JP2008286213A - Linear motion type base isolation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling support type base isolation device with three frames built up with one another, having lighter weight and being easier to handle. <P>SOLUTION: The base isolation device 1 comprises: a base 2; a lower table 3 supported on the base 2 so as to be movable relatively to the base 2 in one horizontal direction; an upper table 4 supported on the lower table 3 so as to be movable relatively to the lower table 3 in the horizontal direction crossing one direction; a columnar lower rotor 7 laid between the base 2 and the lower table 3 for supporting the lower table 3 so as to be relatively movable in one horizontal direction, the lower rotor 7 having an axis being inclined to the horizontal direction; and a columnar upper rotor 8 laid between the lower table 3 and the upper table 4 for supporting the upper table 4 so as to be relatively movable in the horizontal direction crossing one direction, the upper rotor 8 having an axis being inclined to the horizontal direction. The body of each of the base 2, the lower table 3 and the upper table 4 is molded by bending a steel plate. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention, in general civil engineering and building structures, bridge piers, foundations, such as bridge girders of bridges supported by seismic isolation devices, seismic isolation buildings, or seismic isolation floors used in some floors in structures. This is a seismic isolation device used for isolating vibrations of substructures such as a frame floor, and particularly relates to a linear motion type seismic isolation device.

  For example, seismic isolation buildings and seismic isolation floors for preserving the building itself or precision equipment in the building during an earthquake are the bases and floors of the superstructure on seismic isolation devices installed on the substructure such as foundations and slabs. It is configured by supporting an upper structure such as a panel. The vibration generated by the lower structure is blocked without being transmitted to the upper structure by the upper structure being insulated from the lower structure by the seismic isolation device.

  In particular, in a rolling support type seismic isolation device using a roller (cylindrical rotating body), three frames are stacked, and a roller is arranged in one horizontal direction between two adjacent upper and lower frames. The rollers are arranged in two horizontal directions in the entire stacked frame (see Patent Document 1). A plurality of rollers are held on a rail such as a recess formed linearly on the frame while being held movably in one direction by a spacing member, and the axial movement of the rollers is constrained Retained.

  Since a rolling bearing type seismic isolation device alone does not have a restoration function after horizontal relative movement between vertically adjacent frames, the function of restoring the frame when relative movement occurs between vertically adjacent frames In order to provide the above, it is necessary to devise a method such as bending a concave portion or the like into which a roller enters as in the case of Patent Document 1 into a convex curved shape.

  A method of using a coil spring is generally used as a method of restoring the original position after the two frames that are vertically overlapped with the roller interposed therebetween (see Patent Documents 2 to 5). However, when the coil spring is arranged so that only axial expansion and contraction occurs as described above and the restoring force is used, the relationship between the amount of deformation of the coil spring and the restoring force becomes linear. Since a restoring force in the opposite direction to the deformation is always generated during the occurrence of the problem, there is a problem that it takes a long time to finish until the original position is restored.

  In addition, when the coil spring is used only in the form of extending and contracting in the axial direction, the coil spring has a natural frequency, so that the frame is returned to the original position when the natural frequency of the coil spring matches the frequency of the frame. On the contrary, the resonance may amplify the vibration of the frame.

  If the coil spring is used in such a way that it can be rotated around one end while expanding and contracting in the axial direction (see Patent Document 6), the relationship between the deformation amount of the coil spring and the restoring force becomes a sine curve, and the natural vibration Since there is no use state, there is an advantage that resonance with the frame can be avoided and the relative movement of the upper and lower frames can be terminated early.

  However, when a coil spring is used so that it can be rotated around its one end while expanding and contracting in the axial direction as in Patent Document 6, the end opposite to the fixed end of the coil spring moves on a linear track. It is necessary to install a guide rod and a slider that can travel along the guide rod as much as possible.

  In addition, even if relative movement occurs in any direction on the plane between the upper and lower frames, a pulley is passed between the slider and the frame so that the other end of the coil spring can move on the linear track. It is necessary to stretch the wire, and the number of components of the seismic isolation device for providing a restoration function increases.

  In addition, when a roller is used as a support body, in order for the roller to roll smoothly, a certain amount of clearance is secured between both ends of the roller and the side surface of the recess while the roller is in the recess to reduce resistance. It is necessary to do (refer patent document 7).

  However, in the case of Patent Document 7, by arranging the roller shaft horizontally as shown in FIG. 18- (a), the torsional moment acts between the upper and lower frames within the clearance range. The roller tries to rotate and displace randomly. As a result, the axis of the roller facing the width direction of the recess as shown in (b) is irregularly inclined with respect to the width direction of the recess as shown in (c). ) Is obstructed and the function of seismic isolation may not be performed.

  To prevent random rotation of the rollers due to torsional moment, the clearance between the end surface of the rollers and the side surface of the recess should be eliminated. It is difficult to maintain the perpendicularity of the cut surface (end surface) to the axis. For this reason, it is inevitable that a manufacturing error occurs on the end surface of the roller. In addition to the manufacturing error generated in the recess, the entire end surface of the roller is brought into full contact with the side surface of the recess, that is, between the end surface of the roller and the side surface of the recess. It is almost impossible to completely eliminate the clearance.

  Therefore, as long as the roller is constrained from both end faces, the clearance remains as a result, and when the torsional moment acts between the upper and lower frames due to the presence of this clearance, the roller is irregularly inclined.

  Therefore, the applicant has previously made use of the characteristics of the coil spring of Patent Document 6 and eliminates the need for a peripheral member for exhibiting the characteristics, while improving the stability of the roller against the torsional moment. (Refer to Patent Document 8).

JP-A-11-173376 (FIGS. 1 and 2) JP-A-6-136923 (FIG. 1) Japanese Patent Laid-Open No. 6-288073 (FIG. 2) JP-A-7-71109 (FIG. 2) Japanese Laid-Open Patent Publication No. 9-112011 (FIGS. 3 to 5) JP 2000-337437 A (FIGS. 2 and 3) JP 2004-225848 A (paragraphs 0048 to 0054, FIGS. 1 to 5) JP 2006-037992 A (FIGS. 1 to 6)

  The seismic isolation device of Patent Document 8 keeps the shafts of the lower rotating body and the upper rotating body inclined with respect to the horizontal so that both rotating bodies can be restrained in the axial direction only by one end face. By eliminating the gap between the constrained one end face and the recessed portion of the frame, it is possible to improve the stability of the rotating body against the torsional moment acting between the upper and lower frames.

  However, since the frame constituting the main body of the seismic isolation device of Patent Document 8 is actually formed from a combination of steel materials such as shaped steel, the frame itself is complicated to manufacture and the mass of the seismic isolation device main body is large. It has a size that cannot be transported by human power and is difficult to handle.

  The present invention was made by further developing the seismic isolation device of Patent Document 8, and proposes a linear motion type seismic isolation device in a form that is lighter in weight and easier to handle.

