JP2005061565A - Laminated rubber support - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To control the action of tensile force on a laminated rubber in accompany with floating while securing the sufficient floating allowance and the resistance force to the floating of an upper structure in a laminated rubber support used in a structure on which the tensile force is axially acted, or a specific part in the structure. <P>SOLUTION: In this laminated rubber support 1 composed of the laminated rubber 2 and flanges 3, 4 integrated with upper and lower parts of the laminated rubber, the flexural rigidity of a part 3a (4a) excluding a part directly or indirectly overlapped to the laminated rubber 2, of at least one of the upper and lower flanges 3, 4, is determined to generate out-of-plane bending deformation by the axial tensile force smaller than the axial tensile force of a degree damaging the laminated rubber 2. At least one of the flanges 4 is divided into a central part 41 directly or indirectly overlapped to the laminated rubber 2 and joining the laminated rubber 2, and a peripheral part 42 located at the periphery of the central part 41 and relatively thinner than the central part 41, and the central part 41 and the peripheral part 42 are separatably joined each other. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a structure in which a tensile force can act in the axial direction and a laminated rubber bearing used in a specific part in the structure.

  Laminated rubber, which is most commonly used as a seismic isolation device for buildings and bridges, exhibits high strength against axial compressive force, but has extremely low strength against tensile force, so it is integrated with laminated rubber. The laminated rubber bearing including the flange is designed so as not to generate a tensile force on the laminated rubber, that is, the variable axial force due to an earthquake or the like does not exceed the normal long-term vertical axial force.

  However, because of the large tower ratio (the ratio of the height to the width of the building) or due to the planar shape of the building itself, the building will generate a large tensile force in the vertical direction due to the horizontal vibration of the building. In addition to the laminated rubber used, laminated rubber installed immediately below the multi-layer earthquake resistant wall inevitably generates an excessive tensile force in the axial direction, which may damage the laminated rubber, such as breaking.

  In such a case, by providing a gap of about several tens of millimeters between the head of the bolt that joins the upper flange of the laminated rubber bearing to the upper base plate fixed to the lower surface of the upper structure and the lower surface of the upper flange. There is a method that allows the upper structure to lift up the gap and does not apply a tensile force to the laminated rubber (see Non-Patent Document 1). In this case, a groove is formed on the lower surface of the upper base plate so that the upper flange and the upper base plate are horizontally locked even when the gap is lifted, and shear force is transmitted between the two. The upper flange is inserted.

In addition, the laminated rubber constituting the seismic isolation device is separated into upper and lower parts, steel plates are joined to the end faces of both separated laminated rubbers, and a shear key is horizontally interposed between the two steel plates. A method in which a horizontal force is transmitted between separated laminated rubbers by not joining them, and a displacement in a direction in which the separated laminated rubbers are separated from each other is allowed, and a tensile force is not applied to the laminated rubber (see Patent Document 1), flange A method in which the thickness of the portion other than the portion overlapping the laminated rubber is made smaller than the thickness of the portion overlapping the laminated rubber, and the deformation is concentrated on the portion other than the portion overlapping the laminated rubber so that the tensile force is not applied to the laminated rubber. (See Patent Document 2).
"MENSHIN NO. 38 2002/11", Japan Seismic Isolation Structure Association, November 2002, No. 38, p. 12-13 Japanese Patent Laid-Open No. 10-317715 JP 2002-195327 A

  The method of Non-Patent Document 1 only allows the lifting of the upper structure of about several tens of millimeters. If the lifting exceeds the allowable amount, the upper flange comes into contact with the upper base plate, and then the laminated rubber is used instead. Therefore, since there is no element that can resist the tensile force, an axial tensile force is applied to the laminated rubber, and the laminated rubber is damaged.

  Increasing the lift allowance increases the thickness of the upper base plate and upper flange and requires longer bolts, but also increases the height of the space between the lower structure and the upper structure. If there is not enough room, the seismic isolation device cannot be installed, and the amount of protrusion of the bolt from the lower surface of the upper flange also increases, so there is a high possibility that the laminated rubber will collide with the bolt during shear deformation of the laminated rubber. Become.

  Since the method of Patent Document 1 allows the upper structure to lift up within a range in which the state where the steel plate and the shear key are locked can be maintained, if the lift exceeds the amount that the steel plate and the shear key can be locked, the shear key is detached from the steel plate. The laminated rubber cannot function.

