JP7635522B2 - Floor structure - Google Patents

Description

The present invention relates to a floor structure for a building that has vibration isolation capabilities.

For example, a floor structure described in Patent Document 1 is known to improve the vibration isolation performance of a building. This floor structure comprises beams, floor panels supported by the beams, and elastic members that are located between the beams and the floor panels and elastically deform 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. In other words, when the weight of the floor panel is relatively large, the hardness of the elastic member is set to be 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.

This floor structure reduces the risk of the elastic member being compressed beyond the allowable value, and can efficiently attenuate or reduce the frequency of vibrations in the floor panel.

Patent No. 6428840

The hardness of such elastic members is generally set based on the load assumed when furniture or other members used in daily life are attached, rather than on a fixed load assumed when furniture or other members used in daily life are not attached.

However, when the hardness of the elastic member is set based on the live load, when a fixed load smaller than the live load is applied to the floor panel, the hardness of the elastic member becomes greater than the original setting value, i.e., the spring constant of the elastic member becomes 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 becomes higher than the assumed frequency, and there are cases where the elastic member is unable to exhibit sufficient vibration isolation performance against vibrations of the floor panel.

In addition, if the hardness of the elastic member is set based on a fixed load, the allowable load may be exceeded (i.e., the elastic limit may be reached) before the load load is reached, increasing the natural frequency of the elastic member and causing a decrease in vibration-damping performance when the load load is applied.

The present invention was made in consideration of the above problems, and aims to provide a floor structure that can fully demonstrate vibration isolation performance in each of two states in which two different loads are applied to a panel member.

In order to solve the above problem, the floor structure of the present invention comprises a panel member, a support member that supports the panel member, and an elastic member that is disposed between the panel member and the support member and elastically deforms in the vertical direction, the elastic member comprises a base that is disposed on the support member and a protruding portion that protrudes upward from the base, the base has a spring constant that is preset to obtain a predetermined vibration-proofing performance in a state in which a first load is applied to the panel member, a thick region including the protruding portion in the elastic member and a region of the base that overlaps with the protruding portion is such that when a second load smaller than the first load is applied to the panel member, the panel member and the protruding portion come into contact with each other in a state in which the panel member and the base are spaced apart, and when the first load is applied to the panel member , a load is transmitted to the entire base including the thick region of the elastic member, the first load is set to a live load assumed as a load when a member used in daily life is provided, and the second load is set to a fixed load assumed as a load when the member used in daily life is not provided .

According to this floor structure, when a second load is applied to the panel member, the panel member comes into contact with the protrusion while separated from the base. In other words, when the second load is applied, the spring constant of the thick region is effectively utilized to prevent the spring constant of the elastic member from becoming larger than necessary for the expected load. Therefore, the elastic member can ensure a spring constant that can provide a predetermined vibration-proofing performance when the second load is applied to the panel member, and the vibration-proofing performance of the floor structure can be improved more effectively.

In addition, when a first load is applied to the panel member, the load is transmitted to the entire base of the elastic member, including the thick region, so the spring constant of the base can be effectively utilized. Therefore, the elastic member can ensure a spring constant that can provide the vibration-proofing performance required of the floor structure when the first load is applied to the panel member, and the vibration-proofing performance of the floor structure can be more effectively improved.

In addition, it is possible to prevent the load applied to the panel member from exceeding the allowable load (i.e., the elastic member from reaching its elastic limit) before reaching the first load, and it is possible to prevent a decrease in vibration-damping performance when the first load is applied.

In the floor structure, it is preferable that the base has a natural frequency equal to or lower than a predetermined frequency when the first load is applied to the panel member, and the thick region has a natural frequency equal to or lower than the predetermined frequency when the second load is applied.

The natural frequency of the elastic member has the characteristic that the greater the load, the smaller the natural frequency. Therefore, by configuring as described above, the vibration frequency of the panel member can be suppressed to less than a predetermined frequency when the panel member comes into contact with the protruding portion and the load is transmitted to the base of the elastic member in the region other than the thick region.

