JP6910058B2 - Seismic isolation device - Google Patents

Description

The present invention relates to a seismic isolation device that absorbs vibrations at the time of an earthquake, prevents furniture, shelves, and the like from collapsing and falling, and reduces property damage and human damage.

Japan is one of the most earthquake-prone areas in the world and has suffered enormous damage so far. Therefore, various measures have been taken so far. Seismic isolation devices are used as one of the earthquake countermeasures, and not only large structures such as buildings but also seismic isolation devices for furniture and water tanks are used.

Among the seismic isolation devices for small and lightweight devices, there is a device that suppresses vibration by rubber or a spring, and for example, there is a vibration insulation device disclosed in Patent Document 1. This vibration insulation device has a configuration in which a coil spring and a rubber spring around the coil spring are provided between the opposing plates, and a steel ball is provided in the coil spring.

JP-A-2010-255717

In such a vibration insulation device of Patent Document 1, when vibration is generated, the vibration is suppressed by a spring and rubber, and further, the steel ball in the coil spring moves due to the vibration accompanying the expansion and contraction, and the friction that repeats contact is caused. It is a device that suppresses vibration. Therefore, when vibrations occur continuously, the steel balls repeatedly come into contact with each other, so that an effect can be obtained, but in the case of short-term shaking (earthquake, etc.), a sufficient effect cannot be obtained. Moreover, when the coil spring moves from the place (origin) where it was first installed due to vibration, it is difficult to return to the origin.

The present invention has been made in view of the problems in the prior invention, and provides a seismic isolation device that softens the vibration at the time of an earthquake and facilitates the return to the origin.

In order to achieve the above object, the present invention comprises at least the following configurations or carries out procedures. In the following description, reference numerals and the like shown in the drawings may be added to facilitate understanding of the present invention, but each component of the present invention is limited to those shown in the drawings. It should be broadly interpreted to the extent that those skilled in the art can technically understand it.

The seismic isolation device according to one aspect of the present invention is a seismic isolation device interposed between the lower structure and the load, and the seismic isolation device has a small diameter portion between the upper foundation plate and the lower foundation plate. It is equipped with a conical spring with the upper and large diameter parts on the lower side and an elastic member, and the large diameter part of the conical spring is placed on the circular convex sara-shaped part of the lower foundation plate. It is characterized in that an elastic member is arranged around a conical spring.
With such a configuration, the seismic isolation device according to one aspect of the present invention softens the vibration at the time of an earthquake and facilitates the return to the origin.

Further, preferably, the end portion of the small diameter portion of the conical spring is fixed to the upper base plate.
With this configuration, even if the upper base plate deviates from the origin due to vibration, the upper base plate is pulled by the conical spring when the conical spring returns to the origin, and the upper base plate can return to the origin.

Further, preferably, the upper base plate is characterized by having a convex stopper extending downward at the end portion.
With this configuration, when the upper base plate and the lower base plate move relatively a certain distance in the horizontal direction in a state where the load is loaded, the stopper and the elastic member come into contact with each other. Therefore, it is possible to prevent the upper base plate from slipping off from the elastic member.

Further, preferably, the number of elastic members is three or more, and the elastic members are arranged at equal intervals around the origin of the conical spring.
With such a configuration, the upper base plate can be stably placed on the elastic member.

Further, preferably, the elastic member is provided with a protective cover at the upper end portion.
With such a configuration, the elastic member can be protected, and the upper base plate can be smoothly moved in the horizontal direction.

Further, preferably, the elastic member is characterized by having a columnar shape.
With such a configuration, when a vibration is generated and the elastic member is deformed, if there is a corner portion, the stress is concentrated on the corner portion. If it is columnar, it does not have corners, so stress concentration can be prevented and no burden is placed on a specific location.

Further, it is preferably provided with a connecting spring for connecting the upper base plate and the lower base plate.
With this configuration, the upper foundation plate and the lower foundation plate are connected by a connecting spring, so that when storing and transporting the seismic isolation device (when no luggage is loaded), the upper foundation plate and the lower foundation plate are separated. It is possible to prevent separation. In addition, since the connecting spring acts as a cushion, it is possible to soften the vibration.

