JP2012047241A - Seismic isolation device, and electric wiring unit using the seismic isolation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a seismic isolation device which can quickly respond to vibration force occurring at an earthquake and act on equipment attached to a building to absorb a shake of the equipment.SOLUTION: The seismic isolation device 1 includes straight rails 6, 7 crossing each other at right angles, a pair of sliders 8, 9, and a connecting member 10 to connect the sliders 8 and 9, and is used by fixing a pair of steel plates 2, 3 to the building and the equipment. Grooves for rolling having a semicircular cross section in which a plurality of steel balls are set and roll, are formed on an inner surface of the leg 22 of the sliders straddling the rails 6, 7 and on both sides of the rails 6, 7 facing the inner surface. Through passages parallel to the grooves for rolling are formed between both ends of the grooves in the sliders 8, 9, wherein end plates for guiding the steel balls rolling in the grooves to the through passages are set at both ends of the grooves in the sliders 8, 9. Coil springs 11, 12 are set between the connecting member 10 and a pair of steel plates 2, 3 in four directions along the rails.

Description

  The present invention relates to a seismic isolation device, and more particularly to a seismic isolation device that prevents equipment installed in a building from being damaged by an earthquake.

  The seismic isolation device prevents damage to the building by absorbing the shaking of the earthquake and suppressing the seismic force acting on the building. On the other hand, the earthquake-resistant structure for earthquake countermeasures for buildings is to prevent the damage by increasing the strength of the building so that it can sufficiently withstand the exciting force acting on the building. By the way, when a building has a seismic structure, a seismic force acts on the equipment attached to the building when an earthquake occurs. As a result, the equipment may swing like a pendulum with respect to the building, a force greater than the allowable force may be applied to the mounting portion, the mounting portion may be damaged, and the equipment may fall or fall and be damaged. Such equipment includes lighting fixtures, chandeliers, surveillance cameras, cable racks for electrical wiring, and the like.

  In order to prevent such damage to equipment, Patent Document 1 proposes to suspend a chandelier from the ceiling via a seismic isolation device so that the shaking of the earthquake is not transmitted to the chandelier. In other words, the seismic isolation device described in the same document is provided with a pair of flat support members arranged opposite to each other, and supported by opposing surfaces of the pair of support members, with a space therebetween and orthogonal to each other. And a pair of sliders that run along the rails and a connecting member that connects these sliders to each other, and one supporting member is a building. The chandelier is suspended from the other support member and used.

  According to this, the support member in which the chandelier is suspended by the shaking of the earthquake and the support member fixed to the ceiling portion are relatively freely displaced by the slider traveling on the orthogonal rail. As a result, since the shaking of the building is not applied to the chandelier, the chandelier can be prevented from falling and being damaged.

JP 2008-164049 A

  However, in the suspended object seismic isolation device of Patent Document 1, since the slider is configured to slide on the rail and travel, the slider starts traveling with a delay when an earthquake occurs. There is a case where the shaking force is transmitted to the installed equipment because of the earthquake force. In other words, the sliding frictional force between the rail and the slider is large until it moves from the stationary state to the moving state, so that the seismic force at the time of the earthquake is greatly transmitted to the equipment.

  The problem to be solved by the present invention is to realize a seismic isolation device capable of quickly responding to the seismic force at the time of an earthquake acting on equipment installed in a building and absorbing the shaking of equipment. It is in.

  In order to solve the above-described problems, the present invention is provided by a pair of flat support members arranged opposite to each other and opposed surfaces of the pair of support members, with a space therebetween and orthogonal to each other. A straight rail, a pair of sliders having leg portions straddling these rails and traveling along the rails, and a connecting member for connecting the sliders to each other, and the pair of support members are attached to the building and the building. In a seismic isolation device that is fixed to each equipment, the rolling groove with a semicircular cross section in which steel balls roll on the inner surface of the leg of the slider straddling the rail and on both sides of the rail facing the inner surface A plurality of steel balls are mounted in the rolling groove, and through holes parallel to the rolling groove are formed at both ends in the slider, and the rolling groove is rolled at both ends of the rolling groove of the slider. A guide member is provided to guide the incoming steel ball to the through hole. It is to become, between the connecting member and one of the support members, each coil spring in four directions along the rail, characterized by comprising stretched.

