JP5229935B2 - 梃 Crank chain mechanism group type mechanical seismic isolation device - Google Patents

Description

  The present invention relates to a mechanical seismic isolation device for a building structure.

There are many types of seismic isolation devices for buildings due to earthquakes. Even in the swing type seismic isolation device with the base of the column rising, if the ground shakes, the vertical difference of the seating part will occur. 357484 ]. The seismic isolation structure that prevents the rolling of a durable building made of strong steel that can withstand a gravitational load of more than 10,000 tons at the base of the column for more than 100 years is unknown.

Even in the case of a major earthquake in the Great Kanto Earthquake, even if the ground shakes reciprocally move 3 m in diameter in 1 second, it is possible to make a machine with a strong seismic isolation structure by setting the desired numerical value at 3 m or 4 m at the design stage. It has a structural ability to withstand strength even if the impact gravity load on the base of the pillar of the building is 10,000 tons or more, and it has a durability of more than 100 years, and the ground shakes. However, the construction of a building equipped with a mechanical seismic isolation device that completely prevents the shaking of the column is an issue. This is an additional matter of Japanese Patent Application No. 2006-357484. Structures that apply gravity and anti-gravity, such as swings, skateboards, seesaws, and roller coasters, have been used for a long time in playground equipment, pendulum clocks, furniture, industry, machinery, etc., and various developments will continue as long as the earth has gravity. Furthermore, it is a structure using a stepladder type structure that has a trapezoidal shape by a connecting method that can be bent, stretched, bent, and swiveled, such as a folding desk and table, and a structure that uses columns, braces, beams, etc. The four-branch (bilateral) chain mechanism is also a known structure for a long time.
Therefore, by applying the principle of the four-bar chain mechanism structure, the pillars of the building were lifted from the ground with a seismic isolation structure that uses only the natural weight without using a power supply or a computer, and floated like a linear motor car. In any direction, the ground shakes in the direction of the east, west, south, and north due to a strong earthquake, and the column is realized using any means to maintain a fixed position that does not shake in the original space even if it is tilted repeatedly It is the realization of a device that can experience (actually) the shaking (longitudinal and horizontal) of the feet of a light laborer when the light laborer on a tightrope takes a horizontal bar and takes a rope on a tightrope. Or from the rope in the air (position) (R position) as if the base of the building's pillar (the position of 0) itself is a tightrope, like the iron core of a thread-cylinder that goes to the tightrope of a playground equipment, Off There does not fall, the construction of buildings with a immobile seismic isolation device from the position of 0 point to an object, the gravitational measures challenge in artificial techniques.

In order to solve the above problems, the present invention provides a base in the form of a circular belt or polygonal section on the ground foundation on which a pillar of a building is built, and the central part of the circular belt on the top of the base. to set up one by one inclined face and became pedestal with swirling groove in one section, set up a swirling board mounted with lever crank linkage mechanism on each of the inclined base, said swivel plate is pivot axis The saddle crank chain mechanism is pivotally connected to a pedestal with a trapezoidal main pillar, a column, and a ceiling beam that are provided opposite to each other on the swivel. Consists of a chain mechanism, the saddle crank chain mechanism is arranged in the form of a section screen, and a straight cone with a reverse saddle is mounted at the center so that the saddle can be pivoted to the ceiling beam of the saddle crank chain mechanism at multiple points. To support the free inclination of the cone, and at the apex of the cone The bottom plate root portion of the pillar of the building constitutes a lever crank linkage mechanism group formed by rotatably supporting a spherical bearing, by the action of the lever crank mechanism of lever crank linkage mechanism the ground by the earthquake swing laterally As the cone swings about the spherical bearing as a fulcrum, the collar part inclines in the direction of movement of the ground, and the pillar of the building integrated with the apex of the cone stops in a suspended state in space. The building will be a seismic isolation device with a crank chain mechanism group that does not shake.

In order to solve the above-described problems, the present invention provides a seismic isolation device including the saddle crank chain mechanism group, wherein the swivel center axis (S) is a main column lower shaft (A) and a column lower shaft. (C) A saddle crank chain mechanism which is provided closer to the main column lower shaft (A) side of the hill than the center of the center so as to face substantially the same direction as the swaying direction when the ground swings laterally due to the occurrence of an earthquake. The center part of the body tilts in the direction in which the ground moves, and the turning center axis (S) of the other part of the saddle crank chain mechanism moves in the direction of shaking, and the center part of the circumferential band shape than the turning center axis (S) Since the connecting part between the upper ceiling beam and the flange located closer to the center moves slightly behind the turning center axis (S), the direction of the swing is closer to the hill side than the turning center axis (S) of the turntable. force couple opposing force to pivot the pivot plate pivot axis (S) to the central function as Moment is generated, the swivel starts turning, the main pillar and support on the swivel are tilted forward and agile, and the tilted swivel on the pedestal is restored to its original shape with restoring force after the earthquake. Preferably, the seismic isolation device is provided with the above-described saddle crank chain mechanism group.

