floor structure 1, 200, 300, 400 is in contact with the divided floor slab 11b to which the beam-like spring member 61 of the dynamic vibration absorber 60 constituting the viscoelastic body 63 is fixed. The beam-like spring member 61 is located at a position where the entire beam-like spring member 61 faces one divided floor slab 11b. Thereby, the length of the beam-like spring member 61 of the dynamic vibration absorber 60 can be shortened, and a high vibration damping effect can be obtained.

  Further, the viscoelastic body 563 in the vibration damping floor structure 500 contacts the divided floor slab 11b adjacent to the divided floor slab 11c to which the beam-like spring member 561 of the dynamic vibration absorber 560 constituting the viscoelastic body 563 is fixed. The beam-like spring member 561 is disposed across the adjacent divided floor slabs 11b and 11c. Even with such a structure, a high damping effect can be obtained.

1,200,300,400,500: Damping floor structure, 2-8: Beam, 10: Floor slab, 11a-11f, 12a-12f: Divided floor slab, 20: Flooring material, 30: Viscoelastic sheet, 40 : Restraint material, 50, 350: Fastening material, 60, 560: Dynamic vibration absorber, 61, 561: Beam spring member, 62, 562: Mass, 63, 563: Viscoelastic body, 100: Non-damping floor structure, 351: Bolt member, 351a: Seat plate, 351b, 351c: Bolt, 352: Nut, Dmax: Reference displacement (maximum relative displacement)

Claims (3)

A plurality of divided floor slabs obtained by dividing a floor slab, and the plurality of divided floor slabs arranged by abutting side surfaces of adjacent divided floor slabs non-adhesively,
A dynamic vibration absorber fixed to the divided floor slab,
A viscoelastic sheet provided on the divided floor slab straddling the butted portion of the adjacent divided floor slabs;
A constraining material that is disposed across the abutting portion of the adjacent divided floor slabs and connects the adjacent divided floor slabs with the viscoelastic sheet sandwiched between the divided floor slabs;
A plurality of fastening materials for fastening the restraining material to each of the adjacent divided floor slabs in a state in which the restraining material is pressed against the divided floor slab so as to crush the viscoelastic sheet;
With
The dynamic vibration absorber is
The striking part of the adjacent divided floor slabs is disposed across the abutting portion, one end of the adjacent divided floor slab is fixed at a position different from the restraining material, and the other end is adjacent to the adjacent divided floor slab. A beam-like spring member that is opposed to a position different from the constraining material among the other, and the other end vibrates ,
A mass provided on the other end side of the beam-like spring member;
A viscoelastic body provided on the other end side of the beam-shaped spring member, and in contact with the other of the adjacent divided floor slabs with vibration of the other end of the beam-shaped spring member;
A vibration-damping floor structure. The beam-like spring member is fixed to the one of the adjacent divided floor slabs, and directly inputs the vibration of the one of the divided floor slabs without using the restraining material,
The vibration damping floor structure according to claim 1 , wherein the viscoelastic body directly contacts the other side of the divided floor slab without using the constraining material. In a state where the viscoelastic sheet, the restraining material, and the plurality of fastening materials are not attached to the plurality of divided floor slabs, the impact sound level in the 63-Hz band is adjacent to the heavy floor impact sound test as a predetermined vibration condition. The maximum relative displacement is defined as a reference displacement among the relative displacements of the divided floor slabs,
The damping floor structure according to claim 1 or 2 , wherein a thickness of the viscoelastic sheet in a state of being attached to the divided floor slab is set to be equal to or greater than the reference displacement.

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