JP4444038B2 - Vibration isolation method for structural floor - Google Patents

Description

  The present invention belongs to the technical field of a vibration isolation method for a structure floor, and more specifically, relates to a vibration isolation method improved from the vibration isolation method for a structure floor according to Japanese Patent Application No. 2003-44710 by the present applicant.

  The vibration of a structure caused by the exciting force of a large number of people dancing or jumping to the music or the operation of a press machine propagates through the frame of the structure on the upper and lower floors or the foundation. It is known that vibration disturbances such as inducing unpleasant vibrations by inducing horizontal and vertical vibrations (resonances) in floors and beams of neighboring structures by propagating through the ground.

  This vibration disturbance is caused by the fact that many humans move up and down almost in phase with the rhythm of music. For example, when two excitation forces act in the same phase, the structure is vibrated twice as much as one excitation force. When more exciting force acts in the same phase, the vibration generated in the structure is usually excessive at an integral multiple of 3 times, 4 times, ... depending on the number of people. Even when the phase is not the same, it becomes excessive.

  Conventional anti-vibration technology introduces anti-vibration technology, such as anti-vibration support for the entire floor where the excitation force acts, using anti-vibration materials, thereby avoiding resonance and reducing the structure under the floor (foundation, ground, etc.). Reduction of vibration transmissibility has been attempted (for example, see Patent Documents 1 to 3).

  The anti-vibration technique disclosed in the above-mentioned Patent Document 1 has a mode in which the phases of reciprocating motions of a plurality of press machines, which are excitation forces, are shifted from each other in advance, and cancels vibration waves based on inertial forces in each press machine. The anti-vibration effect is aimed at by making. However, this anti-vibration technique has a problem that it cannot be applied to a structure in which a large number of people move up and down substantially in the same phase in accordance with the rhythm of music because the phase cannot be set in advance.

  The anti-vibration technique disclosed in Patent Document 2 is provided with a hollow panel on the entire floor on which an excitation force acts, an elastic body with a high-density body built in the hollow panel, and moving the elastic body. The anti-vibration effect is achieved by acting as a vibration absorber and effectively absorbing the vibration generated in the hollow panel (floor) to reduce the vibration of the entire panel. However, according to this anti-vibration technology, as described above, since the entire surface of the floor is anti-vibrated, a large amount of anti-vibration materials are required depending on the floor area, which is not economical. In addition, the dynamic vibration absorber has a certain effect for a specific frequency, so that the vibration frequency varies with the speed of the music, such as an operation that matches the music rhythm. There is also a problem that is not effective.

  The anti-vibration technique disclosed in Patent Document 3 is a vibration installed in the same place by installing an active damping device that generates a damping force in the vertical direction in order to cancel the vibration in a place where the vibration trouble of the structure occurs. Based on the vibration information measured by the sensor, drive control of the active vibration damping device is performed to achieve a vibration damping effect. However, according to this anti-vibration technology, there is a problem that the active vibration damping device itself is very expensive and requires a maintenance cost, and the control by the vibration sensor is precise and complicated.

  The present applicant has recently developed a vibration isolating method for a structural floor according to the above-mentioned Japanese Patent Application No. 2003-44710 (hereinafter, abbreviated as a prior application as appropriate) and filed a patent application separately.

  The vibration isolating method for the structure floor according to the prior application is configured by combining the floor of the structure with an anti-vibration area that is anti-vibration-supported against an excitation force and a non-vibration-proof area that is not anti-vibration-supported, The phase of the vibration transmitted from the vibration isolation area to the underfloor structure is delayed, and the vibration is canceled out using the phase difference from the vibration transmitted from the non-vibration isolation area to the underfloor structure (see claim 1 of the prior application). ), As compared with the prior art in which the entire surface of the floor is vibration-proofed and supported without using the phase difference, as shown in FIG. 5 of the prior application, f is the vibration frequency and fn is the natural frequency of the floor. In this case, it can be seen that a remarkable anti-vibration effect (vibration transmission rate when Fs is a transmission force and Fso is an excitation force: Fs / Fso) is obtained in the range of 0 <f / fn <2.

  Therefore, according to the vibration isolating method for the structure floor of the prior application, as described in [Effects of the present invention], (1) Only a part of the floor of the structure on which the excitation force acts is vibration proof. It is possible to support and provide a vibration isolation effect, and since it can be implemented with a simple structure, it is economical. (2) The ratio of the vibration isolation area to the structure floor where the excitation force acts The anti-vibration effect can be achieved regardless of whether the vibration frequency of the vibration force is high or low and the phase of the vibration force is different.

Japanese Patent Publication No.3-3818 Japanese Examined Patent Publication No. 4-58865 JP-A-8-53954

  As can be seen from FIG. 5 of the prior application, the technique disclosed in the prior application can reduce the maximum value (peak) of the vibration transmissibility as compared with the prior art, as well as the overall value of the vibration transmissibility. In addition to being able to easily implement a vibration-proof support structure with a general-purpose vibration-proof material such as an air spring, it is excellent in that the comfortability can be improved (particularly paragraph [0033] of the specification of the prior application). reference).

  However, if the vibration transmissibility can be further reduced as a whole including the maximum value, it can be carried out by setting the natural frequency of the floor to be larger, and without worrying about the amplification region of the vibration transmissibility. Since it is clear that the vibration-proofing effect can be achieved more flexibly and it becomes easier to implement, it can be said that there is still room for improvement.

  Further, the technology disclosed in the prior application has a feature that a minimum value of the vibration transmissibility (Fs / Fso) can be realized in one place in a range of 1.0 <f / fn <2.0. Compared to the conventional technology that cannot actually realize the value, it is superior in that the maximum vibration isolation effect can be obtained by tuning the natural frequency of the vibration isolation area to the minimum value (prior application) See especially paragraph [0049] of the description).

