Lightweight floor structure

Abstract

To provide a lightweight floor structure that can easily secure underfloor space while enabling early damping of floor vibrations.SOLUTION: A lightweight floor structure 1 in an embodiment is a lightweight floor structure 1 in a building having a lower floor portion and an upper floor portion. It comprises: a floor panel 2 of the upper floor portion; an underfloor construction member 3 constructed below the floor panel 2 and supporting the floor panel 2; a ceiling portion 5 of the lower floor portion spaced apart below the underfloor construction member 3; and a connection member 4 connecting the underfloor construction member 3 and the ceiling portion 5 in a manner allowing relative vertical displacement.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a lightweight floor structure for a building having a lower floor and an upper floor. [Background technology]

[0002] Lightweight floors made of wood or lightweight steel are more likely to produce unpleasant vibrations at low impact forces, such as those caused by footsteps, compared to heavyweight floors made of concrete. In particular, in offices, classrooms, and other areas where many people walk, desk workers may find nearby footsteps unpleasant, and there is a need to suppress the vibrations. Patent Document 1, for example, discloses a technology for suppressing vibrations in floor structures.

[0003] The under-floor damper of Patent Document 1 comprises a first elastic body, a second elastic body, and a weight portion, and the first elastic body, the second elastic body, and the weight portion are connected to each other in series with the weight portion as the tip. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-108744 Summary of the Invention [Problem to be solved by the invention]

[0005] The technology disclosed in Patent Document 1 requires a weight and an elastic body (metal fittings) that connects the weight to the floor joists, and tuning the weight and metal fittings to attenuate impact noise and foot vibrations takes time. In addition, if the floor weight changes due to fixtures or other factors on the floor, the ceiling must be removed and the weight and metal fittings must be retuned. Furthermore, because the weight and metal fittings are installed in the space under the floor (attic), it becomes difficult to install wiring, air conditioning ducts, and other piping in the space under the floor. Furthermore, because the weight of the floor increases, the floor span length is limited, and the horizontal force on the floor during an earthquake increases, requiring the addition of additional bearing walls to accommodate the increased load.

[0006] As shown in Figure 10, in a conventional floor structure 91, cross members 93 that support floorboards 92 of the upper floor, such as minor beams or joists, are erected on girders 97 that are erected on pillars (not shown). In the conventional floor structure 91, in order to prevent vibrations from the floorboards 92 from propagating to the ceiling 95 of the lower floor, ceiling joists 98 separate from the cross 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 from the ceiling 95, preventing vibrations from the floorboards 92 from propagating to the ceiling 95 of the lower floor. However, in the conventional floor structure 91, because the ceiling joists 98 are installed in the space under the floorboards 92, it becomes difficult to install piping such as wiring and air conditioning ducts in this space under the floor.

[0007] Therefore, the present invention was devised in consideration of the above-mentioned circumstances, and its object is to provide a lightweight floor structure that can quickly damp floor vibrations and easily ensure underfloor space. [Means for solving the problem]

[0008] The lightweight floor structure of the present invention is a lightweight floor structure in a building having a lower floor and an upper floor, and is characterized by comprising floor panels of the upper floor, underfloor erection members erected below the floor panels and supporting the floor panels, a ceiling portion of the lower floor arranged below and spaced apart from the underfloor erection members, and connecting members that join the underfloor erection members and the ceiling portion so that they can be displaced relative to each other in the vertical direction. [Effects of the Invention]

[0009] According to the present invention, a connecting member is provided that connects the underfloor installation member and the ceiling portion so that they can be displaced relative to each other in the vertical direction. As a result, when an impact force acts on the floorboards and the underfloor installation member, causing them to vibrate up and down, the ceiling portion, which is connected by the connecting member so that it can be displaced relative to each other, tries to maintain a stationary state or a state of free fall due to gravity, and an inertial force in the direction opposite to the displacement of the underfloor installation member is repeatedly applied by the ceiling portion. As a result, the vibration of the floorboards is disturbed, and this vibration can be quickly attenuated.

