CN101238258B - Floor-ceiling structure - Google Patents

Abstract

A floor-ceiling structure between an upper floor and a lower ceiling, comprising a plurality of floor joists arranged in a specified direction in a state substantially parallel to each other, The side joists arranged at positions sandwiching the floor joists from the specified direction, and the side joists and the floor joists arranged at positions sandwiching the floor joists from a direction perpendicular to the specified direction. The end joists to which the ends of the joists are fixed, and the ceiling beams for suspending the ceiling are ceiling beams arranged substantially parallel to the side joists across the end joists. At least one joist in a joist group consisting of the side joists and the plurality of floor joists is supported by the wall of the upper or lower floor, and the ceiling beam is provided only in the vicinity of the wall.

Description

floor-ceiling structure

technical field

The present invention relates to floor-ceiling structures supported by multiple walls, and in particular to floor-ceiling structures having good soundproofing properties. the

Background technique

In recent years, in residential buildings, floor structures (steel houses) in which floors are joined to frames formed of metal frame members and beams have been adopted instead of floor structures in which floors are joined to wooden frames. Since this steel house uses a skeleton formed of frame materials and beam materials made of metal profiles, vibration resistance and durability can be improved. the

In addition, in the case of using such a floor structure having a skeleton formed of metal frame materials and beam materials as the boundary floor (separation floor) of the boundary between the upper and lower floors of a shared house (hereinafter referred to as the floor-ceiling structure ), although the floor structure of the skeleton of wood is improved compared with the conventional wood, but due to the improvement of consumers' demands, soundproofing measures are required. In particular, it is necessary to take countermeasures against the impact noise generated downstairs when people jump or walk (hereinafter referred to as heavy floor impact noise). the

There are (1) a method of increasing the weight of the floor structure and (2) a method of increasing the bending rigidity of the floor structure as general methods of reducing the impact noise of the weight floor. In addition, as a method of quickly attenuating the vibration of the floor after the impact force acts and suppressing discomfort, there is (3) a method of imparting vibration-damping properties to the floor, and the like. Furthermore, these (1), (2), and (3) methods can also be used together. the

In Patent Document 1, a ceiling structure and a building are disclosed, which provide a ceiling structure and a building in which the number of components is not increased, and the piping in the space in the floor is not affected, and the weight of the upper floor is distributed by the ceiling. The floor impact sound vibration mode reduces the weight of the vibration to the downstairs floor impact sound. the

In the ceiling structure and building described in Patent Document 1, through the hammer parts installed on the ceiling ribs of the ceiling panel, the ceiling panel is used to disperse the vibration of the weight floor impact sound vibration mode upstairs, and the vibration to the downstairs is reduced. Heavy floor impact sound, since the hammer part is installed on the ceiling rib of the ceiling panel, there is no increase in the number of parts used to install the hammer part, and since the space inside the floor part is not closed at all, there is no effect on the sound inside the floor part The effect of piping. Furthermore, since the peripheral portion of the ceiling panel to which the hammer member is mounted is attached to the floor joist via the anti-vibration rubber, the vibration dispersion of the ceiling panel becomes more effective, and the effect of reducing the weight floor impact noise generated by the hammer member can be obtained. further enhanced effect. the

In addition, in Patent Document 2, a soundproof ceiling structure is disclosed, which can suppress the transmission of vibration from upstairs to downstairs and reduce floor impact noise during light impact and weight impact. Sound insulation in the area. the

In the sound-proof ceiling structure described in Patent Document 2, when vibration is transmitted from the ceiling base material to the ceiling member via the suspension member, the vibration-damping effect of the vibration-proof member can greatly reduce the vibration caused by solid transmission. The resulting vibration level of the ceiling components. the

Furthermore, Patent Document 3 discloses a ceiling suspension capable of absorbing vibrations in relatively large frequency bands. the

The ceiling suspension described in Patent Document 3 includes an upper mounting member mounted on a beam on the back of the ceiling, and a lower side extending downward from one side of the upper mounting member and supporting the ceiling base through a lower end portion. The mounting member is provided with a damper member on the connecting portion of the above-mentioned upper mounting member and the above-mentioned lower mounting member. Since the above-mentioned damper member is provided with a plurality of anti-vibration rubbers having different vibration absorption frequency bands, it is possible to obtain a large vibration absorption capacity. The effect of the vibration of the frequency band. the

However, in any of the structures of Patent Document 1 to Patent Document 3, it is necessary to add a weight member, to seal a fluid inside the elastic body, or to stack and arrange vibration-proof rubbers having different hardness. Therefore, even if there is a small number of parts or an increase in cost, the number of parts and the cost will increase sharply as the structure becomes larger. the

[Patent Document 1] JP-A-2002-121856 Gazette

[Patent Document 2] Japanese Patent Application Laid-Open No. 10-183849

[Patent Document 3] JP-A-2003-313987 Gazette

Contents of the invention

It is an object of the present invention to provide a floor-ceiling structure that can significantly reduce floor impact noise in a relatively large frequency band and does not require an increase in components or a complicated design. the

In order to achieve the above objects, the present invention is a floor-ceiling structure placed between an upper floor and a lower ceiling, comprising: a plurality of floor joists arranged substantially parallel to each other along Arranged in a specific direction; side joists (side joists), in the state of being arranged approximately parallel to these floor joists, are arranged at positions sandwiching the floor joists from the above-mentioned specific direction; end joists (header joists), Arranged at positions sandwiching the floor joists from a direction perpendicular to the above-mentioned specific direction, and fixing the ends of the side joists and the floor joists to form a frame with the side joists; and ceiling beams (ceiling beam) for suspending the ceiling, straddling the end joists and disposed approximately parallel to the side joists; wherein at least one joist in the set of joists consisting of the side joists and the plurality of floor joists is covered by the above The walls of the upper or lower floors are supported, and the beams for the ceiling are provided only in the vicinity of the walls. the

Description of drawings

FIG. 1 is a perspective view showing an example of a floor-ceiling structure according to a first embodiment. the

FIG. 2 is a top view of the floor-ceiling structure of FIG. 1 . the

Fig. 3 is a schematic perspective view showing details of a ceiling beam. the

Fig. 4(a) is a cross-sectional view showing the structure of the floor-ceiling structure, and Fig. 4(b) is a diagram for explaining the operation when a force is applied to the floor. the

5( a ) is a schematic sectional view of the floor, and FIGS. 5( b ) to 5 ( e ) are schematic diagrams showing first-order to fourth-order modes of the floor, respectively. the

6( a ) is a schematic cross-sectional view of the floor, and FIGS. 6( b ) to 6( e ) are schematic diagrams showing first-order to fourth-order modes of the floor, respectively. the

7( a1 ), FIG. 7( a2 ), FIG. 7( b1 ), and FIG. 7( b2 ) are schematic diagrams showing arrangement examples of walls. the

