JP2010053559A - Floor structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a floor structure with high sound insulation on which walkers can have superior sensation of walking and capable of smoothly absorbing the noise in a frequency range of approximately 125-500 Hz which is produced , in accompaniment of the walking of walkers thereon. <P>SOLUTION: In this floor structure A, a sound insulation floor substrate 3 is disposed between a foundation 1 and a floor member 2. The sound insulation floor substrate 3 includes a foam sheet 31, in which through-holes 31a extending between the upper and lower surfaces thereof are formed and a nonwoven fabric 32, laminated on at least one of the upper and lower surfaces of the foam sheet 31. Consequently, the floor structure can stably support the walkers, while it absorbs impacts, when the walkers walk thereon without making the floor member 2 sink excessively, when the walkers walk on the floor member 2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a floor structure excellent in soundproofing performance against impact sound in a frequency range of about 125 to 500 Hz.

  Soundproof floors are widely used as public facilities such as music rooms, gymnasiums, libraries, and residential floors such as apartment houses because they can block noise. As a soundproof floor, a nonwoven fabric laid between a base such as a floor slab and a floor material, or a nonwoven fabric sheet and a buffer sheet are sequentially laminated on the back surface of a floor material substrate as proposed in Patent Document 1. In addition, there is disclosed a soundproof floor material, etc., in which a buffer sheet is made of a foamed sheet obtained by adding ethylene-vinyl acetate copolymer to polyethylene and foaming.

  However, when a non-woven fabric is laid on the floor as a soundproof floor, the non-woven fabric is easily compressed in the thickness direction due to the weight of the pedestrian, resulting in the sinking of the floor material and balance of the pedestrian. It had the problem that it was difficult to walk because it collapsed.

  In recent years, it has also been desired to reduce the thickness of the soundproofing floor with the aim of obtaining a large indoor space. In such a case, the flooring material tends to bend due to the weight of the pedestrian, and the flooring material may sink. There was also concern about becoming larger.

  Furthermore, although the soundproofing floor material proposed in Patent Document 1 has the advantage that there is less sinking due to walking as described above, the thickness of the soundproofing floor can be made much thicker in order to secure indoor space. Since there is a situation that cannot be performed, the thickness of the non-woven fabric has to be reduced by the amount of interposition of the buffer sheet, and as a result, the soundproof performance of the soundproof floor is lowered.

Japanese Utility Model Publication No. 6-001589

  The present invention provides a floor structure excellent in soundproofing performance that is excellent in a pedestrian's walking feeling and can smoothly absorb an impact sound in a frequency range of about 125 to 500 Hz that is generated when the pedestrian walks.

  The floor structure of the present invention is a floor structure in which a soundproof floor base material is disposed between a base and a floor material, and the soundproof floor base material is a foam in which a through-hole penetrating between upper and lower surfaces is formed. It consists of a sheet | seat and the nonwoven fabric laminated | stacked on at least one of the upper and lower surfaces of this foam sheet.

  In the floor structure, the nonwoven fabric is inserted into the through hole of the foam sheet.

  Further, in the floor structure, the nonwoven fabric is inserted so as to fill a part of the through hole in the through hole of the foam sheet, and the nonwoven fabric insertion layer and the air layer are formed in the through hole. And

  And in the said floor structure, the nonwoven fabric is laminated | stacked on the upper and lower surfaces of the foam sheet, It is characterized by the above-mentioned.

  The floor structure of the present invention is a floor structure in which a soundproof floor base material is disposed between a base and a floor material, and the soundproof floor base material is a foam in which a through-hole penetrating between upper and lower surfaces is formed. Since it is composed of a sheet and a nonwoven fabric laminated on at least one of the upper and lower surfaces of this foamed sheet, it absorbs the impact during walking without excessively sinking the flooring when walking on the flooring. While being able to catch a pedestrian stably, it has an excellent feeling of walking.

  Furthermore, in the floor structure of the present invention, since the through-hole is formed in the foamed sheet, the nonwoven fabric portion laminated on the through-hole of the foamed sheet is not compressed, and the original soundproof performance of the nonwoven fabric is maintained. Therefore, the impact sound propagated from the flooring material is smoothly absorbed by the entire nonwoven fabric including the portion compressed around the uncompressed portion, and exhibits excellent soundproofing performance.

