Lightweight floor structure

Abstract

This provides a lightweight floor structure that can quickly dampen floor vibrations and easily secure underfloor space. [Solution] The lightweight floor structure 1 in the embodiment is a lightweight floor structure 1 in a building having a lower floor and an upper floor, and is characterized by comprising: a floor plate 2 of the upper floor; a plurality of underfloor support members 3 that are erected below the floor plate 2 and support the floor plate 2; a connecting member 6 fixed to the lower surface of the underfloor support members 3 and erected on the plurality of underfloor support members 3; a ceiling portion 5 of the lower floor that is spaced apart below the connecting member 6; and a connecting member 4 that joins the connecting member 6 and the ceiling portion 5 so that they can be displaced relative to each other in the vertical direction.

Description

Technical Field

[0001] The present invention relates to a lightweight floor structure in a building having a lower floor portion and an upper floor portion.

Background Art

[0002] In lightweight floors of wooden or lightweight steel frame construction, unpleasant vibrations are likely to occur at the low impact force of the footstep level during walking, compared to a heavyweight floor of concrete construction. In particular, in offices, classrooms, etc. where many people walk, desk workers may feel uncomfortable with the walking of people passing nearby, and it is required to suppress vibrations. As technologies for suppressing vibrations in a floor structure, for example, Patent Documents 1 and 2 are disclosed.

[0003] The floor structure of Patent Document 1 is characterized in that a connecting member for connecting adjacent floor joists and suppressing relative displacement in the vertical direction orthogonal to the floor surface of those floor joists is attached to the opposing side surfaces of the adjacent floor joists.

[0004] The floor structure of Patent Document 2 is characterized in that a splicing plate for connecting adjacent floor joists is fixed to the lower end surfaces of those floor joists.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] The disclosed technology of Patent Document 1 attaches a connecting member to the side surface of a floor joist. Therefore, with the disclosed technology of Patent Document 1, the under-floor space on the side of the floor joist cannot be utilized, and piping such as wiring and air-conditioning ducts cannot be passed through the under-floor space. Further, since the interval between floor joists is narrow, the installation work of the connecting member is also difficult.

[0007] The technology disclosed in Patent Document 2 involves fixing a connecting plate to the lower end surface of a floor joist. Since the connecting plate covers the lower end surfaces of two floor joists, the underfloor space above the connecting plate cannot be utilized. Furthermore, since the connecting plate is only for joining two floor joists, it cannot connect three or more floor joists.

[0008] As shown in Figure 12, in a conventional floor structure 91, horizontal members 93 supporting the floorboards 92 of the upper floor, such as secondary beams and joists, are installed on main beams 97 that are erected on columns (not shown). In a conventional floor structure 91, in order to suppress the transmission of vibrations from the floorboards 92 to the ceiling 95 of the lower floor, ceiling joists 98 separate from the horizontal members 93 are installed, and the ceiling 95 of the lower floor is suspended from the ceiling joists 98. This structurally separates the floorboards 92 and the ceiling 95, suppressing the transmission of vibrations from the floorboards 92 to the ceiling 95 of the lower floor. However, in a conventional floor structure 91, since the ceiling joists 98 are installed in the space under the floorboards 92, it becomes difficult to install wiring, air conditioning ducts, and other piping in this space under the floor.

[0009] Therefore, the present invention was devised in view of the above circumstances, and its objective is to provide a lightweight floor structure that can dampen floor vibrations early and easily secure underfloor space. [Means for solving the problem]

[0010] The lightweight floor structure according to the present invention is a lightweight floor structure for a building having a lower floor and an upper floor, and is characterized by comprising: a floor plate of the upper floor; a plurality of underfloor support members erected below the floor plate and supporting the floor plate; connecting members fixed to the lower surface of the underfloor support members and erected on the plurality of underfloor support members; a ceiling portion of the lower floor arranged spaced apart below the connecting members; and a joining member that connects the connecting members and the ceiling portion so as to be able to move relative to each other in the vertical direction. [Effects of the Invention]

[0011] According to the present invention, a connecting member is provided to join the connecting member and the ceiling portion so that they can be relatively displaced in the vertical direction. As a result, when an impact force acts on the floor plate and the floor plate, underfloor support member and connecting member vibrate vertically, the ceiling portion, which is joined by the connecting member so that it can be relatively displaced, attempts to maintain a stationary state or a state of free fall due to gravity, and an inertial force in the opposite direction to the displacement direction of the underfloor support member and connecting member is repeatedly acted on the ceiling portion. As a result, the vibration of the floor plate is disturbed, and this vibration can be dampened at an early stage.