On the ground foundation (a) on which the pillars of the building are to be built, a base (i) is installed on the circumferential belt shape or the polygonal screen screen belt shape (Fig. 1), and the upper surface (1-2) is inclined to the center. The pedestal with the groove for turning (ki, 1-11) is installed in the form of multi-zone screen strips (5-8 locations). In FIG. 1, the pedestal (U) in the 8th section has a slanted surface with an inclination angle ∠θ, and the pedestal (with groove) has a circular or semi-circular shape on the top surface and a turning groove on the bottom surface. There is an overall schematic plan view showing a structure in which an attached rotating disk (e.g., 12 to 21) is mounted on each 1 section screen, and 8 (I to VIII) are mounted on each side of the 8 sections. . For convenience of explanation, the description will be made assuming that eight sets of pedestals (U) and swivel boards (E) are installed in the shape of an octagonal area screen strip.
On the bottom surface (15-21, 12) of the swivel which is in contact with the pedestal top surface (3-10), a swivel groove (roller) and a roller wheel (conical roller, oh) are provided for rolling roller receiving. Installed and constructed to withstand heavy loads, the turning center axis (S, kingpin) of the swivel is located at the position of (S1) below the hill on the main column axis (A) side from the circular center point (N) of the swivel, Further, the center axis of the swivel mounted on the inclined pedestal surface is also set to the same axial position (S1) as the position (S2) on the hill side of the pedestal. The rotating peripheral speed form of the swivel is a swivel structure in which an inconstant elliptical motion is made, and the slant swivel repeats the anti-turning pendulum motion smoothly and smoothly on the tilt pedestal. FIG. 1 is an overall side view showing a symmetrical arrangement shape having the same similar shape from No. 1 to No. 8 when eight swivel boards are mounted. For convenience of explanation, they are arranged in an octagonal zone from No. 1 to No. 8 in the clockwise direction. Group I is north, Group II is northeast, Group III is east, Group IV is southeast, Group V is south, Group VI is southwest, Group XII is west, Group VIII is northwest ...・ The order.

  FIG. 3 will be described with reference to FIG. On the inclined swivel board (III), a crank chain mechanism consisting of a main column (ke), a ceiling beam (sa), and a column (ko) is mounted, and the connecting shafts (A, B, The C, D, E, and F) bosspin devices are connected by bosses and pins such as external roller bearings (in the circle in FIG. 6), and all the connecting portions have a load-bearing connection structure that can withstand heavy loads. Fig. 5 shows the same structure, with the main column at the front of the vertical crank chain mechanism on the swivel and the column at the back forming a trapezoid with members such as I-beam shaped steel, columns, and H-shaped steel. It is built as a pillar of shape (Fig. 5), and it has a robust structure that can withstand the impact gravity load of 10,000 tons or more in the vertical direction and that the ground can withstand the reciprocating momentary movement of 3 meters per second.

  On the inclined pedestal of the octagonal section screen, a mechanism consisting of eight inclined swivel machines and a saddle crank chain mechanism (four lever chain mechanism) mounted on each of the eight swivel machines is a saddle crank chain mechanism. The four-joint chain mechanism is arranged in the shape of an octagonal section, and is mounted in such a shape that a straight cone with a reverse barb is placed at the center, and a column is formed by the apex of the barbed right cone. A mechanism that supports the base of the bottom plate (t) is referred to as a saddle crank chain mechanism group. Further, hereinafter, the reverse-clawed straight cone is abbreviated as a cone.

