JP7097183B2 - Anti-vibration foundation - Google Patents

Description

The present invention relates to a vibration-proof foundation in which a vibration source is installed.

Conventionally, when a machine that is a vibration source is installed on a foundation, the following structures have been proposed in order to reduce the vibration caused by this machine (see Patent Documents 1 to 3).
Patent Document 1 shows a vibration-damping pile including a hollow pile body, a weight freely arranged in the pile body, and an elastic body provided between the weight and the pile body. Has been done. By driving this vibration damping pile into the ground to support the structure, the vibration transmitted between the structure and the ground causes a reaction force on the weight to reduce the vibration.

Patent Document 2 describes a pile driven into the ground, a rectangular block-shaped foundation built on the head of this pile, columns erected at the four corners of the foundation, and the positions of the columns can be adjusted in the vertical direction. A basic vibration damping device with a weight attached to is shown. The vibration device installed on the foundation is operated, and when the vibration device and the foundation side resonate, the mounting height of the weight to the support is changed.

Patent Document 3 describes a pile, a mat foundation thickening portion constructed on the pile, and an equipment foundation constructed on the mat foundation thickening portion via a vibration-proof material and on which equipment is placed. The foundation structure with, is shown. Since the load of the equipment is transmitted from the mat foundation thickening portion to the pile, the thickness of the mat foundation can be reduced.

Japanese Patent No. 2690357 Japanese Unexamined Patent Publication No. 2001-295300 JP-A-2002-167779

An object of the present invention is to provide a vibration-proof foundation in which the natural period of the foundation can be easily adjusted so as to deviate from the natural period of the vibration generating machine even after the vibration source is installed on the foundation. ..

As a vibration-proof foundation that reduces the vibration of the vibration-generating machine, the present inventors increase the size of the vibration-proof foundation by supporting the floating foundation on which the vibration-generating machine is installed with a pile on which a spring material is installed. The vertical load borne by the pile and spring material can be increased without any problem, and by adjusting or replacing the spring material that supports the floating foundation, the natural period of the vibration-proof foundation can be deviated from the natural period zone of the vibration generating machine. We came up with the present invention by focusing on the point that it can be easily adjusted.
The anti-vibration foundation of the first invention (for example, the anti-vibration foundation 1 described later) reduces vibration transmitted from a vibration source (for example, a vibration generating machine 3 described later) to the ground (for example, the ground 2 described later). A swaying foundation, a pile buried in the ground (for example, a pile 10 described later), a spring provided on the upper surface of the pile (for example, a spring 20 described later), and concrete provided on the spring. A floating foundation body (for example, a floating foundation body 30 described later) and a connecting member fixed to the floating foundation body, penetrating the spring up and down and inserted into the inside of the pile (for example, a connecting member described later). 40) and.

According to the present invention, since the pile, the spring, and the floating base body are arranged in series, vibration isolation can be performed by appropriately changing the configuration of the spring even after installing the vibration generating machine on the floating base body. The natural period of the foundation can be easily adjusted to deviate from the natural period of the vibration source. Therefore, it is possible to suppress the resonance phenomenon between the vibration source and the vibration-proof foundation and reduce the vibration propagating from the vibration source to the surrounding ground.

In addition, conventionally, when a thick, heavy and massive foundation is provided on the ground and a floating foundation is provided on the foundation via a spring, or when a concrete foundation is provided on the ground and a spring is placed on the concrete foundation. In some cases, a floating foundation was provided through the structure. However, according to the present invention, since a pile is buried in the ground and the floating foundation body is supported by the pile via a spring, the weight of the foundation applied to each pile becomes large, so that it is similar to the conventional double foundation structure. In addition, it is not necessary to increase the size of the foundation or bottom plate concrete to increase the weight, and the construction cost of the anti-vibration foundation can be reduced.

The vibration-proof foundation of the second invention is characterized in that the spring is a disc spring (for example, a disc spring 21 described later).
According to the present invention, the floating foundation body was supported by piles via disc springs. This disc spring can be installed even in a small height space between the floating foundation body and the upper surface of the pile. Further, various spring characteristics can be obtained by changing the dimensional ratio between the height direction and the horizontal direction of the disc springs or by stacking a plurality of disc springs. Therefore, the natural period of the anti-vibration foundation of the floating foundation type can be easily adjusted.

