Bed structure

Abstract

To provide a floor structure that allows vibration isolation performance to be sufficiently exhibited for each of two conditions where two different weight loads are applied on panel members.SOLUTION: A floor structure in accordance with the present invention is provided with panel members, support members supporting the panel members, and elastic members arranged between the panel members and the support members. The elastic member is provided with a base part arranged on the support member and a protruded part protruding upward from the base part. The base has a predetermined spring constant to obtain specific vibration isolation performance in a condition where a first load is applied on the panel members, wherein a thick area including the protruded part of the elastic member and an area overlapped with the protruded part of the base part causes the panel member to contact the projected part in a condition where the panel member and the base part are separated from each other when a second load is applied on the panel members, to transfer the load to the whole of the base part including the thick area of the elastic member when the first load is applied on the panel members.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a floor structure of a building having earthquake-proof performance.

Background Art

[0002] For example, a floor structure described in Patent Document 1 is known in order to enhance the earthquake-proof performance of a building. This floor structure includes a beam, a floor panel supported by the beam, and an elastic member located between the beam and the floor panel and elastically deformed in the vertical direction. The hardness of this elastic member is set according to the weight of the floor panel in order to absorb the vibration of the floor panel. That is, when the weight of the floor panel is relatively large, the hardness of the elastic member becomes relatively large, and when the weight of the floor panel is relatively small, the hardness of the elastic member is set to be relatively small.

[0003] According to this floor structure, there is little possibility that the elastic member is compressed beyond the allowable value, and the vibration of the floor panel can be efficiently attenuated or made into a low frequency.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The hardness of such an elastic member is generally set not by a fixed load assumed as a load without members used in daily life such as furniture, but by a loading load assumed as a load with members used in daily life such as furniture.

[0006] However, when the hardness of the elastic member is set based on the live load, if a fixed load smaller than the live load is applied to the floor panel, the hardness of the elastic member may become greater than its original installation value, meaning the spring constant of the elastic member may become greater than the spring constant assumed at the time of setting. As a result, the natural frequency of the elastic member when a fixed load is applied to the floor panel may become higher than the assumed frequency, and it may not be able to provide sufficient vibration isolation performance against vibrations of the floor panel.

[0007] Furthermore, if the hardness of the elastic member is set based on the fixed load, it may exceed the allowable load (i.e., reach the elastic limit) before reaching the live load, causing the natural frequency of the elastic member to increase and reducing vibration isolation performance when a live load is applied.

[0008] This invention has been made in view of the above-mentioned problems, and aims to provide a floor structure that can fully exhibit vibration isolation performance in each of two states in which two different loads are applied to the panel member. [Means for solving the problem]

[0009] To solve the aforementioned problems, the floor structure according to the present invention comprises a panel member, a support member that supports the panel member, and an elastic member disposed between the panel member and the support member and elastically deformable in the vertical direction, wherein the elastic member comprises a base disposed on the support member and a projection that protrudes upward from the base, the base has a spring constant preset to obtain predetermined vibration damping performance when a first load is applied to the panel member, and the thickness region of the elastic member including the projection and the region of the base overlapping with the projection is such that when a second load smaller than the first load is applied to the panel member, the panel member and the projection are in contact with each other when the panel member and the base are separated, and when the first load is applied to the panel member, the load is transmitted to the entire base of the elastic member including the thickness region.

[0010] With this floor structure, when a second load is applied to the panel member, the panel member contacts the protruding portion while separated from the base. In other words, when a second load is applied, the spring constant of the thickness region can be effectively utilized, preventing the spring constant of the elastic member from becoming unnecessarily large for the expected load. As a result, the elastic member can ensure a spring constant that provides the required vibration isolation performance when a second load is applied to the panel member, thereby more effectively improving the vibration isolation performance of the floor structure.

[0011] Furthermore, when the first load is applied to the panel member, the load is transmitted to the entire base portion of the elastic member, including the thick region, allowing for effective utilization of the spring constant of the base. Therefore, when the first load is applied to the panel member, the elastic member can ensure a spring constant sufficient to exhibit the vibration isolation performance required for the floor structure, thereby more effectively improving the vibration isolation performance of the floor structure.

[0012] Furthermore, it is possible to suppress the exceeding of the allowable load (i.e., the elastic member reaching its elastic limit) before the load applied to the panel member reaches the first load, thereby suppressing the decrease in vibration isolation performance when the first load is applied.