The structure of a straight cone with a reverse hook (abbreviated as a cone) is the inverted cone inserted into the center of a swivel board arranged at eight locations in an octagonal zone and the four-bar chain mechanism installed at the top of each. It is mounted in a shape to be covered (pointed hat shape), and the ridge part (shi) of the cone is supported by the upper surface (24-25) of the ceiling-type beam, and it serves as a connecting shaft by the boss pin (F), which also serves as a turning axis. Is the axis. Further, a cross joint device (E) is attached to the lower part of the swivel shaft to form an integral part (inside of the circle in FIG. 5), which also serves as a support shaft and swivel shaft corresponding to the free inclination of the cone. Gravity load over the support and swivel axes (E, F) of the cone is divided between the main column upper shaft (B) and the column upper shaft (D), and the vertical line of the main column upper shaft (B) The distance (SG to SS ') between (BG) and the vertical line (SS') of the turning center axis (S) of the swivel is the shortest distance that is the most contracted in the most upright state of the main column (Fig. 4). However, the distance (SG to SS ′) = T is an interval, and T is a structure that causes generation of a force for turning the swivel by forming a ratio of the arm length of the turning moment of the swivel.
Each of the three vertical lines BG, BH, and BI in FIG. 2 is a parallel line, and the angle ∠BAL formed by the main column axis (AB) and the horizontal line (LM) that intersects the three lines is the main column (ke). The force at which the full inclination and the upright motion are activated changes ∠α, ∠β, and ∠γ in proportion to the ground shaking force. ∠α is ∠ABG in the upright state of the main pillar (ke), and is an upright stop angle. Further, ∠RBA acts as a caster angle to act on the turning operation of the swivel, and further, ∠RBA acts to push up and slide the swivel itself on the inclined pedestal up to the inclined pedestal slope. Therefore, because of the earthquake, the turning center axis (S) of the tilting swivel is on the hill side below the midpoint between the main column axis (A) and the column axis (C). A couple moment is generated about the turning center axis (S) corresponding to the inclination angle ∠DCL (δ), and the turning operation of the inconstant elliptical motion form is instantly started by the caster effect. The swivel is half-turned freely in an inclined state, and the saddle crank chain mechanism is a structural device that can be repeatedly actuated with forward leaning upright.
After the earthquake, the main column, the column and the swivel are restored to their original positions due to the caster effect, and a restoring force to return to the original shape (FIG. 1) works. The inclination angle of the pedestal (） θ) corresponds to the camber angle, and the cone support shafts and turning axes (E, F) are similar to the toe-in (toe-out). This is a structure that works very much like the wheel alignment device. The top of the cone (R) has a spherical cross bearing device and is integrated with the base of the column. The column can be moved in the vertical horizontal plane while floating in the raised state and the suspended state. The pillar is a seismic isolation device characterized by a structure that does not shake.

FIG. 5 is a perspective view of a straight cone with a reverse ridge (edge) (in the shape of a cone, a straw hat or a pointed hat with a hollow interior). The cone has a robust structure using a material of thick steel plate, the collar portion is (shi), the bus bar portion is (su), the apex portion is (se), and the ceiling beam is (sa). 2 shows that the distance AC between the main column lower shaft (A) and the column lower shaft (C) on the swivel is set to the same length as the distance BD between the main column upper shaft (B) and the column upper shaft (D). FIG. 6 is a schematic side view of a parallel crank mechanism type showing a comparison of an inclination angle of a ceiling beam and an inclination angle of a main column and a column . FIG. 3 shows that the distance AC between the main column lower shaft (A) and the column lower shaft (C) is longer than the distance BD between the main column upper shaft (B) and the column upper shaft (D). FIG. 5 is a schematic side view of a saddle crank chain mechanism when the ceiling beam is set so as to be horizontal and parallel to the saddle portion in a side view. In normal times without earthquakes, it is desirable that the top surfaces (22, 23) and the buttocks (24, 25) of the ceiling-type beam be kept horizontal and parallel. It is desirable to set the interaxial distance (AC) in a timely manner so that the roll cross joint device (E) at the top of the ceiling beam is omitted and the ceiling beam and the heel portion are in an equilibrium state.