The vibration-proof foundation of the third invention is a horizontal movement restricting member (for example, described later) that regulates the horizontal movement of the floating foundation on the ground or bottom plate concrete between the wall surface of the floating foundation and the pile. The horizontal movement restricting member 50) is provided.

According to the present invention, the horizontal movement restricting member is provided on the ground between the wall surface of the floating foundation body and the pile or on the bottom plate concrete. Therefore, when a large horizontal force acts on the floating foundation due to an earthquake, the floating foundation comes into contact with the horizontal movement restricting member, so that the horizontal movement of the floating foundation can be suppressed. In addition, since the horizontal movement restricting member is installed inside the floating base body, the degree of freedom in arranging the vibration source can be secured.

In the vibration-proof foundation of the fourth invention, the springs are provided on the upper surface and the lower surface of the floating foundation body, respectively, and the connecting member is inserted into the pile by penetrating the springs up and down. It is characterized by that.

According to the present invention, since springs are provided on the upper surface and the lower surface of the floating base body, the behavior of the vibration source is based on the series spring type as one mass point of the vibration source and the floating base body. It can be regarded as a mass point system vibration system. Therefore, even after the vibration-proof foundation has already been constructed and the vibration source has been installed on the floating foundation, the natural period of the vibration-proof foundation can be adjusted or replaced as appropriate by adjusting or replacing the spring on the upper surface of the floating foundation. Can be easily changed.

According to the present invention, it is possible to provide a vibration-proof foundation in which the natural period of the foundation can be easily adjusted so as to deviate from the natural period of the vibration source even after the vibration source is installed on the foundation.

It is a side view of the vibration-proof foundation which concerns on 1st Embodiment of this invention. FIG. 3 is a sectional view taken along the line AA of the anti-vibration foundation shown in FIG. It is an enlarged sectional view of the part surrounded by the broken line C of the anti-vibration foundation shown in FIG. It is a figure which shows the parameter analysis result about the vibration reduction effect by the disc spring which constitutes the vibration-proof foundation. It is a partially enlarged sectional view of the vibration isolation foundation which concerns on 2nd Embodiment of this invention. It is a plan view and a partially enlarged sectional view of the vibration-proof foundation which concerns on 3rd Embodiment of this invention. It is a partially enlarged sectional view of the vibration-proof foundation which concerns on 4th Embodiment of this invention.

The present invention is a floating foundation type anti-vibration foundation structure for reducing the vibration of a vibration generating machine. The first embodiment is a floating foundation model (FIGS. 1 to 3) in which a notch is provided on the lower peripheral edge of a floating foundation on which a vibration generating machine is installed, and the notch is supported by a pile via a spring. be. The second embodiment is a floating foundation type (FIG. 5) in which springs are arranged on the upper surface and the lower surface of the floating foundation body, and the floating foundation body and the pile are connected via the upper and lower springs. The third and fourth embodiments are floating foundation types (FIGS. 6 and 7) in which the floating foundation body and the pile are connected via a spring without providing a notch in the floating foundation body.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, the same components will be designated by the same reference numerals, and the description thereof will be omitted or simplified.
[First Embodiment]
FIG. 1 is a side view of the vibration isolation foundation 1 according to the first embodiment of the present invention. FIG. 2 is a sectional view taken along the line AA of the anti-vibration foundation 1 of FIG.
The vibration-proof foundation 1 reduces the vibration transmitted from the vibration generating machine 3 to the ground 2, and is built on the ground 2. A vibration generating machine 3 as a vibration generating source is installed on the vibration isolating foundation 1.

The anti-vibration foundation 1 is provided on the bottom plate concrete 4 placed on the surface of the ground 2, a plurality of tubular piles 10 embedded in the ground 2 through the bottom plate concrete 4, and the upper surface of these piles 10. A spring 20 that has been formed, a floating foundation body 30 provided on the spring 20, and a connecting member 40 that is fixed to the floating foundation body 30 and penetrates the spring 20 up and down and is vertically and vertically inserted into the pile 10. The bottom plate concrete 4 is provided with a horizontal movement restricting member 50 that regulates the horizontal movement of the floating foundation body 30. The vibration generating machine 3 is installed on the floating base body 30.

