JP2017194152A - Laminate damping structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a damping layer thinner while securing a vibration reduction performance.SOLUTION: A laminate damping structure (damping material 30) has a laminate body 38 in which damping layers 36 softer than a plate 22 are laminated on both surfaces of n pieces of plates 22, and restraining plates 32 which restrain an outer surface of the damping layer 36.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a laminated vibration damping structure.

  In Patent Document 1 below, there is a vibration damping molding that absorbs vibration energy by laminating a constraining layer on the surface of a laminated molding in which damping layers and adhesive layers are alternately laminated, and shearing the laminated molding. It is disclosed.

JP 2003-278832 A

  In the vibration damping molded article of Patent Document 1, the damping effect can be enhanced by increasing the thickness of the damping layer. However, thickening the damping layer takes up space. At this time, for example, when a vibration-damping molded product is used as a flooring material, the ceiling height is lowered by the thickness of the floor, which affects the comfortability. Further, since the damping layer is generally expensive, the cost increases if the damping layer is thick.

  In view of the above facts, an object of the present invention is to provide a laminated vibration damping structure capable of thinning the vibration damping layer while ensuring vibration reduction performance.

The laminated damping structure of claim 1 includes a laminate in which damping layers softer than the plate material are laminated on both surfaces of n plate members, and a restraining member that restrains the outer surface of the damping layer.

  In the laminated damping structure according to claim 1, the damping layer has, for example, a two-layer structure when n = 1 sheets and a three-layer structure when n = 2 sheets. That is, a plurality of damping layers are configured. And the outer surface of the damping layer is restrained by the restraining member.

  In this laminated damping structure, by placing a damping layer that is softer than the plate material across the plate material, when the bending vibration mode is applied, the damping layer shears and deforms against the plate material, and vibration damping due to shear strain energy Generate power.

  In this laminated damping structure, the total sum of shear deformation of the damping layer is larger than that of a laminated damping structure having only one damping layer having a thickness equal to the total thickness of each damping layer. For this reason, the vibration reduction performance of the laminated damping structure of the present invention is greater than that of the laminated damping structure in which the damping layer is a single layer. In other words, an equivalent vibration reduction performance can be exhibited with a vibration damping layer that is thinner than one vibration damping layer.

  A laminated damping structure according to a second aspect is the laminated damping structure according to the first aspect, wherein each of the damping layers includes a plurality of layers.

  In the laminated vibration damping structure according to claim 2, each of the vibration damping layers disposed on both surfaces of the plate material is formed into a plurality of layers. For this reason, when a bending vibration mode acts, each layer in a damping layer shear-deforms. For this reason, the vibration damping effect can be enhanced.

  A laminated vibration damping structure according to a third aspect is the laminated vibration damping structure according to the second aspect, wherein each of the plurality of layers is formed of a sheet material in which different types of materials are bonded to each other.

  In the laminated vibration damping structure according to claim 3, each of a plurality of layers is formed of a sheet material. The sheet material is formed by bonding different types of materials to each other. For this reason, compared with the case where the material which comprises each layer of a damping layer is disjoint (a state where one layer and the other layer are not bonded to each other, such as a state where they are not joined together by any means) It is possible to reduce time and labor when arranging each layer on both sides of the plate. Further, by making a part of different types of materials into functional materials having a magnetic shielding function, for example, a function different from the vibration reduction effect can be added to the damping structure.

  The laminated damping structure according to claim 4 is the laminated damping structure according to any one of claims 1 to 3, wherein the restraining member is formed in a plate shape, and the damping layer and the plate material are The damping layer and the restraining member are joined.

  In the laminated damping structure according to claim 4, the restraining member is formed in a plate shape, and the damping layer and the plate material, and the damping layer and the restraining member are joined to each other to make the laminated damping structure a panel member that can be easily conveyed. Therefore, it can be used for various applications such as temporary enclosures, sound insulation walls, flooring materials, and ceiling materials.

  The laminated damping structure according to claim 5 is the laminated damping structure according to any one of claims 1 to 3, wherein the restraining member is slab concrete or wall concrete.

  According to the laminated vibration damping structure of the fifth aspect, by using a part of the structural member having damping performance as a restraining member, it is possible to reduce the laminated vibration damping structure member and reduce the manufacturing cost.

  According to the laminated damping structure according to the present invention, the damping layer can be made thinner as compared with the laminated damping structure in which the damping layer is one layer while ensuring the vibration reduction performance.