The order in which the force that causes the ground to shake due to the occurrence of an earthquake transmits the force acting on the entire seismic isolation device is as follows: First, the pedestal moves simultaneously with the shaking of the ground, and at the same time, the swivel board moves at an inconstant elliptical motion. The revolving force is repeated half a turn, and the force is separated and shared between the main column and the column of the saddle crank chain mechanism on the swivel board, and the main column (ke) and the column (this) repeat the upright and forward inclination. Change. As the main column rises and stands upright, the side of the cone moves closer to the main column and the gravity load on the column is placed on the main column according to the rate of the rising angle. In the upright angle, a shared load corresponding to the angle of the total gravity load is applied.作用 ABG works to push back the main column by the upright stop angle (or the upright residual angle of the main column 前 β) before 90 ° upright, and the force to push back is stronger as the gravity load on the main column is heavier Works.
It is a theory that the rolling force is changed to a force that lifts up by the movement of the main pillar. Therefore, the gravity load on the column uses the force coming from the side of the earthquake, and the gravity on the column is buffered by the gravity of the gravity itself by the movement of the main column (upright) standing upright, and the roll of the earthquake is swayed. The structure is not shaken by means of a structure that neutralizes the power. Furthermore, the force is transmitted to the ceiling beam, and the roll force of the earthquake is gradually dispersed and consumed by lifting and lowering the cone buttocks, changing to the inclination and shaking movement force of the cone buttocks. The force of the earthquake is gradually reduced and attenuated, and is transmitted through the side surface of the cone, which is the cone bus, and finally the force disappears at the point of reaching the base of the bottom plate of the column at the top of the cone. Therefore, the pillar has a structure that does not shake.
After the earthquake, the swivel returns to its original position, balances and balances, stops facing the front of the center, and the natural gravity (f) exerts a restoring force so that the swivel on the swivel is in front of the crank chain mechanism. The main pillar of the part stops together with the swivel while naturally turning in the direction of the sloped pedestal slope (S), and the eight main pillars and columns arranged in a circumferential belt shape are also in the direction of the center of the circumference. Forces that cause each other to fall toward each other in the center direction (resulting from the upright residual angle ∠ABG of the main column) work, and all eight units are held at the center of the octagon and are naturally balanced in the original shape. It has a back structure.

In FIG. 2, the vertical gravity load over the base of the bottom plate of the column (t) is in the form of the top of the cone on the top of the cone. Compared to (AB), the higher the cone height (F to R) [depth from bottom to top (h)], the more stable the base of the column and the heavier the gravity load of the column, the more stable There is sex. In addition, the apex of the cone supports the heavy load that is built on the base of the bottom plate of the column by installing a ball joint spherical bearing (chi) as a connecting shaft device with a load-bearing structure that can withstand heavy loads. The column is vertical at the same point with respect to the horizontal movement of the ground (horizontal extrusion, horizontal pull-in action) while floating at a certain height (Q to R) depending on the floating state with the base of the column lifted It has a structure that can stop at a position on the line . Even if the ground foundation is shaken by a reciprocating momentary movement of 3 m / s due to a large earthquake, the vertical line of the column can be affected by the buffering action of the saddle crank chain mechanism group or by the structure that copes with the horizontal plane movement of the ground. The movement is maintained and the building does not shake.

FIG. 3 is a schematic side view of the saddle crank chain mechanism group in a normal state without an earthquake. Let Q be the intersection of the vertical line (set, R) of the cone of Group III (East) cone and the ground foundation (A). The normal point of intersection between the vertical axis of the connection axis (B) of the main column (ke) that supports the base of the cone of the cone and the ground foundation (A) is (H). Let (G) be the intersection of the vertical line of the connecting shaft (B) and the ground foundation (A) when the column is upright. Also, let (I) be the intersection of the vertical line of the connecting axis (B) and the ground foundation (A) when the main column is tilted. When the distance (radius) from (G) to (I) is 2 m, the distance from (G to H) is 1 m, and the distance from (H to I) is also 1 m. Similarly, the opposite VII group (west) has a diameter of 4 m when the radius is 2 m. If the maximum amplitude (distance) and (reciprocal instantaneous travel distance, diameter of shaking) in the Great Kanto Earthquake are, for example, 2 m, it is possible to cope with ground shaking. In normal times without earthquakes, if the inclination angle (neutral state) of the main column (AB) is set to 60 ° and (GH) is set to 1 m, the length of the interaxial distance (BD) of the ceiling beam is The set numerical value of the length (AB) of the main pillar is determined. The desired maximum amplitude value (sway diameter) is determined by the desired inclination angle and length of the neutral state of the main column.