In the floor structure, it is preferable that the protrusion has a constant cross-sectional area in the vertical direction, and the upper surface of the protrusion is parallel to the panel member.

This configuration makes it possible to keep the spring constant of the elastic member almost constant from the time when the panel member comes into contact with the protruding portion (i.e., when the second load is applied) until the panel member starts to transmit the load to the base in the region of the elastic member other than the thick region. This makes it easy to manage the spring constant of the elastic member.

In the floor structure, it is preferable that the upper surface of the base is parallel to the panel member.

This configuration allows the spring constant of the elastic member to be kept almost constant after the panel member transmits a load to the base in the region of the elastic member other than the thick region. This makes it easy to manage the spring constant of the elastic member.

When the second load is applied to the panel member, the contact area with the elastic member is smaller than when the first load is applied to the panel member. Therefore, when the second load is applied to the panel member, there is a risk that the panel member may slip between the panel member and the protrusion due to an earthquake, etc.

Therefore, the present invention provides a floor structure comprising a panel member, a support member supporting the panel member, and an elastic member that is disposed between the panel member and the support member and elastically deforms in the vertical direction, the elastic member comprises a base disposed on the support member and a protruding portion protruding upward from the base, the base has a preset spring constant for obtaining a predetermined vibration-proofing performance in a state in which a first load is applied to the panel member, a thick region including the protruding portion in the elastic member and a region of the base that overlaps with the protruding portion is such that when a second load smaller than the first load is applied to the panel member, the panel member and the protruding portion come into contact with each other in a state in which the panel member and the base are separated from each other, and when the first load is applied to the panel member, a load is transmitted to the entire base including the thick region of the elastic member, and the static friction coefficient of an upper surface of the protruding portion is greater than the static friction coefficient of an upper surface of the base.

According to this floor structure, when the second load is applied to the panel member, the panel member comes into contact with the protruding portion while separated from the base. In other words, when the second load is applied, the spring constant of the thick region is effectively utilized to prevent the spring constant of the elastic member from becoming larger than necessary for the expected load. Therefore, the elastic member can ensure a spring constant that can provide a predetermined vibration-proof performance when the second load is applied to the panel member, and the vibration-proof performance of the floor structure can be improved more effectively.
In addition, when the first load is applied to the panel member, the load is transmitted to the entire base portion including the thick region of the elastic member, so that the spring constant of the base portion can be effectively utilized. Therefore, the elastic member can ensure a spring constant that can provide the vibration isolation performance required for the floor structure when the first load is applied to the panel member, and the vibration isolation performance of the floor structure can be more effectively improved.
In addition, it is possible to prevent the load applied to the panel member from exceeding the allowable load (i.e., the elastic member reaching its elastic limit) before reaching the first load, and it is possible to prevent a decrease in vibration-damping performance when the first load is applied.
Furthermore, according to this configuration, when the second load is applied to the panel member, the panel member comes into contact with the protruding portion having a relatively large static friction coefficient, and therefore, the frictional force acting between the panel member and the protruding portion can prevent the panel member from slipping off the protruding portion, thereby improving stability when the panel member comes into contact with the protruding portion.

The present invention provides a floor structure comprising a panel member, a support member supporting the panel member, and an elastic member disposed between the panel member and the support member and elastically deformable in the vertical direction, the elastic member comprising a base disposed on the support member and a protrusion protruding upward from the base, the base having a preset spring constant for obtaining a predetermined vibration-proofing performance in a state in which a first load is applied to the panel member, a thick region including the protrusion in the elastic member and a region of the base overlapping with the protrusion, when a second load smaller than the first load is applied to the panel member, the panel member and the protrusion come into contact with each other in a state in which the panel member and the base are separated from each other, and when the first load is applied to the panel member, a load is transmitted to the entire base including the thick region of the elastic member, and in the floor structure, the spring constant of the protrusion is greater than the spring constant of the base .

