Floating bed structure

Abstract

To provide a floating floor structure improved in vibration-proof performance, while sufficiently securing load bearing performance, and reducing a construction cost of the floating floor structure.SOLUTION: A buffer (14) is formed of polyolefin resin foam, and load bearing materials (20) are arranged in housing holes (18h) of a buffer body (18). Each load bearing material (20) has an elastic body (22) and a thickness adjusting material (24) arranged to vertically overlap with the elastic body (22). A dynamic spring constant of the buffer body (18) is 10×106 N / m3 or less, and the dynamic spring constant of the elastic body (22) is 7×106 N / m3 or less.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a floating floor structure including a buffer disposed on a floor slab and a floating floor portion disposed on the buffer.

Background Art

[0002] Conventionally, as a noise countermeasure in concrete medium- and high-rise apartment houses, a floating floor structure has been adopted in which a buffer is disposed on a floor slab such as a concrete slab, and a concrete floating floor portion is disposed on the buffer. The floating floor structure described in Patent Document 1 uses an inorganic fiber board such as glass wool or rock wool as a buffer disposed between the floor slab and the concrete floating floor portion.

[0003] However, since inorganic fiber boards such as glass wool deteriorate the vibration isolation performance and sound insulation performance of the floating floor structure when they contain moisture, it is necessary to dispose a waterproof layer before placing concrete on site. Therefore, there has been a problem that the man-hours of the floating floor structure increase and the construction period of the floating floor structure becomes long.

[0004] Therefore, as in the floating floor structure described in Patent Document 2, the application of a synthetic resin foam as a material of the buffer body of the buffer has been proposed. Since the synthetic resin foam has little water content, the vibration isolation performance and sound insulation performance of the floating floor structure do not deteriorate even in a place where there is a high possibility of water content.

[0005] Furthermore, in the floating floor structure described in Patent Document 2, a plurality of accommodation holes are formed to penetrate in the thickness direction in the buffer body. In each accommodation hole of the buffer body, a water-resistant elastic body having less creep deformation than the buffer body (synthetic resin foam) is disposed. And each elastic body is configured to support the load of the floating floor portion as the buffer body is compressed and deformed by the load of the floating floor portion. Therefore, the settlement of the floating floor portion due to the compression deformation of the buffer body can be kept within an allowable range.

Prior Art Documents

Patent Documents

[0006] Patent Document 1 Japanese Patent Application Laid-Open No. 3-100262 Patent Document 2 Japanese Patent Application Laid-Open No. 2001-200629 SUMMARY OF THE INVENTION PROBLEMS TO BE SOLVED BY THE INVENTION

[0007] However, as an elastic body for improving the vibration isolation performance while sufficiently ensuring the load-bearing performance against the load on the floating floor portion, a relatively expensive material such as a urethane-based elastomer is used. Therefore, there has been a demand for the emergence of a floating floor structure that can reduce the construction cost by reducing the amount of use of the relatively expensive elastic body and can improve the vibration isolation performance while sufficiently ensuring the load-bearing performance.

[0008] Therefore, one aspect of the present invention aims to reduce the construction cost of the floating floor structure, sufficiently ensure the load-bearing performance of the floating floor structure, and improve the vibration isolation performance and sound insulation performance of the floating floor structure. MEANS FOR SOLVING THE PROBLEMS

[0009] As a result of repeated trial and error, the inventor of the present application has found that when a thickness adjusting material is arranged in the accommodation hole of a buffer body main body made of a polyolefin-based foam so as to overlap with the elastic body in the vertical direction, by appropriately setting the dynamic spring constants of the buffer body main body and the elastic body, it is possible to suppress the cost and improve the vibration isolation performance and sound insulation performance of the floating floor structure while sufficiently ensuring the load-bearing performance of the floating floor structure. Here, appropriately setting the dynamic spring constants of the buffer body main body and the elastic body means setting the dynamic spring constant of the buffer body main body to 10×10 6 N / m 3 or less and setting the dynamic spring constant of the elastic body to 7×10 6 N / m 3 or less (see the examples described later).

[0010] The floating floor structure according to one aspect of the present invention is a floating floor structure including a buffer body disposed on a floor slab and a floating floor portion disposed on the buffer body. The buffer body is made of a polyolefin resin foam, and includes a buffer body main body having accommodation holes formed to penetrate in the vertical direction, and a load support member disposed in the accommodation holes of the buffer body main body and configured to support the load of the floating floor portion as the buffer body main body is compressed and deformed due to the load of the floating floor portion. The load support member includes an elastic body, and a thickness adjustment member that is disposed so as to overlap the elastic body in the vertical direction and is configured to be more rigid than the buffer body main body and the elastic body, and adjusts the thickness of the load support member. The dynamic spring constant of the buffer body main body is 6 N / m 3 or less, and the dynamic spring constant of the elastic body is 6 N / m 3 or less.

[0011] In the floating floor structure, the dynamic spring constant of the elastic body may be 6 N / m 3 or more.

[0012] In the floating floor structure, the ratio of the volume of the elastic body to the volume of each load support member may be 20% to 60%.

[0013] In the floating floor structure, the dynamic spring constant of the buffer body main body may be 6 N / m 3 or more.

[0014] In the floating floor structure, the ratio of the total area of the upper surfaces of all the load support members to the area of the entire upper surface of the buffer body may be 1% to 3%.