  In addition, since steel plates and shear keys cannot resist the tensile force at the time of lifting, in order to cause shear deformation in laminated rubber separated vertically when an axial tensile force acts on the seismic isolation device, It is necessary to maintain the state where the shear key is always locked, and if it is intended to increase the allowable floating amount, it is necessary to increase the height of the shear key as in Non-Patent Document 1, so the lower structure and the upper structure If the space between them is not high enough, it cannot be installed.

  In the method of Patent Document 2, since the flange consisting of a portion other than the portion overlapping the laminated rubber and the portion overlapping the laminated rubber is a continuous plate, when bending deformation occurs in the thin portion as the upper structure is lifted In addition, there is a possibility that the portion overlapping the laminated rubber may also be deformed. In addition, since the horizontal force generated in the laminated rubber body must be transmitted safely, there is a limit to making the flange thin, and with this limit, a significant improvement in tensile deformation capacity cannot be expected.

  In view of the above background, the present invention proposes a laminated rubber bearing that suppresses the action of a tensile force on the laminated rubber that accompanies the lifting while ensuring a sufficient allowance for lifting of the superstructure and a resistance to lifting.

  In the invention according to claim 1, in the laminated rubber bearing comprising the laminated rubber and the flange integrated with the upper and lower parts and joined to the upper structure and the lower structure, the laminated rubber of at least one of the upper and lower flanges By making the flexural rigidity of the part other than the part directly or indirectly overlapping with the upper part by making the bending rigidity small enough to cause out-of-plane bending deformation by the axial tensile force that is smaller than the axial tensile force that damages the laminated rubber, While securing a sufficient lifting allowance of the structure and resistance to lifting, the action of tensile force on the laminated rubber accompanying lifting is suppressed.

  The bending rigidity of the portion of the flange other than the portion overlapping the laminated rubber is a size that can cause an out-of-plane bending deformation by an axial tensile force that is smaller than the axial tensile force that damages the laminated rubber. 1- (a), as shown in FIG. 2, the distance from the circumferential surface of the laminated rubber to the bolt for fixing the flange to the upper structure or the lower structure is about half or more the width of the portion overlapping the laminated rubber. Or, the flange itself is not a circle or square, but has a concave polygonal shape such as a cross, and the part of the flange other than the part overlapping the laminated rubber is located at the center of the flange. This means that the out-of-plane rigidity is smaller than the out-of-plane rigidity of the portion overlapping with the laminated rubber, and the deformation concentrates on the portion other than the portion overlapping with the laminated rubber in the out-of-plane direction.

It is limited that the bending rigidity of the flange other than the portion overlapping with the laminated rubber is such that it can cause out-of-plane bending deformation by an axial tensile force that is smaller than the axial tensile force that would damage the laminated rubber. In other words, it can be said that a tensile deformation exceeding the tensile axial deformation of the laminated rubber caused by the axial tensile force to the extent that the laminated rubber is damaged or yielded occurs in the flange. The axial tensile force referred to here varies depending on the material of the rubber, but the tensile surface pressure divided by the cross-sectional area of the rubber is about 1.0 N / mm ² .

  In addition, the distance from the laminated rubber peripheral surface to the bolt that is set to reduce the bending rigidity of the flange other than the portion overlapping the laminated rubber as described above is not necessarily directly related to the diameter of the laminated rubber. However, since it is determined by the degree of tensile deformation capacity required for the design of the laminated rubber itself, it is sufficient that 300 mm or more is secured regardless of the diameter of the laminated rubber. As will be described later, for example, when the diameter of the laminated rubber is 1500 mm, it is set to 500 to 1000 mm.

  Therefore, the distance from the circumferential surface of the laminated rubber to the bolt is about half or more of the width of the portion overlapping the laminated rubber, and about half of the distance is 300 mm regardless of the diameter of the laminated rubber. From the laminated rubber peripheral surface, the bending rigidity of the portion other than the portion overlapping with the rubber is a magnitude that can cause an out-of-plane bending deformation by an axial tensile force that is smaller than an axial tensile force that damages the laminated rubber. In other words, the shortest plane distance to the bolt for fixing the flange to the upper structure or lower structure is 300 mm or more.