[0012] According to the present invention, a connecting member is provided that joins the connecting member and the ceiling portion so that they can be displaced relative to each other in the vertical direction. This eliminates the need for ceiling joists, which were used in conventional floor structures to suspend the ceiling. Furthermore, since the connecting member is attached to the underside of the underfloor frame member, the underfloor space on the side of the underfloor frame member can be utilized. This makes it easier to secure underfloor space for installing wiring, air conditioning ducts, and other piping.

[0013] In particular, according to the present invention, underfloor support members are connected to each other by connecting members. Therefore, a load acting on one underfloor support member is transmitted to other adjacent underfloor support members via the connecting members. That is, the area of ​​displacement of the floorboard expands planarly, and multiple underfloor support members are displaced. Then, due to the connecting members, an inertial force in the opposite direction to the displacement direction of the floorboard, underfloor support members, and connecting members is repeatedly acted on the ceiling. As a result, initial vibrations of the floorboard can be suppressed, and floor vibrations can be dampened early. [Brief explanation of the drawing]

[0014] [Figure 1] Figure 1 shows a lightweight floor structure in the first embodiment. [Figure 2] Figure 2 is a cross-sectional view of the lightweight floor structure in the first embodiment, cut by a plane perpendicular to the first plane direction. [Figure 3] Figure 3 is a cross-sectional view of the underfloor support member of the lightweight floor structure in the first embodiment, cut by a plane perpendicular to the second plane direction. [Figure 4]FIG. 4 is a cross-sectional view of the joint member of the lightweight floor structure in the first embodiment taken along a plane orthogonal to the second planar direction. [Figure 5] FIG. 5 is a cross-sectional view of the vicinity of the end of the connecting member of the lightweight floor structure in the first embodiment taken along a plane orthogonal to the first planar direction. [Figure 6] FIG. 6 shows an example of the lightweight floor structure in the first embodiment. FIG. 6(a) is a view showing the state before the impact force acts, FIG. 6(b) is a view showing the state when the floor board is displaced downward, and FIG. 6(c) is a view showing the state when the floor board is displaced upward. [Figure 7] FIG. 7 is a cross-sectional view of the lightweight floor structure in the second embodiment taken along a plane orthogonal to the second planar direction. [Figure 8] FIG. 8(a) is a cross-sectional view of the lightweight floor structure in the third embodiment taken along a plane orthogonal to the second planar direction, and FIG. 8(b) is a cross-sectional view of the lightweight floor structure in the fourth embodiment taken along a plane orthogonal to the second planar direction. [Figure 9] FIG. 9(a) is a cross-sectional view of the lightweight floor structure in the fifth embodiment taken along a plane orthogonal to the second planar direction, and FIG. 9(b) is a cross-sectional view of the lightweight floor structure in the sixth embodiment taken along a plane orthogonal to the second planar direction. [Figure 10] FIG. 10 is a view of the lightweight floor structure in the seventh embodiment as seen from below. [Figure 11] FIG. 11 shows the results of the ball drop test of the examples. FIG. 11(a) is a view showing the time history of the displacement of Comparative Example 1 and Comparative Example 2, and FIG. 11(b) is a view showing the time history of the displacement of Invention Example 1 and Comparative Example 1. [Figure 12] FIG. 12 is a view showing an example of a conventional floor structure.

MODE FOR CARRYING OUT THE INVENTION

[0015] Hereinafter, a mode for implementing a lightweight floor structure to which the present invention is applied will be described in detail with reference to the drawings. Hereinafter, the extending direction of the floor underlaying member 3 is defined as the first plane direction X, the direction intersecting the first plane direction X is defined as the second plane direction Y, and the direction intersecting the first plane direction X and the second plane direction Y is defined as the height direction Z.

[0016] <First Embodiment> As shown in FIG. 1, the lightweight floor structure 1 is a lightweight floor structure in a building having a lower floor portion and an upper floor portion. The lightweight floor structure 1 is a dry floor structure such as a wooden structure or a lightweight steel frame structure that is configured without placing concrete. The lightweight floor structure 1 includes a floor slab 2 of the upper floor portion, a plurality of floor underlaying members 3, joining members 4, a ceiling portion 5 of the lower floor portion, connecting members 6, and a large beam 7. The large beam 7 is installed on columns (not shown). The large beam 7 is arranged in a grid pattern.

[0017] The floor slab 2 is, for example, a wooden surface material such as plywood, a cement surface material such as wood chip cement board, or a steel plate surface material such as a deck plate. The combined mass of the floor slab 2, the floor underlaying member 3, and the floor finishing material is, for example, 700 to 1500 N / m and is composed of.

[0018] The floor underlaying member 3 is installed below the floor slab 2. The floor underlaying member 3 is at least one of a joist and a purlin and supports the floor slab 2. The floor underlaying member 3 is installed on a pair of large beams 7. The floor underlaying member 3 is made of lightweight steel. The floor underlaying member 3 may be made of wood.