According to this floor structure, when the second load is applied to the panel member, the panel member comes into contact with the protruding portion while separated from the base. In other words, when the second load is applied, the spring constant of the thick region is effectively utilized to prevent the spring constant of the elastic member from becoming larger than necessary for the expected load. Therefore, the elastic member can ensure a spring constant that can provide a predetermined vibration-proof performance when the second load is applied to the panel member, and the vibration-proof performance of the floor structure can be improved more effectively.
In addition, when the first load is applied to the panel member, the load is transmitted to the entire base portion including the thick region of the elastic member, so that the spring constant of the base portion can be effectively utilized. Therefore, the elastic member can ensure a spring constant that can provide the vibration isolation performance required for the floor structure when the first load is applied to the panel member, and the vibration isolation performance of the floor structure can be more effectively improved.
In addition, it is possible to prevent the load applied to the panel member from exceeding the allowable load (i.e., the elastic member reaching its elastic limit) before reaching the first load, and it is possible to prevent a decrease in vibration-damping performance when the first load is applied.
Furthermore, with this configuration, the protruding portion is harder than the base portion. That is, when the second load is applied to the panel member, the base portion elastically deforms more easily than the protruding portion in the thick region of the elastic member. Therefore, by controlling the spring constant of the base portion, the spring constant of the entire thick region can be easily controlled.

In the floor structure, it is preferable that the protrusion is made of high-damping rubber.

This configuration allows vibrations of the panel member to be damped at the protruding portion, effectively improving the vibration-proofing performance of the floor structure.

The present invention is a floor structure comprising a panel member, a support member supporting the panel member, and an elastic member disposed between the panel member and the support member and elastically deformable in the up-down direction, the elastic member comprising a base disposed on the support member and a protruding portion protruding upward from the base, the base having a spring constant preset for obtaining a predetermined vibration-proofing performance in a state where a first load is applied on the panel member, and a thickness region including the protruding portion of the elastic member and a region of the base that overlaps with the protruding portion has a front The present invention provides a floor structure in which, when a second load smaller than the first load is applied to the panel member, the panel member and the protrusion come into contact with each other while the panel member and the base are spaced apart, and when the first load is applied to the panel member, the load is transmitted to the entire base including the thick region of the elastic member, and the elastic member has a damping member having high damping performance greater than that of the thick region in an area on the base other than the area where the protrusion protrudes, and the damping member has a spring constant smaller than that of the thick region and the protrusion .

According to this floor structure, when the second load is applied to the panel member, the panel member comes into contact with the protruding portion while separated from the base. In other words, when the second load is applied, the spring constant of the thick region is effectively utilized to prevent the spring constant of the elastic member from becoming larger than necessary for the expected load. Therefore, the elastic member can ensure a spring constant that can provide a predetermined vibration-proof performance when the second load is applied to the panel member, and the vibration-proof performance of the floor structure can be improved more effectively.
In addition, when the first load is applied to the panel member, the load is transmitted to the entire base portion including the thick region of the elastic member, so that the spring constant of the base portion can be effectively utilized. Therefore, the elastic member can ensure a spring constant that can provide the vibration isolation performance required for the floor structure when the first load is applied to the panel member, and the vibration isolation performance of the floor structure can be more effectively improved.
In addition, it is possible to prevent the load applied to the panel member from exceeding the allowable load (i.e., the elastic member reaching its elastic limit) before reaching the first load, and it is possible to prevent a decrease in vibration-damping performance when the first load is applied.
Furthermore, with this configuration, the vibration of the panel member can be effectively damped by the damping member.

In addition, the damping member has a smaller spring constant than the thick region and the protruding portion. Therefore, the elastic force of the damping member is smaller than the elastic force of the thick region and the protruding portion, and the damping member can be prevented from interfering with vibration damping.

As described above, the floor structure of the present invention can provide a floor structure that can fully demonstrate vibration isolation performance in each of two states in which two different loads are applied to the panel member.

