JPS59187967A - Sound blocking double sound structure - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a sound-insulating double floor structure that supports flooring while maintaining an appropriate space above the floor slab.

[Prior art]

In the conventional double floor structure, as shown in FIG.
The floor joists 12 are arranged perpendicularly and parallel to each other on the top, that is, the large joists 11 and the joists 12 are assembled in a lattice shape to constitute a floor base. (not shown), and as shown in FIG. 2, there are known structures in which a subfloor base body (not shown in FIG. 1) is supported by support bolts 13. Furthermore, in recent years, as shown in FIG. 3, support legs 1 with adjustable horizontal levels have been installed on a panel board 14 of a predetermined size as a double floor structure for apartment complexes, gymnasiums, etc.
Prepare a large number of unit panels 16 to which 5 is attached, place these unit panels 16 on the floor slab 10, and apply strip material 1 to the juxtaposed unit panels 16 as shown in FIG.
7 is applied, and a finishing material 18 is further applied. In the double floor structure constructed using this floor construction method,
The panel board 14, the lining material 17 and the finishing material 18 are the flooring material 2
0, and the flooring 20 is supported (by the supporting legs 15) with an appropriate space above the floor slab 10.

The conventional floor structures shown in FIGS. 1 to 4 all have a double floor structure to prevent floor impact noise from being transmitted downstairs.

Among these conventional floor structures, the structure shown in FIG. 4 has the best floor impact sound insulation performance. Cushion rubber 10 is attached to support leg 15 in this structure, plywood with a thickness of 12 mm is used as upholstery material 17, and finishing material 18
The height from the floor slab 10 to the top surface of the finishing material 18 is 120 m.
m, and was constructed on a floor slab 10 with a thickness of 120 mm, and the results were measured in accordance with JJS A-1418, "Method for measuring floor impact sound levels at building sites," as follows: It was as shown in Table 1.

In addition, the correspondence between the sound insulation grade of floor impact noise and the actual living experience is shown in Table 2 below.

In addition, for the double floor structure of the wooden large joist type (see Figure 1), the measurement data using a weight impact source is L-65 in terms of sound insulation class.
It was about ~71. Compared to this large joist type, the one using the unit panel 16 shows a significant improvement.

Even in a double floor structure using unit panels that improves floor impact sound isolation performance, there are usually four support legs (15).
There are large differences in rigidity at the center of the panel board 14 whose four corners are supported, at the butt joint between adjacent panel boards 14, and directly above the support legs 15, and the overall rigidity of the flooring material 20 is Unevenness is inevitable, and this is why the "child's jump"
The relative balance against weight impacts, such as those caused by overturning of objects or overturning of equipment, is poor, and when an impact is applied to a location with low floor rigidity, bending vibration spreads throughout the floor, causing a deterioration in floor impact sound isolation performance. It had become. In this double floor structure, the unit panels 16 adjacent to the unit panel 16 that received the weight impact "spring up", which appears to be a relative movement in reaction to the impact, leading to a decrease in the shielding performance in the low frequency range of 125 Hz or less. was. Furthermore, such a floor structure also causes so-called transmitted sound, which is caused by the bending vibration caused by the weight impact, which connects to the upper pipe at the sound pressure level in the space below the unit panel 16, and propagates directly to the downstairs.

[Purpose of the invention]

This invention was invented in view of the above circumstances,
The object of the present invention is to provide a sound insulating double floor structure that improves the sound insulation function of the double floor structure, and particularly improves the sound insulation ability in the low frequency range.

[Structure of the invention]

In order to achieve the above object, the present invention constitutes a dynamic vibration absorbing material by an elastic damping material made of polyurethane foam or the like and a restraining additional mass made of a steel plate or the like attached to one side of the elastic damping material. The elastic damping material, which is a dynamic vibration absorber, is fixed to the flooring material, and the restraint additional mass is not connected to the flooring material and is configured freely.

[Embodiments of the invention]

Some preferred embodiments of the present invention will be described below with reference to FIG. 5 and the following drawings.