[0019] As shown in FIG. 2, for the floor underlaying member 3, for example, a steel section having an I-shaped cross section is used. The floor underlaying member 3 has an upper flange 31, a lower flange 32, and a web 33. The upper flange 31 is where the floor slab 2 is placed. The lower flange 32 is where the connecting member 6 is joined. The web 33 connects the upper flange 31 and the lower flange 32. The floor underlaying member 3 extends in the first plane direction X. The floor underlaying members 3 are arranged at a plurality of predetermined intervals in the second plane direction Y.

[0020] The connecting member 6 is fixed to the underside of the underfloor erection member 3 by fasteners 8. The connecting member 6 is installed on all underfloor erection members 3 that support the floor plate 2. The connecting member 6 extends in a second plane direction Y that intersects the first plane direction X. For example, channel steel is used for the connecting member 6. The connecting member 6 may also be hat-shaped steel or a flat plate. The connecting member 6 has a through hole 43a in which the extending member 42 is placed. Multiple connecting members 6 are arranged at predetermined intervals in the first plane direction X. The distance between adjacent connecting members 6 is, for example, about 910 mm.

[0021] The fasteners 8 are, for example, fasteners such as screws. The fasteners 8 are driven into the lower flange 32 of the underfloor support member 3. The fasteners 8 are arranged symmetrically with respect to the central axis C1 in the width direction of the underfloor support member 3.

[0022] As shown in Figure 3, the fastener 8 is positioned on the central axis C2 in the width direction of the connecting member 6.

[0023] As shown in Figure 5, an end fitting 61 is provided at the extension end of the connecting member 6. The end fitting 61 fixes the extension end of the connecting member 6 to the underfloor erection member 3 located at the end in the second planar direction Y via a fastener 8. For example, an L-shaped angle material can be used for the end fitting 61. The connecting member 6 connects all the underfloor erection members 3, which are spaced apart in the second planar direction Y, with a single member. The end fitting 61 may also be used to fix the main beam 7 to the connecting member 6.

[0024] As shown in Figure 2, the ceiling section 5 is positioned spaced apart below the underfloor frame member 3 and the connecting member 6. Preferably, the ceiling section 5 is composed of a weight of 5 to 20% of the weight of the floorboards 2. The ceiling section 5 is constructed, for example, by joining furring strips and ceiling surface material. The furring strips that make up the ceiling section 5 are, for example, light steel framing or wood. The ceiling surface material that makes up the ceiling section 5 is wood-based surface material such as gypsum board or plywood, or ceramic surface material such as calcium silicate board.

[0025] As shown in Figure 4, the joining member 4 connects the connecting member 6 and the ceiling portion 5 so that they can be displaced relative to each other in the vertical direction.

[0026] The displacement restricting section 41 restricts the relative displacement between the connecting member 6 and the ceiling section 5. The displacement restricting section 41 includes an extension member 42, a first flat plate 43, a first large diameter section 44, a second large diameter section 45, and a base section 47.

[0027] The extension member 42 is composed of a rod-shaped member that extends vertically. The extension member 42 is made of, for example, a fully threaded bolt, with a threaded portion formed around its circumference. A base 47 is fixed to the lower end of the extension member 42, and the base 47 is fixed to the ceiling portion 5. As a result, the extension member 42 displaces integrally with the ceiling portion 5.

[0028] The first flat plate 43 is positioned on the connecting member 6. The first flat plate 43 has a through hole 43a through which the extending member 42 passes. The first flat plate 43 is displaced integrally with the floor plate 2 and the underfloor erection member 3.

[0029] The first diameter-enlarged portion 44 is formed to be larger in diameter than the through-hole 43a of the first flat plate 43 through which the extension member 42 passes, and is positioned above the first flat plate 43. The first diameter-enlarged portion 44 is attached to the threaded portion of the extension member 42, for example, by using a nut. The first diameter-enlarged portion 44 can suspend the extension member 42 from the first flat plate 43. If the extension member 42 is a wire rope, the first diameter-enlarged portion 44 may be a wire clip or the like.

[0030] The second diameter-enlarged portion 45 is formed to be larger in diameter than the through hole 43a and is positioned on the opposite side of the first diameter-enlarged portion 44, with the first flat plate 43 in between. The second diameter-enlarged portion 45 is attached to the threaded portion of the extension member 42, for example, by using a nut. If the extension member 42 is a wire rope, the second diameter-enlarged portion 45 may be a wire clip or the like.