FIG. 2 is a perspective view showing a main part of a floor structure according to an embodiment of the present invention. 10 is a perspective view showing a state in which an elastic member for the floor structure is disposed on an upper surface of a support member. FIG. 3 is a cross-sectional view taken along line III-III of FIG. 1, illustrating a state in which a fixed load is applied to the panel member. 1, showing a state in which a load is applied to the panel member. 11 is a plan view illustrating a state in which the elastic member supports the panel member from below. FIG. FIG. 4 is a view equivalent to FIG. 3 of a floor structure according to a second embodiment of the present invention. FIG. 5 is a view equivalent to FIG. 4 of a floor structure according to a second embodiment of the present invention. FIG. 6 is a view equivalent to FIG. 5 of a floor structure according to a modified example of the present invention. 4 is a graph showing the relationship between a load applied to the panel member and a natural frequency of the elastic member.

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

The floor structure 1 constitutes, for example, the floor of a steel-based house. In this embodiment, the floor structure 1 is described as being applied to a steel-based house, but the houses to which the floor structure 1 can be applied are not limited to steel-based houses, and may be wooden houses or concrete houses.

As shown in Figures 1 and 2, the floor structure 1 comprises a number of plate-shaped panel members 40 that form the floor surface of the upper floor, a support member 10 that is fixed to the interior wall of the house and supports the panel members 40, and an elastic member 30 that is disposed between the panel members 40 and the support member 10 and elastically deforms in the vertical direction.

The panel members 40 are slab materials that are approximately rectangular in plan view, and are arranged adjacent to each other along a specific direction (hereinafter, this will be referred to as the left-right direction, and the direction perpendicular to this will be referred to as the front-rear direction). For example, floor slabs, ALC, hollow extruded cement boards whose hollow portions are filled with sand-like inorganic matter, etc. are used as the panel members 40. One panel member 40 is placed on the support member 10 via four elastic members 30 that are spaced apart from each other in the front-rear and left-right directions. Specifically, one panel member 40 is supported by the elastic members 30 at the four corners (four-point support).

As shown in FIG. 2, the support member 10 includes a plurality of first beams 12 extending in the left-right direction and spaced apart from one another along the front-rear direction, and a plurality of second beams 14 extending in the front-rear direction and spaced apart from one another along the left-right direction. The longitudinal (front-rear) ends of the second beams 14 are connected to the side surfaces of two adjacent first beams 12. In this state, the top surfaces of the first beams 12 and the second beams 14 are flush with one another.

The first beam 12 is an H-shaped steel material consisting of a web and a pair of upper and lower flanges provided at both vertical ends of the web, and is fixed to a pillar (not shown) by welding or the like. The two first beams 12 aligned in the front-to-rear direction support the panel member 40 from both front-to-rear ends, as shown in FIG. 1.

The second beams 14, like the first beams 12, are H-shaped steel members consisting of a web and a pair of upper and lower flanges provided at both vertical ends of the web. The two second beams 14 adjacent in the left-right direction are provided below both the left and right ends of the panel member 40, and support the panel member 40 from both the left and right ends.

One second beam 14 is positioned so as to straddle the ends of two panel members 40 that are adjacent in the left-right direction and face each other.

The elastic member 30 is a vibration-proof material that elastically deforms in the vertical direction in response to a load applied from above to the panel member 40, thereby reducing the frequency of vibrations transmitted to the panel member 40. Specifically, as shown in FIG. 2, the elastic member 30 is composed of a base 32 that is placed on the support member 10, and a protrusion 34 that protrudes upward from the base 32.

The thick region including the protruding portion 34 in the elastic member 30 and the region of the base 32 that overlaps with the protruding portion 34 is configured so that when a fixed load P1 (corresponding to the "second load" of the present invention) is applied to the panel member 40, the panel member 40 and the protruding portion 34 come into contact with each other while the panel member 40 and the base 32 are spaced apart, and when a load P3 (corresponding to the "first load" of the present invention) is applied to the panel member 40, the load P3 is transmitted to the entire base 32 including the thick region of the elastic member 30, as shown in FIG. 4.