The linear motion type seismic isolation device of the invention according to claim 1 is:
A base, a lower table supported on the base so as to be movable relative to the base in one horizontal direction, and a lower table supported on the lower table so as to be relatively movable in a horizontal direction intersecting the one direction with respect to the lower table. A supported upper table,
A cylindrical lower rotating body that is interposed between the base and the lower table and supports the lower table so as to be relatively movable in the horizontal direction;
And a columnar upper rotating body that is interposed between the lower table and the upper table and supports the upper table so as to be relatively movable in the horizontal direction intersecting the one direction. In the seismic device,
The base, the lower table, and the main body of the upper table are formed by bending a steel plate.

  Of the three frames arranged in a three-tiered manner, in claim 1, the base corresponds to the lowermost frame, the lower table corresponds to the middle frame, and the upper table corresponds to the uppermost frame. Equivalent to. When vibration such as an earthquake occurs, the lower table linearly moves in one horizontal direction with respect to the base, and the upper table moves linearly in one horizontal direction intersecting the one direction with respect to the lower table. As a result, the upper table moves relative to the base in an arbitrary horizontal direction. Hereinafter, in some cases, the base, the lower table, and the upper table may be collectively referred to as a frame.

  In claim 1, since all three frames of the three-tiered structure that is the main body of the seismic isolation device are made of steel plates, the structure of the frame itself is simplified as compared with the case where it is assembled from steel materials such as section steel, and the rails described later In addition, the manufacturing including the fixing of parts such as a supporting material for supporting the roller and a receiving material for locking the roller is simplified. Moreover, since all the frames which are the main body of a seismic isolation apparatus are shape | molded by the bending process of a steel plate, since the rigidity of a flame | frame itself improves, possibility that a seismic isolation apparatus itself will generate a vibration will fall.

  For example, the frame is formed by bending both sides of one steel sheet in one direction, so that a member to be locked to which the end surface of the rotating body group is locked in addition to a rail, a support material, and a receiving material, which will be described later, In addition, it is manufactured in a form that secures a space for storing the rotating body and the like. In addition, since the seismic isolation device can be manufactured by combining steel plates, it is possible to reduce the cost required for manufacturing. The bending process is performed cold or hot.

  The upper and lower frames, the base and the upper table, are formed by bending a single steel plate, and the middle frame, the lower table, can be formed by bending a single steel plate in the same way as the base and upper table. It is. However, if the base and the upper table are formed as a steel plate unit from a single steel plate, for example, the intermediate lower table is formed by joining two steel plate units back to back as described in claim 2. Will be.

  A rail is fixed to each of the opposing surfaces of the base and the lower table, and the opposing surfaces of the lower table and the upper table, and the end face of the rotating body group is locked to at least one of the opposing surfaces. The material is fixed. For this reason, in Claim 1, the rigidity and strength of the frame main body are enhanced by adding the rail and the locked material to the steel plate constituting the main body of the frame. For this reason, the steel plate itself can be thinned, the weight of the frame can be reduced, the handleability is improved, and the cost is reduced.

  According to a second aspect of the present invention, in the first aspect, the base and the main body of the upper table are formed in the same shape from one steel plate, and the lower table constitutes the base or the main body of the upper table. It is a constituent requirement that two steel plates are joined back to back.

  In this case, since the main body of the base composed of one steel plate and the main body of the upper table composed of the same steel plate have the same shape, the form of the base and the upper table is unified. The standardization of elements makes it possible to improve the efficiency of manufacturing seismic isolation devices. Since the lower table is formed by joining two steel plates constituting the base and the main body of the upper table back to back, two types of steel plates may be prepared for manufacturing the seismic isolation device.

  As a result, in claim 2, the seismic isolation device can be constructed by preparing four steel plate units with rails added to the steel plate formed in the same shape, and the components of the seismic isolation device are unified (standardized). Therefore, the production efficiency is improved as compared with the case where the components are different. Moreover, since the form of the three frames constituting the seismic isolation device is unified, the types of parts and the number of parts are reduced as compared with the case where they are different from each other, so that the production cost can be further reduced. .

The invention according to claim 3 is the invention according to claim 1 or claim 2,
Two rows are arranged in parallel in a direction perpendicular to the rolling direction of the lower rotating body and the upper rotating body, with the axes crossing each other, and a plurality of rows are arranged in the rolling direction for each row. Configure the rotating body group,
Rails in which the pair and two rows of rotating bodies simultaneously contact each other on the opposing surfaces of the base and the lower table and the opposing surfaces of the lower table and the upper table. Formed or fixed,
The rails simultaneously contacting the two rows of rotating bodies are formed from a steel plate and fixed to each of the opposing surfaces of the base and the lower table and the opposing surfaces of the lower table and the upper table. Is a configuration requirement.

  In this case, since the ratio of the steel plate to all the components of the seismic isolation device is increased, the production of the seismic isolation device is further simplified.

  According to the third aspect, the lower rotating body and the upper rotating body are each composed of two rows of rotating body groups to form a pair. Therefore, when the upper and lower frames are moved relative to each other, the pair of rotating body groups are formed on the upper and lower frames. Or roll in contact with a fixed rail. The rail is formed or fixed on both the opposing surfaces of the base and the lower table, and both the opposing surfaces of the lower table and the upper table.

  In order to ensure the stability of a set of rotating bodies during rolling, the end faces of the rotating bodies are locked at both side positions of the two sets of rotating bodies in a set of rails. The material may be formed or fixed. In this case, the lower rotating body and the upper rotating body roll while being locked to the locked material at the end surfaces. The material to be locked is fixed to the frame at a position where it is locked to at least one of the two end surfaces in the width direction of the two rows of rotating body groups. The locked material is disposed on at least one side of the opposing rail.

  Since the two rows of rotating body groups roll as a set, they are held by a guide plate having openings corresponding to the number of rotating bodies, but when both ends of the rotating body group are constrained by the guide plate openings. It is not always necessary to form a locked material. When the material to be locked is formed, the lower rotating body and the upper rotating body are locked to the locked material at the end surfaces, and are restrained against lowering or rising due to the inclination of the axis of the rotating body. .

  In claim 3, two rows of rotating body groups each composed of a lower rotating body and an upper rotating body are assembled into one set, so that even if a plurality of rotating body groups are assembled, the lower rotating body and the upper rotating body as a support are The area occupied between the upper and lower frames is reduced. For this reason, it becomes possible to arrange a plurality of sets of rotating body groups between the upper and lower frames as described in claim 4 and to improve the stability of the frames in use. Further, it is possible to keep the plane area of the seismic isolation device itself small while increasing the number of arranged rotating bodies.

  The seismic isolation device according to claim 4, wherein a plurality of sets of the lower rotating bodies, in which two groups of rotating bodies are arranged in parallel in a row, are arranged between the base and the lower table, and the groups of rotating bodies are arranged in two rows in parallel A configuration requirement is that a plurality of sets of the upper rotary bodies are arranged between the lower table and the upper table.

  According to a third aspect of the present invention, the axes of the rotating body groups in each row intersect with each other, so that the entire rotating body group can always be in contact with both sides of the rail or the rail and the guide plate at the end face. Therefore, stability during rolling is achieved, and rattling is avoided.

  By interposing the lower rotating body and the upper rotating body between the upper and lower frames (between the base and the lower table or between the lower table and the upper table) with the axis inclined with respect to the horizontal, FIG. 17- (a) As shown, the lower rail is in contact with the lower bus bar at a part of the lower end face. The upper rail is in contact with the upper bus bar at a part of the upper end surface. The loads P1 and P2 are received, and the reaction forces R1 and R2 that are vertically upward are received from the base 2 on the lower bus and the end face.

