JP2011163042A - Sound insulating fire-resistant structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sound insulating fire-resistant structure having a fire resisting property and a sound insulating property in a simple structure, and capable of easily accommodating changes in design. <P>SOLUTION: In the sound insulating fire-resistant structure 1 in which a sound insulating wall 10 is arranged in a framework comprising a steel member 3 provided with a fire-resistive cover 2, a sound insulating member 15 which is in tight contact with the surface of the fire-resistive cover 2 is arranged on the end of the sound insulating wall 10 abutting on the fire-resistive cover 2. Further, the sound insulating member 15 is formed projecting outward in the direction of the wall thickness from the end of the sound insulating wall 10. Moreover, the sound insulating member 15 is preferably made of a sound insulating plate material. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a sound insulation and fireproof structure.

  In many cases, a semi-dry rock wool spraying method is employed for fireproof coating applied to steel members such as steel beams and steel columns. Rock wool is a man-made mineral fiber that is melted at high temperatures and made into a fibrous form using blast furnace slag, basalt, and other natural rocks with excellent heat resistance as the main raw material. Glass wool, on the other hand, is an artificial mineral fiber made of glass as a main raw material and melted at a high temperature to form a fiber. Both rock wool and glass wool are excellent in heat resistance, heat insulation and sound absorption. The bulk specific gravity of glass wool produced as a sound absorbing material is about 0.008 to 0.096, and the bulk specific gravity of rock wool is about 0.04 to 0.30. In both cases, the thicker the specific gravity, the better the sound absorption effect in the mid-low range. On the other hand, the bulk specific gravity of spray rock wool as a fireproof coating is 0.30 or more. For example, in the case of 2 hours fireproof, a thickness of 45 mm or more is required. This is a specification that can be expected to have a certain level of performance when considered as a sound absorbing material. However, compared with solid materials such as iron plates, the specific gravity of rock wool is small, so its performance as a sound insulating material is low. Therefore, in the case where the partition wall is installed under the steel beam, there is a problem that the sound insulation performance cannot be sufficiently obtained between the wall and the steel beam.

  When a fireproof coating is required at a site where sound insulation performance is required, as shown in FIG. 5, after installing a sound insulation plate 101 on the lower surface of the steel beam 100 and applying the fireproof coating 102 to cover this, A construction method in which the partition wall 103 is attached to the lower part, or a construction method in which the entire portion having a low sound insulation performance (joint portion between the steel beam 101 and the partition wall 103) is enclosed with a sound insulation board 105 or the like (see FIG. 6) For example, Patent Document 1) has been adopted.

JP 2008-240355 A

  In the construction method of FIG. 5, when the position of the partition wall is changed after the fireproof coating is applied, the sound insulation plate 101 must be replaced with the steel frame assembled. Since the sound insulation plate 101 is attached to the lower surface of the steel beam 100, the workability is poor and the quality may be deteriorated. Further, in the construction method of FIG. 6, since the partition wall that covers the steel beam 101 and the upper end portion of the partition wall 103 is formed by the board 105, the structure is complicated and the construction becomes large, requiring much labor and time. There was a problem that caused an increase in construction costs.

  From such a viewpoint, it is an object of the present invention to provide a sound insulation and fireproof structure that can obtain fireproof performance and sound insulation performance with a simple configuration and can easily cope with design changes.

  The present invention devised to solve such problems is the sound insulation wall in contact with the fireproof coating in a sound insulation fireproof structure in which a sound insulation wall is provided in a shaft composed of a steel frame member provided with a fireproof coating. The sound insulation and fireproof structure is characterized in that a sound insulation material that is in close contact with the surface of the fireproof coating is provided at the end of the above.

  The transmission loss of sound in the fireproof coating increases as the transmission distance increases. When the surface of the fireproof coating is covered with the sound insulating material as described above, the distance through which sound passes through the fireproof coating becomes long. Therefore, sound is absorbed in the fireproof coating sandwiched between the sound insulating material and the steel frame member, and the sound insulating performance is improved. Further, the present invention has a simple configuration as compared with the prior art. Furthermore, since the sound insulating material is provided outside the fireproof coating, it is possible to easily cope with a design change even after the construction of the fireproof coating.