[0010] According to the present invention, a connecting member is provided that connects the underfloor installation members and the ceiling section so that they can be displaced relative to each other in the vertical direction. Because the underfloor installation members that support the floorboards are connected to the ceiling section via the connecting member, the top board joists used in conventional floor structures to suspend the ceiling are no longer necessary. This makes it easier to secure underfloor space for installing wiring, air conditioning ducts, and other piping. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a diagram showing an example of a lightweight floor structure in the first embodiment. [Figure 2] FIG. 2 is a diagram showing an example of a lightweight floor structure in the first embodiment. [Figure 3] Figure 3 shows an example of a lightweight floor structure in the first embodiment, where Figure 3(a) is a diagram showing the state before an impact force is applied, Figure 3(b) is a diagram showing the state when the floor board is displaced downward, and Figure 3(c) is a diagram showing the state when the floor board is displaced upward. [Figure 4] FIG. 4(a) is a diagram showing an example of a lightweight floor structure in the second embodiment, and FIG. 4(b) is a diagram showing an example of a lightweight floor structure in the third embodiment. [Figure 5] FIG. 5(a) is a diagram showing an example of a lightweight floor structure in the fourth embodiment, and FIG. 5(b) is a diagram showing an example of a lightweight floor structure in the fifth embodiment. [Figure 6] FIG. 6 is a diagram showing an example of a lightweight floor structure according to the sixth embodiment. [Figure 7] Figure 7 shows an example of a lightweight floor structure in the seventh embodiment, where Figure 7(a) is a diagram showing the state before an impact force is applied, Figure 7(b) is a diagram showing the state when the floor board is displaced downward, and Figure 7(c) is a diagram showing the state when the floor board is displaced upward. [Figure 8] FIG. 8 shows the results of Test 1, where FIG. 8(a) is a graph showing the time history of acceleration for an example of the present invention and comparative example 1, FIG. 8(b) is a graph showing the time history of displacement for an example of the present invention and comparative example 1, and FIG. 8(c) is a graph showing the time history of displacement for comparative examples 1 and 2. [Figure 9] FIG. 9 shows the results of Test 2, where FIG. 9(a) is a graph showing the time history of acceleration for an example of the present invention and comparative example 1, FIG. 9(b) is a graph showing the time history of displacement for an example of the present invention and comparative example 1, and FIG. 9(c) is a graph showing the time history of displacement for comparative examples 1 and 2. [Figure 10] FIG. 10 is a diagram showing an example of a conventional floor structure. DETAILED DESCRIPTION OF THE INVENTION

[0012] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments for carrying out a lightweight floor structure to which the present invention is applied will be described in detail with reference to the drawings.

[0013] First Embodiment As shown in Figure 1, the lightweight floor structure 1 is a lightweight floor structure for a building having a lower floor and an upper floor. The lightweight floor structure 1 is a dry floor structure constructed without pouring concrete, such as a wooden or lightweight steel frame construction. The lightweight floor structure 1 comprises floorboards 2 for the upper floor, underfloor erection members 3, connecting members 4, a ceiling portion 5 for the lower floor, and girders 7. The girders 7 are erected on columns (not shown). The girders 7 are arranged in a grid pattern.

[0014] The floor boards 2 are, for example, wood-based surface materials such as plywood, cement-based surface materials such as wood-chip cement boards, or steel-plate surface materials such as deck plates. The combined mass of the floor boards 2, the underfloor erection members 3, and the above-floor finishing materials is, for example, 700 to 1500 N / m 2 It consists of:

[0015] The underfloor installation members 3 are erected below the floorboards 2. The underfloor installation members 3 are at least either joists or small beams, and support the floorboards 2. The underfloor installation members 3 are erected on a pair of girders 7. Lightweight steel frames are used for the underfloor installation members 3. The underfloor installation members 3 may also be made of wood.

[0016] As shown in FIG. 2, the underfloor installation member 3 is made of, for example, a steel beam with an I-shaped cross section. The underfloor installation member 3 has an upper flange 31, a lower flange 32, and a web 33. The floor panel 2 is placed on the upper flange 31. Both ends of the upper flange 31 in the width direction are formed with folded pieces that are folded back downward. The lower flange 32 is provided with a joining member 4. Both ends of the lower flange 32 in the width direction are formed with folded pieces that are folded back upward. The web 33 connects the upper flange 31 and the lower flange 32.

[0017] The ceiling section 5 is disposed below the underfloor installation members 3 at a distance. The ceiling section 5 is preferably composed of 5 to 20% of the weight of the floorboards 2. The ceiling section 5 is formed, for example, by joining a rough joist and a ceiling surface material. The rough joist that constitutes the ceiling section 5 is, for example, a light-weight ceiling base or wood. The ceiling surface material that constitutes the ceiling section 5 is a wood-based surface material such as gypsum board or plywood, or a ceramic-based surface material such as calcium silicate board.

[0018] The joint member 4 joins the underfloor installation member 3 and the ceiling portion 5 so as to be capable of relative displacement in the up-down direction.