  The vertical forces P1, P2, R1, R2 acting on each bus bar and each end face are divided into components perpendicular to the bus bar and end faces, and the vertical components P11 and R11, P21 and R21 face each other. The rotating body is placed in a restrained state from all sides.

  As a result, the rotating body always contacts the side surface of the lower rail at one end surface, and always contacts the side surface of the upper rail at the other end surface. Therefore, the clearance between the both end surfaces of the rotating body and the side surface of the rail Can be completely eliminated, and the absolute stability of the rotating body when a vertical load is applied is ensured. When the upper and lower frames (base and lower table, or lower table and upper table) move relative to each other while bearing a vertical load, the linear motion of the rotating body is secured, and rattling is eliminated.

  When a vertical load is applied, the rotating body always contacts the side of the lower rail at one end face, and always contacts the side of the upper rail at the other end face, so that the rotating body moves straight in each of the upper and lower frames. Therefore, only one of the end faces needs to be guided.

  When a torsional moment acts between the upper frame and the lower frame and horizontal forces Q1 and Q2 act on the upper bus or end face of the rotating body from the upper rail, as shown in FIG. The horizontal reaction force H1, H2 is received from the lower bus bar or the lower frame at the end face. Horizontal forces Q1 and Q2 and horizontal reaction forces H1 and H2 are divided into components perpendicular to the generatrix and the end face, and parallel to each other. Since each vertical component Q11 and H11 and Q21 and H21 face each other, the rotating body is constrained from all sides. Placed in a closed state.

  As a result, the rotating body always contacts the side surface of the lower rail at one end surface, and always contacts the side surface of the upper rail at the other end surface. Therefore, the clearance between the both end surfaces of the rotating body and the side surface of the rail Can be completely eliminated, and the stability of the rotating body when a horizontal load is applied is ensured. The linear motion of the rotating body when the lower frame and the upper frame move relative to each other when a horizontal load is applied is also ensured, and rattling is eliminated.

  Even when a horizontal load is applied, the rotating body always contacts the side of the lower rail at one end face, and always contacts the side of the upper rail at the other end face, so that the rotating body moves straight in each of the upper and lower frames. Therefore, only one of the end faces needs to be guided.

  As described above, since the rotating body is interposed between the upper and lower frames with the shaft inclined with respect to the horizontal, rattling between the vertical load and the horizontal load is eliminated. When the relative movement occurs between the lower table and the upper table, the lower rotating body and the upper rotating body can always move straightly.

  As described above, the lower rotating body and the upper rotating body are held in an inclined state with respect to the horizontal, whereby the lower rotating body and the upper rotating body are restrained in the axial direction only by one end face. Thus, there is no gap between the constrained one end surface and the concave portion of the frame, and the stability of the lower rotating body and the upper rotating body is enhanced against the torsional moment acting between the upper and lower frames.

  Further, when horizontal forces Q1 and Q2 are applied to the upper bus bars or end surfaces of the lower rotating body and the upper rotating body from the upper rail, the lower rail horizontal reaction forces H1 and H2 are applied to the lower bus bars or end surfaces. Thus, the horizontal force is reliably transmitted between the lower table and the base via the lower rotating body and between the upper table and the lower table via the upper rotating body.

  When the lower rotator and the upper rotator move linearly, that is, roll, the greater the inclination angle of the shaft with respect to the horizontal, the greater the reaction force received by the end face, and thus the stability increases. On the other hand, if the inclination angle is increased, the frictional force proportional to the vertical component of the reaction force applied to the end face increases, which causes troubles in smooth rolling, so the inclination angle of the shaft is stable and smooth during rolling. It is decided from both sides. However, if the shaft is slightly inclined with respect to the horizontal, the lower rotating body and the upper rotating body can be stabilized by receiving pressure from four directions, and smooth rolling is ensured. Should be small.

  When relative movement occurs between the upper frame and the lower frame, it is assumed that the center of gravity of the upper frame protrudes out of the plane of the lower frame depending on the amount of movement, and bears a vertical load accordingly. It is envisaged that the upper frame that is being tilted or dropped relative to the lower frame.

  Such a situation can be dealt with by supporting a roller for preventing inclination on the upper and lower frames facing each other as described in claim 5. Even when the upper frame moves to the maximum with respect to the lower frame, the roller prevents the upper frame from tilting by being locked to the other side, thereby preventing the lower frame from dropping or detaching.

The seismic isolation device according to claim 5 is the seismic isolation device according to any one of claims 1 to 4, wherein the base and the lower table face each other, and the lower table and the upper table face each other. , A roller that allows relative movement in the horizontal direction while being locked in a direction in which each other is separated from each other, is pivotally supported,
The support material that supports the roller and the receiving material that the roller locks are formed from a steel plate, and the support material is integrated with either the base body or the lower table body, and the lower table or upper table body. The receiving material is integrated into the other main body of the base and the lower table and the other main body of the lower table and the upper table.

  In claim 5, the ratio of the steel plate to all the components of the seismic isolation device is further increased by forming the support material for supporting the roller and the receiving material to be locked by the roller from one steel plate. The production of the seismic device is further simplified. The support material is integrated directly or indirectly into the main body of either the base or the lower table, and the lower table or the upper table, and the receiving material is the other main body of the base or the lower table, And directly or indirectly integrated with the other main body of the lower table and the upper table.

  When space is secured between the base and the lower table, and between the lower table and the upper table, in addition to the space for storing the rail, the lower rotary body, and the lower rotary body, A spring may be installed between the two. The spring is installed in the direction crossing the relative movement direction between the base and the lower table and between the lower table and the upper table, for example, in the direction orthogonal to the relative movement direction, and independently when relative movement occurs between them. Elongates and exhibits resilience. Both ends of each spring are connected to the base and the lower table, and the lower table and the upper table, respectively.

  In this case, since the lower table is relatively movable only in one horizontal direction with respect to the base, the end of the lower table side of the spring installed between the two is a linear track that is the moving direction when the lower table is relatively moved. Move up. Similarly, since the upper table can move relative to the lower table only in the horizontal direction intersecting the horizontal one direction, the end of the spring on the upper table side is also a linear track that is the moving direction when the upper table is moved relative to the lower table. Move up.

  While the upper table can move relative to the base in any horizontal direction, the movement of the end on the lower table side of the spring installed between the lower table and the base is restricted by linear motion, and the upper table and lower table The movement of the end on the upper table side of the spring installed between them is also restricted to linear motion. For this reason, it is not necessary to install a guide bar, a slider, a pulley, and a wire for the purpose of linearly moving one end of each spring.

  When one end of the spring moves on the linear track, the relationship between the amount of deformation of the spring and the restoring force becomes a sine curve, so that the relative movement of the upper and lower frames can be terminated early. In addition, since the spring is in a use state having no natural frequency, the vibration of the lower table or the upper table is not amplified.

  In a normal state in which the lower table and the upper table do not move relative to the base, the lower spring moves the shaft relative to the lower table so that the lower spring can follow the movement in either direction relative to the base of the lower table. It faces in the intersecting direction such as the direction orthogonal to the moving direction. Similarly, the upper spring is oriented in a crossing direction such as a direction perpendicular to the relative movement direction of the upper table so that the upper table can follow any movement of the upper table relative to the lower table.

