JP2013249942A - Rolling prevention mechanism and vibration-proof pedestal including the mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rolling prevention mechanism preventing an upper pedestal of a vibration-proof pedestal from largely rolling and tilting together with a device against a giant earthquake associated with three-dimensional shaking in a horizontal direction and a vertical direction.SOLUTION: A rolling prevention mechanism includes: a lower quake-reducing base table (21) installed on an upper face of a lower pedestal (1) of a vibration-proof pedestal (A); an upper quake-reducing base table (22) installed on a lower face of an upper pedestal (10) opposing to the lower quake-reducing base table (21); and a quake-reducing member (20) fitted into recesses (23), (24) recessed in opposing faces of the upper quake-reducing base table (22) and the lower quake-reducing base table (21). An upper part and a lower part of the quake-reducing member (20) are fitted into the recesses (23), (24), respectively, and an outer layer (20a) at least in contact with the recesses (23), (24) is constituted from an elastic member.

Description

  The present invention relates to a rolling prevention mechanism that can effectively prevent a swing and a fall that exceed the allowable range of a load placed on a vibration isolator even if a large earthquake occurs, and a vibration isolator with the mechanism.

  Conventionally, as an anti-vibration device for a building power supply or mechanical equipment installed in a factory, an anti-vibration stand has been widely used as a device for blocking vibration generated from these devices or vibration transmitted from the installation surface to these devices. .

  This anti-vibration base is composed of a lower base installed on the floor, an upper base on which a device as a load is placed, and a plurality of anti-vibration mounts installed between them, and coil springs supporting the upper base as main components. And a stopper mechanism that suppresses the relative movement in the horizontal direction and the vertical direction between the upper and lower frames within a certain range. As a result, the normal vibration generated from the device or the vibration in the reverse direction (vibration from the floor side) as described above, the vibration between the upper frame and the lower frame is caused by the action of the coil spring of the vibration isolator. Transmission can be effectively suppressed.

  As described above, as a reverse sway, the stopper member and the seismic frame are affected even by a typhoon-like wind pressure or a small-scale earthquake. The horizontal or vertical relative movement between the upper and lower mounts is restricted within a certain range by the stopper mechanism configured in this way, and the upper mount is tilted by shaking greatly beyond the allowable value. I am trying to regulate so that it won't fall.

  In that case, when the seismic frame collides with the stopper member, a large impact is applied, and there is a risk of damaging the device that is the load.Therefore, a pair of seismic frames are provided above and below the seismic frame with a gap around the stopper member. The elastic disk member was installed, so that the load was greatly shaken by wind pressure and small-scale earthquakes as well as when starting and stopping the load, and the earthquake-resistant elastic member attached to the stopper member worked against the earthquake-resistant frame. However, there has been proposed one that does not significantly impair the vibration isolation effect of the vibration isolation member (Patent Document 1).

JP-A-7-208542

  However, according to the present invention, when the upper frame is swung and tilted, the earthquake-resistant elastic member runs idle in the gap until the earthquake-resistant elastic member elastically contacts the earthquake-resistant frame due to the presence of the gap. When contacting the seismic frame, although it is an elastic member, it impacts the seismic frame impactively. This impact is not a problem in the case of normal wind pressure, vibration, or shaking, but in the case of a huge earthquake, it becomes a huge impact and not only breaks the stopper mechanism, but also the upper frame falls down with the equipment. . The stopper member according to the present invention is effective to some extent against vertical vibration and rolling in the direction of compressing the rolling elastic member for earthquake resistance, but has little effect on horizontal shaking.

  The present invention has been made in view of such problems, and with respect to a huge earthquake accompanied by three-dimensional shaking in the horizontal direction and the vertical direction, the upper frame rolls and tilts greatly together with the device, and the device is damaged. An object of the present invention is to provide a rolling prevention mechanism and a vibration isolator with the same mechanism.

The invention described in claim 1 includes a lower vibration isolation base (21) installed on the upper surface of the lower base (1) of the vibration isolation base (A), and an upper part facing the lower vibration reduction base (21). An upper damping base (22) installed on the underside of the gantry (10), and a recess (23) recessed in the opposing surface of the upper damping base (22) and the lower damping base (21), (24) and a vibration-reducing member (20) fitted in,
The upper and lower parts of the vibration-reducing member (20) are fitted into the recesses (23) and (24), respectively, and at least the outer layer (20a) of the vibration-reducing member (20) in contact with the recesses (23) and (24) is elastic. It is a rolling prevention mechanism (B) characterized by comprising a member.