  Further, the present invention is characterized in that the sound insulating material is formed so as to protrude from an end portion of the sound insulating wall in the wall thickness direction. According to such a configuration, since no gap is generated between the sound insulation wall and the sound insulation material, the sound insulation performance can be further enhanced. Moreover, since the sound insulating material is formed at the same time as or after the construction of the sound insulating wall, it is easy to perform the construction.

  Furthermore, the present invention is characterized in that the sound insulating material is composed of a sound insulating plate material. According to such a structure, a sound insulating material can be formed by easy construction.

  Further, the present invention is characterized in that the sound insulating material is constituted by a wet fireproof coating. According to such a configuration, it is possible to form a sound insulating material having both sound insulating properties and fire resistance by easy construction such as plastering or spraying.

  According to the present invention, fireproof performance and sound insulation performance can be obtained with a simple configuration, and an excellent effect of being able to easily cope with a design change is exhibited.

It is sectional drawing which showed the sound insulation fireproof structure which concerns on embodiment of this invention. (A) is sectional drawing which showed the propagation state of the sound in the sound insulation fireproof structure which concerns on embodiment of this invention, (b) is sectional drawing which showed the propagation state of the sound in the comparative example without a sound insulation material. It is the graph which showed the relationship between sound transmission distance and sound transmission loss. It is the graph which compared the sound transmission loss of the sound insulation fireproof structure which concerns on embodiment of this invention, and the sound transmission loss of the fireproof structure which does not provide the sound insulation material. It is sectional drawing which showed the conventional sound insulation fireproof structure. It is sectional drawing which showed the other conventional sound insulation fireproof structure.

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings. In the present embodiment, a case where a sound insulating wall is provided in the lower part of the steel beam will be described as an example.

  As shown in FIG. 1, a sound insulation and fireproof structure 1 according to an embodiment of the present invention includes a sound insulation wall 10 in a shaft assembly composed of a steel member 3 (only a steel beam is shown in FIG. 1) provided with a fireproof coating 2. Is provided. And the sound insulation material 15 closely_contact | adhered to the surface of the fireproof coating 2 is provided in the edge part of the sound insulation wall 10 contact | abutted to the surface of the fireproof coating 2. It is characterized by the above-mentioned.

  As the fireproof coating 2, for example, semi-dry spray rock wool is adopted. The semi-dry spraying rockul is formed by mixing rock wool and cement slurry at a predetermined ratio. Rock wool having a bulk specific gravity of 0.30 or more is used. The fire-resistant clothing 2 has a certain thickness (for example, 45 mm or more in the case of 2-hour fire resistance) on the surface of the steel member 3 through a spray nozzle (not shown) so that the steel member 3 is not exposed. Be sprayed.

  The steel member 3 in the present invention is a member constituting a structural material of a building such as a steel beam or a steel column. 1 shows the sound insulation and fireproof structure 1 in the upper part of the sound insulation wall 10, and only the steel beam is shown. However, the sound insulation and fireproof structure in the side part of the sound insulation wall has substantially the same structure as the sectional structure in FIG. In addition, a sound insulating material is provided along a fireproof coating applied to a steel column (not shown).

  The sound insulation wall 10 is formed by sticking a board material 13 having a predetermined thickness on both sides, with a stud 12 standing between runners 11 (only shown on the upper side) provided extending in the horizontal direction at the top and bottom of the wall. It is configured. Glass wool (not shown) is accommodated between the studs 12 adjacent to each other at a predetermined interval on the inner side surrounded by the board materials 13 and 13 on both wall surfaces. The sound insulation wall 10 is in close contact with the surface of the fireproof coating 2 whose upper end is sprayed on the steel beam. Although not shown, the side end of the sound insulation wall facing the steel column is in close contact with the surface of the fireproof coating sprayed on the steel column.