In the first embodiment shown in FIG. 5, the present invention is applied to a floor structure using the unit panel 16 shown in FIGS. 3 and 4. In FIG. 5, the brackets 21 are attached to the four corners of the panel board 14, the ports 22 of the support legs 15 are attached to these brackets 21, the lower part of the bolt 22 is attached to the brackets 23 of the cushion rubber 19, and the ports 22 of the support legs 15 are attached to the brackets 23 of the cushion rubber 19. is placed on the floor slab 10, and an appropriate space is formed between the floor slab 10 and the flooring 20 by support legs 15. Flooring material 20
Panel board 14, sacrificial material 17, and finishing material 18 that constitute the
Of these, the bottom surface of the panel material 14 is made of polyurethane foam, polyethylene foam, PVC foam, etc.
An elastic damping material 31 made of a material having a thickness of 0 mm, a density of 0.1 g/cm3 or less, and a low spring constant is fixed, and a 1.0 to 4.5 mm thick A restraining additional mass made of a thick steel plate with a density of 1.5 g/cm3 or more, a lead sheet or a sheet made of vinyl chloride with an inorganic filler added, or a slate plate with a thickness of 5 to 20 mm. 32 was fixed. The dynamic vibration damping material 30 is constituted by the elastic vibration damping material 31 and the constrained load mass 32. In order to attach this dynamic vibration absorbing material 30 to the flooring material 20, it is important that it functions as a dynamic damper, and therefore the restrained additional mass 32 needs to be free and not connected to the flooring material 20. .

In the second embodiment shown in FIG.
The mounting location was changed. That is, the elastic damping material 31 of the dynamic vibration absorbing material 30 is attached to the flooring material 20 (panel board 14) using the mounting bracket 24, and the restraining additional mass 32 is affixed to the 31 strips of the elastic damping material, so that the dynamic vibration damping material 30 It has a structure in which it is suspended below the flooring material 20 by a mounting bracket 24. In FIG. 7, the portion hatched diagonally with chain lines from the lower left to the lower right is the constraint additional mass 32, and the cross-hatched portion is the elastic vibration absorbing material 31.

Figures 8 and 9 show a third embodiment in which a dynamic vibration absorbing material 30 is attached to a double floor structure of the large joist type, in which the large joist material 11 and the joist material 12 are crossed at the same level. This intersecting part is supported by a cross metal fitting 25, the support leg 15 is attached to this cross metal fitting 25, and the flooring material 20 is mounted on the upper surface of the large tension material 11 and the joist material 12 assembled in a lattice shape. Dynamic vibration absorbing material 30 was attached to the lower surface of 20 and located in the lattice space between the large tension material 11 and the joist material 12. The installation of the dynamic vibration absorbing material 30 involves fixing the elastic damping material 31 to the lower surface of the floor material 20 in the same way as in the embodiment shown in FIG.
2 is attached, but it may also be hung with a mounting bracket 24 as in the embodiment shown in FIG.

Further, the dynamic vibration absorbing material 30 can also be attached to a large joist type floor structure as shown in FIG.

The fourth embodiment shown in FIG. 10 shows an example in which a dynamic vibration absorbing material 30 is attached to the upper surface of the panel plate 14 of the unit panel 16.

When installing the dynamic vibration absorbing material 30 on the top surface of the panel board 14, if a load from the floor is directly applied to the dynamic vibration absorbing material 30, it will lose its function as a dynamic damper. It must be kept free from the material 20. Therefore, a space material 26 is interposed between the panel board 14 and the board material 27 to provide a gap larger than the thickness of the dynamic vibration absorbing material 30, and the restraint additional mass 3
2 is configured so that it is not regulated.

In the fifth embodiment shown in FIG.
A dynamic vibration absorbing material 30 is built into the panel board 14, and the unit panel 16 itself has a new structure. Therefore, at the construction site, two panel boards 14, 14, space material 2
6. The unit panels 16 provided with the dynamic vibration absorbing material 30 and the support legs 15 are sequentially arranged side by side on the floor slab 10, and construction can be carried out in the same manner as the conventional floor construction method.

In the sixth embodiment shown in FIG.
7 and 27, a space material 26, and a dynamic vibration absorbing material 30, and the dynamic vibration absorbing material 30 is built into the shingle material 17.

In each of the embodiments described above, the elastic damping material 31 has a density of about 0.045 g/cm3 and a spring constant of 4 x 105 N/m/m2 to 11
A material that can be changed to ×105 N/m/m2 is desirable. In addition, by compressing a material with a density of 0.02 g/cm3 and a thickness of 10 mm that exhibits a spring constant of 10 x 105 N/m/m2 by 50%, the spring constant is multiplied by 4 to 105
It may be used at a lower value of N/m/m2. Also,
The combination conditions of the elastic vibration damping material 31 and the restraint additional mass 32 are as follows:
It can be designed according to the frequency to be addressed, and its basic formula is determined by the vibration system % formula of degrees of freedom. In this formula, M represents the mass of the constraint additional mass 32, and K represents the spring constant.