FIG. 3 is an enlarged cross-sectional view of a portion of the anti-vibration foundation 1 of FIG. 1 surrounded by a broken line C.
The floating foundation body 30 has a substantially rectangular parallelepiped shape made of reinforced concrete, and is arranged on the bottom plate concrete 4 with a slight gap 70. The gap 70 between the floating foundation body 30 and the bottom plate concrete 4 has a width such that the floating foundation body 30 does not collide with the bottom plate concrete 4 even when the spring 20 contracts and the floating foundation body 30 sinks. There is.
Further, a notch portion 31 is formed in the lower peripheral peripheral portion of the floating base body 30. The cutout portion 31 is composed of a wall surface 31A and a ceiling surface 31B. A through hole 32 extending vertically is formed at a position of the floating base body 30 directly above the pile 10, and a cylindrical sleeve 33 is attached to the through hole 32.

The pile 10 is arranged along the peripheral edge of the floating foundation body 30. Specifically, this pile 10, which is arranged under the ceiling surface 31B of the notch portion 31 of the floating foundation body 30, is a ready-made concrete pile such as a cylindrical PHC pile (Pretensioned Spun High Strength Concrete Piles). be. As shown in FIG. 3, a steel pile cap 11 is attached to the upper end of the pile 10. The pile cap 11 is provided at the closed portion 12 that closes the inside of the pile 10, a tubular wall portion 13 that extends from the peripheral edge portion of the closed portion 12 along the inner wall surface of the pile 10, and a pile provided at the upper end of the wall portion 13. An annular locking portion 14 that locks to the upper end surface of the 10 is provided.
The spring 20 is configured by laminating a plurality of annular steel disc springs 21. The spring 20 is provided on the locking portion 14 of the pile cap 11 locked to the upper end surface of the pile 10. The number of disc springs 21 constituting the spring 20 may be appropriately determined based on the frequency of the vibration generated by the vibration generating machine 3 and the damping rate of the target vibration.

As shown in FIG. 3, the connecting member 40 includes a cylindrical guide portion 41 extending in the vertical direction and a locking portion 42 formed in a crossguard shape at the upper end of the guide portion 41. The guide portion 41 of the connecting member 40 is inserted into the sleeve 33 of the floating foundation body 30 from above, penetrates the inside of the sleeve 33 and the disc spring 21, and extends to the inside of the pile cap 11 attached to the pile 10. ..

The locking portion 42 of the connecting member 40 is fixed to the floating base body 30 by a bolt 43. This prevents the connecting member 40 from rattling when vibration is generated by the vibration generating machine 3. The bolt 43 can be omitted if it is not needed.
Further, by surface-treating or lubricating the outer peripheral surface of the guide portion 41 of the connecting member 40, the frictional resistance against the wall portion 13 of the sleeve 33, the disc spring 21, and the pile cap 11 is reduced. Between the outer peripheral surface of the guide portion 41 and the sleeve 33, even if the floating foundation body 30 is horizontally displaced during an earthquake, the inner peripheral surface of the sleeve 33 does not collide with the guide portion 41. A gap 71 is formed.
Further, in a state where the guide portion 41 is inserted inside the pile cap 11, a gap 72 is formed between the tip of the guide portion 41 and the closing portion 12 of the pile cap 11. The width of the gap 72 between the tip of the guide portion 41 and the closing portion 12 of the pile cap 11 is about the same as the width of the gap 70 between the floating foundation body 30 and the bottom plate concrete 4, and the spring 20 contracts to cause the guide portion 41 to shrink. Even when it sinks, the tip of the guide portion 41 and the closing portion 12 of the pile cap 11 do not collide with each other.

The horizontal movement restricting member 50 is provided between the wall surface 31A of the cutout portion 31 and the pile 10, and is a wall extending linearly along the four sides of the floating foundation body 30. The horizontal movement restricting member 50 is fixed to the bottom plate concrete 4 with bolts 51. The width of the gap 73 between the outer wall surface of the floating foundation body 30 and the horizontal movement restricting member 50 is narrower than the width of the gap 71 between the inner peripheral surface of the sleeve 33 and the guide portion 41. As a result, when the floating foundation body 30 moves horizontally when an earthquake occurs, the horizontal movement restricting member 50 regulates the horizontal movement of the floating foundation body 30, so that the inner peripheral surface of the sleeve 33 does not collide with the guide portion 41. ing.
The anti-vibration foundation 1 operates as follows. When the vibration generating machine 3 is operated, vibration is generated, and this vibration is damped by the spring 20 and transmitted to the pile 10. At this time, the guide portion 41 of the connecting member 40 moves up and down inside the pile cap 11 attached to the pile 10, so that the floating foundation body 30 vibrates up and down. Further, the guide portion 41 of the connecting member 40 and the horizontal movement restricting member 50 function as a fail-safe mechanism for preventing the floating foundation body 30 from falling from the pile 10 when an earthquake load exceeding an assumption is applied. The floating foundation body 30 is restricted from moving in the horizontal direction.

