JP2020172770A - Floor structure - Google Patents

Abstract

To provide a floor structure capable of improving sound insulation performance at a step portion formed on a floor in a building.SOLUTION: A building 10 is provided with: a general floor portion 30; a bath room floor portion 56 adjacent to the general floor portion 30 and lower in a floor height than that of the general floor portion 30; a sound insulation sheet 76 arranged along a vertical direction of the building and covering a step portion 62 created between the general floor portion and the bath room floor portion 56.SELECTED DRAWING: Figure 1

Description

The present invention relates to a floor structure.

Patent Document 1 discloses a floor structure including an upper floor portion (general floor portion) and a lower floor portion (lower floor portion) adjacent to the upper floor portion and having a floor height lower than that of the upper floor portion. Further, in the document, a sound insulating material is arranged between the upper flange and the lower flange of H steel that supports the upper floor portion from the lower side to suppress sound leakage caused by the step portion between the upper floor portion and the lower floor portion. However, a configuration for improving the sound insulation performance of the floor structure is disclosed.

Japanese Unexamined Patent Publication No. 2012-0292524

However, in the prior art, since the sound insulating material cannot be arranged on the lower side of the H steel, the sound insulating performance is lowered at the portion located on the lower side of the H steel in the step portion. Therefore, the above prior art has room for improvement in this respect.

In consideration of the above facts, an object of the present invention is to obtain a floor structure capable of improving the sound insulation performance of a step portion formed on a floor portion in a building.

The floor structure according to the first aspect is arranged with an upper floor portion, a lower floor portion adjacent to the upper floor portion and a floor height lower than the upper floor portion, along the vertical direction of the building, and the upper floor portion and the said. It is provided with a sound insulating material that covers a step portion formed between the floor and the lower floor.

In the floor structure according to the first aspect, since the sound insulating material is arranged so as to cover the stepped portion between the upper floor portion and the lower floor portion, the sound insulating material is filled between the upper floor portion and the lower floor portion. As a result, the sound insulation performance of the stepped portion is improved.

In the floor structure according to the second aspect, in the configuration described in the first aspect, the upper floor portion and the lower floor portion are made of a fireproof material, and between the sound insulating material and the upper floor portion and the lower floor portion. Is a structure in which a fireproof material covering a step portion generated between the upper floor portion and the lower floor portion is arranged along the vertical direction of the building, and the sound insulation material is in close contact with the fireproof material at the step portion. ..

In the floor structure according to the second aspect, since the sound insulating material is arranged in close contact with the fire insulating material arranged so as to cover the step portion, the sound insulating performance of the step portion is further improved by the fire insulating material also serving as the sound insulating material. To do. Further, since the upper floor portion and the lower floor portion made of the fire prevention material and the fire prevention material can form a continuous fire prevention section, the fire prevention performance of the building is improved.

In the floor structure according to the third aspect, in the configuration described in the first aspect or the second aspect, the sound insulating material is formed in a sheet shape, and the surfaces in contact with the upper floor portion and the lower floor portion are adhered to each other. It is composed of a sound insulating sheet having a property.

In the floor structure according to the third aspect, the stepped portion can be easily covered by bringing the adhesive surface of the sound insulating material made of the sound insulating sheet into contact with the upper floor portion and the lower floor portion. In addition, since the sound insulating material can be positioned on the adhesive surface, it is excellent in workability.

The floor structure according to the fourth aspect has the configuration according to any one of the first to third aspects, wherein the upper end portion of the sound insulation material is supported by the upper floor portion and stands on the upper side of the building. It is fixed to the wall of the installed building.

In the floor structure according to the fourth aspect, the boundary between the wall erected from the upper floor portion and the upper floor portion can be covered with a sound insulating material. As a result, it is possible to suppress sound leakage that occurs between the upper floor and the wall in addition to the stepped portion, and it is possible to further enhance the soundproofing performance of the building by the sound insulating material. Further, by securing the fixing portion of the sound insulating material on the wall surface of the wall, the sound insulating material can be easily attached.

The floor structure according to the fifth aspect has the configuration according to any one of the first to third aspects, wherein the upper end portion of the sound insulating material is supported by the upper floor portion and the upper floor portion. It is fixed by being sandwiched between the wall of the building erected on the upper side of the building.