[0031] The distance L between the first large diameter portion 44 and the second large diameter portion 45 is greater than the thickness t of the first flat plate 43. As a result, a gap is formed between the first flat plate 43 and the second large diameter portion 45. Due to this gap, when the floor plate 2 vibrates, the first flat plate 43 and the extension member 42 are displaced relative to each other. As a result, the joining member 4 can be joined so that the ceiling portion 5 is able to be displaced vertically relative to the underfloor erection member 3 and the connecting member 6, without the ceiling portion 5 being displaced integrally with the underfloor erection member 3 and the connecting member 6.

[0032] The first diameter portion 44 restricts the relative displacement of the ceiling portion 5 with respect to the underfloor erection member 3 and the connecting member 6 by causing the first flat plate 43, which is displaced relative to the extension member 42, to collide with it. The second diameter portion 45 restricts the relative displacement of the ceiling portion 5 with respect to the underfloor erection member 3 and the connecting member 6 by causing the first flat plate 43, which is displaced relative to the extension member 42, to collide with it. Therefore, the displacement restricting portion 41 can restrict the relative displacement of the ceiling portion 5 with respect to the underfloor erection member 3 and the connecting member 6.

[0033] The length of the gap (distance L - plate thickness t) between the first flat plate 43 and the second large diameter portion 45 is preferably greater than 0 mm and less than or equal to 0.3 mm. This allows the first flat plate 43, which is displaced relative to the extending member 42, to collide with the first large diameter portion 44 and the second large diameter portion 45, thereby regulating the relative displacement of the ceiling portion 5 with respect to the underfloor erection member 3 and the connecting member 6. As a result, the vibration of the floor plate 2 is more easily disturbed, and the vibration can be further attenuated.

[0034] Furthermore, when screwing the first diameter portion 44 and the second diameter portion 45 onto the threaded portion of the extension member 42, it is preferable to tighten them by hand without using any tools. This makes it easier to secure a gap between the first flat plate 43 and the second diameter portion 45.

[0035] The base 47 is used to fix the extension member 42 and the ceiling portion 5. The base 47 is made of, for example, structural steel.

[0036] Next, the vibration damping effect in this embodiment will be explained using Figure 6.

[0037] As shown in Figure 6(a), before an impact force acts on the floor slab 2, the underfloor support member 3, the connecting member 6, and the ceiling section 5 are in a stationary state. Then, as shown in Figure 6(b), when an impact force acts on the floor slab 2, the floor slab 2 and the underfloor support member 3 are displaced downward. At this time, since the underfloor support members 3 are connected to each other by the connecting member 6, the load acting on one underfloor support member 3 is transmitted to the adjacent underfloor support member 3 via the connecting member 6. That is, the area of ​​displacement of the floor slab 2 expands planarly, and multiple underfloor support members 3 are displaced. The ceiling section 5, which is joined to the connecting member 6 by the joining member 4 so as to be able to move relative to it in the vertical direction, tries to maintain a stationary state without moving together with the connecting member 6 which is fixed to the underfloor support member 3, and an upward inertial force (in the opposite direction to the displacement direction of the underfloor support member 3 and the connecting member 6) acts on the ceiling section 5. Subsequently, the ceiling section 5 will free-fall due to gravity, with a delay compared to the downward displacement of the floorboard 2, the underfloor support member 3, and the connecting member 6.

[0038] Then, as shown in Figure 6(c), the floor plate 2, the underfloor support member 3, and the connecting member 6 vibrate when an impact force is applied, and after being displaced downward, they reverse to an upward displacement. At this time, the ceiling section 5, which is joined to the connecting member 6 by the joining member 4 so as to be able to move relative to it in the vertical direction, tries to maintain a state of free fall due to gravity without being displaced integrally with the underfloor support member 3 and the connecting member 6, and an inertial force acts downward (in the opposite direction to the displacement direction of the underfloor support member 3 and the connecting member 6) on the ceiling section 5.

[0039] In this way, the connecting member 4 causes an inertial force in the opposite direction to the displacement direction of the floor plate 2, the underfloor support member 3, and the connecting member 6 to repeatedly act on the ceiling 5. As a result, the vibration of the floor plate 2 is disturbed, and this vibration can be dampened at an early stage.

[0040] According to this embodiment, a connecting member 4 is provided to connect the connecting member 6 and the ceiling portion 5 so that they can be displaced relative to each other in the vertical direction. As a result, when an impact force acts on the floor plate 2 and the floor plate 2, the underfloor support member 3, and the connecting member 6 vibrate vertically, an inertial force acting on the ceiling portion 5 in the opposite direction to the displacement direction of the underfloor support member 3 and the connecting member 6 will act on the ceiling portion 5 in an attempt to maintain a stationary state or a state of free fall due to gravity, as the ceiling portion 5 is connected to the underfloor support member 3 and the connecting member 6 so that it can be displaced relative to each other. Based on this inertial force, the vibration of the floor plate 2 is disturbed, and this vibration can be dampened early.

