Joint structure

Abstract

To provide a joint structure capable of securing noise insulation and earthquake resistance of nonstructural members constituting a building.SOLUTION: A joint structure 100 is provided with: a bracket 120 provided on a beam 30 of a building 10; a three-direction rubber vibration insulator 200 provided on the bracket 120 and exhibiting a vibration insulation effect in a vertical direction; a vibration isolation beam 130 suspended over the three-direction rubber vibration insulator 200; a ceiling frame structure 110 with an upper end part 115 of a vertical member 114 connected to the vibration isolation beam 130 and a ceiling member 28 arranged on a lower end part; and a horizontal-direction rubber vibration insulator 300 movably attaching an end part 117 of a horizontal member 116 of a lower part 1113 of the ceiling frame structure 110 to a lower side part than the three-direction rubber vibration insulator 200 of a bearing wall 24 and exhibiting a vibration insulation effect.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a joining structure for joining structural members and non-structural members that make up a building.

Background Art

[0002] Patent Document 1 discloses a technique related to a connection structure for interconnecting a structure and a non-structure. In this prior art, a bolt that interconnects the structure and the non-structure and suppresses fluctuations in the relative position of the non-structure with respect to the structure in a plane orthogonal to the connection direction, and a vibration isolation rubber that contacts both the structure and the non-structure and suppresses the transmission of vibration from the structure to the non-structure are provided.

[0003] Patent Document 2 discloses a technique related to a ceiling support structure for supporting a ceiling structure. In this prior art, a non-suspended support portion that is coupled to a building body and behaves together with the building body supports the ceiling structure. An anti-vibration mechanism for transmitting a vertical load through an anti-vibration rubber is provided between the support portion and the ceiling structure. The anti-vibration mechanism includes an anti-vibration rubber and a horizontal displacement stopper provided on the support portion side in a state where it can abut from the horizontal direction.

[0004] Patent Document 3 discloses a technique related to a ceiling structure. In this prior art, a suspended ceiling structure includes a suspension member having an anti-vibration means for insulating vertical vibration, suspended from a building body, a ceiling board suspended by the suspension member, a support member fixed to the building body and extending downward, having restraint forces in the horizontal and vertical directions, an overhanging member fixed to the support member, overhanging in a direction intersecting the vertical vibration direction, and having a bending rigidity such that it does not inhibit the vertical vibration insulation function of the anti-vibration means, and a connecting member for connecting the overhanging member and the ceiling board.

[0005] Patent Document 4 discloses technology relating to a vibration damping member provided between the structural frame and the ceiling of a building to suppress the shaking of the ceiling relative to the structural frame, and a ceiling structure equipped therewith. In this prior art, the ceiling surface material is suspended from the structural frame of the building using a suspension structure. A vibration damping member is provided between the structural frame and the ceiling to suppress the shaking of the ceiling relative to the structural frame. The vibration damping member is formed in the shape of a leaf spring and comprises a first vibration damping part that is elastically deformable in a predetermined first direction, and a second vibration damping part and a non-opposing part that are elastically deformable in a second direction perpendicular to the first direction. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2018-66126 [Patent Document 2] Japanese Patent Publication No. 2018-199951 [Patent Document 3] Japanese Patent Publication No. 2015-175120 [Patent Document 4] Japanese Patent Publication No. 2019-173375 [Overview of the project] [Problems that the invention aims to solve]

[0007] For example, while conventional suspension structures that support non-structural members by suspending them easily ensure sound insulation, they often have difficulty ensuring earthquake resistance because the horizontal rigidity of the non-structural members is low.

[0008] In view of the above, the present invention aims to ensure both sound insulation and seismic resistance of non-structural members constituting a building. [Means for solving the problem]

[0009] The first embodiment is a joint structure comprising: an attachment member provided on a structural member of a building; a first vibration-damping member provided on the attachment member and exhibiting a vibration-damping effect in the vertical direction; a connecting member stretched over the first vibration-damping member; a non-structural member whose upper part is joined to the connecting member and suspended; and a second vibration-damping member attached to the lower part of the non-structural member at a portion of the structural member below the first vibration-damping member so as to be movable in the vertical direction and exhibiting a vibration-damping effect in the horizontal direction.

