Bed structure

Abstract

To provide floor structure that comprises a floor panel having a hollow portion and enables the vibration of the floor panel to be suppressed and furthermore enables the strength of the floor panel to be increased.SOLUTION: Floor structure 1 comprises: a floor panel 21 that has a hollow portion 211 extending in a predetermined longitudinal direction D1; and floor reinforcing steel material 3 that is inserted into the hollow portion 211. The floor reinforcing steel material 3 includes; a reinforcing steel material main body 4 extending in a longitudinal direction D1 within the hollow portion 211; and a dynamic vibration absorbing device 5 provided in the reinforcing steel material main body 4. The dynamic vibration absorbing device 5 includes a dynamic vibration reducer 51 that has an elastic member 511 fixed to the reinforcing steel material main body 4 and a weight member 512 supported by the elastic member 511. Both ends in a longitudinal direction D1, of the reinforcing steel material main body 4 is fixed to the inner surface of the hollow portion 211.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a floor structure of a building. [Background technology]

[0002] A floor structure of a building includes floor beams and floor panels provided on the floor beams. A technique for suppressing vibration in such a floor structure is disclosed in, for example, Patent Document 1. In the technique disclosed in Patent Document 1, a tuned mass damper is provided for the floor beams. This tuned mass damper includes a hollow rigid reinforcement body fixed to the floor beams and a mass provided inside the rigid reinforcement body via a viscoelastic material. The tuned mass damper is capable of suppressing vibration of the floor beams by causing the mass to move in the opposite direction based on inertia force in response to vibration of the floor beams. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2008-297751 A Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, in floor structures, floor panels having a hollow portion extending in a predetermined longitudinal direction may be used. In this case, in addition to suppressing vibration of the floor panel having a hollow portion, the strength of the floor panel is required to withstand a load applied to the floor panel in order to improve fire resistance in the event of a fire. However, the technology disclosed in Patent Document 1 does not assume the resistance to loads required of floor panels for office use, etc., and there is a risk that the strength of the floor panel will be insufficient.

[0005] The present invention has been made in consideration of the above circumstances, and its object is to provide a floor structure that can suppress vibration of a floor panel having a hollow portion while increasing the strength of the floor panel. [Means for solving the problem]

[0006] In order to solve the above problems, a floor structure according to a first invention is a floor structure for a building, comprising a floor panel having a hollow portion extending in a predetermined longitudinal direction, and a floor reinforcing steel material inserted into the hollow portion. The floor reinforcing steel material comprises a reinforcing steel material main body extending in the longitudinal direction within the hollow portion, an elastic member fixed to the reinforcing steel material main body, and a dynamic vibration absorbing device including a dynamic vibration absorber having a weight member extending in the longitudinal direction and supported by the elastic member. The reinforcing steel material main body is fixed to the inner surface of the hollow portion.

[0007] According to the floor structure of the first invention, in the floor reinforcing steel material inserted into the hollow portion of the floor panel, a reinforcing steel material main body is fixed to the inner surface of the hollow portion, and a dynamic vibration absorbing device including a dynamic vibration absorber is provided for the reinforcing steel material main body. This dynamic vibration absorbing device can suppress vibrations in the frequency band that determines heavy floor impact sound. This makes it possible to suppress floor impact sound caused by the application of impact force. Moreover, since the reinforcing steel material main body extends in the longitudinal direction within the hollow portion and is fixed to the inner surface of the hollow portion, it is possible to increase the strength of the floor panel having a hollow portion by utilizing the bending rigidity of the reinforcing steel material main body.

[0008] A second invention is a floor structure related to the first invention, wherein the floor panel has a one-side end region set within a predetermined range in the longitudinal direction from one end face in the longitudinal direction and allowing the formation of a cutout portion, and the reinforcing steel main body may be provided in a region other than the one-side end region in the longitudinal direction within the hollow portion.

[0009] In this embodiment, since the reinforcing steel body is provided in an area other than the longitudinal end area on one side of the hollow portion of the floor panel, a notch can be formed in the longitudinal end area on one side of the floor panel. By forming a notch in the longitudinal end area on one side of the floor panel, it is possible to avoid interference between the floor panel and a pillar material provided for the floor structure in the building.

[0010] A third invention is a floor structure related to the second invention, wherein the floor panel has an other-side end region set within a predetermined range in the longitudinal direction from the other end face in the longitudinal direction and allowing the formation of a cutout portion, and the reinforcing steel main body may be provided in a region within the hollow portion other than the one-side end region and the other-side end region in the longitudinal direction.

[0011] In this embodiment, it is possible to form a notch in both end regions of the one side end region and the other side end region in the longitudinal direction of the floor panel. Moreover, since the reinforcing steel body is provided in an area other than the one side end region and the other side end region in the longitudinal direction within the hollow portion, it is possible to maximize the reinforcement of the floor panel by the reinforcing steel body while allowing the formation of a notch in the floor panel.

[0012] A fourth invention is a floor structure according to any one of the first to third inventions, wherein the dynamic vibration absorbing device may include one or more dynamic vibration absorbers depending on the longitudinal length dimension of the reinforcing steel body corresponding to the longitudinal length dimension of the floor panel.

[0013] The dynamic vibration absorbers included in the dynamic vibration absorbing device have different natural frequencies depending on the difference in the longitudinal length of the weight member. Therefore, the natural frequency of the dynamic vibration absorbing device can be adjusted based on the combination of dynamic vibration absorbers. In this case, for example, the combination of dynamic vibration absorbers provided for the reinforcing steel body is set according to the longitudinal length of the reinforcing steel body corresponding to the longitudinal length of the floor panel. By using a dynamic vibration absorbing device whose natural frequency is adjusted based on the combination of dynamic vibration absorbers, it is possible to improve the vibration control performance in the band that determines the floor impact sound performance, even in a floor configuration in which multiple types of floor panels with different longitudinal lengths are combined in a complex manner. Therefore, it is possible to widely suppress floor impact sounds caused by the application of impact forces in accordance with each of multiple types of floor panels with different longitudinal lengths.

[0014] A fifth invention is a floor structure relating to any one of the first to fourth inventions, wherein the reinforcing steel body may be fixed to an upper surface of the hollow portion facing downward on the inner surface of the hollow portion while inserted into the hollow portion.