8( a1 ), FIG. 8( a2 ), FIG. 8( b1 ), and FIG. 8( b2 ) are schematic diagrams showing examples of arrangement of walls. the

9(a) to 9(d) are plan views showing another example of the floor-ceiling structure. the

10 is a graph showing the vibration transmissibility of Examples 1 to 3 and Comparative Example 1. FIG. the

Fig. 11 is a graph showing the measurement results of a weight floor impact sound experiment. the

Fig. 12 is a diagram showing experimental measurement results of light floor impact noise. the

13( a ) to 13( c ) are diagrams showing Examples 1 to 3, respectively, and FIG. 13( d ) is a diagram showing Comparative Example 1. FIG. the

(Symbol Description)

11 end joists

30 Ceiling Beams

31 Suspension parts

32 Ceiling reinforcement beam

33 Ceiling bars

50 floor

Detailed ways

Embodiments of the present invention will be described below. the

(first embodiment)

FIG. 1 is a perspective view showing an example of a floor-ceiling structure 100 according to the first embodiment, and FIG. 2 is a plan view of the floor-ceiling structure 100 in FIG. 1 . the

The floor-ceiling structure 100 of Fig. 1 and Fig. 2 is the structure between the upper floor 50 and the lower floor ceiling 60 (not shown), mainly including end joists 11, side joists 12, floor joists 20, and ceiling joists. Beam 30, hanger member 31 (hanger member, not shown), ceiling reinforcement beam 32 (furring bracket, not shown), ceiling reinforcement 33 (furring, not shown). In addition, the ceiling beam 30 , the suspension member 31 , the ceiling tie bolster 32 , and the ceiling tie 33 constitute a ceiling support portion for suspending the ceiling 60 from the end joist 11 . the

As shown in FIGS. 1 and 2 , in the floor-ceiling structure 100 , a pair of end joists 11 arranged approximately parallel to each other and a pair of side joists 12 arranged approximately perpendicular to the end joists 11 The ends of each are connected to form a rectangular frame. In the frame, a plurality of floor joists 20 are arranged approximately parallel to the side joists 12 , and both end portions of these floor joists 20 are respectively fixed to the pair of end joists 11 . In other words, the pair of side joists 12 are arranged to sandwich the floor joists 20 from the direction in which the floor joists 20 are arranged, and the pair of end joists 11 are arranged to sandwich the floor in a direction perpendicular to the direction in which the floor joists 20 are arranged. Joist 20 position. The floor 50 is fixedly supported by a pair of end joists 11 and side joists 12 , and a plurality of floor joists 20 . the

In addition, as shown in FIG. 2, in the above-mentioned frame, a plurality of beams 30 for ceilings are arranged approximately parallel to the pair of side joists 12 and the plurality of floor joists 20, and the two ends of these ceiling beams 30 are fixed respectively. On a pair of end joists 11. Details of the number and arrangement of the ceiling beams 30 will be described later. the

FIG. 3 is a schematic perspective view showing details of the ceiling beam 30 . As shown in FIG. 3 , the upper surfaces of the pair of end joists 11 , the upper surfaces of the pair of side joists 12 , and the upper surfaces of the plurality of floor joists 20 are substantially at the same height, and can support the floor 50 . The end joists 11 have a substantially U-shaped cross-sectional shape that opens inwardly, and both end portions of the side joists 12 and the floor joists 20 enter into the openings of the end joists 11. In addition, the cross-sectional shape of the end joist 11 is not limited to a substantially U-shape, and may be other shapes such as an I-shape, for example. The ceiling beam 30 has a substantially U-shaped cross section. In addition, the cross-sectional shape of the ceiling beam 30 is not limited to a substantially U-shaped shape, and may be any shape such as a square shape or a Z-shape. the

On the ceiling beam 30 , as shown in FIG. The material of the suspension member 31 is made of wood or metal, and especially when it is made of metal, it is also called a suspension metal object or a suspension metal fitting. A ceiling stud 33 for fixing the ceiling 60 is attached to a lower portion of the suspension member 31 via a ceiling stud bolster 32 . The stud bolster 32 is a rod-shaped member extending in a direction substantially perpendicular to the ceiling stud 33 . The ceiling stud bolster 32 may be attached above the lower end of the hanging member 31 , or may be attached to the lower end of the hanging member 31 in a state protruding below the hanging member 31 . the

The ceiling beam 30 is provided so as not to protrude from the upper surfaces of the pair of end joists 11 . Moreover, the suspension member 31 is also provided so that it may not protrude from the upper surface of a pair of end joist 11, but may protrude from the lower surface. That is, the ceiling beam 30 is provided so as not to be in contact with the floor 50 , and the ceiling 60 is attached to the ceiling beam 30 via the suspension member 31 , the ceiling tie bolster 32 , and the ceiling tie 33 . the

Next, the principle of vibration transmission of the floor-ceiling structure 100 will be described. FIG. 4( a ) and FIG. 4( b ) are diagrams for explaining vibration transmission from the floor 50 . 4( a ) is a cross-sectional view showing the structure of the floor-ceiling structure 100 , and FIG. 4( b ) is a diagram for explaining the operation when a force F is applied to the floor 50 . the

First, as shown in FIG. 4( b ), a force F is applied to the floor 50 . The resulting vibration is transmitted to the end joists 11, the side joists 12, and the floor joists 20 as solid propagating components. The vibrations transmitted to the end joists 11 are transmitted to the ceiling beams 30 , and the vibrations transmitted to the side joists 12 and the plurality of floor joists 20 are transmitted to the ceiling beams 30 via the end joists 11 . The vibration transmitted to the ceiling beam 30 is transmitted to the ceiling 60 via the suspension member 31 , the ceiling tie bolster 32 , and the ceiling tie 33 . the

Furthermore, in the case where the force F is applied to the floor 50, at the same time the vibration of the floor 50 is transmitted to the ceiling 60 as an airborne component (sound) via the air within the floor-ceiling structure. In such structures, the solid-borne component is dominant compared to the air-borne component. the

Next, in the structure of the floor 50, the frame, and the floor joists 20 (hereinafter, the floor 50, the floor joists 20, and the frame (end joists 11 and side joists 12) are collectively referred to as the floor 200) in this embodiment, The general form of vibration will be described. In addition, in this embodiment, since the generation|occurrence|production of the vibration mode in the longitudinal direction of the end joist 11 of the floor 200 is comparatively remarkable, only the vibration mode of one direction is demonstrated. the

FIGS. 5( a ) to 5 ( e ) are schematic diagrams for explaining vibration of a floor formed by arranging two floor panels 200 a and 200 b in the longitudinal direction of the end joist 11 . Figure 5(a) is a schematic cross-sectional view of the floor, Figure 5(b) shows the first-order model of the floor, Figure 5(c) shows the second-order model of the floor, Figure 5(d) shows the third-order model of the floor, Figure 5( e) Represents the fourth-order mode of the floor. In addition, the upper part of the space partitioned by the floor 200a and the floor 200b is an upper floor, and the lower part is a lower floor. the