[0019] The displacement regulating portion 41 regulates relative displacement between the underfloor installation member 3 and the ceiling portion 5. The displacement regulating portion 41 has an extension member 42, a first flat plate 43, a first large diameter portion 44, a second large diameter portion 45, a hook portion 46, and a base portion 47.

[0020] The extension member 42 is composed of a rod-shaped member that extends in the vertical direction. The extension member 42 is formed using, for example, a fully threaded bolt or the like, and has a threaded portion formed around its periphery. A base 47 is fixed to the lower end of the extension member 42, and the base 47 is fixed to the ceiling 5. Therefore, the extension member 42 is displaced integrally with the ceiling 5.

[0021] The first flat plate 43 has a through hole 43a formed therein, through which the extension member 42 passes. The first flat plate 43 is disposed below the lower flange 32. The first flat plate 43 is hooked to the underfloor installation member 3 by a hook portion 46. The first flat plate 43, which is hooked to the underfloor installation member 3 by the hook portion 46, is displaced integrally with the floor plate 2.

[0022] The hook portion 46 is hooked onto the lower flange 32. The hook portion 46 is a metal fitting formed by bending, for example, a steel plate. A claw portion 46a is formed at the upper end of the hook portion 46, and the claw portion 46a is hooked onto the folded piece of the lower flange 32. A plate portion 46b is formed at the lower end of the hook portion 46. The first flat plate 43 is formed on the plate portion 46b.

[0023] The first large diameter portion 44 is formed to have a larger diameter than the through hole 43a of the first flat plate 43 through which the extension member 42 passes, and is disposed above the first flat plate 43. The first large diameter portion 44 is formed, for example, by a nut, and is screwed onto the threaded portion of the extension member 42. The first large diameter portion 44 can suspend the extension member 42 from the first flat plate 43. When the extension member 42 is a wire rope, the first large diameter portion 44 may be a wire clip or the like.

[0024] The second large diameter portion 45 is formed to have a larger diameter than the through hole 43a and is disposed on the opposite side of the first flat plate 43 from the first large diameter portion 44. For example, a nut is used for the second large diameter portion 45, and it is screwed onto the threaded portion of the extension member 42. When the extension member 42 is a wire rope, the second large diameter portion 45 may be a wire clip or the like.

[0025] The distance L between the first large diameter portion 44 and the second large diameter portion 45 is greater than the plate thickness t of the first flat plate 43. Therefore, a gap is formed between the first flat plate 43 and the second large diameter portion 45. This gap causes relative displacement between the first flat plate 43 and the extension member 42 when the floor plate 2 vibrates. Therefore, the joining member 4 can join the under-floor installation member 3 and the ceiling portion 5 so that the ceiling portion 5 can be displaced relative to each other in the up-and-down direction, without the ceiling portion 5 displacing integrally with the under-floor installation member 3.

[0026] The first large diameter portion 44 restricts the relative displacement between the underfloor installation member 3 and the ceiling 5 by causing the first flat plate 43, which has been displaced relative to the extension member 42, to collide with it. The second large diameter portion 45 restricts the relative displacement between the underfloor installation member 3 and the ceiling 5 by causing the first flat plate 43, which has been displaced relative to the extension member 42, to collide with it. Therefore, the displacement restriction portion 41 can restrict the relative displacement between the underfloor installation member 3 and the ceiling 5.

[0027] The length of the gap between the first flat plate 43 and the second large-diameter portion 45 (distance L - plate thickness t) is preferably greater than 0 mm and not greater than 0.3 mm. This allows the first flat plate 43, which is displaced relative to the extension member 42, to collide with the first large-diameter portion 44 and the second large-diameter portion 45, making it easier to regulate the relative displacement between the underfloor installation member 3 and the ceiling portion 5. This makes it easier to disturb the vibration of the floor plate 2, thereby further damping the vibration.

[0028] Furthermore, when screwing the first large diameter portion 44 and the second large diameter portion 45 into the threaded portion of the extension member 42, it is preferable to tighten them by hand without using a tool. This makes it easier to ensure a gap between the first flat plate 43 and the second large diameter portion 45.

[0029] The extension member 42 and the ceiling portion 5 are fixed to the base portion 47. The base portion 47 is made of, for example, structural steel.

[0030] Next, the vibration damping effect in this embodiment will be described with reference to FIG.