  And in the said floor structure, when the nonwoven fabric is inserted in the through-hole of a foam sheet, without affecting the feeling of walking on the flooring and the thickness of the floor structure, the increase of the uncompressed nonwoven fabric is increased. As a result, the soundproofing performance can be improved.

  Further, in the above floor structure, when the nonwoven fabric is inserted so as to partially fill the through hole of the foam sheet, and the nonwoven fabric insertion layer and the air layer are formed in the through hole, The soundproof performance of the structure can be improved and the floor structure can be reduced in weight.

  Furthermore, in the said floor structure, when the nonwoven fabric is laminated | stacked on the upper and lower surfaces of a foam sheet, the soundproof performance of a floor structure can be improved more.

  An example of the floor structure of the present invention will be described with reference to the drawings. In the floor structure A, as shown in FIGS. 1 and 2, a soundproof floor base material 3 is disposed between a base 1 such as a floor slab and a floor material 2 disposed on the base 1. ing. In addition, the thickness of the flooring 2 is preferably 1 to 10 mm.

  The soundproof floor base material 3 includes a foam sheet 31 having a certain thickness and a nonwoven fabric 32 laminated on the top surface of the foam sheet 31. As shown in FIGS. 2 and 3, the entire surface of the foam sheet 31 has a plurality of planar perfect circular through holes 31 a, 31 a. Formed at regular intervals.

  The cross-sectional shape of the through-hole 31a along the plane direction of the foam sheet 31 may be, for example, an elliptical shape, a polygonal shape, a star shape, a corrugated shape, a linear shape, or a cross shape in addition to a perfect circular shape. Further, as shown in FIG. 4, for example, a plurality of through-holes 31a, 31a are formed in each of a plurality of virtual perfect circles 310 drawn in a grid pattern on the foamed sheet 31 at regular intervals. An aggregate of fine through holes formed by. In addition, the aggregate | assembly of several through-holes may be scattered in the plane.

And if the opening area of each through-hole 31a is small, the impact sound in the frequency region near 500 Hz may not be smoothly absorbed by the uncompressed nonwoven fabric, and if large, the mechanical strength of the foam sheet is low. Since it may fall, 0.5-60 cm < ² > is preferable and 0.5-60 cm < ² > is more preferable.

Further, if the opening ratio of the through-hole 31a to the foam sheet 31 is small, the impact sound in the frequency region near 500 Hz may not be smoothly absorbed by the uncompressed nonwoven fabric. Strength may decrease. Therefore, preferably 70 to 90% when the upper end opening area of the through holes 31a is less than 1 cm ^2, the upper end opening area of the through-holes 31a is preferably 30 to 80% in the case of 1 cm ² or more. The opening ratio of the through holes 31a to the foam sheet 31 is a value obtained by dividing the sum of the upper end opening areas of all the through holes 31a, 31a,. Say.

  The foam sheet 31 receives pressure generated by walking on the flooring 2 so that the flooring 2 does not sink. The foam sheet 31 may be either a closed cell foam sheet or an open cell foam sheet. When a strong repulsive force is expected, a closed cell foam sheet is preferable. In the case where high sound absorption performance is expected, a foam sheet in which closed cells and open cells are mixed is preferable. As the foamed sheet in which closed cells and open cells are mixed, for example, a foamed sheet subjected to so-called perforation processing, in which a plurality of closed cells existing in the closed cell foamed sheet are perforated with long needles to change to open cells. Is mentioned. The foam sheet 31 is preferably made of a polyolefin resin such as a polyethylene resin or a polypropylene resin. The expansion ratio of the foam sheet 31 is preferably 5 to 35 times, more preferably 10 to 20 times.

  A plurality of grooves or irregularities may be formed on one or both of the upper and lower surfaces of the foam sheet 31. Thereby, the non-compressed nonwoven fabric part can be arranged not only on the through hole 31a of the foam sheet 31, but also in the groove part or the uneven part of the foam sheet 31. Therefore, the non-compressed nonwoven fabric portion can be distributed evenly on the foamed sheet 31, and the impact sound in a wide frequency range from the flooring can be more reliably absorbed.

  The foam sheet 31 is disposed on the base 1 in a state in which the lower surface thereof is in direct contact with the upper surface of the base 1 entirely. Other members such as non-woven fabric are not interposed between the foam sheet 31 and the base 1, and the irregularities formed on the upper surface of the base 1 are absorbed by the deformation of the lower surface of the foam sheet 31, The foam sheet 31 is stably disposed on the base 1.