  In addition to the shearing force borne by the laminated rubber and the bending moment accompanying the shear deformation of the laminated rubber, the flange transmits the axial tensile force accompanying the lifting of the superstructure between the superstructure and the substructure to which it is joined. Therefore, when the distance from the circumferential surface of the laminated rubber to the bolt is about half the width of the portion overlapping the laminated rubber, or between the superstructure where the flange is located and the laminated rubber The shearing force is transmitted between the rubber and the substructure, and the bending moment and the axial tensile force can be borne while bending deformation is performed.

  The deformation capacity of the flange with reduced out-of-plane rigidity increases as the distance from the circumferential surface of the laminated rubber to the bolt increases, and increases as the wall thickness decreases.However, if the thickness is reduced, out-of-plane buckling is likely to occur. The result is that the shear restoring force characteristic is hindered, and a necessary function such as transmission of the shear force between the upper structure and the lower structure cannot be performed.

  Therefore, in order to increase the deformation capability while maintaining the function of the flange, the distance from the laminated rubber peripheral surface to the bolt is increased as described above, or the flange itself is made into a concave polygon, so that the portion other than the portion overlapping the laminated rubber. It is effective to make the bending rigidity of this part smaller than the bending rigidity of the part overlapping the laminated rubber.

  If the distance from the circumferential surface of the laminated rubber to the bolt is increased, as long as the portion that overlaps the laminated rubber remains bonded to the laminated rubber, the stiffness of the laminated rubber is added to the stiffness of that portion. If the flange itself is made a concave polygon and the part that overlaps the laminated rubber is placed at the center, the rigidity of the parts other than the part that overlaps the laminated rubber will be relatively greater. Therefore, in any case, the bending rigidity of the portion other than the portion overlapping with the laminated rubber becomes smaller than the bending rigidity of the portion overlapping with the laminated rubber, and the deformability is improved.

  Since the bending rigidity of the portion of the flange other than the portion overlapping with the laminated rubber is large enough to cause out-of-plane bending deformation by an axial tensile force that is smaller than the axial tensile force that would damage the laminated rubber, When a vertical upward displacement (lifting) occurs due to the relative horizontal displacement of the superstructure relative to the flange, the portion of the flange that overlaps the laminated rubber before the axial tensile force that would damage the laminated rubber acts on the laminated rubber Other parts exhibit resistance force according to the vertical displacement and cause bending deformation, so tensile force does not act on the laminated rubber, or even if it acts, the tensile force borne by the laminated rubber is reduced. The

  The part of the flange other than the part that overlaps the laminated rubber can be bent and deformed while bearing the bending moment due to the axial tensile force until bending yielding, and the upper structure can be lifted within the deformable range. Thus, a sufficient allowance for lifting and resistance to lifting are ensured, and at the same time, the action of tensile force on the laminated rubber accompanying lifting can be suppressed.

  If the part of the flange other than the part that overlaps the laminated rubber exerts a resistance according to the amount of lift of the superstructure, if the plastic deformation occurs, the flange will alleviate the impact when the superstructure lifts and sinks It will also serve as a buffer.

  It is not always necessary to reduce the bending rigidity of parts other than the part that overlaps with the laminated rubber by ensuring that the upper structure has a sufficient allowance for raising the upper structure by either one of the upper and lower flanges. If the bending rigidity of the portion other than the portion that overlaps the laminated rubber of both flanges is lowered, the allowable lifting amount is doubled as compared with the case of only one.

  As the portion of the flange other than the portion overlapping the laminated rubber is bent and deformed, the portion overlapping the laminated rubber may be bent and deformed. In this case, the upper and lower flanges as described in claim 2. Among them, at least one of the flanges to be bent and deformed is directly or indirectly overlapped with the laminated rubber, and the central part is joined to the laminated rubber, and the upper part or the lower structure is located in the periphery thereof. It is divided into a peripheral part that is relatively thin-walled from the central part, and the central part and the peripheral part are joined to each other so that they can be separated from each other. It is possible to concentrate the bending deformation on the peripheral portion which is a portion other than the portion overlapping with the rubber so that the bending deformation does not reach the central portion which is the portion overlapping with the laminated rubber.

  In this case, as shown in FIG. 3, the peripheral part joined to the upper structure or the lower structure is partially joined in the circumferential direction by bolts or the like to the central part joined to the laminated rubber, and the central part As shown in FIG. 4, when the axial tensile force is applied together with the shearing force to the laminated rubber support, bending deformation occurs in the peripheral portion of the relatively thin wall as shown in FIG. The possibility of bending deformation is low.