[0015] In the floating floor structure, the elastic body is made of high-density polyurethane foam, and the density of the elastic body may be 3 ~800Kg / m 3 or less.

[0016] In the floating floor structure, the thickness adjusting material may be made of at least one material selected from the group consisting of concrete, metal, wood, and synthetic resin.

[0017] In the floating floor structure, the bulk density of the polyolefin resin foam, which is the material of the buffer body main body, is 12 Kg / m 3 ~20 Kg / m 3 and the closed cell ratio of the polyolefin resin foam may be 80% or more.

Advantages of the Invention

[0018] According to one aspect of the present invention, it is possible to reduce the construction cost of the floating floor structure, sufficiently ensure the load-bearing performance of the floating floor structure, and improve the vibration isolation performance and sound insulation performance of the floating floor structure.

Brief Description of the Drawings

[0019]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Modes for Carrying Out the Invention

[0020] Hereinafter, the present embodiment will be described with reference to FIGS. 1 to 5. FIG. 1 is a schematic cross-sectional view of the floating floor structure according to the present embodiment. FIGS. 2 to 5 are schematic cross-sectional views of the floating floor structure according to other aspects of the present embodiment. In the present specification, unless otherwise specified, "A to B" representing a numerical range means "A or more (including A and greater than A), B or less (including B and less than B)".

[0021] (Schematic of the floating floor structure 10) As shown in Fig. 1, the floating floor structure 10 according to this embodiment includes a buffer 14 disposed on a floor slab 12 such as a concrete slab, and a concrete floating floor portion 16 disposed on the buffer 14. The specific configuration of the floating floor structure 10 is as follows.

[0022] (Buffer body 18) As shown in Fig. 1, the buffer 14 has a buffer body 18 made of a polyolefin resin foam. A plurality of accommodation holes 18h having a rectangular shape in plan view penetrate the buffer body 18 along the vertical direction (thickness direction). The plurality of accommodation holes 18h of the buffer body 18 are evenly arranged without omission. The shape of each accommodation hole 18h of the buffer body 18 in plan view may be a shape other than a rectangle such as a circle. Further, a vibration insulating portion 18f is formed so as to rise on the outer edge of the buffer body 18. The buffer body 18 has a function as a formwork for placing concrete to construct the floating floor portion 16.

[0023] (Load support member 20, elastic body 22, thickness adjustment member 24) As shown in Fig. 1, the buffer 14 has load support members 20 filled and disposed in the respective accommodation holes 18h of the buffer body 18. Each load support member 20 supports the load applied to the floating floor portion 16 including the dead weight of the floating floor portion 16. Each load support member 20 is configured to support the load applied to the floating floor portion 16 as the buffer body 18 is compressed and deformed due to the load applied to the floating floor portion 16.

[0024] Each load support member 20 has a water-resistant elastic body 22 with less creep deformation than the buffer body 18 (polyolefin resin foam). The elastic body 22 is formed in a block shape or a plate shape, and the shape of the elastic body 22 in plan view is the same as the shape of the accommodation hole 18h of the buffer body 18 in plan view.

[0025] Each load support member 20 has a thickness adjustment member 24 for adjusting its thickness, and the thickness adjustment member 24 is arranged so as to vertically overlap the lower side of the elastic body 22. The thickness adjustment member 24 is formed in a block shape or a plate shape, and the planar shape of the thickness adjustment member 24 is the same as the planar shape of the accommodation hole 18h of the buffer body main body 18. The thickness adjustment member 24 is configured to be more rigid (higher rigidity) than the buffer body main body 18 and the elastic body 22.

[0026] The thickness of each load support member 20 is the same as the thickness of the buffer body main body 22 excluding the vibration isolation portion 18f. Note that the thickness of each load support member 20 may be greater than the thickness of the buffer body main body 22 excluding the vibration isolation portion 18f.

[0027] Also, as a more specific configuration, the buffer 14 is configured as an assembly of a plurality of panels (for example, a panel with an area of 1 m 2 of the buffer body main body 18). And one accommodation hole 18h is provided for each buffer body main body 18 of one panel. The accommodation hole 18h is provided at the center of the buffer body main body 18. And the load support member 20 is filled in this accommodation hole 18h. Note that the number of the accommodation holes 18h and the load support members 20 is not particularly limited. However, from the viewpoint of cost, it is preferable that the number of the accommodation holes 18h and the load support members 20 is small.

[0028] (Another aspect of the load support member 20) Instead of arranging the thickness adjusting member 24 so as to vertically overlap the lower side of the elastic body 22, as shown in FIG. 2, the thickness adjusting member 24 may be arranged so as to vertically overlap the upper side of the elastic body 22. Further, as shown in FIG. 3, each load supporting member 20 may have two elastic bodies 22, and the thickness adjusting member 24 may be arranged so as to vertically overlap the two elastic bodies 22 while being sandwiched between the two elastic bodies 22. As shown in FIG. 4, each load supporting member 20 may have two thickness adjusting members 24, and the two thickness adjusting members 24 may be arranged so as to vertically overlap the elastic body 22 while sandwiching the elastic body 22. As shown in FIG. 5, each load supporting member 20 may have a plurality of elastic bodies 22 and a plurality of thickness adjusting members 24, and the elastic bodies 22 and the thickness adjusting members 24 may be arranged so as to vertically overlap alternately. Since the elastic body uses a relatively expensive material, from the viewpoint of cost, it is preferable that the thickness of the elastic body 22 is thinner.