  According to the present invention, since the steel ball rolls on the rolling groove formed in the rail and the slider and the slider travels along the rail, the difference between the static friction and the dynamic friction is small. Accordingly, the slider moves smoothly, and the earthquake can be absorbed by the free relative displacement of the pair of support members. As a result, damage to equipment can be prevented.

  In addition, the present invention has a rail-shaped semicircular arc rolling groove on which the steel ball rolls on the inner surface of the slider leg straddling the rail and on both side surfaces of the rail facing the inner surface. And the slider are engaged with each other through rolling grooves via a plurality of steel balls. As a result, it is possible to withstand a pulling force in a direction in which the sliders are separated from each other between the pair of sliders and the rails connected by the connecting member, so that equipment with a certain load can be suspended and used. That is, when the equipment is suspended from the ceiling of the building, one supporting member can be fixed to the ceiling and the equipment can be suspended from the other supporting member.

  By the way, when the seismic force in the extending direction of the rail provided on the support member acts on the support member fixed to the ceiling portion, the slider meshing with the rail provided on the support member becomes the other support member. According to the load of the equipment hung on, it is displaced in the direction opposite to the direction of the seismic force. When the slider is displaced to the end of the rail and stops, the equipment is greatly shaken by the inertial force, and the seismic force acts on the equipment. In order to prevent such a phenomenon, in the present invention, a spring is stretched between a connecting member that connects the pair of sliders to each other and a supporting member. Thereby, the seismic force which acts on equipment can be relieved. Furthermore, the spring acts as a restoring force that returns the equipment to its original position when the earthquake shake changes in the opposite direction.

  When the load on the equipment increases, the displacement of the slider on the rail relatively increases in order to absorb the seismic force. Therefore, the length of the rail must be changed according to the load on the equipment. The seismic device becomes larger. Therefore, if the number of coil springs and the spring constant are changed according to the load of the equipment, the seismic force can be absorbed by a certain displacement on the rail even if the load of the equipment is increased. Without changing the size of the seismic isolation device, it can be applied to various equipment with different loads.

  Moreover, as one aspect using the seismic isolation device of the present invention, a suspension member fixed to the ceiling of the building, a cable rack supported by the ceiling via the suspension member, and fixed to the floor of the building In the electrical wiring facility in which the electrical board and the cable laid on the cable rack are drawn from the top of the electrical board and connected to the terminals provided in the electrical board, the suspension member is an exemption of the present invention. It can be used by being fixed to the ceiling via a seismic device. Thereby, the seismic force which acts on a cable rack can be suppressed, and it can suppress that a cable rack shakes like a pendulum. As a result, the vibration of the cable rack can be suppressed relatively small with respect to the electric panel, and the terminal is provided with damage to the terminal by suppressing the vibration force from acting on the terminal provided in the electric panel. Electric accidents can be prevented.

  Furthermore, as another aspect using the seismic isolation device of the present invention, an electrical panel fixed to a building built on the ground via the seismic isolation device, and a cable embedded in the ground In an electrical wiring facility having a cable riser that rises in a space provided below and is pulled into the electrical board, the cable part that extends in the lateral direction of the cable riser is installed on the ground. The cable rack is installed on a cable rack placed on the seismic isolation device of the present invention, the cable rack is formed by spanning a plurality of crosspiece members over two frame members, and the crosspiece member is framed via roller bearings. It can be used attached to. Thereby, the displacement amount of the shaking direction of the cable rising portion can be reduced with respect to the displacement amount of the ground due to the earthquake. As a result, it is possible to suppress the seismic force acting on the connection portion between the cable rising portion and the cable portion extending in the lateral direction.