[0015] The floor structure is required to have fire resistance assuming a fire. In this case, when a floor panel is exposed to flames from below with a predetermined load applied from above, even if cracks or the like appear on the underside of the floor panel and the strength of the floor panel is reduced, the floor panel needs to have sufficient strength to withstand the load. Therefore, the reinforcing steel body is fixed to the upper surface of the hollow part facing downward on the inner surface of the hollow part while being inserted into the hollow part of the floor panel. In this case, even if a flame from below causes cracks or the like on the underside of the floor panel during a fire or the like and reduces the strength of the floor panel, the reinforcing steel body fixed to the upper surface of the hollow part can maintain a predetermined floor strength to withstand a predetermined load.

[0016] A sixth invention is a floor structure relating to any one of the first to fifth inventions, wherein the reinforcing steel main body has a peripheral wall portion surrounding an internal space centered on an axis extending in the longitudinal direction, and the dynamic vibration absorbing device may be provided on the peripheral wall portion within the internal space.

[0017] In this embodiment, the reinforcing steel body has a peripheral wall surrounding the internal space, which increases the bending rigidity, thereby enhancing the effect of increasing the strength of the floor panel. Moreover, the reinforcing steel body also has the function of protecting the dynamic vibration absorbing device provided on the peripheral wall within the internal space of the peripheral wall.

[0018] A seventh invention is the floor structure according to the sixth invention, wherein the height dimension of the reinforcing steel body in a vertical direction perpendicular to the longitudinal direction of the peripheral wall portion is set to a value smaller than the height dimension of the hollow portion in the vertical direction. In this case, when the reinforcing steel body is fixed to the hollow portion upper surface facing downward on the inner surface of the hollow portion, a gap is formed between the hollow portion upper surface and the opposing hollow portion lower surface on the inner surface of the hollow portion.

[0019] In this embodiment, the height dimension of the peripheral wall is set to a value smaller than the height dimension of the hollow portion, so that a gap is formed between the reinforcing steel body and the lower surface of the hollow portion while the reinforcing steel body is fixed to the upper surface of the hollow portion within the hollow portion. This makes it possible to suppress the transfer of heat from the lower surface to the upper surface of the floor panel via the reinforcing steel body when the lower surface of the floor panel is exposed to flames. This makes it possible to increase the strength of the floor panel by using the reinforcing steel body fixed to the upper surface of the hollow portion while suppressing the occurrence of cracks and the like on the upper surface of the floor panel due to flames from below.

[0020] An eighth invention is a floor structure relating to the sixth or seventh invention, wherein the peripheral wall portion may have an upper peripheral wall piece that covers the internal space from above and is fixed to the upper surface of the hollow portion facing downward on the inner surface of the hollow portion, and a lower peripheral wall piece that covers the internal space from below and is attached to the upper peripheral wall piece, to which the elastic member is fixed.

[0021] In this embodiment, the peripheral wall of the reinforcing steel body has an upper peripheral wall piece and a lower peripheral wall piece attached to the upper peripheral wall piece. In this case, the upper peripheral wall piece of the peripheral wall of the reinforcing steel body is fixed to the upper surface of the hollow portion within the hollow portion, thereby making it possible to increase the strength of the floor panel having a hollow portion. Moreover, the dynamic vibration absorber can be easily provided in the internal space of the peripheral wall by arranging the dynamic vibration absorber in the lower peripheral wall piece so that the elastic member of the dynamic vibration absorber is fixed thereto, and then attaching the lower peripheral wall piece to the upper peripheral wall piece. Effect of the Invention

[0022] As described above, according to the present invention, it is possible to provide a floor structure that is capable of suppressing vibration of a floor panel having a hollow portion and increasing the strength of the floor panel. [Brief description of the drawings]

[0023] [Figure 1] FIG. 1 is a perspective view of a floor structure according to an embodiment of the present invention. [Diagram 2] 1 is a cross-sectional view showing a state in which floor reinforcing steel material is inserted into a hollow portion of a floor panel in a floor structure. FIG. [Diagram 3] FIG. 2 is an exploded perspective view of a floor reinforcing steel material. [Figure 4] FIG. 2 is a cross-sectional view of a plurality of dynamic vibration absorbers included in a dynamic vibration absorbing device for floor reinforcing steel material. [Diagram 5] FIG. 11 is a cross-sectional view showing combinations of a reinforcing steel body and a dynamic vibration absorber in a floor reinforcing steel material according to differences in the length dimensions of the middle region of the floor panel, showing combinations corresponding to the first to third floor panels. [Figure 6] FIG. 11 is a cross-sectional view showing combinations of reinforcing steel bodies and dynamic vibration absorbers in floor reinforcing steel materials according to differences in the length dimensions of the middle region of the floor panels, showing combinations corresponding to the fourth and fifth floor panels. [Figure 7] FIG. 11 is a cross-sectional view showing combinations of reinforcing steel bodies and dynamic vibration absorbers in floor reinforcing steel materials according to differences in the length dimensions of the middle region of the floor panels, showing combinations corresponding to the sixth and seventh floor panels. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] Below, a floor structure according to an embodiment of the present invention will be described with reference to the drawings. In the following, directional relationships will be described using XYZ orthogonal coordinate axes. The X-axis direction is parallel to the horizontal plane, the Y-axis direction is perpendicular to the X-axis direction on the horizontal plane, and the Z-axis direction is the up-down direction perpendicular to both the X and Y directions.

[0025] Fig. 1 shows a floor structure 1 according to this embodiment. Fig. 2 shows a state in which a floor reinforcing steel material 3 is inserted into a hollow portion 211 of a floor panel 21, and Fig. 3 shows a perspective view of the floor reinforcing steel material 3. The floor structure 1 is, for example, a part of a steel-framed building, and constitutes a floor of one story. The floor structure 1 comprises a floor body 2 including a floor panel 21 having a hollow portion 211 extending in a predetermined longitudinal direction D1, the floor reinforcing steel material 3 inserted into the hollow portion 211, a plurality of floor beams 6 supporting the floor panel 21, and a plurality of vibration-proof materials 7 provided on the floor beams 6.