  Both the spring between the base and the lower table and the spring between the lower table and the upper table exhibit a restoring force corresponding to the amount of extension, and attempt to return the relatively moved lower and upper tables to their original positions. However, the shaft does not extend with the direction of the shaft kept constant, but the shaft rotates while rotating around one end, so that the lower table and the upper table are returned to the original positions of the lower table and the upper table as described later. The closer the table is to its original position, the smaller the restoring force of the spring will follow the sine curve.

  As a result, the acceleration of the lower table and the upper table is reduced when the lower table and the upper table that are going to return to the original position exceed the original position due to the restoring force of the spring, and further when moving in the opposite direction to the relative movement. Therefore, the lower table and the upper table repeat vibration with a small amplitude with respect to the base near the original position, and then stop.

  Here, the behavior and function of the spring 5 installed between the base 2 and the lower table 3 will be described with reference to FIG. The behavior and function of the spring 6 installed between the lower table 3 and the upper table 4 are the same as those of the spring 5.

  The relative movement direction of the lower table 3 (upper table 4) with respect to the base 2 (lower table 3) is a linear track such as the lower rail 21 (32) and the upper rail 31 (41) in which the lower rotating body 7 (upper rotating body 8) is accommodated. Is regulated in one direction. When the lower table 3 (upper table 4) moves relative to the base 2 (lower table 3), the spring 5 (spring 6) moves the lower table 3 (upper table 4) relative to the base 2 (lower table 3). Elongate depending on. In FIG. 19, the lower rail 21 (32) or the upper rail 31 (41) into which the cylindrical rotating body 7 (8) enters corresponds to the linear track.

  The solid line in FIG. 19 indicates a state in which the lower table 3 does not move relative to the base 2 and the axis of the spring 5 is orthogonal to the relative movement direction of the lower table 3. From this state, as shown by the two-dot chain line, when the spring 5 extends while rotating, the rotation angle made with the original position of the spring 5 is θ (0 ≦ θ ≦ π / 2), and the natural length of the spring 5 is When L and the extension amount of the spring 5 are x, the movement amount X of the lower table 3 is X = (L + x) · sin θ (1). In a state where the lower table 3 does not cause relative movement, the spring 5 does not necessarily have a natural length.

  The spring 5 exhibits a restoring force F (= k · x (k: spring constant)) corresponding to the extension amount x, and the component parallel to the moving direction of the lower table 3 of the restoring force F of the spring 5 is the lower table. 3 is applied to the lower table 3 as a restoring force F1 (= Fsinθ (= k · xsinθ)) (2) for returning 3 to the original position.

  From FIG. 19, since (L + x) cos θ = L, x = (1−cos θ) / cos θ · L (3), and x is expressed by a function of θ. As a result, from (2) and (3), F1 = kL (tan θ−sin θ) (4) In (4), when θ = π / 2, when F1 = ∞, when θ = π / 4, when F1 = 0.29 kL, when θ = 0, F1 = 0, and when θ is close to 90 °, F1 Is extremely large, and as θ approaches 0, F1 decreases rapidly and approaches 0. From this, it can be understood that as the relative movement amount of the lower table 3 increases, the lower table 3 receives a greater restoring force F1 to return to the original position and tries to return to the original position earlier. FIG. 20 shows the relationship between the restoring force F1 of the lower table 3 and the movement amount X of the lower table 3.

  Further, the closer to the original position, the smaller the restoring force F1 received by the lower table 3, so that the lower table 3 receives a force to move further in the direction opposite to the relative movement by the restoring force F1 near the original position. There is no. The smaller the θ is, the smaller the restoring force F1 is, so that F1 = m · a (m is the mass of the lower table 3), and the acceleration a of the lower table 3 is also reduced by drawing a curve similar to F1. FIG. 21 shows the relationship between the acceleration a of the lower table 3 and the movement amount X of the lower table 3.

  Here, if the apparent spring constant of the lower table 3 when the lower table 3 is regarded as a spring is k1, (F1 = k1 · X), 1) and 2), k1 = (1−cos θ) k Thus, the spring constant k1 of the lower table 3 is a function of cos θ. Theoretically, when θ = π / 2, k1 takes the maximum value (k) and becomes the minimum (0) when θ = 0. FIG. 22 shows the relationship between the spring constant k1 of the lower table 3 and the movement amount X of the lower table 3.

The frequency f of the lower table 3 is expressed by f = 1 / 2π (k1 / m) ^1/2 , and the spring constant k1 of the lower table 3 approaches 0 when θ is small, that is, near the original position, and the vibration cycle. Since (1 / f) becomes longer, the lower table 3 vibrates in a long cycle near the original position. FIG. 23 shows the relationship between the frequency f of the lower table 3 and the movement amount X of the lower table 3.

  Thus, when the rotation angle θ of the spring 5 is large (close to π / 2), the restoring force F1 acting on the lower table 3 and the upper table 4 is extremely large, and as θ approaches 0, the restoring force F1 becomes sharper. Becomes smaller. As a result, the lower table 3 and the upper table 4 attempt to return to the original position more rapidly as they move away from the original position. The table 4 tries to converge to the original position at an early stage without repeating vibration.

  Further, since the restoring force F1 directly acts on the lower table 3 and the upper table 4, when the slider is circumscribed on the guide rod as in Patent Document 6, or the wire connected to the slider is stretched via the pulley. There is little loss of force due to frictional force as in the case of. For this reason, the restoring force F1 can be effectively exhibited and transmitted to the lower table 3 and the upper table 4 without loss.

  When the rotation angle θ of the spring 5 is large (close to π / 2), the restoring force F1 acting on the lower table 3 and the upper table 4 is extremely large, and as θ approaches 0, the restoring force F1 decreases rapidly. This is determined by the rotation angle θ formed with the original position of the spring 5 when the spring 5 extends while rotating. For this reason, when the lower table 3 does not move relative to the base 2 as shown in FIG. 19, the axis of the spring 5 does not necessarily have to be orthogonal to the relative movement direction of the lower table 3 on the plane. .

  The restoring force F1 acting on the lower table 3 and the upper table 4 so as to return the lower table 3 and the upper table 4 moved relative to each other to the original position suddenly approaches 0 near the original position. It can be seen that it works to brake the upper table 4. Therefore, there is no need to use a special damper for suppressing vibrations of the lower table 3 and the upper table 4 in the seismic isolation device 1.

  The lower rotating body that supports the lower table so as to be relatively movable in one horizontal direction relative to the base and the upper rotating body that supports the upper table so as to be relatively movable in one horizontal direction relative to the lower table are both cylindrical. Since it is a rotating body (roller), it is possible to immediately cause relative movement without receiving resistance due to friction when vibration of a certain scale or larger is generated in comparison with a sliding bearing.

  In addition, the lower rotating body is in line contact with the base and the lower table, and the upper rotating body is in line contact with the lower table and the upper table, respectively, so that the burden load per unit is reduced in comparison with the point-contacting sphere, which is necessary for support. Numbers can be saved. In addition, the pressure on the base and the lower table where the lower rotator contacts and the lower table and upper table where the upper rotator contacts decreases. It is possible to reduce the thickness and suppress the overall (height) of the seismic isolation device.