Further, preferably, the upper base plate is provided with a recess having a through hole, a washer is provided in the recess, an elastic member is arranged below the through hole, and a connecting tool is passed through the through hole to provide a washer and an elastic member. It is characterized by connecting and.
With such a configuration, since the upper foundation plate is sandwiched between the washer and the elastic member fixed to the lower foundation plate, the upper foundation plate and the lower foundation plate are not separated, and the seismic isolation device can be integrated.

Further, preferably, it is a seismic isolation device interposed between the lower structure and the load, and the seismic isolation device is a unit having a seismic isolation function and a cushion between the upper foundation plate and the lower foundation plate. The unit is equipped with an elastic member between the upper plate and the lower plate, and a conical spring with the small diameter part on the upper side and the large diameter part on the lower side. The lower plate has a conical convex second sara-shaped part, the large diameter part of the conical spring is placed on the second sara-shaped part, the unit is sandwiched between cushioning materials, and the upper foundation. The plate and the lower foundation plate are characterized in that they are connected by a connecting elastic member.
With such a configuration, it is possible to soften the vibration at the time of an earthquake, facilitate the return to the origin, and withstand a relatively heavy load (large furniture, etc.).

Further, preferably, the cushion material is provided with a sliding plate on the surface in contact with the unit, and the sliding plate is characterized by having a circular convex portion.
With such a configuration, the friction between the unit and the cushion material is reduced, so that the units can move relatively horizontally with each other, and it becomes difficult to transmit a force in the horizontal direction when a vibration occurs.

As described above, according to the present invention, there is provided a seismic isolation device that softens the vibration at the time of an earthquake and facilitates the return to the origin.

It is a top view of the seismic isolation device which concerns on 1st Embodiment of this invention. It is a front sectional view of the seismic isolation device which concerns on 1st Embodiment of this invention. It is a top view which attached the connecting spring to the seismic isolation device which concerns on 1st Embodiment of this invention. It is a front sectional view which attached the connecting spring to the seismic isolation device which concerns on 1st Embodiment of this invention. It is a front sectional view of the seismic isolation device which concerns on 2nd Embodiment of this invention. It is a top view of the seismic isolation device which concerns on 3rd Embodiment of this invention. It is a front sectional view of the seismic isolation device which concerns on 3rd Embodiment of this invention.

Hereinafter, each embodiment of the present invention will be specifically described with reference to the drawings. It should be noted that the embodiments described below are merely examples of specific examples for carrying out the present invention, and do not limit the interpretation of the present invention.

<First Embodiment>
FIG. 1 is a plan view of the seismic isolation device 100 according to the first embodiment of the present invention, and FIG. 2 is a front sectional view of the seismic isolation device 100 according to the first embodiment of the present invention. The seismic isolation device 100 includes an upper foundation plate 101 for loading a load, a lower foundation plate 102 for placing on a floor surface, a table, or the like, a conical spring 104, and elasticity arranged around the conical spring 104. It is composed of a member 105. Further, the lower base plate 102 has a sara-shaped portion 103 having a circular convex shape near the center, and the conical spring 104 is placed on the sara-shaped portion 103. The seismic isolation device 100 is installed on a desk or table, and the load to be placed on the seismic isolation device 100 is, for example, a cupboard, a bookshelf, a water tank, a water tank shelf, or the like. The luggage is not drawn in the figure.

In the present embodiment, the shapes of the upper base plate 101 and the lower base plate 102 are circular, but a quadrangular shape, an elliptical shape, or any other appropriate shape can be selected depending on the shape of the load and the mode of use. Further, the shapes of the upper base plate 101 and the lower base plate 102 may be different.

An elastic member fixing tool 106 is installed on the lower base plate 102, and the elastic member 105 is fixed to the lower base plate 102 by the elastic member fixing tool 106. Since the elastic member 105 has a structure that can be removed from the elastic member fixture 106, it can be easily replaced when the elastic member 105 needs to be replaced due to aged deterioration or the like. As the material of the elastic member 105, a rubber material that is inexpensive, easy to process, easily deforms when a force is applied, and easily returns to its original state when the applied force disappears is preferable. Further, a highly durable metal spring, composite resin, or the like may be used.

The elastic member 105 and the elastic member fixture 106 are attached at a total of 6 locations at equal intervals around the origin O, that is, at intervals of about 60 °. By arranging them at equal intervals in this way, it is possible to stably suppress the vibration in the horizontal direction when a vibration occurs, regardless of the direction in which the force is applied.