[0010] In the first embodiment of the joint structure, the upper part of the non-structural member is joined to a connecting member that spans across a first vibration-damping member, which is attached to a mounting member provided on the structural member of the building. The lower part of the non-structural member is attached to the structural member at a point lower than the first vibration-damping member by a second vibration-damping member. Vertical solid-borne sound transmitted from the non-structural member to the structural member is blocked or attenuated by the first vibration-damping member, which exerts a vibration-damping effect in the vertical direction. The second vibration-damping member is attached to the structural member so that the lower part of the non-structural member can move vertically, and therefore does not interfere with the vertical vibration-damping effect of the first vibration-damping member. Furthermore, horizontal displacement of the non-structural member is damped by the second damping member, which exerts a vibration-damping effect in the horizontal direction; that is, horizontal displacement and acceleration are reduced, so the horizontal rigidity of the non-structural member is ensured. Therefore, both sound insulation and seismic resistance of the non-structural members constituting the building are ensured.

[0011] The second embodiment is a joint structure according to the first embodiment, wherein the first vibration-damping member is a three-way vibration-damping rubber that exhibits vibration-damping effects in the vertical and shear directions, and the second vibration-damping member is a horizontal vibration-damping rubber that exhibits vibration-damping effects in the horizontal direction.

[0012] In the second embodiment of the joint structure, the three-way vibration-damping rubber exhibits vibration-damping effects in the vertical and shear directions, further improving shear rigidity, i.e., horizontal rigidity. Therefore, the seismic resistance of the non-structural members is improved. Furthermore, since both the first and second vibration-damping members exert vibration-damping effects through rubber, the mechanism is simpler than, for example, the case where vibration-damping effects are exerted through coil springs.

[0013] The third embodiment is a joint structure according to the first or second embodiment, wherein the non-structural member is a ceiling frame with a ceiling material provided at its lower end, the mounting member is provided on a beam constituting the structural member, and the second vibration-damping member is attached to the lower part of the ceiling frame to a wall constituting the structural member.

[0014] In the third embodiment of the joint structure, the gap between the ceiling material and the wall at the lower end of the ceiling frame can be reduced, thus ensuring sound insulation. [Effects of the Invention]

[0015] According to the present invention, both sound insulation and seismic resistance can be ensured for non-structural members that make up a building. [Brief explanation of the drawing]

[0016] [Figure 1] This is a schematic longitudinal cross-sectional view showing a cross-section of a building according to one embodiment of the present invention, along the X direction. [Figure 2] This is a longitudinal cross-sectional view of the upper part of the ceiling frame of the building shown in Figure 1. [Figure 3] Figure 2 is a partial cross-sectional view showing a portion of the main part. [Figure 4] This is a longitudinal cross-sectional view of the lower part of the main section of the ceiling frame of the building shown in Figure 1. [Figure 5] (A) is a longitudinal cross-sectional view of the main part of Figure 2, and (B) is a horizontal cross-sectional view of the horizontal vibration-damping rubber of (A). [Modes for carrying out the invention]

[0017] <Embodiment> First, the basic concept of this embodiment will be described. This embodiment relates to a joining structure for joining structural members and non-structural members that make up a building. Here, a "structural member" is a structural member that structurally supports a building, or in other words, the building's framework. Specifically, it includes columns (main columns, intermediate columns, etc.), beams (main beams, secondary beams, wind-resistant beams, etc.), shear walls, and slabs, etc. A "non-structural member" is a part other than the structural members that make up a building, for example, ceiling materials, ceiling frameworks, floor materials, and walls other than shear walls (exterior walls, interior walls, partition walls, etc.).

[0018] Note that two orthogonal horizontal directions are defined as the X direction and the Y direction, respectively, and are indicated by arrow X and arrow Y. The vertical direction orthogonal to the X direction and the Y direction is defined as the Z direction and is indicated by arrow Z.

[0019] [Specific Structure] Next, the specific structure of the joining structure of this embodiment will be described.