In this embodiment, when a load P3 is applied to the panel member 40, the upper surface of the base 32 in the thin region of the elastic member 30 other than the thick region comes into contact with the lower surface of the panel member 40, and the load P3 is transmitted to the entire base 32.

A plurality of elastic members 30 (four in this embodiment) are provided for each panel member 40. Specifically, as shown in FIG. 2, the elastic members 30 are arranged 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 (supporting the panel member 40 at four points).

As shown in FIG. 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.

The thick region has a natural frequency below a predetermined frequency (e.g., around 40 Hz) when a fixed load P1 is applied to the panel member 40.

The base 32 is a block material that supports the panel member 40, and is molded from synthetic resin such as polyurethane or rubber. The base 32 is placed on the upper surface of the first beam 12 with double-sided tape, adhesive, or the like, and has a spring constant that is preset to obtain a predetermined vibration-proofing performance when the load P3 is applied to the panel member 40. Specifically, as shown in FIG. 9, the base 32 has a natural frequency S that is set to be equal to or lower than a predetermined frequency (near 40 Hz) when a load of a load range M between the fixed load P1 and the load P3 is applied to the panel member 40. In other words, when a load of the load range M is applied to the base 32, the natural frequency of the base 32 becomes equal to or lower than a predetermined frequency (near 40 Hz), and the floor structure 1 can exhibit a predetermined vibration-proofing performance.

The base 32 has a constant cross-sectional area in the vertical direction to keep the spring constant almost constant against the load. In addition, the upper surface of the base 32 is parallel to the lower surface of the panel member 40.

The protrusion 34 is molded from a sheet of high-damping rubber to effectively dampen the energy of vibrations transmitted to the panel member 40. Note that the protrusion 34 does not need to be molded from high-damping rubber, and may be made from the same material as the base 32.

As shown in FIG. 5, the protrusion 34 is disposed along the outer left-right end of the upper surface of the base 32 relative to the panel member 40 in order to support the outer left-right 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 32 on the opposite side to the side on which the protrusion 34 is disposed (the inner left-right end relative to the panel member 40) and the panel member 40, as shown in FIG. 3.

When an impact is applied to the panel member 40, the portion between adjacent protrusions 34 in the left-right direction of the panel member 40 may bend downward with the protrusions 34 as a fulcrum, and may come into contact with the upper surface of the base 32 at a load smaller than the load P2 expected within the load range M. Therefore, as described above, by forming a space between the end of the base 32 on the left-right inner side relative to the panel member 40 and the panel member 40, the panel member 40 can be allowed to escape into the space on the upper surface of the base 32 when the middle part of the panel member 40 in the left-right direction is bent by the load. Therefore, it is possible to prevent the panel member 40 from coming into contact with the upper surface of the base 32 at a load smaller than the expected load P2.

In addition, the protrusions 34 may be arranged along the outer end of the panel member 40 in the front-to-rear direction on the upper surface of the base 32 in order to support the outer end of the panel member 40 in the front-to-rear direction (for example, the reference numerals 32 and 34 may be interchanged in FIG. 8). In this embodiment, in which the distance between adjacent protrusions 34 (supports) in the front-to-rear direction is greater than the distance in the left-to-right direction, the amount of bending of the panel member 40 in the front-to-rear direction is greater than the amount of bending of the panel member 40 in the left-to-right direction, so that the panel member 40 can effectively escape into the space on the upper surface of the base 32.

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

The protrusion 34 has a constant cross-sectional area in the vertical direction to keep the spring constant almost constant against the load. The upper surface of the protrusion 34 is parallel to the lower surface of the panel member 40.

The static friction coefficient of the upper surface of the protrusion 34 is set to be greater than the static friction coefficient of the upper surface of the base 32 to prevent the panel member 40 from slipping due to an earthquake or the like.