It is sectional drawing of the damping material to which the laminated damping structure which concerns on 1st Embodiment of this invention is applied. BRIEF DESCRIPTION OF THE DRAWINGS It is a cross-sectional schematic diagram explaining the effect of the damping material to which the laminated damping structure concerning 1st Embodiment of this invention is applied, (A) is the damping material which concerns on the comparative example by which the damping layer was made into one layer. (B) shows the shape before and after the deformation of the damping material according to the embodiment in which the damping layer is two layers, (C) is the outer surface of the damping layer than (B) The shape of the damping material which concerns on the Example in which the thickness of the restraining board which restrains was formed thin was shown, (D) is the deformation | transformation of the damping material which concerns on the Example from which the rigidity of (B) and a restraint board differs. The front and rear shapes are shown. It is sectional drawing which shows the slab to which the lamination | stacking damping structure which concerns on 2nd Embodiment of this invention was applied. It is a fragmentary sectional view which shows the flooring to which the lamination | stacking damping structure which concerns on 3rd Embodiment of this invention was applied. (A) shows a comparative steel plate without a damping layer, (B) shows a comparative damping steel plate with a single damping layer, and (C) shows two damping layers. The damping steel plate of the done Example is shown. It is a graph showing the damping performance test results for a steel plate, a damping steel plate with a single damping layer, and a damping steel plate with two damping layers, where the horizontal axis represents the frequency and the vertical axis represents the access frequency. Show tolerance. It is a graph which shows the damping performance test result of the damping steel plate with which the steel plate and the damping layer were made into two layers, a horizontal axis shows time and a vertical axis shows acceleration. It is a fragmentary sectional view showing the modification of the lamination damping structure concerning the embodiment of the present invention, and (A) shows the example which increased the number of layers of a damping layer rather than the damping material of a 1st embodiment, B) shows an example in which the number of damping layers is increased as compared with the damping material of the first embodiment, and the damping material itself is bridged over the beam as a slab, and (C) shows the damping layer of the second embodiment. And (D) shows an example in which the number of layers of the damping layer and the plate constituting the laminate of (C) is increased, and (E) shows the third embodiment. The state in which the floor material to which the laminated vibration damping structure of the form is applied is shown on the concrete, and (F) is an example in which the number of layers of the vibration damping material and the plate material constituting the floor material of (E) is increased. Show. It is a partial expanded sectional view which shows the laminated body in the laminated | stacked damping structure which concerns on 4th Embodiment of this invention. It is sectional drawing which shows the slab to which the laminated damping structure which concerns on 4th Embodiment of this invention was applied. It is sectional drawing which shows the ceiling to which the laminated damping structure which concerns on 5th Embodiment of this invention was applied. It is a graph which shows the result which replaced the arrangement | positioning of a sheet | seat material and a plywood board and compared the damping performance in the laminated damping structure which concerns on 4th Embodiment of this invention, a horizontal axis is a frequency and a vertical axis | shaft is an acceleration. Show. It is a graph which shows the result of having compared the damping performance of the sheet material used for the laminated damping structure concerning a 4th embodiment of the present invention, the damping material by an olefin system resin, and a foaming polyethylene sheet, and a horizontal axis shows each specimen. The vertical axis represents the vibration reduction effect and the natural frequency of the test specimen. It is a top view which shows the steel floor used for the damping performance test of the sheet material used for the laminated damping structure which concerns on 4th Embodiment of this invention. It is sectional drawing which shows the test body used for the damping performance test of the sheet material used for the laminated damping structure which concerns on 4th Embodiment of this invention, (A) concerns on the comparative example comprised only with the steel floor. A test body is shown, (B) shows a test body according to a comparative example in which a plywood board and a damping layer are arranged on a steel floor, and (C) shows a plywood board and a damping layer on a steel floor. (D) shows a test body according to an example in which four layers of plywood and vibration damping layers are alternately arranged on a steel floor. E) shows a test body according to an example in which eight layers of plywood and damping layers are alternately arranged on a steel floor. It is a graph which shows the damping performance test result of the sheet | seat material used for the laminated damping structure which concerns on 4th Embodiment of this invention, a horizontal axis shows a frequency and a vertical axis | shaft shows acceleration. It is a graph which compares the damping performance of the sheet material used for the laminated damping structure which concerns on 4th Embodiment of this invention, and a magnetic shield sheet material, A horizontal axis shows a frequency and a vertical axis | shaft shows an acceleration.

[First Embodiment]
As shown in FIG. 1, a vibration damping material 30 to which the laminated vibration damping structure of the first embodiment is applied is a laminated structure composed of a plate material 22 and two vibration damping layers 36 arranged on both surfaces of the plate material 22. A body 38 and two restraining plates 32 that are disposed on both sides of the laminated body 38 and restrain the outer surface of the laminated body 38.

  The plate material 22 is formed of a stainless steel plate and has higher rigidity than the vibration damping layer 36. The plate-like material for forming the plate material 22 includes, for example, a metal plate such as lead or aluminum, a wooden plate such as plywood, particle board, or MDF, a plaster board, a calcium silicate plate, a flexible board, etc. Non-combustible stone plates, fiber reinforced plastic plates such as glass fiber reinforced plastic (GFRP) and carbon fiber reinforced plastic (CFRP), and high hardness rubber plates can be used. I just need it.

  The damping layer 36 is formed of an elastomer molded into a sheet shape, and is bonded and fixed to the plate 22. The damping layer 36 has the same thickness as the plate 22. In addition, as an elastomer which forms the damping layer 36, natural rubber, synthetic rubber, urethane rubber, silicon rubber, fluorine rubber, or the like can be used. Also, polymer materials such as asphalt materials, nanocomposite gels and polymer hydrogels can be used instead of elastomers. By using a material having a large water content such as a nanocomposite gel or a polymer hydrogel, a heat resistance effect can be obtained.

  The constraining plate 32 is a stainless steel plate having the same thickness as that of the plate material 22, and is bonded and fixed to both surfaces of the laminated body 38, that is, the surface of the outer damping layer 36 constituting the laminated body 38. Thereby, the restraint plate 32 and the laminated body 38 constitute a panel-shaped damping material 30. In this embodiment, the constraining plate 32 has the same configuration as that of the plate material 22, but may be formed with a thickness different from that of the plate material 22 or may be a different material. As a material for forming the restraint plate 32, a material having higher rigidity than the vibration damping layer 36 may be used as in the case of the plate material 22. The restraining plate 32 is an example of a restraining member in the present invention.

  As an example, the method of manufacturing the damping material 30 is a plate material in which the damping layer 36 is placed after the adhesive is uniformly applied to the surface of the restraining plate 32, and the adhesive is applied to the surface of the damping layer 36. 22 is placed. Thereafter, the damping layer 36 and the constraining plate 32 are laminated while applying an adhesive in order, and finally, pressure is applied from both sides to fix them by pressure.

  In addition, each member does not need to be joined by adhesion | attachment. For example, the members may be laminated without using an adhesive, and the constraining plates 32 on the outside may be joined together using a tucker or rivet after the lamination, or the constraining plates 32 may be sandwiched between frame members after lamination. May be. That is, it is only necessary that the damping layer 36 and the plate material 22 and the damping layer 36 and the restraining plate 32 be joined so as not to be separated by any method.

  In the present embodiment, the damping layer 36 is formed of two sheet-like elastomers, but the embodiment of the present invention is not limited to this. For example, the plate material 22 is submerged in a resin material that is contained in a container and melted by applying heat, the plate material 22 is pulled up, the resin material is dropped by its own weight, and the resin material adhering to both surfaces of the plate material 22 is solidified at room temperature. Therefore, the vibration damping layer 36 may be formed. In this case, the damping layer 36 is formed so as to cover the entire plate 22.