[0029] (Area ratio of the load supporting member 20) As shown in FIG. 1, the ratio of the total area of the upper surfaces of all the load supporting members 20 to the total area of the upper surface of the entire buffer body 14 excluding the vibration insulating portion 18f (hereinafter referred to as the area ratio of the load supporting member 20) is 1% to 3%, preferably 1% to 2.5%, more preferably 1% to 2%. In other words, the ratio of the total area of the openings of all the accommodation holes 18h to the total area of the upper surface of the entire buffer body 14 excluding the vibration insulating portion 18f is 1% or more and 3% or less. The area ratio of the load supporting member 20 is set to 1% or more because when the area ratio of the load supporting member 20 is less than 1%, it is difficult for the plurality of load supporting members 20 to sufficiently support the loading weight of the floating floor portion 16. The area ratio of the load supporting member 20 is set to 3% or less because when the area ratio of the load supporting member 20 exceeds 3%, the occupancy rate of the thickness adjusting member 24, which is a rigid member in the buffer body 14, increases, and the vibration isolation performance of the buffer body 14 tends to decrease.

[0030] Subsequently, the material and physical properties of the buffer body 14 will be described.

[0031] (Manufacture of the material of the buffer body main body 18) The polyolefin resin foam, which is the material of the buffer body main body 18 shown in FIG. 1, may be manufactured by either the bead foaming method or the extrusion foaming method. The polyolefin resin foam is preferably manufactured by the bead foaming method in terms of manufacturing cost.

[0032] A dense and smooth skin layer is formed on the entire surface of the polyolefin resin foam manufactured by the bead foaming method. Therefore, in the polyolefin resin foam manufactured by the bead foaming method, there is less generation of scraps, and the strength of the buffer body main body 18 can be improved.

[0033] When manufacturing a polyolefin resin foam by the bead foaming method, first, foaming particles obtained by foaming a polyolefin resin into beads are filled into a molding die. Subsequently, the molding die is heated to a predetermined temperature and then cooled. Then, the molding die is opened, and the polyolefin resin foam is taken out.

[0034] When manufacturing a polyolefin resin foam by the extrusion foaming method, first, a polyolefin resin composition added with a cell regulator and a flame retardant as required is supplied to an extruder and heated and melted by the extruder. Subsequently, a foaming agent is press-fitted into the melted polyolefin resin composition, and it is kneaded while being further heated and melted to generate a uniform flow composition. Then, the uniform flow composition is extruded from the die orifice at the tip of the flat die and passed through a shaping device called a guide to take out the olefin resin foam.

[0035] (Form of the material of the buffer body main body 18) The polyolefin resin foam, which is the material of the buffer body main body 18, may have a skin or may be sliced. The polyolefin resin foam may be laminated with an adhesive or an adhesive tape, etc. The shape of the polyolefin resin foam is not particularly limited, but a plate shape or a block shape is preferable because it is easy to process.

[0036] (Polyolefin resin constituting the material of the buffer body main body 18) Specific examples of the polyolefin resin that constitutes the polyolefin resin foam which is the material of the buffer body main body 18 include, for example, polyethylene resins mainly composed of ethylene such as high-density polyethylene, medium-density polyethylene, low-density polyethylene, linear low-density polyethylene, etc., and polypropylene resins mainly composed of propylene. These polyolefin resins may be used alone or in combination of two or more. Among these polyolefin resins, polyethylene resins mainly composed of polyethylene are preferable in that the buffer body 14 can sufficiently exhibit the desired vibration-proof performance.

[0037] Specific examples of the monomer of the polyolefin resin (hereinafter, may also be referred to as an olefin monomer) include, for example, α-olefins having 2 to 12 carbon atoms such as ethylene, propylene, butene-1, isobutene, pentene-1, 3-methyl-butene-1, hexene-1, 4-methyl-pentene-1, 3,4-dimethyl-butene-1, heptene-1, 3-methyl-hexene-1, octene-1, decene-1, etc. These may be used alone or in combination of two or more.

[0038] In addition, other monomers having copolymerizability with the olefin monomer include, for example, cyclic olefins such as cyclopentene, norbornene, 1,4,5,8-dimethano-1,2,3,4,4a,8,8a,6-octahydronaphthalene, and dienes such as 5-methylene-2-norbornene, 5-ethylidene-2-norbornene, 1,4-hexadiene, methyl-1,4-hexadiene, 7-methyl-1,6-octadiene, etc. These may be used alone or in combination of two or more.

[0039] (Additives for the material of the buffer body main body 18) The polyolefin resin foam that is the material of the buffer body main body 18 may contain various additives such as an antistatic agent, a cell regulator, a flame retardant, a flame retardant aid, and a filler as required. In particular, in order to improve the creep characteristics of the buffer body main body 18, the polyolefin resin foam preferably contains an inorganic filler. Examples of the inorganic filler include calcium carbonate, talc, silica, clay, wollastonite, potassium titanate, alumina, mica, or glass balloons. The content of the inorganic filler can be appropriately set according to the required creep characteristics.