  The sound insulating material 15 is formed to project outward from the end of the sound insulating wall 10 facing the steel beam or the steel column in the wall thickness direction. The outer side in the wall thickness direction is a direction away from the wall surface and indicates a direction orthogonal to the wall surface. The sound insulating material 15 in the present embodiment is made of a sound insulating plate material (for example, a sound insulating steel material such as a lead plate). The sound insulating material 15 is arranged substantially in parallel with the flange portion 4 of the steel beam, and extends from the upper ends of both surfaces of the sound insulating wall 10 to both outer sides in the wall thickness direction. The base end portion of the sound insulating material 15 is provided in close contact with the upper end portion of the sound insulating wall 10 without a gap. The front end portion of the sound insulating material 15 on the outer side in the wall thickness direction extends to a portion corresponding to the outer end in the width direction of the flange portion 4 of the steel beam. In addition, the front-end | tip position of the sound insulation material 15 is not limited to the vicinity of the outer end of the flange part 4, It is good also as a position near a wall according to required sound insulation performance. Further, the thickness of the sound insulating material 15 may be changed according to the required sound insulating performance.

  Between the sound insulating material 15 and the flange portion 4 of the steel beam, a sound absorbing path 20 connected to each room partitioned by the sound insulating wall 10 is formed. The sound absorption path 20 is constituted by the fireproof coating 2 and has a sound absorption effect by the fireproof coating 2. The sound absorption path 20 has one end in the width direction opened to one room, and the other end in the width direction opened to the other room. The sound absorption path 20 is formed with a constant width along the end surface of the sound insulating wall 10. The width of the sound absorption path 20 (the distance between one end and the other end) is the shortest distance connecting the rooms, and is the sound transmission distance L1. By providing the sound insulating material 15, the width of the sound absorption path 20 is increased, and the sound transmission distance L1 is increased. In the case where the sound insulating material 15 is not provided, the transmission distance is only the wall thickness L0 of the sound insulating wall 10, but in this embodiment, the transmission distance is a length obtained by adding the wall thickness of the sound insulating wall 10 and the width of the sound insulating material 15 on both sides. .

Here, the relationship between the sound transmission distance and the sound insulation performance in the sound absorbing material will be described with reference to the graph of FIG. The sound absorbing material used in this graph is glass wool 96 kg / m ³ . In this graph, the sound transmission loss when the transmission distance is 150 mm, 225 mm, and 300 mm is shown for sounds of 250 Hz, 500 Hz, 1 KHz, and 2 KHz. As shown in FIG. 3, it can be seen that the sound transmission loss increases in proportion to each frequency as the transmission distance increases. The value of the transmission distance of 150 mm is assumed from the thickness of a general sound insulation wall, and assumes the state of FIG. 2B without a sound insulation material. Although glass wool was used as a sound-absorbing material for the convenience of the experiment, in the spray rock rock wool, the bulk specific gravity is larger than that of glass wool, so the sound transmission loss increases as a whole, but as a trend, it shows similar properties Seem.

  Therefore, by increasing the sound transmission distance L1 as in this embodiment, the sound absorbing effect inside the fireproof coating 2 having the performance as a sound absorbing material is increased, and as a result, the sound insulation performance can be improved. Specifically, as shown in FIG. 2A, sound generated in one room enters the fireproof coating 2 from the end of the sound insulating material 15 and absorbs sound while passing through the fireproof coating 2. Is done. The sound that reaches the vicinity of the upper end of the sound insulation wall 10 is sound-insulated by the sound insulation material 15 and does not enter the fireproof coating 2. Also, the sound that is about to be emitted from the fireproof coating 2 to the other room near the upper end of the sound insulation wall 10 is sound-insulated by the sound insulation material 15 and therefore does not leak into the room. Here, FIG. 2B illustrates a comparative example in which a sound insulating material is not provided. When there is no sound insulating material, the sound generated in one room enters the fireproof coating 2 from the vicinity of the upper end of the sound insulating wall 10, passes through the fireproof coating 2 by the wall thickness, and exits to the other room. At this time, since the transmission distance is short, the sound is not sufficiently absorbed, and the sound leaks to the other room. From this, it can be seen that the effect of providing the sound insulating material 15 is great.