[0026] In the example of Fig. 1, multiple floor beams 6 extend in the X-axis direction and are arranged parallel to each other at a predetermined interval in the Y-axis direction. The floor beams 6 are, for example, made of H-shaped steel with an H-shaped cross section. In this case, the floor beams 6 have a pair of flanges 61 and a web 62 connecting both flanges 61. The floor beams 6 are arranged so that the pair of flanges 61 extend in the X-axis direction with the pair of flanges 61 aligned in the Z-axis direction.

[0027] The floor panel 21 of the floor body 2 is supported by each floor beam 6 from below in a state in which it is arranged so as to straddle between two adjacent floor beams 6. The floor panel 21 is, for example, made of a hollow extruded cement board, and has at least one hollow portion 211 extending in a predetermined longitudinal direction D1. The floor panel 21 is a plate-shaped member having a rectangular planar shape extending in the longitudinal direction D1 of the hollow portion 211. The floor panel 21 is bridged between the two floor beams 6 as shown in FIG. 1 in a state in which the longitudinal direction D1 of the hollow portion 211 coincides with the Y-axis direction. Specifically, each end of the floor panel 21 in the longitudinal direction D1 (Y-axis direction) is supported from below by the flange 61 of each floor beam 6. The shape of the hollow portion 211 as viewed in the longitudinal direction D1 is not particularly limited, but is, for example, rectangular. In the example of FIG. 1, the floor panel 21 has six hollow portions 211 arranged in the X-axis direction.

[0028] As shown in FIG. 2, the floor panel 21 has a pair of end regions 21RA provided at both ends in the longitudinal direction D1, and an intermediate region 21RB between the pair of end regions 21RA in the longitudinal direction D1. The pair of end regions 21RA includes a one-side end region set in a predetermined range in the longitudinal direction D1 from one end face of the floor panel 21 in the longitudinal direction D1, and an other-side end region set in a predetermined range in the longitudinal direction D1 from the other end face of the floor panel 21 in the longitudinal direction D1. The intermediate region 21RB is an area of ​​the floor panel 21 other than the pair of end regions 21RA. In the floor panel 21, the pair of end regions 21RA are supported by the floor beam 6 and are areas that allow the formation of a notch portion 22 to avoid interference with the pillar material 8 erected on the floor beam 6 shown in FIG. 1. Note that only one side end region of the pair of end regions 21RA may be an area that allows the formation of the notch portion 22.

[0029] 2, the floor panel 21 has a plurality of bolt holes 212 that communicate with the hollow portion 211 in the intermediate region 21RB and through which the bolts 9 are inserted. In this embodiment, the plurality of bolt holes 212 are holes that extend from the upper surface of the floor panel 21 to the hollow portion 211, and are provided at least at both ends in the longitudinal direction D1 of the floor panel 21. The bolt holes 212 may be provided in a region between both ends in the longitudinal direction D1 of the floor panel 21. The plurality of bolt holes 212 may be formed with countersunk holes so as to prevent the heads of the inserted bolts 9 from protruding upward from the upper surface of the floor panel 21.

[0030] Each of the plurality of vibration-proof materials 7 is a member that can elastically deform in response to the relative movement of the floor panel 21 with respect to the floor beam 6. The vibration-proof materials 7 are made of, for example, synthetic resin such as polyurethane, or rubber. Each of the plurality of vibration-proof materials 7 suppresses the transmission of vibration from the floor panel 21 to the floor beam 6 by elastically deforming between the floor beam 6 and the floor panel 21. The dimensions, hardness, arrangement position, and number of the vibration-proof materials 7 are set based on the load received by the vibration-proof materials 7 (i.e., the weight of the floor panel 21 placed on the vibration-proof materials 7 and the load received by the floor panel 21) so as to be able to appropriately suppress the transmission of vibration from the floor panel 21 to the floor beam 6. FIG. 1 shows an example in which the plurality of vibration-proof materials 7 are arranged on the upper flange 61 of a pair of flanges 61 of the floor beam 6.

[0031] As shown in Fig. 1 and Fig. 2, the floor reinforcing steel material 3 is a structure that is used by being inserted into a hollow portion 211 of a floor panel 21. When the floor panel 21 has a plurality of hollow portions 211, the floor reinforcing steel material 3 is inserted into one or more of the hollow portions 211. For example, as shown in Fig. 1, when the floor panel 21 has six hollow portions 211 aligned in the X-axis direction, the floor reinforcing steel material 3 may be inserted into all of the six hollow portions 211, the floor reinforcing steel material 3 may be inserted into one of the six hollow portions 211, or the floor reinforcing steel material 3 may be inserted into two or more but less than six of the six hollow portions 211.

[0032] The floor reinforcing steel material 3 will be described in detail with reference to Fig. 3 in addition to Fig. 2. The floor reinforcing steel material 3 comprises a reinforcing steel body 4 and a dynamic vibration absorbing device 5 provided for the reinforcing steel body 4.

[0033] The reinforcing steel body 4 is made of steel. The reinforcing steel body 4 has a cross-sectional shape that allows it to be inserted into the hollow portion 211 of the floor panel 21, and is fixed to the inner surface of the hollow portion 211 when inserted into the hollow portion 211. The reinforcing steel body 4 has a predetermined length extending in the longitudinal direction D1 of the hollow portion 211, and has a predetermined bending rigidity with respect to the longitudinal direction D1. The reinforcing steel body 4 extends in the longitudinal direction D1 within the hollow portion 211, and at least both ends in the longitudinal direction D1 are fixed to the inner surface of the hollow portion 211.

