KR101702449B1 - Earthquake-Resistant Mount for Distributing Board Using Vibration Proof Pad - Google Patents

Abstract

The earthquake-resistant mount of the present invention comprises a lower base steel plate portion, a vibration-proof rubber pad portion, a coil spring portion, an upper base steel plate portion, and a connecting bolt stopper portion. According to the earthquake-resistant mount for a distribution board using a vibration-proof pad of the present invention, it has improved durability of a vibration-proof rubber pad by using a coil spring and secured safety of a distribution board and, moreover, its structure is simple and its production cost is low.

Description

{Earthquake-Resistant Mount for Distributing Board Using Vibration Proof Pad}

The present invention relates to an earthquake-resistant mount for a power distribution panel (including a high-low voltage switchgear, a motor control panel, and a distribution panel) using a vibration-proof pad, and more particularly, The vibration damping rubber pad is used as a main vibration damping and the elastic force of the vibration damping pad is supplemented by using a coil spring to improve the durability of the vibration damping rubber pad. To an earthquake-resistant mount for a power distribution system using a pad.

An earthquake is a phenomenon in which the energy inside the earth comes to the surface and the earth is divided and shaken and acts as a load on the building.

The seismic load is the inertial force due to the ground motion, and the building may be horizontal or vertical irregular, or the unexpected action of the non-structural element may cause the load to be concentrated on a specific layer or a specific structural member.

Therefore, all structures subject to the earthquake-proof design and their constituent members should be provided with a certain strength to withstand the earthquake and ductility capable of flexibly responding to the earthquake shake .

Seismic design means a design considering additional earthquake load in designing to maintain the safety and function of the structure even after earthquake or earthquake. However, it is not designed to prevent damage to all expected earthquakes, The following three items are targeted.

 Structural and non-structural members should not be damaged in small-scale earthquakes. In mid-scale earthquakes, damage to non-structural members should not be allowed. Structural members should not be damaged. And should not cause injury to persons.

The requirement for earthquake-resistant design was introduced in 1988, and the earthquake-resistant design obligation was applied to six or more floors or buildings with a floor area of 100,000 or more. In 1995, the building was expanded from more than 6 floors to more than 10,000 floors. It has been expanded to more than 1,000, and by 2015, seismic design has been mandated for all buildings with more than three floors or more than 500.

In general, telecommunication panels such as switchgear, surveillance panel, distribution panel and telecommunication panel are installed on the lower frame and installed on the concrete foundation floor or floor fixing plate because they are bulky and have a large load.

Therefore, when an earthquake occurs in a building with such a telecommunication panel, damage to the panel occurs. The magnitude of the seismic force affecting the building in case of an earthquake varies depending on the structural characteristics such as the height, shape and material of the building, It is necessary to protect the panel from earthquakes. In order to protect the panel, an earthquake-proof earthquake-proof mount is required.

In particular, in areas where systems are required to be processed online / real-time, such as information and communication panels, especially in areas with high publicity, in our country, which is close to Japan where earthquakes are frequent, There is a desperate need.

Therefore, the earthquake disaster countermeasures law (Law 9636) and the earthquake disaster countermeasures enforcement ordinance (Presidential order 21362) require all earthquake disaster countermeasures law (Law 9636) and earthquake disaster countermeasures enforcement order (Presidential decree 21362) to establish earthquake countermeasures for all public buildings and facilities.

The existing earthquake-proof seismic mount is a high-priced device based on vibration and damping, which is unnecessarily over-installed in Korea where earthquakes do not occur above a certain scale.

In addition, durability is a problem when using only a vibration proof rubber pad or a compression spring, and there is a problem that a power transmission and distribution board installed on the upper part is conducted due to the conduction moment.

1. Korean Registered Patent No. 10-1375336 (Registration Date: Mar. 1, 2014) 2. Korean Patent Registration No. 10-0927954 (Registration Date: November 16, 2009) Rubber damper mount for vibration proof 3. Korean Patent Registration No. 10-1393020 (Registration date: April 30, 2014) Damping drive unit mount 4. Korean Patent Registration No. 10-1632256 (Registration Date: June 15, 2016) Seismic Switchgear 5. Korean Registered Patent No. 10-1505629 (Registration Date: Mar. 18, 2015) Stands for installing instruments having vibration-proof and vibration-proof performance

In order to solve the above-mentioned problems, the present invention uses a vibration-proof rubber pad for absorbing vibrations or shocks when a natural disaster or an earthquake occurs to secure the safety of the switchboard, and uses a coil spring to improve the durability of the vibration- The present invention provides an earthquake-proof mount for use in a power distribution system using a vibration-proof pad that compensates for the elastic force of the vibration-proof pad and the vertical displacement over a certain range is obtained by the strength of the connection bolt stopper.