As shown in FIG. 5( a ), the two floor panels 200a and 200b are arranged in a state where the side joists 12 are in contact with each other. In addition, the floor boards 200a and 200b may be arranged so as to form a predetermined gap between the mutual side joists 12, or may be integrally configured so that the mutual side joists 12 are commonly used. the

Walls 70 are provided up and down on one end side (left side in FIG. 5( a )) of the floor 200a, and walls 70 are provided on the upper surface of the center of the floor 200a. Specifically, the vertically arranged walls 70 are connected to the side joists 12 on one end side of the floor 200a, and the second wall 70 from the left of the upper stage is connected to the floor joists 20 in the center. In other words, the side joists 12 at one end are supported by the lower and upper walls 70 , and the floor joists 20 at the center are supported by the upper walls 70 . the

Moreover, the wall 70 is provided up and down at the end part of the other end side (right side in FIG.5(a)) of the floor 200b, and the wall 70 is provided in the lower surface of the center part of the floor 200b. Specifically, the vertically arranged walls 70 are connected to the side joists 12 on the other end side of the floor 200a, and the second wall 70 from the right of the lower floor is connected to the floor joists 20 in the center. In other words, the side joists 12 on the other end side are supported by the walls 70 of the lower and upper floors, and the floor joists 20 in the center are supported by the walls 70 of the lower floor. the

Hereinafter, for description, the distance from the wall 70 provided only on the upper stage of the floor 200a to the wall 70 provided only on the lower stage of the floor 200b is represented as a distance L. As shown in FIG. the

When focusing on the floor 200a and the floor 200b shown in FIG.5(a), the position corresponding to the joist supported by the wall 70 in a frame becomes a vibration node. Therefore, when the force F applied to the floor 50 includes a frequency component that matches the first-order natural frequency, as shown in FIG. 5(b), the floor 200a and the floor 200b vibrate in the first-order mode. That is, the amplitude of the portion at a distance of L/2 from the wall 70 existing only in the upper layer is the largest (antinode), and the amplitude of the portion close to the wall 70 is the smallest (node). the

In addition, when the force F applied to the floor 50 includes a frequency component that matches the second-order natural frequency, as shown in FIG. 5( c ), the floor 200 a and the floor 200 b vibrate in the second-order mode. In this case, the amplitude of the portion at distances L/4 and 3L/4 from the wall 70 existing only in the upper layer is the largest, and the amplitude of the portion of L/2 and the portion close to the wall 70 is the smallest. the

Furthermore, when the force F applied to the floor 50 includes a frequency component that matches the third-order natural frequency, as shown in FIG. 5( d ), the floor 200 a and the floor 200 b vibrate in the third-order mode. In this case, the vibration amplitude is the smallest at the portions at distances of L/3 and 2L/3 from the wall 70 existing only in the upper layer, and at the portion close to the wall 70 . the

Furthermore, when the force F applied to the floor 50 includes a frequency component that matches the fourth-order natural frequency, as shown in FIG. 5( e ), the floor 200 a and the floor 200 b vibrate in the fourth-order mode. In this case, the amplitude of vibration is minimum at portions at distances of L/4, L/2, and 3L/4 from the wall 70 existing only in the upper layer, and at portions close to the wall 70 . the

Therefore, considering the vibration mode of the longitudinal direction of the end joists 11 of the floors 200a, 200b, it is preferable to install the beams 30 for the ceiling on portions of the floors 200a, 200b that vibrate less. the

Next, another example of the general vibration form described in FIG. 5 will be described. FIGS. 6( a ) to 6 ( e ) are schematic diagrams for explaining vibration of a floor formed by arranging two floor panels 200 a and 200 b in the longitudinal direction of the end joist 11 . the

Fig. 6 (a) is a schematic sectional view of the floor, Fig. 6 (b) shows the first-order mode of the length direction of the end joist 11 of the floor, and Fig. 6 (c) shows the second-order mode of the length direction of the end joist 11 of the floor , FIG. 6( d ) shows a third-order mode in the longitudinal direction of the end joist 11 of the floor, and FIG. 6( e ) shows a fourth-order mode in the longitudinal direction of the end joist 11 of the floor. the

As shown in FIG. 6 , walls 70 are provided above and below the end portion on the one end side of the floor panel 200 a and the end portion on the other end side of the floor panel 200 b. Furthermore, a wall 70 is provided on the upper side of the floor 200b. That is, as described with reference to FIG. 5( a ), the side joists 12 on one end side of the floor 200 a and the side joists 12 on the other end side of the floor 200 b are supported by the walls 70 of the lower and upper floors, and the one end side of the floor 200 b Adjacent floor joists 20 are supported by walls 70 of the upper floor. the

Hereinafter, the distance from the left wall 70 in the figure to the upper wall 70 is L11, and the distance from the central wall 70 in the figure to the right wall 70 in the figure is L12. the

Parts of the floor 200a and the floor 200b within the range of the distance L11 vibrate in the first-order mode, the second-order mode, the third-order mode, and the fourth-order mode on the floor 200a and the floor 200b respectively in response to the applied force. However, in any of the first-order mode to the fourth-order mode, the amplitude of the floor 200a is small in the range where the distance from the wall 70 is 1/8 or less of L11. That is, it shows that the ceiling beam 30 is provided only on the left side of the wall 70 provided only on the upper stage, and only in the part close to the wall 70, so that the vibration transmission rate becomes the lowest. the

Moreover, similarly, a part of the floor 200b within the range of the distance L12 vibrates in the first-order mode, the second-order mode, the third-order mode, and the fourth-order mode in response to the applied force, respectively. However, in any of the first-order mode to the fourth-order mode, the amplitude of the floor 200b is small in the range where the distance from the wall 70 is 1/8 or less of L12. That is, it shows that the ceiling beam 30 is provided only on the right side of the wall 70 provided only on the upper floor, and only in the part close to the wall 70, so that the vibration transmission rate becomes the lowest. the

Based on the above, by installing the beam 30 for the ceiling on the left side of the wall 70 provided only on the upper floor within the range of 1/8 of L11 or less from the wall 70, and installing the beam 30 on the right side of the wall 70 provided only on the upper floor at a distance of 1/8 or less from the wall 70, The wall 70 is within the range of 1/8 or less of L12, and it is possible to reduce the vibration generated in the floors 200a and 200b from being transmitted to the ceiling 60 through solid propagating components. the