  Further, as a method of forming a restraining member on the outer surface of the laminate 38 formed of the vibration damping layer 36 and the plate member 22, the laminate 38 is melted with a material having higher rigidity than the vibration damping layer 36 at room temperature. The constraining plate 32 may be formed by submerging in a liquid, pulling up the laminated body 38, and solidifying the material adhering to both surfaces of the laminated body 38 at room temperature. As described above, according to the manufacturing method in which the material is submerged in the molten material, the two damping layers 36 or the two constraining plates 32 can be formed at a time using the plate member 22 as a core member. High production efficiency.

  In the present embodiment, the laminated body 38 is provided with the two damping layers 36 on both surfaces of the single plate member 22, but the embodiment of the present invention is not limited to this. For example, as shown in FIG. 8A, the laminated body 38 can be configured by laminating a plurality of plate materials 22 and disposing the damping layer 36 between the plate materials 22.

(Action / Effect)
In the damping material 30 according to the first embodiment, the “damping layer 36 and the plate 22” and the “damping layer 36 and the restraining plate 32” are joined. For this reason, it does not fall apart during transportation. Therefore, the vibration damping material 30 can be used as a finishing material or a base material such as a building wall, a floor, or a ceiling, for example, and the vibration damping material 30 itself is a structural body such as a temporary enclosure at a construction site or a sound insulation wall of a highway. Can also be used. Or it can also press-process and use as body materials, such as a washing machine and a motor vehicle.

  The damping material 30 includes a material that has a weight, thickness, and size that can be lifted by human power, and that that needs to be suspended by a crane or the like. Therefore, for example, as shown in FIG. 8B, the damping material 30 itself can be configured as a slab and can be bridged over the beam 101.

  The vibration damping effect of the vibration damping material 30 according to the first embodiment will be described in comparison with the vibration damping material obtained by changing the number of vibration damping layers or the material of the plate material. Although details will be described below, the damping material 42 shown in FIG. 2A has a single damping layer 34, and the damping material 30 shown in FIG. Reference numeral 36 denotes two layers, and the plate member 22 is disposed between the damping layers 36. Further, the vibration damping material 48 shown in FIG. 2C includes a plate material 35 made of a material different from the plate material 22.

  In the following description, the damping layers 34 and 36 are elastomers, and the restraining plates 31 and 32 are stainless plates.

  FIG. 2A schematically shows the shapes before and after deformation when the damping material 42 is bent and deformed. When the bending deformation is input as vibration, the deformation shown in FIG. 2A and the deformation in the opposite direction are periodically repeated. The same applies to FIGS. 2B and 2C described later.

  The damping material 42 is a conventional damping material in which the damping layer 34 is a single layer and the restraining plates 32 are bonded to both surfaces of the damping layer 34.

  When the damping material 42 is bent and deformed, the upper and lower restraint plates 32 are deformed into substantially the same shape. For example, in the deformation in the direction shown in FIG. 2 (A), the restraining plate 32 is deformed to be expanded on the upper side of the neutral shaft 32A and contracted to be deformed on the lower side. At this time, following the deformation of the upper surface of the lower restraint plate 32, the lower surface of the damping layer 34 extends and deforms in the direction indicated by the arrow in the drawing. Further, following the deformation of the lower surface of the upper restraining plate 32, the upper surface of the damping layer 34 contracts and deforms in the direction indicated by the arrow in the drawing. That is, the damping layer 34 is shear-deformed with respect to the upper and lower restraint plates 32, and a vibration damping effect due to shear strain energy can be obtained. The shear strain at this time is defined as a strain amount ε1.

  FIG. 2B schematically shows the shapes before and after deformation when the vibration damping material 30 of the first embodiment is bent and deformed. In the damping material 30, the damping layer 36 is composed of two layers, and the plate material 22 is bonded between the two damping layers 36 to form a laminated body 38. Furthermore, the restraining plate 32 is bonded to both surfaces of the laminated body 38 to constitute the vibration damping material 30. The plate material 22 is made of the same material as that of the restraining plate 32, and the thickness of the damping layer 36 is half the thickness of the damping layer 34 used for the damping material 42. That is, the total thickness of the two damping layers 36 used for the damping material 30 is equal to the thickness of the one damping layer 34 used for the damping material 42.

  When the vibration damping material 30 is bent and deformed, the plate material 22 and the restraint plate 32 are deformed into substantially the same shape. For example, in the deformation in the direction shown in FIG. 2B, the upper side of the neutral shafts 22A and 32A is extended and deformed, and the lower side is contracted and deformed. At this time, following the deformation of the upper surface of the plate 22 and the upper surface of the constraining plate 32, the lower surfaces of the two vibration damping layers 36 extend and deform in the directions indicated by arrows in the drawing. Further, following the deformation of the lower surface of the plate member 22 and the lower surface of the restraining plate 32, the upper surfaces of the two vibration damping layers 36 are contracted and deformed in the directions indicated by arrows in the drawing. That is, shear strain is generated in the damping layer 36, and as a result, a vibration damping effect can be obtained. The shear strain at this time is defined as a strain amount ε2.

  Here, when the damping material 30 is compared with the damping material 42 described above, the damping material 30 has a damping layer 36 formed of two layers with the plate material 22 interposed therebetween, whereas the damping material 42 The vibration damping layer 34 is formed of a single layer. The total strain amount of the two damping layers 36, that is, the sum of the strain amounts (ε2 + ε2) is larger than the strain amount ε1 of the damping layer 34 in the damping material 42. More specifically, the strain amount ε2 of the damping layer 36 in the damping material 30 is substantially equal to the strain amount ε1 of the damping layer 34 in the damping material 42, and the sum of the strain amounts of the two damping layers 36. (Ε2 + ε2) is approximately twice the strain amount ε1 of the damping layer 34.