[0013] In the floor structure described above, it is preferable that the base portion has a natural frequency below a predetermined frequency when the first load is applied to the panel member, and the thickness region has a natural frequency below the predetermined frequency when the second load is applied.

[0014] The natural frequency of an elastic member decreases as the load increases. Therefore, by configuring it as described above, the vibration frequency of the panel member can be suppressed to below a predetermined frequency when the panel member contacts the protruding portion and the load is transmitted to the base portion of the elastic member in a region other than the thickness region.

[0015] In the floor structure described above, it is preferable that the protruding portion has a constant cross-sectional area in the vertical direction, and that the upper surface of the protruding portion is parallel to the panel member.

[0016] With this configuration, the spring constant of the elastic member can be kept almost constant from the time the panel member and the protrusion come into contact (i.e., from the time the second load is applied) until the panel member begins to transmit the load to the base of the elastic member in a region other than the thickness region. Therefore, the spring constant of the elastic member can be easily controlled.

[0017] In the floor structure described above, it is preferable that the upper surface of the base is parallel to the panel member.

[0018] This configuration allows the spring constant of the elastic member to remain nearly constant after the panel member transmits the load to the base of the elastic member in a region other than the thickness region. Therefore, the spring constant of the elastic member can be easily controlled.

[0019] In this case, when a second load is applied to the panel member, the contact area with the elastic member is smaller than when a first load is applied to the panel member. Therefore, when a second load is applied to the panel member, there is a risk that the panel member may slip between the panel member and the protruding part due to an earthquake or other event.

[0020] Therefore, in the floor structure, it is preferable that the coefficient of static friction of the upper surface of the protruding portion is greater than the coefficient of static friction of the upper surface of the base portion.

[0021] In this configuration, when a second load is applied to the panel member, the panel member comes into contact with the protruding portion, which has a relatively high coefficient of static friction. Therefore, the frictional force acting between the panel member and the protruding portion can suppress the panel member from shifting away from the protruding portion, thereby improving the stability of the contact between the panel member and the protruding portion.

[0022] In the floor structure described above, it is preferable that the spring constant of the protruding portion is greater than the spring constant of the base portion.

[0023] According to this configuration, the protruding portion is harder than the base portion. That is, when the second load is applied to the panel member, in the thick region of the elastic member, the base portion is more easily elastically deformed than the protruding portion. Therefore, by controlling the spring constant of the base portion, the spring constant of the entire thick region can be easily controlled.

[0024] In the floor structure, it is preferable that the protruding portion is formed of highly damping rubber.

[0025] According to this configuration, the vibration of the panel member can be attenuated at the protruding portion. Therefore, the vibration isolation performance of the floor structure can be effectively improved.

[0026] In the floor structure, the elastic member has a damping member having a higher damping performance than the thick region in a region other than the region where the protruding portion protrudes on the base portion, and it is preferable that the damping member has a spring constant smaller than that of the thick region and the protruding portion.

[0027] According to this configuration, the vibration of the panel member can be effectively attenuated by the damping member.

[0028] Further, the damping member has a spring constant smaller than that of the thick region and the protruding portion. Therefore, the elastic force of the damping member is smaller than the elastic forces of the thick region and the protruding portion, and it is possible to suppress the damping member from interfering with vibration isolation.

Effects of the Invention

[0029] As described above, according to the floor structure of the present invention, it is possible to provide a floor structure that can sufficiently exhibit vibration isolation performance for each of two states in which two different loads are applied to the panel member.

Brief Description of the Drawings

[0030] [Figure 1] It is a perspective view showing a main part of a floor structure according to an embodiment of the present invention. [Figure 2]This is a perspective view showing the state in which the elastic member relating to the floor structure is positioned on the upper surface of the support member. [Figure 3] This is a cross-sectional view taken along line III-III in Figure 1, showing the panel member with a fixed load applied. [Figure 4] Figure 1, section III-III, shows the state in which a load is applied to the panel member. [Figure 5] This is a plan view showing the state in which the elastic member supports the panel member from below. [Figure 6] This is a diagram corresponding to Figure 3 of a floor structure according to a second embodiment of the present invention. [Figure 7] This is a diagram corresponding to Figure 4 of a floor structure according to a second embodiment of the present invention. [Figure 8] This figure corresponds to Figure 5 of a floor structure according to a modified example of the present invention. [Figure 9] This graph shows the relationship between the load applied to the panel member and the natural frequency of the elastic member. [Modes for carrying out the invention]

[0031] [First Embodiment] Hereinafter, a floor structure 1 according to the first embodiment of the present invention will be described with reference to the drawings.