  In addition, the peripheral part is partially joined to the central part in the circumferential direction, and the central part and the peripheral part are separated. Even though these are joined, the influence of the bending deformation occurring in the peripheral portion does not reach the central portion, so that the bending deformation may occur in the portion overlapping with the laminated rubber and the damage to the laminated rubber associated therewith is avoided.

  Fig. 5 shows the relationship between the axial tensile force and deformation amount of the lower flange of the laminated rubber bearing shown in Fig. 4 with a thin line, and the relationship between the axial tensile force and deformation amount of the entire laminated rubber bearing including the laminated rubber and flange. Is indicated by a bold line. FIG. 4 shows a case where the lower flange is divided into a central portion and a peripheral portion.

  In the case of the conventional laminated rubber bearing indicated by the broken line, the laminated rubber is tensile yielded at an early stage as a result of direct tensile force acting on the laminated rubber, and soon breaks. In the invention according to claim 2, the lower flange As a result of the concentration of the deformation due to the tensile force on the periphery of the rubber, the deformation generated in the laminated rubber is small, so that the laminated rubber is kept healthy until the peripheral part of the flange yields.

  Since the peripheral portion is also separably joined to the central portion with a bolt or the like, the peripheral portion is plastically deformed as shown in FIG. 4, and when replacement is necessary, the peripheral portion can be easily separated from the central portion. It is possible to exchange. In this case, in order to limit the plasticizing region in the peripheral part or to increase the plastic deformation capacity of the peripheral part, the shape of the entire flange or the peripheral part is adjusted, or a hole or a groove is formed in a part of the peripheral part. It is also effective to form it.

  FIG. 3 (b) shows the plane of the laminated rubber bearing of the invention according to claim 2, but the peripheral part in the invention according to claim 2 does not necessarily have to be similar to the central part as shown here. There is no need for one part. FIG. 3 shows a case where a plurality of peripheral parts are joined to the central part so as to be separable, and the peripheral parts are combined to form a cruciform concave polygon.

  Also in the invention according to claim 2, since either one of the upper and lower flanges secures a sufficient allowance for lifting of the upper structure, both of the flanges are not necessarily thicker and thinner. However, when both flanges are divided into a central portion and a peripheral portion, a floating allowance twice as large as that in the case of only one is ensured.

  In the invention described in claim 3, as shown in FIG. 9- (a), the two laminated rubber bearings of the invention described in claim 2 are overlapped with each other, and the flanges composed of the central portion and the peripheral portion are overlapped with each other. The laminated rubber bearing is constructed by joining at the periphery thereof, thereby securing a floating allowance twice that of the invention of claim 2.

  In this case, the two laminated rubber bearings according to the second aspect of the invention are arranged in series, and at that time, the flanges located at the upper part and the lower part are joined to the upper structure and the lower structure, respectively.

  When opposing peripheral portions of the two laminated rubber bearings are joined to each other at the periphery thereof, when an axial tensile force acts on the laminated rubber bearing, both of the opposing flanges as shown in FIG. 9- (b). Since the central portion is separated and both peripheral portions are bent and deformed to follow the lifting of the superstructure, a lifting allowance twice as large as that of the laminated rubber bearing according to claim 2 is secured.

  In the first aspect of the invention, the bending rigidity of at least one of the upper and lower flanges other than the portion overlapping with the laminated rubber is smaller than the axial tensile force to the extent that the laminated rubber is damaged. By setting the size that can cause out-of-plane bending deformation due to force, when the superstructure is lifted, the axial tension force that can damage the laminated rubber is applied to the laminated rubber before it is laminated. Since a portion other than the portion overlapping with the rubber can bend and deform while exhibiting a resistance force corresponding to the vertical displacement, it is possible to eliminate or reduce the action of the tensile force on the laminated rubber.

  As a result, it is possible to suppress the action of the tensile force on the laminated rubber that accompanies the lifting while ensuring a sufficient lifting allowance of the upper structure and a resistance to the lifting.