[0034] The dynamic vibration absorber 5 includes a dynamic vibration absorber 51 having an elastic member 511 fixed to the reinforcing steel body 4 and a weight member 512 extending in the longitudinal direction D1 and supported by the elastic member 511. In the dynamic vibration absorber 51, the elastic member 511 is a member that can elastically deform in response to the relative movement of the weight member 512 with respect to the reinforcing steel body 4 fixed to the inner surface of the hollow portion 211 of the floor panel 21. The elastic member 511 is made of, for example, synthetic resin such as polyurethane or rubber. The weight member 512 is made of, for example, steel. In the dynamic vibration absorber 5, when the floor panel 21 to which an impact force is applied vibrates, the weight member 512 supported by the elastic member 511 in the dynamic vibration absorber 51 moves in the opposite direction based on the inertial force with respect to the vibration of the floor panel 21, thereby suppressing the vibration of the floor panel 21. Note that in the dynamic vibration absorber 51, the number and the position of the elastic members 511 arranged relative to the weight members 512 are not particularly limited. For example, the elastic members 511 may be arranged only at each of the positions at both ends of the weight member 512 in the longitudinal direction D1, or the elastic members 511 may be arranged at each of the positions at both ends of the weight member 512 in the longitudinal direction D1 and at one or more positions between the ends.

[0035] In the floor structure 1 according to this embodiment, in the floor reinforcing steel material 3 inserted into the hollow portion 211 of the floor panel 21, a reinforcing steel material body 4 is fixed to the inner surface of the hollow portion 211, and a dynamic vibration absorbing device 5 including a dynamic vibration absorber 51 is provided for the reinforcing steel material body 4. This dynamic vibration absorbing device 5 can suppress the resonance phenomenon around the natural frequency of the floor panel 21. This makes it possible to suppress the vibration of the floor panel 21 caused by the application of an impact force. This makes it possible to improve the blocking performance of floor impact sound (hereinafter referred to as "heavy floor impact sound") having a frequency band (for example, an octave band center frequency of 63 Hz) that is an index of the floor structure 1.

[0036] Furthermore, the reinforcing steel body 4 extends in the longitudinal direction D1 within the hollow portion 211, and at least both ends in the longitudinal direction D1 are fixed to the inner surface of the hollow portion 211, so that it is possible to increase the strength of the floor panel 21 having the hollow portion 211 by utilizing the bending rigidity of the reinforcing steel body 4.

[0037] As shown in Fig. 2, the reinforcing steel body 4 is provided in the hollow portion 211 in the longitudinal direction D1 in an intermediate region 21RB other than the pair of end regions 21RA. This makes it possible to form cutout portions 22 in the pair of end regions 21RA of the floor panel 21. By forming the cutout portions 22 in the pair of end regions 21RA of the floor panel 21, it is possible to avoid interference between the column materials 8 provided in the floor structure 1 in a building and the floor panel 21, as shown in Fig. 1.

[0038] The reinforcing steel body 4 may have a length that allows it to be disposed over the entire area in the longitudinal direction D1 in the intermediate region 21RB of the floor panel 21. In this case, the reinforcing steel body 4 extends over the entire area of ​​the intermediate region 21RB in the longitudinal direction D1 within the hollow portion 211 except for a pair of end regions 21RA. This allows the floor panel 21 to be reinforced to the maximum extent by the reinforcing steel body 4 while allowing the formation of notches 22 in the pair of end regions 21RA of the floor panel 21. The reinforcing steel body 4 may extend over the entire area between both ends in the longitudinal direction D1 within the hollow portion 211.

[0039] 2 and 3, the reinforcing steel body 4 has a peripheral wall 41 that surrounds an internal space 41A centered on an axis extending in the longitudinal direction D1. In this case, a dynamic vibration absorbing device 5 including a dynamic vibration absorber 51 is provided in the internal space 41A surrounded by the peripheral wall 41. Since the reinforcing steel body 4 has the peripheral wall 41 that surrounds the internal space 41A, the bending rigidity is increased, thereby enhancing the effect of increasing the strength of the floor panel 21. Moreover, the reinforcing steel body 4 also has the function of protecting the dynamic vibration absorbing device 5 provided in the internal space 41A of the peripheral wall 41.

[0040] Here, in the floor structure 1, the floor panel 21 needs to have a strength sufficient to withstand the live load applied to the floor panel 21. For example, the floor structure 1 is required to have fire resistance assuming a fire. In this case, when the floor panel 21 is exposed to flames from below while a predetermined live load is applied to it from above, even if cracks or the like occur on the underside of the floor panel 21 and the strength of the floor panel 21 is reduced, the floor panel 21 needs to have a strength sufficient to withstand the live load.

[0041] Therefore, it is desirable that the reinforcing steel body 4, while inserted into the hollow portion 211, be fixed to the hollow portion upper surface 2111, which faces downward in the up-down direction (Z-axis direction) perpendicular to the longitudinal direction D1 on the inner surface of the hollow portion 211. In this case, even if flames from below cause cracks on the underside of the floor panel 21 in the event of a fire or the like, reducing the strength of the floor panel 21, the reinforcing steel body 4 having the peripheral wall portion 41 fixed to the hollow portion upper surface 2111 can maintain a predetermined floor strength to withstand a predetermined load and prevent the floor panel 21 from falling.

[0042] 2, it is preferable that the height dimension H2 of the reinforcing steel body 4 along the vertical direction (Z-axis direction) of the peripheral wall portion 41 is set to a value smaller than the height dimension H1 along the vertical direction of the hollow portion 211. In this case, when the reinforcing steel body 4 is fixed to the hollow portion upper surface 2111 in the hollow portion 211, a gap GP is formed between the hollow portion upper surface 2111 and the hollow portion lower surface 2112 facing the hollow portion upper surface 2111 on the inner surface of the hollow portion 211. This makes it possible to suppress the transfer of heat from the lower surface to the upper surface of the floor panel 21 via the reinforcing steel body 4 when the lower surface of the floor panel 21 is exposed to flames. For this reason, it is possible to increase the strength of the floor panel 21 by the reinforcing steel body 4 fixed to the hollow portion upper surface 2111 while suppressing the occurrence of cracks and the like on the upper surface of the floor panel 21 due to flames from below.