  Further, as shown in FIGS. 1 and 2, the soundproof floor base material 3 is formed by laminating a non-woven fabric 32 over the entire top surface of the foam sheet 31. That is, the non-woven fabric 32 is filled between the facing surfaces of the flooring 2 and the foamed sheet 31 in a slightly compressed state in the thickness direction. The portion of the nonwoven fabric 32 laminated on the through hole 31a of the foam sheet 31 is not compressed. The nonwoven fabric 32 may be a single layer or multiple layers. Further, a single nonwoven fabric or a plurality of nonwoven fabrics may be laminated on the foam sheet 31.

  The nonwoven fabric 32 and the foam sheet 31 may be integrated by an adhesive or the like, but when the nonwoven fabric 32 and the foam sheet 31 are integrated by an adhesive or the like, in the vicinity of the interface between the nonwoven fabric 32 and the foam sheet 31 The fibers constituting the non-woven fabric 32 are fixed by an adhesive or the like, and the soundproofing performance of the non-woven fabric 32 is reduced. Therefore, the non-woven fabric 32 and the foamed sheet 31 do not use an adhesive or the like. It is preferable that the nonwoven fabric is laminated | stacked on.

  The nonwoven fabric 32 is not particularly limited, and examples thereof include a nonwoven fabric obtained by entanglement of a polyolefin resin fiber such as a polypropylene resin fiber and a polyethylene resin fiber, and a synthetic resin fiber such as a polyester resin fiber.

  A part of the nonwoven fabric 32 is inserted and filled into the upper part of the through hole 31a of the foam sheet 31 to form a nonwoven fabric insertion layer 31b, and the through hole 31a portion where the nonwoven fabric is not inserted and filled, that is, the penetration An air layer 31c is formed in the remaining portion of the hole 31a excluding the nonwoven fabric insertion layer 31b.

  When walking on the floor material 2 of the floor structure A configured as described above, an impact sound is generated when a pedestrian puts his / her foot on the floor material 2. The impact sound is approximately in the frequency region of 125 to 500 Hz, the foam sheet 31 mainly absorbs the impact sound in the frequency region of about 125 to 250 Hz, and the nonwoven fabric 32 is in the frequency region of the center frequency of 500 Hz. It mainly absorbs impact sounds. The nonwoven fabric absorbs the impact sound by converting it into thermal energy when the fibers constituting the nonwoven fabric vibrate. The non-compressed non-woven fabric 32 part can move freely compared to the non-woven fabric 32 part arranged in a compressed state, and the impact sound in the frequency region with a center frequency of 500 Hz can be converted into thermal energy more efficiently. Can be converted.

  However, in the floor structure A of the present invention, of the impact sound transmitted from the floor material 2, the impact sound in the frequency region having a center frequency of 500 Hz is absorbed even in the compressed nonwoven fabric 32 part. It is more efficiently absorbed by the non-compressed non-woven fabric 32 part.

  Moreover, in the floor structure A of the present invention, the nonwoven fabric is inserted into the through-hole 31a of the foam sheet 31 to form the nonwoven fabric insertion layer 31b, and the amount of the nonwoven fabric contained in the floor structure A is set to the thickness of the floor structure A. The amount is increased without increasing, and even in this nonwoven fabric insertion layer 31b, the impact sound in the frequency region having a center frequency of 500 Hz is absorbed by being smoothly converted into thermal energy.

  In the through hole 31a of the foam sheet 31, an air layer 31c is formed below the nonwoven fabric insertion layer 31b, and the frequency incident on the foam sheet from the wall surface of the through hole 31a via the air layer 31c is about The impact sound in the frequency region of 125 to 250 Hz is smoothly absorbed by the foam sheet 31.

  Further, in the floor structure A of the present invention, among the impact sounds transmitted from the floor material 2, the impact sound having a center frequency in the frequency region of 500 Hz is not compressed as described above, and the nonwoven fabric 32 portion and the nonwoven fabric insertion layer 31b are not compressed. While the sound is smoothly absorbed in the center, the impact sound that is not absorbed by the nonwoven fabric 32, that is, the impact sound having a center frequency in the frequency range of about 125 to 250 Hz, is smoothly absorbed by the foam sheet 31.