[0031] As shown in Figure 3(a), before an impact force acts on the floor panel 2, the underfloor installation member 3 and the ceiling portion 5 are in a stationary state. Then, as shown in Figure 3(b), when an impact force acts on the floor panel 2, the floor panel 2 and the underfloor installation member 3 are displaced downward. At this time, the ceiling portion 5, which is joined to the underfloor installation member 3 by the joining member 4 so as to be able to move relatively up and down, tries to maintain a stationary state without displacing integrally with the underfloor installation member 3, and an upward inertial force (in the opposite direction to the displacement direction of the underfloor installation member 3) acts on the ceiling portion 5. Thereafter, the ceiling portion 5 falls freely due to gravity, with a delay compared to the downward displacement of the floor panel 2 and the underfloor installation member 3.

[0032] 3(c), the floorboards 2 and underfloor installation members 3 that have been subjected to the impact force vibrate, causing them to displace downward and then reverse to upward displacement. At this time, the ceiling section 5, which is joined to the underfloor installation members 3 by the joining members 4 so as to be able to move relatively up and down, tries to maintain a state of free fall due to gravity without displacing integrally with the underfloor installation members 3, and a downward inertial force (in the opposite direction to the displacement direction of the underfloor installation members 3) acts on the ceiling section 5.

[0033] In this way, the connecting members 4 cause the ceiling 5 to repeatedly apply an inertial force in the direction opposite to the displacement direction of the floorboards 2 and the underfloor installation members 3. As a result, the vibration of the floorboards 2 is disturbed, and this vibration can be quickly damped.

[0034] According to this embodiment, the connecting members 4 are provided to connect the underfloor installation members 3 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 boards 2 and the floor boards 2 and the underfloor installation members 3, causing them to vibrate up and down, an inertial force acts on the ceiling portion 5 in the direction opposite to the displacement direction of the underfloor installation members 3, as the ceiling portion 5, which is connected by the connecting members 4 so that it can be displaced relative to each other, tries to maintain a stationary state or a state of free fall due to gravity. This inertial force disrupts the vibration of the floor boards 2, allowing the vibration to be attenuated quickly.

[0035] Furthermore, according to this embodiment, a connecting member 4 is provided that connects the underfloor installation members 3 and the ceiling section 5 so that they can be displaced relative to each other in the vertical direction. Because the underfloor installation members 3 that support the floorboards 2 and the ceiling section 5 are connected via the connecting member 4, the top board joists used to suspend the ceiling, which are used in conventional floor structures, are no longer necessary. This makes it easier to ensure underfloor space for installing wiring, air conditioning ducts, and other piping.

[0036] According to this embodiment, the connecting member 4 has a displacement restriction portion 41 that restricts the relative displacement between the underfloor installation member 3 and the ceiling portion 5. This further disturbs the vibration of the floorboard 2, allowing this vibration to be attenuated quickly.

[0037] According to this embodiment, the displacement regulating portion 41 has an extension member 42 extending in the vertical direction, and a first large diameter portion 44 formed with a diameter larger than the through-hole 43a of the first flat plate 43 through which the extension member 42 passes and disposed above the first flat plate 43. This allows the first flat plate 43, which is displaced relative to the extension member 42, to collide with the first large diameter portion 44. This further disturbs the vibration of the floorboard 2, allowing this vibration to be attenuated quickly.

[0038] According to this embodiment, the displacement regulating portion 41 has a second large diameter portion 45 that is formed with a larger diameter than the through hole 43a and is disposed on the opposite side of the first flat plate 43 from the first large diameter portion 44, and the distance L between the first large diameter portion 44 and the second large diameter portion 45 is greater than the plate thickness t of the first flat plate 43. This allows the first flat plate 43, which is displaced relative to the extension member 42, to collide with the second large diameter portion 45. This further disturbs the vibration of the floor plate 2, allowing this vibration to be attenuated quickly.

[0039] According to this embodiment, the displacement regulating portion 41 further has a hook portion 46 that is hooked onto the underfloor installation member 3, and the hook portion 46 has a first flat plate 43. This eliminates the need for drilling holes to attach the first flat plate 43 to the underfloor installation member 3. This prevents damage to the underfloor installation member 3. Furthermore, because the first flat plate 43 is hooked onto the underfloor installation member 3 by the hook portion 46, it also becomes easy to attach the first flat plate 43 to the underfloor installation member 3.

[0040] For heavy-duty wet concrete floors, the weight is 5000N / m 2 Therefore, even if an impact force is applied to the floorboard, the acceleration is small and the damping effect based on the inertial force cannot be expected. 2 Therefore, the lightweight floor structure 1 can appropriately exhibit the effect of damping vibration of the floor panel 2 caused by the inertial force.