  For this reason, the vibration damping material 30 of the first embodiment has higher vibration reduction performance than the vibration damping material 42 having only one vibration damping layer 34 having a thickness equal to the total thickness of the vibration damping layers 36. Further, when equalizing the vibration reduction performance, the total thickness of the damping layer can be reduced when the damping layer has two layers than when the damping layer has one layer. That is, if the total number of damping layers is increased, the thickness of the laminated damping structure can be reduced while ensuring vibration reduction performance.

  FIG. 2C schematically shows the shapes before and after the deformation when the damping material 48, which is a modification of the first embodiment, is bent and deformed. The damping material 48 is sandwiched between the damping layer 36 in the damping material 30 shown in FIG. 2B in terms of the rigidity of the plate member 35 sandwiched between the damping layers 36 and the restraining method with the damping layer 36. Different from the plate material 22. As shown in FIG. 2 (C), the restraint plate and the plate material move relatively horizontally when bending deformation is applied to the damping material depending on the rigidity of the plate material and the restraining conditions of the damping layer for the restraining plate. (The distance indicated by σ3 in FIG. 2C). In this way, even if the restraint plate and the plate material are irregularly deformed, the damping layer is deformed and the vibration damping effect can be obtained.

[Second Embodiment]
As shown in FIG. 3, the laminated vibration damping structure of the second embodiment is applied to a deck slab 60 formed by placing concrete 62 on the top of a deck plate 58.
The deck slab 60 is composed of a corrugated deck plate 58 and a plate material 52 and two vibration damping layers 54 disposed on both surfaces of the plate material 52. A laminate 56 and concrete 62 placed on the laminate 56 are provided. The deck plate 58 and the concrete 62 are an example of a restraining member in the present invention.

  The deck plate 58 is a corrugated steel plate that has been rust-proofed by galvanization, and is spanned over the beams of the building to support the loads of the deck slab 60 and articles placed on the deck slab 60.

  The plate member 52 is formed of a stainless steel plate, and is cut into a strip shape so as to be disposed in a valley portion of the deck plate 58. The plate member 52 has higher rigidity than the vibration damping layer 54. In addition, the plate-shaped material which forms the board | plate material 52 can be made into the material similar to the board | plate material 22 of 1st Embodiment.

  The damping layer 54 is formed of an elastomer molded into a sheet shape, and is cut into a strip shape to be elongated in order to be disposed in a valley portion of the deck plate 58. As a material for forming the damping layer 54, the same material as that of the damping layer 36 of the first embodiment can be used.

  In FIG. 3, the plate material 52 and the vibration damping layer 54 are arranged without a gap with respect to the inner side surface 58 </ b> A of the deck plate 58, but the embodiment is not limited thereto, and is arranged with a gap in consideration of workability. can do.

  Alternatively, the damping material 54 may be formed so as to cover the entire plate material 52 by submerging the plate material 52 in a melted resin material and pulling it up to solidify the resin material adhering to both surfaces of the plate material 52 at room temperature. Good. A vibration damping effect can also be obtained by arranging the laminated body 56 formed in this way in the valleys of the deck plate 58.

  The construction method of the laminated vibration damping structure in the present embodiment is, for example, after the deck plate 58 is bridged over a beam of a building, and then the damping layer 54, the plate material 52, and the damping layer 54 in the valley portion of the deck plate 58. Are placed in order. At this time, the deck plate 58 and the vibration damping layer 54, and the plate member 52 and the vibration damping layer 54 can be brought into close contact with each other by the load of the concrete 62, and thus do not adhere to each other. Next, bar arrangement (not shown) is placed on the top of the deck plate 58, and concrete 62 is placed. In the case where the bars are pre-arranged in the deck plate 58 at a factory or the like, the arrangement work can be omitted.

(Action / Effect)
In the laminated vibration damping structure according to the second embodiment, the deck plate 58 and the concrete 62 constituting the deck slab 60 that is a vibration damping target are used as restraining members that restrain the outer surface of the damping layer 54. Since the deck plate 58 and the damping layer 54 and the plate member 52 and the damping layer 54 are in close contact with each other due to the load of the concrete 62, the outer surface of the damping layer 54 is restrained by the frictional force. For this reason, the effort which adhere | attaches the deck plate 58 and the damping layer 54 can be reduced, and the effort which adhere | attaches the board | plate material 52 and the damping layer 54 can be reduced.

  For example, when a heavy object falls on the deck slab 60 and vibration is applied, the deck slab 60 is slightly bent and deformed. The place where the bending deformation is greatest is a valley portion of the deck plate 58 farthest from the neutral axis 60A of the deck slab 60. In the present embodiment, the plate material 52, the damping layer 54, and the The laminated body 56 comprised by these is arrange | positioned. For this reason, the laminated vibration damping structure in the present embodiment can efficiently reduce vibrations and suppress the impact sound accompanying the fall of heavy objects from being transmitted downstairs.

  In the present embodiment, the laminated body 56 is disposed in the valley portion of the deck plate 58, but the embodiment of the present invention is not limited to this, and may be disposed in the mountain portion indicated by a dotted line in FIG. Alternatively, it may be arranged in a wave shape so as to follow the shape of the deck plate 58.

  In the laminated vibration damping structure according to the second embodiment, the laminated body 56 is sandwiched between the deck plate 58 and the concrete 62 as the restraining members, but the embodiment of the present invention is not limited thereto. For example, as shown in FIG. 8C, the laminate 56 may have a configuration in which both surfaces are sandwiched between concrete 62. As described above, the structure in which both surfaces of the laminated body 56 are sandwiched between the concrete 62 is applied to, for example, an equipment foundation in addition to a slab to reduce vibration of the equipment, or applied to a wall around the machine room and applied to the machine room. Noise can be reduced.

  Further, the configuration of the laminated body 56 is not limited to the configuration of the single plate material 52 and the two damping layers 54, and a plurality of the plate materials 52 are stacked as shown in FIG. A vibration damping layer 54 may be disposed between the two.