  ADVANTAGE OF THE INVENTION According to this invention, it responds rapidly to the seismic force at the time of the earthquake occurrence which acts on the equipment installed in a building, and can absorb the shake of equipment.

It is a top view of the seismic isolation apparatus of one Embodiment of this invention. It is sectional drawing in line AA of FIG. It is sectional drawing in line BB of FIG. It is sectional drawing showing the structure of the rail and slider of the seismic isolation apparatus of FIG. FIG. 2 is a perspective view showing a partially broken structure of a rail and a slider in the seismic isolation device of FIG. 1. It is a schematic diagram showing the related operation | movement with the connection member and coil spring of the seismic isolation apparatus of FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is a conceptual block diagram of the electrical wiring installation which used the seismic isolation apparatus of one Embodiment of this invention for the cable rack attached to a ceiling part. It is a conceptual block diagram which used the seismic isolation apparatus of one Embodiment of this invention for the lighting fixture attached to a ceiling part. It is a conceptual block diagram which used the seismic isolation apparatus of one Embodiment of this invention for the chandelier attached to a ceiling part. It is a top view of the seismic isolation apparatus of other embodiment of this invention. It is a conceptual block diagram of the electrical wiring installation used for the cable rack which installs the seismic isolation apparatus of FIG. 10 on the ground.

Hereinafter, an embodiment of a seismic isolation device to which the present invention is applied will be described.
(Embodiment 1)
FIG. 1: has shown the top view of the seismic isolation apparatus of one Embodiment of this invention. 2 shows a cross-sectional view taken along line AA in FIG. 1, and FIG. 3 shows a cross-sectional view taken along line BB in FIG. The seismic isolation device 1 includes a pair of flat steel plates 2 and 3 formed in a rectangular shape. A flat spring fixing plate 4 is attached to the steel plate 2 through a reinforcing member 15 so as to protrude from the center of both side edges in the longitudinal direction. Similarly, a flat plate-like spring fixing plate 5 is attached to the steel plate 3 through the reinforcing member 15 so as to protrude from the center of both side edges in the longitudinal direction. In addition, the steel plates 2 and 3 are provided with straight rails 6 and 7, respectively, with a space between each other and the longitudinal directions orthogonal to each other. Sliders 8 and 9 are provided along the rails 6 and 7 so as to be able to travel. The sliders 8 and 9 are connected to each other by a connecting member 10. Between the connecting member 10 and the spring fixing plate 5, a coil spring 11 having one end fixed to the connecting member 10 and the other end fixed to a bolt 16 attached to the spring fixing plate 5 is stretched. Similarly, a coil spring 12 having one end fixed to the connecting member 10 and the other end fixed to a bolt 16 attached to the spring fixing plate 4 is stretched between the connecting member 10 and the spring fixing plate 4.

  With reference to FIG.4 and FIG.5, the related structure of the rails 6 and 7 and the sliders 8 and 9 is demonstrated. However, since the rail 6 and the slider 8 have the same related configuration as the rail 7 and the slider 9, only the related configuration of the rail 7 and the slider 9 will be described.

  The slider 9 has a leg portion 22 that straddles the rail 7, and a cross section that runs along the rail 7 has a U-shaped shape. A rolling groove 19 a having a semicircular cross section in which a plurality of steel balls 18 roll is formed on both side surfaces of the rail 7. In addition, a rolling groove 20 a having a circular arc shape in which the steel ball 18 rolls is formed at the top corner of the rail 7.

  On the inner surface of the leg portion of the slider 9, a rolling groove 19b having a semicircular cross section in which the steel ball 18 rolls is formed at a position facing the rolling groove 19a. Thereby, the rail 7 and the slider 9 have the structure which meshes | engages via the steel ball 18 by the rolling groove | channel 19ab. Further, a rolling groove 20b having an arcuate cross section in which the steel ball 18 rolls is formed at a corner portion of the U-shaped inner surface of the slider 9 at a position facing the rolling groove 20a.