The spring constant of the protrusion 34 is made larger than that of the base 32 to facilitate management of the spring constant of the entire thick 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 is set, for example, by changing the foaming rate (density) or by changing the material or grade (material distribution).

(Operation of Elastic Member)
Hereinafter, the operation of the elastic member 30 when a load is applied to the panel member 40 will be described with reference to FIGS.

In FIG. 9, curve S shows the natural frequency for the load on the base 32, and curve K shows the natural frequency for the load on the thick region.

Figure 3 shows the state in which a fixed load P1 is applied to the panel member 40. In this state, the bottom surface of the panel member 40 is in contact with the top surface of the protrusion 34 (i.e., the top surface of the thick region) while being spaced from the top surface of the base 32. At this time, the natural frequency of the base 32 is equal to or lower than a target predetermined frequency (near 40 Hz), as shown by the natural frequency in Figure 9.

When the magnitude of the load applied to the panel member 40 increases from this state, the thick region of the elastic member 30 elastically deforms downward (the spring constant is constant). At this time, the natural frequency of the base 32 decreases along the curve K as shown in FIG. 9.

Furthermore, when a load P2 larger than the fixed load P1 is applied to the panel member 40, the thick region of the elastic member 30 elastically deforms, and the upper surface of the thick region (the upper surface of the protrusion 34) descends to the position of the upper surface of the base 32 in the thin region as shown in FIG. 4, and the panel member 40 comes into contact with the upper surface of the thin region (the upper surface of the base 32) and the upper surface of the thick region (the upper surface of the protrusion 34).

In this state, the frequency characteristics of the elastic member 30 switch from the natural frequency K of the protrusion 34 to the natural frequency S of the base 32.

As described above, a thick region is used that has a low natural frequency K when a fixed load P1 is applied, so when a load greater than the critical load P2 is applied, creep may progress in the elastic member, causing it to lose its function as an elastic member. If the elastic member loses its function, the natural frequency increases rapidly, and the target vibration-damping performance cannot be achieved.

In contrast, by switching the frequency characteristics as described above, the natural frequency of the elastic member 30 temporarily increases as shown in Figure 9, but the elasticity of the base 32 itself is not impaired, so that the vibration-damping performance can continue to improve as the load increases.

In this embodiment, when the load P2 is applied, the elastic member 30 has a natural frequency that is the limit value at which the thick region can function as a vibration-proof material. This is to minimize the increase in the natural frequency when the frequency characteristics are switched while reliably preventing the loss of function as the elastic member 30.

(Action and Effect)
According to the floor structure 1 of this embodiment, when the fixed load P1 is applied to the panel member 40, the panel member 40 comes into contact with the protruding portion 34 while separated from the base portion 32. In other words, when the fixed load P1 is applied, the spring constant of the thick region is 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. Therefore, when the fixed load P1 is applied to the panel member 40, the elastic member 30 can ensure a spring constant that can exhibit a predetermined vibration-proof performance, and the vibration-proof performance of the floor structure 1 can be improved more effectively.

In addition, when the load P2 is applied to the panel member 40, the thick region of the elastic member 30 elastically deforms, and the panel member 40 comes 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), transmitting the load P3 to the base 32, so that the spring constant of the base 32 in the thin region can be effectively utilized. Therefore, the elastic member 30 can ensure a spring constant that can exert the vibration-proofing performance required of the floor structure 1 when the load P3 is applied to the panel member 40, and the vibration-proofing performance of the floor structure 1 can be more effectively improved.

The natural frequency of the elastic member 30 has the characteristic that it decreases as the load increases. In this embodiment, when a load M that is equal to or greater than the fixed load P1 and equal to or less than the load load P3 is applied to the panel member 40, the base 32 has a natural frequency that is equal to or less than a predetermined frequency (near 40 Hz), so that the resonant frequency of the vibration of the panel member 40 can be suppressed to less than the predetermined frequency (near 40 Hz) when the panel member 40 comes into contact with the base 32 and the protruding portion 34.