[Third Embodiment]
As shown in FIG. 4, the laminated vibration damping structure of the third embodiment is applied to a floor material 68 laid on a support leg 66 arranged on a concrete slab 64.

  The floor material 68 includes a base material 78 laid on the support leg 66 and a plate material 72 and two vibration damping layers 74 placed on both surfaces of the plate material 72. The laminated body 76 and the flooring material 80 placed on the laminated body 76 are provided. The base material 78 and the flooring material 80 are examples of the restraining member in the present invention.

  The plate material 72 is formed of a stainless steel plate, and the damping layer 74 is formed of an elastomer molded into a sheet shape. The plate material 72 and the damping layer 74 are each formed, for example, in a 500 mm square tile shape, and are spread on the construction site in the order of the damping layer 74, the plate material 72, and the damping layer 74 on the base material 78. The plate member 72 and the damping layer 74 may be bonded and integrated in advance at the factory, and the integrated laminate 76 may be spread on the base material 78 at the site.

  In addition, the plate-shaped material which forms the board | plate material 72 can be made into the material similar to the board | plate material 22 of 1st Embodiment. Moreover, the material which forms the damping layer 74 can be made into the material similar to the damping layer 36 of 1st Embodiment. That is, the vibration damping layer 74 only needs to have lower rigidity than the plate material 72, the base material 78, and the flooring material 80.

  Further, the shape and size of the plate material 72 and the damping layer 74 are not particularly limited, and may be, for example, a plate shape of about 900 mm × 1800 mm, or are cut into an indefinite shape in accordance with the planar shape of the double floor. Also good.

  The base material 78 is formed by using a particle board in which a small piece of wood is mixed with an adhesive and hot-press molded, and the surface is rough, and the frictional force with the vibration damping layer 74 placed on the upper part is low. Has been enhanced.

  The flooring material 80 is formed of a material such as solid wood, resin, a composite material in which wood is pasted on a resin surface, or cork. The flooring material 80 penetrates the laminated body 76 using screws 81 at regular intervals to form a base material 78. It is fixed. In addition, when floor heating is laid under the flooring material 80, or when the flooring material 80 is a tatami mat or a tile, a configuration in which the screw 81 is not used can be employed.

(Action / Effect)
The laminated vibration damping structure according to the third embodiment is applied to a double floor in which a floor material 68 is laid on a support leg 66 disposed on a concrete slab 64. For this reason, it can suppress that the noise generated on the upper floor is transmitted to the lower floor. In addition, since the vibration damping layer 74 having a lower rigidity (softer) than the flooring material 80 is laid under the flooring material 80, the burden on the legs and hips due to walking can be reduced, and the impact at the time of falling can be reduced. Can do.

  Although the laminated vibration damping structure is applied to a double floor, the embodiment of the present invention is not limited to this. For example, as shown in FIG. 8E, the base material 78 and the support legs 66 are omitted, and the present invention is applied to a configuration in which a laminated body 76 and a flooring material 80 are arranged on a slab 64 (so-called floor flooring). You can also In this case, the slab 64 becomes a restraining member.

  Further, the configuration of the laminated body 76 is not limited to the configuration of one plate material 72 and two vibration damping layers 74, and a plurality of plate materials 72 are stacked as shown in FIG. A vibration damping layer 74 may be disposed between the two.

[Fourth Embodiment]
In the laminated damping structure according to the fourth embodiment, as shown in FIG. 9, the laminated body 106 includes a plate material 102 and a damping layer 104. A restraining member that restrains the stacked body 106 from above and below will be described later.

  Each damping layer 104 is formed by stacking three layers of a sheet material 108 formed by bonding a resin layer 108B mainly composed of polyethylene with an adhesive on both surfaces of a core base paper 108A containing cellulose fibers. Has been. Both sides of the sheet material 108 are formed with unevenness, and the frictional force between the sheet materials 108 adjacent to each other in the vertical direction is enhanced. The plate material 102 is a plywood (JAS ordinary plywood). The sheet material 108 is a general-purpose product used as a curing sheet at a construction site or the like.

  The laminated body 106 is arrange | positioned between the CLT slab 110 and the top concrete 112, as shown in FIG. More specifically, as shown in FIG. 10 with an enlarged portion indicated by a dotted box, a plate member 102 as a restraining member is placed on the CLT slab 110, and a laminated body 106 (seven sheets) is placed on the plate member 102. A laminated body in which damping layers 104 are arranged on both surfaces of the plate member 102 is placed, and a top concrete 112 as a restraining member is placed on the laminated body 106. In addition, what combined these CLT slab 110, the top concrete 112, and the laminated body 106 is called the slab 100 in the following description. The plate member 102 placed on the CLT slab 110 can be omitted. In this case, the CLT slab 110 functions as a restraining member.

(Action / Effect)
In the laminated damping structure according to the fourth embodiment, the damping layer 104 is formed by laminating a plurality of sheets (three layers) of sheet materials 108, respectively. For this reason, when the bending vibration mode acts on the slab 100, the sheet materials 108 in the damping layer 104 are deformed in a shearing manner. For this reason, the vibration damping effect is enhanced as compared with the case where each damping layer 104 is formed of a single-layer sheet material 108.

  Further, the sheet material 108 is configured by bonding the resin 108B on both surfaces of the core base paper 108A. For this reason, when the bending vibration mode acts on the slab 100, the core base paper 108A and the resin layer 108B (see FIG. 9) in the sheet material 108 are shear-deformed. For this reason, the vibration damping effect is enhanced as compared with the case where each sheet material 108 is formed of a single material.

  In the present embodiment, each damping layer 104 includes three layers of the sheet material 108. However, the embodiment of the present invention is not limited to this, and may be two layers or less or four layers or more. For example, even in the case of a single layer, if the sheet material 108 is composed of a plurality of layers by the core base paper 108A and the resin layer 108B, the sheet material 108 is compared with a damping layer formed of a single material as a single layer. The vibration damping effect can be enhanced.