In particular, when the beam 30 for the ceiling is installed within a range of 1/4 or less of the distances L11 and L12 from the wall 70, since the antinodes of the first-order mode and the second-order mode are not included, it is possible to reduce the The vibration of the ceiling in the first-order mode and the second-order mode does not include the first-order mode and the second-order mode when the beam 30 for the ceiling is installed within a range of 1/6 or less of the distances L11 and L12 from the wall 70 . and the antinode of the third-order mode, so the vibration of the ceiling caused by the first-order mode, the second-order mode, and the third-order mode can be reduced, and the beam 30 for the ceiling is installed at 1/8 of the distance L11 and L12 from the wall 70. In the case of the range, since the antinodes of the first-order to fourth-order modes are not included, the vibration of the ceiling due to the first-order to fourth-order modes can be reduced. the

Next, a specific example of the arrangement of the wall 70 will be described. FIGS. 7( a1 ) to 7 ( b2 ) and FIGS. 8 ( a1 ) to 8 ( b2 ) are schematic diagrams showing an arrangement example of the wall 70 . the

Fig. 7 (a1) and Fig. 7 (a2) set wall 70 below floor 200a, Fig. 7 (b1) and Fig. 7 (b2) set wall 70 above the contact part of floor 200a and floor 200b, Fig. 8 (a1 ) and Fig. 8 (a2) set wall 70 above and below the contact part of floor 200a and floor 200b, Fig. 8 (b1) and Fig. 8 (b2) set wall 70 below the contact part of floor 200a and floor 200b. the

As shown in FIG. 7( a1 ), when the wall 70 is provided below the floor 200 a , it is preferable to arrange the ceiling beam 30 near the wall 70 as shown in FIG. 7( a2 ). That is, the vibration transmitted to the ceiling 60 can be suppressed to a minimum by disposing the ceiling beam 30 near the vibration node of the floor 200a. the

In particular, considering the vibration from the first-order mode to the fourth-order mode, the position of the arrangement of the beam 30 for the ceiling is preferably within a range of 1/4 or less of the distance from the wall 70 of L1a (L1a'), more preferably within a range of The distance from the wall 70 is within the range of 1/6 or less of L1a (L1a'), more preferably within the range of 1/8 or less of the distance from the wall 70, the closer the distance to the wall 70 is 0 is more preferred. the

As a result, since the beam 30 for the ceiling is arranged on the portion of the floor 200 where the vibration amplitude is the smallest, it is possible to suppress the vibration of the floor from being transmitted to the ceiling 60 . the

Similarly, as shown in Fig. 7(b1) and Fig. 8(a1), in the case where a wall 70 is provided above the floor 200a, as shown in Fig. 7(b2) and Fig. 8(a2), especially if considering For the vibration of the first-order mode to the fourth-order mode, the position of the arrangement of the ceiling beam 30 is preferably 1/4 of the distance from the wall 70 to L1b (L1b') and L2a (L2a'), and the closer the distance to the wall 70 is to 0 more preferred. the

As a result, since the ceiling beam 30 is arranged on the portion of the floor 200 where the vibration amplitude is the smallest, transmission of the vibration of the floor 200 to the ceiling 60 can be suppressed. the

In addition, as shown in FIG. 8(b1), in the case where a wall 70 is provided below the floors 200a, 200b, as shown in FIG. 8(b2), in particular, if the vibration from the first-order mode to the fourth-order mode is considered, Therefore, the position where the beam 30 for ceiling is arranged is preferably 1/4 of the distance from the wall 70 of L2b (L2b'), and the closer to 0 the distance from the wall 70 is, the more preferable. the

As a result, since the ceiling beam 30 is arranged on the portion of the floor 200 where the vibration amplitude is the smallest, transmission of the vibration of the floor 200 to the ceiling 60 can be suppressed. the

Next, another example of the floor-ceiling structure 100 shown in FIG. 2 will be described. 9( a ) to 9 ( d ) are plan views showing another example of the floor-ceiling structure 100 . the

Figure 9(a) shows a floor-ceiling structure 100a, one end joist 11 is divided into two end joists 11a, 11b, the end joists 11a, 11b are connected via auxiliary side joists 12a, and one side joist 12 and the end joist 11b are connected via the auxiliary side joist 12b, and a plurality of anti-rolling parts 35 are provided at appropriate positions. FIG. 9(b) shows a floor-ceiling structure 100b, and one end joist 11 is divided into two Two end joists 11a, 11b, the end joists 11a, 11b are connected via auxiliary side joists 12a, Fig. 9(c) shows a floor-ceiling structure 100c, one end joist 11 is divided into three end joists 11d ~ 11f, end joists 11e and end joists 11d, 11f are connected via auxiliary side joists 12c, 12d, and a plurality of anti-rolling parts 35 are provided at appropriate positions. Fig. 9(d) shows a floor-ceiling structure 100d One end joist 11 is divided into three end joists 11d to 11f, and the end joist 11e and the end joists 11d and 11f are connected via auxiliary side joists 12c and 12d. In addition, in these floor-ceiling structures 100a-100d, the side joists 12 may be extended without the auxiliary side joists 12b, or the floor joists may be supported without the auxiliary side joists 12a, 12c, 12d. The beam 20 is extended. the

As shown in FIGS. 9( a ) to 9 ( d ), floor-ceiling structures 100 a to 100 d are not limited to rectangular shapes as shown in FIG. 2 , and may have other arbitrary shapes. Also in these cases, the vibration transmitted from the floor to the ceiling can be reduced by providing the ceiling beam 30 only in the vicinity of the wall 70 . In addition, the plurality of anti-rolling portions 35 have the same function as that of the end joist 11 in this embodiment. the

Moreover, when at least five floor joists 20 are arrange|positioned between the walls 70, it is preferable that the beam 30 for ceilings is provided in the range from each wall 70 to the 2nd floor joist 20. In this way, since the ceiling beam 30 is provided at a position close to the wall 70, the large vibration amplitude of the floor 50 is not transmitted to the ceiling 60, and vibration can be reduced. the

In addition, in this embodiment, the case where the wall exists in the range of the full length of the side joist 12 and the floor joist 20 was demonstrated, but it is not limited to this The same effect can be obtained with the windows or doors of objects. In addition, it is not limited to a wall, and may be supported by other arbitrary separate members, for example, columns. the

As described above, in the floor-ceiling structure of the present invention, when a force acts on the floor 200 to generate vibration, the vibration is transmitted to the frame body having the end joists 11 and the side joists 12 . Since one or more joists in the joist group consisting of a pair of side joists 12 and a plurality of floor joists 20 are supported by the wall 70 , the vibration of the frame corresponding to the position of the joist supported by the wall 70 becomes smaller, and the vibration of the part away from this position becomes larger. Therefore, since the vibration of the ceiling beam 30 can be reduced by providing the ceiling beam 30 only in the vicinity of the wall 70 , the vibration transmitted from the floor 50 to the ceiling 60 can be reduced. the

As a result, it is possible to reduce shock noise in a relatively large frequency band with a simple structure. In particular, since the contribution of the solid propagating component of the heavy floor impact sound is large, the vibration of the ceiling beam 30 can be reduced to reduce the heavy floor impact sound. the