In order to stably support the upper base plate 101, at least three elastic members 105 may be used. Further, as the number of elastic members 105 installed and the installation area increase, the seismic isolation capacity also improves. Therefore, it is preferable to install many elastic members 105 when cost reduction, weight reduction, and miniaturization are not required.

When the number of elastic members 105 installed increases or decreases, the number of elastic member fixtures 106 also increases or decreases, and the attachment interval also changes. For example, when 12 elastic members 105 are installed, the elastic member fixtures 106 are attached at intervals of about 30 °.

Further, the shape of the elastic member 105 is preferably a cylinder. This is because when a vibration occurs and the elastic member 105 is deformed, if there is a corner part, stress concentrates on the corner part, but if it is columnar, it does not have a corner part, so stress concentration can be prevented and specified. This is because there is no burden on the part. However, in order to effectively utilize the space, the elastic member 105 may have an elliptical shape, a fan shape, a rectangular shape, or the like.

Further, a protective cover 107 is attached to the upper end of the elastic member 105 in order to protect the elastic member 105. The protective cover 107 and the upper base plate 101 are not fixed. Therefore, even if a vibration occurs, the lower base plate 102 sways, and the elastic member 105 and the protective cover 107 fixed thereto sway, the protective cover 107 and the upper base plate 101 rub against each other and slip. The shaking is less likely to be transmitted to the upper base plate 101. Therefore, the protective cover 107 is preferably made of a member having a low coefficient of friction, for example, a resin or a metal.

Since the edge of the upper base plate 101 has a convex stopper 108 extending downward, it is assumed that a vibration occurs and the protective cover 107 and the upper base plate 101 slide with each other and move in the horizontal direction. However, since the protective cover 107 and the elastic member 105 come into contact with the stopper 108, they cannot move further in that direction. Therefore, the upper base plate 101 does not slide down from the protective cover 107. Then, after the contact, it returns to the origin O direction.

The lower base plate 102 has a smooth portion 103 that is a circular convex portion near the center. A conical spring 104 is placed on the flat portion 103. The size of the flattened portion 103 matches the large-diameter inner dimension of the conical spring 104, and is shaped to fit into the flattened portion 103. Therefore, the conical spring 104 is less likely to deviate from the origin. However, for example, a gap of 5 mm or less may be provided between the large-diameter inner dimension of the conical spring 104 and the smooth portion 103. By providing the gap, the conical spring 104 moves even with a relatively light vibration. At this time, the seismic isolation effect can be expected because the vibration in the horizontal direction can be suppressed by the frictional force that the conical spring 104 and the smooth portion 103 rub against each other and move.

Further, when a vibration occurs and a certain force or more is applied, the conical spring 104 rides on the smooth portion 103. At that time, if the diameters of the sara-shaped portion 103 and the conical spring 104 are small, the conical spring 104 gets over the sara-shaped portion 103 and cannot return to the origin O. Larger is better. However, if the diameters of the flat portion 103 and the conical spring 104 are made too large, there will be no space for installing the elastic member 105, so the selection may be made according to the situation. In the present embodiment, the ratio of the diameters of the lower base plate 102 and the conical spring 104 is about 2: 1, but the ratio is not limited to this.

The large-diameter end of the conical spring 104 is held by the conical spring holding portion 109. The conical spring holding portion 109 has a hole, and a large-diameter end portion of the conical spring 104 is inserted into the hole. The large diameter end inserted into the hole is not in a fixed state. Since it is pierced (with a gap / margin) so that it will not come off, the large-diameter end of the conical spring 104 is less likely to be deformed without applying excessive force when a vibration occurs. .. Further, since the large-diameter end portion of the conical spring 104 is held, the conical spring 104 is less likely to deviate from the origin O.

The small-diameter end of the conical spring 104 is welded and fixed near the center of the upper base plate 101. Therefore, when a vibration occurs and the upper base plate 101 moves in the horizontal direction, the conical spring 104 is also pulled and moved. At that time, when a certain force or more is applied in the horizontal direction, the conical spring 104 moves so as to ride on the smooth portion 103.