  Further, although the sheet material 108 is configured by bonding the resin layers 108B to both surfaces of the core base paper 108A with an adhesive, the configuration of the present invention is not limited thereto. For example, the core base paper 108A may be coated (laminated) with the resin layer 108B by immersing the core base paper 108A in a liquid resin or by drying after applying a liquid resin. In this way, no adhesive is required. Furthermore, the resin layer 108B may be bonded only to one side of the core base paper 108A, not to both sides.

  Further, if each damping layer 104 is formed of two or more sheet materials 108, each sheet material 108 may be formed of a single material. Even in this case, the vibration damping effect can be enhanced as compared with a damping layer formed of a single material as a single layer.

  In addition, the structure of the damping layer 104 in this embodiment is applicable also in the 1st-3rd embodiment. Moreover, the damping layers 36, 54, and 74 in the first to third embodiments can be applied as the damping layer 104 in the present embodiment.

[Fifth Embodiment]
In the laminated vibration damping structure according to the fifth embodiment, as shown in FIG. 11, the laminated body 126 includes a plate material 122 and a vibration damping layer 124. The structure of the damping layer 124 is the same as that of the damping layer 104 shown in FIG. Similarly, the configuration of the plate material 122 is the same as the configuration of the plate material 102 shown in FIG.

  The laminated body 126 is disposed between the base plate 132 fixed to the field edge 134 on the ceiling 120 formed with a gap from the slab 121 and the gypsum board 130. More specifically, a base plate 132 as a restraining member is fixed to the field edge 134, and a laminated body 126 (a vibration damping layer 124 is disposed on each side of the two plate members 122 is formed below the base plate 132. The gypsum board 130 as a restraining member is fixed below the laminated body 126. In the construction of the laminated body 126, the plate material 122 and the damping layer 124 are laminated while being temporarily fixed with a tucker or the like, and then the plate material 122 and the damping layer 124 are integrally formed on the base plate 132 or the field edge 134 using screws. Fix it.

  In the present embodiment, the base plate 132 is used as a restraining member, but the embodiment of the present invention is not limited to this. For example, the laminated body 126 may be directly fixed to the field edge 134 without providing the base plate 132. In this case, the field edge 134 functions as a restraining member. As described above, the restraining member does not necessarily have a plate-like configuration, and may be any member that restrains the outer surface of the damping layer entirely or partially by a material having higher rigidity than the damping layer.

(Action / Effect)
According to the laminated vibration damping structure according to the fifth embodiment, the laminated body 126 is installed on the ceiling 120 formed with a gap from the slab 121. Thereby, it can suppress that the noise which generate | occur | produced on the upper floor by the resonance of the air of the clearance gap between the slab 121 and the ceiling 120 is transmitted to a lower floor. Note that the number of stacked plate members 122 in the stacked body 126 can be appropriately adjusted according to, for example, the resonance frequency.

  In the present embodiment, the laminated body 126 is installed on the ceiling 120 formed with a gap from the slab 121. However, the embodiment of the present invention is not limited to this and may be directly fixed to the slab 121. .

[performance test]
In order to verify the vibration damping effect of the laminated damping structure according to the embodiment of the present invention, the following tests (first test to fifth test) were performed.

  In the first test, first, a steel plate 90, a damping steel plate 92, and a damping steel plate 94 are prepared. The damping steel plate 94 is an example of an embodiment of the present invention, and the steel plate 90 and the damping steel plate 92 are comparative examples. As shown in FIG. 5A, the steel plate 90 is a stainless steel plate having a thickness of 0.8 mm, a short side length of 100 mm, and a long side length of 200 mm. Further, as shown in FIG. 5B, the damping steel plate 92 is formed by bonding a 0.4 mm thick stainless steel restraint plate 82 to both sides of a 0.6 mm thick damping layer 84. The vibration damping material has a side length of 100 mm and a long side length of 200 mm. Further, as shown in FIG. 5C, the damping steel plate 94 has three layers of damping layers 36 and two stainless steel plates 22 disposed between the damping layers 36, respectively. And a stainless steel restraining plate 32 bonded to both surfaces of the laminated body 38. The damping layer 36, the plate material 22, and the restraint plate 32 are each 0.2 mm thick, 100 mm short side length, and 200 mm long side length. The damping layers 36 and 84 are both made of an elastomer.

Next, one short side of each test piece was fixed to be in a cantilever state, an acceleration sensor was installed near the other short side, and the vicinity thereof was hit with an impulse hammer. Then, acceleration [m / s ² ] and excitation force [N] generated at that time were measured, and acceleration [(m / s ² ) / N] was calculated. As the acceleration value is smaller, the acceleration generated in the test piece is smaller with respect to the excitation force, so the vibration reducing effect is higher.

In the graph of FIG. 6, the relationship between the frequency [Hz] and the acceleration [(m / s ² ) / N] is shown for each of the steel plate 90, the damping steel plate 92, and the damping steel plate 94. In FIG. 6, the steel plate 90 is indicated by a one-dot chain line A, the damping steel plate 92 is indicated by a dotted line B, and the damping steel plate 94 is indicated by a solid line C. In the frequency range shown in FIG. 6, the maximum values of the acceleration are about 60 [(m / s ² ) / N] and 7.5 [(m) for the steel plate 90, the damping steel plate 92, and the damping steel plate 94, respectively. / S ² ) / N], 4.5 [(m / s ² ) / N], and the damping steel plate 94 has the highest vibration reduction effect.

In the first test, the time-dependent change in acceleration [m / s ² ] generated by hitting each test piece with an impulse hammer was measured. In the graph of FIG. 7, the relationship between acceleration [m / s ² ] and time [second] is shown for each steel plate 90 and damping steel plate 94. In FIG. 7, the steel plate 90 is indicated by a one-dot chain line A, and the damping steel plate 94 is indicated by a solid line C. As shown in FIG. 7, the damping steel plate 94 has a smaller maximum acceleration value and faster attenuation than the steel plate 90.