  In the invention according to claim 2, at least one of the upper and lower flanges is positioned at the center portion where the flange is overlapped with the laminated rubber and joined to the laminated rubber, and the upper structure or the lower structure. It is divided into a peripheral part that is thinner than the central part, and the central part and the peripheral part are joined to each other so that they can be separated from each other. It is possible to concentrate the bending deformation on the peripheral portion which is a portion other than the portion overlapping with the rubber so that the bending deformation does not reach the central portion which is the portion overlapping with the laminated rubber. In particular, since the joint between the central part and the peripheral part is separated, the influence of the bending deformation that occurs in the peripheral part does not reach the central part. The accompanying damage to the laminated rubber is avoided.

  In addition, since the peripheral portion is separably joined to the central portion, the peripheral portion is plastically deformed, and when the replacement is necessary, it can be easily replaced by separating the peripheral portion from the central portion.

  In the invention described in claim 3, the two laminated rubber bearings of the invention described in claim 2 are arranged in series, and the opposing peripheral portions are joined to each other at the periphery thereof, whereby an axial tensile force acts on the laminated rubber bearing. Since the two peripheral portions sometimes bend and deform to follow the uplift of the superstructure, it is possible to ensure a lift up to twice that of the laminated rubber bearing according to the second aspect of the invention.

  As shown in FIGS. 1 and 2, the invention described in claim 1 comprises a laminated rubber 2 and flanges 3 and 4 that are integrated with the upper and lower parts thereof and joined to an upper structure 6 and a lower structure 7. Axial direction in which at least one of the flanges 3 (4) has a bending rigidity of a portion 3a (4a) other than a portion that directly or indirectly overlaps the laminated rubber 2 to the extent that the laminated rubber 2 is damaged. The laminated rubber bearing 1 is sized so as to be capable of causing out-of-plane bending deformation by an axial tensile force smaller than the tensile force.

  As shown in FIG. 1B, the laminated rubber bearing 1 is joined to the upper structure 6 directly or indirectly with a base plate or the like by a bolt 5 passing through the upper flange 3 and passes through the lower flange 4. The bolt 5 is joined directly to the lower structure 7 or indirectly with a base plate or the like interposed therebetween.

  The rigidity of the portion 3a (4a) of the flange 3 (4) other than the portion overlapping the laminated rubber 2 and the portion 3b (4b) overlapping the laminated rubber 2 are determined from the circumferential surface of the laminated rubber 2 of the flange 3 (4). The distance to the bolt 5 that joins the flange 3 (4) to the upper structure 6 (lower structure 7) should be more than half the width of the portion 3b (4b) that overlaps the laminated rubber 2, or the flange 3 (4) itself The bending rigidity of the portion 3a (4a) other than the portion that overlaps the laminated rubber 2 is made by making the shape of a concave polygon like a cross and placing the portion 3b (4b) that overlaps the laminated rubber 2 at the center. It is adjusted to be smaller than the bending rigidity of the portion 3b (4b) overlapping the laminated rubber 2.

  When the distance from the circumferential surface of the laminated rubber 2 to the bolt 5 is increased, the bending rigidity of the portion 3a (4a) other than the portion overlapping with the laminated rubber 2 can be reduced by itself. Since the shape is not limited, the flange 3 (4) is formed in a concave polygon as well as in a circular shape or a convex polygon.

  When the distance from the circumferential surface of the laminated rubber 2 to the bolt 5 is about half or more the width of the portion overlapping the laminated rubber 2, for example, the diameter of the laminated rubber 2 is 1500 mm (design long-term axial force is about 20000 kN). When the thickness of the flanges 3 and 4 is 50 mm, the distance from the peripheral surface of the laminated rubber 2 to the bolt 5 is usually about 100 mm (the outer diameter of the flange is 1900 mm). In order to give (4) the ability to bend and deform by tension of about 100 mm, it is appropriate to secure a distance from the peripheral surface of the laminated rubber 2 to the bolt 5 of about 500 to 1000 mm.

  The distance from the peripheral surface of the laminated rubber 2 to the bolt 5 is a range in which the flanges 3 and 4 can maintain the function of transmitting shearing force, bending moment, and axial tensile force between the upper structure 6 and the lower structure 7. However, the flange 3 (4) is different in shape depending on the shape of the flange 3 (4), for example, whether the flange 3 (4) is circular or square. The distance from the peripheral surface of the laminated rubber 2 to the bolt 5 is determined comprehensively, including the shape and thickness of the flange 3 (4). It is done.