Attenuation effect due to energy when the conical spring 104 rides on the smooth portion 103 and when it returns to the original position after riding (change in potential energy of the conical spring 104 and friction between the conical spring 104 and the flat portion 103). Occurs. Further, when the conical spring 104 rides on, the conical spring is crushed in the vertical direction of 104, so that the vibration in the vertical direction can be softened.

Then, the conical spring 104 that rides on the smooth portion 103 during the vibration returns to the origin O in the form of being fitted into the smooth portion 103 by its own weight after the vibration is stopped. At that time, since the small-diameter end of the conical spring 104 is welded and fixed near the center of the upper base plate 101, even if the upper base plate 101 deviates from the origin O, it is pulled by the conical spring 104 and the upper part is pulled. The base plate 101 tries to return to the origin O.

As described above, according to the seismic isolation device 100 according to the first embodiment of the present invention, it is possible to soften the vibration at the time of an earthquake and easily return to the origin O.

Next, the seismic isolation device 100 to which a spring (connecting spring 110) for connecting the upper base plate 101 and the lower base plate 102 of the seismic isolation device 100 according to the first embodiment is attached will be described with reference to FIGS. 3 and 4. ..

FIG. 3 is a plan view in which the connecting spring 110 is attached to the seismic isolation device 100, and FIG. 4 is a front sectional view in which the connecting spring 110 is attached to the seismic isolation device 100. One end of the connecting spring 110 is attached to the stopper 108 of the seismic isolation device 100 by a screw. Further, the other end portion, which is the tip end side opposite to the one end portion, is inserted into the through hole 112 provided in the lower base plate 102. The through hole 112 is provided in the upper protrusion 111 extending upward from the edge of the lower base plate 102. In this way, one end of the connecting spring 110 is attached with a screw, and the other end is inserted into the through hole 112 provided in the lower base plate 102 to connect the upper base plate 101 and the lower base plate 102. It is connected. Since the upper foundation plate 101 and the lower foundation plate 102 are connected by the connecting spring 110, the upper foundation plate 101 and the lower foundation plate 102 are used when storing and transporting the seismic isolation device 100 (when no load is loaded). It can be prevented from separating with. Since the other end of the connecting spring 110 is simply inserted into the through hole 112 of the upper protrusion 111, the other end has a structure that can be easily pulled out by hand.

The connecting spring 110 is attached in a direction of expansion and contraction in the horizontal direction. Therefore, when the upper base plate 101 and the lower base plate 102 move relatively due to the vibration, the connecting spring 110 acts as a cushion, so that the vibration can be softened. The connecting springs 110 are attached at six locations around the origin O at equal intervals, that is, at intervals of about 60 °. By arranging them at equal intervals in this way, when a vibration occurs, the vibration can be stably suppressed in the horizontal direction regardless of the direction in which the force is applied. In addition, in order to stably suppress the vibration from any direction, at least three connecting springs 110 may be attached at equal intervals.

Further, the connecting spring 110 is installed at a position where it does not interfere with the elastic member 105 (it does not come into contact with each other). This is because when the other end of the connecting spring 110 is inserted into the through hole 112, if the other end of the connecting spring 110 comes into contact with the elastic member 105, the elastic member 105 may be damaged. It is preferable to attach the connecting spring 110 in a well-balanced manner near the center of the interval at which the elastic member 105 is arranged because the vibration can be stably suppressed regardless of the direction in which the force is applied.

As described above, if the connecting spring 110 is attached, it is possible to prevent the upper base plate 101 and the lower base plate 102 from being separated when the seismic isolation device 100 is stored and transported (when no load is loaded). Can be done. Further, since the connecting spring 110 acts as a cushion, the vibration can be further softened.

Although it is described for desktop use in this embodiment, it is not always necessary to install it on a desk or the like, and it may be used by directly placing it on the floor.

<Second embodiment>
Next, the seismic isolation device 200 according to the second embodiment will be described with reference to FIG. In this embodiment, a configuration different from the first embodiment of the present invention will be mainly described. Regarding FIG. 5, detailed description will be omitted by assigning the same reference numerals to the same configurations as those described in FIGS. 1 and 2.

The seismic isolation device 200 according to the second embodiment includes an upper base plate 201 for loading a load, a washer 202, a connector 205, a lower base plate 102 for placing on a floor surface, a table, or the like. It is composed of a conical spring 104 and an elastic member 105 arranged around the conical spring 104. The lower base plate 102 has a sara-shaped portion 103 having a circular convex shape near the center, and the conical spring 104 is placed on the sara-shaped portion 103.