In the floor structure according to the fifth aspect, since the upper end portion of the sound insulating material is fixed to the upper floor portion together with the wall, a gap is less likely to occur between the sound insulating material and the upper floor portion. As a result, the sound insulation effect of the stepped portion is further improved.

The floor structure according to the sixth aspect has the configuration described in any one of the first to fifth aspects, wherein the upper floor portion is a general floor portion of a general living room of a building, and the lower floor portion. Is the bathroom floor of the bathroom adjacent to the general living room, and the bottom wall of the bathroom unit installed inside the bathroom at a predetermined interval is arranged on the upper side of the building of the bathroom floor. There is.

In the floor structure according to the sixth aspect, a bathroom floor having a floor height lower than the floor of the general living room is provided in the bathroom adjacent to the general living room, and a step is generated between the general floor and the bathroom floor. are doing. In a bathroom with such a floor structure, the floor height inside the bathroom unit is set lower than when the bathroom unit is installed on the bathroom floor having the same floor height as the general floor, and the height difference from the general floor is reduced. It becomes possible to do. As a result, the bathroom can be made barrier-free.

By the way, for example, when a bathroom having the above configuration is formed on the upper floor of a multi-story building, the bathroom floor of the bathroom becomes closer to the ceiling of the lower floor. Further, usually, a space for arranging a drain pipe or the like is formed between the bathroom floor of the bathroom and the bottom wall of the bathroom unit. For this reason, the sound generated in the bathroom unit is likely to reverberate in the above space, so that sound leakage to the lower floor is likely to occur.

Therefore, in the present invention, it is possible to contribute to the improvement of the sound insulation performance in the building by filling the step portion generated between the general floor portion and the bathroom floor portion with the sound insulation material in such a bathroom.

As described above, according to the floor structure according to the first aspect, there is an excellent effect that the sound insulation performance can be improved in the stepped portion formed on the floor portion in the building.

According to the floor structure according to the second aspect, it has an excellent effect that the sound insulation performance of the step portion formed on the floor portion in the building can be improved, and further, the fire prevention performance can be improved.

According to the floor structure according to the third aspect, it has an excellent effect of facilitating the attachment of the sound insulating material.

According to the floor structure according to the fourth aspect, it has an excellent effect of improving the sound insulation of the stepped portion and facilitating the attachment of the sound insulation material.

According to the floor structure according to the fifth aspect, it has an excellent effect that the generation of a gap between the sound insulating material and the upper floor portion can be prevented and the sound insulating performance of the step portion can be further improved.

According to the floor structure according to the sixth aspect, it has an excellent effect that sound leakage generated in a barrier-free bathroom provided in a multi-story building can be effectively suppressed.

FIG. 5 is an enlarged cross-sectional view showing an enlarged region P shown in FIG. 3 in a bathroom to which the floor structure according to the first embodiment is applied. It is a top view of the bathroom to which the floor structure which concerns on 1st Embodiment is applied. It is sectional drawing which shows the state which cut along the 3-3 line of FIG. It is sectional drawing which shows the state which cut along the 4-4 line of FIG. FIG. 5 is an enlarged cross-sectional view showing an enlarged region Q shown in FIG. It is the bathroom to which the floor structure which concerns on 2nd Embodiment was applied, and is the enlarged sectional view corresponding to FIG. It is a figure which shows the floor structure as a comparative example.

[First Embodiment]
Hereinafter, the bathroom 12 of the building 10 to which the floor structure according to the first embodiment is applied will be described with reference to FIGS. 1 to 5.

(Structure of bathroom 12)
FIG. 2 shows a plan view of the bathroom 12 provided inside the building 10. Further, FIG. 3 shows a cross-sectional view of the western side surface of the bathroom 12 cut along the 3-3 line of FIG. Further, FIG. 4 shows a cross-sectional view of the north side surface of the bathroom cut along the line 4-4 of FIG.

As shown in these figures, the bathroom 12 of the building 10 is located on the south wall portion 14 arranged on the south side, the north wall portion 16 arranged on the north side, the east wall portion 18 arranged on the east side, and the west side. The arranged west wall portions 20 form a substantially rectangular shape in a plan view. Further, a bathroom unit 22 formed in a hollow rectangular parallelepiped shape is installed inside the bathroom unit 22. The building 10 is, for example, a multi-story building, and is an apartment house in which a plurality of units are provided adjacent to each floor in the building 10. Further, the bathroom 12 shown in each figure is a single-family bathroom provided on the upper floor 10A of the building 10.