[0040] (Physical properties, etc. of the buffer body main body 18) The dynamic spring constant of the buffer body main body 18 (polyolefin resin foam) is 2×10 6 N / m 3 ~10×10 6 N / m 3 Preferably 5×10 6 N / m 3 ~10×10 6 N / m 3 More preferably 7×10 6 N / m 3 ~9×10 6 N / m 3 is. The dynamic spring constant of the buffer body main body 18 is set to 2×10 6 N / m 3 or more because it becomes difficult to sufficiently support the load of the floating floor portion 16 by the buffer body 14 if the dynamic spring constant of the buffer body main body 18 is less than 2×10 6 N / m 3 . The dynamic spring constant of the buffer body main body 18 is set to 10×10 6 N / m 3 or less because it becomes difficult to suppress the vibration transmitted between the floor slab 12 and the floating floor portion 16 if the dynamic spring constant of the buffer body main body 18 exceeds 10×10 6 N / m 3 .

[0041] The static spring constant of the buffer body main body 18 is 6×10 6 N / m 3 ~8×10 6 N / m3 Preferably, it is 6.5×10 6 N / m 3 ~8×10 6 N / m 3 More preferably, it is 7×10 6 N / m 3 ~8×10 6 N / m 3 That is. The dynamic spring constant of the buffer body 18 is 6×10 6 N / m 3 The reason for setting it above is that if the static spring constant of the buffer body 18 is less than 6×10 6 N / m 3 it will be too soft and it will be difficult for the buffer body 18 to sufficiently support the load on the floating floor portion 16. The reason for setting the static spring constant of the buffer body 18 below 8×10 6 N / m 3 is that if the static spring constant of the buffer body 18 exceeds 8×10 6 N / m 3 the buffer body 18 will become too hard and the vibration isolation performance of the buffer 14 (buffer body 18) will tend to deteriorate.

[0042] The thickness of the buffer body 18 is 25 mm to 200 mm, preferably 50 mm to 100 mm. The reason for setting the thickness of the buffer body 18 to 25 mm or more is that if the thickness of the buffer body 18 is less than 25 mm, the vibration isolation performance of the buffer 14 will tend to deteriorate. The reason for setting the thickness of the buffer body 18 to less than 200 mm is that although the vibration isolation performance of the buffer 14 tends to improve when the thickness of the buffer body 18 becomes 200 mm or more, the cost of the buffer 14 tends to increase.

[0043] The bulk density of the polyolefin resin foam, which is the material of the buffer body 18, is 12 kg / m 3 ~20 kg / m 3 Preferably, it is 13 kg / m 3 ~18 kg / m 3 More preferably, it is 14 kg / m 3 ~16 kg / m 3 That is. The reason for the bulk density of the polyolefin resin foam being 12 kg / m 3The reason for setting the above is that if the bulk density of the polyolefin resin foam is less than 20 kg / m 3 , it is impossible to ensure sufficient strength for the buffer body main body 18 to support the loading weight of the floating floor portion 16. The reason for setting the bulk density of the polyolefin resin foam to 20 kg / m 3 or less is that if the bulk density of the polyolefin resin foam exceeds 20 kg / m 3 , the buffer body main body 18 becomes too hard, and it becomes difficult for the buffer body 14 to exhibit the desired vibration damping performance and sound insulation performance because the dynamic spring constant of the buffer body main body 18 exceeds 10×10 6 N / m 3 .

[0044] The closed cell ratio of the polyolefin resin foam, which is the material of the buffer body main body 18, is not particularly limited, but is preferably 80% or more. When the closed cell ratio of the polyolefin resin foam is 80% or more, the dynamic spring constant of the buffer body main body 18 can be easily set to 2×10 6 N / m 3 ~10×10 6 N / m 3 .

[0045] (Material and physical properties of the elastic body 22, etc.) The elastic body 22 is made of high-density polyurethane foam, and in particular, is made of ether-based high-density polyurethane foam. By using high-density polyurethane foam as the material of the elastic body 22, it is possible to achieve both vibration damping performance and load-bearing performance by the buffer body 14. In particular, by using ether-based high-density polyurethane foam as the material of the elastic body 22, the water resistance of the buffer body 14 can be improved.

[0046] The ratio of the volume of the elastic body 22 to the volume of each load support member 20 (hereinafter referred to as the volume ratio of the elastic body 22) is 20% to 60%, preferably 25% to 50%, and more preferably 30% to 50%. The volume ratio of the elastic body 22 is set to 20% or more because when the volume ratio of the elastic body 22 is less than 20%, the occupancy rate of the thickness adjustment member 24, which is a rigid member in the buffer body 14, increases, and the vibration isolation performance of the buffer body 14 tends to decrease. The volume ratio of the elastic body 22 is set to 60% or less because when the volume ratio of the elastic body 22 exceeds 60%, the amount of distortion of the elastic body 22 with respect to the loading weight of the floating floor portion 16 increases, and the buffer body main body 18 is crushed, and the vibration isolation performance of the buffer body 14 tends to decrease. When the volume ratio of the elastic body 22 exceeds 60%, the amount of use of the elastic body 22 increases, and the construction cost of the floating floor structure 10 tends to increase.