  The invention according to claim 2 relates to the first embodiment of the vibration reducing member (20), and the elastic material having different longitudinal elastic modulus for the outer layer (20a) and the inner layer (20b) of the vibration reducing member (20). It is characterized by comprising.

  The invention described in claim 3 relates to the second embodiment of the vibration damping member (20), wherein the vibration damping member (20) is a hollow body and its outer layer (20a) is made of an elastic material. Features.

  The invention according to claim 4 relates to a third embodiment of the vibration reducing member (20), and the outer layer (20a) of the vibration reducing member (20) includes a spring material (20e) for supporting the inner layer (20b). It is characterized by that.

  The invention according to claim 5 relates to a fourth embodiment of the vibration reducing member (20), wherein the outer layer (20a) of the vibration reducing member (20) is constituted by a spring material (20e) that supports the inner layer (20b). It is characterized by that.

The invention according to claim 6 is a vibration isolator (A) to which the rolling prevention mechanism (B) according to claims 1 to 5 is added,
A lower frame (1) installed on the floor (50);
An upper frame (10) on which a load (W) is installed;
A vibration isolator (30) installed between the upper frame (10) and the lower frame (1) and supporting the upper frame (10);
The rolling prevention mechanism (B) according to claim 1, which is installed between the upper frame (10) and the lower frame (1).

  Each of the upper and lower parts of the vibration-reducing member (20) of the rolling prevention mechanism (B) of the present invention is fitted into the recesses (23), (24), and at least the outer layer (20a) in contact with the recesses (23), (24) ) Is made of an elastic member, so that a large three-dimensional vibration is input to the anti-vibration frame (A) and a large three-dimensional relative displacement between the upper frame (10) and the lower frame (1). When this occurs, the stopper member does not collide with the elastic member for earthquake resistance as in the past, and the vibration reducing member (20) is greatly bent and vibrates from the beginning of the three-dimensional relative deviation. Part of the energy is converted to heat. As a result, the amount of flexure of the vibration isolator (30) is limited by the amount of flexure of the anti-vibration member (20), so that the shaking is greatly suppressed and rolling does not cause a large inclination. As a result, in addition to avoiding damage to the mounting load (W) itself mounted on the upper frame (10), it is connected to a member for connection with an external device, for example, a terminal (T) There is no such thing as external wiring breaking.

  Further, when the outer layer (20a) of the vibration reducing member (20) is made of a soft material compared to the inner layer (20b), or a hollow body, the outer layer (20a) is made of an elastic material. In this case, as shown in FIGS. 4 and 5, the outer layer (20a) is pushed out when it is greatly compressed, and the pushed-up portions of the upper and lower vibration-reducing bases (21) and (22) are in close proximity. The resistance is rapidly increased by being sandwiched between the opposing surfaces, thereby further enhancing the rolling prevention effect. On the contrary, when the inner layer (20b) of the vibration-reducing member (20) is made of a softer material than the outer layer (20a), the inner layer (20b) is greatly deformed together with the outer layer (20a), and similarly the rolling prevention effect is achieved. Further increase.

It is a front view of the vibration isolator stand equipped with the rolling prevention mechanism of this invention. It is a perspective view of the vibration isolator used for FIG. It is 3A-3A sectional drawing of FIG. It is a figure from the front direction when the vibration damping member of FIG. 3 is compressed. It is sectional drawing from the right angle direction of FIG. It is a front view of 2nd Example of the rolling prevention mechanism of this invention. It is sectional drawing from the right angle direction of FIG. FIG. 8 is a central sectional view of FIG. 7. It is a center sectional view of the 3rd example of the rolling prevention mechanism of the present invention. FIG. 10 is a plan view of FIG. 8 or 9. It is an expanded sectional view of the stopper mechanism used for the present invention.

  The present invention will be described below with reference to the drawings. The anti-vibration frame (A) includes a lower frame (1), an upper frame (10), an anti-vibration tool (30), a rolling prevention mechanism (B), and a stopper mechanism (D) provided as necessary.

  The lower frame (1) has a rectangular shape with a lower corner member (2) arranged at the four corners and two lower and lower frames (3) and (4) welded between the opposing surfaces of the lower corner member (2). It is configured. The lower corner member (2) is composed of an L-shaped side piece (2a), a lower piece (2b) welded to the upper and lower sides thereof, and an upper piece (2c). An anchor bolt hole is formed in the lower piece (2b). (2d) is drilled.