The south wall portion 14 and the west wall portion 20 arranged on the south side and the west side of the bathroom 12 are regarded as general inner walls of the building. On the other hand, the north wall portion 16 and the east wall portion 18 arranged on the north side and the east side of the bathroom 12 are divided into partition walls, and partition the bathroom 12 from the living rooms 24 and 26 in the same house. The living rooms 24 and 26 provided adjacent to the bathroom 12 correspond to the "general living room" in the present invention, and the north wall portion 16 and the east wall portion 18 correspond to the "building wall" in the present invention.

As shown in FIGS. 3 and 4, the north wall portion 16 and the east wall portion 18 are supported by the general floor portions 30 of the living rooms 24 and 26 adjacent to the bathroom 12, respectively, and are erected on the upper side of the building. There is. The general floor portion 30 is formed by laying a panel made of ALC as a fireproof material. Further, on the floor surfaces of the living rooms 24 and 26, a floor base (reference numeral omitted) is laid on the upper side of the general floor portion 30, and a finishing material (code omitted) constituting the design surface is laid on the upper side of the floor base. It is formed by As an example, the floor base is composed of particle board, plywood, rental sound insulation mat, and the like. The general floor portion 30 corresponds to the "upper floor portion" in the present invention.

The fireproof material refers to a non-combustible material, a semi-non-combustible material, and a flame-retardant material specified in the Building Standards Act.

As partially illustrated in FIGS. 1 and 5, the north wall portion 16 and the east wall portion 18 include a pair of upper and lower runners 32 constituting a skeleton member, and a plurality of studs 34. The pair of runners 32 are fixed to the general floor portion 30 and the ceilings (not shown) of the living rooms 24 and 26, respectively, and are arranged so as to face each other in the vertical direction of the building and in parallel. Each runner 32 is configured as a substantially U-shaped long metal member that is open to the other runner side arranged so as to face each other in the vertical cross-sectional view. The pair of runners 32 are fixed to the general floor portion 30 and the ceiling by driving a plurality of screws into the surfaces of the general floor portion 30 and the living rooms 24 and 26 that come into contact with the ceiling.

As an example, the studs 34 are made of long metal members formed in a square tubular shape, and a plurality of studs 34 are arranged at predetermined intervals along the extending direction of the runner 32 with the building height direction as the longitudinal direction. ing. Further, the upper end portion and the lower end portion of the stud 34 are fitted to the pair of runners 32, respectively. The inner wall material 36 is fixed to the side surface of the stud 34 facing the living rooms 24 and 26 by using a fixing tool such as a screw. Further, on the upper layer of the inner wall material 36, a finishing material (not shown) constituting the design surface of the north wall portion 16 and the east wall portion 18 is arranged. On the other hand, in the present embodiment, since the bathroom unit 22 is installed inside the bathroom 12, the side surfaces of the north wall portion 16 and the east wall portion 18 facing the bathroom are not design surfaces. Therefore, only the inner wall material 36 is fixed to the side surface of the stud 34 facing the bathroom 12.

(Structure of bathroom unit 22)
As shown in FIGS. 2 to 4, the bathroom unit 22 has a side wall portion 38 erected so as to surround all four sides, a ceiling portion 40 connected to an upper end portion of the side wall portion 38, and a lower end portion of the side wall portion 38. It is formed in a hollow rectangular parallelepiped shape by the bottom wall portion 42 coupled with the above. Inside the bathroom unit 22, a bathtub 44 is provided on the west side of the bathroom 12, and a washing place 46 is provided on the east side of the bathroom adjacent to the bathtub 44. Further, an entrance / exit 48 of the bathroom unit 22 is formed on the side wall 38 located on the east side. The doorway 48 is connected to the opening 50 formed in the east wall portion 18 and communicates with the adjacent living room 26. That is, in the present embodiment, the living room 26 is a dressing room of the bathroom 12.

As shown in FIG. 4, the bottom wall portion 42 of the bathroom unit 22 has a washroom floor portion 42A on the east side, and constitutes the floor surface of the washroom 46. The washroom floor 42A is a sloped floor that slopes from one end on the east side toward the drainage port 52 formed in the center of the bottom wall 42. Further, in the bottom wall portion 42, a substantially half portion on the west side is a bathtub support portion 42B, and the bathtub 44 is supported from the lower side of the building via a connector (reference numeral omitted) fixed to the bottom surface of the bathtub 44.