  By constructing all three frames, which are the main components of the seismic isolation device, from steel plates, the structure of the frame itself is simplified compared to assembling the frame from steel. Can be reduced in weight. In addition, since the seismic isolation device can be manufactured by combining steel plates, it is possible to unify the components, so that the seismic isolation device can be standardized, the cost required for production can be reduced, and the production efficiency can be improved. Can do.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.

  FIG. 1 shows a base 2, a lower table 3 supported on the base 2 so as to be relatively movable in one horizontal direction with respect to the base 2, and a horizontal direction on the lower table 3 with respect to the lower table 3. A specific example of a linear motion type seismic isolation device (hereinafter referred to as a seismic isolation device) 1 of a type in which an upper table 4 supported so as to be relatively movable in a horizontal direction intersecting with each other is shown. This seismic isolation device 1 mainly targets building structures such as medium- and low-rise houses, or civil engineering structures such as bridges, but reduces vibrations to light-weight structures such as exhibits in museums. Used as a seismic isolation device.

  2 shows the plane of FIG. 1, FIG. 3 shows the elevation of line AA in FIG. 2, and FIG. 4 shows the elevation of line BB in FIG. FIG. 5 is a partially enlarged view of a portion between the lower table 3 and the upper table 4 of FIG. In order to increase the production efficiency of the seismic isolation device 1, the main body of the base 2, the lower table 3, and the upper table 4 is basically formed by bending a single steel plate. The seismic isolation device 1 may be manufactured by combining the steel materials. The main body such as the base 2 refers to a part excluding the below-described lower rotating body 7 and upper rotating body 8, and the lower rails 21 and 32 and the upper rails 31 and 41 among the constituent elements of the seismic isolation device 1.

  Between the base 2 and the lower table 3, a cylindrical lower rotating body 7 that supports the lower table 3 so as to be relatively movable in one horizontal direction is interposed, and between the lower table 3 and the upper table 4, the upper table 4. A cylindrical upper rotating body 8 is interposed between the upper rotating body 8 and the horizontal rotating direction so as to be relatively movable in a horizontal direction intersecting the one direction. Both the axis of the lower rotating body 7 and the axis of the upper rotating body 8 are inclined with respect to the horizontal.

  As shown in FIG. 16, the seismic isolation device 1 is installed horizontally between the lower structure and the upper structure that are structurally separated, and when the upper structure attempts to move relative to the lower structure, the lower table 3. Moves relative to the base 2 and the upper table 4 moves relative to the lower table 3 to allow relative movement of the upper structure. Specifically, the seismic isolation device 1 is divided into upper and lower parts in general structures such as between the superstructure of the base isolation building and the foundation, between the bridge girder and pier, between the base isolation floor and the frame floor. It is installed between the upper structure and the lower structure. The base 2 is fixed to a horizontal plane including the upper surfaces of foundations, piers, frame floors and other substructures.

  The base 2 and the main body of the upper table 4 which are constituent elements of the seismic isolation device 1 are box-shaped so as to secure a space in a portion other than both sides by bending both sides in the length direction or width direction of the steel plate. It is formed. The bent side portions are used for connecting or arranging components and members such as the lower rotating body 7 and the upper rotating body 8 housed in the space.

  As shown in FIG. 1 and the like, when the base 2 and the upper table 4 which are positioned above and below the three-layer structure are formed from a single steel plate, the lower table 3 of the intermediate layer has the base 2 and the upper portion as shown in FIG. Two steel plates identical to the steel plate constituting the table 4 are joined back to back.

  Accordingly, the base 2 and the upper table 4 are molded by bending a single steel plate, and the lower rails 21 and 32 and the upper rail 31 on which the lower rotary body 7 and the upper rotary body 8 roll. If a steel plate unit is manufactured in a form in which 41 and 41 are integrated, the steel plate unit is used as it is as the base 2 and the upper table 4. Further, two steel plate units are overlapped and joined together to form the lower table 3 as it is. In this case, the forms of the base 2 and the upper table 4 are the same. The steel plates of the steel plate unit are joined to each other by bolts or welding. FIGS. 1-9 has shown the case where the base 2, the upper table 4, and the lower table 3 were formed from this steel plate unit.

  In the space between the base 2 and the lower table 3 and between the lower table 3 and the upper table 4, parts and members such as the lower rotating body 7 and the upper rotating body 8 and the lower rails 21 and 32 and the upper rails 31 and 41 are stored. In this state, when there is room in the space, as shown in FIGS. It is installed in the direction that intersects

  In this case, spring receivers 23 and 35 for connecting the ends of the spring 5 are fixed to the opposing surfaces of the base 2 and the lower table 3. Similarly, spring receivers 36 and 43 for connecting ends of the spring 6 are fixed to the opposing surfaces of the lower table 3 and the upper table 4. The spring 5 is installed between the spring receiver 23 of the base 2 and the spring receiver 35 of the lower table 3 and between the spring receiver 36 of the lower table 3 and the spring receiver 43 of the upper table 4.

  The spring 5 installed between the base 2 and the lower table 3 gives the same restoring force to the lower table 3 even if the lower table 3 moves relative to the base 2 in a normal state where no vibration is generated. In addition, the shaft is installed on a plane in a direction perpendicular to the relative movement direction of the base 2 and the lower table 3. When relative movement occurs between the base 2 and the lower table 3, the spring 5 expands while rotating around a connection point to the base 2 and exhibits a restoring force.

  The spring 6 laid between the lower table 3 and the upper table 4 is also laid on a flat surface in a normal state and in a direction perpendicular to the relative movement direction of the lower table 3 and the upper table 4. When a relative movement occurs between the four, it expands while rotating around the connection point to the lower table 3 and exhibits a restoring force. In the drawing, the lower table 3 moves relative to the base 2, the upper table 4 moves relative to the lower table 3, and the springs 5 and 6 follow these relative movements.

  The springs 5 and 6 are mainly coil springs having a high deformability, but a part of the springs 5 and 6 is a series of springs, such as disc springs and ring springs, that generate a damping force due to friction when contracted. In addition, or by combining them in parallel, the damping force of the disc spring or the ring spring can be applied to the springs 5 and 6, and the function of the damper can be added.

  As shown in FIG. 3 showing the fit between the base 2 and the lower table 3, the lower rotating body 7 is arranged in two rows in a direction orthogonal to the rolling direction, and a plurality of rows are arranged in the rolling direction for each row. Thus, the rotating body group 70 is configured. The two rows of rotating body groups 70 behave as a unit of the lower rotating body 7 as a set. The axis | shafts of the rotary body groups 70 and 70 of each row | line | column of the lower rotary body 7 mutually cross | intersect so that it may roll on a rail stably in use condition. The two rows of rotating body groups 70 as one unit roll in an orderly manner by the guide plate 9 having the openings 9a corresponding to the number of the lower rotating bodies 7.