[0041] Furthermore, according to this embodiment, a connecting member 4 is provided to connect the connecting member 6 and the ceiling portion 5 so that they can be displaced relative to each other in the vertical direction. This eliminates the need for ceiling joists used to suspend the ceiling in conventional floor structures. In addition, since the connecting member 6 is attached to the underside of the underfloor erection member 3, the underfloor space on the side of the underfloor erection member 3 can be utilized. This makes it easier to secure underfloor space for installing wiring, air conditioning ducts, and other piping.

[0042] In particular, according to this embodiment, the underfloor support members 3 are connected to each other by connecting members 6. Therefore, a load acting on one underfloor support member 3 is transmitted to an adjacent underfloor support member 3 via the connecting members 6. That is, the area of ​​displacement of the floor plate 2 expands in a planar manner, and multiple underfloor support members 3 are displaced. Then, the ceiling portion 5 repeatedly acts an inertial force in the opposite direction to the displacement direction of the floor plate 2, underfloor support members 3, and connecting members 6 via the joining member 4. As a result, initial vibrations of the floor plate 2 can be suppressed, and floor vibrations can be dampened early.

[0043] According to this embodiment, the joining member 4 has a displacement restricting portion 41 that restricts the relative displacement between the connecting member 6 and the ceiling portion 5. As a result, the vibration of the floor plate 2 is further disturbed, and this vibration can be dampened at an early stage.

[0044] According to this embodiment, the displacement restricting portion 41 includes an extending member 42 that extends in the vertical direction, and a first large-diameter portion 44 that is formed to be larger in diameter than the through-hole 43a of the first flat plate 43 through which the extending member 42 passes, and is positioned above the first flat plate 43. This allows the first flat plate 43, which is displaced relative to the extending member 42, to collide with the first large-diameter portion 44. As a result, the vibration of the floor plate 2 is further disturbed, and this vibration can be dampened at an earlier stage.

[0045] According to this embodiment, the displacement restricting portion 41 has a second large-diameter portion 45 which is formed to be larger in diameter than the through hole 43a and is positioned on the opposite side of the first large-diameter portion 44 with the first flat plate 43 in between, and the distance L between the first large-diameter portion 44 and the second large-diameter portion 45 is greater than the thickness t of the first flat plate 43. As a result, the first flat plate 43, which is displaced relative to the stretching member 42, can be made to collide with the second large-diameter portion 45. Therefore, the vibration of the floor plate 2 is further disturbed, and this vibration can be dampened at an earlier stage.

[0046] According to this embodiment, the connecting member 6 has a first flat plate 43. This makes it easy to attach the first flat plate 43 to the underfloor erection member 3.

[0047] In the case of a heavy-duty wet-type floor made of concrete slabs, the weight is 5000 N / m 2 As the load increases, even if the floorboard is subjected to an impact force, the acceleration is small, and a damping effect based on inertial force cannot be expected. In this respect, according to this embodiment, the floorboard 2 has a load capacity of 700 to 1500 N / m 2 This is a lightweight floor structure 1 composed of the above. Therefore, the vibration damping effect of the floor plate 2 based on the inertial force can be appropriately realized.

[0048] As shown in Figure 7, in the lightweight floor structure 1 of the second embodiment, the connecting member 6 is omitted, and the joining member 4 is directly joined to the underfloor erection member 3. The displacement restricting portion 41 of the joining member 4 further has a latching portion 46.

[0049] The first flat plate 43 is secured to the underfloor erection member 3 by the fastening portion 46. The first flat plate 43, secured to the underfloor erection member 3 by the fastening portion 46, displaces integrally with the floor plate 2.

[0050] The latching portion 46 is latched onto the lower flange 32. The latching portion 46 is a metal fitting made by bending a steel plate, for example. A claw portion is formed at the upper end of the latching portion 46, which latches onto the folded portion of the lower flange 32. A plate portion is formed at the lower end of the latching portion 46. A first flat plate 43 is formed on the plate portion. The latching portion 46 is latched onto the lower flange 32 at a position offset from the widthwise central axis C1 of the underfloor erection member 3.

[0051] According to the second embodiment, a connecting member 4 is provided to connect the underfloor support member 3 and the ceiling portion 5 so that they can be relatively displaced in the vertical direction. As a result, when an impact force acts on the floor plate 2 and the floor plate 2 and the underfloor support member 3 vibrate vertically, the ceiling portion 5, which is connected to the underfloor support member 3 so that they can be relatively displaced, attempts to maintain a stationary state or a state of free fall due to gravity, and an inertial force acts on the ceiling portion 5 in the opposite direction to the displacement direction of the underfloor support member 3. Based on this inertial force, the vibration of the floor plate 2 is disturbed, and this vibration can be dampened at an early stage.