  However, if the minimum value of the vibration transmissibility is not limited to one place and can be realized at a plurality of places, it can effectively deal with the excitation forces having a plurality of different frequencies and exhibit a vibration-proofing effect efficiently. It can be said that there is still room for improvement.

  The object of the present invention is to reduce vibration transmissibility as a whole as compared with the vibration isolation method for a structural floor disclosed in the previous Japanese Patent Application No. 2003-44710, and to apply an excitation force having a plurality of different frequencies. In contrast, the object is to provide a vibration isolation method for a structural floor that can be individually addressed and efficiently exhibit a vibration isolation effect. In addition, a structure that can improve robustness against fluctuations in frequency, damping constant, excitation force sharing ratio, etc. (a property that is excellent in stability or a property that can be flexibly handled; the same shall apply hereinafter). It is to provide a floor vibration isolation method.

  As a means for solving the above-described problems of the prior art, the vibration isolating method for a structure floor according to the invention described in claim 1 includes a plurality of anti-vibration methods in which the floor of the structure is supported by vibration isolation against vibration force. It consists of a combination of a vibration area and a non-vibration-proof area that does not support vibration-proofing, the plurality of vibration-proof areas have different natural frequencies, and the phase of vibration transmitted from the vibration-proof area to the underfloor structure Each is delayed, and the vibrations are canceled out using the phase difference from the vibration transmitted from the non-vibration-proof area to the underfloor structure.

  The vibration isolation method for a structure floor according to the invention described in claim 2 includes a plurality of vibration isolation areas in which the floor of the structure is vibration-supported against an excitation force, and a non-vibration-proof area that does not support vibration isolation. The plurality of anti-vibration areas are configured such that a set of anti-vibration areas having the same natural frequency has a different natural frequency for each set and is transmitted from the anti-vibration area to the underfloor structure. The phase of the vibration is delayed, and the vibration is canceled out using a phase difference from the vibration transmitted from the non-vibration-proof area to the underfloor structure.

  According to the third aspect of the present invention, in the vibration isolation method for a structural floor according to the first or second aspect, the natural vibration of the vibration isolation area is obtained with respect to the vibration transmissibility obtained by dividing the transmission force to the underfloor structure by the excitation force. By tuning the number and damping constant and number, the excitation force sharing ratio between the anti-vibration area and the non-vibration-proof area, and the excitation force sharing ratio of each anti-vibration area in any combination, the maximum vibration transmissibility can be obtained. The value, the minimum value, and the shape of the transmissibility curve are freely designed.

  According to a fourth aspect of the present invention, in the vibration isolating method for a structure floor according to any one of the first to third aspects, a plurality of vibration isolation areas are provided in a grid pattern.

  The invention described in claim 5 is the structure floor vibration isolation method according to any one of claims 1 to 4, wherein the vibration isolation area and the non-vibration isolation area are viewed in the plane direction and alternately in the vertical and horizontal directions. The floor of the structure is configured in a grid pattern as a whole.

  The invention described in claim 6 is the structure floor vibration-proof method according to any one of claims 1 to 5, wherein the vibration-proof area and the non-vibration-proof area are set to substantially the same height. Features.

According to the vibration isolating method for a structural floor according to the present invention, in addition to the effects exhibited by the structural floor vibration isolating method disclosed in the prior application, the following effects are exhibited.
1) Since the vibration transmissibility can be further reduced as a whole, the natural frequency of the floor 1 can be set larger, and the vibration isolating effect can be made more flexible without worrying about the amplification region of the vibration transmissibility. In addition, it is possible to realize a vibration isolation method that is further excellent in vibration isolation, such as improving habitability.
2) It is possible to individually deal with the excitation forces having a plurality of different frequencies and efficiently exhibit the vibration isolation effect.
3) It is possible to improve robustness against fluctuations such as the frequency, damping constant, and excitation force sharing ratio.
4) By tuning the number of divisions, damping constant, excitation force sharing ratio, etc. of each anti-vibration area 2a ..., it is possible to adjust the maximum and minimum values and the sharpness of the vibration transmissibility. The vibration transmissibility corresponding to various needs can be designed.

1 and 2 show an embodiment of a vibration isolation method for a structure floor according to claim 1.
This vibration isolating method for a structural floor is composed of a combination of a plurality of vibration isolating areas 2 that are supported by anti-vibration force against a vibration force and a non-vibration isolating area 3 that is not supported. The plurality of vibration isolation areas 2 have different natural frequencies fn, and the phase of vibration transmitted from the vibration isolation area to the underfloor structure (foundation or floor of the building, the same applies hereinafter) 4. And the vibrations are canceled out using the phase difference from the vibration transmitted from the non-vibration-proof area 3 to the underfloor structure 4 (the invention according to claim 1).

  The non-vibration-proof area 3 in the illustrated example is implemented as the non-vibration-proof area 3 with the underfloor structure 4 as it is in order to have the simplest structure that does not cause a phase delay. This technical idea also follows an embodiment described in FIGS. 23 and 24 described later. However, the non-vibration-proof area 3 is not limited to the technical idea of implementing the underfloor structure 4 as it is. For example, as shown in FIG. 25, the non-vibration-proof area 3 is made of concrete that does not cause a phase delay on the upper surface of the underfloor structure 4. Of course, the non-vibration-proof area 3 can be implemented with the members 7 and 8 interposed therebetween.

  Since the non-vibration-proof area 3 is not required to have a phase lag with respect to the vibration-proof area 2, it can be supported using an elastic material that is harder than the support material of the vibration-proof area 2. For example, when there is a living room under the underfloor structure 4, a floating floor structure by elastic support is indispensable as a countermeasure against a floor impact sound. In such a case, the non-vibration-proof area 3 is supported by an elastic material that is sufficiently harder than the vibration-proof area 2 and that has a sound insulation effect.