The bathroom unit 22 having the above configuration is placed on the bathroom floor 56 of the bathroom 12 via a plurality of legs 54 fixed to the lower surface of the bottom wall 42. As a result, a space 58 is formed between the bottom wall portion 42 of the bathroom unit 22 and the bathroom floor portion 56. A drainage pipe 60 connected to the drainage port 52 is arranged in this space 58. Further, the bathroom floor portion 56 is formed by laying a panel made of lightweight cellular concrete (ALC) as a fireproof material, similarly to the general floor portion 30 described above. The bathroom floor 56 corresponds to the "lower floor" in the present invention.

As shown in FIGS. 3 and 4, the floor height of the bathroom floor 56 is set lower than the floor height of the general floor 30 of the living rooms 24 and 26 adjacent to the bathroom 12. As a result, a step portion 62 is formed between the general floor portion 30 of the living rooms 24 and 26 and the bathroom floor portion 56, and a gap in the building height direction is formed in the step portion 62.

In this way, when the bathroom unit 22 is installed on the bathroom floor 56 whose floor height is lower than that of the general floor 30, the floor height of the washing place 46 in the bathroom floor 56 is lowered by the height of the step 62. It is lowered to the side. For this reason, the height difference between the floor height of the living room 26 (dressing room) and the floor height of the washing room is reduced, and the bathroom 12 is a barrier-free bathroom. As an example, in the present embodiment, the floor height of the living room 26 and the floor height of the washing place are set to be substantially the same.

Explaining the support structure of the floor portion of the building 10 having the above configuration, the general floor portions 30 of the living rooms 24 and 26 extend along the horizontal direction and are supported by the floor beams 64 constituting the building frame from the lower side of the building. (See FIGS. 1, 3, 4, and 5). The floor beam 64 of the present embodiment is made of H-steel and includes a web portion 64A, an upper flange portion 64B, and a lower flange portion 64C. The web portion 64A is arranged along the height direction of the building in a vertical cross-sectional view of the floor beam 64. The upper flange portion 64B projects substantially horizontally from the upper end of the web portion 64A. The lower flange portion 64C projects substantially horizontally from the lower end of the web portion 64A, and is arranged so as to face the upper flange portion 64B. The general floor portion 30 is supported from the lower side of the building by the floor beam 64 by being placed on the upper flange portion 64B of the floor beam 64.

On the other hand, the bathroom floor portion 56 is supported by the floor beam 64 described above via a member. Specifically, the connecting member 66 is fixed to the web portion 64A on the floor beam 64 arranged along the peripheral edge of the panel-shaped bathroom floor portion 56. The connecting member 66 is composed of a bent plate body, and one end thereof is fastened to the web portion 64A by using a bolt 68 and a nut 70 (weld nut). Further, the other end of the connecting member 66 extends toward the bathroom floor 56 side. One side surface 72A of the support member 72, which is formed in an L-shaped cross section and extends along the extending direction of the floor beam 64, is fixed to the other end by a method such as welding. The peripheral edge of the bathroom floor 56 is placed on the other side surface 72B of the support member 72. As a result, the bathroom floor portion 56 is supported by the floor beam 64 via the connecting member 66 and the support member 72. In this state, the lower surface of the bathroom floor 56 is set to be arranged at substantially the same position as the lower flange 64C of the floor beam 64 in the building height direction, or above the lower flange 64C of the building. Has been done.

(Main part of the present invention)
As shown in FIGS. 1 and 5, in the present embodiment, the fireproof material 74 and the sound insulating sheet 76 are arranged so as to cover the stepped portion 62 of the general floor portion 30 and the bathroom floor portion 56. The fireproof material 74 is formed of rock wool contained in the fireproof material as an example, and is arranged along the height direction of the building so as to cover the step portion 62.