[0032] Floor structure 1 is, for example, a component of the floor of a steel-framed house. In this embodiment, the case in which floor structure 1 is applied to a steel-framed house is described, but the type of house to which floor structure 1 can be applied is not limited to steel-framed houses; it may also be a wooden house or a concrete house.

[0033] As shown in Figures 1 and 2, the floor structure 1 comprises a plurality of plate-shaped panel members 40 that constitute the floor surface of the upper floor, a support member 10 fixed to the interior wall of the house and supporting the panel members 40, and an elastic member 30 positioned between the panel members 40 and the support member 10 and elastically deformable in the vertical direction.

[0034] The panel members 40 are slab materials that are approximately rectangular in shape when viewed from above, and are arranged adjacent to each other along a predetermined direction (hereinafter referred to as the left-right direction, and the direction perpendicular to this direction referred to as the front-back direction). Examples of panel members 40 include floor slabs, ALC, and hollow extruded cement boards in which sand-like inorganic material is filled in the hollow part. A single panel member 40 is placed on a support member 10 via four elastic members 30 that are spaced apart from each other in the front-back and left-right directions. Specifically, a single panel member 40 is supported by elastic members 30 at its four corners (four-point support).

[0035] As shown in Figure 2, the support member 10 includes a plurality of first beams 12 that extend in the left-right direction and are spaced apart from each other in the front-rear direction, and a plurality of second beams 14 that extend in the front-rear direction and are spaced apart from each other in the left-right direction. The longitudinal (front-rear direction) ends of the second beams 14 are connected to the sides of two adjacent first beams 12. In this state, the upper surfaces of the first beams 12 and the upper surfaces of the second beams 14 are flush.

[0036] The first beam 12 is an H-shaped steel member composed of a web and a pair of upper and lower flanges provided at both ends of the web in the vertical direction, and is fixed to a column (not shown) by welding or the like. The two first beams 12, which are aligned in the front-to-back direction, support the panel member 40 from both ends in the front-to-back direction, as shown in Figure 1.

[0037] The second beam 14, like the first beam 12, is an H-shaped steel member composed of a web and a pair of upper and lower flanges provided at both ends of the web in the vertical direction. Two second beams 14 adjacent to each other in the left-right direction are provided below both the left and right ends of the panel member 40, supporting the panel member 40 from both ends.

[0038] The second beam 14 is positioned so as to straddle the opposing ends of two adjacent panel members 40 in the left-right direction.

[0039] The elastic member 30 is a vibration-damping material that elastically deforms vertically in response to an upward load on the panel member 40, thereby reducing the frequency of vibrations transmitted to the panel member 40. Specifically, as shown in Figure 2, the elastic member 30 is composed of a base portion 32 placed on the support member 10 and a projection portion 34 that protrudes upward from the base portion 32.

[0040] As shown in Figure 3, the thickness region of the elastic member 30, including the protruding portion 34 and the area of ​​the base portion 32 that overlaps with the protruding portion 34, is such that when a fixed load P1 (corresponding to the "second load" of the present invention), which is assumed to be a load when no living materials such as furniture are placed on the panel member 40, is applied, the panel member 40 and the protruding portion 34 are in contact with each other while the panel member 40 and the base portion 32 are separated. As shown in Figure 4, when a load P3 (corresponding to the "first load" of the present invention), which is assumed to be a load when living materials such as furniture are placed on the panel member 40, is applied, the load P3 is transmitted to the entire base portion 32 of the elastic member 30, including the thickness region.

[0041] In this embodiment, when a load P3 is applied to the panel member 40, the load P3 is transmitted to the entire base 32 by contact between the upper surface of the base 32 in the thin region of the elastic member 30 (a region other than the thick region) and the lower surface of the panel member 40.

[0042] Multiple elastic members 30 (four in this embodiment) are provided for each panel member 40. Specifically, as shown in Figure 2, the elastic members 30 are positioned on the upper surface of the upper flange of the first beam 12 so as to support the four corners of the panel member 40 from below (four-point support for the panel member 40).

[0043] As shown in Figure 2, the elastic member 30 is divided into an elastic member 30A that supports the left end of the panel member 40 from below, and an elastic member 30B that supports the right end of the panel member 40 from below.