  Specifically, FIG. 1 divides an anti-vibration area 2 for anti-vibration support against an excitation force into two anti-vibration areas 2a and 2b having different natural frequencies, and the anti-vibration areas 2a and 2b, and The ratio of the three areas of the non-vibration-proof area 3 that does not support vibration-proof (ratio of the vibration-proof areas 2a and 2b to the non-vibration-proof area 3 and the non-vibration-proof area 3. The same applies hereinafter) is set to 1: 1: 2 is doing. The area ratio is 1: 1: 2 for convenience, but is not limited to this. For example, as shown in FIG. 26A, the area ratio can be implemented arbitrarily.

  FIG. 2 divides an anti-vibration area 2 for anti-vibration support against an excitation force into four anti-vibration areas 2a, 2b, 2c, and 2d having different natural frequencies, and the anti-vibration areas 2a, 2b, The ratio of the five areas 2c, 2d and the non-vibration-proof area 3 that does not support vibration-proof (ratio of the vibration-proof areas 2a, 2b, 2c, and 2d to the non-vibration-proof area 3; It is set to 1: 1: 1: 4. The area ratio is 1: 1: 1: 1: 4 for the sake of convenience, but is not limited to this. For example, as shown in FIG.

  Incidentally, as a reference diagram for comparison with the image stabilization technique of the present invention, FIG. 3 shows an embodiment according to the prior application 2003-44710. In this embodiment, the area ratio between the vibration-proof area 2 and the non-vibration-proof area 3 is set to 1: 1. FIG. 4 shows an embodiment according to the prior art in which the entire floor is supported by vibration isolation (the vibration isolation area 2).

  That is, in FIGS. 1 to 3, the total area of the image stabilization area 2 and the total area of the non-vibration isolation area 3 are 1: 1 for convenience. 3 and 4 cannot support the vibration isolation area 2 at different natural frequencies because of its structure. Incidentally, reference numeral 5 in the figure denotes a vibration isolating material.

  FIG. 5A is a graph showing the frequency characteristic with respect to the vibration transmissibility of the prior application anti-vibration technique according to FIG. 3. As an example, in order to increase the vibration transmissibility by 0.2 at a frequency of 2.5 Hz, the anti-vibration area is supported at 2.5 Hz ÷ √2≈1.77 Hz. The vibration transmissibility at 1.77 Hz is amplified about 3.5 times.

  In the operation to match human music etc., which is one of the scope of application of this technology, the vibration frequency changes depending on the music pitch, and 2 to 3 Hz is said to be the frequency that most easily moves according to the music. . However, depending on the case, even a song with a frequency of about 1.77 Hz may exhibit a certain large excitation force, and it can be said that the higher the amplification factor, the higher the possibility of a vibration complaint.

  In that regard, the anti-vibration technology according to the present invention according to FIGS. 1 and 2 causes the cancellation phenomenon using the phase difference of the prior application, as described below, without impairing the performance of reducing vibration, The amplification factor of the amplification region can be reduced.

  In order to solve the problem of reducing the amplification factor of the amplification region while maintaining the vibration reduction performance, the vibration isolation technology according to the present invention includes a plurality of vibration isolation areas 2 according to the prior application shown in FIG. 2 or 4), and optimally set each frequency, damping constant, and ratio of the excitation force to be shared (excitation force sharing ratio) according to the frequency characteristics to be reduced. This is a technology characterized by The frequency and damping constant can be set by individually changing the mass, rigidity, and damping of the vibration-proof area 2.

  In order to contrast with the anti-vibration technique according to the prior application shown in FIG. 3, the anti-vibration area 2 is divided into two (see FIG. 1) and four (see FIG. 2) with respect to the vibration frequency f = 2.5 Hz. 5B and 5C respectively show the results of optimum setting so that the vibration transmissibility is reduced by a factor of 0.2 and the gain is reduced.

  When the anti-vibration technology according to the prior application is compared with the anti-vibration technology according to the present invention, in the case of the prior application in which the anti-vibration area 2 is not divided, the maximum value of the vibration transmissibility (amplification factor) which was 3.5 times Can be reduced to about 2.1 times when divided into two and about 1.4 times when divided into four (see FIGS. 5A to 5C).

  Thus, by dividing the vibration-proof area 2 into a plurality, it is possible to reduce the amplification factor while maintaining the reduction rate with respect to the frequency. Incidentally, FIGS. 5A to 5C show, as an example, examination results in which the excitation force sharing ratio of the entire vibration-proof area 2 and the non-vibration-proof area 3 is 1: 1. Of course, further reduction of the amplification factor is expected by optimally setting the excitation force sharing ratio of the entire vibration isolation area 2 and the non-vibration isolation area 3 and the vibration distribution ratio of each divided vibration isolation area 2a. be able to.

  In this example, two examples of two divisions and four divisions were given. However, as is clear from the comparison between FIG. 5B and FIG. 5C, the four divisions have a lower amplification factor than the two divisions. I understand. In this way, the amplification factor can be further reduced by increasing the number of divisions. In the present embodiment, the number of divisions is divided into two and four. However, the present invention is not limited to this, and it is of course possible to increase the number of divisions as necessary (FIG. 23 to FIG. 23). FIG. 25).

  As shown in FIG. 1 and FIG. 2, as a further effect obtained by dividing the vibration isolation area 2 and supporting the divided vibration isolation areas 2a at different natural frequencies, One example is to improve robustness against parameter fluctuation.