  In the leg portion of the slider 9, a through path 23 parallel to the rolling groove 19 ab is formed across both ends. A through passage 24 parallel to the rolling groove 20ab is formed at both ends inside the portion of the slider 9 straddling the rail 7. At both ends of the rolling grooves 19ab and 20ab, end plates 25 for attaching the steel balls 18 rolling in the rolling grooves 19ab to the through passages 23 and 24, respectively, are attached with bolts 26. Although not shown, each end plate 25 is provided with a guide path connecting the rolling groove 19ab and the through path 23 and the rolling groove 20ab and the through path 24. A circulation path for circulating the steel ball 18 is formed by the rolling groove 19ab, the through path 23, and the guide path or the rolling groove 20ab, the through path 24, and the guide path. A plurality of steel balls 18 attached to the retainer 27 are attached to the circulation path. Rubber stoppers 21 are respectively installed at the ends of the rails 7.

  Next, the operation of the seismic isolation device 1 will be described with reference to FIG. 6 by taking as an example the case where equipment is suspended from the ceiling of the building via the seismic isolation device 1. In the seismic isolation device 1, three coil springs 11 are stretched between the connecting member 10 and the spring fixing plate 5, and three coil springs 12 are provided between the connecting member 10 and the spring fixing plate 4. Each book is stretched. However, since FIG. 6 is a schematic diagram showing the related operation between the connecting member 10 and the coil springs 11 and 12, the coil springs 11 and 12 are each stretched one by one.

  The steel plate 2 is fixed to the ceiling of the building with bolts passed through the bolt holes 13, and the equipment is fixed with the bolts passed through the bolt holes 14 to the steel plate 3 and suspended. The longitudinal direction of the steel plate 3 is the x direction, the longitudinal direction of the steel plate 2 is the y direction, and the rail 7 and the rail 6 are installed along the x axis and the y axis, respectively. It is assumed that the seismic force is applied to the seismic isolation device 1 installed in this manner from the ceiling to the steel plate 2 in a direction that forms an angle of 45 degrees with respect to the positive directions of the x axis and the y axis, for example. At this time, the connecting member 10 travels relatively on the rail 7 in the positive direction of the x axis and travels relatively on the rail 6 in the negative direction of the y axis. Thereby, although the steel plate 2 moves in the direction of the seismic force, the equipment fixed to the steel plate 3 moves in a direction opposite to the direction of the seismic force. Similarly, regardless of which direction of 360 ° in the xy plane the seismic force acts on the steel plate 2, the equipment moves in a direction opposite to the direction of the seismic force. Therefore, even if an excitation force in any direction in the xy plane acts on the building, the excitation force can be absorbed by the free relative displacement of the steel plates 2 and 3, and the equipment can be prevented from shaking. As a result, damage to equipment can be prevented.

  As shown in FIG. 6B, when the connecting member 10 travels on the rail 6, the coil spring 12 is extended. Similarly, when the connecting member 10 travels on the rail 7, the coil spring 11 is extended. And when the shaking of an earthquake changes to a reverse direction, the relative position of the steel plate 2 and the steel plate 3 can be returned by the restoring force of the coil springs 11 and 12. FIG.

  With reference to FIGS. 4 and 5, related operations between the sliders 8 and 9 and the rails 6 and 7 will be described. However, since the related operations between the sliders 8 and 9 and the rails 6 and 7 are respectively the same related operations, only the related operations between the slider 9 and the rails 7 will be described.