The earthquake-proof mount of the present invention is installed at a corner portion between a lower frame of a switchboard and a bottom frame of a concrete foundation, absorbing vibrations and shocks to ensure safety of a power and navigation panel when a natural disaster or an earthquake occurs, A lower base steel plate for holding an external force due to the self weight and seismic force of the switchgear and transmitting the self weight and seismic force of the switchgear to the bottom frame; An anti-vibration rubber pad portion provided on an upper portion of the lower base steel plate portion to attenuate a vertical displacement caused by vibration or seismic force to a vibration absorption force to reduce an impact transmitted to the transmission / A vibration damping rubber pad portion disposed at the center of the inside of the vibration damping rubber pad portion to attenuate a vertical displacement generated due to vibration or seismic force by elasticity of a spring to reduce an impact transmitted to the transmission / A coil spring portion for maintaining the durability of the pad portion; An upper base steel plate portion formed on the vibration proof rubber pad portion and the coil spring portion and coupled to a lower portion of the frame of the power switchboard to transmit an external force received by the power switchboard to the lower portion; The base bottom steel plate portion, the vibration proof rubber pad portion, and the upper base steel plate portion are vertically arranged to prevent deviation, and the two-to-four base steel plate portions, which can prevent the vertical momentary displacement of the earthquake- And a connecting bolt stopper portion comprising a connecting bolt stopper.

A coil spring portion support portion having a constant height and a constant diameter is formed at a central portion of the lower base steel plate portion so that the coil spring portion receives uniform vibration or seismic force from the center and is not separated from the inside of the anti- The lower base steel plate portion is provided with a bottom anti-vibration rubber pad separation preventing groove having a predetermined depth so that the anti-vibration rubber pad portion is not separated from a predetermined position, A connecting bolt stopper insertion hole is formed.

The anti-vibration rubber pads are formed of a plurality of anti-vibration rubber pads in order to disperse seismic force and improve durability.

The vibration damping rubber pad has a tensile strength of 20 MPa or more, an elongation of 500% or more, a hardness of 60 Hs or more, and a permanent compression toughness of 35% [(100 ± 1) ° C, 22Hr} or less.

The anti-vibration rubber pad has a coil spring portion mounting hole into which the coil spring portion is inserted, and a plurality of pad connecting bolt stopper through holes through which the connecting bolt stopper passes.

The coil spring portion is a cylindrical compression spring type so as to uniformly receive the compression load due to the seismic force in the direction of the coil center line.

The repulsive force limit of the coil spring portion is limited to the height of the anti-vibration rubber pad portion to maintain the durability of the anti-vibration rubber pad portion.

An upper vibration damping rubber pad detachment groove is formed in the upper base steel plate to prevent the vibration damping rubber pad from being separated from a predetermined position and an upper connection bolt stopper through hole is formed in the same number as the connection bolt stopper through which the connection bolt stopper passes do.

Wherein the connection bolt stopper includes a bolt head engaged with the lower base steel plate and a bolt body formed of a bolt body connected to the bolt head and formed with a male screw; And a stopper nut part which is inserted into the connecting bolt part to limit the vertical displacement of the earthquake-resistant mount in an upper direction and is made of two or more stopper nuts so as not to be loosened by vibration.

The problem to be solved by the present invention can be solved by the earthquake-proof mount described above.

According to the vibration damping mount for transmission and transmission using the vibration damping pad of the present invention, the durability of the vibration damping rubber pad for attenuating the seismic force is improved by using the coil spring, and the vertical displacement and the conduction moment over a certain range are overcome by the strength of the connection bolt stopper, It is possible to secure the safety of the installed switchboard, and the structure is simple and the production cost is low.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an overall front view including a partial sectional view of an earthquake-proof mount for a transmission /
FIG. 2 is a plan view of an earthquake-proof mount for a transmission / distribution system using the vibration-
3 is an example in which the earthquake-proof mount of the present invention is installed between a lower frame b1 of a switchboard B and a floor frame a1 of a concrete foundation A. Fig.
4 is a schematic view of a lower base steel plate according to an earthquake-proof mount for a transmission /
5 is a schematic view of an anti-vibration rubber pad according to an anti-vibration mount for a transmission /
6 is a schematic view of a coil spring portion according to an earthquake-proof mount for a transmission / distribution system using the vibration-
7 is a schematic view of an upper base steel plate according to an earthquake-proof mount for a transmission /
8 is a schematic view of a connecting bolt stopper according to an earthquake-proof mount for a transmission /

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In the following description, the term " earthquake-proof mount for use in a transmission / distribution system "according to the present invention is used because it is defined in consideration of the functions of the present invention and may vary depending on the intention or custom of the user, It should be understood that the present invention is not limited thereto.