  That is, the frequency of the vibration isolation area 2 may vary depending on the mass and rigidity. For example, when the image stabilization technique is applied to an operation in accordance with human music or the like, the mass varies depending on the number of people placed on the image stabilization area 2 or the weight of each individual, which causes the frequency variation. In addition, in the elastic material that supports the vibration-proof area 2, the rigidity may fluctuate due to temperature and aging, which also causes the frequency fluctuation. Furthermore, the damping material using oil, gel material, magnetism, etc. among the elements constituting the vibration isolation area 2 is most susceptible to the use environment, and the damping constant is in a state of easily changing. In view of such a situation, as described below, the image stabilization technique according to the present invention is less affected by fluctuations in the frequency and damping constant, and can exhibit a stable effect.

  The numerical values used in describing FIGS. 5A to 5C, that is, the case where the vibration transmissibility at a frequency of 2.5 Hz is reduced to 0.2 times as an example, the frequency and damping constant according to the vibration isolation technique of the present invention are taken as an example. The effect of improving the robustness against the fluctuation of the above will be described.

  First, specific examples of fluctuations in the frequency are shown in FIGS.

  FIG. 6 is a graph showing the frequency characteristics with respect to the vibration transmissibility for the vibration isolating technique of the prior application, as in FIG. 5A. A symbol X in FIG. 6 indicates a frequency characteristic when the vibration-proof area 2 shown in FIG. 3 is not divided, and represents the same line as the line shown in FIG. 5A. 6 indicates the frequency characteristics when the natural frequency of the vibration-proof area 2 shown in FIG. 3 is 1.3 times. From FIG. 6, the X line has a vibration transmissibility of a frequency of 2.5 Hz, while the Y line has a natural frequency of 1.3 times, the vibration of a frequency of 2.5 Hz. The transmission rate increases 0.3 times. Further, FIG. 8 is a plot in which the natural frequency of the vibration isolation area 2 is implemented in the range of 0.7 to 1.3 times, and the number of vibration transmissibility at a frequency of 2.5 Hz is examined and multiplied. This is indicated by the symbol S in the middle.

  FIG. 7 is a graph showing the frequency characteristics with respect to the vibration transmissibility for the vibration isolation technique of the present invention shown in FIG. 1 as in FIG. 5B. A symbol X in FIG. 7 indicates a frequency characteristic when the vibration-proof area 2 shown in FIG. 1 is divided into two, and represents the same line as the line shown in FIG. 5B. The symbol Y in FIG. 7 indicates the frequency characteristics when the natural frequencies of the vibration-proof areas 2a and 2b shown in FIG. From FIG. 7, the X line has a vibration transmissibility of a frequency of 2.5 Hz, while the Y line has a natural frequency of 1.3 times, and the Y line has a frequency of 2.5 Hz. The vibration transmissibility increases 0.3 times. In addition, as in the case where the vibration isolation area 2 is not divided, the natural frequency of the vibration isolation area 2 is implemented in the range of 0.7 to 1.3 times, and the vibration transmissibility of the vibration frequency of 2.5 Hz is increased by several times. A plot obtained by examining whether or not is shown by a symbol T in FIG.

  As shown in FIG. 6 to FIG. 8, when the vibration-proof area 2 is not divided and when the vibration-proof area 2 is divided into two, different natural frequencies of the two divided vibration-proof areas 2 a and 2 b are fluctuated to the same magnification. Comparing these cases, it can be seen that the robustness against the frequency fluctuation is not improved.

  Next, the case where the vibration isolation area 2 is divided into two and only one of the different natural frequencies of the two divided vibration isolation areas 2a and 2b is changed will be examined in the same manner.

  FIG. 9 shows vibrations when the natural frequency is 1.3 times for only the natural frequency of the anti-vibration areas 2a and 2b having a higher natural frequency (for example, the anti-vibration area 2a). Numerical characteristics are shown (see symbol Y in FIG. 9). In addition, only the natural frequency of the anti-vibration area 2a is carried out in the range of 0.7 to 1.3 times, and what is plotted after examining how many times the vibration transmissibility at the frequency of 2.5 Hz is increased. This is indicated by symbol S in FIG. Incidentally, X in FIG. 9 shows the frequency characteristics when the vibration-proof area 2 shown in FIG. 1 is divided into two, similarly to the reference X in FIG. 7, and the reference T in FIG. As in the case of symbol T in Fig. 8, the natural frequency of the anti-vibration area 2 is set in the range of 0.7 to 1.3 times, and the number of vibration transmissibility at the frequency of 2.5Hz is examined. And plotted.

  9 and FIG. 11, when the natural frequency of the vibration isolation area 2a having a high natural frequency is 1.3 times, the vibration transmissibility of the frequency 2.5 Hz is 0.2 times to 0.3. The result is almost the same as the above-described examination result, and it can be seen that the robustness against the frequency fluctuation is not improved.

  On the other hand, FIG. 10 shows the case where the natural frequency is increased 1.3 times only for the one having a lower natural frequency (for example, the vibration-proof area 2b) among the different natural frequencies of the vibration-proof areas 2a and 2b. (Refer to the symbol Y in FIG. 10). In addition, only the natural frequency of the anti-vibration area 2b is performed in the range of 0.7 to 1.3 times, and a plot obtained by examining how many times the vibration transmissibility at a frequency of 2.5 Hz is increased. This is indicated by the symbol U in FIG. Incidentally, the symbol X in FIG. 10 indicates the frequency characteristic when the vibration-proof area 2 shown in FIG. 1 is divided into two, like the symbol X in FIG.

  From FIG. 10, when only the natural frequency of the vibration-proof area 2b in which the natural frequency is set low is 1.3 times, the vibration transmissibility of the frequency 2.5 Hz hardly fluctuates from 0.2 times. . In addition, as can be seen from the U line in FIG. 11, the robustness is improved when the vibration isolation area 2 is divided and only the natural frequency of the vibration isolation area 2 b in which the natural frequency is set low is changed. I understand.