[0041] Second Embodiment Next, a lightweight floor structure 1 in a second embodiment will be described. Detailed description of the same configuration as in the above-mentioned embodiment will be omitted below. As shown in FIG. 4(a), in the lightweight floor structure 1 in this embodiment, the displacement regulating portion 41 further has a base portion 47 fixed to the ceiling portion 5, and the base portion 47 has a first flat plate 43.

[0042] The extension member 42 is penetrated by the plate portion 46b of the hooking portion 46 above the first large diameter portion 44. Two nuts 48 spaced apart from each other are screwed onto the extension member 42. The plate portion 46b is disposed between the two nuts 48. The extension member 42 is fixed to the hooking portion 46, which is fixed to the underfloor installation member 3. Therefore, the extension member 42 is displaced integrally with the underfloor installation member 3.

[0043] 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 portion 5.

[0044] The upper end of the hook portion 46 is formed with a claw portion 46a that is hooked onto the folded piece of the lower flange 32. The lower end of the hook portion 46 is formed with a plate portion 46b.

[0045] The distance L between the first large diameter portion 44 and the second large diameter portion 45 is greater than the plate thickness t of the first flat plate 43. Therefore, a gap is formed between the first flat plate 43 and the second large diameter portion 45. This gap causes relative displacement between the first flat plate 43 and the extension member 42 when the floor plate 2 vibrates. Therefore, the joining member 4 can join the under-floor installation member 3 and the ceiling portion 5 so that the ceiling portion 5 can be displaced relative to each other in the up-and-down direction, without the ceiling portion 5 displacing integrally with the under-floor installation member 3.

[0046] According to this embodiment, the displacement regulating portion 41 further has a hook portion 46 that can be hooked onto the underfloor installation member 3, and the base portion 47 has a first flat plate 43. This eliminates the need for drilling holes to attach the first flat plate 43 to the underfloor installation member 3. This prevents damage to the underfloor installation member 3. Furthermore, because the first flat plate 43 can be hooked onto the underfloor installation member 3 by the hook portion 46, it also becomes easier to attach the first flat plate 43 to the underfloor installation member 3.

[0047] Third Embodiment Next, a lightweight floor structure 1 according to a third embodiment will be described. As shown in FIG. 4(b), in the lightweight floor structure 1 according to this embodiment, the displacement regulating section 41 further includes a buffer 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 the present invention, the buffer member 49 may be disposed at least either between the first large-diameter section 44 and the first flat plate 43 or between the second large-diameter section 45 and the first flat plate 43. The buffer member 49 is an elastic member made of, for example, rubber or synthetic resin. When the floor panel 2 vibrates, the buffer member 49 elastically deforms, so that the connecting member 4 can connect the underfloor installation member 3 and the ceiling portion 5 so that the ceiling portion 5 is not displaced integrally with the underfloor installation member 3, but is capable of relative vertical displacement.

[0048] According to this embodiment, the displacement restriction portion 41 further includes a buffer member 49 disposed at least either between the first large diameter portion 44 and the first flat plate 43 or between the second large diameter portion 45 and the first flat plate 43. This buffers the impact force when the first flat plate 43, which is displaced relative to the extension member 42, collides with the first large diameter portion 44 and the second large diameter portion 45. This reduces damage to the first flat plate 43, the first large diameter portion 44, and the second large diameter portion 45. Furthermore, the distance L between the first large diameter portion 44 and the second large diameter portion 45 can be kept constant and greater than the plate thickness t of the first flat plate 43 in a stationary state.

[0049] <Fourth embodiment> Next, a lightweight floor structure 1 in a fourth embodiment will be described. As shown in Fig. 5(a), in the lightweight floor structure 1 in this embodiment, the displacement regulating section 41 has a damper 411 that regulates the relative displacement between the underfloor installation member 3 and the ceiling section 5. The damper 411 is a seismic damper that attenuates vibrations between the underfloor installation member 3 and the ceiling section 5. The damper 411 is, for example, a rubber damper that uses viscoelastic rubber.

[0050] The damper 411 is fixed to the extension member 42 arranged above it and the ceiling portion 5 arranged below it.

[0051] According to this embodiment, the displacement regulating portion 41 has a damper 411. This can damp vibrations of the underfloor construction member 3 and the ceiling portion 5. Therefore, vibrations of the floor board 2 can be damped quickly.