  As shown in FIG. 4 showing the fit between the lower table 3 and the upper table 4, the upper rotating body 8 is also arranged in two rows in a direction orthogonal to the rolling direction, and a plurality of rows are arranged in the rolling direction for each row. Thus, the rotating body group 80 is configured. The two rows of rotating body groups 80 form a set and behave as a unit of the upper rotating body 8. The axes of the rotating body groups 80 and 80 in each row of the upper rotating body 8 also intersect each other so as to stably roll on the rail in use. The two rows of rotating body groups 80 as one unit rolls in an orderly manner by the guide plate 10 having the openings 10 a corresponding to the number of the upper rotating bodies 8. The guide plate 9 and the guide plate 10 are also manufactured by bending and deforming a single steel plate punched through the openings 9a and 10a.

  3 to 5, the rotating body group 70 is sandwiched between the lower rail 21 and the upper rail 31, and the rotating body group 80 is sandwiched between the lower rail 32 and the upper rail 41, respectively. Moreover, since the to-be-latched material 11 and 11 is located in the axial direction both sides of each rotary body group 70 and 80, the guide plates 9 and 10 are bent so that it may not interfere with these. 6 and 7 show a state in which two rows of rotating body groups 80 and 80 are held by one guide plate 10, the rotating body group 70 or the rotating body group 80 has three rows in the axial direction. They may be arranged as described above.

  Each lower rotating body 7 constituting one unit from the two rows of rotating body groups 70 enters the opening 9a of the guide plate 9, and both end faces come into contact with the inner peripheral surface of the opening 9a. Restrained against movement. Similarly, the upper rotating body 8 constituting one unit from the two rows of rotating body groups 80 enters the opening 10a of the guide plate 10, and both end faces come into contact with the inner peripheral surface of the opening 10a, so that the axial direction during rolling is increased. Restrained against movement. When the end faces of the lower rotating body 7 and the upper rotating body 8 that are directed downward with respect to the horizontal are engaged with the openings 9a and 10a, the lower rotating body 7 and the upper rotating body 8 are constrained by the lowering when rolling and are directed upward with respect to the horizontal. When the end face is locked to the openings 9a and 10a, the end face is restrained against lifting during rolling.

  As described above, FIGS. 1 to 4 show the seismic isolation device 1 in which the base 2, the lower table 3, and the upper table 4 are composed of a unified steel plate unit whose main body is a single steel plate. 6-9 shows the single body of the lower table 3 which is an intermediate | middle layer among the seismic isolation apparatuses 1 shown in FIGS. 1-4.

  In this case, the steel plate unit includes lower support members 22, 34 and upper support members 33, 42, which will be described later, and lower rails 21, 32, upper rails 31, 41, and other parts, on the steel plate constituting the main body of the frame such as the base 2. Manufactured in a joined form. As described above, the steel plate unit is used as it is as the base 2 and the upper table 4, and the lower table 3 is manufactured by joining the steel plates of the two steel plate units back to back as shown in FIG. The lower table 3 is formed from two steel plates. Joining is by bolts or welding.

  If the radius of the lower rotator 7 is r, one rotation will advance 2πr with respect to the base 2, and the lower table 3 will advance 2πr with respect to the lower rotator 7 at that time. Meanwhile, the lower table 3 advances 4πr relative to the base 2. Similarly, if the radius of the upper rotating body 8 is R, the upper table 4 advances 4πR relative to the lower table 3 while the upper rotating body 8 makes one rotation. Although the drawing shows the case where the radius r of the lower rotating body 7 and the radius R of the upper rotating body 8 are equal, they may be different.

  Since the upper table 4 moves with respect to the lower table 3 twice as much as the amount of movement of the upper rotating body 8, the upper table 4 can move in any direction with respect to the lower table 3 in the normal state. It is arranged at the center of the relative movement direction. Similarly, the rotating body group 70 is arranged on the base 2 at the center in the relative movement direction of the lower table 3 in the normal state. FIG. 6 shows a state where the rotating body group 80 is shifted to one side of the lower table 3 in the relative movement direction of the upper table 4 and the guide plate 10 is locked to the stopper 15 on the lower rail 32. FIG. 6 shows a state in which the upper table 4 has moved to the maximum with respect to the lower table 3.

  As shown in FIG. 3, the lower rail 21 and the upper rail 31 are fixed to the opposing surfaces of the base 2 and the lower table 3, respectively. Similarly, as shown in FIG. 4 and FIG. 5, the lower rail 32 and the upper rail are simultaneously in contact with the opposing surfaces of the lower table 3 and the upper table 4, respectively. 41 is fixed. In the drawing, the base 2, the lower table 3, and the main body of the upper table 4 are formed from a single steel plate, so that the lower rail 21 and the upper rail 31, and the lower rail 32 and the upper rail 41 are also a single steel plate. Is formed by bending and bonded to the main body such as the base 2. Joining is by bolts or welding.

  In the drawing, in order to avoid a situation in which stress concentrates on the steel plates constituting the base 2 and the like from both ends of the steel plates constituting the lower rail 21 and the upper rail 31, and the lower rail 32 and the upper rail 41, the base 2 The lower support members 22 and 34 and the upper support members 33 and 42 are interposed between the lower support members 22 and 34, and the lower rails 21 and 32 are joined to the lower support members 22 and 34. Upper rails 31 and 41 are joined.

  The lower support members 22 and 34 and the upper support members 33 and 42 have a function of reinforcing the base 2, the lower table 3, and the upper table 4, and support the lower roller 12 and the upper roller 13 described later or The lower roller 12 and the upper roller 13 are used for rolling. The lower rail 21 may be directly joined to the base 2, the upper rail 31 and the lower rail 32 may be joined directly to the lower table 3, and the upper rail 41 may be joined directly to the upper table 4, respectively.

  In the drawing, in order to restrain the deformation of the lower rail 21 and the upper rail 31 due to the existence of a gap between the lower rail 21 and the lower support member 22 and between the upper rail 31 and the upper support member 33, In these gaps, reinforcing members 212 and 312 in the form of bent steel plates are placed. Similarly, in order to restrain the deformation of the lower rail 32 and the upper rail 41 due to the presence of a gap between the lower rail 32 and the lower support member 34 and between the upper rail 41 and the upper support member 42, a steel plate is used. Bent reinforcing members 322 and 412 are inserted.

  As described above, the lower rotating body 7 and the upper rotating body 8 enter the openings 9a and 10a of the guide plates 9 and 10 to obtain axial stability during rolling. As shown in FIGS. 3 to 5, in order to improve the stability of the rotating body groups 70, 80, the to-be-locked material 11 whose end faces are locked at both side positions of the rotating body groups 70, 80 is fixed. The to-be-latched material 11 is fixed to a position where both end surfaces of the rotating body groups 70 and 80 of the lower rails 21 and 32 and the upper rails 31 and 41 are latched.

  Since the seismic isolation device 1 shown in FIGS. 1 to 5 is vertically symmetric, the locked member 11 is fixed to the lower rail 21 of the base 2 and the upper rail 41 of the upper table 4 at the center in the width direction. The locked material 11 is fixed to the upper rail 31 on the lower surface of the lower table 3 and the lower rail 32 on the upper surface on both sides in the width direction. The locked material 11 can also be formed by bending both sides of the lower rails 21 and 32 or the upper rails 31 and 41 in the width direction.