BEST MODE FOR CARRYING OUT THE INVENTION A preferred embodiment of the "earthquake-resistant mount for use in a transmission / distribution system using a vibration-proof pad" according to the present invention will be described in detail below.

The following examples are merely illustrative of the present invention and are not intended to limit the scope of the present invention.

1 is an overall front view including a partial sectional view of an earthquake-proof mount for a transmission / distribution system using the vibration-damping pad of the present invention, FIG. 2 is an overall plan view of an earthquake- 4 is an explanatory view showing an example in which an earthquake-proof mount is provided between a lower frame b1 of a switchboard B and a floor frame a1 of a concrete foundation A. FIG. 4 is a perspective view of an earthquake- 5 is a schematic view of an anti-vibration rubber pad according to an anti-vibration mount for a transmission / distribution system using the anti-vibration pad of the present invention, FIG. 6 is a schematic view of a coil spring according to an anti- And FIG. 7 is a schematic view of an upper base steel plate according to an earthquake-proof mount for a transmission / distribution system using the vibration-proof pad of the present invention. A connecting bolt stopper according to the schematic diagram for the earthquake-resistant mounting switchboard.

As shown in Figs. 1 and 2, the earthquake-proof mount C of the present invention is installed at the corner between the lower frame b1 of the switchboard B and the bottom frame a1 of the concrete foundation A, In case of disaster or earthquake, it absorbs vibrations and shocks to ensure the security of the switchboard.

The earthquake-proof mount C is coupled to the bottom frame a1 to withstand an external force due to the self weight and seismic force of the switchboard B and to transmit the self weight and seismic force of the switchboard B to the bottom frame a1 A lower base steel plate part 1; A vibration damping rubber pad part 2 disposed on the lower base steel plate part 1 for reducing a vertical impact generated by vibration or seismic force to a vibration absorbing force to reduce an impact transmitted to the transmission / )Wow; And a shock absorbing member for absorbing a shock transmitted to the switchboard (B) by attenuating a vertical displacement generated by vibration or seismic force, such as the vibration-proof rubber pad unit (2) A coil spring part 3 for reducing the vibration and restoring the displacement and maintaining durability of the vibration proof rubber pad part 2; The upper portion of the lower frame b1 of the switchboard B and the upper portion of the lower portion of the lower frame b1 are formed on the upper portion of the vibration- proof rubber pad portion 2 and the coil spring portion 3, A base steel plate 4; The lower base steel plate portion 1 and the vibration proof rubber pad portion 2 and the upper base steel plate portion 3 are joined by joining the lower frame b1 of the switchboard B and the lower frame a1 of the concrete base A. [ Is composed of three to five connecting bolt stoppers (51) arranged vertically to prevent the escape of the earthquake-proof mount (C), to prevent the earthquake-resistant mount (C) And a connecting bolt stopper portion 5.

The earthquake-proof mount (C) of the present invention is provided with four earthquake mounts (C) at each corner in a general installation and operation panel, but one or six or eight earthquake mounts (C) may be installed at the center of the sides in a width or length-

The earthquake-proof mount C of the present invention is installed at the corner portion between the lower frame b1 of the switchboard B and the bottom frame a1 of the concrete foundation A by the connecting bolt stopper portion 5, The width of the vertical displacement can be adjusted by tightening and loosening the stopper nut portion 512 of the connection bolt stopper portion 5. If the stopper nut portion 512 is loosened too much, there is a problem that the switchgear B suffers a small impact, The vibration damping rubber pad portion 2 and the coil spring portion 3 can not attenuate the vibration due to impact or seismic force, so that the stopper nut portion 512 should be positioned at an appropriate height.