[0052] According to this embodiment, the damper 411 has a rubber damper. This makes the structure simpler than a steel damper or an oil damper. This makes it easier to install the damper 411.

[0053] Fifth Embodiment Next, a lightweight floor structure 1 in a fifth embodiment will be described. As shown in Fig. 5(b), in the lightweight floor structure 1 in this embodiment, the displacement regulating portion 41 does not include the hook portion 46. In the displacement regulating portion 41, the first flat plate 43 is formed on the lower flange 32 of the underfloor installation member 3.

[0054] Sixth Embodiment Next, a lightweight floor structure 1 in a sixth embodiment will be described. As shown in Fig. 6, in the lightweight floor structure 1 in this embodiment, the displacement regulating section 41 does not include the second large diameter section 45. The displacement regulating section 41 has an extension member 42 extending in the vertical direction, and a first large diameter section 44 that is formed with a diameter larger than the through-hole 43a of a first flat plate 43 through which the extension member 42 passes and is disposed above the first flat plate 43. A wire rope, for example, is used as the extension member 42.

[0055] According to this embodiment, the displacement regulating portion 41 has an extension member 42 extending in the vertical direction, and a first large diameter portion 44 formed with a diameter larger than the through-hole 43a of the first flat plate 43 through which the extension member 42 passes and disposed above the first flat plate 43. This allows the first flat plate 43, which is displaced relative to the extension member 42, to collide with the first large diameter portion 44. This further disturbs the vibration of the floorboard 2, allowing this vibration to be attenuated quickly.

[0056] Seventh Embodiment Next, a description will be given of the lightweight floor structure 1 in the seventh embodiment. As shown in Fig. 7, the lightweight floor structure 1 in this embodiment further includes connecting members 6 that connect the plurality of underfloor installation members 3 arranged side by side.

[0057] The connecting member 6 extends in a direction perpendicular to the extension direction of the underfloor installation member 3. The connecting member 6 is made of steel plate, structural steel, etc. Both ends of the connecting member 6 in the extension direction are bolted to the underfloor installation member 3. The connecting member 6 is positioned away from the main girder (not shown).

[0058] Next, the vibration damping effect in this embodiment will be described with reference to FIG.

[0059] As shown in Figure 7(a), before an impact force acts on the floor panel 2, the underfloor installation member 3 and the ceiling portion 5 are in a stationary state. Then, as shown in Figure 7(b), when an impact force acts on the floor panel 2, the floor panel 2 and the underfloor installation member 3 are displaced downward. At this time, the ceiling portion 5, which is joined to the underfloor installation member 3 by the joining member 4 so as to be able to move relatively in the up and down direction, tries to maintain a stationary state without displacing integrally with the underfloor installation member 3, and an upward inertial force (in the opposite direction to the displacement direction of the underfloor installation member 3) acts on the ceiling portion 5. Thereafter, the ceiling portion 5 falls freely due to gravity, with a delay compared to the downward displacement of the floor panel 2 and the underfloor installation member 3.

[0060] 7(c), the floorboards 2 and the underfloor installation members 3 that have been subjected to the impact force vibrate, causing them to displace downward and then reverse to upward displacement. At this time, the ceiling section 5, which is joined to the underfloor installation members 3 by the joining members 4 so as to be able to move relatively up and down, tries to maintain a state of free fall due to gravity without displacing integrally with the underfloor installation members 3, and a downward inertial force (in the opposite direction to the displacement direction of the underfloor installation members 3) acts on the ceiling section 5.

[0061] In particular, because the underfloor installation members 3 are connected to each other by the connecting members 6, the displacement of the floor panels 2 also spreads in the extension direction of the connecting members 6. In other words, the area of ​​displacement of the floor panels 2 spreads across the surface, and the multiple underfloor installation members 3 are displaced. Then, due to the multiple connecting members 4, an inertial force in the direction opposite to the displacement direction of the floor panels 2 and the underfloor installation members 3 is repeatedly applied by the ceiling part 5. As a result, the vibration of the floor panels 2 becomes more easily disturbed, and this vibration can be damped more quickly.