  1 shows a type in which the upper and lower flanges 3 and 4 are directly overlapped and bonded to the upper and lower surfaces of the laminated rubber 2, and the distance from the circumferential surface of the laminated rubber 2 to the bolt 5 of both flanges 3 and 4 overlaps with the laminated rubber 2. FIG. 2 shows that the upper and lower flanges 3, 4 are not directly bonded to the upper and lower surfaces of the laminated rubber 2 but are directly bonded to the upper and lower surfaces of the laminated rubber 2. This is a case where the distance from the circumferential surface of the laminated rubber 2 to the bolt 5 of the lower flange 4 is about half the width of the portion overlapping the laminated rubber 2 in the type that is separably joined by a bolt or the like.

  FIG. 1 shows a case where the flange 3 (4) directly overlaps the laminated rubber 2, and FIG. 2 shows a case where the flange 3 (4) indirectly overlaps the laminated rubber 2. A portion 3b (4b) that overlaps the laminated rubber 2 may be disposed in the portion.

  FIG. 1- (b) shows a state in which the laminated rubber bearing 1 shown in FIG. 1 (a) bears an axial tensile force and a shearing force due to a horizontal displacement accompanied by lifting of the upper structure 6. As shown here, when the laminated rubber bearing 1 bears an axial tensile force and a shearing force, the laminated rubber 2 and the laminated rubber 2 are kept in a state where the portion 3b (4b) overlapping the laminated rubber 2 is adhered to the laminated rubber 2. The portion 3a (4a) other than the overlapping portion undergoes bending deformation to follow the horizontal displacement accompanied by the lifting of the upper structure 6.

  As shown in FIG. 3, the invention described in claim 2 comprises a laminated rubber 2 and upper and lower flanges 3 and 4 which are integrated with each other and joined to an upper structure 6 and a lower structure 7. , At least one of the flanges 4 (3) is directly or indirectly overlapped with the laminated rubber 2 and joined to the laminated rubber 2, and a central portion 41 (31), and the upper structure 6 and the lower portion A laminate that is joined to one of the structures 7 and is divided into a peripheral portion 42 (32) that is relatively thinner than the central portion, and the central portion 41 (31) and the peripheral portion 42 (32) are joined in a separable manner. Rubber bearing 1.

  The laminated rubber bearing 1 is joined to the upper structure 6 directly or indirectly with a base plate or the like by a bolt 5 penetrating the upper flange 3 as in the first aspect of the invention, and by a bolt 5 penetrating the lower flange 4. It is joined directly to the lower structure 7 or indirectly with a base plate or the like interposed therebetween.

  The central portion 41 (31) corresponds to the portion 4b (3b) overlapping the laminated rubber 2 in the first aspect of the invention, and the peripheral portion 42 (32) corresponds to the portion 4a (3a) other than the portion overlapping the laminated rubber 2. . In the second aspect of the invention, there are a type in which the upper and lower flanges 3 and 4 are directly bonded to the upper and lower surfaces of the laminated rubber 2 and a type in which the upper and lower surfaces are not directly bonded.

  3 and 4 show the case where the lower flange 4 is divided into the central portion 41 and the peripheral portion 42, the central portion 31 and the peripheral portion 32 do not appear in the drawings, but only the upper flange 3 is shown. In addition to the case where the center portion 31 and the peripheral portion 32 are divided, the upper and lower flanges 3 and 4 may be divided into the center portions 31 and 41 and the peripheral portions 32 and 42.

  In FIG. 3, the lower flange 4 is divided into one square central portion 41 and four rectangular peripheral portions 42, and the peripheral portion 42 is joined to the central portion 41 with bolts 8. The case where it becomes a cross-shaped concave polygon shape as a whole is shown.

  For example, as shown in FIG. 3, the peripheral portion 42 has a contact portion 42 a that abuts against the side surface of the relatively thick central portion 41, and the bolt 8 passes through the contact portion 42 a and is screwed into the central portion 41. To be joined to the central portion 41. The shape of the central portion 41 and the number and shape of the peripheral portions 42 are mainly determined by the cross-sectional shape of the laminated rubber 2. For example, even when the laminated rubber 2 has a circular cross section and the central portion 41 is circular, the contact portion 42a By forming the contact surface with the central portion 41 in a curved shape, the peripheral portion 42 can be joined to the central portion 41 as in the case of a square. When the laminated rubber 2 has a circular cross section, the central portion 41 is not necessarily circular, and may be square or polygonal.