Further, a jack space 60 for attaching a jack (not shown) is provided in the vicinity of the outside of the pile 10 directly below the cutout portion 31 of the floating base body 30. When performing maintenance of the spring 20, a jack is arranged in the jack space 60, and a reaction force is applied to the bottom plate concrete 4 to support the floating foundation body 30. By providing the bottom plate concrete 4, when the floating foundation body 30 is supported by the jack, the jack is prevented from sinking.

したがって、杭の長期許容支持力Ｒ_ｐは、以下の式（２）により求められる。

Next, an example of the above-mentioned anti-vibration foundation will be described.
The structure of piles and springs is set as follows.
Pile: A PHC pile with a diameter of 300 mm is used. It shall be an embedded pile and shall be supported only by the tip bearing capacity.
Supporting ground for piles: N (value) = 50
Spring: 1 disc spring (outer diameter 250 mm, inner diameter 127 mm, thickness 10 mm, height 7 mm)
The area _Ap of the tip surface of the pile is calculated by the following equation (1).

Therefore, the long-term allowable bearing capacity _Rp of the pile is calculated by the following equation (2).

Assuming that the load when the disc spring is bent by 50% is f _s50 and the amount of bending at this time is t _s50 , f _s50 is 93.6 kN, that is, 9.55 t. Therefore, f _s50 <Rp, and it is determined that the pile does not sink even when the disc spring bends by 50%, for example.
Further, in this case, the spring constant _ks of the disc spring is obtained by the following equation (3).

以上より、皿ばね１枚の防振振動数（固有振動数）ｆ_１は、重力加速度Ｇを９８０（ｃｍ／Ｓ^２）として、以下の式（５）により求められる。

Next, the load _Wp applied to each pile is obtained. Set the vibration generating machine and the floating base as follows.
Floating foundation height h _b : 2m
Weight of vibration generating machine per unit area m: 2t / m ²
Burden area of one pile Al: _1.4m ²
The load W _p applied to one pile is calculated by the following equation (4), where the specific gravity _Sc of the reinforced concrete is 2.4.

From the above, the vibration-proof frequency (natural frequency) f ₁ of one disc spring is obtained by the following equation (5) with the gravitational acceleration G as 980 (cm / S ² ).

同様に、皿ばね３枚を上下に直列に配置した場合の防振振動数（固有振動数）ｆ_３は、以下の式（７）により求められる。

Similarly, the vibration-proof frequency (natural frequency) f ₂ when two disc springs are arranged vertically in series is obtained by the following equation (6).

Similarly, the vibration-proof frequency (natural frequency) f3 when _three disc springs are arranged vertically in series is obtained by the following equation (7).

FIG. 4 is a parameter analysis result regarding the vibration reduction effect of the disc spring, and is a diagram comparing the resonance curves when one disc spring is arranged alone, two disc springs are arranged in series, and three disc springs are arranged in series. Is. In FIG. 4, the horizontal axis is the frequency (Hz) of the vibration generating machine, and the vertical axis is the vibration reduction effect (dB). From FIG. 4, it can be seen that the vibration reducing effect increases as the frequency of the vibration generating machine deviates from the vibration-proof frequency of the disc spring. For example, when the frequency of the vibration generating machine is 25 Hz, the vibration transmitted to the pile can be reduced by 15.1 dB when one disc spring is used alone, and when two disc springs are used in series, the vibration transmitted to the pile is 21. It is estimated that the vibration transmitted to the pile can be reduced by 25.5 dB when three disc springs are used in series.

According to this embodiment, there are the following effects.
(1) Since the pile 10, the spring 20, and the floating base body 30 are arranged in series, the configuration of the spring 10 can be appropriately changed even after the vibration generating machine 3 is installed on the floating base body 30. , The natural period of the anti-vibration foundation can be easily adjusted so as to deviate from the natural period of the vibration generating machine 3.
Further, since the pile 10 is provided under the notch 31 of the floating base body 30, the height of the center of gravity of the vibration generating machine 3 can be lowered as compared with the case where the notch is not provided. Since the distance from the center of gravity to the ground is shortened, the locking force (moment force) acting on the pile 10 can be reduced. As a result, the vibration transmission coefficient propagating to the peripheral ground 2 of the exciting force generated from the vibration generating machine 3 can be suppressed to a low level.
Further, since the pile 10 is provided on the ground 2 and the floating foundation body 30 is supported by the pile 10 via the spring 20, it is not necessary to provide the foundation on the ground as in the conventional double foundation structure, and the cost is reduced. can.