[0043] In the reinforcing steel body 4, the peripheral wall portion 41 has an upper peripheral wall piece 411 that covers the internal space 41A from above, and a lower peripheral wall piece 412 that covers the internal space 41A from below and is attached to the upper peripheral wall piece 411. The upper peripheral wall piece 411 is fixed to the hollow portion upper surface 2111 within the hollow portion 211. An elastic member 511 of the dynamic vibration absorber 51 in the dynamic vibration absorbing device 5 is fixed to the lower peripheral wall piece 412. By fixing the upper peripheral wall piece 411 of the peripheral wall portion 41 to the hollow portion upper surface 2111 within the hollow portion 211, the reinforcing steel body 4 can increase the strength of the floor panel 21 having the hollow portion 211. Furthermore, the dynamic vibration absorbing device 5 is placed on the lower peripheral wall piece 412 so that the elastic member 511 of the dynamic vibration absorber 51 is fixed, and then the lower peripheral wall piece 412 is attached to the upper peripheral wall piece 411 with a screw SC or the like, thereby making it possible to easily install the dynamic vibration absorbing device 5 within the internal space 41A of the peripheral wall portion 41.

[0044] In the peripheral wall portion 41 of the reinforcing steel body 4, the upper peripheral wall piece 411 has a first upper plate portion 4111 extending in the longitudinal direction D1 and fixed to the hollow portion upper surface 2111 in the hollow portion 211, and a pair of second upper plate portions 4112 extending in the longitudinal direction D1 and connected to both side end portions of the first upper plate portion 4111. On the other hand, the lower peripheral wall piece 412 extends in the longitudinal direction D1 and has a first lower plate portion 4121 to which the elastic member 511 of the dynamic vibration absorber 51 is fixed, and a pair of second lower plate portions 4122 extending in the longitudinal direction D1 and connected to both side end portions of the first lower plate portion 4121, respectively.

[0045] The reinforcing steel body 4 has a first upper plate portion 4111 of the upper peripheral wall piece 411 and has a plurality of through holes 411A arranged at intervals that allow communication with the plurality of bolt holes 212 in the floor panel 21. As shown in Fig. 2, when the reinforcing steel body 4 is inserted into the hollow portion 211 of the floor panel 21, the plurality of through holes 411A communicate with the plurality of bolt holes 212. Then, when the first upper plate portion 4111 of the upper peripheral wall piece 411 of the reinforcing steel body 4 inserted into the hollow portion 211 abuts against the hollow portion upper surface 2111 inside the hollow portion 211, the reinforcing steel body 4 is fixed to the hollow portion upper surface 2111 by bolts 9 inserted from above through each bolt hole 212 and each through hole 411A.

[0046] The method of fixing the reinforcing steel body 4 to the hollow upper surface 2111 in the hollow portion 211 is not particularly limited. In this embodiment, as shown in Fig. 2, the reinforcing steel body 4 is provided with a nut 411B having a threaded portion that can be screwed with the bolt 9, at a position that can communicate with each through hole 411A in the first upper plate portion 4111 of the upper peripheral wall piece 411. In this case, the reinforcing steel body 4 is fixed to the hollow upper surface 2111 in the hollow portion 211 by screwing the bolt 9 inserted through each bolt hole 212 and each through hole 411A into the threaded portion of the nut 411B.

[0047] Next, the relationship between the floor body 2 including the floor panel 21 in the floor structure 1 and the floor reinforcing steel materials 3 will be described with reference to Figs.

[0048] As shown in Figures 5 to 7, the floor body 2 includes first to seventh floor panels 21A to 21G as a plurality of types of floor panels 21 having different panel intermediate length dimensions, which are the length dimensions of the intermediate region 21RB in the longitudinal direction D1. The first to seventh floor panels 21A to 21G have different panel intermediate length dimensions set to different values ​​in the longitudinal direction D1, while the panel end length dimensions, which are the length dimensions of a pair of end regions 21RA, are set to be the same. The panel intermediate length dimensions of each of the first to seventh floor panels 21A to 21G are set to a length dimension obtained by adding an integer multiple of the reference dimension LS to the minimum panel intermediate length dimension LPS, which is set as the minimum value.

[0049] Specifically, the first floor panel 21A is the smallest floor panel among the first to seventh floor panels 21A to 21G, and the panel intermediate length dimension of the first floor panel 21A is set to the minimum panel intermediate length dimension LPS. In the first floor panel 21A, the intermediate region 21RB occupies a proportion exceeding 50% of the entire panel, and the remainder is the pair of end regions 21RA. That is, the minimum panel intermediate length dimension LPS indicated by the panel intermediate length dimension of the first floor panel 21A is set to a value exceeding 50% and less than 100% of the entire length of the first floor panel 21A in the longitudinal direction D1. For example, the minimum panel intermediate length dimension LPS is set to a value obtained by subtracting twice the value of the panel end length dimension corresponding to the length dimension of the pair of end regions 21RA from the entire length of the first floor panel 21A in the longitudinal direction D1. The minimum panel intermediate length dimension LPS corresponds to approximately 70% of the entire length of the first floor panel 21A in the longitudinal direction D1. For example, if the overall length of the first floor panel 21A is 490 mm and the panel end length dimension is 70 mm, the minimum panel intermediate length dimension LPS is set to 350 mm, which is 490 mm minus 140 mm, which is twice 70 mm.

[0050] The reference dimension LS is set based on the length dimension of the first floor panel 21A in the longitudinal direction D1, and is set to a value that is greater than the panel end length dimension of the first floor panel 21A and smaller than the minimum panel intermediate length dimension LPS. For example, the reference dimension LS is set to a value that is approximately 50% of the total length of the first floor panel 21A in the longitudinal direction D1, and when the total length of the first floor panel 21A is 490 mm, the reference dimension LS is set to 250 mm, which is approximately 50% of 490 mm.

[0051] The second floor panel 21B has a panel intermediate length dimension set to a value obtained by adding the reference dimension LS to the minimum panel intermediate length dimension LPS. The third floor panel 21C has a panel intermediate length dimension set to a value obtained by adding twice the reference dimension LS to the minimum panel intermediate length dimension LPS. The fourth floor panel 21D has a panel intermediate length dimension set to a value obtained by adding three times the reference dimension LS to the minimum panel intermediate length dimension LPS. The fifth floor panel 21E has a panel intermediate length dimension set to a value obtained by adding four times the reference dimension LS to the minimum panel intermediate length dimension LPS. The sixth floor panel 21F has a panel intermediate length dimension set to a value obtained by adding five times the reference dimension LS to the minimum panel intermediate length dimension LPS. The seventh floor panel 21G has a panel intermediate length dimension set to a value obtained by adding six times the reference dimension LS to the minimum panel intermediate length dimension LPS.