[0020] (Overall Structure) First, the overall structure will be described.

[0021] As shown in FIG. 1, the joining structure 100 of this embodiment joins a structural member 15 that makes up a building 10 and a ceiling framework 110 as an example of a non-structural member. In this embodiment, the structural member 15 is composed of a slab 20 on the rooftop floor, a beam 30 that supports this slab 20, a slab 22 on the first floor, and a shear wall 24. A ceiling material 28, which is a finishing material, is provided at the lower end portion 112 of the ceiling framework 110. Thus, the ceiling material 28 is provided on the ceiling framework 110 and is not a suspended ceiling suspended from the slab 22 or the like by suspension bolts or the like. Also, a floor material 26 is provided on the slab 22 on the first floor. The large space formed by the ceiling material 28, the floor material 26, and the shear wall 24 is used as a music hall 18.

[0022] Also, in this embodiment, the ceiling framework 110 and the beam 30 are made of steel, and the slabs 20, 22, and the shear wall 24 are made of reinforced concrete, but it is not limited to this.

[0023] The joint structure 100 of this embodiment is composed of a bracket 120 as an example of a mounting member, a vibration-damping beam 130 as an example of a connecting member, a three-way vibration-damping rubber 200 as an example of a first vibration-damping member, a horizontal vibration-damping rubber 300 as an example of a second vibration-damping member, and a steel-framed ceiling structure 110.

[0024] The ceiling frame 110 is constructed by joining vertical members 114 and horizontal members 116. In this embodiment, the horizontal members 116 are joined in a grid pattern in plan view, and horizontal braces (not shown) are joined between the joints of the horizontal members 116 and the vertical members 114. However, the horizontal braces do not necessarily have to be joined. In this embodiment, the vertical members 114 and the horizontal members 116 are made of H-shaped steel, but the embodiment is not limited to this.

[0025] As shown in Figures 1 and 2, the beams 30 supporting the slab 20 are arranged along the Y direction and spaced apart in the X direction. In this embodiment, the beams 30 are made of H-shaped steel, but are not limited to this. Similarly, the vibration-damping beams 130 are also made of H-shaped steel, but are not limited to this.

[0026] As shown in Figure 2, the bracket 120 in this embodiment has a T-shaped cross-section composed of a steel flange portion 122 and a vertical rib 124. Note that the configuration of the bracket 120 is an example and is not limited to this. The bracket 120 is joined to the lower flange 32 of the beam 30. The bracket 120 is joined to multiple locations at intervals in the Y-direction, which is the longitudinal direction of the beam 30. Furthermore, in this embodiment, internal beam ribs 34 are provided at the joint locations of the bracket 120 on the beam 30.

[0027] As shown in Figures 1 and 2, a three-way vibration-damping rubber 200 is provided on each bracket 120. A vibration-damping beam 130 is stretched across adjacent three-way vibration-damping rubbers 200 in the X direction. As mentioned above, the brackets 120 are provided at multiple locations with intervals in the longitudinal direction of each beam 30, and a three-way vibration-damping rubber 200 is provided on each bracket 120. Therefore, the vibration-damping beams 130 are provided with intervals in the Y direction. The upper end 115 of the vertical member 114 of the ceiling frame 110 is joined to each vibration-damping beam 130.

[0028] As shown in Figures 1 and 4, the ends 117 of the horizontal members 116 in the lower part 113 of the ceiling frame 110 are attached by horizontal vibration-damping rubber 300 to a portion of the load-bearing wall 24 that is lower than the beam 30 (see Figure 1). The lower part 113 of the ceiling frame 110 is attached by horizontal vibration-damping rubber 300 at intervals in the Y direction. Similarly, the ends 117 of the horizontal members 116 in the lower part 113 of the ceiling frame 110 are also attached by horizontal vibration-damping rubber 300 to the load-bearing wall 24 along the X direction (not shown).

[0029] (Three-way vibration-damping rubber) Next, the structure of the three-way vibration-damping rubber 200 and its mounting structure will be described. Note that the structure of the three-way vibration-damping rubber 200 and its mounting structure described below are examples only and are not limited to these.