The upper end portion of the fireproof material 74 is sandwiched between the end surface 30A of the general floor portion 30 and the contact member 78 made of solid wood. Then, by driving the screw 80 into the contact member 78, the upper end portion of the fireproof material 74 is fixed to the end surface 30A of the general floor portion 30. On the other hand, the lower end portion of the fireproof material 74 is fixed to the upper surface of the bathroom floor portion 56 by using screws 82 together with the lower end portion of the sound insulation sheet 76 described later arranged so as to cover the lower end portion from the upper side. As a result, a continuous fireproof section including the living rooms 24 and 26 and the bathroom 12 is formed by the general floor portion 30, the bathroom floor portion 56, and the fireproof material 74 made of the fireproof material. Further, since the ALC panel forming the general floor portion 30 and the bathroom floor portion 56 and the rock wool forming the fireproof material 74 are excellent in heat insulating properties, a continuous heat insulating line is formed by the fireproof section. The fire prevention section is a section in which a certain part is separated from other parts in a fireproof manner in order to prevent the spread of fire inside the building.

Further, the side surface of the fireproof material 74 facing the bathroom 12 is covered with a sound insulating sheet 76. The sound insulation sheet 76 corresponds to the "sound insulation material" in the present invention. The sound insulation sheet 76 is formed in a sheet shape, and is composed of a non-woven sound absorbing material and a high specific gravity rubber sheet as an example. Further, one surface has an adhesive surface 76A, and the adhesive is applied to impart adhesiveness. The sound insulation sheet 76 is arranged along the building height direction so that the adhesive surface 76A is in close contact with the fireproof material 74. As a result, the sound insulation sheet 76 is integrally formed with the fireproof material 74 and is arranged so as to cover the step portion 62. A sound insulation sheet having no adhesive surface may be brought into close contact (contact) with the fireproof material 74 to cover the stepped portion.

As shown in FIG. 1, the upper end portion of the sound insulation sheet 76 is fixed to the wall surface of the inner wall material 36 of the north wall portion 16 by the adhesiveness of the adhesive surface 76A and the tape 84. As a result, the upper end portion of the sound insulation sheet 76 is fixed to the wall surfaces of the north wall portion 16 and the east wall portion 18.

On the other hand, as shown in FIG. 5, in the portion where the entrance / exit 48 of the bathroom unit 22 and the opening 50 of the east wall portion 18 are connected, the upper end portion of the fireproof material 74 and the contact member 78 are generally made of screws 86. It is fixed to the end face 30A of the floor portion 30. Further, the upper end portion of the sound insulation sheet 76 is overlapped with the contact member 78, and is fixed to the end surface 30A of the general floor portion 30 by using a screw 87 together with the fireproof material 74 and the contact member 78. Further, in this state, the upper ends of the fireproof material 74, the contact member 78, and the sound insulation sheet 76 are arranged so as to be substantially flush with the upper surface of the general floor portion 30.

Further, as shown in FIGS. 1 and 5, the lower end portion of the sound insulation sheet 76 extends so as to cover the lower end portion of the fireproof material 74, and in addition to the screw 82 described above, the adhesiveness of the adhesive surface 76A is increased. It is fixed to the bathroom floor 56 using tape 84. The sound insulation sheet 76 may be provided with a portion for directly fixing the sound insulation sheet 76 and the bathroom floor portion 56 with screws at a portion different from the portion fixed with the screw 82.

(Action / effect)
Next, the operation and effect of this embodiment will be described in comparison with the floor structure shown in FIG. In the floor structure shown in FIG. 7, a bathroom 94 and a living room 96 (dressing room) adjacent to the bathroom 94 are formed on the upper side of the general floor portion 92 of the upper floor 90A of the building 90. Further, the opening 100 formed in the partition wall 98 that separates the bathroom 94 and the living room 96 is connected to the entrance / exit (reference numeral omitted) of the bathroom unit 102. In such a floor structure, since the bathroom unit 102 and the living room 96 are provided on the upper side of the common general floor portion 92, a step portion is not generated between the bathroom 94 and the living room 96. Therefore, it is difficult for the living sound of the upper floor 90A to be transmitted through the ceiling portion 104 of the lower floor 90B. On the other hand, since the floor surface in the bathroom unit 102 is higher than the floor height of the floor surface of the living room 96, it is necessary to get over the step portion 106 when entering and exiting the living room 96 and the bathroom unit 102.

On the other hand, in the present embodiment, the bathroom 12 adjacent to the general living room (living rooms 24 and 26) is provided with the bathroom floor portion 56 having a floor height lower than that of the general floor portion 30 of the general living room, and the general floor portion 30 is provided. A step portion 62 is generated between the floor portion 56 and the bathroom floor portion 56. In the bathroom 12 having such a floor structure, the floor height in the bathroom unit 22 is lowered to reduce the height difference from the general floor portion 30 as compared with the case where the bathroom unit is installed on the bathroom floor portion having the same floor height as the general floor portion. It becomes possible to reduce. As a result, the bathroom 12 can be made barrier-free.