[0047] The dynamic spring constant of the elastic body 22 is 1×10 6 N / m 3 ~7×10 6 N / m 3 、preferably 1.2×10 6 N / m 3 ~5×10 6 N / m 3 、more preferably 1.5×10 6 N / m 3 ~3×10 6 N / m 3 . By setting the dynamic spring constant of the elastic body 22 within such a numerical range, the vibration transmitted between the floor slab 12 and the floating floor portion 16 can be suppressed, and the buffer body 14 can exhibit the desired vibration isolation performance.

[0048] The static spring constant of the elastic body 22 is 15×10 6 N / m 3 ~200×10 6 N / m 3 Hereinafter, preferably 50×10 6 N / m 3 ~150×10 6 N / m 3 、more preferably 75×10 6 N / m 3 ~100×10 6 N / m 3is as follows. The static spring constant of the elastic body 22 is set to be 15×10 6 N / m 3 or more because if the static spring constant of the elastic body 22 is less than 15×10 6 N / m 3 , the hardness of the elastic body 22 cannot be ensured sufficiently, the elastic body 22 cannot support the load on the floating floor portion 16 sufficiently, the buffer body main body 18 is crushed, and it becomes difficult for the buffer body 14 to exhibit the desired vibration isolation performance. If the static spring constant of the elastic body 22 is less than 15×10 6 N / m 3 , it becomes difficult to construct the floating floor structure 10 as designed. The static spring constant of the elastic body 22 is set to 200×10 6 N / m 3 or less because if the static spring constant of the elastic body 22 exceeds 200×10 6 N / m 3 , although the elastic body 22 can support the load on the floating floor portion 16 sufficiently, the elastic body 22 becomes too hard and the vibration isolation performance of the buffer body main body 18 tends to deteriorate.

[0049] The density of the elastic body 22 is 300 Kg / m 3 ~800 Kg / m 3 , preferably 300 Kg / m 3 ~750 Kg / m 3 . The density of the elastic body 22 is set to 300 Kg / m 3 or more because if the density of the elastic body 22 is less than 300 Kg / m 3 , the elastic body 22 cannot ensure sufficient hardness to support the load on the floating floor portion 16. The density of the elastic body 22 is set to 800 Kg / m 3 or less because if the density of the elastic body 22 exceeds 800 Kg / m 3 , the elastic body 22 becomes too hard and it becomes difficult for the buffer body 14 to exhibit the desired vibration isolation performance and sound insulation performance.

[0050] (Material of the thickness adjustment material 24) The material of the thickness adjuster 24 may be any material that is rigid (high rigidity) enough not to be deformed by the loading weight of the floating floor portion 16. The thickness adjuster 24 is made of at least one material selected from the group of concrete, metal, wood, and synthetic resin. Examples of the synthetic resin used as the material of the thickness adjuster 24 include polyvinyl chloride, polyethylene, polypropylene, polyester, polystyrene, polyamide, or ABS resin. These resins may contain reinforcing materials such as fillers and additives such as antioxidants. The synthetic resin used as the material of the thickness adjuster 24 may be foamed at a low expansion ratio, for example, as long as it can maintain rigidity, and it does not have to be solid.

[0051] (Characteristics of the floating floor structure 10) When the thickness of the buffer body 14 excluding the vibration isolation portion 18f is 50 mm, the natural frequency of the buffer body 14 is preferably less than 30 Hz. This is because when the natural frequency of the buffer body 14 becomes 30 Hz or more, it becomes difficult for the buffer body 14 to sufficiently exhibit the desired vibration isolation performance.

[0052] The amount of distortion (sinking) of the buffer body 14 due to the loading weight of the floating floor portion 16 is preferably less than 10% of the initial thickness of the buffer body 14. This is because when the amount of distortion of the buffer body 14 becomes 10% or more of the initial thickness of the buffer body 14, it becomes difficult to keep the sinking of the floating floor structure 10 within the allowable range while the buffer body 14 exhibits the desired vibration isolation performance.

[0053] (Function and effect) Subsequently, the function and effect of the present embodiment will be described.

[0054] As described above, the buffer body main body 18 is made of a polyolefin-based resin foam, and the thickness adjuster 24 is disposed in each accommodation hole 18h of the buffer body main body 18 so as to overlap the elastic body 22 vertically. The dynamic spring constant of the buffer body main body 18 is 10×10 6 N / m 3 or less, and the dynamic spring constant of the elastic body 22 is 7×10 6 N / m 3The following is the case. Therefore, while sufficiently ensuring the load-bearing performance of the buffer body 14 (floating floor structure 10), the vibration isolation performance and sound insulation performance of the buffer body 14 can be improved.

[0055] Moreover, since the volume ratio of the elastic body 22 is 20% - 60%, while suppressing the deterioration of the vibration isolation performance of the buffer body 14, the amount of the elastic body 22 used can be reduced, and the construction cost of the floating floor structure 10 can be reduced.

[0056] That is, according to the present embodiment, while reducing the construction cost of the floating floor structure 10, the load-bearing performance of the floating floor structure 10 can be sufficiently ensured, and the vibration isolation performance and sound insulation performance of the floating floor structure 10 can be improved.

[0057] Particularly, since the static spring constant of the buffer body main body 18 is smaller than the static spring constant of the elastic body 22, the buffer body main body 18 can support the loading load of the floating floor portion 16 without hindering the vibration isolation effect of the load support member 20. Thereby, according to the present embodiment, the load-bearing performance and vibration isolation performance of the floating floor structure 10 can be further improved.