  The graph of FIG. 4 compares the sound transmission loss of the sound insulation fireproof structure 1 according to the present embodiment with the sound transmission loss of a fireproof structure without a sound insulation material. The sound insulation wall used in the experiment has a wall thickness of about 150 mm, which is about the same as the sound insulation wall in FIG. Loss is rising. As shown in FIG. 4, except for the vicinity of 100 Hz, it can be seen that the sound insulation and fireproof structure 1 according to the present embodiment has a larger sound transmission loss than the fireproof structure without the sound insulation material. In particular, in the peripheral region of 150 Hz to 1000 Hz, the difference in sound transmission loss is as large as 10 dB or more, and it can be seen that the sound insulation performance is greatly improved.

  Since the sound insulating material 15 is installed after the construction of the fireproof coating 2, it can easily cope with a design change. That is, even if the position of the sound insulation wall 10 is changed after applying the fireproof coating 2, the fireproof coating 2 may be left as it is, and it is not necessary to replace the sound insulation plate as in the prior art shown in FIG. The sound insulation wall 10 is constructed at the changed position, and the sound insulation material 15 may be provided thereafter. Moreover, compared with the prior art shown in FIG. 6, a structure is very simple, construction labor and time can be shortened, and construction cost can be reduced. Furthermore, since there is no complicated shape construction, construction accuracy can be improved.

  Furthermore, since the sound insulation material 15 can be provided even after the construction of the sound insulation wall 10, even if the sound insulation performance is added to a room that originally did not require the sound insulation performance, it is only necessary to retrofit the sound insulation material 15 and perform a large-scale construction. There is no need to do it. Therefore, the necessary sound insulation performance can be obtained with simple construction.

  As mentioned above, although the form for implementing this invention was demonstrated, this invention is not the meaning limited to the said embodiment, A design change is possible suitably in the range which does not deviate from the meaning of this invention. For example, in this embodiment, the sound insulating material 15 is made of a sound insulating steel material such as a lead plate, but is not limited thereto. The sound insulating material may be constituted by a sound insulating plate material other than steel, or may be constituted by applying or spraying a sound insulating wet material so as to have a predetermined thickness. When the sound insulation wet material is used, the width and thickness of the sound insulation material can be easily changed according to the required sound insulation performance, and the adhesion to the fireproof coating 2 and the sound insulation wall 10 can be enhanced. Moreover, even when a plate material is used as the sound insulating material, the sound insulating performance can be easily changed by simply changing the size of the plate material. Further, the sound insulating material may be composed of a wet fireproof coating. As the wet fireproof coating, for example, if a ceramic wet fireproof coating having a large specific gravity is employed, high sound insulation performance can be obtained. According to this, it is possible to form a sound insulation material having both sound insulation and fire resistance by easy construction such as plastering or spraying.

  In the present embodiment, the sound insulating material 15 extends from the upper end of the sound insulating wall 10 to both sides in the wall thickness direction, but may be configured to protrude only to one side.

DESCRIPTION OF SYMBOLS 1 Sound insulation fireproof structure 2 Fireproof coating 3 Steel member 10 Sound insulation wall 15 Sound insulation material

Claims (4)

In the sound insulation and fireproof structure in which the sound insulation wall is provided in the frame composed of the steel member with fireproof coating,
A sound insulation and fireproof structure, characterized in that a sound insulation material in close contact with the surface of the fireproof coating is provided at an end portion of the sound insulation wall in contact with the fireproof coating. The sound insulation and fireproof structure according to claim 1, wherein the sound insulation material is formed so as to project outward from the end of the sound insulation wall in the wall thickness direction. The sound insulation and fireproof structure according to claim 1 or 2, wherein the sound insulation material comprises a sound insulation plate. The sound insulation material according to claim 1 or 2, wherein the sound insulation material is formed of a wet fireproof coating.

Images