By the way, in the bathroom 12 of the upper floor 10A of the multi-story building 10 as in the present embodiment, the bathroom floor 56 of the bathroom 12 is close to the ceiling (not shown) of the lower floor. Further, usually, a space 58 for arranging a drain pipe 60 or the like is formed between the bathroom floor portion 56 of the bathroom 12 and the bottom wall portion 42 of the bathroom unit 22. Therefore, the sound generated in the bathroom unit 22 is likely to reverberate in the space 58, so that sound leakage to the lower floor is likely to occur through the step portion 62 between the general floor portion 30 and the bathroom floor portion 56.

Since the sound insulation sheet 76 is arranged so as to cover the step portion 62 between the general floor portion 30 and the bathroom floor portion 56, the sound insulation sheet 76 is filled between the general floor portion 30 and the bathroom floor portion 56. Thereby, the sound insulation effect of the step portion 62 can be improved.

Further, in the present embodiment, since the sound insulation sheet 76 is arranged in close contact with the fireproof material 74 arranged so as to cover the step portion 62, the fireproof material 74 also functions as a sound insulation material, so that the step portion 62 The sound insulation effect is further improved. Further, since a continuous fire prevention section can be formed by the general floor portion 30 made of the fire prevention material, the bathroom floor portion 56, and the fire prevention material 74, the fire prevention performance of the building 10 can be improved.

Further, in the present embodiment, the step portion 62 can be easily covered by bringing the adhesive surface 76A of the sound insulation sheet 76 into contact with the general floor portion 30 and the bathroom floor portion 56. Further, since the sound insulation sheet 76 can be positioned by the adhesive surface 76A, the workability is excellent.

Further, in the present embodiment, since the upper end portion of the sound insulation sheet 76 is fixed to the wall surface of the north wall portion 16 and the east wall portion 18 (the wall surface of the inner wall material 36), the north wall portion 16 and the east wall portion 18 are generally used. The boundary with the floor portion 30 can be covered with the sound insulation sheet 76. As a result, it is possible to suppress sound leakage that occurs between the general floor portion 30 and the wall in addition to the step portion 62, and it is possible to further enhance the soundproofing performance of the building by the sound insulation sheet 76. Further, by securing the fixing portion of the sound insulation sheet 76 on the wall surfaces of the north wall portion 16 and the east wall portion 18, the sound insulation sheet 76 can be easily attached.

Further, in the present embodiment, the general floor portion 30 and the bathroom floor portion 56 are supported by a common floor beam 64 constituting the skeleton of the building 10. As a result, the number of member points can be reduced as compared with a structure in which a plurality of floor portions having different floor heights are separately supported by a building frame corresponding to the floor height of each floor portion. As a result, the construction cost of the building can be reduced and the construction period can be shortened, and further, the weight of the entire building can be reduced.

[Second Embodiment]
Hereinafter, a second embodiment of the floor structure according to the present invention will be described with reference to FIG. The same components as those in the first embodiment described above will be assigned the same number and the description thereof will be omitted.

As shown in FIG. 6, this second embodiment is characterized in that the upper end portion of the sound insulation sheet 76 is sandwiched between the general floor portion 30 and the east wall portion 18. Specifically, the upper end portion of the sound insulation sheet 76 is arranged on the upper side of the general floor portion 30 via the floor base material (reference numeral omitted), and the east wall portion 18 sandwiches the upper end portion from the upper side of the building. It is fixed to the general floor portion 30. As a result, the upper end of the sound insulation sheet 76 is fixed to the upper surface of the floor base material by using the adhesiveness of the adhesive surface 76A and the tape 84. Further, by being fixed to the general floor portion 30 together with the east wall portion 18, the airtightness between the sound insulation sheet 76 and the general floor portion 30 is enhanced.

(Action / effect)
Since the floor structure having the above structure basically follows the structure of the floor structure according to the first embodiment, the same action and effect can be obtained.