[0044] The thick region has a natural frequency below a predetermined frequency (for example, around 40 Hz) when a fixed load P1 is applied to the panel member 40.

[0045] The base 32 is a block material that supports the panel member 40 and is molded from a synthetic resin such as polyurethane or rubber. The base 32 is placed on the upper surface of the first beam 12 by double-sided tape or adhesive, and has a spring constant that is set in advance to obtain a predetermined vibration isolation performance when a live load P3 is applied to the panel member 40. Specifically, as shown in Figure 9, the base 32 has a natural frequency S that is set to be below a predetermined frequency (around 40 Hz) when a load in the load range M of fixed load P1 to live load P3 is applied to the panel member 40. In other words, when a load in the load range M is applied to the base 32, the natural frequency of the base 32 becomes below a predetermined frequency (around 40 Hz), and the floor structure 1 can exhibit a predetermined vibration isolation performance.

[0046] The base portion 32 has a constant cross-sectional area in the vertical direction in order to keep the spring constant approximately constant under load. In addition, the upper surface of the base portion 32 is parallel to the lower surface of the panel member 40.

[0047] The protruding portion 34 is formed from a sheet of high-damping rubber to effectively dampen the vibration energy transmitted to the panel member 40. However, the protruding portion 34 does not necessarily have to be formed from high-damping rubber and may be made of the same material as the base portion 32.

[0048] As shown in Figure 5, the protruding portion 34 is positioned along the upper surface of the base portion 32, on the end of the panel member 40 that is outward in the left-right direction, in order to support the left-right outer end of the panel member 40. When a fixed load P1 is applied to the panel member 40, a space is formed between the upper surface of the base portion 32 on the side opposite to where the protruding portion 34 is located (the side inward in the left-right direction relative to the panel member 40) and the panel member 40, as shown in Figure 3.

[0049] When the panel member 40 is subjected to an impact, the portion of the panel member 40 between adjacent protrusions 34 in the left-right direction will bend downward with the protrusions 34 as fulcrums, and may come into contact with the upper surface of the base 32 under a load smaller than the expected load P2 within the load range M. Therefore, as described above, by forming a space between the end of the base 32 that is inward in the left-right direction relative to the panel member 40 and the panel member 40, when the middle portion of the panel member 40 in the left-right direction is bent due to the load, the panel member 40 can be allowed to move into the space on the upper surface of the base 32. As a result, it is possible to suppress the panel member 40 from coming into contact with the upper surface of the base 32 under a load smaller than the expected load P2.

[0050] Furthermore, the protrusions 34 may be positioned along the outer edge of the panel member 40 in the front-rear direction on the upper surface of the base 32 in order to support the outer edge of the panel member 40 in the front-rear direction (for example, the reference numerals 32 and 34 may be swapped in Figure 8). In this embodiment, where the distance between adjacent protrusions 34 (pivot points) in the front-rear direction is greater than the distance in the left-right direction, the amount of deflection of the panel member 40 in the front-rear direction is greater than the amount of deflection of the panel member 40 in the left-right direction, so the panel member 40 can be effectively moved into the space on the upper surface of the base 32.

[0051] The protrusions 34 are positioned to support the four corners of the panel member 40 from below. When a fixed load P1 is applied to the panel member 40, the protrusions 34, positioned in this manner, support the four corners of the panel member 40 (i.e., provide four-point support).

[0052] The protrusion 34 has a constant cross-sectional area in the vertical direction in order to keep the spring constant approximately constant under load. The upper surface of the protrusion 34 is parallel to the lower surface of the panel member 40.

[0053] Furthermore, the static friction coefficient of the upper surface of the protruding portion 34 is set to be greater than the static friction coefficient of the upper surface of the base portion 32 in order to suppress sliding of the panel member 40 due to earthquakes or the like.

[0054] Furthermore, the spring constant of the protrusion 34 is made greater than that of the base 32 in order to facilitate the control of the spring constant of the entire thickness region. In other words, the protrusion 34 is made harder than the base 32. The spring constant (hardness) of the base 32 and the protrusion 34 can be set, for example, by changing the foaming ratio (density), or by changing the material or grade (material composition).

[0055] (Movement of elastic members) The operation of the elastic member 30 when a load is applied to the panel member 40 will be explained below with reference to Figures 3, 4, and 9.

[0056] In Figure 9, curve S represents the natural frequency for the load at the base 32, and curve K represents the natural frequency for the load in the thick region.