  As described above, according to the laminated damping structure according to the embodiment of the present invention, a high vibration reduction effect can be obtained as compared with the laminated damping structure in which the damping material is a single layer. In addition, the vibration damping layer can be made thinner compared to a laminated vibration damping structure in which the vibration damping layer is a single layer while ensuring vibration reduction performance.

  Next, in the second test, the vibration reduction effects of the test bodies 2A, 2B, 2C, and 2D were compared. Here, the test body 2A is a particle board having a short side of 300 mm, a long side of 900 mm, and a thickness of 20 mm, which is a comparative example in this test.

  The test body 2B has three layers of the sheet material 108 having a thickness of 0.15 mm in the fourth embodiment (the vibration damping layer 104 in FIG. 9) and a veneer board having a thickness of 4 mm (JAS ordinary plywood) on the same particle board as the test body 2A. ) Is a laminated damping structure in which 8 layers (ie, (3 layers + 1 layer) × 8 sets) are laminated.

  The test body 2C is a laminated vibration damping structure in which two sets (that is, (12 layers + 4 layers) × 2 sets) obtained by laminating 12 layers of sheet material 108 and 4 layers of plywood on a particle board are stacked. is there.

  The test body 2D is a laminated damping structure in which 24 layers of sheet material 108 and 8 layers of plywood are laminated on a particle board (that is, (24 layers + 8 layers) × 1 set).

  In the test bodies 2B, 2C, and 2D, the number of laminated sheet materials 108 and the total number of veneer plates are the same, but the number of sheet materials 108 sandwiched between the veneer plates is small in the order of the test bodies 2B, 2C, and 2D. .

Both end portions of these test bodies 2A, 2B, 2C, and 2D were supported by support legs, an acceleration sensor was installed on the back surface of the center portion, and the surface of the center portion was hit with an impulse hammer. Then, acceleration [m / s ² ] and excitation force [N] generated at that time were measured, and acceleration [(m / s ² ) / N] was calculated.

  As shown in FIG. 12, the specimens 2B, 2C, and 2D using the sheet material 108 have a small peak acceleration value and a high vibration reduction effect compared to the specimen 2A that does not use the sheet material 108. I understand that. Further, when the test body 2B is compared with the test bodies 2C and 2D, the test body 2B having a smaller number of unit sheets of the sheet material 108 sandwiched between the veneer plates has a smaller acceleration peak value and a higher vibration reduction effect. .

  Next, in the third test, the vibration reduction effects of the specimens 3A, 3B, 3C, 3D, 3E, and 3F were compared. Here, the test body 3A is a particle board having a short side of 300 mm, a long side of 900 mm, and a thickness of 20 mm, similar to the test body 2A in the second test, and is a comparative example in this test.

  The test body 3B is a comparative example in which four sets of one layer of a damping material formed of an olefin resin having a thickness of 1 mm and one layer of a veneer plate having a thickness of 4 mm are stacked.

  The test body 3C includes four sets (that is, (3 (3)) of three layers of the sheet material 108 having a thickness of 0.15 mm (damping layer 104 in FIG. 9) and one layer of a 4 mm thick plywood (JAS ordinary plywood). Layer + 1 layer) × 4 sets) A laminated vibration damping structure.

  The test body 3D is a laminated vibration damping structure in which seven sets (that is, (3 layers + 1 layer) × 7 sets) obtained by laminating three layers of sheet material 108 and one layer of plywood are stacked.

  The test body 3E is a comparative example in which four sets (that is, (3 layers + 1 layer) × 4 sets) in which three layers of a foamed polyethylene sheet having a thickness of 1.5 mm and one layer of a plywood plate are laminated. The foamed polyethylene sheet is a general-purpose product used as a curing sheet at a construction site or the like, like the sheet material 108.

  The test body 3F is a comparative example in which seven sets (that is, (3 layers + 1 layer) × 7 sets) in which three layers of a foamed polyethylene sheet and one layer of a plywood plate are laminated are stacked.

  About these test bodies 3A, 3B, 3C, 3D, 3E, and 3F, the same test as the 2nd test was done. FIG. 13 is a line graph showing the natural frequencies of the test specimens 3A, 3B, 3C, 3D, 3E, and 3F, and the vibration reduction effects (respective test specimens 3A, 3B, 3C, 3D, 3E, and 3F). The bar graph shows the value obtained by subtracting the peak value of the acceleration in the specimen 3A from the peak value of the acceleration in FIG.

  As shown in the bar graph of FIG. 13, it can be seen that the test bodies 3C and 3D using the sheet material 108 have a vibration reducing effect as compared with the test body 3A not using the sheet material 108. In addition, the test bodies 3C and 3D using the sheet material 108 have a higher vibration reduction effect than the test bodies 3E and 3F using a foamed polyethylene sheet having a thickness of 1.5 mm instead of the sheet material 108. Further, the test body 3C using the sheet material 108 has substantially the same vibration reducing effect as the test body 3B using an olefin resin having a thickness of 1 mm instead of the sheet material 108. Since the thickness of the sheet material 108 is 0.15 mm per sheet, when the specimen 3B and the specimen 3C are compared, the specimen 3C can exhibit the same vibration reducing effect with a smaller thickness.

  Next, in the fourth test, the vibration reduction effects of the test specimens 4A, 4B, 4C, 4D, and 4E were compared. Here, the test body 4A has a thickness of 3.2 mm and is laid on a substantially horizontal surface formed by a steel beam 140 shown in FIG. 14 and a steel beam 142 installed on the beam 140. It is a steel floor 144. The plane dimension of the steel floor is about 2400 mm in the X direction and about 6300 mm in the Y direction shown in FIG.

  As shown in FIG. 15B, the test body 4B has a veneer plate 146 having a thickness of 2.4 mm placed on a steel floor 144, and a damping layer 104 (a sheet material having a thickness of 0.15 mm) on the veneer plate 146. 3 is a comparative example in which a particle board 148 having a thickness of 20 mm is placed on the damping layer 104.

  As shown in FIG. 15C, the test body 4C is a laminated vibration damping structure in which two sets of laminated veneer plates 146 and vibration damping layers 104 are stacked on a steel floor 144.