  Therefore, in the case of carrying out the prior art anti-vibration technology that does not divide the anti-vibration area 2, in order to obtain the set effect, the frequency deviation is not allowed over the entire anti-vibration area 2. The effect of improving the robustness by dividing the area 2 makes it possible to reduce the anti-vibration area 2 in which the deviation of the frequency is not allowed, and the permissible range is wide and permanent implementation is possible. Further, when the number of divisions is increased, the proportion of the vibration-proof area 2 where the frequency deviation is not allowed can be reduced. This is because in the divided anti-vibration areas 2a..., The frequency deviation of the anti-vibration area having the highest frequency has a dominant influence on the variation in the transmission rate.

  Next, among the elements constituting the anti-vibration area 2, the attenuation that is most easily affected by the use environment and easily fluctuates is the same as when the frequency fluctuates, as in the case where the frequency fluctuates. A case where the value is reduced by a factor of 0.2 will be described as an example.

  FIG. 12 and FIG. 13 are graphs showing the frequency characteristics with respect to the vibration transmissibility with respect to the fluctuation of the attenuation. A symbol X in FIG. 12 represents a frequency characteristic when the vibration-proof area 2 according to the previous application is not divided, and indicates the same line as in FIG. 5A. A symbol Y in FIG. 12 indicates a frequency characteristic when the damping of the image stabilization area 2 is 0.5 times. From FIG. 12, the transmission rate at the frequency of 2.5 Hz is 0.2 times in the X line, whereas it is reduced to about 0.1 times in the Y line in which the attenuation is 0.5 times. I understand that. Moreover, it turns out that the maximum value of the transmission rate is amplified from 3.5 times to 6.8 times.

  On the other hand, FIG. 13 shows the result of the same examination in the case where the attenuation of both the vibration isolation areas 2a and 2b when the vibration isolation area 2 according to the present invention is divided into two is 0.5 times. is there. A symbol X in FIG. 13 represents a frequency characteristic when the vibration-proof area 2 is divided into two, and shows the same line as in FIG. 5B. The symbol Y in FIG. 13 indicates the frequency characteristics when the damping of the vibration-proof areas 2a and 2b is 0.5 times each. From FIG. 13, the transmission rate at the frequency of 2.5 Hz is 0.2 times in the X line, whereas it is reduced to about 0.1 times in the Y line where the attenuation is 0.5 times. The results are almost the same when the vibration-proof area 2 is not divided. In addition, the maximum value of the transmission rate is amplified from 2.0 times to 4.0 times, which is lower than the case where the anti-vibration area 2 is not divided. It can be said that the level is kept lower than the case.

  14 and FIG. 15, FIG. 14 shows a case where the attenuation of the image stabilization area 2 when the image stabilization area 2 according to the prior application is not divided is varied by 0.5 to 1.5 times (reference X in the figure). ), And the case where the vibration-proof area according to the present invention is divided into two parts and both the vibration-proof areas 2a and 2b are both attenuated by 0.5 to 1.5 times (reference numeral Y in the figure). Three cases of the case where the anti-vibration area according to the invention is divided into four and the attenuation of each of the anti-vibration areas 2a, 2b, 2c and 2d is varied by 0.5 to 1.5 times (reference numeral Z in the figure) FIG. 15 is a plot of fluctuations in the vibration transmissibility at a frequency of 2.5 Hz at which the transmissibility becomes the minimum value, and FIG. 15 shows the frequency at 2.5 Hz at which the transmissibility becomes the maximum for the three cases. This is a plot of fluctuations in vibration transmissibility.

  14 and 15, it can be seen that dividing the anti-vibration area 2 does not improve the robustness against the fluctuation of the minimum value so much, but the number of divisions is increased for the fluctuation of the maximum value. It can be seen that the curve is gentler and the robustness is improved.

  Next, of the anti-vibration areas 2a and 2b obtained by dividing the anti-vibration area 2 according to the present invention into two, the natural frequency is set higher (for example, the anti-vibration area 2a) and lower (for example, the anti-vibration area 2b). 16 and 17 show the results of varying the attenuation by 0.5 times for only one of the above.

  As shown in FIG. 16, when the damping of the anti-vibration area 2a with the higher natural frequency is increased by 0.5 times, the minimum value of the vibration transmissibility at the frequency of 2.5 Hz is 0.2 to 0. It is reduced to 12 times, and it can be seen that the robustness is slightly improved as compared to the minimum value of 0.1 times when the image stabilization area 2 is not divided (see FIG. 12). The maximum value of the vibration transmissibility is amplified from 2.0 times to 4.0 times as in the case where the attenuation of both the vibration isolation areas 2a and 2b is 0.5 times (see FIG. 13). It can be said that a lower level is maintained than when the vibration-proof area 2 is not divided.

  As shown in FIG. 17, when the damping of the anti-vibration area 2b in which the natural frequency is set low is 0.5 times, the minimum value of the vibration transmissibility at a frequency of 2.5 Hz is almost changed from 0.2 times. It can be seen that the robustness is improved. It can also be seen that the maximum value of the vibration transmissibility is only amplified from 2.0 times to 3.0 times, and the robustness is improved.

  18 and FIG. 19, FIG. 18 shows a case where the attenuation of the image stabilization area 2 when the image stabilization area 2 according to the prior application is not divided is changed by 0.5 to 1.5 times (reference numerals in the drawing). X), when the damping of the anti-vibration area 2a in which the anti-vibration area 2 according to the present invention is divided into two and the vibration frequency is set high is changed by 0.5 to 1.5 times (symbol Y in the figure) In a total of three cases where the attenuation of the anti-vibration area 2b set to be low is changed by 0.5 to 1.5 times (Z in the figure), the transmission frequency is 2.5 Hz at which the transmissivity becomes the minimum value. FIG. 19 is a plot of fluctuations in vibration transmissibility at a frequency of 2.5 Hz at which the transmissivity is maximum for the three cases. That is, the X-line vibration characteristic diagrams of FIGS. 18 and 19 coincide with the X-line vibration characteristic diagrams of FIGS.