  The upper frame (10), like the lower frame (1), combines two upper and lower upper frames (13, 14) into a rectangular shape, and an upper corner member ( 12) is welded. The upper corner member (12) includes an L-shaped side piece (12a), a lower piece (12b) welded to the upper and lower sides thereof, and an upper piece (12c).

  Then, the stopper bolt (41) of the stopper mechanism (D) is inserted into the lower piece (12b) of the upper frame (10) and the upper piece (2c) of the lower frame (1), and the lower corner member ( 2) The nut is fixed to the upper piece (2c). The upper insertion portion of the stopper bolt (41) is inserted in a non-contact manner into a rubber washer (42) provided in a through hole (12t) formed in the lower piece (12b) of the upper frame (10). . A stopper nut (45) is attached to the insertion end of the stopper bolt (41) with a double nut hook.

  The stopper mechanism (D) of the present embodiment has a thin vibration reducing washer that does not come into contact between the lower piece (12b) of the upper frame (10) and the upper piece (2c) of the lower frame (1) ( 43) is screwed onto the stopper bolt (41).

  A mounting frame (5) (15) is suspended between the upper frame (3) (13) on the longer side of the upper and lower mounts (1) (10) as necessary. A mechanism (D) is provided as necessary. The mounting frames (5) and (15) and the stopper mechanism (D) at the inner corner are provided as necessary when the upper and lower mounts (1) and (10) are long. Although not shown, when the weight of the load (W) is large, the inside of the upper frame (10) is filled with concrete.

  The vibration isolator (30) has a well-known structure, and includes a base (31) and a bellows formed on the base (31) and having a hollow, lower surface opening top surface closed and a circumferential multistage bellows. It consists of a member (32) and a coil spring (33) provided in the bellows member (32), and the lower frame (3) by a slide groove (34) provided in the bottom surface of the base (31) (4) The upper frame (10) is supported by the coil spring (33) of the bellows member (32). The vibration isolator (30) is installed at a plurality of locations on the lower frames (3) and (4).

  As shown in FIGS. 3 to 5, the first embodiment of the rolling prevention mechanism (B) includes a vibration reducing member (20) and upper and lower vibration reducing bases (21) and (22). The upper and lower anti-vibration bases (21) and (22) are vertically symmetric, and the opposite surfaces have recesses (23) and (24) for accommodating the upper and lower parts of the vibration-reducing member (20), respectively. It is recessed. The shape of the recesses (23) and (24) is formed in accordance with the outer shape of the seismic reduction member (20) to be accommodated. Therefore, the stored vibration reducing member (20) and the recesses (23) and (24) are in contact with each other. In the illustrated embodiment, the shape of the recesses (23) and (24) is a concave spherical surface slightly shallower than the hemisphere. Insertion grooves (25) and (26) are recessed in the same direction on the upper and lower surfaces of the upper and lower anti-vibration bases (21) and (22), and a pair constituting the insertion grooves (25) and (26). Through holes (27) and (28) are formed in the standing pieces (25a) and (26a).

  The anti-seismic member (20) is a sphere, and a material such as a rubber-like elastic material or low-rebound rubber, metal, resin, etc., is used as appropriate, but rubber and one type of rebound force are almost all. A low resilience rubber is preferable from the viewpoint of vibration absorption. In the case of metal, a hollow body is preferable because it needs to be crushed when an external force is input. Of course, a hollow body can be used even in the case of rubber.

  Further, as described above, the entire vibration-reducing member (20) may be composed of an elastic material or the above-mentioned material, or it may be composed of a contact outer layer (20a) and an inner layer (20b), and the outer layer (20a) may be an inner layer (20b). ) It may be made of a softer material or vice versa. Although not shown, an elastic protrusion may be provided on the surface of the vibration reducing member (20). In this case, it is desirable that the elastic protrusion is made of a low rebound rubber. Of course, the elastic protrusions may be formed of a hard material, and the inner layer (20b) may be formed of a low-rebound rubber that is softer than the elastic protrusions. In any case, it is preferable to change the hardness (or longitudinal elastic modulus) of the contact outer layer (20a) and the inner layer (20b). The inner layer (20b) is preferably formed of a plurality of layers instead of a single layer, and the hardness (or longitudinal elastic modulus) of each layer is preferably changed from the viewpoint of absorption of vibration energy. The above case is a case where the vibration-reducing member (20) is a sphere, but this can be made into a roller shape, a cube, a rectangular parallelepiped, a truncated cone, a truncated pyramid or other necessary shapes.