Example

[0058] Examples and comparative examples of the present invention will be described. Note that the floating floor structure of the present invention is not limited to the descriptions of the examples and comparative examples.

[0059] (Examples 1 - 5) Bulk density 18.4 Kg / m 3A buffer body made of a polyethylene resin foam (Vibran E-60 manufactured by Tokyo Buitech Co., Ltd., closed cell ratio 92%) (length 1 m × width 1 m × thickness 50 mm), and a load support material filled and disposed in the accommodation hole at the center of the buffer body were used to prototype Test Specimens 1 to 4. Test Specimens 1 to 4 are test specimens that simulate the floating floor structure 10 according to this embodiment, and are the test specimens of Examples 1 to 4. The dimensions of the load support material in Test Specimens 1 to 4 are the dimensions in the cases of Examples 1 to 4 shown in Table 1. The elastic body of the load support material in Test Specimens 1 to 4 is made of a polyurethane resin elastomer (Cell Dunper BF-500 manufactured by Inoac Corporation). The thickness adjustment material of the load support material in Test Specimens 1 to 4 is made of synthetic wood with a foaming ratio of 3 times made of a polystyrene resin.

[0060] Bulk density 12.5 Kg / m 3 A buffer body made of a polyethylene resin foam (Vibran E-75 manufactured by Tokyo Buitech Co., Ltd., closed cell ratio 88%) (length 1 m × width 1 m × thickness 50 mm), and a load support material filled and disposed in the accommodation hole at the center of the buffer body were used to prototype Test Specimen 5. Test Specimen 5 is a test specimen that simulates the floating floor structure 10 according to this embodiment, and is the test specimen of Example 5. The dimensions of the load support material in Test Specimen 5 are the dimensions in the case of Example 5 shown in Table 1. The elastic body of the load support material in Test Specimen 5 is made of a polyurethane resin elastomer (Cell Dunper BF-700 manufactured by Inoac Corporation). The thickness adjustment material of the load support material in Test Specimen 5 is made of synthetic wood with a foaming ratio of 3 times made of a polystyrene resin.

[0061] From Table 1, the area ratio of the load support material in Test Specimens 1, 2, and 5 is (100 mm × 100 mm) / (1000 mm × 1000 mm) × 100 = 1.00%. Also, the area ratio of the load support material in Test Specimens 3 and 4 is (141 mm × 141 mm) / (1000 mm × 1000 mm) × 100 = 2.00%.

[0062] (Comparative Examples 1 to 6) Comparative Example 1: A comparative test specimen 1 was prototyped in the same manner as in Example 1, except that an elastic body with a length of 100 mm × width of 100 mm × thickness of 50 mm was used as the load support material and no thickness adjustment material was used.

[0063] Comparative Example 2: A comparative test specimen 2 was prototyped in the same manner as in Comparative Example 1, except that an elastic body with a length of 70.7 mm × width of 70.7 mm × thickness of 50 mm was used as the load support material.

[0064] Comparative Example 3: A comparative test specimen 3 was prototyped in the same manner as in Example 1, except that a member composed of an elastic body with a length of 70.7 mm × width of 70.7 mm × thickness of 25 mm and a thickness adjustment material with a length of 70.7 mm × width of 70.7 mm × thickness of 25 mm was used as the load support material.

[0065] Comparative Example 4: A comparative test specimen 4 was prototyped in the same manner as in Example 1, except that a thickness adjustment material with a length of 100 mm × width of 100 mm × thickness of 50 mm was used as the load support material and no elastic body was used.

[0066] Comparative Example 5: A buffer body main body (length 1 m × width 1 m × thickness 50 mm) made of a polyethylene resin foam with a bulk density of 24.2 Kg / m 3 (Vibran E-38 manufactured by Tokyo Buitek Co., Ltd., closed cell ratio 95%) was used, and a comparative test specimen 5 was prototyped in the same manner as in Example 1.

[0067] Comparative Example 6: A comparative test specimen 6 was prototyped, which included a buffer body main body (length 1 m × width 1 m × thickness 50 mm) made of a polyethylene resin foam with a bulk density of 12.5 Kg / m 3 (Vibran E-75 manufactured by Tokyo Buitek Co., Ltd., closed cell ratio 88%) and a load support material disposed by filling the accommodation hole in the central portion of the buffer body main body. In Comparative Test Specimen 6, an elastic body with a length of 70.7 mm × width of 70.7 mm × thickness of 50 mm was used as the load support material, and no thickness adjustment material was used. The elastic body of the load support material of Comparative Test Specimen 6 was made of a polyurethane resin elastomer (Cell Dunper BF-700 manufactured by Inoac Corporation).

[0068] Note that, from Table 1, the area ratio of the load support material in Comparative Specimens 1, 4, and 5 is (100 mm × 100 mm) / (1000 mm × 1000 mm) × 100 = 1.00%. Also, the area ratio of the load support material in Comparative Specimens 2, 3, and 6 is (70.7 mm × 70.7 mm) / (1000 mm × 1000 mm) × 100 = 0.50%.