  The locked member 11 of the lower rail 21 on the upper surface of the base 2 fixed to the axially intermediate position of the two rows of rotating body groups 70, 70 is also located on the upper surface of the upper table 4 in the vertically symmetrical position. It is located in the middle of the 80 axial direction. The locked material 11 is locked between the base 2 and the lower table 3 on the end surface facing the lower side of the rotating body group 70, and between the lower table 3 and the upper table 4, it faces the upper side of the rotating body group 80. Lock to the end face.

  The locked member 11 of the upper rail 31 on the lower surface of the lower table 3 fixed to the axially opposite side positions of the two rows of rotating body groups 70, 70 is also located on the upper surface of the lower table 3 in the vertically symmetrical position. 80 on both sides. This locked material 11 is locked between the base 2 and the lower table 3 on the end surface facing upward of the rotating body group 70, and between the lower table 3 and the upper table 4 facing downward of the rotating body group 80. Lock to the end face.

  The locked member 11 functions to restrain the movement in the axial direction by being locked to the end faces on both sides in the axial direction of the rotating body group 70 or the rotating body group 80, but the rotating body group adjacent in the axial direction. When the openings 9a and 10a of the guide plates 9 and 10 are locked to the opposing end faces of the plates 70 and 80, respectively, the axial movement of the rotating body groups 70 and 80 can be restricted. It is not necessary to fix.

  Spacers 211 and 321 for positioning the lower rails 21 and 32 in the width direction with respect to the lower support materials 22 and 34 are fixed or connected to the lower support materials 22 and 34 on both sides in the width direction of the lower rails 21 and 32. Is done. Similarly, spacers 311 and 411 for positioning the upper rails 31 and 41 in the width direction with respect to the upper support members 33 and 42 are fixed to the upper support members 33 and 42 on both sides in the width direction of the upper rails 31 and 41, Or connected.

  A lower roller 12 that allows relative movement in the horizontal direction is supported on one side of the opposing surfaces of the base 2 and the lower table 3 while being locked in a direction in which the opposing other sides are separated from each other. Similarly, an upper roller 13 that allows relative movement in the horizontal direction is supported on one side of the opposing surfaces of the lower table 3 and the upper table 4 while being locked in a direction in which the other opposing sides are separated from each other. The The direction of separation refers to the upward direction.

  In the drawing, for ease of processing of the lower support member 22 and the upper support member 33 joined to the opposing surfaces of the base 2 and the lower table 3, the both sides in the width direction of the lower support member 22 and the upper support member 33 are bent, The lower roller 12 is pivotally supported by using a bent portion of the upper support member 33. Further, the bent portion of the lower support member 22 is used as a receiving member 22a on which the lower roller 12 rolls. In this case, the lower support member 22 also serves as the receiving member 22a.

  Similarly, as shown in FIGS. 4 and 5, the upper roller 13 is pivotally supported at the bent portions on both sides in the width direction of the lower support member 34 on the upper surface of the lower table 3, and A receiving member 42a on which the upper roller 13 rolls is formed at the bent portion. Here, the upper support member 42 also serves as the receiving member 42a.

  Contrary to the drawing, the lower roller 12 and the upper roller 13 are pivotally supported by the lower support member 22 of the base 2 and the upper support member 42 of the upper table 4, respectively, and the upper support member 33 on the lower surface of the lower table 3 and the lower support member of the upper surface are supported. A receiving material may be formed on each material 34.

  When the lower roller 12 is pivotally supported by the lower table 3 as shown in the figure, even when the relative movement amount of the lower table 3 with respect to the base 2 reaches the maximum, the lower roller 12 is locked to the base 2 at a plurality of locations. In order to prevent the tilting and detachment of the base plate 3, a plurality of base plates 2 and the lower table 3 are arranged at intervals in the relative movement direction.

  The upper roller 13 is also locked to the upper table 4 at a plurality of positions even when the relative movement amount of the upper table 4 with respect to the lower table 3 reaches the maximum, so that the upper table 4 is prevented from being inclined or detached. A plurality of the upper table 4 and the upper table 4 are arranged at intervals in the relative movement direction.

  Between the base 2 and the lower table 3, one set or a plurality of sets of two rows of rotating body groups 70 as a unit are arranged together with the guide plate 9, and also between the lower table 3 and the upper table 4. One set or a plurality of sets of two rows of rotating body groups 80 as one unit are arranged together with the guide plate 10. In the drawing, two sets of two rows of rotating body groups 70, 70 as one unit are arranged in a direction perpendicular to the relative movement direction of the lower table 3, and two rows of rotating body groups 80, 80 as one unit are arranged in the upper table. Although two sets are arranged in the direction orthogonal to the relative movement direction of 4, there are cases where three or more sets are arranged together.

  If a plurality of sets of rotating body groups 70 and 80 of one unit are arranged in a direction orthogonal to the relative movement direction of the lower table 3 and the upper table 4, stability during the relative movement of the lower table 3 and the upper table 4 is improved. However, depending on the scale of the seismic isolation device 1, there may be a case where a single set of rotating body groups 70 and 80 may be arranged.

  As shown in FIGS. 1 to 5, the lengthwise ends of the lower rail 21 of the base 2 and the upper rail 31 on the lower surface of the lower table 3 are for limiting the relative movement amount of the lower table 3 with respect to the base 2. The stopper 14 is pivotally supported or fixed. When the lower rotating body 7 or the guide plate 9 is locked to the stopper 14, rolling of the lower rotating body 7 that rolls between the lower rail 21 and the upper rail 31 is restricted, and the lower table 3 is prevented from falling. .

  Similarly, stoppers 15 for restricting the amount of relative movement of the upper table 4 with respect to the lower table 3 are pivotally supported at the lengthwise ends of the lower rail 32 on the upper surface of the lower table 3 and the upper rail 41 of the upper table 4. Or fixed etc. When the upper rotating body 8 or the guide plate 10 is locked to the stopper 15, rolling of the upper rotating body 8 that rolls between the lower rail 32 and the upper rail 41 is limited, and the upper table 4 is prevented from falling. .

  10 to 15 show a case where one unit of the rotating body groups 70 and 70 is arranged in parallel in a direction perpendicular to the relative movement direction, attached to one side of the center line in the relative movement direction with respect to the base 2 of the lower table 3. . Here, one unit of the rotating body groups 80 and 80 is arranged in parallel in a direction perpendicular to the relative movement direction, attached to one side of the center line in the relative movement direction of the upper table 4 with respect to the lower table 3. In this case, since the rotating body groups 70 and 80 of each unit are arranged in parallel, the seismic isolation device 1 has an advantage of increasing the load capacity of the vertical load.

  In this case, the lower rails 21 and 32 and the upper rails 31 and 41 on which the rotating body groups 70 and 80 roll correspond to the number of the rotating body groups 70 and 80 and are arranged in parallel. 1 lower support for the two rows of lower rails 21 and 32 and upper rails 31 and 41 so that they fit within a limited space between the lower table 3 and the upper table 4. The materials 22 and 34 and the upper support materials 33 and 42 are used.