Further, the vibration-proof mount (C) of the present invention improves the durability of the vibration-proof rubber pad portion (2) for attenuating the seismic force by using the coil spring portion (3), and the vertical displacement and the turn- It is possible to secure the safety of the above-mentioned switchboard (B) mounted on the upper part by the internal force of the connection bolt stopper part (5), and the structure is simple and the production cost is low.

3, the earthquake-proof mount C is installed between the bottom frame a1 of the concrete foundation A and the lower frame b1 of the switchboard B, and the connection bolt stopper 5, The bottom frame a1 of the concrete foundation A and the bottom frame b1 of the switchboard B are coupled to each other while the vibration proof rubber pad portion 2 and the coil spring portion 3 perform vibration absorption and attenuation And the vertical displacement is restricted by the stopper nut portion 512 so that the vibration-proof rubber pad portion 2 is coupled with the stopper nut portion 512, So that the durability of the vibration-proof rubber pad portion 2 is maintained together with the coil spring portion 3 so as not to exceed the elasticity of the coil spring portion 3 and the durability of the vibration- Thereby preventing it from escaping.

As shown in FIG. 4, the lower base steel plate part 1 is coupled to the bottom frame a1 to withstand the external force due to the self weight and seismic force of the switchboard B, To the bottom frame a1.

The coil spring portion 3 is uniformly applied to the center portion of the lower base steel plate portion 1 so that the coil spring portion 3 is uniformly vibrated or seized by the coil spring portion 3 And a coil spring support base 11 having a constant height and a constant diameter are formed.

The coil spring part support 11 is welded to the bottom surface of the lower base steel plate part 1 so that the coil spring part 3 can receive a load or seismic force uniformly at the center, .

The lower base steel plate part 1 is provided with a bottom anti-vibration rubber pad separation preventing groove 12 having a predetermined depth so that the vibration proof rubber pad part 2 is not separated from a predetermined position, The same number of lower connection bolt stopper insertion holes 13 as the connection bolt stopper 51 to be inserted is formed.

The thickness of the lower base steel plate part 1 is preferably 10 mm or more, and the depth of the bottom anti-vibration rubber pad separation preventing groove 12 is preferably 5 mm or more.

형상으로 상기 수배전반(B)의 하부프레임(b1) 내측으로 들어가는 2변이 삼각형으로 커팅되는 것이 사용될 수 있다.The lower base steel plate part 1 can be used in various forms. In order to facilitate installation of the earthquake-proof mount C and to eliminate interference with the switchboard B,

It is possible to use a configuration in which the two sides that enter the inside of the lower frame b1 of the switchboard B are cut into triangular shapes.

As shown in FIG. 5, the anti-vibration rubber pad portion 2 is composed of a plurality of anti-vibration rubber pads 21 for dispersing seismic force and improving durability, and is installed on the upper portion of the lower base steel plate portion 1 And acts to attenuate the vertical displacement caused by the vibration or seismic force by the vibration absorbing force to reduce the shock transmitted to the transmission / reception panel (B) and restore the displacement.

The vibration damping rubber pad 21 is preferably a synthetic rubber made by emulsion polymerization of chloroprene, and is made of chloroprene rubber having weather resistance, ozone resistance, and bending resistance.

The vibration damping rubber pad 21 preferably has a tensile strength of 20 MPa or more, an elongation of 500% or more, a hardness of 60 Hs or more, and a permanent compression toughness of 35% [(100 ± 1) ° C., 22Hr) or less.

The vibration damping rubber pad 21 is provided with a coil spring part mounting hole 211 into which the coil spring part 3 is inserted and a plurality of pad connecting bolt stopper through holes 212 through which the connecting bolt stopper 51 passes, .

형상으로 상기 수배전반(B)의 하부프레임(b1) 내측으로 들어가는 2변이 삼각형으로 커팅되는 것을 사용할 수 있다.The anti-vibration rubber pads 21 may be of various types. In order to facilitate the installation of the anti-vibration mount C and to eliminate the interference with the switchboard B,

And the two sides that enter the inside of the lower frame b1 of the switchboard B are cut into triangles in the shape of a triangle.

As shown in FIG. 6, the coil spring portion 3 is provided at the center of the inner portion of the anti-vibration rubber pad portion 2 so that the vertical displacement generated by the vibration or seismic force, like the anti-vibration rubber pad portion 2, The elasticity of the spring reduces the shock transmitted to the switchboard B, restores the displacement, and maintains the durability of the anti-vibration rubber pad portion 2. [

The coil spring portion 3 is preferably a cylindrical compression spring type so as to uniformly receive a compression load due to the seismic force in the direction of the coil center line.