  As shown in FIG. 18, when the damping of the anti-vibration area 2a having a high natural frequency among the anti-vibration areas 2a and 2b divided into two is changed with respect to the minimum value of the vibration transmissibility, the anti-vibration area 2 is not divided. It can be seen that the robustness is slightly improved. In addition, it can be seen that the robustness is significantly improved when the damping of the vibration-proof area 2b in which the natural frequency is set low varies as compared with the case where the vibration-proof area 2 is not divided.

  As described above, in view of the fact that attenuation is most easily affected by the use environment and easily fluctuates, if the anti-vibration area 2 according to the prior application is not divided, the attenuation is prevented in order to obtain the set effect. Although the variation in attenuation is not allowed over the entire vibration area 2, the effect of dividing the vibration isolation area 2 improves the robustness with respect to the variation in attenuation, and the vibration isolation area in which the variation in attenuation is not allowed. Can be reduced, and the tolerance is wide and permanent.

  As described above, with regard to fluctuations in the frequency and attenuation, the case where the vibration isolation area 2 is not divided, the case where it is divided into two, and the case where it is further divided into four have been described. The present invention is not limited to four, and as shown in FIGS. 23 to 25, the number of divisions can be increased as necessary. Further, the area ratio between the total area of the image stabilization area 2 and the non-vibration isolation area 3 is not limited to 1: 1, and can be implemented with an arbitrary area ratio as shown in FIGS.

  Therefore, from the above examination results, it can be reliably predicted that the robustness will gradually improve as the number of divisions of the vibration isolation area 2 is increased. In this embodiment, the anti-vibration areas 2a divided into four are implemented at four different natural frequencies, but the present invention is not limited to this, and there is a set of anti-vibration areas having the same natural frequency. Further, the present invention can be carried out with combinations having different natural frequencies for each set, that is, at least two different natural frequencies (the invention according to claim 2). In short, the anti-vibration method according to the present invention can exhibit an anti-vibration effect superior to that of the prior art if the anti-vibration areas 2a are anti-vibrated and supported at different natural frequencies.

  Next, the effect of reducing vibrations for a plurality of different vibration frequencies by performing vibration isolation support in a plurality of vibration isolation areas 2a... Having different natural frequencies will be described.

  When the anti-vibration area 2 is divided into one anti-vibration area 2, as shown in FIG. 5A, the vibration transmissibility has a characteristic of taking one minimum value. In the case of reducing the vibration for a number, there was a great merit. However, in the case of targeting a plurality of vibration frequencies, there was a problem that the vibration could be reduced only for one certain frequency. However, the vibration isolation technique according to the present invention can exhibit a vibration reduction effect for a plurality of excitation frequencies by dividing the vibration isolation area 2 into a plurality as described below.

  As an example, this effect will be described assuming that a human performs a jumping motion at a frequency f of 1.25 Hz. First, FIG. 20 shows the excitation force that can be generated when one person performs a jumping motion at 1.25 Hz.

  Since the excitation force due to the jumping motion of a human is not a perfect sine wave, it is characterized in that the excitation force is generated in integral multiples of two times, three times, etc. in addition to the vibration frequency. As indicated by the black circles in FIG. 20, there is an excitation force of 11.0 kgf at 1.25 Hz and 44.0 kgf at 2.5 Hz.

  When an attempt is made to reduce the 2.5 Hz component with the maximum excitation force by 0.2 times without dividing the anti-vibration area 2 according to the previous application with respect to the excitation force having such characteristics, FIG. 21 (same as FIG. 5A), the 2.5 Hz component is reduced by a factor of 0.2, resulting in 44.0 kgf × 0.2 times = 8.8 kgf, but 1.25 Hz. Since the component is amplified 1.6 times, 11.0 kgf × 1.6 times = 17.6 kgf, and as a result, a larger phenomenon occurs with the 1.25 Hz component.

  On the other hand, when the anti-vibration area according to the present invention is divided into two, the transmission characteristic is as shown in FIG. 22 (same as FIG. 17). The component is reduced by 0.2 times to 44.0 kgf × 0.2 times = 8.8 kgf, and the 1.25 Hz component can also be reduced by 0.8 times, so that 11.0 kgf × 0.8 times = 8. It becomes 8 kgf, and it becomes possible to reduce two peaks simultaneously.

  Further, as shown in FIGS. 16 and 17, the sharpness of the generated amplification peak and the reduction peak can be increased or decreased by changing the attenuation of only one of the anti-vibration areas 2a and 2b divided into two. In addition, it is possible to adjust the vibration frequency and the harmonic frequency so as to obtain an optimum value, and the vibration force can be freely reduced. For example, if you do not want to generate a vibration with a frequency of 1.25 Hz, but may generate a slight amount of vibration with a frequency of 2.5 Hz, the natural frequency is set low as shown by the Y line in FIG. A setting for reducing the attenuation of the vibration-proof area 2b can be applied.

  This feature is not limited to human movements (jumping motion), but it can be applied to excitation forces with harmonic components (such as transformers 50 Hz and 100 Hz) and to different frequencies even if not harmonics. The present invention can be applied to an excitation force having an excitation force peak. Further, in the present embodiment, as an example, the case where the vibration isolation area 2 is divided into two parts has been described, but the present invention is not limited to the two parts. As the number of divisions increases, the number of gradual, increase / decrease and reduction peaks can be increased. Therefore, if necessary, it is carried out in a number of three or more divisions of anti-vibration areas 2a, 2b, 2c. You can also.