  FIG. 6 shows a laminated rubber bearing 1A of a standard size comprising a laminated rubber 2 and upper and lower flanges 3A, 4A without changing the size and shape of the flanges 3A, 4A. The case where it uses as 1 is shown.

  In this case, in order to use the ready-made laminated rubber bearing 1A as the laminated rubber bearing 1 according to claim 2, with the upper and lower flanges 3A, 4A being bonded to the laminated rubber 2, at least one of For example, the center part 41 of the flange 4 composed of the center part 41 and the peripheral part 42 is overlapped on the lower flange 4A, and the flange 4A is joined to the flange 4 by the bolt 5 that passes through the flange 4A and is screwed into the center part 41. become. The upper flange 3A of the laminated rubber bearing 1A is used as the upper flange 3 of the laminated rubber bearing 1 as it is. FIG. 6 corresponds to the case where the flange 4 indirectly overlaps the laminated rubber 2.

  FIG. 7 shows an example of the shape of one peripheral portion 42 constituting the lower flange 4 shown in FIG. Reference numeral 42 b denotes a bolt hole for joining to the lower structure 7 with the bolt 5. (a) is a case where the peripheral portion 42 is formed in the basic shape used in FIG. In the case where the tensile strength of the portion is improved, (c) avoids plasticization at the formation position of the bolt hole 42b that becomes a cross-sectional defect in the joint portion to the central portion 41 and the joint portion to the lower structure 7. In this case, the shape is to prevent breakage.

  In the second aspect of the invention, the bending rigidity of the peripheral portion 42 only needs to be smaller than the bending rigidity of the central portion 41, and the entire flange 4 does not necessarily have a concave polygonal shape. There is also.

  FIG. 8 shows an example of joining the peripheral portion 42 and the central portion 41 with the bolts 8 other than FIG. (a) bends or curves the abutting portion 42a, while tilting or curving the portion of the central portion 41 that overlaps the abutting portion 42a, and screwing the bolt 8 into the central portion 41 from the abutting portion 42a side. In this case, (b) and (c) are cases where the entire peripheral portion 42 including the contact portion 42a is formed in a flat plate shape, and the contact portion 42a near the center portion 41 is overlapped and joined to the center portion 41. . (b) When the peripheral part 42 is arranged on the upper side of the central part 41, (c) is notched on the lower surface side around the central part 41, and the abutting part 42a is arranged on this notched part, and the central part 41 side In this case, the bolt 8 is screwed.

  FIG. 9 shows a case where the peripheral portion 42 is arranged at the corner portion of the square central portion 41 as a modified example of FIG. In this case, a contact portion 42a facing in two directions is formed at one corner of the peripheral portion 42, and the peripheral portion 42 is joined to the central portion 41 in two directions at the contact portion 42a.

  By joining each peripheral portion 42 to the central portion 41 in two directions, the tensile strength in the vertical direction of the peripheral portion 42, that is, the tensile strength as the laminated rubber bearing 1 is increased as compared with the case of FIG. It is conceivable that the difference in characteristics depending on the arrangement position of the peripheral portion 42 when the horizontal force acts in the diagonal direction of the central portion 41 becomes small. Here, in order to avoid a collision at the time of deformation of the peripheral portion 42, a gap is secured between the adjacent peripheral portions 42, 42, but this is not always necessary.

  As shown in FIG. 10- (a), the invention according to claim 3 comprises the two laminated rubber bearings 1 and 1 according to the invention according to claim 2 comprising a central portion 41 (31) and a peripheral portion 42 (32). This is a laminated rubber bearing 10 configured such that each flange 4 (3) is overlapped with each other and both peripheral portions 42 (32) and 42 (32) are joined in the periphery.

  In FIG. 10- (a), since the laminated rubber bearing 10 is composed of two laminated rubber bearings 1 and 1 in which only the lower flange 4 shown in FIG. 3 is divided into a central portion 41 and a peripheral portion 42, respectively. The laminated rubber bearings 1 and 1 in which both the upper and lower flanges 3 and 4 are divided into the center portions 31 and 41 and the peripheral portions 32 and 42 may be overlapped.

  As shown in FIG. 10- (b), the laminated rubber support 10 is joined to the upper structure 6 at the upper flange 3 when the two laminated rubber supports 1, 1 are stacked, and the lower flange 3 is located. The flanges 4 and 4 which are joined to the lower structure 7 and overlap each other are not joined to the upper structure 6 and the lower structure 7.