(2) The horizontal movement restricting member 50 is provided on the ground 2 between the wall surface 31A of the notch 31 of the floating foundation body 30 and the pile 10. Therefore, when a large horizontal force acts on the floating foundation body 30 due to an earthquake, the floating foundation body 30 comes into contact with the horizontal movement restricting member 50, so that the horizontal movement of the floating foundation body 30 can be suppressed. Further, since the horizontal movement restricting member 50 is installed inside the floating base body 30, the degree of freedom in arranging the vibration generating machine 3 can be ensured.
(3) Since a jack space 60 is provided near the outside of the pile 10 directly under the cutout portion 31 of the floating base body 30, a jack is arranged in this jack space 60 to support the floating base body 30 to support a spring. The disc spring 21 constituting the 20 can be easily replaced or increased / decreased.
(4) A plurality of disc springs 21 were used as the spring 20. Therefore, since the ready-made product can be used as the disc spring 21, the cost can be reduced. Further, since the disc spring 21 has a small thickness (height), the height of the vibration-proof foundation 1 can be kept low. Further, since the characteristics of the spring 20 can be easily adjusted only by changing the number of disc springs 21, the degree of freedom in designing the anti-vibration foundation 1 is increased.

[Second Embodiment]
FIG. 5 is a partially enlarged cross-sectional view of the anti-vibration foundation 1A according to the second embodiment of the present invention.
The present embodiment is different from the first embodiment in that the springs 20A and 20B are provided on the upper surface and the lower surface of the floating base body 30, respectively.
That is, a step portion 15 is formed at an intermediate height position of the pile 10. A spring 20A is arranged on the stepped portion 15 of the pile 10, and a spring 20B is arranged on the upper end surface of the pile 10. The spring 20A is arranged on the lower surface of the floating base body 30, and the spring 20B is arranged on the upper surface of the floating base body 30.

According to this embodiment, in addition to the above-mentioned (1) to (4), the following effects are obtained.
(5) Since the springs 20A and 20B are provided on the upper surface and the lower surface of the floating base body 30, the behavior of the vibration generating machine 3 is such that the vibration generating machine 3 and the floating base body 30 are combined as one mass point in series. It can be regarded as a one-mass vibration system with a spring type. Therefore, even after the vibration-proof foundation 1 has already been constructed and the vibration generating machine 3 is installed on the floating foundation body 30, the spring 20B on the upper surface of the floating foundation body 30 can be appropriately adjusted or replaced to prevent vibration. The natural period of the shaking foundation 1 can be easily changed.

[Third Embodiment]
FIG. 6 is a plan view and a partially enlarged sectional view of the anti-vibration foundation 1B according to the third embodiment of the present invention.
In the present embodiment, the structures of the floating foundation body 30B and the horizontal movement restricting member 50B are different from those of the first embodiment.
That is, the floating base body 30B is not provided with a notch and has a uniform thickness.
The pile 10 is arranged so that the height position of the upper end surface is flush with the upper surface of the bottom plate concrete 4.
The horizontal movement restricting member 50B has a substantially L-shape in a plan view, and is provided at a pair of diagonally protruding corners of the anti-vibration foundation 1B. The pair of horizontal movement restricting members 50B are provided on the bottom plate concrete 4 on the outer side of the floating foundation body 30B. Each of the horizontal movement restricting members 50B covers two adjacent side surfaces of the floating base body 30B, and a gap 73 is secured between each horizontal movement restricting member 50B and the floating base body 30B.

According to this embodiment, in addition to the above-mentioned (1) and (4), the following effects are obtained.
(6) By installing a pair of substantially L-shaped horizontal movement restricting members 50B at the protruding corners of the floating base body 30B, it is possible to regulate the movement of the floating base body 30B in two directions with one horizontal movement restricting member 50B. be.
(7) Since the floating foundation body 30B is not provided with a notch, the construction cost of the floating foundation body 30B can be reduced.