  When the slider 9 travels along the rail 7, the steel ball 18 rolls on the rolling grooves 19 ab and 20 ab between the rail 7 and the slider 9 from one end to the other end in the moving direction of the slider 9. When the steel ball 18 reaches the other end, it is guided from the guide path of the end plate 25 to the through paths 23, 24, and from the through paths 23, 24 through the guide path of the end plate 25 at one end, the rolling grooves 19ab, 20ab. Returned to

  When the sliders 8 and 9 start to travel along the rails 6 and 7, the steel ball 18 rolls on the rolling grooves 19ab and 20ab, so that the difference between static friction and dynamic friction is small. Therefore, the sliders 8 and 9 can quickly respond to an earthquake and begin to move smoothly, and since the seismic force does not act on the equipment, the equipment can be prevented from shaking.

  Since the slider 9 and the rail 7 are engaged with each other by the rolling groove 19ab via the steel ball 18, the slider 9 and the rail 7 can withstand a tensile force in a direction in which the slider 9 and the rail 7 are separated from each other. The device can be used by hanging. That is, when the equipment is suspended from the ceiling of the building, the steel plate 2 can be fixed to the ceiling and the equipment can be suspended from the steel plate 3.

  The retainer 27 eliminates the mutual friction between the steel balls 18, eliminates the collision sound, and allows the steel balls 18 to be uniformly aligned and circulated. Further, the rolling resistance fluctuation is small and a smooth movement can be obtained, and the steel ball 18 can be prevented from falling off when the sliders 8 and 9 are pulled out from the rails 6 and 7.

  In the present embodiment, three coil springs 11 and 12 are respectively stretched between the connecting member 10 and the spring fixing plates 5 and 6, but the number of coil springs and springs from one to three in each place. Can be installed with different constants. Thereby, the number of coil springs and a spring constant according to the load of the equipment to be hung can be set. As a result, even if the load of the equipment is increased, the applied force can be absorbed by a certain displacement on the rail, so that various equipment with different loads can be obtained without changing the size of the seismic isolation device 1. It can correspond to.

  Moreover, the position and the number of rolling grooves are not limited to this embodiment, and one or a plurality of rolling grooves can be formed at symmetrical positions on both side surfaces of the rail. Further, the positions and the number of the through paths are not limited to the present embodiment, and the same number as the rolling grooves can be formed at any position in the slider corresponding to the position of the formed rolling grooves.

  When the sliders 8 and 9 run to the end along the rails 6 and 7, the sliders 8 and 9 stop against the stopper 21, so that the seismic isolation device 1 is damaged even when the displacement of the rails 6 and 7 exceeds the movable length. Can not be.

(Embodiment 2)
With reference to FIG. 7, the electrical wiring installation using the seismic isolation device 1 for the cable rack 34 attached to the ceiling portion 33 will be described.

  First, the switchboard 31 which is an electric board is installed in the floor part 32 of a building of an earthquake-resistant structure. The steel plate 2 is attached to a ceiling slab or a steel ceiling 33 with bolts, and the steel plate 3 is fixed to a suspension bolt 35 of the cable rack 34. Two seismic isolation devices 1 are installed at intervals of 2 meters or less in parallel with the extending direction of the cable rack 34. A cable 36 is laid on the cable rack 34, and the cable 36 is connected from a top opening 37 of the switchboard 31 to a terminal provided in the switchboard 31 (not shown). The electrical panel includes a distribution panel, a distribution panel, a control panel, and the like. Further, the cable rack 34 can be a cable rack with rollers formed by spanning a plurality of crosspiece members each having a roller bearing provided with a roller attached to two frame members.

  When an earthquake force greater than the static friction force acts between the rails 6 and 7 and the sliders 8 and 9 when an earthquake occurs, the sliders 8 and 9 start to move along the rails 6 and 7. Then, the cable rack 34 moves relative to the ceiling 33 in the direction opposite to the direction of the seismic force. At this time, the period of shaking of the cable rack 34 can be delayed from the period of shaking of the earthquake by the elastic force of the coil springs 11, 12, and it is possible to suppress the action of the seismic force on the cable rack 34. That is, since the swing of the cable rack 34 is reduced, the relative displacement between the switchboard 31 and the cable 36 is suppressed, and no external force is applied to the terminals provided in the switchboard 31, thereby preventing damage to the terminals. Furthermore, when the shaking of the earthquake changes in the opposite direction, the relative positions of the cable rack 34 and the ceiling portion 33 can be restored by the restoring force of the coil springs 11 and 12.