[0030] As shown in Figure 3, the three-way vibration-damping rubber 200 is a vibration-damping rubber that exhibits vibration-damping effects in the vertical and shear directions, and vibrationally supports the ceiling frame 110 on the beam 30 that constitutes the structural member 15, and insulates it from the structural member 15 (see also Figures 1 and 2).

[0031] The three-way vibration-damping rubber 200 of this embodiment has an upper fitting 210 and a lower fitting 230, with a rubber portion 250 provided between the upper fitting 210 and the lower fitting 230. A shaft portion 212 is provided in the center of the upper fitting 210. The lower part 213 of the shaft portion 212 is embedded in the rubber portion 250, and a disc portion 214 is formed at its lower end.

[0032] The lower fitting 230 has an overhanging portion 232 that extends in the X direction in the figure, and a bolt hole 233 is formed in the overhanging portion 232. The inner end portion 234 of the lower fitting 230 is embedded in the rubber portion 250, and after curving upward, extends inward to form an extension portion 235. The extension portion 235 is positioned above the disc portion 214 of the upper fitting 210 within the rubber portion 250.

[0033] The three-way vibration-damping rubber 200 is bolted to the bracket 120 by bolts 290 and nuts 292 that are inserted through bolt holes 233 in the protruding portion 232 of the lower fitting 230 and bolt holes 121 in the flange portion 122 of the bracket 120.

[0034] Furthermore, the three-way vibration-damping rubber 200 is fastened to the vibration-damping beam 130 by nuts 292, with the upper part 211 of the shaft portion 212 of the upper fitting 210 being inserted through the lower flange 132 of the vibration-damping beam 130.

[0035] (Horizontal vibration damping rubber) Next, the structure of the horizontal vibration-damping rubber 300 and its mounting structure will be described. Note that the structure of the horizontal vibration-damping rubber 300 and its mounting structure described below are examples only and are not limited to these.

[0036] As shown in Figure 5(A), the horizontal vibration-damping rubber 300 is a vibration-damping rubber that provides vibration damping in the horizontal direction while attaching the lower part 113 of the ceiling frame 110 to the load-bearing wall 24 that constitutes the structural member 15 so that it can move freely in the vertical direction (see also Figures 1 and 4).

[0037] The horizontal vibration-damping rubber 300 is composed of an outer frame portion 310, a core rod portion 330, and an inner frame portion 350. The outer frame portion 310 is horizontally U-shaped (or U-shaped) with an upper plate portion 312 and a lower plate portion 314 extending from the upper and lower ends of a vertical plate portion 316. The core rod portion 330 and the inner frame portion 350 are arranged between the upper and lower plate portions 312 and 314 of the outer frame portion 310.

[0038] As shown in Figures 5(A) and 5(B), the core rod portion 330 is made of a steel pipe with a rectangular cross-section. In addition, multiple horizontal plate portions 334 are provided within the core rod portion 330 at intervals in the vertical direction.

[0039] A bolt 390 passes through the upper and lower plates 312 and 314 of the outer frame 310, and through the core rod 330, and the core rod 330 is fixed to the outer frame 310 by the bolt 390 and nut 392.

[0040] The inner frame portion 350 is made of a steel pipe with a rectangular cross-section. The aforementioned core rod portion 330 is provided inside the inner frame portion 350. The vertical length of the inner frame portion 350 is smaller than the distance between the upper plate portion 312 and the lower plate portion 314 of the outer frame portion 310. A rubber material 370 is joined to the inner wall surface 352 of the inner frame portion 350. A gap is formed between the rubber material 370 and the outer wall surface 332 of the core rod portion 330. In addition, the vertical length of the rubber material 370 is longer than the vertical length of the inner frame portion 350, but smaller than the distance between the upper plate portion 312 and the lower plate portion 314.