Further, in the present embodiment, since the upper end portion of the sound insulation sheet 76 is fixed to the general floor portion 30 together with the north wall portion 16 and the east wall portion 18, a gap is less likely to occur between the sound insulation sheet 76 and the general floor portion 30. .. As a result, the sound insulation effect of the step portion 62 can be further improved.

[Supplemental Information]
In each of the above embodiments, the floor structure according to the present invention is applied to a stepped portion of the floor height generated between the bathroom 12 and the general living room (living rooms 24 and 26), but the present invention is not limited to this. For example, it may be applied to a step portion of the floor height generated between the dirt floor of the entrance and a general living room or a corridor. That is, the step portion formed between the general floor portion constituting the floor portion of the general living room and the soil floor portion forming the soil floor having a floor height lower than that of the general floor portion may be covered with a sound insulating material.

Further, in each of the above embodiments, the sound insulating sheet 76 is arranged on the bathroom 12 side of the fireproof material 74, but the present invention is not limited to this, and the fireproof material 74 may not be provided.

Further, in each of the above embodiments, the general floor portion 30 and the bathroom floor portion 56 are formed of a fireproof material, but the present invention is not limited to this and may be formed of a material not included in the fireproof material. ..

Further, in each of the above embodiments, the sound insulating material is composed of a sound insulating sheet 76 formed of a resin material, but the present invention is not limited to this. It may be plate-shaped or block-shaped. Further, the material is not limited to resin, and may be made of rock wool or glass wool.

Further, in each of the above embodiments, the edges of the upper end and the lower end of the sound insulation sheet 76 are fixed by the tape 84, but in the configuration where the sound insulation sheet 76 includes the adhesive surface 76A, the tape 84 is omitted. May be good. Further, the lower end portion of the sound insulation sheet 76 may not be fixed by using the screw 82 together with the lower end portion of the fireproof material 74. With the above configuration, it is not necessary to secure the glue margin width of the seal, so that it is possible to suppress an increase in the size of the sound insulation sheet.

Further, in each of the above embodiments, the inner wall material 36 is arranged on the side surfaces of the north wall portion 16 and the east wall portion 18 facing the bathroom, but the present invention is not limited to this, and the side surface facing the bathroom is not limited to this. The inner wall material 36 may not be arranged, and the upper end portion of the sound insulation sheet 76 may be fixed to the upper end portion of the runner 32 or the stud 34. Further, in this case, the inner wall material 36 may be fixed from the outside of the sound insulation sheet 76 so that the upper end portion of the sound insulation sheet 76 is sandwiched between the runner 32 and the inner wall material 36.

10 Building 12 Bathroom 16 North wall (building wall)
18 East wall (building wall)
22 Bathroom unit 24 Living room (general living room)
26 Living room (general living room)
30 General floor (upper floor)
42 Bottom wall 56 Bathroom floor (lower floor)
62 Steps 74 Fireproof material 76 Sound insulation sheet (sound insulation material)

Claims (6)

Upper floor and
A lower floor portion adjacent to the upper floor portion and having a lower floor height than the upper floor portion,
A sound insulation material that is arranged along the vertical direction of the building and covers the stepped portion generated between the upper floor portion and the lower floor portion.
Floor structure with. The upper floor and the lower floor are made of a fireproof material.
Between the sound insulating material and the upper floor portion and the lower floor portion, a fireproof material covering the step portion generated between the upper floor portion and the lower floor portion is arranged along the vertical direction of the building.
The sound insulating material is in close contact with the fireproof material at the step portion.
The floor structure according to claim 1. The sound insulation material is formed in the form of a sheet, and is composed of a sound insulation sheet having adhesive surfaces on the upper floor portion and the surface in contact with the lower floor portion.
The floor structure according to claim 1 or 2. The upper end portion of the sound insulating material is supported by the upper floor portion and fixed to the wall surface portion of the wall of the building erected on the upper side of the building.
The floor structure according to any one of claims 1 to 3. The upper end portion of the sound insulating material is fixed by being sandwiched between the upper floor portion and the wall of the building supported by the upper floor portion and erected on the upper side of the building.
The floor structure according to any one of claims 1 to 3. The upper floor is regarded as a general floor of a general living room of a building.
The lower floor is a bathroom floor of a bathroom adjacent to the general living room.
On the upper side of the building on the floor of the bathroom, the bottom wall of the bathroom unit installed inside the bathroom is arranged at a predetermined interval.
The floor structure according to any one of claims 1 to 5.