[0052] In the second embodiment, since the fastening portion 46 is fastened to the lower flange 32 at a position offset from the widthwise central axis C1 of the underfloor erection member 3, there is a risk that rotation will be applied to the underfloor erection member 3 when a load is applied to the fastening portion 46. This may cause unpleasant vibrations in the floorboard 2.

[0053] In this regard, according to the first embodiment, there is a fastener 8 that fixes the underfloor erection member 3 and the connecting member 6, and the fastener 8 is arranged symmetrically with respect to the central axis C1 in the width direction of the underfloor erection member 3. As a result, when a load is applied to the connecting member 6, rotation of the underfloor erection member 3 is less likely to occur. Therefore, unpleasant vibrations in the floorboard 2 can be suppressed.

[0054] According to the first embodiment, the extending member 42 is positioned on the widthwise central axis C2 of the connecting member 6. This makes it less likely for the connecting member 6 to rotate when a load is applied to it. As a result, unpleasant vibrations in the floorboard 2 can be suppressed.

[0055] <Third Embodiment> Next, the lightweight floor structure 1 in the third embodiment will be described. Detailed explanations of the same configuration as in the embodiments described above will be omitted below. As shown in Figure 8(a), in the lightweight floor structure 1 in this embodiment, the displacement restricting part 41 further has a base part 47 fixed to the ceiling part 5, and the base part 47 has a first flat plate 43.

[0056] The extension member 42 penetrates the connecting member 6. Two nuts 48 are screwed onto the extension member 42, spaced apart from each other. The connecting member 6 is positioned between the two nuts 48. As a result, the extension member 42 displaces integrally with the underfloor erection member 3.

[0057] The first flat plate 43 is provided on the base 47. The first flat plate 43 provided on the base 47 is displaced integrally with the ceiling 5.

[0058] The distance L between the first large diameter portion 44 and the second large diameter portion 45 is greater than the thickness t of the first flat plate 43. As a result, a gap is formed between the first flat plate 43 and the second large diameter portion 45. Due to this gap, when the floor plate 2 vibrates, the first flat plate 43 and the extension member 42 are displaced relative to each other. As a result, the joining member 4 can be joined so that the ceiling portion 5 is able to be displaced vertically relative to the underfloor erection member 3 and the connecting member 6, without the ceiling portion 5 being displaced integrally with the underfloor erection member 3 and the connecting member 6.

[0059] According to this embodiment, the displacement restricting section 41 further has a base 47 fixed to the ceiling section 5, and the base 47 has a first flat plate 43. This makes it easy to attach the first flat plate 43.

[0060] <Fourth Embodiment> Next, the lightweight floor structure 1 in the fourth embodiment will be described. As shown in Figure 8(b), in the lightweight floor structure 1 in this embodiment, the displacement restricting section 41 further includes a cushioning member 49 disposed between the first large-diameter section 44 and the first flat plate 43 and between the second large-diameter section 45 and the first flat plate 43. In this invention, the cushioning member 49 only needs to be disposed between the first large-diameter section 44 and the first flat plate 43 and between the second large-diameter section 45 and the first flat plate 43. The cushioning member 49 is, for example, an elastic material such as rubber or synthetic resin. When the floor plate 2 vibrates, the cushioning member 49 elastically deforms, so that the connecting member 4 can join the connecting member 6 and the ceiling section 5 so that they can be relatively displaced in the vertical direction, without the ceiling section 5 being displaced integrally with the underfloor erection member 3. The first flat plate 43 is disposed on the connecting member 6.

[0061] According to this embodiment, the displacement restricting section 41 further includes a buffer member 49 positioned at least between the first large-diameter section 44 and the first flat plate 43, and between the second large-diameter section 45 and the first flat plate 43. This allows for buffering of the impact force when the first flat plate 43, which is displaced relative to the stretching member 42, collides with the first large-diameter section 44 and the second large-diameter section 45. As a result, damage to the first flat plate 43, the first large-diameter section 44, and the second large-diameter section 45 can be suppressed. Furthermore, the distance L between the first large-diameter section 44 and the second large-diameter section 45 can be kept greater than the plate thickness t of the first flat plate 43 and constant in a stationary state.

[0062] <Fifth Embodiment> Next, the lightweight floor structure 1 in the fifth embodiment will be described. As shown in Figure 9(a), in the lightweight floor structure 1 in this embodiment, the displacement restricting section 41 has a damper 411 that restricts the relative displacement between the connecting member 6 and the ceiling section 5. The damper 411 is a seismic damping damper that dampens vibrations between the connecting member 6 and the ceiling section 5. For example, a rubber damper using viscoelastic rubber is used for the damper 411.