[0057] Figure 3 shows the panel member 40 with a fixed load P1 applied. In this state, the lower surface of the panel member 40 is separated from the upper surface of the base 32 and in contact with the upper surface of the protrusion 34 (i.e., the upper surface of the thickness region). At this time, the natural frequency of the base 32 is below the target predetermined frequency (around 40 Hz), as shown in the natural frequency section of Figure 9.

[0058] As the magnitude of the load applied to the panel member 40 increases from this state, the thickness region of the elastic member 30 undergoes elastic deformation downward (the spring constant remains constant). At this time, the natural frequency of the base 32 decreases along the curve K, as shown in Figure 9.

[0059] Furthermore, when a load P2 greater than the fixed load P1 is applied to the panel member 40, the thick region of the elastic member 30 elastically deforms, and as shown in Figure 4, the upper surface of the thick region (the upper surface of the protruding portion 34) lowers to the position of the upper surface of the base portion 32 in the thin region, causing the panel member 40 to come into contact with the upper surface of the thin region (the upper surface of the base portion 32) and the upper surface of the thick region (the upper surface of the protruding portion 34).

[0060] In this state, the frequency characteristics of the elastic member 30 switch from the natural frequency K of the protruding portion 34 to the natural frequency S of the base portion 32.

[0061] Here, as described above, since a thickness region with a low natural frequency K is adopted when a fixed load P1 is applied, creep may occur in the elastic member when a load greater than the limit load P2 is applied, and it may not be able to perform its function as an elastic member. If it loses its function as an elastic member, the natural frequency will increase rapidly, and the target vibration isolation performance cannot be achieved.

[0062] In contrast, as described above, the frequency characteristics switch, and although the natural frequency of the elastic member 30 temporarily increases as shown in Figure 9, the elasticity of the base 32 itself is not impaired. Therefore, it is possible to continue improving vibration isolation performance in response to further increases in load.

[0063] In this embodiment, the elastic member 30, under the applied load P2, has a natural frequency at which its thickness region reaches the limit value for which it can function as a vibration damper. This is to ensure that the loss of function of the elastic member 30 is prevented while minimizing the increase in the natural frequency when switching the frequency characteristics.

[0064] (Effects and Benefits) According to the floor structure 1 of this embodiment, when a fixed load P1 is applied to the panel member 40, the panel member 40 contacts the protruding portion 34 while separated from the base portion 32. In other words, when a fixed load P1 is applied, the spring constant of the thickness region can be effectively utilized to prevent the spring constant of the elastic member 30 from becoming larger than the spring constant assumed at the time of setting. As a result, the elastic member 30 can ensure a spring constant that can exhibit a predetermined vibration damping performance when a fixed load P1 is applied to the panel member 40, and the vibration damping performance of the floor structure 1 can be improved more effectively.

[0065] Furthermore, when a load P3 is applied to the panel member 40 from load P2, the thick region of the elastic member 30 elastically deforms, causing the panel member 40 to come into contact with the upper surface of the thick region (the upper surface of the protrusion 34) and the upper surface of the thin region (the upper surface of the base 32), thereby transmitting the load P3 to the base 32. This allows the spring constant of the base 32 in the thin region to be effectively utilized. Consequently, when a load P3 is applied to the panel member 40, the elastic member 30 can ensure a spring constant sufficient to exhibit the vibration isolation performance required for the floor structure 1, thereby more effectively improving the vibration isolation performance of the floor structure 1.

[0066] The elastic member 30 has the characteristic that its natural frequency decreases as the load increases. In this embodiment, the base 32 has a natural frequency of a predetermined frequency (around 40 Hz) or less when a load M of magnitude greater than or equal to a fixed load P1 and less than or equal to a live load P3 is applied to the panel member 40. Therefore, when the panel member 40 comes into contact with the base 32 and the protruding portion 34, the resonance frequency of the vibration of the panel member 40 can be suppressed to a frequency below the predetermined frequency (around 40 Hz).

[0067] Furthermore, the protruding portion 34 has a constant cross-sectional area in the vertical direction, and its upper surface is parallel to the lower surface of the panel member 40.

[0068] Therefore, the spring constant of the elastic member 30 can be kept almost constant from the time the panel member 40 comes into contact with the protrusion 34 until the panel member 40 comes into contact with the base 32. As a result, the spring constant of the elastic member 30 can be easily controlled.