[0062] According to this embodiment, the structure further includes connecting members 6 that connect the multiple underfloor installation members 3 arranged side by side. This expands the area in which the floorboards 2 are displaced, displacing the multiple underfloor installation members 3. Then, due to the multiple connecting members 4, an inertial force in the direction opposite to the displacement direction of the floorboards 2 and the underfloor installation members 3 is repeatedly applied by the ceiling part 5. As a result, the vibration of the floorboards 2 is more likely to be disturbed, and this vibration can be damped more quickly. [Example]

[0063] The vibration damping effect of the present invention was confirmed in the examples. In the examples, test specimens were prepared and the following tests 1 and 2 were carried out. In test 1, a tire was dropped onto the prepared test specimen to simulate the vibration caused by a person jumping. In test 2, a ball was dropped onto the prepared test specimen to simulate the vibration caused by a person putting their heels down on the floor. In tests 1 and 2, the time history of the acceleration and displacement of the floor panel after the tire or ball was dropped was measured. Test specimens prepared were an example of the present invention, comparative example 1, and comparative example 2.

[0064] The specimen of the present invention simulated a lightweight floor structure as shown in Fig. 2, and the underfloor installation members supporting the floorboards were joined to the ceiling section by joining members so that the ceiling section and the underfloor installation members could be displaced relative to each other in the vertical direction. The displacement restrictor also included an extension member extending in the vertical direction, a first large-diameter portion formed with a diameter larger than the through-hole in the first flat plate through which the extension member passes and positioned above the first flat plate, and a second large-diameter portion formed with a diameter larger than the through-hole in the first flat plate and positioned on the opposite side of the first large-diameter portion across the first flat plate. The distance between the first large-diameter portion and the second large-diameter portion was greater than the thickness of the first flat plate.

[0065] The test specimen of Comparative Example 1 was a replica of a conventional floor structure as shown in Figure 10, in which ceiling joists different from the cross members supporting the floorboards were installed, and the ceiling of the lower floor was suspended from the ceiling joists.

[0066] In the test specimen of Comparative Example 2, the underfloor installation members supporting the floorboards and the ceiling portion were rigidly joined by joining members so that the underfloor installation members and the ceiling portion could be displaced integrally in the up and down direction.

[0067] <Test 1: Tire drop test> As shown in Figure 8(a), the maximum acceleration during vertical floor vibration is 30 m / s 2 This was approximately three times the gravitational acceleration. Since the vibration acceleration of the floorboards exceeded the falling (gravitational) acceleration of the ceiling, it was confirmed that the floor movement was faster. In the example of the present invention, multiple accelerations occurred in the opposite direction to the floor vibration due to the inertial force of the ceiling. This is thought to be because, in the example of the present invention, the inertial force was transmitted from the ceiling to the floor by the connecting member, disrupting the floor vibration. In addition, in the example of the present invention, it is thought to be because the first flat plate, which displaces relative to the extension member, collided with the first large-diameter section and the second large-diameter section, restricting the relative displacement between the underfloor erection member and the ceiling, disrupting the vibration of the floorboards.

[0068] As shown in Figure 8(b), the maximum displacement during vertical floor vibration was approximately 1.5 mm for the example of the present invention and comparative example 1. In the example of the present invention, the displacement of the floorboard was almost zero approximately 0.25 seconds after the start of the drop, from 0.5 to 0.75 seconds, confirming a large damping effect. In contrast, as shown in Figures 8(b) and 8(c), in comparative examples 1 and 2, the floorboard continued to vibrate even approximately 0.25 seconds after the start of the drop, from 0.5 to 0.75 seconds, confirming a small damping effect.

[0069] <Test 2: Ball drop test> As shown in Figure 9(a), the maximum acceleration during vertical floor vibration is 10 m / s 2 This is approximately 1 times the gravitational acceleration. When the vibration acceleration of the floorboard is equal to or less than the gravitational acceleration of the ceiling, downward acceleration of the floorboard generates buoyancy in the ceiling. When upward acceleration of the floorboard generates an acceleration in the ceiling that is the sum of the gravitational acceleration and the acceleration of the floorboard. In the example of the present invention, multiple accelerations occurred in the opposite direction to the floor vibration due to the inertial force of the ceiling. This is thought to be because, in the example of the present invention, the inertial force is transmitted from the ceiling to the floor by the connecting member, disrupting the floor vibration. In addition, in the example of the present invention, the first flat plate, which is displaced relative to the extension member, collides with the first large-diameter section and the second large-diameter section, restricting the relative displacement between the underfloor installation member and the ceiling, disrupting the vibration of the floorboard.

[0070] As shown in Figure 9(b), the maximum displacement during vertical floor vibration was approximately 0.3 mm for the example of the present invention and comparative example 1. In the example of the present invention, the displacement of the floorboard was almost zero approximately 0.25 seconds after the start of the drop, from 0.5 to 0.75 seconds, confirming a large damping effect. In contrast, as shown in Figures 9(b) and 9(c), in comparative examples 1 and 2, the floorboard continued to vibrate even approximately 0.25 seconds after the start of the drop, from 0.5 to 0.75 seconds, confirming a small damping effect.