The repulsive force limit of the coil spring part 3 is limited to the height of the vibration proof rubber pad part 2 to maintain the durability of the vibration proof rubber pad part 2. [

That is, if the repulsive force of the coil spring part 3 is larger than the vibration-proof rubber pad part 2, the anti-vibration rubber pad part 2 can not perform vibration and damping, If the repulsive force of the coil spring part 3 is smaller than that of the anti-vibration rubber pad part 2, the durability of the anti-vibration rubber pad part 2 becomes a problem, and the performance of attenuation and vibration absorption as a whole is also deteriorated There is a problem.

7, the upper base steel plate portion 4 is formed on the upper portion of the anti-vibration rubber pad portion 2 and the coil spring portion 3, and the lower frame b1 of the switchboard B And transmits the external force received by the switchboard B to the lower portion.

The upper base steel plate 4 is provided with an upper vibration damping rubber pad separation preventing groove 41 for preventing the vibration damping rubber pad portion 2 from being separated from a predetermined position, An upper connecting bolt stopper through hole 42 of the same number as that of the stopper 51 is formed,

The thickness of the upper base steel plate 4 is preferably 10 mm or more, and the depth of the upper anti-vibration rubber pad separation preventing groove 41 is preferably 5 mm or more.

형상으로 상기 수배전반(B)의 하부프레임(b1) 내측으로 들어가는 2변이 삼각형으로 커팅되는 것이 사용될 수 있다.The upper base steel plate 4 can be formed in various forms. In order to facilitate installation of the earthquake-proof mount C and to eliminate interference with the switchboard B,

It is possible to use a configuration in which the two sides that enter the inside of the lower frame b1 of the switchboard B are cut into triangular shapes.

8, the connecting bolt stopper portion 5 connects the lower frame b1 of the switchboard B and the lower frame a1 of the concrete foundation A to form the lower base steel plate portion 1 The vibration proof rubber pad portion 2 and the upper base steel plate portion 3 are arranged vertically so as to be prevented from departing from each other and the conical moment received by the earthquake- And three to five connection bolt stoppers 51 for restricting vertical displacement.

The connection bolt stopper 51 includes a bolt head 5111 engaged with the lower base steel plate part 1 and a connection bolt part 511 formed of a bolt body 5112 connected to the bolt head 5111 and formed with a male screw, Wow; And a stopper nut 512 which is inserted into the connection bolt 511 to restrict vertical displacement of the earthquake-resistant mount C in an upward direction and is made of two or more stopper nuts 5121 so as not to be loosened by vibration .

The stopper nut 5121 is internally formed with a female screw for screw connection with the connecting bolt 511.

A male screw 51121 for screwing the stopper nut 5121 is formed at a predetermined upper portion of the bolt body 5112.

According to the vibration-proof mount (C) of the present invention, the durability of the vibration-proof rubber pad part (2) absorbing and attenuating the vibration due to the seismic force is improved by using the coil spring part (3) It is possible to secure the safety of the power transmission / distribution board B mounted on the upper portion by overcoming the proof load of the connection bolt stopper portion 5 and consequently the conduction moment due to the seismic force by the strength of the connection bolt stopper portion 5, Production cost is cheap.

A: Concrete foundation a1: Floor frame
a2: Anchor bolt
B: Switching panel b1: Lower frame
C: Seismic mount
1: Lower base steel plate part 11: Coil spring part support
12: lower anti-vibration rubber pad separation prevention groove 13: lower connection bolt stopper insertion hole
131: Bolt head inserting part 132: Bolt body passing hole
14: bottom surface coupling hole
2: anti-vibration rubber pad part 21: anti-vibration rubber pad
211: coil spring part mounting hole 212: pad connecting bolt stopper passing hole
3: coil spring portion
4: upper base steel plate portion 41: upper anti-vibration rubber pad separation preventing groove
42: upper connection bolt stopper passage hole
5: Connecting bolt stopper part 51: Connecting bolt stopper
511: Connecting bolt part 5111: Bolt head
5112: Bolt body 51121:
512: Stopper nut part 5121: Stopper nut

Claims (5)