[0063] The damper 411 is fixed to the extension member 42 located on the upper side and the ceiling portion 5 located on the lower side.

[0064] According to this embodiment, the displacement restricting section 41 has a damper 411. This allows vibrations of the underfloor erection member 3, the connecting member 6, and the ceiling section 5 to be dampened. As a result, vibrations of the floor plate 2 can be dampened at an early stage.

[0065] According to this embodiment, the damper 411 has a rubber damper. This results in a simpler configuration compared to steel dampers or oil dampers. Therefore, the installation of the damper 411 is easier.

[0066] <Sixth Embodiment> Next, the lightweight floor structure 1 in the sixth embodiment will be described. As shown in Figure 9(b), in the lightweight floor structure 1 in this embodiment, the displacement restricting section 41 omits the configuration of the second diameter enlargement section 45. The displacement restricting section 41 has an extending member 42 that extends in the vertical direction, and a first diameter enlargement section 44 that is formed to be larger in diameter than the through hole 43a of the first flat plate 43 through which the extending member 42 passes, and is positioned on the upper side of the first flat plate 43. For example, a wire rope is used as the extending member 42. The first flat plate 43 is positioned on the connecting member 6.

[0067] According to this embodiment, the displacement restricting portion 41 includes an extending member 42 that extends in the vertical direction, and a first large-diameter portion 44 that is formed to be larger in diameter than the through-hole 43a of the first flat plate 43 through which the extending member 42 passes, and is positioned above the first flat plate 43. This allows the first flat plate 43, which is displaced relative to the extending member 42, to collide with the first large-diameter portion 44. As a result, the vibration of the floor plate 2 is further disturbed, and this vibration can be dampened at an earlier stage.

[0068] <Seventh Embodiment> Next, the lightweight floor structure 1 in the seventh embodiment will be described. As shown in Figure 10, in the lightweight floor structure 1 in this embodiment, the connecting member 6 has a plurality of divided members 6-1, divided member 6-2, and divided member 6-3 which are divided in the second planar direction Y. All the underfloor erection members 3 that support the floor plate 2 are erected by the plurality of divided members 6-1, divided member 6-2, and divided member 6-3. In this case, the widthwise central axis C2 of divided member 6-1 and the widthwise central axis C2 of divided member 6-2 may be offset from each other. [Examples]

[0069] The vibration damping effect of the present invention was confirmed in the examples. In the examples, test specimens were prepared and the following tests were performed. In the tests, a ball was dropped onto the prepared test specimens to simulate the vibration when a person places their heel on the floor. In the tests, the time history of the acceleration and displacement of the floorboard after the ball fell was measured, respectively. Test specimens prepared were the present invention example, comparative example 1, comparative example 2, and comparative example 3.

[0070] The test specimen of the present invention is modeled after a lightweight floor structure as shown in Figure 2. The connecting member and the ceiling section are joined by a connecting member so that the connecting member and the ceiling section can be displaced relative to each other in the vertical direction. Furthermore, the displacement restricting section is configured to include an extending member that extends in the vertical direction, a first large-diameter section formed to be larger in diameter than the through-hole in the first flat plate through which the extending member passes and positioned above the first flat plate, and a second large-diameter section formed to be larger in diameter than the through-hole in the first flat plate and positioned on the opposite side of the first large-diameter section with the first flat plate in between. The distance between the first large-diameter section and the second large-diameter section is greater than the thickness of the first flat plate.

[0071] The test specimens of Comparative Examples 1 and 3 mimicked a conventional floor structure as shown in Figure 12, but instead of horizontal members supporting the floorboards, ceiling joists were installed, and the ceiling of the lower floor was suspended from the ceiling joists.

[0072] As shown in Figure 7, the test specimen of Comparative Example 2 omitted the connecting member 6, and the underfloor erection member and the ceiling section were joined by a connecting member so that the underfloor erection member and the ceiling section could be displaced relative to each other.

[0073] <Test: Ball drop test> As shown in Figure 11(a), in both Comparative Example 1 and Comparative Example 2, the maximum displacement during vertical floor vibration was approximately 0.3 mm in the initial stages of floor vibration (around 0.52 seconds after the start of the fall). In Comparative Example 2, the displacement of the floorboard became almost zero after approximately 0.25 seconds, from 0.5 seconds to 0.75 seconds after the start of the fall, confirming that the damping effect was greater than in Comparative Example 1.

[0074] As shown in Figure 11(b), in the initial stages of floor vibration (around 2.02 seconds after the start of the fall), the displacement of the present invention example was smaller than that of Comparative Example 3. Furthermore, the maximum displacement of the present invention example was approximately 0.17 mm, while the maximum displacement of Comparative Example 3 was approximately 0.22 mm, indicating a reduction in displacement of approximately 75%. In the present invention example, after approximately 0.25 seconds, from 2.0 seconds to 2.25 seconds after the start of the fall, the displacement of the floorboard became almost zero, confirming a greater damping effect than that of Comparative Example 3.