  The test body 4D is a laminated vibration damping structure in which four sets of laminated veneer plates 146 and damping layers 104 are stacked on a steel floor 144 as shown in FIG. 15 (D).

  The test body 4E is a laminated damping structure in which eight sets of laminated veneer plates 146 and damping layers 104 are stacked on a steel floor 144 as shown in FIG. 15 (E).

With respect to these test bodies 4A, 4B, 4C, 4D, and 4E, rubber balls were freely dropped from predetermined positions. Then, acceleration [m / s ² ] and excitation force [N] generated at that time were measured, and acceleration [(m / s ² ) / N] was calculated.

  As shown in FIG. 16, the specimens 4B, 4C, 4D, and 4E using the damping layer 104 (three-layer sheet material 108) have a vibration reduction effect as compared with the specimen 4A that does not include the damping layer 104. I understand that there is. Moreover, when comparing each of the test bodies 4B, 4C, 4D, and 4E, it can be seen that the higher the total number of the damping layers 104, the higher the vibration reduction effect.

  In the present embodiment, the sheet material 108 is obtained by bonding the resin layers 108B mainly composed of polyethylene to both surfaces of the core base paper 108A containing cellulose fibers. However, the embodiment of the present invention is not limited thereto. Absent. For example, an amorphous metal ribbon may be used instead of the core base paper 108A, and polyethylene terephthalate (PET) may be used as the resin layer 108B instead of polyethylene (PE). By using such a magnetic shield sheet material, in addition to the vibration damping effect due to shear deformation, a magnetic shield effect can be obtained.

  In order to compare the vibration damping effect of the sheet material 108 using the core raw paper and PE and the magnetic shield sheet material using amorphous metal ribbon and PET, a fifth test was performed.

  In the fifth test, the vibration reduction effects of the test specimens 5A, 5B, 5C, 5D, 5E, and 5F were compared. Here, the test body 5A is a particle board having a short side of 300 mm, a long side of 900 mm, and a thickness of 20 mm similar to the test body 2A in the second test, and is a comparative example in the present test.

  The test body 5B is composed of three layers of 0.15 mm thick sheet material 108 (damping layer 104 in FIG. 9) and one layer of 4 mm thick plywood (JAS ordinary plywood) on the same particle board as the test body 5A. The laminated vibration damping structure.

  The test body 5C has four sets of three layers of the sheet material 108 (damping layer 104 in FIG. 9) and one layer of plywood on the particle board (that is, (3 layers + 1 layer) × 4 sets). It is a laminated laminated damping structure.

  The test body 5D is a laminated vibration damping structure using a magnetic shield sheet material instead of the sheet material 108 of the test body 5B.

  The test body 5E is a laminated vibration damping structure using a magnetic shield sheet material instead of the sheet material 108 of the test body 5C.

  The test body 5F is a laminated vibration damping structure in which three layers of sheet material 108 and one layer of plywood are laminated on a particle board, and three layers of magnetic shield sheet material and one layer of plywood are laminated.

Both end portions of these test specimens 5A, 5B, 5C, 5D, 5E, and 5F were supported by support legs, an acceleration sensor was installed on the back surface of the central portion, and the surface of the central portion was hit with an impulse hammer. Then, acceleration [m / s ² ] and excitation force [N] generated at that time were measured, and acceleration [(m / s ² ) / N] was calculated.

  As shown in FIG. 17, the test bodies 5D and 5E using the magnetic shield sheet material instead of the sheet material 108 (both indicated by the one-dot chain line) are provided with neither the sheet material 108 nor the magnetic shield sheet material. It can be seen that the peak value of the acceleration is small compared with 5A (dotted line), and the vibration reducing effect is high.

  Moreover, the vibration reduction effect of the test body 5B (solid line) using the sheet material 108 and the test body 5D (single-dot chain line) using the magnetic shield sheet material instead of the sheet material 108 are similar. In addition, the vibration reduction effect of the test body 5C (solid line) using the sheet material 108 and the test body 5E (one-dot chain line) using the magnetic shield sheet material instead of the sheet material 108 are approximate.

  Further, the vibration reduction effect of the test body 5F using the sheet material 108 and the magnetic shield sheet material in combination is compared with the test body 5C using only the sheet material 108 or the test body 5E using only the magnetic shield sheet material. Therefore, the vibration reduction effect is approximate.

  According to the fifth test using these specimens 5A, 5B, 5C, 5D, 5E, and 5F, the magnetic shield sheet material using the amorphous metal ribbon and the PET is the sheet material 108 using the core raw paper and PE. It was found that it has a vibration reduction effect that is not inferior to the comparison.

22, 52, 72, 102 Plate material 36, 54, 74, 104 Damping layer 33, 38, 56, 76, 106 Laminate 28 Restraint member 31, 32, 35 Restraint plate (restraint member)
30, 46, 48 Damping material (Laminated damping structure)
58 Deck plate (restraint member)
60 deck slab (laminated vibration control structure)
62 Concrete (restraint member)
68 Flooring (laminated vibration control structure)
78 Base material (restraint member)
80 Flooring material (restraint member)
112 Top concrete (restraint member)
130 Gypsum board (restraint member)
132 Base plate (restraint member)
134 Field edge (restraint member)
146 Plywood (restraint member)
148 Particle Board (restraint member)

Claims (5)

a laminate in which vibration damping layers softer than the plate material are laminated on both surfaces of the n plate materials;
A constraining member for constraining the outer surface of the damping layer;
A laminated vibration damping structure.   The laminated damping structure according to claim 1, wherein each of the damping layers includes a plurality of layers.   The laminated vibration damping structure according to claim 2, wherein each of the plurality of layers is formed of a sheet material in which different types of materials are bonded to each other.   The said restraining member is formed in plate shape, the said damping layer and the said board | plate material are joined, The said damping layer and the said restraining member are joined in any one of Claims 1-3. The laminated damping structure described.   The laminated damping structure according to any one of claims 1 to 3, wherein the restraining member is slab concrete or wall concrete.