[Fourth Embodiment]
FIG. 7 is a partially enlarged cross-sectional view of the vibration-proof foundation 1C according to the fourth embodiment of the present invention.
The present embodiment is different from the third embodiment in that the height position of the upper end surface of the pile 10 is lower than the upper surface of the bottom plate concrete 4.
According to this embodiment, in addition to the above-mentioned (1), (4), (6), and (7), the following effects are obtained.
(8) Since the height position of the upper end surface of the pile 10 is lower than the upper surface of the bottom plate concrete 4, the width of the gap 70 between the upper surface of the bottom plate concrete 4 and the floating foundation body 30B can be reduced. Therefore, the height position of the upper surface of the floating base body 30B can be lowered as much as possible, and the operability of the vibration generating machine 3 installed on the upper surface of the floating base body 30B can be improved. Further, since the height positions of the floating foundation body 30B and the vibration generating machine 3 can be lowered, the horizontal load acting at the time of an earthquake can be reduced, and excellent structural safety can be ensured.

The present invention is not limited to the above-described embodiment, and modifications, improvements, and the like to the extent that the object of the present invention can be achieved are included in the present invention.
For example, the spring 20 may be covered with a cover so that the spring 20 is not exposed to wind and rain.
Further, in each of the above-described embodiments, the disc spring 21 is used as the spring 20, but the present invention is not limited to this, and a coil spring may be used when it is not necessary to lower the spring height.
Further, in the first and second embodiments, the jack space 60 is provided in the vicinity of the pile 10, but the present invention is not limited to this, and the jack space 60 may not be provided in the vicinity of the pile 10.
Further, in the third embodiment, as shown in FIG. 6, a pair of horizontal movement restricting members 50B are provided at the diagonally protruding corners of the anti-vibration foundation 1B, but the present invention is not limited to this, and the horizontal movement restricting member 50B is prevented. A total of four may be provided at all the protruding corners of the shaking foundation 1B.
Further, in each of the above-described embodiments, the horizontal movement restricting members 50 and 50B are provided on the bottom plate concrete 4, but the present invention is not limited to this, and the horizontal movement restricting members 50 and 50B may be provided on the ground 2.

1, 1A, 1B, 1C ... Anti-vibration foundation 2 ... Ground 3 ... Vibration generating machine (vibration generation source)
4 ... Bottom plate concrete 10 ... Pile 11 ... Pile cap 12 ... Closure part 13 ... Wall part 14 ... Locking part 15 ... Step part 20, 20A, 20B ... Spring 21 ... Belleville spring 30, 30B ... Floating foundation 31 ... Notch Part 31A ... Wall surface 31B ... Ceiling surface 32 ... Through hole 33 ... Sleeve 40 ... Connecting member 41 ... Guide part 42 ... Locking part 43 ... Bolt 50, 50B ... Horizontal movement restricting member 51 ... Bolt 60 ... Jack space 70 ... Floating foundation Gap between the body and the bottom plate concrete 71 ... Gap between the sleeve and the guide part 72 ... Gap between the guide part and the closed part of the pile cap 73 ... Gap between the floating foundation and the horizontal movement restricting member

Claims (3)

It is a vibration-proof foundation that reduces the vibration transmitted from the vibration source to the ground.
The bottom plate concrete provided on the ground and
A plurality of piles buried in the ground and extending upward through the bottom plate concrete ,
A disc spring that is installed on the upper surface of the pile and can expand and contract up and down,
A concrete floating foundation provided on the disc spring and located above the bottom plate concrete ,
A cylindrical guide portion that penetrates the inside of the disc spring up and down and is inserted vertically into the inside of the pile, and a crossguard-shaped guide portion formed at the upper end of the guide portion and fixed to the floating base body. It is provided with a locking portion and a connecting member to have.
The plurality of piles are a vibration-proof foundation characterized in that they are provided along the peripheral edge portion of the floating foundation body in a plan view . The floating base body has a substantially rectangular parallelepiped shape and has a substantially rectangular parallelepiped shape.
A notch is formed on the lower peripheral edge of the floating base body.
The vibration-proof foundation according to claim 1, wherein the disc spring is provided between the ceiling surface of the notch and the upper surface of the pile. Claim 1 is characterized in that a horizontal movement restricting member for restricting the horizontal movement of the floating foundation body is provided on the ground between the wall surface of the floating foundation body and the pile or on the bottom plate concrete. Or the anti-vibration foundation described in 2 .

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