[0041] Therefore, the inner frame portion 350 can move freely in the vertical direction relative to the outer frame portion 310, within the range of the gap between the upper and lower ends of the rubber material 370 (in this example) and the upper and lower plate portions 312 and 314. The rubber material 370 is joined to the inner wall surface 352 of the inner frame portion 350, but is not joined to the outer wall surface 332 of the core rod portion 330, and a gap is formed between them. Therefore, the rubber material 370 does not hinder the vertical movement of the inner frame portion 350. Furthermore, the inner frame portion 350's horizontal movement is restricted and a vibration damping effect is achieved when the rubber material 370 contacts the outer wall surface 332 of the core rod portion 330 relative to the outer frame portion 310.

[0042] The horizontal vibration-damping rubber 300 has a wall-side mounting plate 360 ​​joined to the vertical plate portion 316 of the outer frame portion 310. The wall-side mounting plate 360 ​​is fixed to the load-bearing wall 24 by post-installed anchors 294. The horizontal vibration-damping rubber 300 is also joined to the horizontal member 116 by a vibration-damping rubber side plate 361 and a ceiling frame side plate 362, whose plate thickness direction is oriented vertically. Specifically, the vibration-damping rubber side plate 361 is joined to the inner frame portion 350, and the ceiling frame side plate 362 is joined to the end plate 111 of the horizontal member 116. The vibration-damping rubber side plate 361 and the ceiling frame side plate 362 are then stacked vertically and bolted together.

[0043] With this structure and mounting structure of the horizontal vibration-damping rubber 300, the ceiling frame 110 can move freely in the vertical direction relative to the load-bearing wall 24, within the range of the distance between the upper and lower ends of the inner frame portion 350 of the horizontal vibration-damping rubber 300 and the upper plate portion 312 and the lower plate portion 314. Furthermore, when the inner frame portion 350 of the horizontal vibration-damping rubber 300 comes into contact with the outer wall surface 332 of the core rod portion 330, the horizontal movement of the ceiling frame 110 is restricted, and the vibration-damping effect is achieved as the rubber material 370 elastically deforms.

[0044] [Mechanism of Action and Effects] Next, the operation and effects of this embodiment will be described.

[0045] The upper end 115 of the vertical member 114 of the ceiling frame 110 is joined to a vibration-damping beam 130 which is stretched across a three-way vibration-damping rubber 200 on a bracket 120 provided on the beam 30. In addition, the end 117 of the horizontal member 116 of the lower part 113 of the ceiling frame 110 is attached to the load-bearing wall 24 below the three-way vibration-damping rubber 200 by a horizontal vibration-damping rubber 300. The horizontal vibration-damping rubber 300 attaches the lower part 113 of the ceiling frame 110 to the load-bearing wall 24 so that it can move vertically.

[0046] Therefore, the ceiling frame 110 is suspended from the beam 30 via vibration-damping beams 130, brackets 120, and three-way vibration-damping rubber 200, similar to a suspended ceiling, and the beam 30 supports all of the vertical load of the ceiling frame 110.

[0047] Therefore, vertical solid-borne sound transmitted from the ceiling frame 110 to the beam 30 is blocked or attenuated by the elastic deformation of the rubber portion 250 of the three-way vibration-damping rubber 200. Furthermore, since the horizontal vibration-damping rubber 300 is attached to the load-bearing wall 24 so as to be vertically movable at the lower part 113 of the ceiling frame 110, it does not interfere with the vertical vibration-damping effect of the three-way vibration-damping rubber 200.

[0048] Furthermore, during earthquakes and other events, the horizontal displacement of the ceiling frame 110 is reduced by the horizontal vibration-damping rubber 300, which exhibits a vibration-damping effect in the horizontal direction. In other words, the horizontal displacement and acceleration are reduced by the elastic deformation of the rubber material 370, thus ensuring the horizontal rigidity of the ceiling frame 110.

[0049] Thus, the joint structure 100 of this embodiment ensures both sound insulation and seismic resistance of the ceiling frame 110. In other words, it is possible to satisfy the conflicting requirements of being flexible in the vertical direction (sound insulation) and rigid in the horizontal direction (seismic resistance).