  Since the seismic isolation device 1 shown in FIGS. 10 to 15 has particularly high load bearing performance, the seismic isolation device 1 is not made vertically symmetrical as shown in FIGS. Two rows of rotating body groups 70 and 70 and two rows of rotating body groups 80 and 80 of the upper rotating body 8 are arranged in a reverse C shape. Accordingly, the lower support members 22 and 34 respectively surround the upper support members 33 and 42 from both sides in the width direction.

  By arranging the two rows of rotating body groups 70 and 70 in an inverted C shape, each of the two rows of rotating body groups 70 and 70 is held by one lower rail 21 of the base 2 from both sides in the axial direction. Become a shape. Further, the two rows of rotating body groups 80 and 80 are arranged in an inverted C shape, so that each of the two rows of rotating body groups 80 and 80 is also held by the lower rail 32 of the lower table 3 from both sides in the axial direction. become. As a result, each of the two rows of rotating body groups 70, 80 has high stability against coming out of the lower rails 21, 32.

  When the springs 5 and 6 cannot be arranged between the base 2 and the lower table 3 and between the lower table 3 and the upper table 4 as in the seismic isolation device 1 shown in FIGS. When it is more convenient not to arrange, the seismic isolation device 1 is used in combination with an external spring unit 16 as shown in FIG.

  Since the seismic isolation device 1 shown in FIGS. 10 to 15 has a particularly high load bearing capacity, it is used for heavy structures with high publicity such as railway generators and bridges in addition to houses. As shown in FIG. 16, the seismic isolation device 1 is installed between the upper structure and the lower structure as described above. The spring unit 16 is installed between the upper structure and the lower structure separately from the seismic isolation device 1. The

It is the perspective view which showed the structural example of the seismic isolation apparatus. It is a top view of FIG. FIG. 3 is an elevational view taken along line AA in FIG. 2. FIG. 3 is an elevational view taken along line BB in FIG. 2. FIG. 5 is a partially enlarged view of FIG. 4. It is the perspective view which showed the lower table which comprises the seismic isolation apparatus shown in FIG. FIG. 7 is a plan view of FIG. 6. FIG. 8 is an elevational view taken along line AA in FIG. 7. FIG. 8 is an elevational view taken along line BB in FIG. 7. It is the perspective view which showed the structural example of the other seismic isolation apparatus. It is a top view of FIG. It is an elevational view of the AA line of FIG. FIG. 12 is an elevational view taken along line BB in FIG. 11. FIG. 14 is a partially enlarged view of FIG. 13. It is the perspective view which showed the lower table which comprises the seismic isolation apparatus shown in FIG. It is the schematic which showed the example of installation of the seismic isolation apparatus shown in FIG. (A) is an elevation showing the relationship between the force applied to the bus bar and the end face when the lower rotating body or the upper rotating body bears a vertical load, and (b) is the lower rotating body or the upper rotating body. FIG. 5 is an elevational view showing the relationship between the force applied to the bus bar and the end face when a horizontal load is borne. (A) is an elevation view showing a state in which rollers are arranged between the upper and lower frames with the axis oriented horizontally, (b) is a plan view of (a), and (c) is an irregularly inclined roller axis. It is the top view which showed the mode which did. It is the top view which showed the relationship between the expansion | extension accompanying rotation of a spring, and a lower table. It is the graph which showed the relationship between the restoring force of a lower table, and horizontal displacement when a lower table is considered as a spring. It is the graph which showed the relationship between the acceleration of a lower table, and horizontal displacement. It is the graph which showed the relationship between the spring constant of a lower table, and horizontal displacement. It is the graph which showed the relationship between the natural frequency of a lower table, and horizontal displacement.

Explanation of symbols

1 ... Seismic isolation device 2 ... Base,
21 …… Lower rail, 211 …… Spacer, 212 …… Reinforcing material,
22: Lower support material, 22a: Receiving material,
23 …… Spring holder,
3 ... Lower table,
31 …… Upper rail, 311 …… Spacer, 312 …… Reinforcing material,
32 …… Lower rail, 321 …… Spacer, 322 …… Reinforcing material,
33 …… Upper support material,
34 …… Lower support material,
35 …… Spring holder,
36 …… Spring holder,
4 ... the upper table,
41 …… Upper rail, 411 …… Spacer, 412 …… Reinforcing material,
42 …… Upper support material, 42a …… Reception material,
43 …… Spring holder,
5 ... Spring,
6 ... Spring,
7 ......... Rotating body, 70 ... Rotating body group,
8 ... upper rotating body, 80 ... rotating body group,
9 ......... Guide plate, 9a ... Opening,
10: guide plate, 10a: opening,
11 …… Locked material,
12 …… Lower roller,
13 …… Upper roller,
14 …… Stopper,
15 …… Stopper,
16 …… Spring unit

Claims (6)

A base, a lower table supported on the base so as to be movable relative to the base in one horizontal direction, and a lower table supported on the lower table so as to be relatively movable in a horizontal direction intersecting the one direction with respect to the lower table. A supported upper table,
A cylindrical lower rotating body that is interposed between the base and the lower table and supports the lower table so as to be relatively movable in the horizontal direction;
And a columnar upper rotating body that is interposed between the lower table and the upper table and supports the upper table so as to be relatively movable in the horizontal direction intersecting the one direction. In the seismic device,
A linear motion type seismic isolation device, wherein the base, the lower table, and the main body of the upper table are formed by bending a steel plate.   The base and the main body of the upper table are formed in the same shape from one steel plate, and the lower table is formed by joining the base or the two steel plates constituting the main body of the upper table back to back. The linear motion type seismic isolation device according to claim 1. The lower rotating body and the upper rotating body are arranged in two rows in a direction orthogonal to the rolling direction, with the axes crossing each other, and a plurality of rows are arranged in the rolling direction for each row. Configure the rotating body group,
Rails in which the pair and two rows of rotating bodies simultaneously contact each other on the opposing surfaces of the base and the lower table and the opposing surfaces of the lower table and the upper table. Formed or fixed,
The rails with which the two rows of rotating bodies contact simultaneously are formed from a steel plate, and are fixed to the opposing surfaces of the base and the lower table, and the opposing surfaces of the lower table and the upper table, respectively. The linear motion type seismic isolation device according to claim 1, wherein   A plurality of sets of the lower rotating body, in which two groups of rotating bodies are arranged in parallel with each other, are arranged between the base and the lower table, and the upper rotating body, in which the groups of rotating bodies are arranged in two rows in parallel with each other, The linear motion type seismic isolation device according to claim 3, wherein a plurality of sets are arranged between the lower table and the upper table. While either one of the opposing surfaces of the base and the lower table and one of the opposing surfaces of the lower table and the upper table are locked in a direction in which the other is separated from each other, A roller that allows relative movement is pivotally supported,
A support material that pivotally supports the roller and a receiving material that the roller locks are formed from a steel plate, and the support material is formed of one of the main body of the base and the lower table, and the lower table and the upper table. One of the main bodies is integrated, and the receiving material is integrated with the other main body of the base and the lower table, and the other main body of the lower table and the upper table. The linear motion type seismic isolation device according to any one of claims 1 to 4. It is installed between the base and the lower table, and between the lower table and the upper table in a direction crossing the relative movement directions, and expands and exhibits a restoring force when relative movement occurs between them. The linear motion type seismic isolation device according to claim 1, further comprising a spring.

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