  The anti-vibration mount (A) according to the present invention includes a floor surface (50) with anchor bolts (51) planted on the floor surface (50) using the anchor bolt holes (2d) of the corner member (2). The anti-rolling mechanism (B) on the inner side of the anti-vibration tool (30) provided between the upper and lower bases (1) and (10) of the anti-vibration base (A) Is installed. In this embodiment, four places are installed between the long upper and lower frames (3) and (13), but it is of course possible to further install them as necessary.

  The upper frame (10) is placed and supported on the vibration isolator (30), and the load (W) placed on the upper frame (10) using the mounting holes (not shown) of the upper frame (10). Is fixed. When the load (W) is an electrical facility such as a transformer, external wiring (not shown) is connected to the terminal (T) on the upper surface. The coil spring (33) of the vibration isolator (30) bends to a predetermined height due to the weight of the load (W), and the anti-seismic member (20) of the rolling prevention mechanism (B) at that position is the anti-vibration member (20). It arrange | positions so that it may touch lightly to the contact surface of the receiving recesses (23) and (24).

  Under such installation conditions, when a huge earthquake hits the floor (50), the floor (50) shakes greatly in three dimensions, and the lower frame (1) fixed to the floor (50) due to the influence, A three-dimensional relative displacement tends to occur between the upper frame (10) supported by the vibration isolator (30) and attached with a heavy load (W). As a result, when the load (W) is an electrical facility such as the above-mentioned transformer, in the conventional case, this is greatly shaken and does not fall down, but the external wiring connected to the terminal (T) on the top surface is torn off, etc. Major damage may occur. In the present invention, the upper and lower vibration-reducing bases (21), (22) try to move relative to each other in the shearing direction or in the vertical compression direction, but at that time, the recesses where the vibration-reducing members (20) are in contact ( 23) Since the outer layer (20a) of the vibration-reducing member (20) is in contact with the contact surface of the recesses (23) and (24) from the beginning as described above, the impact surface collides with the contact surface of (24). Without the occurrence, the vibration-reducing member (20) is repeatedly pressed by the contact surfaces of the recesses (23) and (24), and the vibration-reducing member (20) is deformed by shearing or compression.

  4 and 5 are drawings showing a state in which the vibration reducing member (20) is formed of a hollow body or the outer layer (20a) is softer than the inner layer (20b) and is compressed. The pressed vibration-reducing member (20) is crushed and gradually deformed, and part of it is pushed out from the gap between the upper and lower vibration-reducing bases (21, 22), and the outer layer (20a) is It is sandwiched between the opposing surfaces of the lower vibration reduction base (21) (22). As a result, a large resistance force is generated in the proximity movement direction of the opposing surfaces of the upper and lower anti-vibration bases (21) and (22), the amount of energy consumption increases rapidly, and an efficient large relative displacement, that is, a large rolling Can be suppressed. In other words, the amount of movement of the upper frame (10) that causes a three-dimensional relative displacement for both loads (W) is basically limited to the amount of deformation of the vibration reducing member (20). If the vibration-reducing member (20) is a hollow body, the amount of air supplied to the inside is adjusted by adjusting the amount of air supplied from the air supply part (20k) provided on the side, such as a valve attached to a bicycle tube. The pressure can be adjusted. When the internal air pressure is high, the deformation resistance increases.

  If the amount of deformation of the vibration reducing member (20) exceeds the allowable displacement of the stopper mechanism (D), the stopper bolt (41) collides with the rubber washer (42) and the stopper mechanism (D) The stopper function acts, and the large three-dimensional relative displacement of the upper frame (10) with respect to the lower frame (1) is suppressed, and the swing of the load (W) is minimized. In this case, a considerable part of the vibration energy is converted into heat by the deformation of the above-mentioned vibration reducing member (20), and the impact energy generated in the stopper mechanism (D) is reduced by that amount, and the shock is alleviated. .

  In addition, when the vibration reduction washer (43) is provided, the vibration reduction washer (43) contacts the upper rubber washer (42) and is deformed and damaged, and the impact energy is further reduced by this deformation or damage, and rolling. Prevents severe shaking (rolling) in cooperation with the prevention mechanism (B). In particular, when the load (W) is a transformer as described above, the connection between the terminal (T) of the transformer and the cord of the external device is not damaged.

  In the above embodiment, the case where the outer layer (20a) is softer than the inner layer (20b) is shown. However, the present invention is not limited to this, and conversely, the outer layer (20a) may be harder than the inner layer (20b). In this case, the inner layer (20b) is deformed from the outer layer (20a) and the same effect is exhibited.