[0052] While the floor structure 2 includes multiple types of first to seventh floor panels 21A-21G with different panel mid-length dimensions, the floor reinforcing steel material 3 includes first to seventh reinforcing steel material bodies 4A-4G as the same number of reinforcing steel material bodies 4 as the first to seventh floor panels 21A-21G, as shown in Figures 5 to 7. The first to seventh reinforcing steel material bodies 4A-4G have different body length dimensions LB, which are the length dimensions in the longitudinal direction D1. The body length dimensions LB of the first to seventh reinforcing steel material bodies 4A-4G are set to correspond to the panel mid-length dimensions of the first to seventh floor panels 21A-21G, respectively.

[0053] The first reinforcing steel body 4A is inserted into the hollow portion 211 of the first floor panel 21A. The body length dimension LB of the first reinforcing steel body 4A is the same as the minimum panel intermediate length dimension LPS set as the panel intermediate length dimension of the first floor panel 21A. The second reinforcing steel body 4B is inserted into the hollow portion 211 of the second floor panel 21B. The body length dimension LB of the second reinforcing steel body 4B is the same as the minimum panel intermediate length dimension LPS set as the panel intermediate length dimension of the second floor panel 21B plus the reference dimension LS. The third reinforcing steel body 4C is inserted into the hollow portion 211 of the third floor panel 21C. The body length dimension LB of the third reinforcing steel body 4C is the same as the minimum panel intermediate length dimension LPS set as the panel intermediate length dimension of the third floor panel 21C plus twice the reference dimension LS. The fourth reinforcing steel body 4D is inserted into the hollow portion 211 of the fourth floor panel 21D. The body length dimension LB of the fourth reinforcing steel body 4D is equal to the minimum panel intermediate length dimension LPS set as the panel intermediate length dimension of the fourth floor panel 21D plus three times the reference dimension LS. The fifth reinforcing steel body 4E is inserted into the hollow portion 211 of the fifth floor panel 21E. The body length dimension LB of the fifth reinforcing steel body 4E is equal to the minimum panel intermediate length dimension LPS set as the panel intermediate length dimension of the fifth floor panel 21E plus four times the reference dimension LS. The sixth reinforcing steel body 4F is inserted into the hollow portion 211 of the sixth floor panel 21F. The body length dimension LB of the sixth reinforcing steel body 4F is equal to the minimum panel intermediate length dimension LPS set as the panel intermediate length dimension of the sixth floor panel 21F plus five times the reference dimension LS. The seventh reinforcing steel body 4G is inserted into the hollow portion 211 of the seventh floor panel 21G. The body length dimension LB of the seventh reinforcing steel body 4G is equal to the minimum panel intermediate length dimension LPS set as the panel intermediate length dimension of the seventh floor panel 21G plus six times the reference dimension LS.

[0054] While the floor reinforcing steel material 3 includes first to seventh reinforcing steel bodies 4A to 4G which are the same in number as the first to seventh floor panels 21A to 21G and have different body length dimensions LB, the dynamic vibration absorbing device 5 of the floor reinforcing steel material 3 includes first to third dynamic vibration absorbers 51A to 51C as a predetermined number of dynamic vibration absorbers 51 which is less than the number of the first to seventh reinforcing steel bodies 4A to 4G, as shown in Fig. 4. In the dynamic vibration absorbing device 5, the first to third dynamic vibration absorbers 51A to 51C have different natural frequencies according to differences in the weight length dimension LW, which is the length dimension in the longitudinal direction D1 of the weight member 512.

[0055] The weight length dimension LW of the weight member 512 in the first to third dynamic vibration absorbers 51A to 51C is set corresponding to the body length dimension LB of the first to third reinforcing steel body 4A to 4C, which has the smallest body length dimension LB among the first to seventh reinforcing steel body 4A to 4G. The weight length dimension LW of the weight member 512 of the first dynamic vibration absorber 51A is the same as the minimum panel mid-length dimension LPS, like the body length dimension LB of the first reinforcing steel body 4A. The weight length dimension LW of the weight member 512 of the second dynamic vibration absorber 51B is the same as the minimum panel mid-length dimension LPS plus the reference dimension LS, like the body length dimension LB of the second reinforcing steel body 4B. The weight length dimension LW of the weight member 512 of the third dynamic vibration absorber 51C is the same as the minimum panel mid-length dimension LPS plus twice the reference dimension LS, like the body length dimension LB of the third reinforcing steel body 4C.

[0056] The predetermined number of first to third dynamic vibration absorbers 51A to 51C included in the dynamic vibration absorber 5 have different natural frequencies depending on the difference in the weight length dimension LW of the weight member 512 and the spring constant of the elastic member 511. For this reason, in the dynamic vibration absorber 5, it is possible to adjust the natural frequency of the dynamic vibration absorber 5 based on a combination of the predetermined number of first to third dynamic vibration absorbers 51A to 51C. As shown in Figs. 5 to 7, in the dynamic vibration absorber 5, the combination of the first to third dynamic vibration absorbers 51A to 51C provided for each of the first to seventh reinforcing steel body 4A to 4G is set according to the body length dimension LB of the first to seventh reinforcing steel body 4A to 4G corresponding to the length dimension of the intermediate region 21RB in the first to seventh floor panels 21A to 21G. In this case, the combination of the first to third dynamic vibration absorbers 51A to 51C provided for the first to seventh reinforcing steel bodies 4A to 4G, respectively, is set according to the natural frequency of the dynamic vibration absorber 5 and the determining frequency of the target floor impact sound.

[0057] That is, in the floor structure 1, the dynamic vibration absorbing device 5 includes one or more dynamic vibration absorbers 51 selected from a predetermined number of first to third dynamic vibration absorbers 51A to 51C according to the main body length dimension LB of the first to seventh reinforcing steel main bodies 4A to 4G corresponding to the length dimension of the intermediate region 21RB in the first to seventh floor panels 21A to 21G.