<Example A>

(Example 1-3)

As Examples 1 to 3, for the case where the ceiling beam 30 is installed at a distance of L/4 from the wall 70 (see FIG. 13( a )), the ceiling beam 30 is installed at a distance from the wall 70 In the case of being within the range of L/6 (see FIG. 13(b)), the case where the ceiling beam 30 is installed at a distance of L/8 from the wall 70 (see FIG. 13(c)) from the floor The vibration transfer rate to the ceiling was simulated. the

In addition, as the conditions of the simulation, the vibration of the ceiling when vibration was applied to one point of the upper surface of the floor was calculated by the finite element method. The applied vibration point selects the applied vibration point that produces the largest weight floor impact sound when the weight floor impact sound is tested in a conventional structure based on JIS A1418. In addition, the sum of the vibration velocities at a plurality of points arranged approximately equally is used as a representative value for the ceiling vibration. the

(Comparative example 1)

As Comparative Example 1, the vibration transmission rate from the floor to the ceiling was simulated in a conventional structure (see FIG. 13( d )) in which ceiling beams 30 are provided on the entire floor-ceiling structure. the

10 is a graph showing the vibration transmission rate from the floor to the ceiling of Examples 1 to 3 and Comparative Example 1. FIG. the

In FIG. 10 , the vertical axis represents vibration transmissibility (dB), and the horizontal axis represents frequency (Hz). Here, the vibration transmissibility (dB) represents the value obtained by dividing the representative value of the ceiling vibration velocity by the vibration velocity of the floor-applied vibration point in logarithm. the

<evaluation> 

As shown in FIG. 10 , in the frequency band (50 Hz frequency band (44.7 Hz to 56.2 Hz)) that generally determines the L level of heavy floor impact noise, it can be confirmed that the vibration transmissibility is the same as that of Comparative Example 1, Example 1, Example 2, and The order of Example 3 is lowered. From this, it can be confirmed that the reduction of the ceiling vibration becomes larger in the order of L/4, L/6, and L/8 distances from the wall 70 . the

<Example B>

Next, under the same conditions as in Example 3 and Comparative Example 1 above, heavy floor impact noise and light floor impact noise were measured based on JIS A1418. the

11 and 12 are graphs showing measurement results of heavy floor impact noise and light floor impact noise. the

The vertical axis of Fig. 11 represents the level of heavy floor impact noise (5dB/grid), the vertical axis of Fig. 12 represents the level of light floor impact sound (5dB/grid), and the horizontal axis of Fig. 11 and Fig. 12 represents the center of the 1/1 octave band frequency (Hz). the

As shown in FIG. 11 , in Example 3, compared with Comparative Example 1, a decrease of about 5 dB was confirmed in the weight floor impact sound level in the frequency range from 63 Hz to 1 kHz. In addition, a reduction of 10 dB can be realized in the 2 kHz band and the 4 kHz band. the

On the other hand, as shown in FIG. 12 , compared with Comparative Example 1, Example 3 can realize a reduction of 3 dB in the light floor impact noise level in the frequency bands of 63 Hz and 125 Hz. In addition, a 2 dB reduction was confirmed in the range from 250 Hz to 4 kHz. the

In the floor-ceiling structure of the present invention, the floor 50 corresponds to the floor, the floor joists 20 correspond to the floor joists, the side joists 12 correspond to the side joists, the end joists 11 correspond to the end joists, and the ceiling beams 30 correspond to For ceiling beams, the ceiling 60 corresponds to the ceiling, the floor-ceiling structure 100 corresponds to the floor-ceiling structure, the wall 70 corresponds to the wall, the suspension part 31 corresponds to the suspension part, the ceiling rib 33 corresponds to the ceiling rib, and the ceiling rib bolster 32 Corresponds to the ceiling stud bolster. the

In addition, in the above-mentioned embodiment, the ceiling beam 30 is provided only near the wall 70, but for example, at least Even if one is not provided in an area other than the vicinity of the wall 70, the vibration transmitted from the floor 50 to the ceiling 60 can be reduced. the

For example, even if the ceiling beam 30 is installed in an area other than the vicinity of the wall 70 , the suspension member 31 may not be installed in an area other than the vicinity of the wall 70 . Alternatively, even if the ceiling beam 30 and the suspension member 31 are provided in areas other than the vicinity of the wall 70 , it is not necessary to provide the ceiling rib bolster 32 or the ceiling rib 33 in an area other than the vicinity of the wall 70 . the

In addition, if at least one of the ceiling beam 30, the suspension member 31, the ceiling rib bolster 32, and the ceiling rib 33 is not connected to other members in the area other than the vicinity of the wall 70, the one member can be positioned relative to the other members. Displacing independently in the separated state can also reduce the vibration transmitted from the floor 50 to the ceiling 60 . That is, all of the ceiling beam 30 , the suspension member 31 , the ceiling rib bolster 32 , and the ceiling rib 33 may be connected only in the area near the wall 70 . the

In addition, in the above-described embodiment and each modified example, the ceiling grommet bolster 32 can be omitted, and the ceiling grommet 33 can also be directly attached to the suspension member 31 . the

As described above, the floor-ceiling structure of the first technical aspect is a floor-ceiling structure between an upper floor and a lower ceiling, and includes a plurality of floor joists arranged approximately parallel to each other along a specific The side joists are arranged in a state substantially parallel to these floor joists, and are arranged at positions sandwiching the floor joists from the above-mentioned specific direction; the end joists are arranged at positions perpendicular to the above-mentioned specific direction. and fixing the side joists and the ends of the floor joists; and ceiling beams for suspending the ceiling, straddling the end joists and substantially parallel to the side joists Ground configuration; wherein at least one joist in the joist group consisting of the side joists and the plurality of floor joists is supported by the wall of the upper or lower floor, and the ceiling beams are provided only near the walls. the

In the floor-ceiling structure of the first aspect, the floor joists and the side joists are installed on the end joists in a frame composed of the side joists and the end joists substantially in parallel. In addition, in the frame composed of the side joists and the end joists, the beams for the ceiling are installed on the end joists substantially parallel to the side joists. At least one joist in a joist group consisting of a side joist and a plurality of floor joists is supported by a wall, and ceiling beams are provided only in the vicinity of the wall. the

Here, when a force acts on the floor to generate vibration, the vibration is transmitted to the frame composed of side joists and end joists. Since at least one joist in the joist group is supported by the wall, the vibration of the position of the frame body corresponding to the joist supported by the wall becomes small, and the vibration of a portion away from the position becomes large. Therefore, since the vibration of the ceiling beam can be reduced by providing the ceiling beam only in the vicinity of the wall, the vibration transmitted from the floor to the ceiling can be reduced. the