The upper base plate 201 has a recess 204 having a through hole 203, and a washer 202 having a hole near the center is provided therein. An elastic member 105 with a protective cover 107 is arranged below the through hole 203. A nut 206 is attached to the protective cover 107. Then, the connecting tool 205 passes through the through hole 203, the hole of the washer 202, and the nut 206 to connect each of them. The connector 205 is preferably a screw, a bolt, or the like whose tightening strength can be freely changed. The tip of the connector 205 may reach the elastic member 105 in order to prevent the connector 205 from coming off.

The upper base plate 201 is sandwiched between the washer 202 and the protective cover 107 fixed to the elastic member 105 by the connector 205. Therefore, even if a strong vibration occurs and the seismic isolation device 200 and the mounting object are momentarily lifted, the upper foundation plate 201 and the lower foundation plate 102 will not come off.

Further, when a vibration occurs and the upper base plate 201 and the lower base plate 102 move relatively in the horizontal direction, the upper base plate 201, the protective cover 107, and the washer 202 rub against each other and slide with each other. Even if the 102 sways in the horizontal direction, the sway is less likely to be transmitted to the upper base plate 201.

As described above, according to the seismic isolation device 200 according to the second embodiment of the present invention, the upper base plate 201 and the lower base plate 102 are separated by the connector 205 even when a strong vibration occurs. It is possible to soften the vibration at the time of an earthquake and facilitate the return to the origin while preventing the problem.

Regarding the seismic isolation device 200 according to the second embodiment, the upper foundation plate 201 and the lower foundation plate 102 may be connected by a connecting spring 110. In that case, since the connecting spring 110 acts as a cushion, the vibration can be further softened.

<Third embodiment>
Next, the seismic isolation device 300 according to the third embodiment will be described with reference to FIGS. 6 and 7. In this embodiment, a configuration different from the first embodiment of the present invention will be mainly described. Regarding FIGS. 6 and 7, the same configurations as those described in FIGS. 1 and 2 are designated by the same reference numerals, and detailed description thereof will be omitted.

The seismic isolation device 300 according to the third embodiment includes a unit 310 having a seismic isolation function and a cushion material 303 between the upper foundation plate 301 and the lower foundation plate 302, and carries a load. The upper base plate 301 for the purpose and the lower base plate 302 are connected by a connecting elastic member 304. The structure of the unit 310 having a seismic isolation function includes an elastic member 105 and a conical spring 104 between the upper plate 311 and the lower plate 312. It has a second sara-shaped portion 314, and a large-diameter portion of the conical spring 104 is placed on the second sara-shaped portion 314. Further, the seismic isolation device 300 according to the third embodiment is premised on mounting furniture such as a large bookshelf and a chest of drawers and a large water tank.

The unit 310 having a seismic isolation function has a structure similar to that of the seismic isolation device 100 according to the first embodiment. The point is that it has 313.

The end of the connecting elastic member 304 is connected to the upper base plate 301, and the other end is connected to the lower base plate 302 by screws or bolts. Further, since the cushion material 303 and the unit 310 are sandwiched between the upper base plate 301 and the lower base plate 302, it is prevented that the members are separated from each other. As a result, the seismic isolation device 300 becomes more durable.

In other words, it can withstand a relatively heavy load. It also plays a role in preventing the seismic isolation device 300 from being destroyed by the large energy that a relatively heavy object moves when a vibration occurs. Therefore, the connecting elastic member 304 is preferably a combination of a metal coil spring and a bow spring having relatively high strength.

However, when it is desired to reduce the weight of the seismic isolation device 300, the material of the connecting elastic member 304 may be made of a lightweight composite resin, rubber, or the like. In addition, a metal member, a composite resin, rubber, or the like may be combined depending on the usage conditions.

A unit 310 having a seismic isolation function and a cushion material 303 are alternately overlapped between the upper foundation plate 301 and the lower foundation plate 302. Since the cushion material 303 is fixed to the upper base plate 301 and the lower base plate 302, the uppermost and lowermost stages are the cushion material 303. Therefore, the number of cushioning materials 303 sandwiched between the upper base plate 301 and the lower base plate 302 needs to be two or more, and the number of units 310 needs to be one or more. The more the unit 310 and the cushion material 303 are laminated, the higher the seismic isolation effect. However, since the seismic isolation device 300 becomes more compact as the number of units 310 and cushion material 303 decreases, the number of units 310 and cushion material may be selected as necessary.