FIG. 4 is an overall side schematic view of Group III (East) and Group VII (West) when the ground foundation (A) swings west due to the occurrence of an earthquake. Regardless of the direction in which the ground foundation oscillates from east to west, north and south, the column and the apex of the cone (se) are moved in the direction in which the ground foundation swayed due to the function of the heel crank mechanism of the heel crank chain mechanism group. The force by the law of inertia that tries to react to the opposite side instantaneously and stay at the original position works, and stops at the position on the vertical line at the same point in the space (the point R). At the same time, the main pillars and pillars of the east side III group work by the action of the 梃 crank chain mechanism group that activates the 梃 crank chain mechanism group, and the main pillars and pillars of the west side VII group fall to the east. As a result, the bottom of the cone and the buttocks are tilted eastward and westward. In addition, the ridges of the cones of the North I group and the South V group begin to incline east and west while swaying and moving east along with the turning action of the turntable. The shape of movement of the heel of the cone is similar to the rotational movement of the bobbin cone of the play equipment, with the iron core of the rotating cone as the center point of immobilization, and the length of the cone's generatrix as the radius. It resembles the form of movement where the buttocks are hula hoops. Alternatively, it is similar to the movement mode of a dish that rotates in the air at the end of one bar.

  When the ground sways in the west due to the earthquake, the tilting swivel works instantaneously due to the generation of the moment of the couple, and the main pillar of the VII group (the VII) tilts forward to the east and the III group (east ) Main pillar (Kee III) rises upright. Furthermore, the main pillars (I and V) of I (north) and V (south) turn with the swivel from the direction facing the front to the east, and correspond to the inclination angle (∠θ) of the pedestal. The main column and the support column rise from the inclined state and are inclined to the side while being inclined to the side (the same angle θ as the inclination angle of the pedestal is the limit of the side inclination). At this point, the moment of the couple on the swivel vanishes and the turn stops. The main column and the column are stable because they have a trapezoidal shape (the same as the inclination of the pedestal at the rising inclination angle ∠θ). For example, the connecting and swiveling shafts on the ceiling beam that supports the conical ridges are regular octagons and are arranged at equal intervals, so that No. 3 (III F) and No. 4 (IV F) Due to the fixed distance between these points, the turning of the swivel board and the upright movement of the main pillar are both set as the limit position points where braking is applied and stopped. The maximum turning angle to the east and the west of the swivel is ∠40 ° (total ∠80 °), the setting of the position is the limit, and the upright limit angle of the main pillar and column is also set to ∠70 ° to ∠80 ° Is desirable. It has a structure that is similar to the relationship between toe-in, camber, and caster in an automobile steering system, and that has a structure that is similar to the function that receives the reversal force that is pushed back when the steering wheel is turned all the way to the right. Yes.

A column that stands vertically at the apex of the cone has a higher gravity load on the bottom base plate (t) of the column, or the height from the bottom (M) to the apex (set, R) within the cone. The higher the depth h (depth) (or the lower the center of gravity), the stronger the restoring force that tries to return the tilted bottom of the cone to the horizontal, and the stronger the force at the base (N) of the collar Work. When a cargo ship navigating the ocean is navigating in rough waves, the lower the center of gravity, the more the restoring force works and the same force that works to return the ship vertically. In FIG. 3, the apex (se, R) and the column are forced to build vertically, and the buttocks (shi) are forced to return to the original horizontal position, and the side of the side of the cone is the generatrix. Upright (∠
The main pillar is pushed back and pushed out by an inclination angle (∠BAL <∠≈80 °) (residual angle ∠β) close to β> ∠≈20 °. Tightrope lighter picks up a horizontal bar and works on a single rope as a structural device that responds to the lighter's foot wobbling and shaking (vertically and horizontally) while experiencing (actually feeling) This is a seismic isolation device that resembles the iron core of a tightrope winding conical piece in a form in which the apex of the pointed hat does not move even if the hips of the inverted straw hat and the pointed hat perform a hula hoop dance.

For example, even if the ground moves at a speed of 3 m at a speed of 1 second at a speed of 1 second, or if a heavy load with an impact gravity load of 10,000 tons or more is placed on a pillar, the seismic isolation device is made of steel and is structurally strong. It is possible to manufacture a seismic isolation device by setting a desired numerical value regardless of whether the ground amplitude value is 3 m or 4 m. What kind of severe earthquakes above the Great Kanto Earthquake level if the structure is compatible with the durability and proof strength of more than 100 years, and the structure that simultaneously sets the vertical motion isolation device described in Japanese Patent Application No. 2006-357484 Can also be supported. Seismic isolation based on a flexible idea that if the Shinkansen was a linear motor car from another perspective, the idea that “the pillars of the building were clinging to the ground foundation” was changed. If the device is a buried structure that is installed on the basement floor as a seismic isolation device for a population-intensive building, it is inconspicuous and has a significant and safe effect. If the earthquake is once in 100 years, if the durability and service life of the equipment is not maintained for more than 100 years, the manufacturing cost will increase and the cost effectiveness will be small. If the durability problem is 200 years or more, the effect will be great. If it is manufactured using a material that is sturdy, does not rust, and does not easily deteriorate, the durability problem is solved and the effect is immeasurable.