In addition, the protrusion 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.

As a result, the spring constant of the elastic member 30 can be kept almost constant from the time when the panel member 40 comes into contact with the protruding portion 34 until the panel member 40 comes into contact with the base portion 32. This makes it easy to manage the spring constant of the elastic member 30.

In addition, the upper surface of the base 32 is parallel to the lower surface of the panel member 40.

As a result, 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. This makes it easy to manage the spring constant of the elastic member 30.

When the panel member 40 is subjected to a fixed load P1, the contact area is smaller than when the panel member 40 is subjected to a live load P3. Therefore, when the panel member 40 is subjected to a fixed load P1, 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 the like.

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

According to this configuration, when the fixed load P1 is applied to the panel member 40, the panel member 40 comes into contact with the protruding portion 34, which has a relatively large static friction coefficient. Therefore, the frictional force acting between the panel member 40 and the protruding portion 34 can prevent the panel member 40 from shifting from the protruding portion 34, improving the stability when the panel member 40 comes into contact with the protruding portion 34.

In addition, the spring constant of the protrusion 34 is equal to or greater than the spring constant of the base 32, and the spring constant of the thick region is greater than the spring constant of the base 32.

Therefore, the protrusion 34 is harder than the base 32. In other words, when a fixed load P1 is applied to the panel member 40, the base 32 elastically deforms more easily than the protrusion 34 in the thick region of the elastic member 30. Therefore, by managing the spring constant of the base 32, the spring constant of the entire thick region can be easily managed.

In addition, it is possible to prevent the load applied to the panel member from exceeding the allowable load (i.e., the elastic member 30 from reaching its elastic limit) before reaching the load P3, and to prevent a decrease in vibration-proofing performance when the load P3 is applied.

The protrusion 34 is also made of high-damping rubber. Therefore, the vibration of the panel member 40 can be damped at the protrusion 34. This effectively improves the vibration-proofing performance of the floor structure 1. The protrusion 34 is preferably in the form of a sheet or plate, which makes it easy to control the thickness.

Second Embodiment
The floor structure 100 according to the second embodiment of the present invention will be described below, focusing on the differences from the floor structure 1 according to the first embodiment.

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 including a damping member 36 that damps vibrations of the panel member 40 instead of the elastic member 30. Specifically, the elastic member 130 has a base 32, a protruding portion 34 disposed on the upper surface of the base 32, and a damping member 36 disposed in an area of the base 32 other than the area overlapping with the protruding portion 34.

Like elastic member 30, elastic member 130 is divided into elastic member 130A that supports the left end of panel member 40 from below, and elastic member 130B that supports the right end of panel member 40 from below.

The damping member 36 has a higher damping performance than the thick region including the protruding portion 34 of the elastic member 130 and the region of the base 32 where the protruding portion 34 overlaps, in order to effectively absorb vibrations of the panel member 40, and has a spring constant smaller than the spring constant of the thick region and the spring constant of the protruding portion 34.

Figure 6 shows a 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.

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 protrusion 34, so that the influence of the fixed load P1 on the areas of the base 32 other than the area overlapping with the protrusion 34 can be suppressed.

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

(Action and Effect)
The elastic member 130 has the damping member 36 having a higher damping performance than the thick region in the region other than the region overlapping with the protruding portion 34 in the base 32. Therefore, the vibration of the panel member 40 can be effectively damped by the damping member 36.

In addition, 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, and the damping member 36 is prevented from interfering with vibration damping.

(Modification)
The above-described embodiments are merely illustrative of preferred specific examples of the present invention, and the present invention is not limited to the above-described embodiments.

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

The support member 10 may be composed of a first beam 12 and a second beam 14, or may be composed of only the first beam 12 with the second beam 14 omitted.

In each of the above embodiments, an elastic member 30 composed of a base 32 and a protrusion 34 is 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 a base and a protrusion are integrally formed may be used as the elastic member.