Further, the cushion material 303 is inexpensive and easy to process, is easily deformed when a force is applied, and is preferably a rubber material that easily returns to its original state when the applied force is removed. It may be a composite material having various functions.

A sliding plate 305 is attached to the surface of the cushion material 303 in contact with the unit 310. As a result, when a vibration occurs, the cushion material 303 and the unit 310 can easily move to each other in the horizontal direction. Therefore, the sliding plate 305 is preferably made of resin or metal having a low coefficient of friction.

Further, there are two types of the sliding plate 305: the sliding plate 305a attached to the upper surface of the cushion material and the sliding plate 305b attached to the lower surface of the cushion material. The sliding plate 305a has a conical convex portion 306 that fits into the second flat portion 314, and the sliding plate 305b has a conical concave portion 307 that fits into the first smooth portion 313. ing.

The convex portion 306 and the second smooth portion 314 and the concave portion 307 and the first smooth portion 313 are fitted, but there is a gap 308. Therefore, when a force is applied in the horizontal direction, the force slides in the horizontal direction by the amount of this gap, so that the force is less likely to be transmitted and vibration can be suppressed. The range of the gap 308 is preferably 5 mm to 15 mm, which is a distance that makes it easy to return to the origin O after the vibration.

As described above, according to the seismic isolation device 300 according to the third embodiment of the present invention, when the vibration at the time of an earthquake is softened, the origin O can be easily returned, and heavy furniture or the like is placed. In addition, even if a strong vibration occurs, it is possible to prevent each member from falling apart. Further, although it has been described that large furniture or the like is placed in the present embodiment, it may be operated not only in large furniture or a water tank but also in an assembly house or a prefabricated hut.

Until now, the seismic isolation device of the present invention has been premised on being used for furniture such as tabletop shelves and water tanks, and large furniture and water tanks, but the present invention is not limited to this and is expensive. , It is effective to use it in the medical field where medical equipment (medicine, medicine shelf, life support system, etc.) that is directly related to life is used. This is because when a tremor occurs, it is possible to prevent the shelves on which chemicals are placed from tipping over and reduce the risk that the pipe connecting the medical device (life support system, etc.) and the patient will come off.

The seismic isolation device according to the present invention is useful for preventing the collapse and overturning of medical equipment, furniture, aquariums, etc. in the event of an earthquake, preventing secondary disasters, and reducing physical damage and human damage. ..

100 Seismic isolation device 101 Upper foundation plate 102 Lower foundation plate 103 Sara-shaped part 104 Conical spring 105 Elastic member 106 Elastic member fixture 107 Protective cover 108 Stopper 109 Conical spring holding part 110 Connecting spring 111 Upper protrusion 112 Through hole 200 Seismic isolation Device 201 Upper foundation plate 202 Washer 203 Through hole 204 Recession 205 Connector 206 Nut 300 Seismic isolation device 301 Upper foundation plate 302 Lower foundation plate 303 Cushion material 304 Connecting elastic member 305 Sliding plate 305a Sliding plate 305b Sliding plate 306 Convex part 307 Concave part 308 Gap 310 Unit 311 Upper plate 312 Lower plate 313 1st sara-shaped part 314 2nd sara-shaped part O Origin

Claims (2)

It is a seismic isolation device interposed between the lower structure and the loaded luggage, and the seismic isolation device includes a unit having a seismic isolation function and a cushioning material between the upper foundation plate and the lower foundation plate. The unit is provided with an elastic member between the upper plate and the lower plate, and a conical spring having a small diameter portion on the upper side and a large diameter portion on the lower side. The lower plate has a conical convex second salar-shaped portion, a large-diameter portion of the conical spring is placed on the second saloon-shaped portion, and the unit is sandwiched between the cushioning materials. , A seismic isolation device characterized in that the upper foundation plate and the lower foundation plate are connected by a connecting elastic member. The seismic isolation device according to claim 1 , wherein the cushion material includes a sliding plate on a surface in contact with the unit, and the sliding plate has a circular convex portion.

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