[0050] Furthermore, since the three-way vibration-damping rubber 200 exhibits vibration-damping effects in the vertical and shear directions, the rigidity in the shear direction is increased, that is, the horizontal rigidity of the ceiling frame 110 is improved. Therefore, the seismic resistance of the ceiling frame 110 is further improved.

[0051] Furthermore, since both the three-way vibration-damping rubber 200 and the horizontal vibration-damping rubber 300 exert their vibration-damping effect through the elastic deformation of the rubber, the mechanism is simpler than, for example, the case where a coil spring is used to exert a vibration-damping effect.

[0052] Furthermore, since the gap between the ceiling material 28 and the load-bearing wall 24, which is provided at the lower end of the ceiling frame 110, can be reduced, sound insulation is ensured.

[0053] From another perspective, the joint structure 100 of this embodiment makes it possible to ensure sound insulation performance approximately equivalent to that of a vibration-damping suspended ceiling (specified ceiling) while ensuring seismic resistance approximately equivalent to that of a straight ceiling (rigid ceiling). Furthermore, the joint structure 100 makes it possible to treat it as a straight ceiling (rigid ceiling) rather than a suspended ceiling (specified ceiling), which involves complex administrative procedures and structural calculations.

[0054] As mentioned above, the joint structure 100 of this embodiment ensures both sound insulation and seismic resistance of the ceiling frame 110. In this embodiment, sound insulation is ensured by setting the vertical natural frequency of the ceiling frame 110 to 10 Hz or less (natural period of 0.1 seconds or less). Seismic resistance is ensured by setting the horizontal natural frequency of the ceiling frame 110 to 10 Hz or more (natural period of 0.1 seconds or less). However, these values ​​are not the only ones that are considered.

[0055] <Other> Furthermore, the present invention is not limited to the embodiments described above.

[0056] For example, in the above embodiment, the three-directional vibration-damping rubber 200 as an example of the first vibration-damping member and the horizontal vibration-damping rubber 300 as an example of the second vibration-damping member both exhibited vibration-damping effects through the elastic deformation of the rubber, but the invention is not limited to this. The first vibration-damping member and the second vibration-damping member may also be vibration-damping members using elastic materials other than rubber, such as coil springs or disc springs.

[0057] Furthermore, in the above embodiment, for example, a bracket 120 as an example of a mounting member was provided on the beam 30 of the building 10 and the second vibration-damping member was fixed to the load-bearing wall 24, but the invention is not limited to this. For example, a mounting member may be provided on the slab, or the second vibration-damping member may be fixed to the column.

[0058] Furthermore, the present invention can be implemented in various forms without departing from the spirit of the invention. [Explanation of Symbols]

[0059] 10 Buildings 15 Structural members 24 Load-bearing walls 28 Ceiling materials 30 Beam 100 joint structure 110 Ceiling frame 112 Lower end 113 Lower part 120 Bracket (Example of mounting material) 130 Vibration-isolating beam (an example of a crossbeam) 200 Three-way vibration-damping rubber (an example of the first vibration-damping component) 300 Horizontal vibration-damping rubber (an example of a second vibration-damping component)

Claims

1. Mounting materials attached to structural members of a building, A first vibration-damping member is provided on the aforementioned mounting material and exhibits a vibration-damping effect in the vertical direction, A bridging member stretched over the first vibration-damping member, A ceiling frame is provided at the lower end, and its upper part is joined to the aforementioned connecting member and suspended. A second vibration-damping member is provided, which is attached to the lower part of the ceiling frame so as to be vertically movable at a portion of the structural member below the first vibration-damping member, and which exhibits a vibration-damping effect in the horizontal direction. A joint structure equipped with [the following features].

2. The first vibration-damping member is a three-way vibration-damping rubber that exhibits vibration-damping effects in the vertical and shear directions. The second vibration-damping member is a horizontal vibration-damping rubber that exhibits vibration-damping effects in the horizontal direction. The joining structure according to claim 1.

3. The mounting member is provided on the beam constituting the structural member, The second vibration-damping member is attached to the lower part of the ceiling frame to the wall that constitutes the structural member. The joining structure according to claim 1 or claim 2.

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