In each of the above embodiments, four elastic members 30 are provided for one panel member 40, but the number of elastic members 30 is not limited to four as long as the vibrations of the panel member 40 can be stably absorbed. For example, a further elastic member 30 may be provided between the left and right elastic members 30A and 30B, resulting in a total of six elastic members 30.

In addition, 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 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 each of the first beam 12 and the second beam 14.

In the first embodiment, the protrusion 34 is disposed on the outer end of the base 32 in the left-right direction, and a space is formed on the inner end of the base 32 in the left-right direction, but the positional relationship between the protrusion 34 and the space may be reversed. That is, the protrusion 34 may be disposed on the inner end of the base 32 in the left-right direction, and a space may be formed on the outer end of the base 32 in the left-right direction. Also, as in the elastic member 320 of FIG. 8, the protrusion 34 may be disposed on the inner end of the base 32 in the front-rear direction. Furthermore, two protrusions 34, 34 may be disposed in a state separated 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. This also applies to the relationship between the protrusion 34 and the damping member 36 in the second embodiment.

Needless to say, various design modifications are possible within the scope of the present invention.

1 Floor structure 10 Support member 30 Elastic member 32 Base 34 Protruding portion 40 Panel member

Claims (4)

A floor structure comprising:
A panel member;
A support member for supporting the panel member;
an elastic member disposed between the panel member and the support member and elastically deformable in a vertical direction;
The elastic member includes a base portion disposed on the support member and a protrusion portion protruding upward from the base portion,
the base portion has a spring constant that is preset to obtain a predetermined vibration isolation performance in a state where a first load is applied on the panel member,
a thick region including the protrusion of the elastic member and a region of the base that overlaps with the protrusion, when a second load smaller than the first load is applied to the panel member, the panel member and the protrusion come into contact with each other in a state in which the panel member and the base are spaced apart, and when the first load is applied to the panel member, a load is transmitted to the entire base including the thick region of the elastic member,
A floor structure, wherein the static friction coefficient of an upper surface of the protrusion is greater than the static friction coefficient of an upper surface of the base. A floor structure comprising:
A panel member;
A support member for supporting the panel member;
an elastic member disposed between the panel member and the support member and elastically deformable in a vertical direction;
The elastic member includes a base portion disposed on the support member and a protrusion portion protruding upward from the base portion,
the base portion has a spring constant that is preset to obtain a predetermined vibration isolation performance in a state where a first load is applied on the panel member,
a thick region including the protrusion of the elastic member and a region of the base that overlaps with the protrusion, when a second load smaller than the first load is applied to the panel member, the panel member and the protrusion come into contact with each other in a state in which the panel member and the base are spaced apart, and when the first load is applied to the panel member, a load is transmitted to the entire base including the thick region of the elastic member,
A floor structure, wherein the spring constant of the protrusion is greater than the spring constant of the base. The floor structure according to claim 1 or 2 ,
A floor structure, wherein the protrusion is formed of high-damping rubber. A floor structure comprising:
A panel member;
A support member for supporting the panel member;
an elastic member disposed between the panel member and the support member and elastically deformable in a vertical direction;
The elastic member includes a base portion disposed on the support member and a protrusion portion protruding upward from the base portion,
the base portion has a spring constant that is preset to obtain a predetermined vibration isolation performance in a state where a first load is applied on the panel member,
a thick region including the protrusion of the elastic member and a region of the base that overlaps with the protrusion, when a second load smaller than the first load is applied to the panel member, the panel member and the protrusion come into contact with each other in a state in which the panel member and the base are spaced apart, and when the first load is applied to the panel member, a load is transmitted to the entire base including the thick region of the elastic member,
the elastic member has a damping member having a higher damping performance than the thick region in a region on the base other than the region where the protrusion protrudes,
A floor structure, wherein the damping member has a spring constant smaller than that of the thickened region and the protrusion.

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