[0058] Specifically, as shown in Fig. 5, a dynamic vibration absorbing device 5 consisting only of a first dynamic vibration absorber 51A having a weight member 512 whose weight length dimension LW is the same as the minimum panel intermediate length dimension LPS is provided for a first reinforcing steel body 4A inserted into the hollow portion 211 of the first floor panel 21A and having a body length dimension LB set to the same value as the minimum panel intermediate length dimension LPS. A dynamic vibration absorbing device 5 consisting only of a second dynamic vibration absorber 51B having a weight member 512 whose weight length dimension LW is the same as the minimum panel intermediate length dimension LPS plus the reference dimension LS is provided for a second reinforcing steel body 4B inserted into the hollow portion 211 of the second floor panel 21B and having a body length dimension LB set to the same value as the minimum panel intermediate length dimension LPS plus the reference dimension LS. For a third reinforcing steel body 4C which is inserted into the hollow portion 211 of the third floor panel 21C and has a body length dimension LB set to a value equal to the minimum panel intermediate length dimension LPS plus twice the reference dimension LS, a dynamic vibration absorbing device 5 consisting only of a third dynamic vibration absorber 51C having a weight member 512 whose weight length dimension LW is equal to the minimum panel intermediate length dimension LPS plus twice the reference dimension LS is provided.

[0059] As shown in Figure 6, for a fourth reinforcing steel body 4D inserted into the hollow portion 211 of the fourth floor panel 21D and with a body length dimension LB set to a value equal to the minimum panel intermediate length dimension LPS plus three times the reference dimension LS, a dynamic vibration absorbing device 5 is provided which consists of a combination of a first dynamic vibration absorber 51A having a weight member 512 whose weight length dimension LW is equal to the minimum panel intermediate length dimension LPS, and a second dynamic vibration absorber 51B having a weight member 512 whose weight length dimension LW is equal to the minimum panel intermediate length dimension LPS plus the reference dimension LS. For a fifth reinforcing steel body 4E which is inserted into the hollow portion 211 of the fifth floor panel 21E and has a body length dimension LB set to a value equal to the minimum panel intermediate length dimension LPS plus four times the reference dimension LS, a dynamic vibration absorbing device 5 is provided which comprises a combination of a first dynamic vibration absorber 51A having a weight member 512 whose weight length dimension LW is equal to the minimum panel intermediate length dimension LPS, and a third dynamic vibration absorber 51C having a weight member 512 whose weight length dimension LW is equal to the minimum panel intermediate length dimension LPS plus twice the reference dimension LS.

[0060] As shown in Figure 7, for a sixth reinforcing steel body 4F that is inserted into the hollow portion 211 of the sixth floor panel 21F and has a body length dimension LB set to a value equal to the minimum panel intermediate length dimension LPS plus five times the reference dimension LS, a dynamic vibration absorbing device 5 is provided that is composed of a second dynamic vibration absorber 51B having a weight member 512 whose weight length dimension LW is equal to the minimum panel intermediate length dimension LPS plus the reference dimension LS, and a third dynamic vibration absorber 51C having a weight member 512 whose weight length dimension LW is equal to the minimum panel intermediate length dimension LPS plus twice the reference dimension LS. For the seventh reinforcing steel body 4G which is inserted into the hollow portion 211 of the seventh floor panel 21G and has a body length dimension LB set to a value equal to the minimum panel intermediate length dimension LPS plus six times the reference dimension LS, a dynamic vibration absorbing device 5 is provided which is composed of two third dynamic vibration absorbers 51C which have weight members 512 whose weight length dimension LW is equal to the minimum panel intermediate length dimension LPS plus two times the reference dimension LS.

[0061] As explained above, the combination of the first to third dynamic vibration absorbers 51A to 51C provided for each of the first to seventh reinforcing steel body 4A to 4G is set according to the natural frequency of the dynamic vibration absorber 5 and the target floor impact sound determining frequency, and according to the main body length dimension LB of the first to seventh reinforcing steel body 4A to 4G corresponding to the length dimension of the middle region 21RB in the first to seventh floor panels 21A to 21G. This makes it possible to improve the vibration control performance in the band that determines the floor impact sound performance even in a floor configuration in which multiple types of first to seventh floor panels 21A to 21G with different length dimensions of the middle region 21RB are combined in a complex manner by the dynamic vibration absorber 5 whose natural frequency is adjusted based on the combination of a predetermined number of first to third dynamic vibration absorbers 51A to 51C. Therefore, it is possible to widely suppress floor impact sound caused by the application of impact force corresponding to each of multiple types of first to seventh floor panels 21A to 21G with different length dimensions of the middle region 21RB. As a result, it is possible to improve the blocking performance of heavy floor impact sound in accordance with each of the plurality of types of the first to seventh floor panels 21A to 21G.

[0062] Moreover, the first to seventh reinforcing steel bodies 4A-4G fixed to the inner surface of the hollow portion 211 of each of the first to seventh floor panels 21A-21G of multiple types have a body length dimension LB that is the same as the length dimension of the middle region 21RB of each floor panel, and have a predetermined bending rigidity in the longitudinal direction D1. This makes it possible to increase the strength of each of the first to seventh floor panels 21A-21G of multiple types having the hollow portion 211.

[0063] The above-mentioned specific embodiment mainly includes the invention having the following configuration.

[0064] A floor structure according to a first invention is a floor structure for a building, comprising a floor panel having a hollow portion extending in a predetermined longitudinal direction, and a floor reinforcing steel material inserted into the hollow portion. The floor reinforcing steel material comprises a reinforcing steel material main body extending in the longitudinal direction within the hollow portion, an elastic member fixed to the reinforcing steel material main body, and a dynamic vibration absorbing device including a dynamic vibration absorber having a weight member extending in the longitudinal direction and supported by the elastic member. The reinforcing steel material main body is fixed to the inner surface of the hollow portion.

[0065] A second invention is a floor structure related to the first invention, wherein the floor panel has a one-side end region set within a predetermined range in the longitudinal direction from one end face in the longitudinal direction and allowing the formation of a cutout portion, and the reinforcing steel main body may be provided in a region other than the one-side end region in the longitudinal direction within the hollow portion.