  The foam sheet 31 has through-holes 31a, and the impact sound that reaches the foam sheet 31 from the flooring 2 through the nonwoven fabric 32 is not only the upper surface of the foam sheet 31, but also the inner wall surface that forms the through-hole 31a. The impact sound in the frequency range of about 125 to 250 Hz is smoothly converted to thermal energy by vibrating the bubble wall of the foam sheet 31 and absorbed.

  As described above, in the floor structure A of the present invention, the impact sound in the frequency region of 500 Hz centering on the uncompressed nonwoven fabric 32 portion and the nonwoven fabric insertion layer 31b is smoothly absorbed, and the through hole 31a is formed. By the foam sheet 31 having a large surface area, the impact sound in the frequency range of about 125 to 250 Hz is smoothly absorbed, and the floor structure A of the present invention absorbs the impact sound in the frequency range of about 125 to 500 Hz generated during walking. It has excellent soundproofing performance.

  The nonwoven fabric is inserted into the through-hole 31a of the foam sheet 31 to form the nonwoven fabric insertion layer 31b, and the soundproof performance is improved without increasing the overall thickness of the floor structure A, and the soundproof performance is reduced. It is also possible to secure the indoor space by reducing the thickness of the floor structure A.

  Further, the nonwoven fabric insertion layer 31b is formed only in the upper portion of the through hole 31a of the foam sheet 31, and the air layer 31c is formed below the nonwoven fabric insertion layer 31b. The through hole 31a is formed via the air layer 31c. The impact sound in the frequency region of about 125 to 250 Hz, which is incident on the foam sheet from the wall surface, is more smoothly absorbed by the foam sheet 31 to achieve both weight reduction and soundproof performance of the floor structure A.

  The floor structure A of the present invention uses a foam sheet 31 as a part thereof. The foam sheet 31 is formed with a through hole 31a in a part thereof, and other parts than the through hole 31a are integrated.

  The foam sheet 31 receives the weight of the pedestrian over the entire surface of the foam sheet 31. Therefore, the foamed sheet 31 stably receives a pedestrian on the flooring 2 without excessively sinking the flooring 2 while absorbing an impact during walking. Therefore, the floor structure A of the present invention is excellent in walking feeling by preventing excessive sinking of the flooring 2 during walking.

  In the floor structure A, the case where the nonwoven fabric insertion layer 31b is formed only in the upper part of the through hole 31a of the foam sheet 31 has been described. However, in the case where the weight of the floor structure A may be slightly increased, FIG. As shown, the nonwoven fabric may be entirely inserted and filled into the through-hole 31a of the foam sheet 31, and the entire inside of the through-hole 31a may be used as the nonwoven fabric insertion layer 31b ′. The fibers constituting the nonwoven fabric insertion layer 31b ′ are in a state in which the foam sheet 31 is stably disposed on the base 1 so as not to enter between the facing surfaces of the foam sheet 31 and the base 1. It is preferable.

  In the floor structure A, the case where the nonwoven fabric insertion layer 31b is formed only in the upper part of the through hole 31a of the foam sheet 31 has been described. However, when the soundproof performance of the floor structure A is sufficient, FIG. As shown, the floor structure A may be reduced in weight by forming the entire inside of the through hole 31a as an air layer 31c ′ without forming the nonwoven fabric insertion layer 31b in the through hole 31a of the foamed sheet 31.

 Furthermore, in the floor structure A described above, the case where the nonwoven fabric 32 is interposed only between the opposing surfaces of the flooring 2 and the upper surface of the foamed sheet 31 has been described. As shown in FIG. In addition, the nonwoven fabric 33 is laminated, and the nonwoven fabric 33 is also disposed between the lower surface of the foam sheet 31 and the facing surface of the base 1, and the nonwoven fabrics 32 and 33 are laminated on the upper and lower surfaces of the foam sheet 31. 3, the soundproof performance of the floor structure A may be improved. Since the nonwoven fabric 33 is the same as the nonwoven fabric 32 described above, the description thereof is omitted.

  In the floor structure A, the case where the non-woven fabric 32 is disposed between the opposed surfaces of the flooring 2 and the upper surface of the foamed sheet 31 has been described. A non-woven fabric may be disposed between the surfaces facing the sheet 31, and the soundproof floor base material may be constituted by the foamed sheet 31 and the non-woven fabric laminated on the lower surface of the foamed sheet 31. In this case, a non-woven fabric insertion layer may be formed by inserting a non-woven fabric into the lower portion of the through-hole 31a of the foam sheet 31 or entirely, or the non-woven fabric is not inserted into the through-hole 31a of the foam sheet 31. The entirety of the hole 31a may be an air layer.