  Thus, according to the vibration isolating method for a structural floor according to the present invention as set forth in claim 1 and claim 2, the overall vibration transmissibility is compared with the effect by the vibration isolating method for the structural floor according to the prior application. Therefore, it is possible to realize a vibration isolating method that is further excellent in the vibration isolating effect, such as improving the comfortability. Moreover, since it can respond separately with respect to the excitation force which has several different frequency, it can exhibit a vibration-proof effect efficiently.

  In general, the vibration transmissibility obtained by dividing the transmission force to the underfloor structure by the excitation force is the natural frequency and damping constant and number of the vibration isolation area 2 and the vibration between the vibration isolation area 2 and the non-vibration isolation area 3. By tuning the force sharing ratio and the excitation force sharing ratio of each anti-vibration area in an arbitrary combination, the maximum value and minimum value of the vibration transmissibility, the shape of the transmissibility curve (number and value of peaks and troughs, It is possible to design (inclination, etc.) corresponding to various needs (the invention according to claim 3), and the robustness can be improved.

  FIG. 23 to FIG. 26 show variations of the embodiment according to the vibration isolation method for a structure floor of the present invention.

  In FIG. 23, the total area of the vibration-proof area 2 and the total area of the non-vibration-proof area 3 are 1: 1. Further, the anti-vibration area 2 is implemented by providing nine anti-vibration areas 2a... Obtained by dividing the anti-vibration area 2 into nine equal parts in a grid pattern (the invention according to claim 4). The gap is used for the passage 9.

  In FIG. 24, the total area of the vibration-proof area 2 and the total area of the non-vibration-proof area 3 are 1: 1. The anti-vibration area 2 is implemented by dividing the anti-vibration area 2 into 12 equal parts and providing twelve anti-vibration areas 2a ... each having a different natural frequency in a grid pattern. Invention), the lattice-shaped gap is used for the passage 9. Furthermore, by concretely placing concrete 6 on the underfloor structure 4 and making it coincide with the height of the vibration-proof area 2 (invention of claim 6), it can be suitably used for an aerobics studio or the like. . Since the non-vibration-proof area 3 is not required to have a phase lag with respect to the vibration-proof area 2, it can be supported using an elastic material that is harder than the support material of the vibration-proof area 2. For example, when there is a living room under the underfloor structure 4, a floating floor structure by elastic support is indispensable as a countermeasure against a floor impact sound. In such a case, the non-vibration-proof area 3 is supported by an elastic material that is sufficiently harder than the vibration-proof area 2 and that has a sound insulation effect.

  In FIG. 25, the total area of the vibration-proof area 2 and the total area of the non-vibration-proof area 3 are 1: 1. The anti-vibration area 2 is formed by dividing the anti-vibration area 2 into 16 equal parts and providing 16 anti-vibration areas 2a... With different natural frequencies in a grid pattern. Invention), the lattice-shaped gap is used for the passage 9. Furthermore, by placing concrete pillars 7 on the underfloor structure 4 and constructing a concrete floor 8 thereon to match the height of the vibration isolation area 2 (invention of claim 6), It can be suitably used in an aerobics studio or the like.

  In FIGS. 23 to 25, the total area of the vibration-proof area 2 and the total area of the non-vibration-proof area 3 are 1: 1, but the present invention is not limited to this and can be implemented at an arbitrary ratio. For example, as shown in FIG. 26A, the total area of the vibration-proof area 2 and the total area of the non-vibration-proof area 3 can be 3: 2, or as shown in FIG. The total area and the total area of the non-vibration-proof area 3 can be 4: 1.

  As described above, the vibration isolating method according to the present invention implements a plurality of vibration isolating areas 2a... By implementing an arbitrary area and an arbitrary natural frequency according to a required vibration design. The effect can be demonstrated.

  In addition, as shown in FIG. 26C, not only the anti-vibration area 2 but also the non-vibration-proof area 3 is divided, and the plurality of anti-vibration areas 2 and the plurality of non-vibration-proof areas 3 are viewed in the plane direction. It can also be carried out by arranging the floor 1 of the structure in a grid pattern as a whole by arranging them alternately in the direction (the invention according to claim 5). In an aerobics studio or the like, there may be a bias in the arrangement of dancers, so as in the embodiment shown in FIG. 26C, the vibration isolation area 2a... Deviation from the force sharing ratio can be reduced. In addition, the underfloor structure actually has a wide area, and the excitation force sharing ratio may be slightly shifted depending on the distance from the vibration-proof area and the non-vibration-proof area, as shown in FIG. 26C. By disperse finely, the shift due to distance can be alleviated.

  The embodiments have been described with reference to the drawings. However, the present invention is not limited to the illustrated embodiments, and design modifications and application variations that are usually made by those skilled in the art are within the scope of the technical idea. Note that it includes the range.