  Moreover, since the seismic isolation device 1 forms the rolling groove 19ab, the rails 6 and 7 and the sliders 8 and 9 have a structure in which the rolling grooves 19ab are engaged with each other via a plurality of steel balls 18. . As a result, even if a tensile force is applied between the pair of sliders 8 and 9 and the rails 6 and 7, a constant load of the cable rack 34 in which the cables 36 are laid can be supported. Therefore, when the cable rack 34 is suspended from the ceiling portion 33, the steel plate 2 can be fixed to the ceiling portion 33 and the cable rack 34 can be fixed to the steel plate 3 and suspended.

(Embodiment 3)
In FIG. 8, the case where the seismic isolation apparatus 1 is used for the lighting fixture 41 attached to the ceiling part 42 is shown. The difference between the present embodiment and the first embodiment is that the equipment that is suspended from the ceiling portion 42 is the lighting equipment 41, and the lighting equipment 41 is not connected to other equipment. Since other points are the same as those of the first embodiment, description thereof is omitted.

  The seismic isolation device 1 is fixed to an H-shaped steel 43 in which a steel plate 2 is attached to a ceiling portion 42, and a suspension bolt 44 of a lighting fixture 41 is fixed to the steel plate 3.

  Since it comprises in this way, it can suppress that a shaking force acts on the lighting fixture 41 similarly to Embodiment 1, and can prevent that the lighting fixture 41 shakes like a pendulum. Thereby, damage to the lighting fixture 41 can be prevented. Furthermore, when the shaking of the earthquake changes in the reverse direction, the relative positions of the lighting fixture 41 and the ceiling portion 42 can be restored by the restoring force of the coil springs 11 and 12.

(Embodiment 4)
In FIG. 9, the case where the seismic isolation apparatus 1 is used for the chandelier 45 attached to the ceiling part 46 is shown. This embodiment is different from the third embodiment in that the equipment that is suspended from the seismic isolation device 1 is a chandelier 45. Since other points are the same as those of the third embodiment, description thereof is omitted.

  In the seismic isolation device 1, the steel plate 2 is fixed to the ceiling portion 46, and a chain 48 that suspends the chandelier 45 by the mounting flange 47 is fixed to the steel plate 3.

  Since it is configured in this manner, it is possible to suppress the shaking force from acting on the chandelier 45 and to prevent the chandelier 45 from shaking like a pendulum, as in the third embodiment. Thereby, damage to the chandelier 45 can be prevented. Furthermore, when the shaking of the earthquake changes in the opposite direction, the relative positions of the chandelier 45 and the ceiling portion 46 can be returned to the original by the restoring force of the coil springs 11 and 12.

(Embodiment 5)
With reference to FIG. 10, the seismic isolation apparatus 51 of other embodiment of this invention is demonstrated. The seismic isolation device 51 is used by being fixed to the ground below the building built via the seismic isolation device and to the cable rack for laying the wiring connected to the equipment attached to the building. However, since the related configuration and related operations of the rail and the slider are the same as those in the first embodiment, description thereof will be omitted.