[0066] A third invention is a floor structure related to the second invention, wherein the floor panel has an other-side end region set within a predetermined range in the longitudinal direction from the other end face in the longitudinal direction and allowing the formation of a cutout portion, and the reinforcing steel main body may be provided in a region within the hollow portion other than the one-side end region and the other-side end region in the longitudinal direction.

[0067] A fourth invention is a floor structure according to any one of the first to third inventions, wherein the dynamic vibration absorbing device may include one or more dynamic vibration absorbers depending on the longitudinal length dimension of the reinforcing steel body corresponding to the longitudinal length dimension of the floor panel.

[0068] A fifth invention is a floor structure relating to any one of the first to fourth inventions, wherein the reinforcing steel body may be fixed to an upper surface of the hollow portion facing downward on the inner surface of the hollow portion while inserted into the hollow portion.

[0069] A sixth invention is a floor structure relating to any one of the first to fifth inventions, wherein the reinforcing steel main body has a peripheral wall portion surrounding an internal space centered on an axis extending in the longitudinal direction, and the dynamic vibration absorbing device may be provided on the peripheral wall portion within the internal space.

[0070] A seventh invention is the floor structure according to the sixth invention, wherein the height dimension of the reinforcing steel body in a vertical direction perpendicular to the longitudinal direction of the peripheral wall portion is set to a value smaller than the height dimension of the hollow portion in the vertical direction. In this case, when the reinforcing steel body is fixed to the hollow portion upper surface facing downward on the inner surface of the hollow portion, a gap is formed between the hollow portion upper surface and the opposing hollow portion lower surface on the inner surface of the hollow portion.

[0071] An eighth invention is a floor structure relating to the sixth or seventh invention, wherein the peripheral wall portion may have an upper peripheral wall piece that covers the internal space from above and is fixed to the upper surface of the hollow portion facing downward on the inner surface of the hollow portion, and a lower peripheral wall piece that covers the internal space from below and is attached to the upper peripheral wall piece, to which the elastic member is fixed. [Explanation of symbols]

[0072] 1 floor structure 2 Floor body 21 Floor Panel 211 Hollow part 2111 Hollow part top surface 2112 Hollow bottom surface 22 Notch 3 Reinforcement steel for floors 4 Reinforcement steel body 41 Peripheral wall section 411 Upper peripheral wall piece 412 Lower peripheral wall piece 5 Dynamic vibration absorber 51 Dynamic vibration absorber 511 Elastic members 512 Weight member

Claims

1. A floor structure of a building, comprising: A floor panel having a hollow portion extending in a predetermined longitudinal direction; A floor reinforcing steel material is inserted into the hollow portion, The floor reinforcing steel material is A reinforcing steel body extending in the longitudinal direction within the hollow portion; a dynamic vibration absorbing device including a dynamic vibration absorber having an elastic member fixed to the reinforcing steel body and a weight member extending in the longitudinal direction and supported by the elastic member, The reinforcing steel body is fixed to the inner surface of the hollow portion, the floor panel has a one-side end region that is set within a predetermined range in the longitudinal direction from one end face in the longitudinal direction and allows for the formation of a notch portion; A floor structure, wherein the reinforcing steel body is provided in an area within the hollow portion other than the area of ​​the one end portion in the longitudinal direction.

2. the floor panel has an other-side end region that is set within a predetermined range in the longitudinal direction from the other end face in the longitudinal direction and that allows for the formation of a notch portion; 2. The floor structure according to claim 1, wherein the reinforcing steel body is provided in an area other than the one end area and the other end area in the longitudinal direction within the hollow portion.

3. 2. The floor structure according to claim 1, wherein the dynamic vibration absorbing device includes one or more dynamic vibration absorbers depending on the longitudinal length dimension of the reinforcing steel body corresponding to the longitudinal length dimension of the floor panel.

4. The floor structure according to any one of claims 1 to 3, wherein the reinforcing steel body is inserted into the hollow portion and fixed to an upper surface of the hollow portion facing downward on the inner surface of the hollow portion.

5. The reinforcing steel body has a peripheral wall portion surrounding an internal space centered on an axis extending in the longitudinal direction, The floor structure according to claim 1 , wherein the dynamic vibration absorbing device is provided on the peripheral wall portion within the internal space.

6. A floor structure of a building, comprising: A floor panel having a hollow portion extending in a predetermined longitudinal direction; A floor reinforcing steel material is inserted into the hollow portion, The floor reinforcing steel material is A reinforcing steel body extending in the longitudinal direction within the hollow portion; a dynamic vibration absorbing device including a dynamic vibration absorber having an elastic member fixed to the reinforcing steel body and a weight member extending in the longitudinal direction and supported by the elastic member, The reinforcing steel body is fixed to an inner surface of the hollow portion and has a peripheral wall portion surrounding an internal space about an axis extending in the longitudinal direction, The dynamic vibration absorbing device is provided on the peripheral wall portion in the internal space, The reinforcing steel body is a height dimension of the peripheral wall portion along a vertical direction perpendicular to the longitudinal direction is set to a value smaller than a height dimension of the hollow portion along the vertical direction, A floor structure in which, when fixed to a hollow portion upper surface facing downward on the inner surface of the hollow portion, a gap is formed between the hollow portion upper surface and the opposing hollow portion lower surface on the inner surface of the hollow portion.

7. A floor structure of a building, comprising: A floor panel having a hollow portion extending in a predetermined longitudinal direction; A floor reinforcing steel material is inserted into the hollow portion, The floor reinforcing steel material is A reinforcing steel body extending in the longitudinal direction within the hollow portion; a dynamic vibration absorbing device including a dynamic vibration absorber having an elastic member fixed to the reinforcing steel body and a weight member extending in the longitudinal direction and supported by the elastic member, The reinforcing steel body is fixed to an inner surface of the hollow portion and has a peripheral wall portion surrounding an internal space about an axis extending in the longitudinal direction, The dynamic vibration absorbing device is provided on the peripheral wall portion in the internal space, The peripheral wall portion is An upper peripheral wall piece that covers the internal space from above and is fixed to an upper surface of the hollow portion that faces downward on the inner surface of the hollow portion; A floor structure having a lower peripheral wall piece that covers the internal space from below and is attached to the upper peripheral wall piece, and to which the elastic member is fixed.

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