[0069] Furthermore, the upper surface of the base portion 32 is parallel to the lower surface of the panel member 40.

[0070] Therefore, the spring constant of the elastic member 30 can be kept almost constant after the panel member 40 and the base 32 come into contact. As a result, the spring constant of the elastic member 30 can be easily controlled.

[0071] In this case, when a fixed load P1 is applied to the panel member 40, the contact area becomes smaller compared to when a live load P3 is applied to the panel member 40. Therefore, when a fixed load P1 is applied to the panel member 40, there is a risk that the panel member 40 may slip between the panel member 40 and the protruding portion 34 due to an earthquake or other event.

[0072] Therefore, in the floor structure 1, the static friction coefficient of the upper surface of the protruding portion 34 is set to be equal to or greater than the static friction coefficient of the upper surface of the base portion 32.

[0073] In this configuration, when a fixed load P1 is applied to the panel member 40, the panel member 40 comes into contact with the protrusion 34, which has a relatively large coefficient of static friction. Therefore, the frictional force acting between the panel member 40 and the protrusion 34 can suppress the displacement of the panel member 40 from the protrusion 34, thereby improving the stability of the contact between the panel member 40 and the protrusion 34.

[0074] Furthermore, the spring constant of the protruding portion 34 is equal to or greater than that of the base portion 32, and the spring constant of the thick region is greater than that of the base portion 32.

[0075] Therefore, the protruding portion 34 is harder than the base portion 32. In other words, when a fixed load P1 is applied to the panel member 40, the base portion 32 deforms elastically more easily than the protruding portion 34 in the thickness region of the elastic member 30. For this reason, by controlling the spring constant of the base portion 32, the spring constant of the entire thickness region can be easily controlled.

[0076] Furthermore, it is possible to suppress the load applied to the panel member from exceeding the allowable load (i.e., the elastic member 30 reaching its elastic limit) before the load P3 is reached, thereby suppressing the decrease in vibration isolation performance when the load P3 is applied.

[0077] Furthermore, the protruding portion 34 is formed of high-damping rubber. Therefore, vibrations of the panel member 40 can be damped at the protruding portion 34. As a result, the vibration isolation performance of the floor structure 1 can be effectively improved. The protruding portion 34 is preferably in the form of a sheet or plate, which makes it easy to control its thickness.

[0078] [Second Embodiment] The following describes the floor structure 100 according to the second embodiment of the present invention, focusing on the differences from the floor structure 1 of the first embodiment.

[0079] As shown in Figures 6 and 7, the floor structure 100 of the second embodiment differs from the floor structure 1 in that it uses an elastic member 130 that includes a damping member 36 for damping vibrations of the panel member 40, instead of the elastic member 30. Specifically, the elastic member 130 has a base portion 32, a protrusion 34 disposed on the upper surface of the base portion 32, and a damping member 36 disposed in the region of the base portion 32 other than the region overlapping with the protrusion 34.

[0080] The elastic member 130, like the elastic member 30, is divided into an elastic member 130A that supports the left end of the panel member 40 from below, and an elastic member 130B that supports the right end of the panel member 40 from below.

[0081] The damping member 36 has a higher damping performance than the thickness region of the elastic member 130, which includes the region of the base 32 where the protrusion 34 overlaps with the protrusion 34, in order to effectively absorb vibrations of the panel member 40, and has a spring constant smaller than the spring constant of the thickness region and the spring constant of the protrusion 34.

[0082] Figure 6 shows the state in which a fixed load P1 is applied to the upper surface of the panel member 40. In this state, the lower surface of the panel member 40 is in contact with the upper surface of the protrusion 34 and the upper surface of the damping member 36.

[0083] At this time, the spring constant of the damping member 36 is smaller than the spring constant of the thick region and the spring constant of the protruding portion 34, so it is possible to suppress the influence of the fixed load P1 on the region of the base 32 other than the region overlapping with the protruding portion 34.

[0084] As the load applied to the panel member 40 increases from this state, the damping member 36 elastically deforms and hardens, as shown in Figure 7. The load P3 applied to the panel member 40 is transmitted to the base 32 via this hardened damping member 36.

[0085] (Effects and Benefits) The elastic member 130 has a damping member 36 in the region other than the region overlapping with the protruding portion 34 of the base portion 32, which has a higher damping performance than the thickness region. Therefore, the damping member 36 can effectively dampen the vibration of the panel member 40.