  The seismic isolation device 51 includes a flat flange-shaped one flange plate 52 and two flange plates 53 formed in a rectangular shape. The flange plate 52 is provided with a flat spring fixing plate 63 protruding from the center of both side edges in the longitudinal direction. In addition, the flange plate 52 and the two flange plates 53 are provided with straight rails that are spaced from each other and the longitudinal directions thereof are orthogonal to each other. A pair of sliders are provided so as to be able to travel along the rails. The pair of sliders are attached to both ends of a flat plate-like connecting member 61 installed between the two flange plates 53 with the extending direction of the rail 62 attached to the flange plate 52 as the longitudinal direction. The pair of sliders are connected to each other by a connecting member 61. Between the connecting member 61 and the flange plate 53, a coil spring 60a having one end fixed to the central portion of the connecting member 61 and the other end fixed to each central portion of the flange plate 53 is stretched. In addition, a coil spring 60 b in which one end is fixed to the central portion of the connecting member 61 and the other end is fixed to a bolt 64 attached to the spring fixing plate 63 is stretched between the connecting member 61 and the spring fixing plate 63. Yes.

  The flange plate 52 has a plurality of bolt holes 54 at both ends and is fixed on the ground of a building built via a seismic isolation device, and the flange plate 53 fixes the cable rack 55 with a roller. The frame members 56 of the cable rack 55 are fixed to the upper portions of the flange plates 53 by bolts 57, and both ends are connected by connecting bars 58, respectively. The cable rack 55 is formed by spanning a plurality of crosspiece members 59 around two frame members 56. A roller bearing having a roller is attached to the crosspiece member 59.

  Next, the operation of the seismic isolation device 51 will be described. The flange plate 52 is fixed on the ground with the extending direction of the rail 62 as the x-axis direction. At this time, the longitudinal direction of the spring fixing plate 63 is the y-axis direction. For example, it is assumed that the seismic force from the ground acts on the flange plate 52 in the positive direction of the x axis and the y axis. At this time, the connecting member 61 travels relatively on the rail 62 in the negative direction of the x-axis, and travels relatively on the rail attached to the flange plate 53 in the positive direction of the y-axis. Thereby, the flange plate 52 moves in the direction of the seismic force, but the cable rack 55 fixed to the flange plate 53 moves in the direction opposite to the direction of the seismic force. Similarly, the cable rack 55 moves in a direction opposite to the direction of the exciting force regardless of which direction of 360 ° in the xy plane is applied to the flange plate 52. Therefore, even if an exciting force in any direction within the xy plane acts on the ground, the shaking force of the cable rack 55 can be suppressed because the exciting force does not act on the cable rack 55. Furthermore, the relative position of the flange plate 52 and the cable rack 55 can be restored by the restoring force of the coil spring 60ab.

(Embodiment 6)
With reference to FIG. 11, the electrical wiring installation used for the cable rack 55 which installs the seismic isolation apparatus 51 on the ground 65 is demonstrated.

  The seismic isolation device 51 is installed by fixing the flange plate 52 with bolts on the ground 65 below the floor surface 68 of the building built on the seismic isolation device 73 and fixing the flange plate 53 to the cable rack 55. ing. A cable 66 is laid on the cable rack 55. A switchboard 67 is installed on the floor 68 of the building. One end of the cable 66 is embedded in the ground, and the other end includes a cable rising portion 69, a cable portion 70 extending in the lateral direction of the cable rising portion 69, and a connecting portion 71 thereof. The connecting portion 71 is laid on the cable rack 55 with an extra length. The cable rising portion 69 is drawn into the lower surface opening 72 of the switchboard 67 and connected to a terminal provided in the switchboard 67. Here, since the seismic isolation device 73 is to prevent damage to the building by absorbing the shaking of the earthquake and suppressing the seismic force acting on the building, the building built on the seismic isolation device 73 The floor surface 68 does not shake with respect to the ground 65.