It is the perspective view which showed the vibration isolating method of the structure floor concerning the invention described in Claim 1. It is the perspective view which showed the vibration isolating method of the structure floor concerning the invention described in Claim 1. It is the perspective view which showed the anti-vibration construction method of the structure floor based on prior application 2003-44710 by this applicant. It is the perspective view which showed the vibration isolating method of the structure floor concerning a prior art. A is a graph showing the frequency characteristics with respect to the vibration transmissibility according to the embodiment shown in FIG. 3, and B is a graph showing the frequency characteristics with respect to the vibration transmissibility according to the embodiment shown in FIG. Yes, C is a graph showing the frequency characteristics with respect to the vibration transmissibility according to the embodiment shown in FIG. It is a graph showing the frequency characteristic with respect to the vibration transmissibility which changed the frequency concerning the Example shown in FIG. 3 1.3 times. It is a graph showing the frequency characteristic with respect to the vibration transmissibility which fluctuated the frequency concerning the Example shown in FIG. 1 1.3 times. 6 and FIG. 7, the natural frequency of the vibration-proof area was implemented in the range of 0.7 to 1.3 times, and the number of vibration transmissibility at the frequency of 2.5 Hz was examined and plotted. It is a graph. 1 is a graph showing the frequency characteristics with respect to the vibration transmissibility in which the frequency of only the vibration-proof area where the natural frequency is set high is changed 1.3 times for the embodiment shown in FIG. 1 is a graph showing frequency characteristics with respect to a vibration transmissibility in which the frequency of only the vibration-proof area where the natural frequency is set low is changed 1.3 times for the embodiment shown in FIG. 9 and 10 were plotted with the natural frequency of the vibration-proof area in the range of 0.7 to 1.3 times, and the number of vibration transmissibility at a frequency of 2.5 Hz was examined and plotted. It is a graph. It is a graph showing the frequency characteristic with respect to the vibration transmissivity which changed attenuation | damping by 0.5 time according to the Example shown in FIG. It is a graph showing the frequency characteristic with respect to the vibration transmissibility which changed attenuation | damping by 0.5 time which concerns on the Example shown in FIG. The attenuation according to the embodiment shown in FIGS. 1 to 3 was performed in the range of 0.5 to 1.5 times, and the fluctuation of the vibration transmissibility at a frequency of 2.5 Hz where the vibration transmissibility becomes the minimum value was plotted. It is a graph. It is the graph which implemented the damping | damping which concerns on the Example shown in FIGS. 1-3 in the range of 0.5 to 1.5 times, and plotted the fluctuation | variation of the vibration transmissibility in which a vibration transmissivity becomes the maximum value. 1 is a graph showing the frequency characteristics with respect to the vibration transmissibility in which the attenuation of only the vibration-proof area where the natural frequency is set high is changed by 0.5 times for the embodiment shown in FIG. 1 is a graph showing the frequency characteristics with respect to the vibration transmissibility in which the attenuation of only the vibration-proof area where the natural frequency is set low is changed by 0.5 times for the embodiment shown in FIG. 16 and FIG. 17 are graphs in which fluctuation is performed in a range of 0.5 to 1.5 times and fluctuations in the vibration transmissibility at a frequency of 2.5 Hz at which the vibration transmissivity becomes the minimum value are plotted. 16 and FIG. 17 are graphs in which fluctuation is performed in a range of 0.5 to 1.5 times and fluctuations in vibration transmissibility at which the vibration transmissivity becomes a maximum value are plotted. It is a graph showing the excitation force which generate | occur | produces when one person jumps at 1.25 Hz. It is a graph showing the frequency characteristic with respect to the vibration transmissibility which concerns on the Example shown in FIG. It is a graph showing the frequency characteristic with respect to the vibration transmissibility which concerns on the Example shown in FIG. It is the perspective view which showed the variation of the vibration proofing method of the structure floor concerning the invention described in Claim 1. It is the perspective view which showed the variation of the vibration proofing method of the structure floor concerning the invention described in Claim 1. It is the perspective view which showed the variation of the vibration proofing method of the structure floor concerning the invention described in Claim 1. A to C are perspective views schematically showing variations of the vibration isolating method for the structure floor according to the first aspect of the present invention.

Explanation of symbols

1 Floor 2 (2a ...) Anti-vibration area 3 Non-vibration-proof area 4 Underfloor structure (foundation, building floor)
5 Anti-vibration material
6 Concrete 7 Concrete pillar 8 Concrete floor 9 Passage

Claims (6)

  The floor of the structure is composed of a combination of a plurality of anti-vibration areas that are anti-vibration-supported against an excitation force and a non-vibration-proof area that is not anti-vibration-supported, and each of the plurality of anti-vibration areas has a natural frequency. The phase of vibration transmitted from the anti-vibration area to the under-floor structure is delayed, and the vibration is canceled out using the phase difference from the vibration transmitted from the non-vibration-proof area to the under-floor structure. Vibration isolation method for structural floors.   The floor of the structure is composed of a combination of a plurality of anti-vibration areas that are anti-vibration-supported against an excitation force and a non-vibration-proof area that is not anti-vibration-supported, and the plurality of anti-vibration areas have a natural frequency. The same anti-vibration area group is a combination with different natural frequencies for each group, the phase of vibration transmitted from the anti-vibration area to the under-floor structure is delayed, and the non-vibration-proof area is transmitted to the under-floor structure. A vibration isolation method for a structural floor, characterized by canceling out vibrations using a phase difference from the vibrations that occur.   Regarding the vibration transmissibility obtained by dividing the transmission force to the underfloor structure by the excitation force, the natural frequency and damping constant and number of the vibration isolation area, the ratio of the excitation force to the vibration isolation area and the non-vibration isolation area, and each vibration isolation The maximum value, the minimum value, and the shape of the transmissibility curve of the vibration transmissibility can be freely designed by tuning the excitation force sharing ratio of the area in an arbitrary combination. The vibration isolation method for the structure floor described in 1.   The vibration isolation method for a structure floor according to any one of claims 1 to 3, wherein a plurality of vibration isolation areas are provided in a grid pattern.   The vibration-proof area and the non-vibration-proof area are alternately arranged in the vertical and horizontal directions when viewed in the plane direction, and the floor of the structure is configured in a grid pattern as a whole. A vibration isolation method for a structure floor according to any one of the above.   The vibration isolation method for a structure according to any one of claims 1 to 5, wherein the vibration isolation area and the non-vibration isolation area are set to substantially the same height.

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