  Finally, in the above-described floor structure A, the case where the soundproof floor base material 3 is composed of the foam sheet 31 and the nonwoven fabric 32 (33) laminated on one or both of the upper and lower surfaces of the foam sheet 31 has been described. However, a sheet such as a moisture-proof sheet, an adhesive penetration prevention sheet, or a urethane sheet may be interposed between the foam sheet 31 and the nonwoven fabric 32 (33).

Example 1
A cross-linked polypropylene closed cell foam sheet having a length of 500 mm × width of 1000 mm × thickness of 3 mm and a foaming ratio of 20 times was prepared, and a plurality of through holes penetrating between the upper and lower surfaces of the closed foam sheet were formed. The through hole had a planar perfect circle shape with an opening end shape having a diameter of 20 mm. The through holes are formed at regular intervals in the vertical and horizontal directions so that the centers of the open ends of the through holes coincide with the virtual grids drawn on the upper surface of the closed cell foam sheet, and the through holes adjacent to each other. The distance between the centers of the open ends was 70 mm.

  And the said closed cell foam sheet was arrange | positioned on the concrete slab with a thickness of 15 cm, and the nonwoven fabric with a thickness of 0.6 mm was laminated | stacked on the upper surface of this closed cell foam sheet. Thereafter, a wooden flooring material having a thickness of 9 mm was disposed on the nonwoven fabric to prepare a floor structure.

(Example 2)
A floor structure was produced in the same manner as in Example 1 except that the opening end shape of the through hole was a planar perfect circle shape having a diameter of 25 mm and the distance between the centers of the opening ends of the adjacent through holes was 65 mm.

(Example 3)
A floor structure was produced in the same manner as in Example 1 except that the opening end shape of the through hole was a planar perfect circle shape with a diameter of 30 mm and the distance between the centers of the opening ends of the adjacent through holes was 60 mm.

Example 4
A floor structure was produced in the same manner as in Example 1 except that the opening end shape of the through hole was a flat circular shape with a diameter of 50 mm and the distance between the centers of the opening ends of the adjacent through holes was 65 mm.

(Comparative Example 1)
A floor structure was prepared in the same manner as in Example 3 except that the nonwoven fabric was not disposed on the upper surface of the foamed sheet.

(Comparative Example 2)
A floor structure was prepared in the same manner as in Example 4 except that the nonwoven fabric was not disposed on the upper surface of the foamed sheet.

(Comparative Example 3)
A floor structure was prepared in the same manner as in Example 4 except that the thickness of the foamed sheet was 5 mm and the nonwoven fabric was not disposed on the top surface of the foamed sheet.

  The soundproof floor impact level was measured in accordance with JIS A1418 as the soundproof performance of the obtained floor structure, and the results are shown in Table 1. The unit of the numbers in the table is “dB”.

It is the model longitudinal cross-sectional view which showed the floor structure of this invention. It is a partial notch model perspective view which showed the floor structure of this invention. It is the model top view which showed the opening end of the through-hole formed in the foam sheet. It is the model top view which showed another example of the opening end of the through-hole formed in the foam sheet. It is the model longitudinal cross-sectional view which showed another example of the floor structure of this invention. It is the model longitudinal cross-sectional view which showed another example of the floor structure of this invention. It is the model longitudinal cross-sectional view which showed another example of the floor structure of this invention.

Explanation of symbols

1 foundation 2 flooring 3 soundproof flooring
31 Foam sheet
31a Through hole
31b Nonwoven fabric insertion layer
31c Air layer
32 Nonwoven fabric
33 Nonwoven fabric A Floor structure

Claims (4)

A floor structure in which a soundproof floor base material is disposed between a base and a flooring material, wherein the soundproof floor base material includes a foam sheet in which a through-hole penetrating between upper and lower surfaces is formed, and the foam sheet. A floor structure comprising a nonwoven fabric laminated on at least one of upper and lower surfaces. The floor structure according to claim 1, wherein a nonwoven fabric is inserted into the through-hole of the foam sheet. The nonwoven fabric is inserted so that a part of through-hole is filled in the through-hole of a foam sheet, The nonwoven fabric insertion layer and the air layer are formed in the through-hole. Floor structure. The floor structure according to claim 1, wherein nonwoven fabrics are laminated on the upper and lower surfaces of the foam sheet.

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