  6 to 8 show a second embodiment of the vibration-reducing member (20). The vibration-reducing member (20) is composed of an inner layer (20b) and a spring material (20e) constituting the outer layer (20a). The inner layer (20b) is spherical and made of, for example, hard metal or resin, and has a structure in which the upper and lower portions are supported by the spring material (20e) from four sides in the embodiment. Of course, you may make it support with a spring material (20e) from the direction beyond it. As a result, the vibration-reducing member (20) that has been subjected to pressure as described above is reduced in impact energy and mitigated by the deformation of the spring material (20e). In this case, the hemispherical inner shell member (20b1) covering the upper and lower outer surfaces of the inner layer (20b), and the hemispheric outer shell member (20a1) covering the inner surfaces of the upper and lower recesses (23) and (24) When the inner and outer layer side shell members (20a1) (20b1) are made of hard metal or resin, the relative movement by sliding on the surface of the inner layer (20b) made of the same hard metal or resin is also possible. Will do. Conversely, if both the inner and outer layer side shell members (20a1) and (20b1) are soft members, greater impact energy reduction and impact mitigation are realized in cooperation with the bending of the spring material (20e). 6 and 7, the shell members (20a1) and (20b1) are provided on both sides of the inner and outer layers, but only the inner layer side shell member (20b1) may be used as shown in FIG. On the contrary, only the outer layer side shell member (20a1) may be used.

  FIG. 9 shows a third embodiment of the vibration-reducing member (20). The outer layer (20a) is hemispherical, for example, a soft member (20n) such as rubber, low-resilience rubber or elastomer, and a spring material incorporated therein. (20e). The support direction of the spring material (20e) is the same as in the second embodiment. As for the shell member, only the inner layer side shell member (20b1) is shown in the illustrated embodiment, or this point is also the same as the second embodiment. In this case, the impact energy reduction and impact mitigating action by the soft member (20n) are added.

(A): Anti-vibration frame, (B): Rolling prevention mechanism, (D): Stopper mechanism, (T): Terminal, (W): Load, (1): Lower frame, (2): Lower corner member, (2a): L-shaped side piece, (2b): Lower piece, (2c): Upper piece, (2d): Anchor bolt hole, (3) (4): Lower frame, (5): Mounting frame, ( 10): Upper frame, (12): Upper corner member, (12a): L-shaped side piece, (12b): Lower piece, (12c): Upper piece, (12t): Through hole, (13) (14 ): Upper frame, (15): Mounting frame, (20): Damping member, (20a): Outer layer, (20a1): Outer layer side shell member, (20b): Inner layer, (20b1): Inner layer side shell member, (20e): Spring material, (20n): Soft member, (21): Lower vibration reduction base, (20e): Spring material, (22): Upper vibration reduction base, (23) (24): Recess, (25) (26): Insertion groove, (25a) (26a): Standing piece, (27) (28): Through hole, (30): Vibration isolator, (31): Base, (32): Bellows Member, (33): Coil spring, (34): Slide groove, (41): Stopper bolt, (42): Rubber washer, (43) : Damping washer, (45): Retaining nut, (50): Floor surface.

Claims (6)

Lower vibration reduction base installed on the upper surface of the lower frame of the vibration isolation frame, upper vibration reduction frame installed on the lower surface of the upper frame opposite to the lower vibration reduction frame, upper vibration reduction frame and lower It is composed of a seismic-reducing member that is fitted in a recess that is recessed in the opposing surface of the seismic-reduction base,
An anti-rolling mechanism, wherein each of an upper part and a lower part of a vibration reducing member is fitted in a recess, and at least an outer layer of the vibration reducing member in contact with the recess is made of an elastic member.   The rolling prevention mechanism according to claim 1, wherein the outer layer and the inner layer of the vibration reducing member are made of a resilient material having different longitudinal elastic modulus.   The rolling preventing mechanism according to claim 1 or 2, wherein the vibration reducing member is a hollow body, and an outer layer thereof is made of an elastic material.   The rolling prevention mechanism according to claim 1 or 2, wherein the outer layer of the vibration reducing member includes a spring material that supports the inner layer.   The rolling prevention mechanism according to claim 1 or 2, wherein the outer layer of the vibration reducing member is formed of a spring material that supports the inner layer. A lower frame installed on the floor,
An upper frame on which the load is installed;
A vibration isolator installed between the upper frame and the lower frame and supporting the upper frame;
An anti-vibration gantry comprising the rolling prevention mechanism according to any one of claims 1 to 5 installed between an upper gantry and a lower gantry.

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