8 is an overall schematic top view of an octagonal area screen base and swivel. FIG. 3 is an overall schematic side view of a parallel crank mechanism type of a saddle crank chain mechanism group. FIG. 3 is a general schematic side view of a balanced type of normal crank chain mechanism group. The whole side view showing the operation of the saddle crank chain mechanism group when the ground shakes. The parts exploded view of a saddle crank, and the whole perspective view of a reverse cone-attached right cone. The parts perspective view of the main pillar (ke) and support | pillar (this) of a heel crank. The component perspective view of a ceiling type beam (sa) and a roll cross joint apparatus. The component perspective view of a roll cross joint. The component perspective view of a ball joint (chi).

A: Ground foundation I: Base (I-VIII) U: Pedestal (1-11) (I-VIII) E: Swivel (12-21) (I-VIII) O: Conical roller: Swivel center axis (Kingpin) Ki: Pedestal turning groove Ku: Turning board turning groove: Main pillars I to VIII Ko: Posts I to VIII Sa: Ceiling beams I to VIII
：: Cone ridge 円 錐: Cone busbar section ：: Cone apex そ: Building pillar ：: Building bottom plate, base ち: Ball joint spherical bearing or roll cross joint shown in Fig. 8 : Beam for floor of building A: main pillar lower axis (I-VIII) B: main pillar upper axis (I-VIII)
C: Support lower shaft (I to VIII) D: Support upper shaft (I to VIII)
E: Roll cross joint for heavy loads (I-VIII)
F: Rotating shaft boss, pin (I to VIII)
G: Vertical line of the upper axis B of the main column , the ground (A), and the intersection (at the time of the upright state) I to VIII, BG
H: Vertical line of the main column upper axis B, the ground (A), and the intersection (at the normal time) I to VIII, BH
I: Vertical line of main column upper axis B , ground (A), and intersections (when tilted) I to VIII, BI
LM: horizontal line of main column lower axis A (I to VIII)

Claims (2)

A base is installed on the ground foundation on which the pillars of the building are built, in the form of a circumferential belt or polygonal section screen, and a base with a groove for turning that is inclined to the center of the circumferential belt on the top of the foundation. One set is installed in each section, and a swivel with a saddle crank chain mechanism is installed on each inclined pedestal. The swivel is fixed to the pedestal so as to be pivotable about the swivel center axis. The saddle crank chain mechanism comprises a trapezoidal main column, a support column and a ceiling beam which are provided opposite to each other on a swivel so as to freely rotate to constitute a saddle crank chain mechanism. A straight cone with reverse rods is installed at the center of the screen, and the ribs are pivotally connected to the ceiling beam of the rod chain linkage mechanism at multiple points so that the cones can be tilted freely. Rotate the base of the bottom of the pillar of the building with a spherical bearing at the apex of the cone. Configure the lever crank linkage mechanism group formed by rotatably supported, works by the cone of lever crank mechanism of lever crank linkage mechanism the ground swing laterally by earthquake oscillating the spherical bearing as a fulcrum As the heel part inclines in the direction of movement of the ground, the pillar of the building that is integrated with the apex of the cone stops in a suspended state in the space , and the building does not shake. Seismic isolation device with In the seismic isolation device including the saddle crank chain mechanism group, the pivot center axis (S) of the swivel is set below the main column lower axis (S) below the center of the main column lower axis (A) and the column lower axis (C). (A) By being provided closer to the side, when the ground swings laterally due to the occurrence of an earthquake, the saddle portion of the saddle crank chain mechanism provided facing the substantially same direction as the swing direction is inclined in the direction in which the ground moves. The center axis (S) of the other crank chain mechanism other than the above moves in the direction of shaking, and the upper ceiling-type beam and the flange located closer to the center of the circumferential band than the center axis (S). Since the connecting portion moves slightly behind the turning center axis (S), a force in the direction opposite to the swaying direction acts on the lower side of the turning center axis (S) of the turntable and the turning center axis (S). moment of the couple to be turning occurs turning board the turning machine in the center of the beginning of the turning 2. The main pillar and the support on the swivel are actuated forwardly and abruptly, and the tilted swivel on the pedestal returns to its original shape with restoring force after the earthquake.震 Seismic isolation device with a crank chain mechanism group.

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