[0071] As described above, in this example of the present invention, the connecting members repeatedly apply an inertial force from the ceiling in a direction opposite to the displacement direction of the floorboards and the underfloor installation members. As a result, the vibration of the floorboards is disturbed, and this vibration can be quickly damped. In addition, the first flat plate collides with the first large-diameter portion and the second large-diameter portion, restricting the relative displacement between the underfloor installation members and the ceiling. This makes it easier to disturb the vibration of the floorboards, and the vibration can be further damped.

[0072] Furthermore, in the present invention examples, the early damping effect of the floorboards was confirmed whether a large impact force was applied as in Test 1 or a small impact force was applied as in Test 2.

[0073] Furthermore, in the example of the present invention, the maximum displacement of the floorboard when a large impact force was assumed was 1.5 mm, and the maximum displacement of the floorboard when a small impact force was assumed was approximately 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 portion (distance L - plate thickness t) is greater than 0 mm and not more than 0.3 mm. This makes it easier to restrict the relative displacement between the underfloor installation member and the ceiling portion, regardless of whether the impact force is large or small, by having the first flat plate, which is displaced relative to the extension member, collide with the first large-diameter portion and the second large-diameter portion.

[0074] Although several embodiments of the present 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 implemented in various combinations as appropriate. Furthermore, the present invention can be implemented in various novel forms in addition to the above-described several embodiments. Therefore, various omissions, substitutions, and modifications are possible in each of the above-described several embodiments without departing from the spirit of the present invention. Such novel forms and modifications are included within the scope and spirit of the present invention, as well as within the scope of the inventions set forth in the claims and equivalents of the inventions set forth in the claims. [Explanation of symbols]

[0075] 1: Lightweight floor structure 2: Floorboards 3: Underfloor installation members 4: Joint material 7: Large beam 31: Upper flange 32: Lower flange 33: Web 41: Displacement control section 42: Extension member 43: 1st plate 43a: Through hole 44: First large diameter section 45: Second large diameter section 46:Latching part 46a: Claw part 46b: Plate part 47: Base 48: Nut 49: Cushioning material 411: Damper 5: Ceiling 6: Connecting member 91: Floor structure 92: Floorboards 93: Cross member 95: Ceiling 97: Large beam 98: Ceiling joists

Claims

1. A lightweight floor structure in a building having a lower floor and an upper floor, The floorboards of the upper floor portion; an underfloor installation member that is installed below the floor panel and supports the floor panel; A ceiling portion of the lower floor portion arranged below and spaced from the underfloor installation member; a connecting member that connects the underfloor installation member and the ceiling portion so as to be relatively displaceable in the up-down direction; A lightweight floor structure characterized by:

2. The connecting member has a displacement regulating portion that regulates relative displacement between the underfloor installation member and the ceiling portion.

2. The lightweight floor structure according to claim 1,

3. The displacement regulating portion is an extension member extending in the vertical direction; a first large-diameter portion formed to have a diameter larger than that of the through-hole of the first flat plate through which the extension member passes and disposed above the first flat plate; 3. The lightweight floor structure according to claim 2,

4. The displacement regulating portion is a second large-diameter portion formed to have a diameter larger than that of the through hole and disposed on the opposite side of the first large-diameter portion with the first flat plate interposed therebetween; The distance between the first large diameter portion and the second large diameter portion is greater than the thickness of the first flat plate.

4. The lightweight floor structure according to claim 3,

5. The displacement regulating portion further includes a hook portion that is hooked onto the underfloor installation member, The hook portion has the first flat plate.

5. The lightweight floor structure according to claim 3 or 4, characterized in that:

6. the displacement regulating portion further includes a base portion fixed to the ceiling portion, The base has the first plate.

5. The lightweight floor structure according to claim 3 or 4, characterized in that:

7. The displacement regulating portion further includes a buffer member disposed at least either between the first large diameter portion and the first flat plate or between the second large diameter portion and the first flat plate.

5. The lightweight floor structure according to claim 4,

8. The underfloor installation member has the first flat plate.

5. The lightweight floor structure according to claim 3 or 4, characterized in that:

9. The displacement regulating portion has a damper.

3. The lightweight floor structure according to claim 2,

10. The damper may include a rubber damper. The lightweight floor structure according to claim 9,

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