(C) for absorbing vibrations and shocks to secure the safety of the power transmission and distribution panel in the event of a natural disaster or an earthquake is provided at the corner between the lower frame b1 of the switchboard B and the bottom frame a1 of the concrete foundation A. [ ),
The earthquake-proof mount C is coupled to the bottom frame a1 to withstand an external force due to the self weight and seismic force of the switchboard B and to transmit the self weight and seismic force of the switchboard B to the bottom frame a1 A lower base steel plate part 1;
A vibration damping rubber pad part 2 disposed on the lower base steel plate part 1 for reducing a vertical impact generated by vibration or seismic force to a vibration absorbing force to reduce an impact transmitted to the transmission / )Wow;
And a shock absorbing member for absorbing a shock transmitted to the switchboard (B) by attenuating a vertical displacement generated by vibration or seismic force, such as the vibration-proof rubber pad unit (2) A coil spring part 3 for reducing the vibration and restoring the displacement and maintaining durability of the vibration proof rubber pad part 2;
The upper portion of the lower frame b1 of the switchboard B and the upper portion of the lower portion of the lower frame b1 are formed on the upper portion of the vibration- proof rubber pad portion 2 and the coil spring portion 3, A base steel plate 4;
The lower base steel plate portion 1 and the vibration proof rubber pad portion 2 and the upper base steel plate portion 3 are joined by joining the lower frame b1 of the switchboard B and the lower frame a1 of the concrete base A. [ Is composed of three to five connecting bolt stoppers (51) arranged vertically to prevent the escape of the earthquake-proof mount (C), to prevent the earthquake-resistant mount (C) And a connecting bolt stopper portion 5,
The coil spring portion 3 is uniformly applied to the center portion of the lower base steel plate portion 1 so that the coil spring portion 3 is uniformly vibrated or seized by the coil spring portion 3 And a coil spring support base 11 having a predetermined height and a constant diameter are formed,
The lower base steel plate part 1 is provided with a bottom anti-vibration rubber pad separation preventing groove 12 having a predetermined depth so that the vibration proof rubber pad part 2 is not separated from a predetermined position, The same number of lower connection bolt stopper insertion holes 13 as the connection bolt stopper 51 to be inserted is formed,
The anti-vibration rubber pad part (2) is composed of a plurality of anti-vibration rubber pads (21) in order to disperse seismic force and improve durability,
The vibration damping rubber pad 21 preferably has a tensile strength of 20 MPa or more, an elongation of 500% or more, a hardness of 60 Hs or more, a compression set value of 35% [(100 ± 1)
The vibration damping rubber pad 21 is provided with a coil spring part mounting hole 211 into which the coil spring part 3 is inserted and a plurality of pad connecting bolt stopper through holes 212 through which the connecting bolt stopper 51 passes, Is formed,
The coil spring portion 3 is a cylindrical compression spring type so as to uniformly receive a compression load due to a seismic force in the direction of a coil center line,
The repulsive force limit of the coil spring part 3 is limited to the height of the vibration proof rubber pad part 2 to maintain the durability of the vibration proof rubber pad part 2,
The upper base steel plate 4 is provided with an upper vibration damping rubber pad separation preventing groove 41 for preventing the vibration damping rubber pad portion 2 from being separated from a predetermined position, An upper connecting bolt stopper through hole 42 of the same number as that of the stopper 51 is formed,
The connection bolt stopper 51 includes a bolt head 5111 engaged with the lower base steel plate part 1 and a connection bolt part 511 formed of a bolt body 5112 connected to the bolt head 5111 and formed with a male screw, Wow;
And a stopper nut portion 512 made of two or more stopper nuts 5121 inserted in the connecting bolt portion 511 to restrict the vertical displacement of the earthquake-resistant mount C in an upward direction and not to be released by vibration ,
The lower base steel plate part 1, the vibration proof rubber pad part 2 and the upper base steel plate part 4 are provided to facilitate installation of the earthquake-proof mount C and to eliminate interference with the switchboard B

The two sides that enter the inside of the lower frame b1 of the switchboard B are cut into a triangle,
The coil spring part support 11 is welded to the bottom surface of the lower base steel plate part 1 so that the coil spring part 3 can receive a load or seismic force uniformly at the center, Lt; / RTI &
The vibration damping rubber pad 21 is a synthetic rubber made by emulsion polymerization of chloroprene, is a chloroprene rubber material having weather resistance, ozone resistance and bending resistance,
The stopper nut 5121 is internally formed with a female screw for screw connection with the connecting bolt 511,
And a male screw (51121) for screw connection with the stopper nut (5121) is formed at a predetermined upper end portion of the bolt body (5112). The vibration-
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