[0069] (Dimensions of Specimens and Comparative Specimens, etc.) For the length and width of the buffer body main body, etc. in Specimens 1 to 5 and Comparative Specimens 1 to 6, dimensional measurements were carried out using a measuring tape. For the thickness of the buffer body main body, etc. in Specimens 1 to 5 and Comparative Specimens, dimensional measurements were carried out using a dial gauge.

[0070] The bulk density of the polyethylene-based resin foam, which is the material of the buffer body main body in Specimens 1 to 5 and Comparative Specimens 1 to 6, was calculated by dividing the weight of the polyolefin-based resin foam by the volume. The closed-cell ratio of the polyethylene-based resin foam was determined by the method described in ASTM D 2856.

[0071] (Natural Frequency of Floating Floor Structure) Using Specimens 1 to 5 and Comparative Specimens 1 to 6, based on the measurement method specified in JIS A 6322, the damped vibration waveform was measured, the period was read from three adjacent peaks of the damped vibration waveform that became free vibration, and the natural frequency of the floating floor structure was determined from the average value. Note that a load plate was placed on each of Specimens 1 to 5 and Comparative Specimens 1 to 6 so that the loading load was 550 Kg / m 2 The evaluation criteria for the natural frequency of the floating floor structure (buffer body) in the cases of Examples 1 to 5 and Comparative Examples 1 to 6 were as follows.

[0072] ◎: Less than 23 Hz ○: 23 Hz or more and less than 30 Hz △: 30 Hz or more and less than 50 Hz ×: 50 Hz or more (Dynamic Spring Constant) In accordance with JIS A 6322, it was calculated using the natural frequency obtained by the above method according to the following formula. In the formula, fn is the natural frequency (Hz), Kd is the dynamic spring constant (N / m 3 ), and B is the mass per unit area (Kg / m 2 ).

[0073] fn = 1 / (2π)√(Kd / B) (Amount of distortion of the floating floor structure) Load plates were placed on Test Specimens 1 to 5 and Comparative Test Specimens 1 to 6 so that the load became 550 Kg / m 2 . Dial gauges were attached to the four corners of Test Specimens 1 to 5 and Comparative Test Specimens 1 to 6, and the displacement amounts in the thickness direction were measured over time. After placing the load plates, the displacement amount (amount of distortion) of the upper surface of the buffer body after 100 days was used as a reference for the height position of the upper surface of the buffer body after 1 day, and was used as an index for load resistance. The evaluation criteria for the deflection amounts of the floating floor structures (buffer bodies) in the cases of Examples 1 to 5 and Comparative Examples 1 to 6 were as follows.

[0074] ◎: Amount of distortion less than 2.5 mm (less than 5%) ○: Amount of distortion 2.5 mm or more and less than 5 mm (5% or more and less than 10%) ×: Amount of distortion 5 mm or more (10% or more) (Construction cost of the floating floor structure) Based on the volume of the elastic body used per square meter of the buffer body, the following evaluation index was used. The evaluation criteria for the construction costs of the floating floor structures in the cases of Examples 1 to 5 and Comparative Examples 1 to 6 were as follows. 2

[0075] ◎: 1.25×10 5 mm 3 or less ○: Exceeding 1.25×10 5 mm 3 and up to 2.50×10 5 mm 3 or less △: Exceeding 2.50×10 5 mm 3 and up to 5.00×10 5 mm3 The following ×: 5.00×10 5 mm 3 exceeding The evaluation results and comprehensive evaluations of Test Specimens 1 to 5 and Comparative Test Specimens 1 to 6 are shown in Table 1. The comprehensive evaluation is based on the following criteria.

[0076] ◎: The evaluation of the natural frequency is "◎", and the evaluations of the strain amount and construction cost are "○" or higher. ○: The evaluations of the natural frequency, strain amount, and construction cost are "△" or higher. ×: The evaluation of one of the natural frequency, strain amount, and construction cost is "×".

[0077]

Table 1

[0078] (Comprehensive evaluation for Examples 1 to 5) As shown in Table 1, in the case of Example 1, the evaluation of the natural frequency of the floating floor structure was ◎, the evaluation of the strain amount of the floating floor structure was ○, and the evaluation of the construction cost of the floating floor structure was ○. In the case of Example 1, the comprehensive evaluation of the floating floor structure was ◎.

[0079] In the case of Example 2, the evaluation of the natural frequency of the floating floor structure was ○, the evaluation of the strain amount of the floating floor structure was ◎, and the evaluation of the construction cost of the floating floor structure was ◎. In the case of Example 2, the comprehensive evaluation of the floating floor structure was ○.

[0080] In the case of Example 3, the evaluation of the natural frequency of the floating floor structure was ○, the evaluation of the strain amount of the floating floor structure was ◎, and the evaluation of the construction cost of the floating floor structure was ○. In the case of Example 3, the comprehensive evaluation of the floating floor structure was ○.

[0081] In the case of Example 4, the evaluation of the natural frequency of the floating floor structure was ○, the evaluation of the amount of distortion of the floating floor structure was ◎, and the evaluation of the construction cost of the floating floor structure was △. In the case of Example 4, the overall evaluation of the floating floor structure was ○.

[0082] In the case of Example 5, the evaluation of the natural frequency of the floating floor structure was ◎, the evaluation of the amount of distortion of the floating floor structure was ◎, and the evaluation of the construction cost of the floating floor structure was 〇. In the case of Example 5, the overall evaluation of the floating floor structure was ◎.