  FIG. 10- (a) shows a case where the two laminated rubber supports 1 and 1 shown in FIG. 3 are stacked, and the peripheral portions 42 and 42 which are overlapped with each other are connected by bolts 9 penetrating them. Since the peripheral portion 42 is detachably joined to the central portion 41 with bolts 8 or the like, when the peripheral portion 42 is plastically deformed and it becomes necessary to replace the peripheral portion 42, only the peripheral portion 42 is centered 41. Therefore, it is not always necessary to join the overlapping peripheral portions 42 and 42 with the bolt 9, and the peripheral portions 42 and 42 that are integrated can be separated from the central portion 41 even if they are joined by welding. .

  FIG. 10- (b) shows the deformation state of each laminated rubber 2 and 2 when an axial tensile force as well as a shearing force is applied to the laminated rubber support 10. As shown here, the laminated rubber support 10 has an opposing flange. Both the central portions 41 and 41 of 4 and 4 are separated, and the peripheral portions 42 and 42 are bent and deformed to follow the rising of the upper structure 6.

(a) is an elevation view showing an example of the laminated rubber bearing of the invention described in claim 1, and (b) is a state when axial tensile force and shearing force are applied to the laminated rubber bearing of (a). FIG. It is the elevation which showed the example of the other laminated rubber bearing of the invention of Claim 1. (a) is an elevation view showing an example of a laminated rubber bearing according to the invention described in claim 2, and (b) is a plan view of (a). FIG. 4 is an elevational view showing a state when an axial tensile force and a shearing force act on the laminated rubber bearing shown in FIG. 3. FIG. 4 is a graph showing the relationship between the axial tensile force and tensile deformation of the laminated rubber bearing shown in FIG. 3. FIG. 5 is an elevational view showing a case where a standard size laminated rubber bearing is used as the laminated rubber bearing of the second aspect of the invention. It is the top view which showed the example of the shape of one peripheral part which comprises the lower flange shown to FIG. 3- (b). (a)-(c) is sectional drawing which showed the example of joining by the volt | bolt of a peripheral part and center parts other than FIG. It is the top view which showed the modification of FIG. (a) is an elevation view showing an example of the laminated rubber bearing of the invention described in claim 3, and (b) is a state when axial tensile force and shearing force are applied to the laminated rubber bearing of (a). FIG.

Explanation of symbols

1 ... Laminated rubber support, 2 ... Laminated rubber, 2a, 2b ... Inner flange,
3 …… Upper flange, 3a …… Parts other than the part overlapping the laminated rubber, 3b …… Parts overlapping the laminated rubber,
4 …… Lower flange, 4a …… Parts other than the part overlapping the laminated rubber, 4b …… Parts overlapping the laminated rubber, 41 …… Center part, 42 …… Peripheral part, 42a …… Abutting part, 42b …… Bolt holes,
1A …… Standard size laminated rubber bearing, 3A …… Upper flange, 4A …… Lower flange,
5 ... Bolt (3-6, 4-7), 6 ... Upper structure, 7 ... Lower structure,
8 ... Bolt (42-41), 9 ... Bolt (42-42),
10 …… Laminated rubber bearing (Claim 3).

Claims (3)

  In a laminated rubber bearing consisting of a laminated rubber and a flange that is integrated above and below and joined to the upper structure and the lower structure, at least one of the upper and lower flanges directly or indirectly overlaps the laminated rubber A laminated rubber bearing, characterized in that a bending rigidity of a portion other than the portion is set to a magnitude capable of causing an out-of-plane bending deformation by an axial tensile force smaller than an axial tensile force that damages the laminated rubber.   In a laminated rubber bearing consisting of a laminated rubber and a flange that is integrated above and below and joined to the upper structure and the lower structure, at least one of the upper and lower flanges directly or indirectly overlaps the laminated rubber. It is divided into a central part that is bonded to the laminated rubber, and a peripheral part that is located in the periphery of the rubber and is relatively thinner than the central part, and is connected to either the upper structure or the lower structure. Laminated rubber bearing characterized by being separably joined to each other. 3. A laminated rubber bearing according to claim 2, wherein the two laminated rubber bearings are constructed by superimposing flanges each having a central portion and a peripheral portion, and joining the peripheral portions at the periphery thereof.

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