[0075] In the above-described example of the present invention, the connecting member causes an inertial force to repeatedly act on the ceiling in the opposite direction to the displacement direction of the floor plate, the underfloor support member, and the connecting member. As a result, the vibration of the floor plate is disturbed, and this vibration can be dampened early. In addition, the first flat plate collides with the first and second large diameter sections, restricting the relative displacement between the underfloor support member and the ceiling. Therefore, the vibration of the floor plate is more easily disturbed, and the vibration can be further damped.

[0076] In particular, in this example of the present invention, since there is a connecting member for erecting the underfloor erection member, the initial displacement of floor vibration can be made smaller than in conventional floor structures.

[0077] Furthermore, in the example of the present invention, the maximum displacement of the floor plate when a small impact force was assumed was about 0.3 mm. For this reason, in the present invention, it is preferable that the length of the gap between the first flat plate and the second large diameter section (distance L - plate thickness t) is greater than 0 mm and less than or equal to 0.3 mm. This makes it easier to restrict the relative displacement between the connecting member and the ceiling section, as the first flat plate, which is displaced relative to the stretching member, collides with the first large diameter section and the second large diameter section, regardless of whether the impact force is large or small.

[0078] Although some embodiments of this invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. Furthermore, these embodiments can be combined as appropriate. In addition, this invention can be implemented in various novel forms other than those described above. Therefore, each of the above embodiments can be omitted, replaced, or modified in various ways without departing from the spirit of this invention. Such novel forms and modifications are included in the scope and spirit of this invention, as well as in the claims and equivalents of the claims. [Explanation of Symbols]

[0079] 1: Lightweight floor structure 2: Floorboards 3: Underfloor erection components 31: Upper flange 32: Lower flange 33: Web 4: Joining member 41: Displacement Control Section 411: Damper 42: Extendable member 43: 1st plate 43a: Through hole 44: First diameter large section 45: Second diameter large section 46:Latching part 47: Base 48: Nut 49: Cushioning material 5: Ceiling 6: Connecting member 61: End fittings 7: Main Beam 8: Fixtures 91: Bed Structure 92: Bed board 93:Horizontal frame material 95: Patio 97: Da Liang 98: Amai Neta C1: Central axis C2: Central axis

Claims

1. A lightweight floor structure in a building having a lower floor and an upper floor, The floorboards of the upper floor, Multiple underfloor support members are installed below the floorboard and support the floorboard, A connecting member fixed to the lower surface of the underfloor erection member and erected on multiple underfloor erection members, The ceiling portion of the lower floor, which is spaced apart below the connecting member, The system includes a connecting member that joins the connecting member and the ceiling portion so that they can be displaced relative to each other in the vertical direction. A lightweight floor structure characterized by the following features.

2. The connecting member has a displacement restricting portion that restricts the relative displacement between the connecting member and the ceiling portion. The lightweight floor structure according to claim 1, characterized by the above.

3. The displacement restricting section is An extendable member that extends in the vertical direction, The extending member has a first large-diameter portion which is formed to be larger in diameter than the through-hole in the first flat plate through which the extending member passes, and which is positioned above the first flat plate. The lightweight floor structure according to claim 2, characterized by the above.

4. The displacement restricting section is It has a second large diameter portion which is formed to be larger in diameter than the through hole and is positioned on the opposite side of the first large diameter portion with respect to the first flat plate, The distance between the first diameter portion and the second diameter portion is greater than the thickness of the first flat plate. The lightweight floor structure according to claim 3, characterized by the above.

5. The connecting member has the first flat plate. A lightweight floor structure according to claim 3 or 4, characterized by the above.

6. The displacement restricting part further has a base that is fixed to the ceiling, The base portion has the first flat plate. A lightweight floor structure according to claim 3 or 4, characterized by the above.

7. The displacement restricting portion further comprises a buffer member positioned at least between the first large-diameter portion and the first flat plate, and between the second large-diameter portion and the first flat plate. The lightweight floor structure according to claim 4, characterized by the above.

8. The displacement restricting section has a damper. The lightweight floor structure according to claim 2, characterized by the above.

9. The damper has a rubber damper. The lightweight floor structure according to claim 8, characterized by the above.

10. The extending member is positioned on the central axis in the width direction of the connecting member. The lightweight floor structure according to claim 3, characterized by the above.

11. It has a fastening device for fixing the underfloor erection member and the connecting member, The fasteners are arranged symmetrically with respect to the central axis in the width direction of the underfloor erection member. The lightweight floor structure according to claim 1, characterized by the above.

Images