[0083] (Overall evaluation in the cases of Comparative Examples 1 to 6) As shown in Table 1, in the case of Comparative Example 1, the evaluation of the natural frequency of the floating floor structure was ◎, the evaluation of the amount of distortion of the floating floor structure was ×, and the evaluation of the construction cost of the floating floor structure was △. In the case of Comparative Example 1, the overall evaluation of the floating floor structure was ×.

[0084] In the case of Comparative Example 2, the evaluation of the natural frequency of the floating floor structure was ◎, the evaluation of the amount of distortion of the floating floor structure was ×, and the evaluation of the construction cost of the floating floor structure was ○. In the case of Comparative Example 2, the overall evaluation of the floating floor structure was ×.

[0085] In the case of Comparative Example 3, the evaluation of the natural frequency of the floating floor structure was ◎, the evaluation of the amount of distortion of the floating floor structure was ×, and the evaluation of the construction cost of the floating floor structure was ◎. In the case of Comparative Example 3, the overall evaluation of the floating floor structure was ×.

[0086] In the case of Comparative Example 4, the evaluation of the natural frequency of the floating floor structure was ×, the evaluation of the amount of distortion of the floating floor structure was ○, and the evaluation of the construction cost of the floating floor structure was ◎. In the case of Comparative Example 4, the overall evaluation of the floating floor structure was ×.

[0087] In the case of Comparative Example 5, the evaluation of the natural frequency of the floating floor structure was ×, the evaluation of the amount of distortion of the floating floor structure was ○, and the evaluation of the construction cost of the floating floor structure was 〇. In the case of Comparative Example 5, the overall evaluation of the floating floor structure was ×.

[0088] In the case of Comparative Example 6, the evaluation of the natural frequency of the floating floor structure was ◎, the evaluation of the amount of distortion of the floating floor structure was ×, and the evaluation of the construction cost of the floating floor structure was ○. In the case of Comparative Example 6, the overall evaluation of the floating floor structure was ×.

[0089] (Summary) As in the case of Examples 1 to 5, when the dynamic spring constant of the buffer body main body is 10×10 6 N / m 3 or less and the dynamic spring constant of the elastic body is 7×10 6 N / m 3 or less, it has been found that the vibration isolation performance of the floating floor structure can be improved while sufficiently ensuring the load-bearing performance of the floating floor structure. Also, as in the case of Comparative Example 3, when the dynamic spring constant of the elastic body exceeds 7×10 6 N / m 3 , it has been found that the load-bearing performance of the floating floor structure deteriorates. As in the case of Comparative Example 5, when the dynamic spring constant of the buffer body main body exceeds 10×10 6 N / m 3 , it has been found that the vibration isolation performance of the floating floor structure deteriorates.

Explanation of Signs

[0090] 10 Floating floor structure 12 Floor slab 14 Buffer 16 Floating floor part 18 Buffer body main body 18h Accommodation hole 18f Vibration isolation part 20 Load support material 22 Elastic body 24 Thickness adjustment material

Claims

1. In a floating floor structure including a buffer body disposed on a floor slab and a floating floor portion disposed on the buffer body, the buffer body is composed of a polyolefin-based resin foam, and includes a buffer body main body having accommodation holes formed to penetrate in the vertical direction, and a load support member disposed in the accommodation holes of the buffer body main body and configured to support the load of the floating floor portion as the buffer body main body is compressed and deformed due to the load of the floating floor portion. The load support member is an elastic body, and a thickness adjustment member disposed so as to overlap the elastic body in the vertical direction, configured to be more rigid than the buffer body main body and the elastic body, and to adjust the thickness of the load support member. The dynamic spring constant of the buffer body main body at a load of 550 kg / m2 is 10×10 ６ N / m ３ or less, and the dynamic spring constant of the elastic body at a load of 550 kg / m2 is 7×10 ６ N / m ３ or less. The floating floor structure.

2. The dynamic spring constant of the elastic body at a load of 550 kg / m2 is 1×10 ６ N / m ３ or more. The floating floor structure according to claim 1.

3. The ratio of the volume of the elastic body to the volume of each load support member is 20% to 60%. The floating floor structure according to claim 1 or 2.

4. The dynamic spring constant of the buffer body main body at a load of 550 kg / m2 is 2×10 ６ N / m ３ or more. The floating floor structure according to any one of claims 1 to 3.

5. The ratio of the total upper surface area of all the load support members to the upper surface area of the entire upper surface of the buffer body is 1% to 3%. The floating floor structure according to any one of claims 1 to 4.

6. The elastic body is made of high-density polyurethane foam, and the density of the elastic body is 300 Kg / m ３ to 800 Kg / m ３ The floating floor structure according to any one of claims 1 to 5.

7. The thickness adjusting material is made of at least one material selected from the group consisting of concrete, metal, wood, and synthetic resin. The floating floor structure according to any one of claims 1 to 6.

8. The bulk density of the polyolefin resin foam, which is the material of the buffer body main body, is 12 Kg / m ３ to 20 Kg / m ３ and The closed cell ratio of the polyolefin resin foam is 80% or more. The floating floor structure according to any one of claims 1 to 7.

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