As a result, shock noise in a relatively large frequency band can be reduced with a simple structure. In particular, since the weight floor impact sound contributes more to the solid propagating component than the air propagating component in such a structure, a large reduction effect can be obtained by reducing the vibration of the ceiling beam. the

Preferably, the set of joists comprising the side joists and the plurality of floor joists includes joists supported by the first wall of the upper or lower tier and joists supported by the second wall of the upper or lower tier, The second wall is disposed at a position spaced from the first wall, and the beam for the ceiling is provided near a wall in an area between the first wall and the second wall, from each wall to the vicinity of each wall. The distance of the said ceiling beam is 1/4 or less of the distance between the said 1st wall and the 2nd wall. the

In this case, since the distance from each wall to the ceiling beam near each wall is 1/4 or less of the distance between the first wall and the second wall, even if the floor is in the longitudinal direction of the end joist, for example, When vibrating in the first-order mode or second-order mode, the beam for the ceiling is not placed on the antinode of the vibration (the part with the largest amplitude) but near the node of the vibration (the part with the smallest amplitude). Therefore, the vibration transmitted from the floor to the ceiling can be reduced. the

Preferably, the set of joists comprising the side joists and the plurality of floor joists includes joists supported by the first wall of the upper or lower tier and joists supported by the second wall of the upper or lower tier, The second wall is disposed at a position spaced from the first wall, and the ceiling beams are provided near each wall in a region between the first wall and the second wall, and from each wall to the wall The distance between the nearby beams for the ceiling is 1/6 or less of the distance between the first wall and the second wall. the

In this case, since the distance from each wall to the ceiling beam near each wall is 1/6 or less of the distance between the first wall and the second wall, even if the floor is in the longitudinal direction of the end joist, for example, When vibrating in the first-order, second-order, or third-order mode, the beam for the ceiling is placed not on the antinode of vibration (the part with the largest amplitude) but at the node of the vibration (the part with the smallest amplitude). Nearby, it is also possible to reduce the vibration transmitted from the floor to the ceiling. the

Preferably, the set of joists comprising the side joists and the plurality of floor joists includes joists supported by the first wall of the upper or lower tier and joists supported by the second wall of the upper or lower tier, The second wall is disposed at a position spaced from the first wall, and the ceiling beams are provided near each wall in a region between the first wall and the second wall, and from each wall to the wall The distance between the nearby beams for the ceiling is 1/8 or less of the distance between the first wall and the second wall. the

In this case, since the distance from each wall to the ceiling beam near each wall is 1/8 or less of the distance between the first wall and the second wall, even if the floor is in the longitudinal direction of the end joist, for example, In the case of vibrating in the first-order to fourth-order modes, the beam for the ceiling is not placed on the antinode of the vibration (the part with the largest amplitude) but near the node of the vibration (the part with the smallest amplitude). It is also possible to reduce the vibration transmitted from the floor to the ceiling. the

Preferably, at least five floor joists are disposed between the first wall and the second wall, and the ceiling beams are provided within a range from the respective walls to the second floor joists. the

In this case, since the beam for the ceiling is provided at a position close to the wall, the large vibration amplitude of the floor is not transmitted to the ceiling, and the vibration can be reduced. the

The floor-ceiling structure of the second aspect is a floor-ceiling structure between an upper floor and a lower ceiling, and includes: a plurality of floor joists arranged in a specific direction in a state substantially parallel to each other; side joists The beams are disposed at positions sandwiching the floor joists from the above-mentioned specific direction in a state of being arranged approximately parallel to these floor joists; the end joists are disposed at positions sandwiching the above-mentioned floor joists in place and securing said side joists and ends of said floor joists; and a ceiling support for suspending said ceiling from said end joists; wherein said side joists and said plurality of floor joists At least one joist in a joist group composed of beams is supported by the wall of the upper or lower floor, and the ceiling support part includes: ceiling beams disposed across the end joists; suspension members suspended from the ceiling beams; A rib bolster installed on the above-mentioned suspension member; and a ceiling rib installed on the above-mentioned ceiling rib bolster and fixing the above-mentioned ceiling; wherein, at least one of the above-mentioned ceiling beam, the suspension component, the ceiling rib bolster, and the ceiling rib does not have It is installed in an area other than the vicinity of the above-mentioned wall. the

In the floor-ceiling structure according to the second aspect, the floor joists and the side joists are installed on the end joists substantially in parallel in a frame composed of side joists and end joists. In addition, the ceiling support portion is provided on the end joists in the frame composed of the side joists and the end joists. At least one joist in a joist group consisting of side joists and a plurality of floor joists is supported by a wall, and the ceiling support part includes ceiling beams, suspension parts, ceiling rib bolsters, ceiling ribs, ceiling beams, suspension parts, At least one of the ceiling bar bolster and the ceiling bar is not provided in the region other than the vicinity of the wall. the

Here, when a force acts on the floor to generate vibration, the vibration is transmitted to the frame composed of side joists and end joists. Since at least one joist in the joist group is supported by the wall, the vibration of the position of the frame body corresponding to the joist supported by the wall becomes small, and the vibration of a portion away from the position becomes large. Therefore, vibrations transmitted from the floor to the ceiling can be reduced by disposing at least one of the ceiling beams, suspension members, ceiling rib bolsters, and ceiling ribs constituting the ceiling supporting portion in areas other than the vicinity of the wall. Therefore, it is possible to reduce shock noise in a relatively large frequency band with a simple structure. In particular, since the weight floor impact sound contributes more to the solid propagating component than the air propagating component in such a structure, by setting at least one of the ceiling beam, the suspension member, the ceiling rib bolster, and the ceiling rib at least one of the vibration amplitude The larger part comes up to reduce vibration, and a greater reduction effect can be obtained. the

The floor-ceiling structure of the third aspect is a floor-ceiling structure between an upper floor and a lower ceiling, and includes: a plurality of floor joists arranged in a specific direction in a state of being substantially parallel to each other; side joists The beams are disposed in a position sandwiching the floor joists from the above-mentioned specific direction in a state of being arranged substantially parallel to these floor joists; the end joists are disposed so as to sandwich the above-mentioned floor joists on and secure said side joists and ends of said floor joists; and ceiling supports for suspending said ceiling from said end joists; wherein said side joists and said plurality of floor joists At least one joist in a joist group composed of beams is supported by the wall of the upper or lower floor, and the ceiling support part includes: ceiling beams disposed across the end joists; suspension members suspended from the ceiling beams; A tendon bolster installed on the above-mentioned suspension member; and a ceiling rib installed on the above-mentioned ceiling-beam bolster and fix the above-mentioned ceiling; wherein, in the area other than the vicinity of the above-mentioned wall, the above-mentioned beam for the ceiling, the suspension member, and the ceiling rib At least one of the bolster and the ceiling rib is not connected to other components. the