[0086] Furthermore, the damping member 36 has a smaller spring constant than the thick region and the protruding portion 34. Therefore, the elastic force of the damping member 36 is smaller than the elastic force of the thick region and the protruding portion 34, which helps to prevent the damping member 36 from hindering vibration isolation.

[0087] (modified version) The embodiments described above are merely illustrative examples of preferred specifics of the present invention, and the present invention is not limited to these embodiments.

[0088] In the embodiments described above, a first beam 12 and a second beam 14 made of steel were used as the support members 10, but the beams that can be used as the support members 10 are not limited to these. For example, a wooden beam may be used as the support member 10.

[0089] Furthermore, the support member 10 may be composed of a first beam 12 and a second beam 14, or it may be composed of the first beam 12 with the second beam 14 omitted.

[0090] In the embodiments described above, an elastic member 30 composed of a base portion 32 and a protruding portion 34 was used, but the elastic member that can be used is not limited to such an elastic member 30. For example, an elastic member in which the base portion and the protruding portion are integrally formed may be used as the elastic member.

[0091] In each of the embodiments described above, four elastic members 30 were installed on a single panel member 40. However, the number of elastic members 30 is not limited to four, as long as they can stably absorb the vibrations of the panel member 40. For example, an additional elastic member 30 may be installed between the left and right elastic members 30A and 30B, for a total of six elastic members 30.

[0092] Furthermore, the location where the elastic member 30 is installed is not limited to the upper surface of the upper flange of the first beam 12, but may also be installed on the upper surface of the upper flange of the second beam 14, or on the upper surfaces of the upper flanges of both the first beam 12 and the second beam 14.

[0093] In the first embodiment described above, the protrusions 34 are positioned on the left-right outer ends of the base 32, and a space is formed on the left-right inner ends of the base 32. However, the positional relationship between these protrusions 34 and the space may be reversed. That is, the protrusions 34 may be positioned on the left-right inner ends of the base 32, and a space may be formed on the left-right outer ends of the base 32. Also, as shown in the elastic member 320 in Figure 8, the protrusions 34 may be positioned on the front-rear inner ends of the base 32. Furthermore, the two protrusions 34, 34 may be positioned spaced apart from each other in the left-right direction, and a space may be formed between these protrusions 34, 34 on the upper surface of the base 32. The same applies to the relationship between the protrusions 34 and the damping member 36 in the second embodiment described above.

[0094] Needless to say, various design modifications are possible within the scope of the claims of this invention. [Explanation of symbols]

[0095] 1 floor structure 10 Support member 30 Elastic members 32 Base 34 Protrusion 40 Panel components

Claims

1. It is a floor structure, Panel members and A support member that supports the panel member, The system comprises an elastic member disposed between the panel member and the support member and which is elastically deformable in the vertical direction, The elastic member comprises a base portion disposed on the support member and a projection portion projecting upward from the base portion. The base has a spring constant that is set in advance to obtain a predetermined vibration damping performance when a first load is applied to the panel member. The thickness region of the elastic member, including the protruding portion and the portion of the base that overlaps with the protruding portion, exhibits vibration damping performance when a second load smaller than the first load is applied to the panel member, and the panel member and the base are separated while the panel member and the protruding portion are in contact. When a load greater than or equal to a predetermined load, which is set in advance as a load between the first load and the second load that can exhibit vibration damping performance in the thickness region, is applied to the panel member, the entire base portion of the elastic member, including the thickness region, comes into contact with the panel member, and the load is transmitted to the entire base portion, thereby exhibiting vibration damping performance in the entire load region from the second load to the first load. Only one of the aforementioned protrusions is provided. The lower surface of the base is a flat surface positioned on the upper surface of the support member along the upper surface of the support member, such that the load generated on the base in the entire load region can be transmitted to the support member through the lower surface of the base. A floor structure in which the upper surface of the base, the lower surface of the base, and the upper surface of the protruding portion are parallel to the panel member.

2. In the floor structure described in claim 1, The base portion has a natural frequency below a predetermined frequency when the first load is applied to the panel member. The aforementioned thickness region is a floor structure having a natural frequency below the predetermined frequency when a second load is applied.

3. In the floor structure according to claim 1 or 2, The aforementioned protruding portion is a floor structure having a constant cross-sectional area in the vertical direction.

4. A floor structure according to any one of claims 1 to 3, wherein the predetermined load is the limit load of the vibration isolation performance in the thickness region.

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