  With this configuration, according to the present embodiment, when an earthquake occurs, the seismic force is not transmitted to the building, and the floor surface 68 of the building does not shake with respect to the ground 65. However, the ground 65 on which the seismic isolation device 51 is installed shakes due to the earthquake. Then, the cable 66 embedded in the ground also shakes in the same manner. However, since the connection portion 71 between the rising portion 69 of the cable 66 and the cable portion 70 is laid on the cable rack 55, On the other hand, the amount of displacement is small, and shaking is reduced. Therefore, it is possible to suppress the force exceeding the allowable force from being repeatedly applied to the connecting portion 71 and prevent the cable 66 from being damaged. Furthermore, when the earthquake shake changes in the opposite direction, the relative position of the cable rack 55 and the ground 65 can be returned to the original by the restoring force of the coil spring 60ab.

  In addition, compared to the case of absorbing the seismic force only with the cable extra length as before, the cable extra length can be shortened and the installation space can be reduced, and it is special when installing and fixing on the ground. Construction is not necessary. Furthermore, since the cable rack 55 is used, the cable portion 70 can move smoothly on the cable rack 55, so that the vibration force applied to the connection portion 71 can be reduced.

  As mentioned above, although this invention was demonstrated using Embodiment 1-6, this invention is not limited to these. In short, the seismic isolation device according to the present invention is installed between the building and the equipment, and delays the period of shaking of the equipment from the period of shaking of the earthquake to act on the fixed part between the building and the equipment. It can be used to suppress seismic force.

DESCRIPTION OF SYMBOLS 1 Seismic isolation device 2, 3 Steel plate 4, 5 Spring fixing plate 6, 7 Rail 8, 9 Slider 10 Connecting member 11, 12 Coil spring 18 Steel ball 19ab, 20ab Rolling groove 22 Slider legs 23, 24 Through passage 25 End plate 27 Retainer 31 Switchboard 32 Building floor 33 Building ceiling 34 Cable rack 35 Suspension bolt 36 Cable 41 Lighting fixture 45 Chandelier 51 Floor seismic isolator 52, 53 Flange plate 55 Roller cable rack 56 Frame member 59 Frame Member 60ab Coil spring 61 Connecting member 62 Rail 65 Ground 66 Cable 67 Power distribution board 69 Cable rising part 70 Cable part 71 Connection part 73 Seismic isolation device

Claims (3)

A pair of flat plate-like support members arranged opposite to each other, a straight rail that is supported by the opposing surfaces of the pair of support members, and that is spaced from each other and orthogonal to each other, and straddles the rails A pair of sliders having leg portions and traveling along the rails; and a connecting member for connecting the sliders to each other; and the pair of supporting members are fixed to the building and the equipment attached to the building, respectively. In the seismic isolation device used,
A rolling groove having a semicircular arc shape in which a steel ball rolls is formed on the inner surface of the leg portion of the slider straddling the rail and on both side surfaces of the rail facing the inner surface, and a plurality of rolling grooves are formed in the rolling groove. The steel is mounted with the steel ball, a through hole parallel to the rolling groove is formed in both ends of the slider, and the rolling groove rolls on both ends of the rolling groove of the slider. A guide member for guiding the sphere to the through hole is provided;
A seismic isolation device, wherein coil springs are respectively stretched in four directions along the rail between the connecting member and one of the support members. A suspension member fixed to the ceiling of the building, a cable rack supported by the ceiling through the suspension member, an electric panel fixed to the floor of the building, and laid on the cable rack In the electrical wiring equipment formed by drawing the cable made from the top of the electrical board and connecting to a terminal provided in the electrical board,
The said suspension member is being fixed to the said ceiling part via the seismic isolation apparatus of Claim 1, The electrical wiring installation characterized by the above-mentioned. An electric board fixed to a building built on the ground via a seismic isolation device and a cable embedded in the ground are raised in a space provided below the electric board to the electric board In an electrical wiring facility having a cable start-up portion to be pulled in,
The cable portion extending in the lateral direction of the cable rising portion is installed on a cable rack placed on the seismic isolation device according to claim 1 installed on the ground, and the cable rack is An electrical wiring facility characterized in that a plurality of crosspiece members are stretched over two frame members, and the crosspiece members are attached to the frame via roller bearings.

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