In the floor-ceiling structure according to the third aspect, the floor joists and the side joists are installed on the end joists substantially parallel to each other in a frame composed of the side joists and the end joists. In addition, the ceiling support portion is provided on the end joists in the frame composed of the side joists and the end joists. At least one joist in a joist group consisting of a side joist and a plurality of floor joists is supported by a wall. In addition, the ceiling supporting part includes ceiling beams, suspension members, ceiling rib bolsters, and ceiling bars, and at least one of the ceiling beams, suspension members, ceiling rib bolsters, and ceiling ribs is not connected to the area other than the vicinity of the wall. Links to other components. the

Here, when a force acts on the floor to generate vibration, the vibration is transmitted to the frame composed of side joists and end joists. Since at least one joist in the joist group is supported by the wall, the vibration of the position of the frame body corresponding to the joist supported by the wall becomes small, and the vibration of a portion away from the position becomes large. Therefore, by not connecting at least one of the beams for the ceiling, the suspension members, the ceiling rib bolsters, and the ceiling ribs constituting the ceiling supporting part in the area other than the vicinity of the above-mentioned wall, the transmission from the floor to the ceiling can be reduced. vibration. Therefore, it is possible to reduce shock noise in a relatively large frequency band with a simple structure. In particular, since the heavy floor impact sound contributes more to the solid propagating component than the air propagating component in such a structure, the ceiling beams, suspension parts, ceiling rib bolster, and ceiling rib At least one of them is connected to other components to reduce vibration, and a large reduction effect can be obtained. the

The floor-ceiling structure of the fourth aspect is a floor-ceiling structure between an upper floor and a lower ceiling, and includes: a plurality of floor joists arranged in a specific direction in a state of being substantially parallel to each other; side joists The beams are disposed in a position sandwiching the floor joists from the above-mentioned specific direction in a state of being arranged substantially parallel to these floor joists; the end joists are disposed so as to sandwich the above-mentioned the position of the floor joists and fixing the ends of the above-mentioned side joists and the above-mentioned floor joists; and a ceiling support portion for suspending the above-mentioned ceiling from the above-mentioned end joists; At least one joist in a joist group composed of beams is supported by the wall of the upper or lower floor, and the ceiling support portion includes: ceiling beams disposed across the end joists; suspension members suspended from the ceiling beams; and The ceiling rib is installed on the suspension member and fixes the ceiling; wherein at least one of the ceiling beam, the suspension member, and the ceiling rib is not provided in an area other than the vicinity of the wall. the

In the floor-ceiling structure according to the fourth aspect, the floor joists and the side joists are installed on the end joists substantially parallel to each other in a frame composed of side joists and end joists. In addition, the ceiling support portion is provided on the end joists in the frame composed of the side joists and the end joists. At least one joist in a joist group consisting of a side joist and a plurality of floor joists is supported by a wall, and the ceiling support part includes a ceiling beam, a suspension member, and a ceiling rib, and at least one of the ceiling beam, the suspension member, and ceiling rib One is not located in an area other than the vicinity of the wall. the

Here, when a force acts on the floor to generate vibration, the vibration is transmitted to the frame composed of side joists and end joists. Since at least one joist in the joist group is supported by the wall, the vibration of the position of the frame body corresponding to the joist supported by the wall becomes small, and the vibration of a portion away from the position becomes large. Therefore, vibration transmitted from the floor to the ceiling can be reduced by disposing at least one of the ceiling beams, suspension members, and ceiling ribs constituting the ceiling supporting portion in areas other than the vicinity of the wall. Therefore, it is possible to reduce shock noise in a relatively large frequency band with a simple structure. In particular, since the heavy floor impact sound contributes more to the solid propagating component than the air propagating component in such a structure, at least one of the ceiling beams, suspension parts, and ceiling ribs is not installed on the part with a large amplitude. Vibration is reduced, and a large reduction effect can be obtained. the

A floor-ceiling structure according to claim 5 is a floor-ceiling structure between an upper floor and a lower ceiling, and includes: a plurality of floor joists arranged in a specific direction in a state substantially parallel to each other; side joists The beams are disposed in a position sandwiching the floor joists from the above-mentioned specific direction in a state of being arranged substantially parallel to these floor joists; the end joists are disposed so as to sandwich the above-mentioned floor joists in place and securing said side joists and ends of said floor joists; and a ceiling support for suspending said ceiling from said end joists; wherein said side joists and said plurality of floor joists At least one joist in a joist group composed of beams is supported by the wall of the upper or lower floor, and the ceiling support portion includes: ceiling beams disposed across the end joists; suspension members suspended from the ceiling beams; and The ceiling rib is installed on the above-mentioned suspension member and fixes the above-mentioned ceiling; wherein, in the area other than the vicinity of the above-mentioned wall, at least one of the beams for the ceiling, the suspension member, and the ceiling rib is not connected to other parts. the

In the floor-ceiling structure according to the fifth aspect, the floor joists and the side joists are installed on the end joists substantially in parallel in a frame composed of side joists and end joists. In addition, the ceiling support portion is provided on the end joists in the frame composed of the side joists and the end joists. At least one joist in a joist group consisting of side joists and a plurality of floor joists is supported by a wall. In addition, the ceiling support part includes ceiling beams, suspension parts, and ceiling ribs. In the area other than the vicinity of the wall, the ceiling beams , at least one of the suspension components and ceiling ribs is not connected to other components. the

Here, when a force acts on the floor to generate vibration, the vibration is transmitted to the frame composed of side joists and end joists. Since at least one joist in the joist group is supported by the wall, the vibration of the position of the frame body corresponding to the joist supported by the wall becomes small, and the vibration of a portion away from the position becomes large. Therefore, by not connecting at least one of the beams for the ceiling, the suspension members, the ceiling rib bolsters, and the ceiling ribs constituting the ceiling supporting part in the area other than the vicinity of the above-mentioned wall, the transmission from the floor to the ceiling can be reduced. vibration. Therefore, it is possible to reduce shock noise in a relatively large frequency band with a simple structure. In particular, since the heavy floor impact sound contributes more to the solid propagating component than the air propagating component in such a structure, at least one of the beams for the ceiling, the suspension parts, and the ceiling ribs are not connected to each other in the part with a large amplitude. Other parts are connected to reduce vibration, and a large reduction effect can be obtained. the

Claims (9)

1. A floor-ceiling structure disposed between a floor on an upper layer and a ceiling on a lower layer, characterized by comprising:

a plurality of floor joists arranged in a specific direction in a state of being arranged substantially parallel to each other;

side joists arranged in a position that sandwiches the floor joists from the specific direction in a state of being arranged substantially parallel to the floor joists;

an end joist disposed at a position sandwiching the floor joist from a direction orthogonal to the specific direction, and fixing the side joist and an end of the floor joist, the end joist and the side joist constituting a frame; and

a ceiling beam for suspending the ceiling, the ceiling beam being disposed across the end joists and substantially parallel to the side joists; wherein,

at least one joist in the joist group consisting of the side joists and the plurality of floor joists is supported by the wall of the upper or lower floor,

the ceiling beam is provided only in the vicinity of the wall.