Next, several embodiments of the present invention including the dynamic vibration absorbing material 30 and a conventional double floor structure were compared in terms of floor impact sound isolation performance according to JIS A-1418. First, the floor impact sound insulation performance of each double floor structure shown in FIGS. 13(a) to 13(d) was compared. This was measured using a weight impact source (tire drop). Figure 13(a)
The unit panel 16 has a panel plate 14 with a size of 910 mm x 910 mm and a thickness of 20 mm, and a thickness of 9 mm.
The plywood material 17 was constructed as shown in the same figure (b).
) uses the unit panel 16 and the shingle material 17 under the same conditions as in (a), and is equipped with the dynamic vibration absorbing material 30 of the embodiment shown in FIG. In addition, FIG. 13(c) shows 60
A unit panel 16 having a panel board 14 with a size of 0 mm x 600 mm and a thickness of 20 mm is used, the interval L between the unit panels 16 is 310 mm, and the thickness is 20 mm.
The plywood material 17 was constructed as shown in the same figure (d).
) is the floor structure of (c) with a dynamic vibration absorbing material 30 attached, and the dynamic vibration absorbing material 30 is attached not only to the panel board 14 but also to the back surface of the lining material 17 at the interval L. The insulation performance against floor impact sound (weight impact source) for each of the floor structures shown in FIGS. 13(a) to (d) is as follows:
It was as shown in FIG.

In Figure 13, (a) is L-58, (b) is L-53, (
c) had a sound insulation grade of L-53, and (d) had a sound insulation grade of L-47.

Next, we will discuss a unit panel 16 with a built-in dynamic vibration absorbing material 30 (see FIG. 15(c)) and a conventional unit panel 1.
6 and the pile material 17 (see Figure 15 (b)), and a double structure using the conventional floor construction method (see Figure 5 (a)). The floor impact sound insulation performance of the two was compared. The results are as shown in FIG. 16, and the one shown in FIG. 15(c), which is an example of the present invention, was L-58, and the one shown in FIG. 15(a) was L-58. The comparison data shown in FIG. 16 is also data measured by a weight impact source (tie or drop), similar to FIG. 14.

(Effects of the Invention) As explained above, according to the present invention, in the sound-insulating double floor structure that supports the flooring while maintaining an appropriate space on the floor slab, the dynamic vibration absorbing material is attached to the flooring. The elastic vibration damping material of this dynamic vibration damping material acts as a spring material, and the dynamic vibration damping material functions as a dynamic damper due to the constrained additional mass attached to this elastic damping material and configured freely without being connected to the flooring material. ,
As a result, as shown in the graphs of FIGS. 14 and 16, the sound insulation properties in the low frequency range were significantly improved. Further, according to the present invention, since the dynamic vibration absorbing material is composed of an elastic damping material made of polyurethane foam or the like and a restraining additional mass made of a steel plate or the like affixed to one side of the elastic damping material, It is easy to apply to flooring materials, and has the advantage that it can be simply added to the top surface of flooring materials when repairing downstairs to address noise problems.

Of course, it can be easily performed during new construction, or by incorporating dynamic vibration absorbing materials into the unit panels and lining materials, the on-site construction effort can be made the same as with the conventional floor construction method.

[Brief explanation of drawings]

1 to 3 are a perspective view and a front view of a conventional double floor structure, FIG. 4 is a partially sectional perspective view of a conventional unit panel, and FIG. 5 is a first embodiment of the present invention. 6 is a front view showing a second embodiment of the invention, FIG. 7 is a plan view of the unit panel in FIG. 6, and FIG. 8 is a front view showing a third embodiment of the invention. , FIG. 9 is a perspective view showing the support means for the pulling material and the joist material in FIG. 8, and FIG.
11 is a front view showing a fifth embodiment of the invention, FIG. 12 is a front view showing a sixth embodiment of the invention, and FIG. 13 is a sectional view showing a fourth embodiment of the invention. a) or (d)
) is a front view showing the experimental sample, (b) and (d
) is an example of the present invention, FIG. 14 is a graph showing floor impact sound insulation performance measured using the experimental sample shown in FIG. 13,
15(a) to 15(c) are front views showing experimental samples, FIG. 15(c) is an example of the present invention, and FIG.
It is a graph obtained by measuring floor impact sound insulation performance using the experimental sample shown in the figure. 10...Floor slabs, 20...Raw materials (panel boards, lining materials, finishing materials,
Plate material), 30...Dynamic vibration absorbing material, 31...Elastic vibration damping material, 32...Restriction additional mass, Applicant: Bridgestone Tire Co., Ltd. Agent, Patent attorney: Takeo Masuda

Claims (1)

[Scope of Claims] 1. In a sound-insulating double floor structure in which flooring is supported at appropriate intervals on a floor slab, (a) of the dynamic vibration absorbing material consisting of the following (a) and (b) is applied to the floor. (b) A sound-insulating double floor structure characterized by being fixed to the flooring material and freely constructed without being connected to the flooring material. (a) An elastic damping material made of polyurethane foam, etc.; (b) This elastic damping material. A restraining additional mass consisting of a steel plate, etc. affixed to one side of the vibration material.