2. The floor-ceiling structure of claim 1,

the joist assembly comprising the side joists and the plurality of floor joists includes a joist supported by the 1 st wall of the upper or lower deck and a joist supported by the 2 nd wall of the upper or lower deck, the 2 nd wall being disposed at a position spaced from the 1 st wall,

the ceiling beam is provided in the vicinity of the wall in the region between the 1 st wall and the 2 nd wall,

the distance from each wall to the ceiling beam in the vicinity of each wall is 1/4 or less of the distance between the 1 st wall and the 2 nd wall.

3. The floor-ceiling structure of claim 1,

the joist assembly comprising the side joists and the plurality of floor joists includes a joist supported by the 1 st wall of the upper or lower deck and a joist supported by the 2 nd wall of the upper or lower deck, the 2 nd wall being disposed at a position spaced from the 1 st wall,

the ceiling beam is provided in the vicinity of each wall in the region between the 1 st wall and the 2 nd wall,

the distance from each wall to the ceiling beam in the vicinity of each wall is 1/6 or less of the distance between the 1 st wall and the 2 nd wall.

4. The floor-ceiling structure of claim 1,

the joist assembly comprising the side joists and the plurality of floor joists includes a joist supported by the 1 st wall of the upper or lower deck and a joist supported by the 2 nd wall of the upper or lower deck, the 2 nd wall being disposed at a position spaced from the 1 st wall,

the ceiling beam is provided in the vicinity of each wall in the region between the 1 st wall and the 2 nd wall,

the distance from each wall to the ceiling beam in the vicinity of each wall is 1/8 or less of the distance between the 1 st wall and the 2 nd wall.

5. The floor-ceiling structure of claim 1,

the joist assembly comprising the side joists and the plurality of floor joists includes a joist supported by the 1 st wall of the upper or lower deck and a joist supported by the 2 nd wall of the upper or lower deck, the 2 nd wall being disposed at a position spaced from the 1 st wall,

the ceiling beam is provided in the vicinity of each wall in the region between the 1 st wall and the 2 nd wall,

at least 5 floor joists are arranged between the 1 st wall and the 2 nd wall,

the ceiling beam is provided in a range from the walls to the 2 nd floor joist.

6. A floor-ceiling structure disposed between a floor on an upper layer and a ceiling on a lower layer, characterized by comprising:

a plurality of floor joists arranged in a specific direction in a state of being arranged substantially parallel to each other;

side joists arranged in a position that sandwiches the floor joists from the specific direction in a state of being arranged substantially parallel to the floor joists;

an end joist disposed at a position sandwiching the floor joist from a direction orthogonal to the specific direction, and fixing the side joist and an end of the floor joist, the end joist and the side joist constituting a frame; and

a ceiling support portion for suspending the ceiling from the end joists; wherein,

at least one joist in the joist group consisting of the side joists and the plurality of floor joists is supported by the wall of the upper or lower floor,

the ceiling support portion includes:

a ceiling beam disposed across the end joists;

a suspension member vertically provided on the ceiling beam;

a ceiling rib bolster mounted on the suspension member; and

the suspended ceiling rib is arranged on the suspended ceiling rib bearer and is used for fixing the ceiling; wherein,

one, two or three of the ceiling beams, the suspension members, the ceiling rib bearers and the ceiling ribs are provided in regions other than the vicinity of the wall, or the ceiling beams, the suspension members, the ceiling rib bearers and the ceiling ribs are all provided in regions in the vicinity of the wall.

7. A floor-ceiling structure disposed between a floor on an upper layer and a ceiling on a lower layer, characterized by comprising:

a plurality of floor joists arranged in a specific direction in a state of being arranged substantially parallel to each other;

side joists arranged in a position that sandwiches the floor joists from the specific direction in a state of being arranged substantially parallel to the floor joists;

an end joist disposed at a position sandwiching the floor joist from a direction orthogonal to the specific direction, and fixing the side joist and an end of the floor joist, the end joist and the side joist constituting a frame; and

a ceiling support portion for suspending the ceiling from the end joists; wherein,

at least one joist in the joist group consisting of the side joists and the plurality of floor joists is supported by the wall of the upper or lower floor,

the ceiling support portion includes:

a ceiling beam disposed across the end joists;

a suspension member vertically provided on the ceiling beam;

a ceiling rib bolster mounted on the suspension member; and

the suspended ceiling rib is arranged on the suspended ceiling rib bearer and is used for fixing the ceiling; wherein,

in the region other than the vicinity of the wall, two or three of the ceiling beams, the suspension members, the ceiling rib bearers, and the ceiling ribs are connected to each other.

8. A floor-ceiling structure disposed between a floor on an upper layer and a ceiling on a lower layer, characterized by comprising:

a plurality of floor joists arranged in a specific direction in a state of being arranged substantially parallel to each other;

side joists arranged in a position that sandwiches the floor joists from the specific direction in a state of being arranged substantially parallel to the floor joists;

an end joist disposed at a position sandwiching the floor joist from a direction orthogonal to the specific direction, and fixing the side joist and an end of the floor joist, the end joist and the side joist constituting a frame; and

a ceiling support portion for suspending the ceiling from the end joists; wherein,

at least one joist in the joist group consisting of the side joists and the plurality of floor joists is supported by the wall of the upper or lower floor,

the ceiling support portion includes:

a ceiling beam disposed across the end joists;

a suspension member vertically provided on the ceiling beam; and

a ceiling rib mounted on the suspension member and fixing the ceiling; wherein,

one or both of the ceiling beam, the suspension member, and the ceiling rib are provided in a region other than the vicinity of the wall, or the ceiling beam, the suspension member, and the ceiling rib are provided in a region in the vicinity of the wall.

9. A floor-ceiling structure disposed between a floor on an upper layer and a ceiling on a lower layer, characterized by comprising:

a plurality of floor joists arranged in a specific direction in a state of being arranged substantially parallel to each other;

side joists arranged in a position that sandwiches the floor joists from the specific direction in a state of being arranged substantially parallel to the floor joists;

an end joist disposed at a position sandwiching the floor joist from a direction orthogonal to the specific direction, and fixing the side joist and an end of the floor joist, the end joist and the side joist constituting a frame; and

a ceiling support portion for suspending the ceiling from the end joists; wherein,

at least one joist in the joist group consisting of the side joists and the plurality of floor joists is supported by the wall of the upper or lower floor,

the ceiling support portion includes:

a ceiling beam disposed across the end joists;

a suspension member vertically provided on the ceiling beam; and

a ceiling rib mounted on the suspension member and fixing the ceiling; wherein,

in the region other than the vicinity of the wall, two of the ceiling beam, the suspension member, and the ceiling rib are connected to each other.

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